aboutsummaryrefslogtreecommitdiff
path: root/gold/s390.cc
blob: c496018200183aa86ff7dd807c07585d2a34df2e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
// s390.cc -- s390 target support for gold.

// Copyright (C) 2015-2016 Free Software Foundation, Inc.
// Written by Marcin Kościelnicki <koriakin@0x04.net>.

// This file is part of gold.

// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.

#include "gold.h"

#include <cstring>

#include "elfcpp.h"
#include "dwarf.h"
#include "parameters.h"
#include "reloc.h"
#include "s390.h"
#include "object.h"
#include "symtab.h"
#include "layout.h"
#include "output.h"
#include "copy-relocs.h"
#include "target.h"
#include "target-reloc.h"
#include "target-select.h"
#include "tls.h"
#include "gc.h"
#include "icf.h"

namespace
{

using namespace gold;

// A class to handle the .got.plt section.

template<int size>
class Output_data_got_plt_s390 : public Output_section_data_build
{
 public:
  Output_data_got_plt_s390(Layout* layout)
    : Output_section_data_build(size/8),
      layout_(layout)
  { }

  Output_data_got_plt_s390(Layout* layout, off_t data_size)
    : Output_section_data_build(data_size, size/8),
      layout_(layout)
  { }

 protected:
  // Write out the PLT data.
  void
  do_write(Output_file*);

  // Write to a map file.
  void
  do_print_to_mapfile(Mapfile* mapfile) const
  { mapfile->print_output_data(this, "** GOT PLT"); }

 private:
  // A pointer to the Layout class, so that we can find the .dynamic
  // section when we write out the GOT PLT section.
  Layout* layout_;
};

// A class to handle the PLT data.

template<int size>
class Output_data_plt_s390 : public Output_section_data
{
 public:
  typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, true>
    Reloc_section;

  Output_data_plt_s390(Layout* layout,
                         Output_data_got<size, true>* got,
                         Output_data_got_plt_s390<size>* got_plt,
                         Output_data_space* got_irelative)
    : Output_section_data(4), layout_(layout),
      irelative_rel_(NULL), got_(got), got_plt_(got_plt),
      got_irelative_(got_irelative), count_(0),
      irelative_count_(0), free_list_()
  { this->init(layout); }

  Output_data_plt_s390(Layout* layout,
                         Output_data_got<size, true>* got,
                         Output_data_got_plt_s390<size>* got_plt,
                         Output_data_space* got_irelative,
                         unsigned int plt_count)
    : Output_section_data((plt_count + 1) * plt_entry_size,
                          4, false),
      layout_(layout), irelative_rel_(NULL), got_(got),
      got_plt_(got_plt), got_irelative_(got_irelative), count_(plt_count),
      irelative_count_(0), free_list_()
  {
    this->init(layout);

    // Initialize the free list and reserve the first entry.
    this->free_list_.init((plt_count + 1) * plt_entry_size, false);
    this->free_list_.remove(0, plt_entry_size);
  }

  // Initialize the PLT section.
  void
  init(Layout* layout);

  // Add an entry to the PLT.
  void
  add_entry(Symbol_table*, Layout*, Symbol* gsym);

  // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
  unsigned int
  add_local_ifunc_entry(Symbol_table*, Layout*,
    Sized_relobj_file<size, true>*, unsigned int);

  // Add the relocation for a PLT entry.
  void
  add_relocation(Symbol_table*, Layout*, Symbol*, unsigned int);

  // Return the .rela.plt section data.
  Reloc_section*
  rela_plt()
  { return this->rel_; }

  // Return where the IRELATIVE relocations should go in the PLT
  // relocations.
  Reloc_section*
  rela_irelative(Symbol_table*, Layout*);

  // Return whether we created a section for IRELATIVE relocations.
  bool
  has_irelative_section() const
  { return this->irelative_rel_ != NULL; }

  // Return the number of PLT entries.
  unsigned int
  entry_count() const
  { return this->count_ + this->irelative_count_; }

  // Return the offset of the first non-reserved PLT entry.
  unsigned int
  first_plt_entry_offset()
  { return plt_entry_size; }

  // Return the size of a PLT entry.
  unsigned int
  get_plt_entry_size() const
  { return plt_entry_size; }

  // Reserve a slot in the PLT for an existing symbol in an incremental update.
  void
  reserve_slot(unsigned int plt_index)
  {
    this->free_list_.remove((plt_index + 1) * plt_entry_size,
                            (plt_index + 2) * plt_entry_size);
  }

  // Return the PLT address to use for a global symbol.
  uint64_t
  address_for_global(const Symbol*);

  // Return the PLT address to use for a local symbol.
  uint64_t
  address_for_local(const Relobj*, unsigned int symndx);

  // Add .eh_frame information for the PLT.
  void
  add_eh_frame(Layout* layout)
  {
	  (void)layout;
    layout->add_eh_frame_for_plt(this,
				 plt_eh_frame_cie,
				 plt_eh_frame_cie_size,
				 plt_eh_frame_fde,
				 plt_eh_frame_fde_size);
  }

 protected:
  // Fill in the first PLT entry.
  void
  fill_first_plt_entry(unsigned char* pov,
		       typename elfcpp::Elf_types<size>::Elf_Addr got_address,
		       typename elfcpp::Elf_types<size>::Elf_Addr plt_address);

  // Fill in a normal PLT entry.  Returns the offset into the entry that
  // should be the initial GOT slot value.
  unsigned int
  fill_plt_entry(unsigned char* pov,
		 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
		 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
		 unsigned int got_offset,
		 unsigned int plt_offset,
		 unsigned int plt_rel_offset);

  void
  do_adjust_output_section(Output_section* os);

  // Write to a map file.
  void
  do_print_to_mapfile(Mapfile* mapfile) const
  { mapfile->print_output_data(this, _("** PLT")); }

 private:
  // Set the final size.
  void
  set_final_data_size();

  // Write out the PLT data.
  void
  do_write(Output_file*);

  // A pointer to the Layout class, so that we can find the .dynamic
  // section when we write out the GOT PLT section.
  Layout* layout_;
  // The reloc section.
  Reloc_section* rel_;
  // The IRELATIVE relocs, if necessary.  These must follow the
  // regular PLT relocations.
  Reloc_section* irelative_rel_;
  // The .got section.
  Output_data_got<size, true>* got_;
  // The .got.plt section.
  Output_data_got_plt_s390<size>* got_plt_;
  // The part of the .got.plt section used for IRELATIVE relocs.
  Output_data_space* got_irelative_;
  // The number of PLT entries.
  unsigned int count_;
  // Number of PLT entries with R_TILEGX_IRELATIVE relocs.  These
  // follow the regular PLT entries.
  unsigned int irelative_count_;
  // List of available regions within the section, for incremental
  // update links.
  Free_list free_list_;

  // The size of an entry in the PLT.
  static const int plt_entry_size = 0x20;
  // The first entry in the PLT.
  static const unsigned char first_plt_entry_32_abs[plt_entry_size];
  static const unsigned char first_plt_entry_32_pic[plt_entry_size];
  static const unsigned char first_plt_entry_64[plt_entry_size];
  // Other entries in the PLT for an executable.
  static const unsigned char plt_entry_32_abs[plt_entry_size];
  static const unsigned char plt_entry_32_pic12[plt_entry_size];
  static const unsigned char plt_entry_32_pic16[plt_entry_size];
  static const unsigned char plt_entry_32_pic[plt_entry_size];
  static const unsigned char plt_entry_64[plt_entry_size];

  // The .eh_frame unwind information for the PLT.
  static const int plt_eh_frame_cie_size = 12;
  static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size];
  static const int plt_eh_frame_fde_size = 12;
  static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
};


template<int size>
class Target_s390 : public Sized_target<size, true>
{
 public:
  typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, true> Reloc_section;

  Target_s390()
    : Sized_target<size, true>(&s390_info),
      got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),
      global_offset_table_(NULL), rela_dyn_(NULL),
      rela_irelative_(NULL), copy_relocs_(elfcpp::R_390_COPY),
      got_mod_index_offset_(-1U), tls_base_symbol_defined_(false),
      layout_(NULL)
  { }

  // Scan the relocations to look for symbol adjustments.
  void
  gc_process_relocs(Symbol_table* symtab,
		    Layout* layout,
		    Sized_relobj_file<size, true>* object,
		    unsigned int data_shndx,
		    unsigned int sh_type,
		    const unsigned char* prelocs,
		    size_t reloc_count,
		    Output_section* output_section,
		    bool needs_special_offset_handling,
		    size_t local_symbol_count,
		    const unsigned char* plocal_symbols);

  // Scan the relocations to look for symbol adjustments.
  void
  scan_relocs(Symbol_table* symtab,
	      Layout* layout,
	      Sized_relobj_file<size, true>* object,
	      unsigned int data_shndx,
	      unsigned int sh_type,
	      const unsigned char* prelocs,
	      size_t reloc_count,
	      Output_section* output_section,
	      bool needs_special_offset_handling,
	      size_t local_symbol_count,
	      const unsigned char* plocal_symbols);

  // Finalize the sections.
  void
  do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);

  // Return the value to use for a dynamic which requires special
  // treatment.
  uint64_t
  do_dynsym_value(const Symbol*) const;

  // Relocate a section.
  void
  relocate_section(const Relocate_info<size, true>*,
		   unsigned int sh_type,
		   const unsigned char* prelocs,
		   size_t reloc_count,
		   Output_section* output_section,
		   bool needs_special_offset_handling,
		   unsigned char* view,
		   typename elfcpp::Elf_types<size>::Elf_Addr view_address,
		   section_size_type view_size,
		   const Reloc_symbol_changes*);

  // Scan the relocs during a relocatable link.
  void
  scan_relocatable_relocs(Symbol_table* symtab,
			  Layout* layout,
			  Sized_relobj_file<size, true>* object,
			  unsigned int data_shndx,
			  unsigned int sh_type,
			  const unsigned char* prelocs,
			  size_t reloc_count,
			  Output_section* output_section,
			  bool needs_special_offset_handling,
			  size_t local_symbol_count,
			  const unsigned char* plocal_symbols,
			  Relocatable_relocs*);

  // Scan the relocs for --emit-relocs.
  void
  emit_relocs_scan(Symbol_table* symtab,
		   Layout* layout,
		   Sized_relobj_file<size, true>* object,
		   unsigned int data_shndx,
		   unsigned int sh_type,
		   const unsigned char* prelocs,
		   size_t reloc_count,
		   Output_section* output_section,
		   bool needs_special_offset_handling,
		   size_t local_symbol_count,
		   const unsigned char* plocal_syms,
		   Relocatable_relocs* rr);

  // Return a string used to fill a code section with nops.
  std::string
  do_code_fill(section_size_type length) const;

  // Emit relocations for a section.
  void
  relocate_relocs(
      const Relocate_info<size, true>*,
      unsigned int sh_type,
      const unsigned char* prelocs,
      size_t reloc_count,
      Output_section* output_section,
      typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
      unsigned char* view,
      typename elfcpp::Elf_types<size>::Elf_Addr view_address,
      section_size_type view_size,
      unsigned char* reloc_view,
      section_size_type reloc_view_size);

  // Return whether SYM is defined by the ABI.
  bool
  do_is_defined_by_abi(const Symbol* sym) const
  { return strcmp(sym->name(), "__tls_get_offset") == 0; }

  // Return the PLT address to use for a global symbol.
  uint64_t
  do_plt_address_for_global(const Symbol* gsym) const
  { return this->plt_section()->address_for_global(gsym); }

  uint64_t
  do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const
  { return this->plt_section()->address_for_local(relobj, symndx); }

  // Return the offset to use for the GOT_INDX'th got entry which is
  // for a local tls symbol specified by OBJECT, SYMNDX.
  int64_t
  do_tls_offset_for_local(const Relobj* object,
			  unsigned int symndx,
			  unsigned int got_indx) const;

  // Return the offset to use for the GOT_INDX'th got entry which is
  // for global tls symbol GSYM.
  int64_t
  do_tls_offset_for_global(Symbol* gsym, unsigned int got_indx) const;

  // This function should be defined in targets that can use relocation
  // types to determine (implemented in local_reloc_may_be_function_pointer
  // and global_reloc_may_be_function_pointer)
  // if a function's pointer is taken.  ICF uses this in safe mode to only
  // fold those functions whose pointer is defintely not taken.
  bool
  do_can_check_for_function_pointers() const
  { return true; }

  // Return whether SYM is call to a non-split function.
  bool
  do_is_call_to_non_split(const Symbol* sym, const unsigned char* preloc,
			  const unsigned char* view,
			  section_size_type view_size) const;

  // Adjust -fsplit-stack code which calls non-split-stack code.
  void
  do_calls_non_split(Relobj* object, unsigned int shndx,
		     section_offset_type fnoffset, section_size_type fnsize,
		     const unsigned char* prelocs, size_t reloc_count,
		     unsigned char* view, section_size_type view_size,
		     std::string* from, std::string* to) const;

  // Return the size of the GOT section.
  section_size_type
  got_size() const
  {
    gold_assert(this->got_ != NULL);
    return this->got_->data_size();
  }

  // Return the number of entries in the GOT.
  unsigned int
  got_entry_count() const
  {
    if (this->got_ == NULL)
      return 0;
    return this->got_size() / (size / 8);
  }

  // Return the number of entries in the PLT.
  unsigned int
  plt_entry_count() const;

  // Return the offset of the first non-reserved PLT entry.
  unsigned int
  first_plt_entry_offset() const;

  // Return the size of each PLT entry.
  unsigned int
  plt_entry_size() const;

  // Create the GOT section for an incremental update.
  Output_data_got_base*
  init_got_plt_for_update(Symbol_table* symtab,
			  Layout* layout,
			  unsigned int got_count,
			  unsigned int plt_count);

  // Reserve a GOT entry for a local symbol, and regenerate any
  // necessary dynamic relocations.
  void
  reserve_local_got_entry(unsigned int got_index,
			  Sized_relobj<size, true>* obj,
			  unsigned int r_sym,
			  unsigned int got_type);

  // Reserve a GOT entry for a global symbol, and regenerate any
  // necessary dynamic relocations.
  void
  reserve_global_got_entry(unsigned int got_index, Symbol* gsym,
			   unsigned int got_type);

  // Register an existing PLT entry for a global symbol.
  void
  register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index,
			    Symbol* gsym);

  // Force a COPY relocation for a given symbol.
  void
  emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t);

  // Apply an incremental relocation.
  void
  apply_relocation(const Relocate_info<size, true>* relinfo,
		   typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
		   unsigned int r_type,
		   typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
		   const Symbol* gsym,
		   unsigned char* view,
		   typename elfcpp::Elf_types<size>::Elf_Addr address,
		   section_size_type view_size);

 private:

  // The class which scans relocations.
  class Scan
  {
  public:
    Scan()
      : issued_non_pic_error_(false)
    { }

    static inline int
    get_reference_flags(unsigned int r_type);

    inline void
    local(Symbol_table* symtab, Layout* layout, Target_s390* target,
	  Sized_relobj_file<size, true>* object,
	  unsigned int data_shndx,
	  Output_section* output_section,
	  const elfcpp::Rela<size, true>& reloc, unsigned int r_type,
	  const elfcpp::Sym<size, true>& lsym,
	  bool is_discarded);

    inline void
    global(Symbol_table* symtab, Layout* layout, Target_s390* target,
	   Sized_relobj_file<size, true>* object,
	   unsigned int data_shndx,
	   Output_section* output_section,
	   const elfcpp::Rela<size, true>& reloc, unsigned int r_type,
	   Symbol* gsym);

    inline bool
    local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
					Target_s390* target,
					Sized_relobj_file<size, true>* object,
					unsigned int data_shndx,
					Output_section* output_section,
					const elfcpp::Rela<size, true>& reloc,
					unsigned int r_type,
					const elfcpp::Sym<size, true>& lsym);

    inline bool
    global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
					 Target_s390* target,
					 Sized_relobj_file<size, true>* object,
					 unsigned int data_shndx,
					 Output_section* output_section,
					 const elfcpp::Rela<size, true>& reloc,
					 unsigned int r_type,
					 Symbol* gsym);

  private:
    static void
    unsupported_reloc_local(Sized_relobj_file<size, true>*,
			    unsigned int r_type);

    static void
    unsupported_reloc_global(Sized_relobj_file<size, true>*,
			     unsigned int r_type, Symbol*);

    void
    check_non_pic(Relobj*, unsigned int r_type);

    inline bool
    possible_function_pointer_reloc(unsigned int r_type);

    bool
    reloc_needs_plt_for_ifunc(Sized_relobj_file<size, true>*,
			      unsigned int r_type);

    // Whether we have issued an error about a non-PIC compilation.
    bool issued_non_pic_error_;
  };

  // The class which implements relocation.
  class Relocate
  {
   public:
    // Do a relocation.  Return false if the caller should not issue
    // any warnings about this relocation.
    inline bool
    relocate(const Relocate_info<size, true>*, unsigned int,
	     Target_s390*, Output_section*, size_t, const unsigned char*,
	     const Sized_symbol<size>*, const Symbol_value<size>*,
	     unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
	     section_size_type);

   private:
    // Do a TLS relocation.
    inline typename elfcpp::Elf_types<size>::Elf_Addr
    relocate_tls(const Relocate_info<size, true>*, Target_s390*,
		 size_t relnum, const elfcpp::Rela<size, true>&,
		 unsigned int r_type, const Sized_symbol<size>*,
		 const Symbol_value<size>*,
		 unsigned char*, section_size_type);

    // Do a TLS General-Dynamic to Initial-Exec transition.
    inline void
    tls_gd_to_ie(const Relocate_info<size, true>*, size_t relnum,
		 const elfcpp::Rela<size, true>&,
		 unsigned char* view,
		 section_size_type view_size);

    // Do a TLS General-Dynamic to Local-Exec transition.
    inline void
    tls_gd_to_le(const Relocate_info<size, true>*, size_t relnum,
		 const elfcpp::Rela<size, true>&,
		 unsigned char* view,
		 section_size_type view_size);

    // Do a TLS Local-Dynamic to Local-Exec transition.
    inline void
    tls_ld_to_le(const Relocate_info<size, true>*, size_t relnum,
		 const elfcpp::Rela<size, true>&,
		 unsigned char* view,
		 section_size_type view_size);

    // Do a TLS Initial-Exec to Local-Exec transition.
    static inline void
    tls_ie_to_le(const Relocate_info<size, true>*, size_t relnum,
		 const elfcpp::Rela<size, true>&,
		 unsigned char* view,
		 section_size_type view_size);
  };

  // Adjust TLS relocation type based on the options and whether this
  // is a local symbol.
  static tls::Tls_optimization
  optimize_tls_reloc(bool is_final, int r_type);

  // Get the GOT section.
  const Output_data_got<size, true>*
  got_section() const
  {
    gold_assert(this->got_ != NULL);
    return this->got_;
  }

  // Get the GOT section, creating it if necessary.
  Output_data_got<size, true>*
  got_section(Symbol_table*, Layout*);

  typename elfcpp::Elf_types<size>::Elf_Addr
  got_address() const
  {
    gold_assert(this->got_ != NULL);
    return this->got_plt_->address();
  }

  typename elfcpp::Elf_types<size>::Elf_Addr
  got_main_offset() const
  {
    gold_assert(this->got_ != NULL);
    return this->got_->address() - this->got_address();
  }

  // Create the PLT section.
  void
  make_plt_section(Symbol_table* symtab, Layout* layout);

  // Create a PLT entry for a global symbol.
  void
  make_plt_entry(Symbol_table*, Layout*, Symbol*);

  // Create a PLT entry for a local STT_GNU_IFUNC symbol.
  void
  make_local_ifunc_plt_entry(Symbol_table*, Layout*,
			     Sized_relobj_file<size, true>* relobj,
			     unsigned int local_sym_index);

  // Create a GOT entry for the TLS module index.
  unsigned int
  got_mod_index_entry(Symbol_table* symtab, Layout* layout,
		      Sized_relobj_file<size, true>* object);

  // Get the PLT section.
  Output_data_plt_s390<size>*
  plt_section() const
  {
    gold_assert(this->plt_ != NULL);
    return this->plt_;
  }

  // Get the dynamic reloc section, creating it if necessary.
  Reloc_section*
  rela_dyn_section(Layout*);

  // Get the section to use for IRELATIVE relocations.
  Reloc_section*
  rela_irelative_section(Layout*);

  // Add a potential copy relocation.
  void
  copy_reloc(Symbol_table* symtab, Layout* layout,
	     Sized_relobj_file<size, true>* object,
	     unsigned int shndx, Output_section* output_section,
	     Symbol* sym, const elfcpp::Rela<size, true>& reloc)
  {
    unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info());
    this->copy_relocs_.copy_reloc(symtab, layout,
				  symtab->get_sized_symbol<size>(sym),
				  object, shndx, output_section,
				  r_type, reloc.get_r_offset(),
				  reloc.get_r_addend(),
				  this->rela_dyn_section(layout));
  }

  // A function for targets to call.  Return whether BYTES/LEN matches
  // VIEW/VIEW_SIZE at OFFSET.  Like the one in Target, but takes
  // an unsigned char * parameter.
  bool
  match_view_u(const unsigned char* view, section_size_type view_size,
     section_offset_type offset, const unsigned char* bytes, size_t len) const
    {
      return this->match_view(view, view_size, offset,
			      reinterpret_cast<const char*>(bytes), len);
    }

  // Information about this specific target which we pass to the
  // general Target structure.
  static Target::Target_info s390_info;

  // The types of GOT entries needed for this platform.
  // These values are exposed to the ABI in an incremental link.
  // Do not renumber existing values without changing the version
  // number of the .gnu_incremental_inputs section.
  enum Got_type
  {
    GOT_TYPE_STANDARD = 0,      // GOT entry for a regular symbol
    GOT_TYPE_TLS_OFFSET = 1,    // GOT entry for TLS offset
    GOT_TYPE_TLS_PAIR = 2,      // GOT entry for TLS module/offset pair
  };

  // The GOT section.
  Output_data_got<size, true>* got_;
  // The PLT section.
  Output_data_plt_s390<size>* plt_;
  // The GOT PLT section.
  Output_data_got_plt_s390<size>* got_plt_;
  // The GOT section for IRELATIVE relocations.
  Output_data_space* got_irelative_;
  // The _GLOBAL_OFFSET_TABLE_ symbol.
  Symbol* global_offset_table_;
  // The dynamic reloc section.
  Reloc_section* rela_dyn_;
  // The section to use for IRELATIVE relocs.
  Reloc_section* rela_irelative_;
  // Relocs saved to avoid a COPY reloc.
  Copy_relocs<elfcpp::SHT_RELA, size, true> copy_relocs_;
  // Offset of the GOT entry for the TLS module index.
  unsigned int got_mod_index_offset_;
  // True if the _TLS_MODULE_BASE_ symbol has been defined.
  bool tls_base_symbol_defined_;
  // For use in do_tls_offset_for_*
  Layout *layout_;

  // Code sequences for -fsplit-stack matching.
  static const unsigned char ss_code_bras_8[];
  static const unsigned char ss_code_l_basr[];
  static const unsigned char ss_code_a_basr[];
  static const unsigned char ss_code_larl[];
  static const unsigned char ss_code_brasl[];
  static const unsigned char ss_code_jg[];
  static const unsigned char ss_code_jgl[];

  // Variable code sequence matchers for -fsplit-stack.
  bool ss_match_st_r14(unsigned char* view,
		       section_size_type view_size,
		       section_offset_type *offset) const;
  bool ss_match_l_r14(unsigned char* view,
		      section_size_type view_size,
		      section_offset_type *offset) const;
  bool ss_match_mcount(unsigned char* view,
		       section_size_type view_size,
		       section_offset_type *offset) const;
  bool ss_match_ear(unsigned char* view,
		    section_size_type view_size,
		    section_offset_type *offset) const;
  bool ss_match_c(unsigned char* view,
		  section_size_type view_size,
		  section_offset_type *offset) const;
  bool ss_match_l(unsigned char* view,
		  section_size_type view_size,
		  section_offset_type *offset,
		  int *guard_reg) const;
  bool ss_match_ahi(unsigned char* view,
		    section_size_type view_size,
		    section_offset_type *offset,
		    int guard_reg,
		    uint32_t *arg) const;
  bool ss_match_alfi(unsigned char* view,
		     section_size_type view_size,
		     section_offset_type *offset,
		     int guard_reg,
		     uint32_t *arg) const;
  bool ss_match_cr(unsigned char* view,
		   section_size_type view_size,
		   section_offset_type *offset,
		   int guard_reg) const;
};

template<>
Target::Target_info Target_s390<32>::s390_info =
{
  32,			// size
  true,			// is_big_endian
  elfcpp::EM_S390,	// machine_code
  false,		// has_make_symbol
  false,		// has_resolve
  true,			// has_code_fill
  true,			// is_default_stack_executable
  true,			// can_icf_inline_merge_sections
  '\0',			// wrap_char
  "/lib/ld.so.1",	// dynamic_linker
  0x00400000,		// default_text_segment_address
  4 * 1024,		// abi_pagesize (overridable by -z max-page-size)
  4 * 1024,		// common_pagesize (overridable by -z common-page-size)
  false,                // isolate_execinstr
  0,                    // rosegment_gap
  elfcpp::SHN_UNDEF,	// small_common_shndx
  elfcpp::SHN_UNDEF,	// large_common_shndx
  0,			// small_common_section_flags
  0,			// large_common_section_flags
  NULL,			// attributes_section
  NULL,			// attributes_vendor
  "_start",		// entry_symbol_name
  32,			// hash_entry_size
};

template<>
Target::Target_info Target_s390<64>::s390_info =
{
  64,			// size
  true,			// is_big_endian
  elfcpp::EM_S390,	// machine_code
  false,		// has_make_symbol
  false,		// has_resolve
  true,			// has_code_fill
  true,			// is_default_stack_executable
  true,			// can_icf_inline_merge_sections
  '\0',			// wrap_char
  "/lib/ld64.so.1",	// dynamic_linker
  0x80000000ll,		// default_text_segment_address
  4 * 1024,		// abi_pagesize (overridable by -z max-page-size)
  4 * 1024,		// common_pagesize (overridable by -z common-page-size)
  false,                // isolate_execinstr
  0,                    // rosegment_gap
  elfcpp::SHN_UNDEF,	// small_common_shndx
  elfcpp::SHN_UNDEF,	// large_common_shndx
  0,			// small_common_section_flags
  0,			// large_common_section_flags
  NULL,			// attributes_section
  NULL,			// attributes_vendor
  "_start",		// entry_symbol_name
  64,			// hash_entry_size
};

template<int size>
class S390_relocate_functions
{
public:
  enum Overflow_check
  {
    CHECK_NONE,
    CHECK_SIGNED,
    CHECK_UNSIGNED,
    CHECK_BITFIELD,
    CHECK_LOW_INSN,
    CHECK_HIGH_INSN
  };

  enum Status
  {
    STATUS_OK,
    STATUS_OVERFLOW
  };

private:
  typedef S390_relocate_functions<size> This;
  typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;

  template<int valsize>
  static inline bool
  has_overflow_signed(Address value)
  {
    // limit = 1 << (valsize - 1) without shift count exceeding size of type
    Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1);
    limit <<= ((valsize - 1) >> 1);
    limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1));
    return value + limit > (limit << 1) - 1;
  }

  template<int valsize>
  static inline bool
  has_overflow_unsigned(Address value)
  {
    Address limit = static_cast<Address>(1) << ((valsize - 1) >> 1);
    limit <<= ((valsize - 1) >> 1);
    limit <<= ((valsize - 1) - 2 * ((valsize - 1) >> 1));
    return value > (limit << 1) - 1;
  }

  template<int fieldsize>
  static inline void
  rela(unsigned char* view, Address mask, Address value)
  {
    typedef typename elfcpp::Swap<fieldsize, true>::Valtype Valtype;
    Valtype* wv = reinterpret_cast<Valtype*>(view);
    Valtype val = elfcpp::Swap<fieldsize, true>::readval(view);
    val &= ~mask;
    value &= mask;
    elfcpp::Swap<fieldsize, true>::writeval(wv, val | value);
  }

public:
  // R_390_12, R_390_GOT12, R_390_GOTPLT12, R_390_GOTIE12
  static inline Status
  rela12(unsigned char* view, Address value)
  {
    if (This::template has_overflow_unsigned<12>(value))
      return STATUS_OVERFLOW;
    This::template rela<16>(view, 0x0fff, value);
    return STATUS_OK;
  }

  // R_390_16, R_390_GOT16, R_390_GOTPLT16, R_390_GOTOFF16, R_390_PLTOFF16
  static inline Status
  rela16(unsigned char* view, Address value)
  {
    if (This::template has_overflow_signed<16>(value))
      return STATUS_OVERFLOW;
    This::template rela<16>(view, 0xffff, value);
    return STATUS_OK;
  }

  // R_390_20, R_390_GOT20, R_390_GOTPLT20, R_390_GOTIE20
  static inline Status
  rela20(unsigned char* view, Address value)
  {
    if (This::template has_overflow_signed<20>(value))
      return STATUS_OVERFLOW;
    This::template rela<16>(view, 0x0fff, value);
    This::template rela<16>(view + 2, 0xff00, value >> (12 - 8));
    return STATUS_OK;
  }

  // R_390_PC12DBL, R_390_PLT12DBL
  static inline Status
  pcrela12dbl(unsigned char* view, Address value, Address address)
  {
    value -= address;
    if ((value & 1) != 0)
      return STATUS_OVERFLOW;
    if (This::template has_overflow_signed<13>(value))
      return STATUS_OVERFLOW;
    value >>= 1;
    This::template rela<16>(view, 0x0fff, value);
    return STATUS_OK;
  }

  // R_390_PC16DBL, R_390_PLT16DBL
  static inline Status
  pcrela16dbl(unsigned char* view, Address value, Address address)
  {
    value -= address;
    if ((value & 1) != 0)
      return STATUS_OVERFLOW;
    if (This::template has_overflow_signed<17>(value))
      return STATUS_OVERFLOW;
    value >>= 1;
    This::template rela<16>(view, 0xffff, value);
    return STATUS_OK;
  }

  // R_390_PC24DBL, R_390_PLT24DBL
  static inline Status
  pcrela24dbl(unsigned char* view, Address value, Address address)
  {
    value -= address;
    if ((value & 1) != 0)
      return STATUS_OVERFLOW;
    if (This::template has_overflow_signed<25>(value))
      return STATUS_OVERFLOW;
    value >>= 1;
    // Swap doesn't take 24-bit fields well...
    This::template rela<8>(view, 0xff, value >> 16);
    This::template rela<16>(view + 1, 0xffff, value);
    return STATUS_OK;
  }

  // R_390_PC32DBL, R_390_PLT32DBL, R_390_GOTPCDBL, R_390_GOTENT, R_390_GOTPLTENT
  static inline Status
  pcrela32dbl(unsigned char* view, Address value, Address address)
  {
    Address reloc = value - address;
    if ((reloc & 1) != 0)
      {
	gold_warning(_("R_390_PC32DBL target misaligned at %llx"), (long long)address);
	// Wait for a fix for https://sourceware.org/bugzilla/show_bug.cgi?id=18960
	// return STATUS_OVERFLOW;
      }
    if (This::template has_overflow_signed<33>(reloc))
      return STATUS_OVERFLOW;
    reloc >>= 1;
    if (value < address && size == 32)
      reloc |= 0x80000000;
    This::template rela<32>(view, 0xffffffff, reloc);
    return STATUS_OK;
  }

};

// Initialize the PLT section.

template<int size>
void
Output_data_plt_s390<size>::init(Layout* layout)
{
  this->rel_ = new Reloc_section(false);
  layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
				  elfcpp::SHF_ALLOC, this->rel_,
				  ORDER_DYNAMIC_PLT_RELOCS, false);
}

template<int size>
void
Output_data_plt_s390<size>::do_adjust_output_section(Output_section* os)
{
  os->set_entsize(plt_entry_size);
}

// Add an entry to the PLT.

template<int size>
void
Output_data_plt_s390<size>::add_entry(Symbol_table* symtab, Layout* layout,
					Symbol* gsym)
{
  gold_assert(!gsym->has_plt_offset());

  unsigned int plt_index;
  off_t plt_offset;
  section_offset_type got_offset;

  unsigned int* pcount;
  unsigned int offset;
  unsigned int reserved;
  Output_section_data_build* got;
  if (gsym->type() == elfcpp::STT_GNU_IFUNC
      && gsym->can_use_relative_reloc(false))
    {
      pcount = &this->irelative_count_;
      offset = 0;
      reserved = 0;
      got = this->got_irelative_;
    }
  else
    {
      pcount = &this->count_;
      offset = 1;
      reserved = 3;
      got = this->got_plt_;
    }

  if (!this->is_data_size_valid())
    {
      // Note that when setting the PLT offset for a non-IRELATIVE
      // entry we skip the initial reserved PLT entry.
      plt_index = *pcount + offset;
      plt_offset = plt_index * plt_entry_size;

      ++*pcount;

      got_offset = (plt_index - offset + reserved) * size / 8;
      gold_assert(got_offset == got->current_data_size());

      // Every PLT entry needs a GOT entry which points back to the PLT
      // entry (this will be changed by the dynamic linker, normally
      // lazily when the function is called).
      got->set_current_data_size(got_offset + size / 8);
    }
  else
    {
      // FIXME: This is probably not correct for IRELATIVE relocs.

      // For incremental updates, find an available slot.
      plt_offset = this->free_list_.allocate(plt_entry_size,
					     plt_entry_size, 0);
      if (plt_offset == -1)
	gold_fallback(_("out of patch space (PLT);"
			" relink with --incremental-full"));

      // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset
      // can be calculated from the PLT index, adjusting for the three
      // reserved entries at the beginning of the GOT.
      plt_index = plt_offset / plt_entry_size - 1;
      got_offset = (plt_index - offset + reserved) * size / 8;
    }

  gsym->set_plt_offset(plt_offset);

  // Every PLT entry needs a reloc.
  this->add_relocation(symtab, layout, gsym, got_offset);

  // Note that we don't need to save the symbol.  The contents of the
  // PLT are independent of which symbols are used.  The symbols only
  // appear in the relocations.
}

// Add an entry to the PLT for a local STT_GNU_IFUNC symbol.  Return
// the PLT offset.

template<int size>
unsigned int
Output_data_plt_s390<size>::add_local_ifunc_entry(
    Symbol_table* symtab,
    Layout* layout,
    Sized_relobj_file<size, true>* relobj,
    unsigned int local_sym_index)
{
  unsigned int plt_offset = this->irelative_count_ * plt_entry_size;
  ++this->irelative_count_;

  section_offset_type got_offset = this->got_irelative_->current_data_size();

  // Every PLT entry needs a GOT entry which points back to the PLT
  // entry.
  this->got_irelative_->set_current_data_size(got_offset + size / 8);

  // Every PLT entry needs a reloc.
  Reloc_section* rela = this->rela_irelative(symtab, layout);
  rela->add_symbolless_local_addend(relobj, local_sym_index,
				    elfcpp::R_390_IRELATIVE,
				    this->got_irelative_, got_offset, 0);

  return plt_offset;
}

// Add the relocation for a PLT entry.

template<int size>
void
Output_data_plt_s390<size>::add_relocation(Symbol_table* symtab,
					     Layout* layout,
					     Symbol* gsym,
					     unsigned int got_offset)
{
  if (gsym->type() == elfcpp::STT_GNU_IFUNC
      && gsym->can_use_relative_reloc(false))
    {
      Reloc_section* rela = this->rela_irelative(symtab, layout);
      rela->add_symbolless_global_addend(gsym, elfcpp::R_390_IRELATIVE,
					 this->got_irelative_, got_offset, 0);
    }
  else
    {
      gsym->set_needs_dynsym_entry();
      this->rel_->add_global(gsym, elfcpp::R_390_JMP_SLOT, this->got_plt_,
			     got_offset, 0);
    }
}

// Return where the IRELATIVE relocations should go in the PLT.  These
// follow the JUMP_SLOT and the TLSDESC relocations.

template<int size>
typename Output_data_plt_s390<size>::Reloc_section*
Output_data_plt_s390<size>::rela_irelative(Symbol_table* symtab,
					     Layout* layout)
{
  if (this->irelative_rel_ == NULL)
    {
      this->irelative_rel_ = new Reloc_section(false);
      layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
				      elfcpp::SHF_ALLOC, this->irelative_rel_,
				      ORDER_DYNAMIC_PLT_RELOCS, false);
      gold_assert(this->irelative_rel_->output_section()
		  == this->rel_->output_section());

      if (parameters->doing_static_link())
	{
	  // A statically linked executable will only have a .rela.plt
	  // section to hold R_390_IRELATIVE relocs for
	  // STT_GNU_IFUNC symbols.  The library will use these
	  // symbols to locate the IRELATIVE relocs at program startup
	  // time.
	  symtab->define_in_output_data("__rela_iplt_start", NULL,
					Symbol_table::PREDEFINED,
					this->irelative_rel_, 0, 0,
					elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
					elfcpp::STV_HIDDEN, 0, false, true);
	  symtab->define_in_output_data("__rela_iplt_end", NULL,
					Symbol_table::PREDEFINED,
					this->irelative_rel_, 0, 0,
					elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
					elfcpp::STV_HIDDEN, 0, true, true);
	}
    }
  return this->irelative_rel_;
}

// Return the PLT address to use for a global symbol.

template<int size>
uint64_t
Output_data_plt_s390<size>::address_for_global(const Symbol* gsym)
{
  uint64_t offset = 0;
  if (gsym->type() == elfcpp::STT_GNU_IFUNC
      && gsym->can_use_relative_reloc(false))
    offset = (this->count_ + 1) * plt_entry_size;
  return this->address() + offset + gsym->plt_offset();
}

// Return the PLT address to use for a local symbol.  These are always
// IRELATIVE relocs.

template<int size>
uint64_t
Output_data_plt_s390<size>::address_for_local(const Relobj* object,
						unsigned int r_sym)
{
  return (this->address()
	  + (this->count_ + 1) * plt_entry_size
	  + object->local_plt_offset(r_sym));
}

// Set the final size.
template<int size>
void
Output_data_plt_s390<size>::set_final_data_size()
{
  unsigned int count = this->count_ + this->irelative_count_;
  this->set_data_size((count + 1) * plt_entry_size);
}

template<int size>
const unsigned char
Output_data_plt_s390<size>::first_plt_entry_32_abs[plt_entry_size] =
{
  0x50, 0x10, 0xf0, 0x1c, // st %r1, 28(%r15)
  0x0d, 0x10, // basr %r1, %r0
  0x58, 0x10, 0x10, 0x12, // l %r1, 18(%r1)
  0xd2, 0x03, 0xf0, 0x18, 0x10, 0x04, // mvc 24(4,%r15), 4(%r1)
  0x58, 0x10, 0x10, 0x08, // l %r1, 8(%r1)
  0x07, 0xf1, // br %r1
  0x00, 0x00, // padding
  0x00, 0x00, 0x00, 0x00, // _GLOBAL_OFFSET_TABLE_ (to fill)
  0x00, 0x00, 0x00, 0x00, // padding
};

template<int size>
const unsigned char
Output_data_plt_s390<size>::first_plt_entry_32_pic[plt_entry_size] =
{
  0x50, 0x10, 0xf0, 0x1c, // st %r1, 28(%r15)
  0x58, 0x10, 0xc0, 0x04, // l %r1, 4(%r12)
  0x50, 0x10, 0xf0, 0x18, // st %r1, 24(%r15)
  0x58, 0x10, 0xc0, 0x08, // l %r1, 8(%r12)
  0x07, 0xf1, // br %r1
  0x00, 0x00, // padding
  0x00, 0x00, 0x00, 0x00, // padding
  0x00, 0x00, 0x00, 0x00, // padding
  0x00, 0x00, 0x00, 0x00, // padding
};

template<int size>
const unsigned char
Output_data_plt_s390<size>::first_plt_entry_64[plt_entry_size] =
{
  0xe3, 0x10, 0xf0, 0x38, 0x00, 0x24, // stg %r1, 56(%r15)
  0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, // larl %r1, _GLOBAL_OFFSET_TABLE_ (to fill)
  0xd2, 0x07, 0xf0, 0x30, 0x10, 0x08, // mvc 48(8,%r15), 8(%r1)
  0xe3, 0x10, 0x10, 0x10, 0x00, 0x04, // lg %r1, 16(%r1)
  0x07, 0xf1, // br %r1
  0x07, 0x00, // nopr
  0x07, 0x00, // nopr
  0x07, 0x00, // nopr
};

template<int size>
void
Output_data_plt_s390<size>::fill_first_plt_entry(
    unsigned char* pov,
    typename elfcpp::Elf_types<size>::Elf_Addr got_address,
    typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
{
  if (size == 64)
    {
      memcpy(pov, first_plt_entry_64, plt_entry_size);
      S390_relocate_functions<size>::pcrela32dbl(pov + 8, got_address, (plt_address + 6));
    }
  else if (!parameters->options().output_is_position_independent())
    {
      memcpy(pov, first_plt_entry_32_abs, plt_entry_size);
      elfcpp::Swap<32, true>::writeval(pov + 24, got_address);
    }
  else
    {
      memcpy(pov, first_plt_entry_32_pic, plt_entry_size);
    }
}

template<int size>
const unsigned char
Output_data_plt_s390<size>::plt_entry_32_abs[plt_entry_size] =
{
  // first part
  0x0d, 0x10, // basr %r1, %r0
  0x58, 0x10, 0x10, 0x16, // l %r1, 22(%r1)
  0x58, 0x10, 0x10, 0x00, // l %r1, 0(%r1)
  0x07, 0xf1, // br %r1
  // second part
  0x0d, 0x10, // basr %r1, %r0
  0x58, 0x10, 0x10, 0x0e, // l %r1, 14(%r1)
  0xa7, 0xf4, 0x00, 0x00, // j first_plt_entry (to fill)
  0x00, 0x00, // padding
  0x00, 0x00, 0x00, 0x00, // _GLOBAL_OFFSET_TABLE_+sym@gotplt (to fill)
  0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill)
};

template<int size>
const unsigned char
Output_data_plt_s390<size>::plt_entry_32_pic12[plt_entry_size] =
{
  // first part
  0x58, 0x10, 0xc0, 0x00, // l %r1, sym@gotplt(%r12) (to fill)
  0x07, 0xf1, // br %r1
  0x00, 0x00, // padding
  0x00, 0x00, 0x00, 0x00, // padding
  // second part
  0x0d, 0x10, // basr %r1, %r0
  0x58, 0x10, 0x10, 0x0e, // l %r1, 14(%r1)
  0xa7, 0xf4, 0x00, 0x00, // j first_plt_entry (to fill)
  0x00, 0x00, // padding
  0x00, 0x00, 0x00, 0x00, // padding
  0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill)
};

template<int size>
const unsigned char
Output_data_plt_s390<size>::plt_entry_32_pic16[plt_entry_size] =
{
  // first part
  0xa7, 0x18, 0x00, 0x00, // lhi %r1, sym@gotplt (to fill)
  0x58, 0x11, 0xc0, 0x00, // l %r1, 0(%r1, %r12)
  0x07, 0xf1, // br %r1
  0x00, 0x00, // padding
  // second part
  0x0d, 0x10, // basr %r1, %r0
  0x58, 0x10, 0x10, 0x0e, // l %r1, 14(%r1)
  0xa7, 0xf4, 0x00, 0x00, // j first_plt_entry (to fill)
  0x00, 0x00, // padding
  0x00, 0x00, 0x00, 0x00, // padding
  0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill)
};

template<int size>
const unsigned char
Output_data_plt_s390<size>::plt_entry_32_pic[plt_entry_size] =
{
  // first part
  0x0d, 0x10, // basr %r1, %r0
  0x58, 0x10, 0x10, 0x16, // l %r1, 22(%r1)
  0x58, 0x11, 0xc0, 0x00, // l %r1, 0(%r1, %r12)
  0x07, 0xf1, // br %r1
  // second part
  0x0d, 0x10, // basr %r1, %r0
  0x58, 0x10, 0x10, 0x0e, // l %r1, 14(%r1)
  0xa7, 0xf4, 0x00, 0x00, // j first_plt_entry (to fill)
  0x00, 0x00, // padding
  0x00, 0x00, 0x00, 0x00, // sym@gotplt (to fill)
  0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill)
};

template<int size>
const unsigned char
Output_data_plt_s390<size>::plt_entry_64[plt_entry_size] =
{
  // first part
  0xc0, 0x10, 0x00, 0x00, 0x00, 0x00, // larl %r1, _GLOBAL_OFFSET_TABLE_+off (to fill)
  0xe3, 0x10, 0x10, 0x00, 0x00, 0x04, // lg %r1, 0(%r1)
  0x07, 0xf1, // br %r1
  // second part
  0x0d, 0x10, // basr %r1, %r0
  0xe3, 0x10, 0x10, 0x0c, 0x00, 0x14, // lgf %r1, 12(%r1)
  0xc0, 0xf4, 0x00, 0x00, 0x00, 0x00, // jg first_plt_entry (to fill)
  0x00, 0x00, 0x00, 0x00, // offset of relocation in .rela.plt (to fill)
};

template<int size>
unsigned int
Output_data_plt_s390<size>::fill_plt_entry(
    unsigned char* pov,
    typename elfcpp::Elf_types<size>::Elf_Addr got_address,
    typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
    unsigned int got_offset,
    unsigned int plt_offset,
    unsigned int plt_rel_offset)
{
  if (size == 64)
  {
    memcpy(pov, plt_entry_64, plt_entry_size);
    S390_relocate_functions<size>::pcrela32dbl(pov + 2, got_address + got_offset, plt_address + plt_offset);
    S390_relocate_functions<size>::pcrela32dbl(pov + 24, plt_address, plt_address + plt_offset + 22);
  }
  else
  {
    if (!parameters->options().output_is_position_independent())
      {
	memcpy(pov, plt_entry_32_abs, plt_entry_size);
	elfcpp::Swap<32, true>::writeval(pov + 24, got_address + got_offset);
      }
    else
      {
	if (got_offset < 0x1000)
	  {
	    memcpy(pov, plt_entry_32_pic12, plt_entry_size);
	    S390_relocate_functions<size>::rela12(pov + 2, got_offset);
	  }
	else if (got_offset < 0x8000)
	  {
	    memcpy(pov, plt_entry_32_pic16, plt_entry_size);
	    S390_relocate_functions<size>::rela16(pov + 2, got_offset);
	  }
	else
	  {
	    memcpy(pov, plt_entry_32_pic, plt_entry_size);
	    elfcpp::Swap<32, true>::writeval(pov + 24, got_offset);
	  }
      }
    typename elfcpp::Elf_types<size>::Elf_Addr target = plt_address;
    if (plt_offset >= 0x10000)
      {
	// Would overflow pcrela16dbl - aim at the farthest previous jump
	// we can reach.
	if (plt_offset > 0x10000)
	  {
	    // Use the full range of pcrel16dbl.
	    target = plt_address + plt_offset - 0x10000 + 18;
	  }
	else
	  {
	    // if plt_offset is exactly 0x10000, the above would aim at 18th byte
	    // of first_plt_entry, which doesn't have the jump back like the others.
	    // Aim at the next entry instead.
	    target = plt_address + plt_offset - 0xffe0 + 18;
	  }
      }
    S390_relocate_functions<size>::pcrela16dbl(pov + 20, target, plt_address + plt_offset + 18);
  }
  elfcpp::Swap<32, true>::writeval(pov + 28, plt_rel_offset);
  if (size == 64)
    return 14;
  else
    return 12;
}

// The .eh_frame unwind information for the PLT.

template<>
const unsigned char
Output_data_plt_s390<32>::plt_eh_frame_cie[plt_eh_frame_cie_size] =
{
  1,				// CIE version.
  'z',				// Augmentation: augmentation size included.
  'R',				// Augmentation: FDE encoding included.
  '\0',				// End of augmentation string.
  1,				// Code alignment factor.
  0x7c,				// Data alignment factor.
  14,				// Return address column.
  1,				// Augmentation size.
  (elfcpp::DW_EH_PE_pcrel	// FDE encoding.
   | elfcpp::DW_EH_PE_sdata4),
  elfcpp::DW_CFA_def_cfa, 15, 0x60,	// DW_CFA_def_cfa: r15 ofs 0x60.
};

template<>
const unsigned char
Output_data_plt_s390<64>::plt_eh_frame_cie[plt_eh_frame_cie_size] =
{
  1,				// CIE version.
  'z',				// Augmentation: augmentation size included.
  'R',				// Augmentation: FDE encoding included.
  '\0',				// End of augmentation string.
  1,				// Code alignment factor.
  0x78,				// Data alignment factor.
  14,				// Return address column.
  1,				// Augmentation size.
  (elfcpp::DW_EH_PE_pcrel	// FDE encoding.
   | elfcpp::DW_EH_PE_sdata4),
  elfcpp::DW_CFA_def_cfa, 15, 0xa0,	// DW_CFA_def_cfa: r15 ofs 0xa0.
};

template<int size>
const unsigned char
Output_data_plt_s390<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
{
  0, 0, 0, 0,				// Replaced with offset to .plt.
  0, 0, 0, 0,				// Replaced with size of .plt.
  0,					// Augmentation size.
  elfcpp::DW_CFA_nop,
  elfcpp::DW_CFA_nop,
  elfcpp::DW_CFA_nop
};

// Write out the PLT.  This uses the hand-coded instructions above,
// and adjusts them as needed.

template<int size>
void
Output_data_plt_s390<size>::do_write(Output_file* of)
{
  const off_t offset = this->offset();
  const section_size_type oview_size =
    convert_to_section_size_type(this->data_size());
  unsigned char* const oview = of->get_output_view(offset, oview_size);

  const off_t got_file_offset = this->got_plt_->offset();
  gold_assert(parameters->incremental_update()
	      || (got_file_offset + this->got_plt_->data_size()
		  == this->got_irelative_->offset()));
  const section_size_type got_size =
    convert_to_section_size_type(this->got_plt_->data_size()
				 + this->got_irelative_->data_size());
  unsigned char* const got_view = of->get_output_view(got_file_offset,
						      got_size);

  unsigned char* pov = oview;

  // The base address of the .plt section.
  typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address();
  // The base address of the PLT portion of the .got section,
  // which is where the GOT pointer will point, and where the
  // three reserved GOT entries are located.
  typename elfcpp::Elf_types<size>::Elf_Addr got_address
    = this->got_plt_->address();

  this->fill_first_plt_entry(pov, got_address, plt_address);
  pov += this->get_plt_entry_size();

  unsigned char* got_pov = got_view;

  const int rel_size = elfcpp::Elf_sizes<size>::rela_size;

  unsigned int plt_offset = this->get_plt_entry_size();
  unsigned int plt_rel_offset = 0;
  unsigned int got_offset = 3 * size / 8;
  const unsigned int count = this->count_ + this->irelative_count_;
  // The first three entries in the GOT are reserved, and are written
  // by Output_data_got_plt_s390::do_write.
  got_pov += 3 * size / 8;

  for (unsigned int plt_index = 0;
       plt_index < count;
       ++plt_index,
	 pov += plt_entry_size,
	 got_pov += size / 8,
	 plt_offset += plt_entry_size,
	 plt_rel_offset += rel_size,
	 got_offset += size / 8)
    {
      // Set and adjust the PLT entry itself.
      unsigned int lazy_offset = this->fill_plt_entry(pov,
						      got_address, plt_address,
						      got_offset, plt_offset,
						      plt_rel_offset);

      // Set the entry in the GOT.
      elfcpp::Swap<size, true>::writeval(got_pov,
					plt_address + plt_offset + lazy_offset);
    }

  gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
  gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);

  of->write_output_view(offset, oview_size, oview);
  of->write_output_view(got_file_offset, got_size, got_view);
}

// Get the GOT section, creating it if necessary.

template<int size>
Output_data_got<size, true>*
Target_s390<size>::got_section(Symbol_table* symtab, Layout* layout)
{
  if (this->got_ == NULL)
    {
      gold_assert(symtab != NULL && layout != NULL);

      // When using -z now, we can treat .got as a relro section.
      // Without -z now, it is modified after program startup by lazy
      // PLT relocations.
      bool is_got_relro = parameters->options().now();
      Output_section_order got_order = (is_got_relro
					? ORDER_RELRO_LAST
					: ORDER_DATA);

      // The old GNU linker creates a .got.plt section.  We just
      // create another set of data in the .got section.  Note that we
      // always create a PLT if we create a GOT, although the PLT
      // might be empty.
      this->got_plt_ = new Output_data_got_plt_s390<size>(layout);
      layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
				      (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
				      this->got_plt_, got_order, is_got_relro);

      // The first three entries are reserved.
      this->got_plt_->set_current_data_size(3 * size / 8);

      // If there are any IRELATIVE relocations, they get GOT entries
      // in .got.plt after the jump slot entries.
      this->got_irelative_ = new Output_data_space(size / 8, "** GOT IRELATIVE PLT");
      layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
				      (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
				      this->got_irelative_,
				      got_order, is_got_relro);

      // Unlike some targets (.e.g x86), S/390 does not use separate .got and
      // .got.plt sections in output.  The output .got section contains both
      // PLT and non-PLT GOT entries.
      this->got_ = new Output_data_got<size, true>();

      layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
				      (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
				      this->got_, got_order, is_got_relro);

      // Define _GLOBAL_OFFSET_TABLE_ at the start of the GOT.
      this->global_offset_table_ =
        symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
				      Symbol_table::PREDEFINED,
				      this->got_plt_,
				      0, 0, elfcpp::STT_OBJECT,
				      elfcpp::STB_LOCAL,
				      elfcpp::STV_HIDDEN, 0,
				      false, false);

    }
  return this->got_;
}

// Get the dynamic reloc section, creating it if necessary.

template<int size>
typename Target_s390<size>::Reloc_section*
Target_s390<size>::rela_dyn_section(Layout* layout)
{
  if (this->rela_dyn_ == NULL)
    {
      gold_assert(layout != NULL);
      this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
      layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
				      elfcpp::SHF_ALLOC, this->rela_dyn_,
				      ORDER_DYNAMIC_RELOCS, false);
    }
  return this->rela_dyn_;
}

// Get the section to use for IRELATIVE relocs, creating it if
// necessary.  These go in .rela.dyn, but only after all other dynamic
// relocations.  They need to follow the other dynamic relocations so
// that they can refer to global variables initialized by those
// relocs.

template<int size>
typename Target_s390<size>::Reloc_section*
Target_s390<size>::rela_irelative_section(Layout* layout)
{
  if (this->rela_irelative_ == NULL)
    {
      // Make sure we have already created the dynamic reloc section.
      this->rela_dyn_section(layout);
      this->rela_irelative_ = new Reloc_section(false);
      layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
				      elfcpp::SHF_ALLOC, this->rela_irelative_,
				      ORDER_DYNAMIC_RELOCS, false);
      gold_assert(this->rela_dyn_->output_section()
		  == this->rela_irelative_->output_section());
    }
  return this->rela_irelative_;
}

// Write the first three reserved words of the .got.plt section.
// The remainder of the section is written while writing the PLT
// in Output_data_plt_s390::do_write.

template<int size>
void
Output_data_got_plt_s390<size>::do_write(Output_file* of)
{
  // The first entry in the GOT is the address of the .dynamic section
  // aka the PT_DYNAMIC segment.  The next two entries are reserved.
  // We saved space for them when we created the section in
  // Target_x86_64::got_section.
  const off_t got_file_offset = this->offset();
  gold_assert(this->data_size() >= 3 * size / 8);
  unsigned char* const got_view =
      of->get_output_view(got_file_offset, 3 * size / 8);
  Output_section* dynamic = this->layout_->dynamic_section();
  uint64_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
  elfcpp::Swap<size, true>::writeval(got_view, dynamic_addr);
  memset(got_view + size / 8, 0, 2 * size / 8);
  of->write_output_view(got_file_offset, 3 * size / 8, got_view);
}

// Create the PLT section.

template<int size>
void
Target_s390<size>::make_plt_section(Symbol_table* symtab, Layout* layout)
{
  if (this->plt_ == NULL)
    {
      // Create the GOT sections first.
      this->got_section(symtab, layout);

      // Ensure that .rela.dyn always appears before .rela.plt  This is
      // necessary due to how, on 32-bit S/390 and some other targets,
      // .rela.dyn needs to include .rela.plt in it's range.
      this->rela_dyn_section(layout);

      this->plt_ = new Output_data_plt_s390<size>(layout,
		      this->got_, this->got_plt_, this->got_irelative_);

      // Add unwind information if requested.
      if (parameters->options().ld_generated_unwind_info())
	this->plt_->add_eh_frame(layout);

      layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
				      (elfcpp::SHF_ALLOC
				       | elfcpp::SHF_EXECINSTR),
				      this->plt_, ORDER_PLT, false);

      // Make the sh_info field of .rela.plt point to .plt.
      Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
      rela_plt_os->set_info_section(this->plt_->output_section());
    }
}

// Create a PLT entry for a global symbol.

template<int size>
void
Target_s390<size>::make_plt_entry(Symbol_table* symtab, Layout* layout,
				    Symbol* gsym)
{
  if (gsym->has_plt_offset())
    return;

  if (this->plt_ == NULL)
    this->make_plt_section(symtab, layout);

  this->plt_->add_entry(symtab, layout, gsym);
}

// Make a PLT entry for a local STT_GNU_IFUNC symbol.

template<int size>
void
Target_s390<size>::make_local_ifunc_plt_entry(
    Symbol_table* symtab, Layout* layout,
    Sized_relobj_file<size, true>* relobj,
    unsigned int local_sym_index)
{
  if (relobj->local_has_plt_offset(local_sym_index))
    return;
  if (this->plt_ == NULL)
    this->make_plt_section(symtab, layout);
  unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout,
							      relobj,
							      local_sym_index);
  relobj->set_local_plt_offset(local_sym_index, plt_offset);
}

// Return the number of entries in the PLT.

template<int size>
unsigned int
Target_s390<size>::plt_entry_count() const
{
  if (this->plt_ == NULL)
    return 0;
  return this->plt_->entry_count();
}

// Return the offset of the first non-reserved PLT entry.

template<int size>
unsigned int
Target_s390<size>::first_plt_entry_offset() const
{
  return this->plt_->first_plt_entry_offset();
}

// Return the size of each PLT entry.

template<int size>
unsigned int
Target_s390<size>::plt_entry_size() const
{
  return this->plt_->get_plt_entry_size();
}

// Create the GOT and PLT sections for an incremental update.

template<int size>
Output_data_got_base*
Target_s390<size>::init_got_plt_for_update(Symbol_table* symtab,
				       Layout* layout,
				       unsigned int got_count,
				       unsigned int plt_count)
{
  gold_assert(this->got_ == NULL);

  // Add the three reserved entries.
  this->got_plt_ = new Output_data_got_plt_s390<size>(layout, (plt_count + 3) * size / 8);
  layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
				  (elfcpp::SHF_ALLOC
				   | elfcpp::SHF_WRITE),
				  this->got_plt_, ORDER_NON_RELRO_FIRST,
				  false);

  // If there are any IRELATIVE relocations, they get GOT entries in
  // .got.plt after the jump slot entries.
  this->got_irelative_ = new Output_data_space(0, size / 8, "** GOT IRELATIVE PLT");
  layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
				  elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
				  this->got_irelative_,
				  ORDER_NON_RELRO_FIRST, false);

  this->got_ = new Output_data_got<size, true>(got_count * size / 8);
  layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
				  (elfcpp::SHF_ALLOC
				   | elfcpp::SHF_WRITE),
				  this->got_, ORDER_RELRO_LAST,
				  true);

  // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
  this->global_offset_table_ =
    symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
				  Symbol_table::PREDEFINED,
				  this->got_plt_,
				  0, 0, elfcpp::STT_OBJECT,
				  elfcpp::STB_LOCAL,
				  elfcpp::STV_HIDDEN, 0,
				  false, false);

  // Create the PLT section.
  this->plt_ = new Output_data_plt_s390<size>(layout,
		  this->got_, this->got_plt_, this->got_irelative_, plt_count);

  // Add unwind information if requested.
  if (parameters->options().ld_generated_unwind_info())
    this->plt_->add_eh_frame(layout);

  layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
				  elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
				  this->plt_, ORDER_PLT, false);

  // Make the sh_info field of .rela.plt point to .plt.
  Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
  rela_plt_os->set_info_section(this->plt_->output_section());

  // Create the rela_dyn section.
  this->rela_dyn_section(layout);

  return this->got_;
}

// Reserve a GOT entry for a local symbol, and regenerate any
// necessary dynamic relocations.

template<int size>
void
Target_s390<size>::reserve_local_got_entry(
    unsigned int got_index,
    Sized_relobj<size, true>* obj,
    unsigned int r_sym,
    unsigned int got_type)
{
  unsigned int got_offset = got_index * size / 8;
  Reloc_section* rela_dyn = this->rela_dyn_section(NULL);

  this->got_->reserve_local(got_index, obj, r_sym, got_type);
  switch (got_type)
    {
    case GOT_TYPE_STANDARD:
      if (parameters->options().output_is_position_independent())
	rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_390_RELATIVE,
				     this->got_, got_offset, 0, false);
      break;
    case GOT_TYPE_TLS_OFFSET:
      rela_dyn->add_local(obj, r_sym, elfcpp::R_390_TLS_TPOFF,
			  this->got_, got_offset, 0);
      break;
    case GOT_TYPE_TLS_PAIR:
      this->got_->reserve_slot(got_index + 1);
      rela_dyn->add_local(obj, r_sym, elfcpp::R_390_TLS_DTPMOD,
			  this->got_, got_offset, 0);
      break;
    default:
      gold_unreachable();
    }
}

// Reserve a GOT entry for a global symbol, and regenerate any
// necessary dynamic relocations.

template<int size>
void
Target_s390<size>::reserve_global_got_entry(unsigned int got_index,
					      Symbol* gsym,
					      unsigned int got_type)
{
  unsigned int got_offset = got_index * size / 8;
  Reloc_section* rela_dyn = this->rela_dyn_section(NULL);

  this->got_->reserve_global(got_index, gsym, got_type);
  switch (got_type)
    {
    case GOT_TYPE_STANDARD:
      if (!gsym->final_value_is_known())
	{
	  if (gsym->is_from_dynobj()
	      || gsym->is_undefined()
	      || gsym->is_preemptible()
	      || gsym->type() == elfcpp::STT_GNU_IFUNC)
	    rela_dyn->add_global(gsym, elfcpp::R_390_GLOB_DAT,
				 this->got_, got_offset, 0);
	  else
	    rela_dyn->add_global_relative(gsym, elfcpp::R_390_RELATIVE,
					  this->got_, got_offset, 0, false);
	}
      break;
    case GOT_TYPE_TLS_OFFSET:
      rela_dyn->add_global_relative(gsym, elfcpp::R_390_TLS_TPOFF,
				    this->got_, got_offset, 0, false);
      break;
    case GOT_TYPE_TLS_PAIR:
      this->got_->reserve_slot(got_index + 1);
      rela_dyn->add_global_relative(gsym, elfcpp::R_390_TLS_DTPMOD,
				    this->got_, got_offset, 0, false);
      rela_dyn->add_global_relative(gsym, elfcpp::R_390_TLS_DTPOFF,
				    this->got_, got_offset + size / 8, 0, false);
      break;
    default:
      gold_unreachable();
    }
}

// Register an existing PLT entry for a global symbol.

template<int size>
void
Target_s390<size>::register_global_plt_entry(Symbol_table* symtab,
					       Layout* layout,
					       unsigned int plt_index,
					       Symbol* gsym)
{
  gold_assert(this->plt_ != NULL);
  gold_assert(!gsym->has_plt_offset());

  this->plt_->reserve_slot(plt_index);

  gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size());

  unsigned int got_offset = (plt_index + 3) * size / 8;
  this->plt_->add_relocation(symtab, layout, gsym, got_offset);
}

// Force a COPY relocation for a given symbol.

template<int size>
void
Target_s390<size>::emit_copy_reloc(
    Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset)
{
  this->copy_relocs_.emit_copy_reloc(symtab,
				     symtab->get_sized_symbol<size>(sym),
				     os,
				     offset,
				     this->rela_dyn_section(NULL));
}

// Create a GOT entry for the TLS module index.

template<int size>
unsigned int
Target_s390<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout,
					 Sized_relobj_file<size, true>* object)
{
  if (this->got_mod_index_offset_ == -1U)
    {
      gold_assert(symtab != NULL && layout != NULL && object != NULL);
      Reloc_section* rela_dyn = this->rela_dyn_section(layout);
      Output_data_got<size, true>* got = this->got_section(symtab, layout);
      unsigned int got_offset = got->add_constant(0);
      rela_dyn->add_local(object, 0, elfcpp::R_390_TLS_DTPMOD, got,
			  got_offset, 0);
      got->add_constant(0);
      this->got_mod_index_offset_ = got_offset;
    }
  return this->got_mod_index_offset_;
}

// Optimize the TLS relocation type based on what we know about the
// symbol.  IS_FINAL is true if the final address of this symbol is
// known at link time.

template<int size>
tls::Tls_optimization
Target_s390<size>::optimize_tls_reloc(bool is_final, int r_type)
{
  // If we are generating a shared library, then we can't do anything
  // in the linker.
  if (parameters->options().shared())
    return tls::TLSOPT_NONE;

  switch (r_type)
    {
    case elfcpp::R_390_TLS_GD32:
    case elfcpp::R_390_TLS_GD64:
    case elfcpp::R_390_TLS_GDCALL:
      // These are General-Dynamic which permits fully general TLS
      // access.  Since we know that we are generating an executable,
      // we can convert this to Initial-Exec.  If we also know that
      // this is a local symbol, we can further switch to Local-Exec.
      if (is_final)
	return tls::TLSOPT_TO_LE;
      return tls::TLSOPT_TO_IE;

    case elfcpp::R_390_TLS_LDM32:
    case elfcpp::R_390_TLS_LDM64:
    case elfcpp::R_390_TLS_LDO32:
    case elfcpp::R_390_TLS_LDO64:
    case elfcpp::R_390_TLS_LDCALL:
      // This is Local-Dynamic, which refers to a local symbol in the
      // dynamic TLS block.  Since we know that we generating an
      // executable, we can switch to Local-Exec.
      return tls::TLSOPT_TO_LE;

    case elfcpp::R_390_TLS_IE32:
    case elfcpp::R_390_TLS_IE64:
    case elfcpp::R_390_TLS_GOTIE32:
    case elfcpp::R_390_TLS_GOTIE64:
    case elfcpp::R_390_TLS_LOAD:
      // These are Initial-Exec relocs which get the thread offset
      // from the GOT.  If we know that we are linking against the
      // local symbol, we can switch to Local-Exec, which links the
      // thread offset into the instruction.
      if (is_final)
	return tls::TLSOPT_TO_LE;
      return tls::TLSOPT_NONE;

    case elfcpp::R_390_TLS_GOTIE12:
    case elfcpp::R_390_TLS_IEENT:
    case elfcpp::R_390_TLS_GOTIE20:
      // These are Initial-Exec, but cannot be optimized.
      return tls::TLSOPT_NONE;

    case elfcpp::R_390_TLS_LE32:
    case elfcpp::R_390_TLS_LE64:
      // When we already have Local-Exec, there is nothing further we
      // can do.
      return tls::TLSOPT_NONE;

    default:
      gold_unreachable();
    }
}

// Get the Reference_flags for a particular relocation.

template<int size>
int
Target_s390<size>::Scan::get_reference_flags(unsigned int r_type)
{
  switch (r_type)
    {
    case elfcpp::R_390_NONE:
    case elfcpp::R_390_GNU_VTINHERIT:
    case elfcpp::R_390_GNU_VTENTRY:
    case elfcpp::R_390_GOTPC:
    case elfcpp::R_390_GOTPCDBL:
      // No symbol reference.
      return 0;

    case elfcpp::R_390_64:
    case elfcpp::R_390_32:
    case elfcpp::R_390_20:
    case elfcpp::R_390_16:
    case elfcpp::R_390_12:
    case elfcpp::R_390_8:
      return Symbol::ABSOLUTE_REF;

    case elfcpp::R_390_PC12DBL:
    case elfcpp::R_390_PC16:
    case elfcpp::R_390_PC16DBL:
    case elfcpp::R_390_PC24DBL:
    case elfcpp::R_390_PC32:
    case elfcpp::R_390_PC32DBL:
    case elfcpp::R_390_PC64:
    case elfcpp::R_390_GOTOFF16:
    case elfcpp::R_390_GOTOFF32:
    case elfcpp::R_390_GOTOFF64:
      return Symbol::RELATIVE_REF;

    case elfcpp::R_390_PLT12DBL:
    case elfcpp::R_390_PLT16DBL:
    case elfcpp::R_390_PLT24DBL:
    case elfcpp::R_390_PLT32:
    case elfcpp::R_390_PLT32DBL:
    case elfcpp::R_390_PLT64:
    case elfcpp::R_390_PLTOFF16:
    case elfcpp::R_390_PLTOFF32:
    case elfcpp::R_390_PLTOFF64:
      return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;

    case elfcpp::R_390_GOT12:
    case elfcpp::R_390_GOT16:
    case elfcpp::R_390_GOT20:
    case elfcpp::R_390_GOT32:
    case elfcpp::R_390_GOT64:
    case elfcpp::R_390_GOTENT:
    case elfcpp::R_390_GOTPLT12:
    case elfcpp::R_390_GOTPLT16:
    case elfcpp::R_390_GOTPLT20:
    case elfcpp::R_390_GOTPLT32:
    case elfcpp::R_390_GOTPLT64:
    case elfcpp::R_390_GOTPLTENT:
      // Absolute in GOT.
      return Symbol::ABSOLUTE_REF;

    case elfcpp::R_390_TLS_GD32:          // Global-dynamic
    case elfcpp::R_390_TLS_GD64:
    case elfcpp::R_390_TLS_GDCALL:
    case elfcpp::R_390_TLS_LDM32:         // Local-dynamic
    case elfcpp::R_390_TLS_LDM64:
    case elfcpp::R_390_TLS_LDO32:
    case elfcpp::R_390_TLS_LDO64:
    case elfcpp::R_390_TLS_LDCALL:
    case elfcpp::R_390_TLS_IE32:          // Initial-exec
    case elfcpp::R_390_TLS_IE64:
    case elfcpp::R_390_TLS_IEENT:
    case elfcpp::R_390_TLS_GOTIE12:
    case elfcpp::R_390_TLS_GOTIE20:
    case elfcpp::R_390_TLS_GOTIE32:
    case elfcpp::R_390_TLS_GOTIE64:
    case elfcpp::R_390_TLS_LOAD:
    case elfcpp::R_390_TLS_LE32:          // Local-exec
    case elfcpp::R_390_TLS_LE64:
      return Symbol::TLS_REF;

    case elfcpp::R_390_COPY:
    case elfcpp::R_390_GLOB_DAT:
    case elfcpp::R_390_JMP_SLOT:
    case elfcpp::R_390_RELATIVE:
    case elfcpp::R_390_IRELATIVE:
    case elfcpp::R_390_TLS_TPOFF:
    case elfcpp::R_390_TLS_DTPOFF:
    case elfcpp::R_390_TLS_DTPMOD:
    default:
      // Not expected.  We will give an error later.
      return 0;
    }
}

// Report an unsupported relocation against a local symbol.

template<int size>
void
Target_s390<size>::Scan::unsupported_reloc_local(
     Sized_relobj_file<size, true>* object,
     unsigned int r_type)
{
  gold_error(_("%s: unsupported reloc %u against local symbol"),
	     object->name().c_str(), r_type);
}

// We are about to emit a dynamic relocation of type R_TYPE.  If the
// dynamic linker does not support it, issue an error.

template<int size>
void
Target_s390<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type)
{
  gold_assert(r_type != elfcpp::R_390_NONE);

  if (size == 64)
    {
      switch (r_type)
	{
	  // These are the relocation types supported by glibc for s390 64-bit.
	case elfcpp::R_390_RELATIVE:
	case elfcpp::R_390_IRELATIVE:
	case elfcpp::R_390_COPY:
	case elfcpp::R_390_GLOB_DAT:
	case elfcpp::R_390_JMP_SLOT:
	case elfcpp::R_390_TLS_DTPMOD:
	case elfcpp::R_390_TLS_DTPOFF:
	case elfcpp::R_390_TLS_TPOFF:
	case elfcpp::R_390_8:
	case elfcpp::R_390_16:
	case elfcpp::R_390_32:
	case elfcpp::R_390_64:
	case elfcpp::R_390_PC16:
	case elfcpp::R_390_PC16DBL:
	case elfcpp::R_390_PC32:
	case elfcpp::R_390_PC32DBL:
	case elfcpp::R_390_PC64:
	  return;

	default:
	  break;
	}
    }
  else
    {
      switch (r_type)
	{
	  // These are the relocation types supported by glibc for s390 32-bit.
	case elfcpp::R_390_RELATIVE:
	case elfcpp::R_390_IRELATIVE:
	case elfcpp::R_390_COPY:
	case elfcpp::R_390_GLOB_DAT:
	case elfcpp::R_390_JMP_SLOT:
	case elfcpp::R_390_TLS_DTPMOD:
	case elfcpp::R_390_TLS_DTPOFF:
	case elfcpp::R_390_TLS_TPOFF:
	case elfcpp::R_390_8:
	case elfcpp::R_390_16:
	case elfcpp::R_390_32:
	case elfcpp::R_390_PC16:
	case elfcpp::R_390_PC16DBL:
	case elfcpp::R_390_PC32:
	case elfcpp::R_390_PC32DBL:
	  return;

	default:
	  break;
	}
    }

  // This prevents us from issuing more than one error per reloc
  // section.  But we can still wind up issuing more than one
  // error per object file.
  if (this->issued_non_pic_error_)
    return;
  gold_assert(parameters->options().output_is_position_independent());
  object->error(_("requires unsupported dynamic reloc; "
		  "recompile with -fPIC"));
  this->issued_non_pic_error_ = true;
  return;
}

// Return whether we need to make a PLT entry for a relocation of the
// given type against a STT_GNU_IFUNC symbol.

template<int size>
bool
Target_s390<size>::Scan::reloc_needs_plt_for_ifunc(
     Sized_relobj_file<size, true>* object,
     unsigned int r_type)
{
  int flags = Scan::get_reference_flags(r_type);
  if (flags & Symbol::TLS_REF)
    gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"),
	       object->name().c_str(), r_type);
  return flags != 0;
}

// Scan a relocation for a local symbol.

template<int size>
inline void
Target_s390<size>::Scan::local(Symbol_table* symtab,
				 Layout* layout,
				 Target_s390<size>* target,
				 Sized_relobj_file<size, true>* object,
				 unsigned int data_shndx,
				 Output_section* output_section,
				 const elfcpp::Rela<size, true>& reloc,
				 unsigned int r_type,
				 const elfcpp::Sym<size, true>& lsym,
				 bool is_discarded)
{
  if (is_discarded)
    return;

  // A local STT_GNU_IFUNC symbol may require a PLT entry.
  bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC;

  if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type))
    {
      unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
      target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
    }

  switch (r_type)
    {
    case elfcpp::R_390_NONE:
    case elfcpp::R_390_GNU_VTINHERIT:
    case elfcpp::R_390_GNU_VTENTRY:
      break;

    case elfcpp::R_390_64:
      // If building a shared library (or a position-independent
      // executable), we need to create a dynamic relocation for this
      // location.  The relocation applied at link time will apply the
      // link-time value, so we flag the location with an
      // R_390_RELATIVE relocation so the dynamic loader can
      // relocate it easily.
      if (parameters->options().output_is_position_independent() && size == 64)
	{
	  unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
	  Reloc_section* rela_dyn = target->rela_dyn_section(layout);
	  rela_dyn->add_local_relative(object, r_sym,
				       elfcpp::R_390_RELATIVE,
				       output_section, data_shndx,
				       reloc.get_r_offset(),
				       reloc.get_r_addend(), is_ifunc);
	}
      break;

    case elfcpp::R_390_32:
    case elfcpp::R_390_20:
    case elfcpp::R_390_16:
    case elfcpp::R_390_12:
    case elfcpp::R_390_8:
      if (parameters->options().output_is_position_independent())
	{
	  if (size == 32 && r_type == elfcpp::R_390_32)
	    {
	      unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
	      Reloc_section* rela_dyn = target->rela_dyn_section(layout);
	      rela_dyn->add_local_relative(object, r_sym,
					   elfcpp::R_390_RELATIVE,
					   output_section, data_shndx,
					   reloc.get_r_offset(),
					   reloc.get_r_addend(), is_ifunc);
	      break;
	    }

	  check_non_pic(object, r_type);

	  Reloc_section* rela_dyn = target->rela_dyn_section(layout);
	  unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
	  if (lsym.get_st_type() != elfcpp::STT_SECTION)
	    rela_dyn->add_local(object, r_sym, r_type, output_section,
				data_shndx, reloc.get_r_offset(),
				reloc.get_r_addend());
	  else
	    {
	      gold_assert(lsym.get_st_value() == 0);
	      unsigned int shndx = lsym.get_st_shndx();
	      bool is_ordinary;
	      shndx = object->adjust_sym_shndx(r_sym, shndx,
					       &is_ordinary);
	      if (!is_ordinary)
		object->error(_("section symbol %u has bad shndx %u"),
			      r_sym, shndx);
	      else
		rela_dyn->add_local_section(object, shndx,
					    r_type, output_section,
					    data_shndx, reloc.get_r_offset(),
					    reloc.get_r_addend());
	    }
	}
      break;

    case elfcpp::R_390_PC12DBL:
    case elfcpp::R_390_PC16:
    case elfcpp::R_390_PC16DBL:
    case elfcpp::R_390_PC24DBL:
    case elfcpp::R_390_PC32:
    case elfcpp::R_390_PC32DBL:
    case elfcpp::R_390_PC64:
      break;

    case elfcpp::R_390_PLT12DBL:
    case elfcpp::R_390_PLT16DBL:
    case elfcpp::R_390_PLT24DBL:
    case elfcpp::R_390_PLT32:
    case elfcpp::R_390_PLT32DBL:
    case elfcpp::R_390_PLT64:
      // Since we know this is a local symbol, we can handle this as a
      // PC32 reloc.
      break;

    case elfcpp::R_390_GOTPC:
    case elfcpp::R_390_GOTPCDBL:
    case elfcpp::R_390_GOTOFF16:
    case elfcpp::R_390_GOTOFF32:
    case elfcpp::R_390_GOTOFF64:
    case elfcpp::R_390_PLTOFF16:
    case elfcpp::R_390_PLTOFF32:
    case elfcpp::R_390_PLTOFF64:
      // We need a GOT section.
      target->got_section(symtab, layout);
      // For PLTOFF*, we'd normally want a PLT section, but since we
      // know this is a local symbol, no PLT is needed.
      break;

    case elfcpp::R_390_GOT12:
    case elfcpp::R_390_GOT16:
    case elfcpp::R_390_GOT20:
    case elfcpp::R_390_GOT32:
    case elfcpp::R_390_GOT64:
    case elfcpp::R_390_GOTENT:
    case elfcpp::R_390_GOTPLT12:
    case elfcpp::R_390_GOTPLT16:
    case elfcpp::R_390_GOTPLT20:
    case elfcpp::R_390_GOTPLT32:
    case elfcpp::R_390_GOTPLT64:
    case elfcpp::R_390_GOTPLTENT:
      {
	// The symbol requires a GOT section.
	Output_data_got<size, true>* got = target->got_section(symtab, layout);

	// The symbol requires a GOT entry.
	unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());

	// For a STT_GNU_IFUNC symbol we want the PLT offset.  That
	// lets function pointers compare correctly with shared
	// libraries.  Otherwise we would need an IRELATIVE reloc.
	bool is_new;
	if (is_ifunc)
	  is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
	else
	  is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD);
	if (is_new)
	  {
	    // If we are generating a shared object, we need to add a
	    // dynamic relocation for this symbol's GOT entry.
	    if (parameters->options().output_is_position_independent())
	      {
		Reloc_section* rela_dyn = target->rela_dyn_section(layout);
		unsigned int got_offset =
		  object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
		rela_dyn->add_local_relative(object, r_sym,
					     elfcpp::R_390_RELATIVE,
					     got, got_offset, 0, is_ifunc);
	      }
	  }
	// For GOTPLT*, we'd normally want a PLT section, but since
	// we know this is a local symbol, no PLT is needed.
      }
      break;

    case elfcpp::R_390_COPY:
    case elfcpp::R_390_GLOB_DAT:
    case elfcpp::R_390_JMP_SLOT:
    case elfcpp::R_390_RELATIVE:
    case elfcpp::R_390_IRELATIVE:
      // These are outstanding tls relocs, which are unexpected when linking
    case elfcpp::R_390_TLS_TPOFF:
    case elfcpp::R_390_TLS_DTPOFF:
    case elfcpp::R_390_TLS_DTPMOD:
      gold_error(_("%s: unexpected reloc %u in object file"),
		 object->name().c_str(), r_type);
      break;

      // These are initial tls relocs, which are expected when linking
    case elfcpp::R_390_TLS_GD32:          // Global-dynamic
    case elfcpp::R_390_TLS_GD64:
    case elfcpp::R_390_TLS_GDCALL:
    case elfcpp::R_390_TLS_LDM32:         // Local-dynamic
    case elfcpp::R_390_TLS_LDM64:
    case elfcpp::R_390_TLS_LDO32:
    case elfcpp::R_390_TLS_LDO64:
    case elfcpp::R_390_TLS_LDCALL:
    case elfcpp::R_390_TLS_IE32:          // Initial-exec
    case elfcpp::R_390_TLS_IE64:
    case elfcpp::R_390_TLS_IEENT:
    case elfcpp::R_390_TLS_GOTIE12:
    case elfcpp::R_390_TLS_GOTIE20:
    case elfcpp::R_390_TLS_GOTIE32:
    case elfcpp::R_390_TLS_GOTIE64:
    case elfcpp::R_390_TLS_LOAD:
    case elfcpp::R_390_TLS_LE32:          // Local-exec
    case elfcpp::R_390_TLS_LE64:
      {
	bool output_is_shared = parameters->options().shared();
	const tls::Tls_optimization optimized_type
	    = Target_s390<size>::optimize_tls_reloc(!output_is_shared,
						      r_type);
	switch (r_type)
	  {
	  case elfcpp::R_390_TLS_GD32:       // General-dynamic
	  case elfcpp::R_390_TLS_GD64:
	  case elfcpp::R_390_TLS_GDCALL:
	    if (optimized_type == tls::TLSOPT_NONE)
	      {
		// Create a pair of GOT entries for the module index and
		// dtv-relative offset.
		Output_data_got<size, true>* got
		    = target->got_section(symtab, layout);
		unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
		unsigned int shndx = lsym.get_st_shndx();
		bool is_ordinary;
		shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
		if (!is_ordinary)
		  object->error(_("local symbol %u has bad shndx %u"),
			      r_sym, shndx);
		else
		  got->add_local_pair_with_rel(object, r_sym,
					       shndx,
					       GOT_TYPE_TLS_PAIR,
					       target->rela_dyn_section(layout),
					       elfcpp::R_390_TLS_DTPMOD);
	      }
	    else if (optimized_type != tls::TLSOPT_TO_LE)
	      unsupported_reloc_local(object, r_type);
	    break;

	  case elfcpp::R_390_TLS_LDM32:       // Local-dynamic
	  case elfcpp::R_390_TLS_LDM64:
	  case elfcpp::R_390_TLS_LDCALL:
	    if (optimized_type == tls::TLSOPT_NONE)
	      {
		// Create a GOT entry for the module index.
		target->got_mod_index_entry(symtab, layout, object);
	      }
	    else if (optimized_type != tls::TLSOPT_TO_LE)
	      unsupported_reloc_local(object, r_type);
	    break;

	  case elfcpp::R_390_TLS_LDO32:
	  case elfcpp::R_390_TLS_LDO64:
	    break;

	  case elfcpp::R_390_TLS_IE32:    // Initial-exec
	  case elfcpp::R_390_TLS_IE64:
	    // These two involve an absolute address
	    if (parameters->options().shared()
		&& optimized_type == tls::TLSOPT_NONE)
	      {
		if ((size == 32 && r_type == elfcpp::R_390_TLS_IE32) ||
		    (size == 64 && r_type == elfcpp::R_390_TLS_IE64))
		  {
		    // We need to create a dynamic relocation.
		    Reloc_section* rela_dyn = target->rela_dyn_section(layout);
		    unsigned int r_sym =
			elfcpp::elf_r_sym<size>(reloc.get_r_info());
		    rela_dyn->add_local_relative(object, r_sym,
						elfcpp::R_390_RELATIVE,
						output_section, data_shndx,
						reloc.get_r_offset(),
						reloc.get_r_addend(), false);
		  }
		else
		  {
		    unsupported_reloc_local(object, r_type);
		  }
	      }
	    // fall through
	  case elfcpp::R_390_TLS_IEENT:
	  case elfcpp::R_390_TLS_GOTIE12:
	  case elfcpp::R_390_TLS_GOTIE20:
	  case elfcpp::R_390_TLS_GOTIE32:
	  case elfcpp::R_390_TLS_GOTIE64:
	  case elfcpp::R_390_TLS_LOAD:
	    layout->set_has_static_tls();
	    if (optimized_type == tls::TLSOPT_NONE)
	      {
		if (!output_is_shared)
		  {
		    // We're making an executable, and the symbol is local, but
		    // we cannot optimize to LE.  Make a const GOT entry instead.
		    Output_data_got<size, true>* got
			= target->got_section(symtab, layout);
		    unsigned int r_sym
			= elfcpp::elf_r_sym<size>(reloc.get_r_info());
		    got->add_local_plt(object, r_sym, GOT_TYPE_TLS_OFFSET);
		  }
		else
		{
		  // Create a GOT entry for the tp-relative offset.
		  Output_data_got<size, true>* got
		      = target->got_section(symtab, layout);
		  unsigned int r_sym
		      = elfcpp::elf_r_sym<size>(reloc.get_r_info());
		  got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET,
					  target->rela_dyn_section(layout),
					  elfcpp::R_390_TLS_TPOFF);
		}
	      }
	    else if (optimized_type != tls::TLSOPT_TO_LE)
	      unsupported_reloc_local(object, r_type);
	    break;

	  case elfcpp::R_390_TLS_LE32:     // Local-exec
	  case elfcpp::R_390_TLS_LE64:
	    layout->set_has_static_tls();
	    if (output_is_shared)
	    {
	      // We need to create a dynamic relocation.
	      if ((size == 32 && r_type == elfcpp::R_390_TLS_LE32) ||
	          (size == 64 && r_type == elfcpp::R_390_TLS_LE64))
		{
		  Reloc_section* rela_dyn = target->rela_dyn_section(layout);
		  unsigned int r_sym
		      = elfcpp::elf_r_sym<size>(reloc.get_r_info());
		  gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
		  rela_dyn->add_local(object, r_sym, elfcpp::R_390_TLS_TPOFF,
				      output_section, data_shndx,
				      reloc.get_r_offset(),
				      reloc.get_r_addend());
		}
	      else
		{
		  unsupported_reloc_local(object, r_type);
		}
	    }
	    break;

	  default:
	    gold_unreachable();
	  }
      }
      break;

    default:
      gold_error(_("%s: unsupported reloc %u against local symbol"),
		 object->name().c_str(), r_type);
      break;
    }
}

// Scan a relocation for a global symbol.

template<int size>
inline void
Target_s390<size>::Scan::global(Symbol_table* symtab,
			    Layout* layout,
			    Target_s390<size>* target,
			    Sized_relobj_file<size, true>* object,
			    unsigned int data_shndx,
			    Output_section* output_section,
			    const elfcpp::Rela<size, true>& reloc,
			    unsigned int r_type,
			    Symbol* gsym)
{
  // A STT_GNU_IFUNC symbol may require a PLT entry.
  if (gsym->type() == elfcpp::STT_GNU_IFUNC
      && this->reloc_needs_plt_for_ifunc(object, r_type))
    target->make_plt_entry(symtab, layout, gsym);

  switch (r_type)
    {
    case elfcpp::R_390_NONE:
    case elfcpp::R_390_GNU_VTINHERIT:
    case elfcpp::R_390_GNU_VTENTRY:
      break;

    case elfcpp::R_390_64:
    case elfcpp::R_390_32:
    case elfcpp::R_390_20:
    case elfcpp::R_390_16:
    case elfcpp::R_390_12:
    case elfcpp::R_390_8:
      {
	// Make a PLT entry if necessary.
	if (gsym->needs_plt_entry())
	  {
	    target->make_plt_entry(symtab, layout, gsym);
	    // Since this is not a PC-relative relocation, we may be
	    // taking the address of a function. In that case we need to
	    // set the entry in the dynamic symbol table to the address of
	    // the PLT entry.
	    if (gsym->is_from_dynobj() && !parameters->options().shared())
	      gsym->set_needs_dynsym_value();
	  }
	// Make a dynamic relocation if necessary.
	if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
	  {
	    if (!parameters->options().output_is_position_independent()
		&& gsym->may_need_copy_reloc())
	      {
		target->copy_reloc(symtab, layout, object,
				   data_shndx, output_section, gsym, reloc);
	      }
	    else if (((size == 64 && r_type == elfcpp::R_390_64)
		      || (size == 32 && r_type == elfcpp::R_390_32))
		     && gsym->type() == elfcpp::STT_GNU_IFUNC
		     && gsym->can_use_relative_reloc(false)
		     && !gsym->is_from_dynobj()
		     && !gsym->is_undefined()
		     && !gsym->is_preemptible())
	      {
		// Use an IRELATIVE reloc for a locally defined
		// STT_GNU_IFUNC symbol.  This makes a function
		// address in a PIE executable match the address in a
		// shared library that it links against.
		Reloc_section* rela_dyn =
		  target->rela_irelative_section(layout);
		unsigned int r_type = elfcpp::R_390_IRELATIVE;
		rela_dyn->add_symbolless_global_addend(gsym, r_type,
						       output_section, object,
						       data_shndx,
						       reloc.get_r_offset(),
						       reloc.get_r_addend());
	      }
	    else if (((size == 64 && r_type == elfcpp::R_390_64)
		      || (size == 32 && r_type == elfcpp::R_390_32))
		     && gsym->can_use_relative_reloc(false))
	      {
		Reloc_section* rela_dyn = target->rela_dyn_section(layout);
		rela_dyn->add_global_relative(gsym, elfcpp::R_390_RELATIVE,
					      output_section, object,
					      data_shndx,
					      reloc.get_r_offset(),
					      reloc.get_r_addend(), false);
	      }
	    else
	      {
		check_non_pic(object, r_type);
		Reloc_section* rela_dyn = target->rela_dyn_section(layout);
		rela_dyn->add_global(gsym, r_type, output_section, object,
				     data_shndx, reloc.get_r_offset(),
				     reloc.get_r_addend());
	      }
	  }
      }
      break;

    case elfcpp::R_390_PC12DBL:
    case elfcpp::R_390_PC16:
    case elfcpp::R_390_PC16DBL:
    case elfcpp::R_390_PC24DBL:
    case elfcpp::R_390_PC32:
    case elfcpp::R_390_PC32DBL:
    case elfcpp::R_390_PC64:
      {
	// Make a PLT entry if necessary.
	if (gsym->needs_plt_entry())
	  {
	    target->make_plt_entry(symtab, layout, gsym);
	    // larl is often used to take address of a function.  Aim the
	    // symbol at the PLT entry.
	    if (gsym->is_from_dynobj() && !parameters->options().shared())
	      gsym->set_needs_dynsym_value();
	  }
	// Make a dynamic relocation if necessary.
	if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
	  {
	    if (parameters->options().output_is_executable()
		&& gsym->may_need_copy_reloc())
	      {
		target->copy_reloc(symtab, layout, object,
				   data_shndx, output_section, gsym, reloc);
	      }
	    else
	      {
		check_non_pic(object, r_type);
		Reloc_section* rela_dyn = target->rela_dyn_section(layout);
		rela_dyn->add_global(gsym, r_type, output_section, object,
				     data_shndx, reloc.get_r_offset(),
				     reloc.get_r_addend());
	      }
	  }
      }
      break;

    case elfcpp::R_390_PLT12DBL:
    case elfcpp::R_390_PLT16DBL:
    case elfcpp::R_390_PLT24DBL:
    case elfcpp::R_390_PLT32:
    case elfcpp::R_390_PLT32DBL:
    case elfcpp::R_390_PLT64:
      // If the symbol is fully resolved, this is just a PC32 reloc.
      // Otherwise we need a PLT entry.
      if (gsym->final_value_is_known())
	break;
      // If building a shared library, we can also skip the PLT entry
      // if the symbol is defined in the output file and is protected
      // or hidden.
      if (gsym->is_defined()
	  && !gsym->is_from_dynobj()
	  && !gsym->is_preemptible())
	break;
      target->make_plt_entry(symtab, layout, gsym);
      break;

    case elfcpp::R_390_GOTPC:
    case elfcpp::R_390_GOTPCDBL:
    case elfcpp::R_390_GOTOFF16:
    case elfcpp::R_390_GOTOFF32:
    case elfcpp::R_390_GOTOFF64:
    case elfcpp::R_390_PLTOFF16:
    case elfcpp::R_390_PLTOFF32:
    case elfcpp::R_390_PLTOFF64:
      // We need a GOT section.
      target->got_section(symtab, layout);
      // For PLTOFF*, we also need a PLT entry (but only if the
      // symbol is not fully resolved).
      if ((r_type == elfcpp::R_390_PLTOFF16
           || r_type == elfcpp::R_390_PLTOFF32
	   || r_type == elfcpp::R_390_PLTOFF64)
	  && !gsym->final_value_is_known())
	target->make_plt_entry(symtab, layout, gsym);
      break;

    case elfcpp::R_390_GOT12:
    case elfcpp::R_390_GOT16:
    case elfcpp::R_390_GOT20:
    case elfcpp::R_390_GOT32:
    case elfcpp::R_390_GOT64:
    case elfcpp::R_390_GOTENT:
    case elfcpp::R_390_GOTPLT12:
    case elfcpp::R_390_GOTPLT16:
    case elfcpp::R_390_GOTPLT20:
    case elfcpp::R_390_GOTPLT32:
    case elfcpp::R_390_GOTPLT64:
    case elfcpp::R_390_GOTPLTENT:
      {
	// The symbol requires a GOT entry.
	Output_data_got<size, true>* got = target->got_section(symtab, layout);

	if (gsym->final_value_is_known())
	  {
	    // For a STT_GNU_IFUNC symbol we want the PLT address.
	    if (gsym->type() == elfcpp::STT_GNU_IFUNC)
	      got->add_global_plt(gsym, GOT_TYPE_STANDARD);
	    else
	      got->add_global(gsym, GOT_TYPE_STANDARD);
	  }
	else
	  {
	    // If this symbol is not fully resolved, we need to add a
	    // dynamic relocation for it.
	    Reloc_section* rela_dyn = target->rela_dyn_section(layout);

	    // Use a GLOB_DAT rather than a RELATIVE reloc if:
	    //
	    // 1) The symbol may be defined in some other module.
	    //
	    // 2) We are building a shared library and this is a
	    // protected symbol; using GLOB_DAT means that the dynamic
	    // linker can use the address of the PLT in the main
	    // executable when appropriate so that function address
	    // comparisons work.
	    //
	    // 3) This is a STT_GNU_IFUNC symbol in position dependent
	    // code, again so that function address comparisons work.
	    if (gsym->is_from_dynobj()
		|| gsym->is_undefined()
		|| gsym->is_preemptible()
		|| (gsym->visibility() == elfcpp::STV_PROTECTED
		    && parameters->options().shared())
		|| (gsym->type() == elfcpp::STT_GNU_IFUNC
		    && parameters->options().output_is_position_independent()))
	      got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn,
				       elfcpp::R_390_GLOB_DAT);
	    else
	      {
		// For a STT_GNU_IFUNC symbol we want to write the PLT
		// offset into the GOT, so that function pointer
		// comparisons work correctly.
		bool is_new;
		if (gsym->type() != elfcpp::STT_GNU_IFUNC)
		  is_new = got->add_global(gsym, GOT_TYPE_STANDARD);
		else
		  {
		    is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD);
		    // Tell the dynamic linker to use the PLT address
		    // when resolving relocations.
		    if (gsym->is_from_dynobj()
			&& !parameters->options().shared())
		      gsym->set_needs_dynsym_value();
		  }
		if (is_new)
		  {
		    unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD);
		    rela_dyn->add_global_relative(gsym,
						  elfcpp::R_390_RELATIVE,
						  got, got_off, 0, false);
		  }
	      }
	  }
      }
      break;

    case elfcpp::R_390_COPY:
    case elfcpp::R_390_GLOB_DAT:
    case elfcpp::R_390_JMP_SLOT:
    case elfcpp::R_390_RELATIVE:
    case elfcpp::R_390_IRELATIVE:
      // These are outstanding tls relocs, which are unexpected when linking
    case elfcpp::R_390_TLS_TPOFF:
    case elfcpp::R_390_TLS_DTPOFF:
    case elfcpp::R_390_TLS_DTPMOD:
      gold_error(_("%s: unexpected reloc %u in object file"),
		 object->name().c_str(), r_type);
      break;

      // These are initial tls relocs, which are expected for global()
    case elfcpp::R_390_TLS_GD32:          // Global-dynamic
    case elfcpp::R_390_TLS_GD64:
    case elfcpp::R_390_TLS_GDCALL:
    case elfcpp::R_390_TLS_LDM32:         // Local-dynamic
    case elfcpp::R_390_TLS_LDM64:
    case elfcpp::R_390_TLS_LDO32:
    case elfcpp::R_390_TLS_LDO64:
    case elfcpp::R_390_TLS_LDCALL:
    case elfcpp::R_390_TLS_IE32:          // Initial-exec
    case elfcpp::R_390_TLS_IE64:
    case elfcpp::R_390_TLS_IEENT:
    case elfcpp::R_390_TLS_GOTIE12:
    case elfcpp::R_390_TLS_GOTIE20:
    case elfcpp::R_390_TLS_GOTIE32:
    case elfcpp::R_390_TLS_GOTIE64:
    case elfcpp::R_390_TLS_LOAD:
    case elfcpp::R_390_TLS_LE32:          // Local-exec
    case elfcpp::R_390_TLS_LE64:
      {
	// For the optimizable Initial-Exec model, we can treat undef symbols
	// as final when building an executable.
	const bool is_final = (gsym->final_value_is_known() ||
			       ((r_type == elfcpp::R_390_TLS_IE32 ||
			         r_type == elfcpp::R_390_TLS_IE64 ||
			         r_type == elfcpp::R_390_TLS_GOTIE32 ||
			         r_type == elfcpp::R_390_TLS_GOTIE64) &&
			        gsym->is_undefined() &&
				parameters->options().output_is_executable()));
	const tls::Tls_optimization optimized_type
	    = Target_s390<size>::optimize_tls_reloc(is_final, r_type);
	switch (r_type)
	  {
	  case elfcpp::R_390_TLS_GD32:       // General-dynamic
	  case elfcpp::R_390_TLS_GD64:
	  case elfcpp::R_390_TLS_GDCALL:
	    if (optimized_type == tls::TLSOPT_NONE)
	      {
		// Create a pair of GOT entries for the module index and
		// dtv-relative offset.
		Output_data_got<size, true>* got
		    = target->got_section(symtab, layout);
		got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
					      target->rela_dyn_section(layout),
					      elfcpp::R_390_TLS_DTPMOD,
					      elfcpp::R_390_TLS_DTPOFF);
	      }
	    else if (optimized_type == tls::TLSOPT_TO_IE)
	      {
		// Create a GOT entry for the tp-relative offset.
		Output_data_got<size, true>* got
		    = target->got_section(symtab, layout);
		got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
					 target->rela_dyn_section(layout),
					 elfcpp::R_390_TLS_TPOFF);
	      }
	    else if (optimized_type != tls::TLSOPT_TO_LE)
	      unsupported_reloc_global(object, r_type, gsym);
	    break;

	  case elfcpp::R_390_TLS_LDM32:       // Local-dynamic
	  case elfcpp::R_390_TLS_LDM64:
	  case elfcpp::R_390_TLS_LDCALL:
	    if (optimized_type == tls::TLSOPT_NONE)
	      {
		// Create a GOT entry for the module index.
		target->got_mod_index_entry(symtab, layout, object);
	      }
	    else if (optimized_type != tls::TLSOPT_TO_LE)
	      unsupported_reloc_global(object, r_type, gsym);
	    break;

	  case elfcpp::R_390_TLS_LDO32:
	  case elfcpp::R_390_TLS_LDO64:
	    break;

	  case elfcpp::R_390_TLS_IE32:    // Initial-exec
	  case elfcpp::R_390_TLS_IE64:
	    // These two involve an absolute address
	    if (parameters->options().shared())
	      {
		if ((size == 32 && r_type == elfcpp::R_390_TLS_IE32) ||
		    (size == 64 && r_type == elfcpp::R_390_TLS_IE64))
		  {
		    // We need to create a dynamic relocation.
		    Reloc_section* rela_dyn = target->rela_dyn_section(layout);
		    rela_dyn->add_global_relative(gsym, elfcpp::R_390_RELATIVE,
						  output_section, object,
						  data_shndx,
						  reloc.get_r_offset(),
						  reloc.get_r_addend(), false);
		  }
		else
		  {
		    unsupported_reloc_global(object, r_type, gsym);
		  }
	      }
	    // fall through
	  case elfcpp::R_390_TLS_IEENT:
	  case elfcpp::R_390_TLS_GOTIE12:
	  case elfcpp::R_390_TLS_GOTIE20:
	  case elfcpp::R_390_TLS_GOTIE32:
	  case elfcpp::R_390_TLS_GOTIE64:
	  case elfcpp::R_390_TLS_LOAD:
	    layout->set_has_static_tls();
	    if (optimized_type == tls::TLSOPT_NONE)
	      {
		if (is_final && !parameters->options().shared())
		  {
		    // We're making an executable, and the symbol is local, but
		    // we cannot optimize to LE.  Make a const GOT entry instead.
		    Output_data_got<size, true>* got
			= target->got_section(symtab, layout);
		    got->add_global_plt(gsym, GOT_TYPE_TLS_OFFSET);
		  }
		else
		  {
		    // Create a GOT entry for the tp-relative offset.
		    Output_data_got<size, true>* got
			= target->got_section(symtab, layout);
		    got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
					     target->rela_dyn_section(layout),
					     elfcpp::R_390_TLS_TPOFF);
		  }
	      }
	    else if (optimized_type != tls::TLSOPT_TO_LE)
	      unsupported_reloc_global(object, r_type, gsym);
	    break;

	  case elfcpp::R_390_TLS_LE32:     // Local-exec
	  case elfcpp::R_390_TLS_LE64:
	    layout->set_has_static_tls();
	    if (parameters->options().shared())
	      {
		// We need to create a dynamic relocation.
		if ((size == 32 && r_type == elfcpp::R_390_TLS_LE32) ||
		    (size == 64 && r_type == elfcpp::R_390_TLS_LE64))
		  {
		    Reloc_section* rela_dyn = target->rela_dyn_section(layout);
		    rela_dyn->add_global(gsym, elfcpp::R_390_TLS_TPOFF,
					 output_section, object,
					 data_shndx, reloc.get_r_offset(),
					 reloc.get_r_addend());
		  }
		else
		  {
		    unsupported_reloc_global(object, r_type, gsym);
		  }
	      }
	    break;

	  default:
	    gold_unreachable();
	  }
      }
      break;

    default:
      gold_error(_("%s: unsupported reloc %u against global symbol %s"),
		 object->name().c_str(), r_type,
		 gsym->demangled_name().c_str());
      break;
    }
}


// Report an unsupported relocation against a global symbol.

template<int size>
void
Target_s390<size>::Scan::unsupported_reloc_global(
    Sized_relobj_file<size, true>* object,
    unsigned int r_type,
    Symbol* gsym)
{
  gold_error(_("%s: unsupported reloc %u against global symbol %s"),
	     object->name().c_str(), r_type, gsym->demangled_name().c_str());
}

// Returns true if this relocation type could be that of a function pointer.
template<int size>
inline bool
Target_s390<size>::Scan::possible_function_pointer_reloc(unsigned int r_type)
{
  switch (r_type)
    {
    case elfcpp::R_390_32:
    case elfcpp::R_390_64:
    case elfcpp::R_390_PC32DBL: // could be used by larl insn
    case elfcpp::R_390_GOT12:
    case elfcpp::R_390_GOT16:
    case elfcpp::R_390_GOT20:
    case elfcpp::R_390_GOT32:
    case elfcpp::R_390_GOT64:
    case elfcpp::R_390_GOTENT:
    case elfcpp::R_390_GOTOFF16:
    case elfcpp::R_390_GOTOFF32:
    case elfcpp::R_390_GOTOFF64:
      return true;
    }
  return false;
}

// For safe ICF, scan a relocation for a local symbol to check if it
// corresponds to a function pointer being taken.  In that case mark
// the function whose pointer was taken as not foldable.

template<int size>
inline bool
Target_s390<size>::Scan::local_reloc_may_be_function_pointer(
  Symbol_table* ,
  Layout* ,
  Target_s390<size>* ,
  Sized_relobj_file<size, true>* ,
  unsigned int ,
  Output_section* ,
  const elfcpp::Rela<size, true>& ,
  unsigned int r_type,
  const elfcpp::Sym<size, true>&)
{
  // When building a shared library, do not fold any local symbols.
  return (parameters->options().shared()
	  || possible_function_pointer_reloc(r_type));
}

// For safe ICF, scan a relocation for a global symbol to check if it
// corresponds to a function pointer being taken.  In that case mark
// the function whose pointer was taken as not foldable.

template<int size>
inline bool
Target_s390<size>::Scan::global_reloc_may_be_function_pointer(
  Symbol_table*,
  Layout* ,
  Target_s390<size>* ,
  Sized_relobj_file<size, true>* ,
  unsigned int ,
  Output_section* ,
  const elfcpp::Rela<size, true>& ,
  unsigned int r_type,
  Symbol* gsym)
{
  // When building a shared library, do not fold symbols whose visibility
  // is hidden, internal or protected.
  return ((parameters->options().shared()
	   && (gsym->visibility() == elfcpp::STV_INTERNAL
	       || gsym->visibility() == elfcpp::STV_PROTECTED
	       || gsym->visibility() == elfcpp::STV_HIDDEN))
	  || possible_function_pointer_reloc(r_type));
}

template<int size>
void
Target_s390<size>::gc_process_relocs(Symbol_table* symtab,
				       Layout* layout,
				       Sized_relobj_file<size, true>* object,
				       unsigned int data_shndx,
				       unsigned int sh_type,
				       const unsigned char* prelocs,
				       size_t reloc_count,
				       Output_section* output_section,
				       bool needs_special_offset_handling,
				       size_t local_symbol_count,
				       const unsigned char* plocal_symbols)
{
  typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, true>
      Classify_reloc;

  if (sh_type == elfcpp::SHT_REL)
    return;

  gold::gc_process_relocs<size, true, Target_s390<size>, Scan, Classify_reloc>(
    symtab,
    layout,
    this,
    object,
    data_shndx,
    prelocs,
    reloc_count,
    output_section,
    needs_special_offset_handling,
    local_symbol_count,
    plocal_symbols);
}

// Perform a relocation.

template<int size>
inline bool
Target_s390<size>::Relocate::relocate(
    const Relocate_info<size, true>* relinfo,
    unsigned int,
    Target_s390<size>* target,
    Output_section*,
    size_t relnum,
    const unsigned char* preloc,
    const Sized_symbol<size>* gsym,
    const Symbol_value<size>* psymval,
    unsigned char* view,
    typename elfcpp::Elf_types<size>::Elf_Addr address,
    section_size_type view_size)
{
  if (view == NULL)
    return true;

  const elfcpp::Rela<size, true> rela(preloc);
  unsigned int r_type = elfcpp::elf_r_type<size>(rela.get_r_info());
  const Sized_relobj_file<size, true>* object = relinfo->object;

  // Pick the value to use for symbols defined in the PLT.
  Symbol_value<size> symval;
  if (gsym != NULL
      && gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
    {
      symval.set_output_value(target->plt_address_for_global(gsym));
      psymval = &symval;
    }
  else if (gsym == NULL && psymval->is_ifunc_symbol())
    {
      unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
      if (object->local_has_plt_offset(r_sym))
	{
	  symval.set_output_value(target->plt_address_for_local(object, r_sym));
	  psymval = &symval;
	}
    }

  const elfcpp::Elf_Xword addend = rela.get_r_addend();

  typename elfcpp::Elf_types<size>::Elf_Addr value = 0;

  switch (r_type)
    {
    case elfcpp::R_390_PLT64:
    case elfcpp::R_390_PLT32:
    case elfcpp::R_390_PLT32DBL:
    case elfcpp::R_390_PLT24DBL:
    case elfcpp::R_390_PLT16DBL:
    case elfcpp::R_390_PLT12DBL:
      gold_assert(gsym == NULL
		  || gsym->has_plt_offset()
		  || gsym->final_value_is_known()
		  || (gsym->is_defined()
		      && !gsym->is_from_dynobj()
		      && !gsym->is_preemptible()));
      // fallthru
    case elfcpp::R_390_8:
    case elfcpp::R_390_12:
    case elfcpp::R_390_16:
    case elfcpp::R_390_20:
    case elfcpp::R_390_32:
    case elfcpp::R_390_64:
    case elfcpp::R_390_PC16:
    case elfcpp::R_390_PC32:
    case elfcpp::R_390_PC64:
    case elfcpp::R_390_PC32DBL:
    case elfcpp::R_390_PC24DBL:
    case elfcpp::R_390_PC16DBL:
    case elfcpp::R_390_PC12DBL:
      value = psymval->value(object, addend);
      break;

    case elfcpp::R_390_GOTPC:
    case elfcpp::R_390_GOTPCDBL:
      gold_assert(gsym != NULL);
      value = target->got_address() + addend;
      break;

    case elfcpp::R_390_PLTOFF64:
    case elfcpp::R_390_PLTOFF32:
    case elfcpp::R_390_PLTOFF16:
      gold_assert(gsym == NULL
		  || gsym->has_plt_offset()
		  || gsym->final_value_is_known());
      // fallthru
    case elfcpp::R_390_GOTOFF64:
    case elfcpp::R_390_GOTOFF32:
    case elfcpp::R_390_GOTOFF16:
      value = (psymval->value(object, addend)
	       - target->got_address());
      break;

    case elfcpp::R_390_GOT12:
    case elfcpp::R_390_GOT16:
    case elfcpp::R_390_GOT20:
    case elfcpp::R_390_GOT32:
    case elfcpp::R_390_GOT64:
    case elfcpp::R_390_GOTENT:
    case elfcpp::R_390_GOTPLT12:
    case elfcpp::R_390_GOTPLT16:
    case elfcpp::R_390_GOTPLT20:
    case elfcpp::R_390_GOTPLT32:
    case elfcpp::R_390_GOTPLT64:
    case elfcpp::R_390_GOTPLTENT:
      {
        unsigned int got_offset = 0;
        if (gsym != NULL)
	  {
	    gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
	    got_offset = gsym->got_offset(GOT_TYPE_STANDARD);
	  }
        else
	  {
	    unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
	    gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
	    got_offset = object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
	  }
        value = got_offset + target->got_main_offset() + addend;
      }
      break;

      // These are initial tls relocs, which are expected when linking
    case elfcpp::R_390_TLS_LOAD:
    case elfcpp::R_390_TLS_GDCALL:          // Global-dynamic
    case elfcpp::R_390_TLS_GD32:
    case elfcpp::R_390_TLS_GD64:
    case elfcpp::R_390_TLS_LDCALL:          // Local-dynamic
    case elfcpp::R_390_TLS_LDM32:
    case elfcpp::R_390_TLS_LDM64:
    case elfcpp::R_390_TLS_LDO32:
    case elfcpp::R_390_TLS_LDO64:
    case elfcpp::R_390_TLS_GOTIE12:         // Initial-exec
    case elfcpp::R_390_TLS_GOTIE20:
    case elfcpp::R_390_TLS_GOTIE32:
    case elfcpp::R_390_TLS_GOTIE64:
    case elfcpp::R_390_TLS_IE32:
    case elfcpp::R_390_TLS_IE64:
    case elfcpp::R_390_TLS_IEENT:
    case elfcpp::R_390_TLS_LE32:            // Local-exec
    case elfcpp::R_390_TLS_LE64:
      value = this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval,
			 view, view_size);
      break;

    default:
      break;
    }

  typename S390_relocate_functions<size>::Status status
      = S390_relocate_functions<size>::STATUS_OK;

  switch (r_type)
    {
    case elfcpp::R_390_NONE:
    case elfcpp::R_390_GNU_VTINHERIT:
    case elfcpp::R_390_GNU_VTENTRY:
    case elfcpp::R_390_TLS_GDCALL:
    case elfcpp::R_390_TLS_LDCALL:
    case elfcpp::R_390_TLS_LOAD:
      break;

    case elfcpp::R_390_64:
    case elfcpp::R_390_GOT64:
    case elfcpp::R_390_GOTPLT64:
    case elfcpp::R_390_PLTOFF64:
    case elfcpp::R_390_GOTOFF64:
    case elfcpp::R_390_TLS_GD64:
    case elfcpp::R_390_TLS_LDM64:
    case elfcpp::R_390_TLS_LDO64:
    case elfcpp::R_390_TLS_GOTIE64:
    case elfcpp::R_390_TLS_IE64:
    case elfcpp::R_390_TLS_LE64:
      Relocate_functions<size, true>::rela64(view, value, 0);
      break;

    case elfcpp::R_390_32:
    case elfcpp::R_390_GOT32:
    case elfcpp::R_390_GOTPLT32:
    case elfcpp::R_390_PLTOFF32:
    case elfcpp::R_390_GOTOFF32:
    case elfcpp::R_390_TLS_GD32:
    case elfcpp::R_390_TLS_LDM32:
    case elfcpp::R_390_TLS_LDO32:
    case elfcpp::R_390_TLS_GOTIE32:
    case elfcpp::R_390_TLS_IE32:
    case elfcpp::R_390_TLS_LE32:
      Relocate_functions<size, true>::rela32(view, value, 0);
      break;

    case elfcpp::R_390_20:
    case elfcpp::R_390_GOT20:
    case elfcpp::R_390_GOTPLT20:
    case elfcpp::R_390_TLS_GOTIE20:
      status = S390_relocate_functions<size>::rela20(view, value);
      break;

    case elfcpp::R_390_16:
    case elfcpp::R_390_GOT16:
    case elfcpp::R_390_GOTPLT16:
    case elfcpp::R_390_PLTOFF16:
    case elfcpp::R_390_GOTOFF16:
      status = S390_relocate_functions<size>::rela16(view, value);
      break;

    case elfcpp::R_390_12:
    case elfcpp::R_390_GOT12:
    case elfcpp::R_390_GOTPLT12:
    case elfcpp::R_390_TLS_GOTIE12:
      status = S390_relocate_functions<size>::rela12(view, value);
      break;

    case elfcpp::R_390_8:
      Relocate_functions<size, true>::rela8(view, value, 0);
      break;

    case elfcpp::R_390_PC16:
      Relocate_functions<size, true>::pcrela16(view, value, 0,
					       address);
      break;

    case elfcpp::R_390_PLT64:
    case elfcpp::R_390_PC64:
      Relocate_functions<size, true>::pcrela64(view, value, 0, address);
      break;

    case elfcpp::R_390_PLT32:
    case elfcpp::R_390_PC32:
    case elfcpp::R_390_GOTPC:
      Relocate_functions<size, true>::pcrela32(view, value, 0, address);
      break;

    case elfcpp::R_390_PLT32DBL:
    case elfcpp::R_390_PC32DBL:
    case elfcpp::R_390_GOTPCDBL:
      status = S390_relocate_functions<size>::pcrela32dbl(view, value, address);
      break;

    case elfcpp::R_390_PLT24DBL:
    case elfcpp::R_390_PC24DBL:
      status = S390_relocate_functions<size>::pcrela24dbl(view, value, address);
      break;

    case elfcpp::R_390_PLT16DBL:
    case elfcpp::R_390_PC16DBL:
      status = S390_relocate_functions<size>::pcrela16dbl(view, value, address);
      break;

    case elfcpp::R_390_PLT12DBL:
    case elfcpp::R_390_PC12DBL:
      status = S390_relocate_functions<size>::pcrela12dbl(view, value, address);
      break;

    case elfcpp::R_390_GOTENT:
    case elfcpp::R_390_GOTPLTENT:
    case elfcpp::R_390_TLS_IEENT:
      value += target->got_address();
      status = S390_relocate_functions<size>::pcrela32dbl(view, value, address);
      break;

    case elfcpp::R_390_COPY:
    case elfcpp::R_390_GLOB_DAT:
    case elfcpp::R_390_JMP_SLOT:
    case elfcpp::R_390_RELATIVE:
    case elfcpp::R_390_IRELATIVE:
      // These are outstanding tls relocs, which are unexpected when linking
    case elfcpp::R_390_TLS_TPOFF:
    case elfcpp::R_390_TLS_DTPMOD:
    case elfcpp::R_390_TLS_DTPOFF:
      gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
			     _("unexpected reloc %u in object file"),
			     r_type);
      break;

    default:
      gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
			     _("unsupported reloc %u"),
			     r_type);
      break;
    }

  if (status != S390_relocate_functions<size>::STATUS_OK)
    {
      gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
			     _("relocation overflow"));
    }

  return true;
}

// Perform a TLS relocation.

template<int size>
inline typename elfcpp::Elf_types<size>::Elf_Addr
Target_s390<size>::Relocate::relocate_tls(
    const Relocate_info<size, true>* relinfo,
    Target_s390<size>* target,
    size_t relnum,
    const elfcpp::Rela<size, true>& rela,
    unsigned int r_type,
    const Sized_symbol<size>* gsym,
    const Symbol_value<size>* psymval,
    unsigned char* view,
    section_size_type view_size)
{
  Output_segment* tls_segment = relinfo->layout->tls_segment();

  const Sized_relobj_file<size, true>* object = relinfo->object;
  const elfcpp::Elf_Xword addend = rela.get_r_addend();
  elfcpp::Shdr<size, true> data_shdr(relinfo->data_shdr);
  bool is_allocatable = (data_shdr.get_sh_flags() & elfcpp::SHF_ALLOC) != 0;

  typename elfcpp::Elf_types<size>::Elf_Addr value
      = psymval->value(relinfo->object, addend);

  const bool is_final = (gsym == NULL
			 ? !parameters->options().shared()
			 : gsym->final_value_is_known());
  tls::Tls_optimization optimized_type
      = Target_s390<size>::optimize_tls_reloc(is_final, r_type);
  switch (r_type)
    {
    case elfcpp::R_390_TLS_GDCALL:            // Global-dynamic marker
      if (optimized_type == tls::TLSOPT_TO_LE)
	{
	  if (tls_segment == NULL)
	    {
	      gold_assert(parameters->errors()->error_count() > 0
			  || issue_undefined_symbol_error(gsym));
	      return 0;
	    }
	  this->tls_gd_to_le(relinfo, relnum, rela, view, view_size);
	  break;
	}
      else
	{
	  if (optimized_type == tls::TLSOPT_TO_IE)
	    {
	      this->tls_gd_to_ie(relinfo, relnum, rela, view, view_size);
	      break;
	    }
	  else if (optimized_type == tls::TLSOPT_NONE)
	    {
	      break;
	    }
	}
      gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
			     _("unsupported reloc %u"), r_type);
      break;

    case elfcpp::R_390_TLS_GD32:            // Global-dynamic
    case elfcpp::R_390_TLS_GD64:
      if (optimized_type == tls::TLSOPT_TO_LE)
	{
	  if (tls_segment == NULL)
	    {
	      gold_assert(parameters->errors()->error_count() > 0
			  || issue_undefined_symbol_error(gsym));
	      return 0;
	    }
	  return value - tls_segment->memsz();
	}
      else
	{
	  unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
				   ? GOT_TYPE_TLS_OFFSET
				   : GOT_TYPE_TLS_PAIR);
	  if (gsym != NULL)
	    {
	      gold_assert(gsym->has_got_offset(got_type));
	      return (gsym->got_offset(got_type)
		      + target->got_main_offset()
		      + addend);
	    }
	  else
	    {
	      unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
	      gold_assert(object->local_has_got_offset(r_sym, got_type));
	      return (object->local_got_offset(r_sym, got_type)
		      + target->got_main_offset()
		      + addend);
	    }
	}
      gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
			     _("unsupported reloc %u"), r_type);
      break;

    case elfcpp::R_390_TLS_LDCALL:            // Local-dynamic marker
      // This is a marker relocation. If the sequence is being turned to LE,
      // we modify the instruction, otherwise the instruction is untouched.
      if (optimized_type == tls::TLSOPT_TO_LE)
	{
	  if (tls_segment == NULL)
	    {
	      gold_assert(parameters->errors()->error_count() > 0
			  || issue_undefined_symbol_error(gsym));
	      return 0;
	    }
	  this->tls_ld_to_le(relinfo, relnum, rela, view, view_size);
	  break;
	}
      else if (optimized_type == tls::TLSOPT_NONE)
	{
	  break;
	}
      gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
			     _("unsupported reloc %u"), r_type);
      break;

    case elfcpp::R_390_TLS_LDM32:            // Local-dynamic module
    case elfcpp::R_390_TLS_LDM64:
      if (optimized_type == tls::TLSOPT_TO_LE)
	{
	  if (tls_segment == NULL)
	    {
	      gold_assert(parameters->errors()->error_count() > 0
			  || issue_undefined_symbol_error(gsym));
	      return 0;
	    }
	  // Doesn't matter what we fill it with - it's going to be unused.
	  return 0;
	}
      else if (optimized_type == tls::TLSOPT_NONE)
	{
	  // Relocate the field with the offset of the GOT entry for
	  // the module index.
	  return (target->got_mod_index_entry(NULL, NULL, NULL)
		  + addend
		  + target->got_main_offset());
	}
      gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
			     _("unsupported reloc %u"), r_type);
      break;

    case elfcpp::R_390_TLS_LDO32:         // Local-dynamic offset
    case elfcpp::R_390_TLS_LDO64:
      // This relocation type is used in debugging information.
      // In that case we need to not optimize the value.  If the
      // section is not allocatable, then we assume we should not
      // optimize this reloc.
      if (optimized_type == tls::TLSOPT_TO_LE && is_allocatable)
	{
	  if (tls_segment == NULL)
	    {
	      gold_assert(parameters->errors()->error_count() > 0
			  || issue_undefined_symbol_error(gsym));
	      return 0;
	    }
	  value -= tls_segment->memsz();
	}
      return value;

    case elfcpp::R_390_TLS_LOAD:         // Initial-exec marker
      // This is a marker relocation. If the sequence is being turned to LE,
      // we modify the instruction, otherwise the instruction is untouched.
      if (gsym != NULL
	  && gsym->is_undefined()
	  && parameters->options().output_is_executable())
	{
	  Target_s390<size>::Relocate::tls_ie_to_le(relinfo, relnum,
						      rela, view,
						      view_size);
	  break;
	}
      else if (optimized_type == tls::TLSOPT_TO_LE)
	{
	  if (tls_segment == NULL)
	    {
	      gold_assert(parameters->errors()->error_count() > 0
			  || issue_undefined_symbol_error(gsym));
	      return 0;
	    }
	  Target_s390<size>::Relocate::tls_ie_to_le(relinfo, relnum,
						      rela, view,
						      view_size);
	  break;
	}
      else if (optimized_type == tls::TLSOPT_NONE)
	{
	  break;
	}
      gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
			     _("unsupported reloc type %u"),
			     r_type);
      break;

    case elfcpp::R_390_TLS_GOTIE12:       // Initial-exec, not optimizable
    case elfcpp::R_390_TLS_GOTIE20:
    case elfcpp::R_390_TLS_IEENT:
    case elfcpp::R_390_TLS_GOTIE32:       // Initial-exec, optimizable
    case elfcpp::R_390_TLS_GOTIE64:
    case elfcpp::R_390_TLS_IE32:
    case elfcpp::R_390_TLS_IE64:
      if (gsym != NULL
	  && gsym->is_undefined()
	  && parameters->options().output_is_executable()
	  // These three cannot be optimized to LE, no matter what
	  && r_type != elfcpp::R_390_TLS_GOTIE12
	  && r_type != elfcpp::R_390_TLS_GOTIE20
	  && r_type != elfcpp::R_390_TLS_IEENT)
	{
          return value;
	}
      else if (optimized_type == tls::TLSOPT_TO_LE)
	{
	  if (tls_segment == NULL)
	    {
	      gold_assert(parameters->errors()->error_count() > 0
			  || issue_undefined_symbol_error(gsym));
	      return 0;
	    }
          return value - tls_segment->memsz();
	}
      else if (optimized_type == tls::TLSOPT_NONE)
	{
	  // Relocate the field with the offset of the GOT entry for
	  // the tp-relative offset of the symbol.
	  unsigned int got_offset;
	  if (gsym != NULL)
	    {
	      gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET));
	      got_offset = gsym->got_offset(GOT_TYPE_TLS_OFFSET);
	    }
	  else
	    {
	      unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
	      gold_assert(object->local_has_got_offset(r_sym,
						       GOT_TYPE_TLS_OFFSET));
	      got_offset = object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET);
	    }
	  got_offset += target->got_main_offset();
	  if (r_type == elfcpp::R_390_TLS_IE32
	      || r_type == elfcpp::R_390_TLS_IE64)
	    return target->got_address() + got_offset + addend;
	  else
	    return got_offset + addend;
	}
      gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
			     _("unsupported reloc type %u"),
			     r_type);
      break;

    case elfcpp::R_390_TLS_LE32:          // Local-exec
    case elfcpp::R_390_TLS_LE64:
      if (tls_segment == NULL)
	{
	  gold_assert(parameters->errors()->error_count() > 0
		      || issue_undefined_symbol_error(gsym));
	  return 0;
	}
      return value - tls_segment->memsz();
    }
  return 0;
}

// Do a relocation in which we convert a TLS General-Dynamic to an
// Initial-Exec.

template<int size>
inline void
Target_s390<size>::Relocate::tls_gd_to_ie(
    const Relocate_info<size, true>* relinfo,
    size_t relnum,
    const elfcpp::Rela<size, true>& rela,
    unsigned char* view,
    section_size_type view_size)
{
  tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
  if (view[0] == 0x4d)
    {
      // bas, don't care about details
      // Change to l %r2, 0(%r2, %r12)
      view[0] = 0x58;
      view[1] = 0x22;
      view[2] = 0xc0;
      view[3] = 0x00;
      return;
    }
  else if (view[0] == 0xc0)
    {
      tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 6);
      // brasl %r14, __tls_get_offset@plt
      if (view[1] == 0xe5)
	{
	  // Change to l/lg %r2, 0(%r2, %r12)
	  // There was a PLT32DBL reloc at the last 4 bytes, overwrite its result.
	  if (size == 32)
	    {
	      // l
	      view[0] = 0x58;
	      view[1] = 0x22;
	      view[2] = 0xc0;
	      view[3] = 0x00;
	      // nop
	      view[4] = 0x07;
	      view[5] = 0x07;
	    }
	  else
	    {
	      // lg
	      view[0] = 0xe3;
	      view[1] = 0x22;
	      view[2] = 0xc0;
	      view[3] = 0;
	      view[4] = 0;
	      view[5] = 0x04;
	    }
	  return;
	}
    }
  gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
			 _("unsupported op for GD to IE"));
}

// Do a relocation in which we convert a TLS General-Dynamic to a
// Local-Exec.

template<int size>
inline void
Target_s390<size>::Relocate::tls_gd_to_le(
    const Relocate_info<size, true>* relinfo,
    size_t relnum,
    const elfcpp::Rela<size, true>& rela,
    unsigned char* view,
    section_size_type view_size)
{
  tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
  if (view[0] == 0x0d)
    {
      // basr, change to nop
      view[0] = 0x07;
      view[1] = 0x07;
    }
  else if (view[0] == 0x4d)
    {
      tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
      // bas, don't care about details, change to nop
      view[0] = 0x47;
      view[1] = 0;
      view[2] = 0;
      view[3] = 0;
      return;
    }
  else if (view[0] == 0xc0)
    {
      tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 6);
      // brasl %r14, __tls_get_offset@plt
      if (view[1] == 0xe5)
	{
	  // Change to nop jump. There was a PLT32DBL reloc at the last
	  // 4 bytes, overwrite its result.
	  view[1] = 0x04;
	  view[2] = 0;
	  view[3] = 0;
	  view[4] = 0;
	  view[5] = 0;
	  return;
	}
    }
  gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
			 _("unsupported op for GD to LE"));
}

template<int size>
inline void
Target_s390<size>::Relocate::tls_ld_to_le(
    const Relocate_info<size, true>* relinfo,
    size_t relnum,
    const elfcpp::Rela<size, true>& rela,
    unsigned char* view,
    section_size_type view_size)
{
  tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);

  if (view[0] == 0x0d)
    {
      // basr, change to nop
      view[0] = 0x07;
      view[1] = 0x07;
    }
  else if (view[0] == 0x4d)
    {
      // bas, don't care about details, change to nop
      view[0] = 0x47;
      view[1] = 0;
      view[2] = 0;
      view[3] = 0;
      return;
    }
  else if (view[0] == 0xc0)
    {
      tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 6);
      // brasl %r14, __tls_get_offset@plt
      if (view[1] == 0xe5)
	{
	  // Change to nop jump. There was a PLT32DBL reloc at the last
	  // 4 bytes, overwrite its result.
	  view[1] = 0x04;
	  view[2] = 0;
	  view[3] = 0;
	  view[4] = 0;
	  view[5] = 0;
	  return;
	}
    }
  gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
			 _("unsupported op for LD to LE"));
}

// Do a relocation in which we convert a TLS Initial-Exec to a
// Local-Exec.

template<int size>
inline void
Target_s390<size>::Relocate::tls_ie_to_le(
    const Relocate_info<size, true>* relinfo,
    size_t relnum,
    const elfcpp::Rela<size, true>& rela,
    unsigned char* view,
    section_size_type view_size)
{
  tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);

  if (view[0] == 0x58)
    {
      // l %rX, 0(%rY) or l %rX, 0(%rY, %r12)
      if ((view[2] & 0x0f) != 0 || view[3] != 0)
	goto err;
      int rx = view[1] >> 4 & 0xf;
      int ry = view[1] & 0xf;
      int rz = view[2] >> 4 & 0xf;
      if (rz == 0)
	{
	}
      else if (ry == 0)
	{
	  ry = rz;
	}
      else if (rz == 12)
	{
	}
      else if (ry == 12)
	{
	  ry = rz;
	}
      else
	goto err;
      // to lr %rX, $rY
      view[0] = 0x18;
      view[1] = rx << 4 | ry;
      // and insert a nop
      view[2] = 0x07;
      view[3] = 0x00;
    }
  else if (view[0] == 0xe3)
    {
      tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 6);
      // lg %rX, 0(%rY) or lg %rX, 0(%rY, %r12)
      if ((view[2] & 0x0f) != 0 ||
	  view[3] != 0 ||
	  view[4] != 0 ||
	  view[5] != 0x04)
	goto err;
      int rx = view[1] >> 4 & 0xf;
      int ry = view[1] & 0xf;
      int rz = view[2] >> 4 & 0xf;
      if (rz == 0)
	{
	}
      else if (ry == 0)
	{
	  ry = rz;
	}
      else if (rz == 12)
	{
	}
      else if (ry == 12)
	{
	  ry = rz;
	}
      else
	goto err;
      // to sllg %rX, $rY, 0
      view[0] = 0xeb;
      view[1] = rx << 4 | ry;
      view[2] = 0x00;
      view[3] = 0x00;
      view[4] = 0x00;
      view[5] = 0x0d;
    }
  else
    {
err:
      gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
			     _("unsupported op for IE to LE"));
    }
}

// Scan relocations for a section.

template<int size>
void
Target_s390<size>::scan_relocs(Symbol_table* symtab,
				 Layout* layout,
				 Sized_relobj_file<size, true>* object,
				 unsigned int data_shndx,
				 unsigned int sh_type,
				 const unsigned char* prelocs,
				 size_t reloc_count,
				 Output_section* output_section,
				 bool needs_special_offset_handling,
				 size_t local_symbol_count,
				 const unsigned char* plocal_symbols)
{
  typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, true>
      Classify_reloc;

  if (sh_type == elfcpp::SHT_REL)
    {
      gold_error(_("%s: unsupported REL reloc section"),
		 object->name().c_str());
      return;
    }

  gold::scan_relocs<size, true, Target_s390<size>, Scan, Classify_reloc>(
    symtab,
    layout,
    this,
    object,
    data_shndx,
    prelocs,
    reloc_count,
    output_section,
    needs_special_offset_handling,
    local_symbol_count,
    plocal_symbols);
}

// Finalize the sections.

template<int size>
void
Target_s390<size>::do_finalize_sections(
    Layout* layout,
    const Input_objects*,
    Symbol_table* symtab)
{
  const Reloc_section* rel_plt = (this->plt_ == NULL
				  ? NULL
				  : this->plt_->rela_plt());
  layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt,
				  this->rela_dyn_, true, size == 32);

  this->layout_ = layout;

  // Emit any relocs we saved in an attempt to avoid generating COPY
  // relocs.
  if (this->copy_relocs_.any_saved_relocs())
    this->copy_relocs_.emit(this->rela_dyn_section(layout));

  // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
  // the .got section.
  Symbol* sym = this->global_offset_table_;
  if (sym != NULL)
    {
      uint64_t data_size = this->got_->current_data_size();
      symtab->get_sized_symbol<size>(sym)->set_symsize(data_size);
    }

  if (parameters->doing_static_link()
      && (this->plt_ == NULL || !this->plt_->has_irelative_section()))
    {
      // If linking statically, make sure that the __rela_iplt symbols
      // were defined if necessary, even if we didn't create a PLT.
      static const Define_symbol_in_segment syms[] =
	{
	  {
	    "__rela_iplt_start",	// name
	    elfcpp::PT_LOAD,		// segment_type
	    elfcpp::PF_W,		// segment_flags_set
	    elfcpp::PF(0),		// segment_flags_clear
	    0,				// value
	    0,				// size
	    elfcpp::STT_NOTYPE,		// type
	    elfcpp::STB_GLOBAL,		// binding
	    elfcpp::STV_HIDDEN,		// visibility
	    0,				// nonvis
	    Symbol::SEGMENT_START,	// offset_from_base
	    true			// only_if_ref
	  },
	  {
	    "__rela_iplt_end",		// name
	    elfcpp::PT_LOAD,		// segment_type
	    elfcpp::PF_W,		// segment_flags_set
	    elfcpp::PF(0),		// segment_flags_clear
	    0,				// value
	    0,				// size
	    elfcpp::STT_NOTYPE,		// type
	    elfcpp::STB_GLOBAL,		// binding
	    elfcpp::STV_HIDDEN,		// visibility
	    0,				// nonvis
	    Symbol::SEGMENT_START,	// offset_from_base
	    true			// only_if_ref
	  }
	};

      symtab->define_symbols(layout, 2, syms,
			     layout->script_options()->saw_sections_clause());
    }
}

// Scan the relocs during a relocatable link.

template<int size>
void
Target_s390<size>::scan_relocatable_relocs(
    Symbol_table* symtab,
    Layout* layout,
    Sized_relobj_file<size, true>* object,
    unsigned int data_shndx,
    unsigned int sh_type,
    const unsigned char* prelocs,
    size_t reloc_count,
    Output_section* output_section,
    bool needs_special_offset_handling,
    size_t local_symbol_count,
    const unsigned char* plocal_symbols,
    Relocatable_relocs* rr)
{
  typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, true>
      Classify_reloc;
  typedef gold::Default_scan_relocatable_relocs<Classify_reloc>
      Scan_relocatable_relocs;

  gold_assert(sh_type == elfcpp::SHT_RELA);

  gold::scan_relocatable_relocs<size, true, Scan_relocatable_relocs>(
    symtab,
    layout,
    object,
    data_shndx,
    prelocs,
    reloc_count,
    output_section,
    needs_special_offset_handling,
    local_symbol_count,
    plocal_symbols,
    rr);
}

// Scan the relocs for --emit-relocs.

template<int size>
void
Target_s390<size>::emit_relocs_scan(
    Symbol_table* symtab,
    Layout* layout,
    Sized_relobj_file<size, true>* object,
    unsigned int data_shndx,
    unsigned int sh_type,
    const unsigned char* prelocs,
    size_t reloc_count,
    Output_section* output_section,
    bool needs_special_offset_handling,
    size_t local_symbol_count,
    const unsigned char* plocal_syms,
    Relocatable_relocs* rr)
{
  typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, true>
      Classify_reloc;
  typedef gold::Default_emit_relocs_strategy<Classify_reloc>
      Emit_relocs_strategy;

  gold_assert(sh_type == elfcpp::SHT_RELA);

  gold::scan_relocatable_relocs<size, true, Emit_relocs_strategy>(
    symtab,
    layout,
    object,
    data_shndx,
    prelocs,
    reloc_count,
    output_section,
    needs_special_offset_handling,
    local_symbol_count,
    plocal_syms,
    rr);
}

// Relocate a section during a relocatable link.

template<int size>
void
Target_s390<size>::relocate_relocs(
    const Relocate_info<size, true>* relinfo,
    unsigned int sh_type,
    const unsigned char* prelocs,
    size_t reloc_count,
    Output_section* output_section,
    typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
    unsigned char* view,
    typename elfcpp::Elf_types<size>::Elf_Addr view_address,
    section_size_type view_size,
    unsigned char* reloc_view,
    section_size_type reloc_view_size)
{
  typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, true>
      Classify_reloc;

  gold_assert(sh_type == elfcpp::SHT_RELA);

  gold::relocate_relocs<size, true, Classify_reloc>(
    relinfo,
    prelocs,
    reloc_count,
    output_section,
    offset_in_output_section,
    view,
    view_address,
    view_size,
    reloc_view,
    reloc_view_size);
}

// Return the offset to use for the GOT_INDX'th got entry which is
// for a local tls symbol specified by OBJECT, SYMNDX.
template<int size>
int64_t
Target_s390<size>::do_tls_offset_for_local(
    const Relobj*,
    unsigned int,
    unsigned int) const
{
  // The only way we can get called is when IEENT/GOTIE12/GOTIE20
  // couldn't be optimised to LE.
  Output_segment* tls_segment = layout_->tls_segment();
  return -tls_segment->memsz();
}

// Return the offset to use for the GOT_INDX'th got entry which is
// for global tls symbol GSYM.
template<int size>
int64_t
Target_s390<size>::do_tls_offset_for_global(
    Symbol*,
    unsigned int) const
{
  Output_segment* tls_segment = layout_->tls_segment();
  return -tls_segment->memsz();
}

// Return the value to use for a dynamic which requires special
// treatment.  This is how we support equality comparisons of function
// pointers across shared library boundaries, as described in the
// processor specific ABI supplement.

template<int size>
uint64_t
Target_s390<size>::do_dynsym_value(const Symbol* gsym) const
{
  gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
  return this->plt_address_for_global(gsym);
}

// Return a string used to fill a code section with nops to take up
// the specified length.

template<int size>
std::string
Target_s390<size>::do_code_fill(section_size_type length) const
{
  if (length & 1)
    gold_warning(_("S/390 code fill of odd length requested"));
  return std::string(length, static_cast<char>(0x07));
}

// Return whether SYM should be treated as a call to a non-split
// function.  We don't want that to be true of a larl instruction
// that merely loads its address.

template<int size>
bool
Target_s390<size>::do_is_call_to_non_split(const Symbol* sym,
					   const unsigned char* preloc,
					   const unsigned char* view,
					   section_size_type view_size) const
{
  if (sym->type() != elfcpp::STT_FUNC)
    return false;
  typename Reloc_types<elfcpp::SHT_RELA, size, true>::Reloc reloc(preloc);
  typename elfcpp::Elf_types<size>::Elf_WXword r_info
    = reloc.get_r_info();
  unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
  section_offset_type offset = reloc.get_r_offset();
  switch (r_type)
    {
    // PLT refs always involve calling the function.
    case elfcpp::R_390_PLT12DBL:
    case elfcpp::R_390_PLT16DBL:
    case elfcpp::R_390_PLT24DBL:
    case elfcpp::R_390_PLT32:
    case elfcpp::R_390_PLT32DBL:
    case elfcpp::R_390_PLT64:
    case elfcpp::R_390_PLTOFF16:
    case elfcpp::R_390_PLTOFF32:
    case elfcpp::R_390_PLTOFF64:
    // Could be used for calls for -msmall-exec.
    case elfcpp::R_390_PC16DBL:
      return true;

    // Tricky case.  When used in a brasl, jg, and other branch instructions,
    // it's a call or a sibcall.  However, when used in larl, it only loads
    // the function's address - not a call.
    case elfcpp::R_390_PC32DBL:
      {
	if (offset < 2
	    || offset + 4 > static_cast<section_offset_type>(view_size))
	  {
	    // Should not happen.
	    gold_error(_("instruction with PC32DBL not wholly within section"));
	    return false;
	  }

	uint8_t op0 = view[offset-2];
	uint8_t op1 = view[offset-1] & 0xf;

	// LARL
	if (op0 == 0xc0 && op1 == 0)
	  return false;

	// Otherwise, it's either a call instruction, a branch instruction
	// (used as a sibcall), or a data manipulation instruction (which
	// has no business being used on a function, and can be ignored).
        return true;
      }

    // Otherwise, it's probably not a call.
    default:
      return false;
    }
}

// Code sequences to match below.

template<int size>
const unsigned char
Target_s390<size>::ss_code_bras_8[] = {
  0xa7, 0x15, 0x00, 0x06,		// bras %r1, .+0xc
};

template<int size>
const unsigned char
Target_s390<size>::ss_code_l_basr[] = {
  0x58, 0xe0, 0x10, 0x00,		// l %r14, 0(%r1)
  0x58, 0x10, 0x10, 0x04,		// l %r1, 4(%r1)
  0x0d, 0xee,				// basr %r14, %r14
};

template<int size>
const unsigned char
Target_s390<size>::ss_code_a_basr[] = {
  0x18, 0xe1,				// lr %r14, %r1
  0x5a, 0xe0, 0x10, 0x00,		// a %r14, 0(%r1)
  0x5a, 0x10, 0x10, 0x04,		// a %r1, 4(%r1)
  0x0d, 0xee,				// basr %r14, %r14
};

template<int size>
const unsigned char
Target_s390<size>::ss_code_larl[] = {
  0xc0, 0x10,				// larl %r1, ...
};

template<int size>
const unsigned char
Target_s390<size>::ss_code_brasl[] = {
  0xc0, 0xe5,				// brasl %r14, ...
};

template<int size>
const unsigned char
Target_s390<size>::ss_code_jg[] = {
  0xc0, 0xf4,				// jg ...
};

template<int size>
const unsigned char
Target_s390<size>::ss_code_jgl[] = {
  0xc0, 0x44,				// jgl ...
};

template<>
bool
Target_s390<32>::ss_match_st_r14(unsigned char* view,
				 section_size_type view_size,
				 section_offset_type *offset) const
{
  static const unsigned char ss_code_st_r14[] = {
    0x50, 0xe0, 0xf0, 0x04,		// st %r14, 4(%r15)
  };
  if (!this->match_view_u(view, view_size, *offset, ss_code_st_r14,
			  sizeof ss_code_st_r14))
    return false;
  *offset += sizeof ss_code_st_r14;
  return true;
}

template<>
bool
Target_s390<64>::ss_match_st_r14(unsigned char* view,
				 section_size_type view_size,
				 section_offset_type *offset) const
{
  static const unsigned char ss_code_st_r14[] = {
    0xe3, 0xe0, 0xf0, 0x08, 0x00, 0x24	// stg %r14, 8(%r15)
  };
  if (!this->match_view_u(view, view_size, *offset, ss_code_st_r14,
			  sizeof ss_code_st_r14))
    return false;
  *offset += sizeof ss_code_st_r14;
  return true;
}

template<>
bool
Target_s390<32>::ss_match_l_r14(unsigned char* view,
				section_size_type view_size,
				section_offset_type *offset) const
{
  static const unsigned char ss_code_l_r14[] = {
    0x58, 0xe0, 0xf0, 0x04,		// l %r14, 4(%r15)
  };
  if (!this->match_view_u(view, view_size, *offset, ss_code_l_r14,
			  sizeof ss_code_l_r14))
    return false;
  *offset += sizeof ss_code_l_r14;
  return true;
}

template<>
bool
Target_s390<64>::ss_match_l_r14(unsigned char* view,
				section_size_type view_size,
				section_offset_type *offset) const
{
  static const unsigned char ss_code_l_r14[] = {
    0xe3, 0xe0, 0xf0, 0x08, 0x00, 0x04	// lg %r14, 8(%r15)
  };
  if (!this->match_view_u(view, view_size, *offset, ss_code_l_r14,
			  sizeof ss_code_l_r14))
    return false;
  *offset += sizeof ss_code_l_r14;
  return true;
}

template<int size>
bool
Target_s390<size>::ss_match_mcount(unsigned char* view,
				   section_size_type view_size,
				   section_offset_type *offset) const
{
  // Match the mcount call sequence.
  section_offset_type myoff = *offset;

  // First, look for the store instruction saving %r14.
  if (!this->ss_match_st_r14(view, view_size, &myoff))
    return false;

  // Now, param load and the actual call.
  if (this->match_view_u(view, view_size, myoff, ss_code_larl,
			 sizeof ss_code_larl))
    {
      myoff += sizeof ss_code_larl + 4;

      // After larl, expect a brasl.
      if (!this->match_view_u(view, view_size, myoff, ss_code_brasl,
			      sizeof ss_code_brasl))
	return false;
      myoff += sizeof ss_code_brasl + 4;
    }
  else if (size == 32 &&
	   this->match_view_u(view, view_size, myoff, ss_code_bras_8,
			      sizeof ss_code_bras_8))
    {
      // The bras skips over a block of 8 bytes, loading its address
      // to %r1.
      myoff += sizeof ss_code_bras_8 + 8;

      // Now, there are two sequences used for actual load and call,
      // absolute and PIC.
      if (this->match_view_u(view, view_size, myoff, ss_code_l_basr,
			     sizeof ss_code_l_basr))
        myoff += sizeof ss_code_l_basr;
      else if (this->match_view_u(view, view_size, myoff, ss_code_a_basr,
				  sizeof ss_code_a_basr))
        myoff += sizeof ss_code_a_basr;
      else
	return false;
    }
  else
    return false;

  // Finally, a load bringing %r14 back.
  if (!this->ss_match_l_r14(view, view_size, &myoff))
    return false;

  // Found it.
  *offset = myoff;
  return true;
}

template<>
bool
Target_s390<32>::ss_match_ear(unsigned char* view,
				section_size_type view_size,
				section_offset_type *offset) const
{
  static const unsigned char ss_code_ear[] = {
    0xb2, 0x4f, 0x00, 0x10,		// ear %r1, %a0
  };
  if (!this->match_view_u(view, view_size, *offset, ss_code_ear,
			  sizeof ss_code_ear))
    return false;
  *offset += sizeof ss_code_ear;
  return true;
}

template<>
bool
Target_s390<64>::ss_match_ear(unsigned char* view,
				section_size_type view_size,
				section_offset_type *offset) const
{
  static const unsigned char ss_code_ear[] = {
    0xb2, 0x4f, 0x00, 0x10,		// ear %r1, %a0
    0xeb, 0x11, 0x00, 0x20, 0x00, 0x0d,	// sllg %r1,%r1,32
    0xb2, 0x4f, 0x00, 0x11,		// ear %r1, %a1
  };
  if (!this->match_view_u(view, view_size, *offset, ss_code_ear,
			  sizeof ss_code_ear))
    return false;
  *offset += sizeof ss_code_ear;
  return true;
}

template<>
bool
Target_s390<32>::ss_match_c(unsigned char* view,
				section_size_type view_size,
				section_offset_type *offset) const
{
  static const unsigned char ss_code_c[] = {
    0x59, 0xf0, 0x10, 0x20,		// c %r15, 0x20(%r1)
  };
  if (!this->match_view_u(view, view_size, *offset, ss_code_c,
			  sizeof ss_code_c))
    return false;
  *offset += sizeof ss_code_c;
  return true;
}

template<>
bool
Target_s390<64>::ss_match_c(unsigned char* view,
				section_size_type view_size,
				section_offset_type *offset) const
{
  static const unsigned char ss_code_c[] = {
    0xe3, 0xf0, 0x10, 0x38, 0x00, 0x20,	// cg %r15, 0x38(%r1)
  };
  if (!this->match_view_u(view, view_size, *offset, ss_code_c,
			  sizeof ss_code_c))
    return false;
  *offset += sizeof ss_code_c;
  return true;
}

template<>
bool
Target_s390<32>::ss_match_l(unsigned char* view,
			    section_size_type view_size,
			    section_offset_type *offset,
			    int *guard_reg) const
{
  // l %guard_reg, 0x20(%r1)
  if (convert_to_section_size_type(*offset + 4) > view_size
      || view[*offset] != 0x58
      || (view[*offset + 1] & 0xf) != 0x0
      || view[*offset + 2] != 0x10
      || view[*offset + 3] != 0x20)
    return false;
  *offset += 4;
  *guard_reg = view[*offset + 1] >> 4 & 0xf;
  return true;
}

template<>
bool
Target_s390<64>::ss_match_l(unsigned char* view,
			    section_size_type view_size,
			    section_offset_type *offset,
			    int *guard_reg) const
{
  // lg %guard_reg, 0x38(%r1)
  if (convert_to_section_size_type(*offset + 6) > view_size
      || view[*offset] != 0xe3
      || (view[*offset + 1] & 0xf) != 0x0
      || view[*offset + 2] != 0x10
      || view[*offset + 3] != 0x38
      || view[*offset + 4] != 0x00
      || view[*offset + 5] != 0x04)
    return false;
  *offset += 6;
  *guard_reg = view[*offset + 1] >> 4 & 0xf;
  return true;
}

template<int size>
bool
Target_s390<size>::ss_match_ahi(unsigned char* view,
				section_size_type view_size,
				section_offset_type *offset,
				int guard_reg,
				uint32_t *arg) const
{
  int op = size == 32 ? 0xa : 0xb;
  // a[g]hi %guard_reg, <arg>
  if (convert_to_section_size_type(*offset + 4) > view_size
      || view[*offset] != 0xa7
      || view[*offset + 1] != (guard_reg << 4 | op)
      // Disallow negative size.
      || view[*offset + 2] & 0x80)
    return false;
  *arg = elfcpp::Swap<16, true>::readval(view + *offset + 2);
  *offset += 4;
  return true;
}

template<int size>
bool
Target_s390<size>::ss_match_alfi(unsigned char* view,
				 section_size_type view_size,
				 section_offset_type *offset,
				 int guard_reg,
				 uint32_t *arg) const
{
  int op = size == 32 ? 0xb : 0xa;
  // al[g]fi %guard_reg, <arg>
  if (convert_to_section_size_type(*offset + 6) > view_size
      || view[*offset] != 0xc2
      || view[*offset + 1] != (guard_reg << 4 | op))
    return false;
  *arg = elfcpp::Swap<32, true>::readval(view + *offset + 2);
  *offset += 6;
  return true;
}

template<>
bool
Target_s390<32>::ss_match_cr(unsigned char* view,
			     section_size_type view_size,
			     section_offset_type *offset,
			     int guard_reg) const
{
  // cr %r15, %guard_reg
  if (convert_to_section_size_type(*offset + 2) > view_size
      || view[*offset] != 0x19
      || view[*offset + 1] != (0xf0 | guard_reg))
    return false;
  *offset += 2;
  return true;
}

template<>
bool
Target_s390<64>::ss_match_cr(unsigned char* view,
			     section_size_type view_size,
			     section_offset_type *offset,
			     int guard_reg) const
{
  // cgr %r15, %guard_reg
  if (convert_to_section_size_type(*offset + 4) > view_size
      || view[*offset] != 0xb9
      || view[*offset + 1] != 0x20
      || view[*offset + 2] != 0x00
      || view[*offset + 3] != (0xf0 | guard_reg))
    return false;
  *offset += 4;
  return true;
}


// FNOFFSET in section SHNDX in OBJECT is the start of a function
// compiled with -fsplit-stack.  The function calls non-split-stack
// code.  We have to change the function so that it always ensures
// that it has enough stack space to run some random function.

template<int size>
void
Target_s390<size>::do_calls_non_split(Relobj* object, unsigned int shndx,
				      section_offset_type fnoffset,
				      section_size_type,
				      const unsigned char *prelocs,
				      size_t reloc_count,
				      unsigned char* view,
				      section_size_type view_size,
				      std::string*,
				      std::string*) const
{
  // true if there's a conditional call to __morestack in the function,
  // false if there's an unconditional one.
  bool conditional = false;
  // Offset of the byte after the compare insn, if conditional.
  section_offset_type cmpend = 0;
  // Type and immediate offset of the add instruction that adds frame size
  // to guard.
  enum {
    SS_ADD_NONE,
    SS_ADD_AHI,
    SS_ADD_ALFI,
  } fsadd_type = SS_ADD_NONE;
  section_offset_type fsadd_offset = 0;
  uint32_t fsadd_frame_size = 0;
  // Register used for loading guard.  Usually r1, but can also be r0 or r2-r5.
  int guard_reg;
  // Offset of the conditional jump.
  section_offset_type jump_offset = 0;
  // Section view and offset of param block.
  section_offset_type param_offset = 0;
  unsigned char *param_view = 0;
  section_size_type param_view_size = 0;
  // Current position in function.
  section_offset_type curoffset = fnoffset;
  // And the position of split-stack prologue.
  section_offset_type ssoffset;
  // Frame size.
  typename elfcpp::Elf_types<size>::Elf_Addr frame_size;
  // Relocation parsing.
  typedef typename Reloc_types<elfcpp::SHT_RELA, size, true>::Reloc Reltype;
  const int reloc_size = Reloc_types<elfcpp::SHT_RELA, size, true>::reloc_size;
  const unsigned char *pr = prelocs;

  // If the function was compiled with -pg, the profiling code may come before
  // the split-stack prologue.  Skip it.

  this->ss_match_mcount(view, view_size, &curoffset);
  ssoffset = curoffset;

  // First, figure out if there's a conditional call by looking for the
  // extract-tp, add, cmp sequence.

  if (this->ss_match_ear(view, view_size, &curoffset))
    {
      // Found extract-tp, now look for an add and compare.
      conditional = true;
      if (this->ss_match_c(view, view_size, &curoffset))
	{
	  // Found a direct compare of stack pointer with the guard,
	  // we're done here.
	}
      else if (this->ss_match_l(view, view_size, &curoffset, &guard_reg))
	{
	  // Found a load of guard to register, look for an add and compare.
          if (this->ss_match_ahi(view, view_size, &curoffset, guard_reg,
				 &fsadd_frame_size))
	    {
	      fsadd_type = SS_ADD_AHI;
	      fsadd_offset = curoffset - 2;
	    }
	  else if (this->ss_match_alfi(view, view_size, &curoffset, guard_reg,
				       &fsadd_frame_size))
	    {
	      fsadd_type = SS_ADD_ALFI;
	      fsadd_offset = curoffset - 4;
	    }
	  else
            {
	      goto bad;
            }
	  // Now, there has to be a compare.
          if (!this->ss_match_cr(view, view_size, &curoffset, guard_reg))
	    goto bad;
	}
      else
        {
	  goto bad;
        }
      cmpend = curoffset;
    }

  // Second, look for the call.
  if (!this->match_view_u(view, view_size, curoffset, ss_code_larl,
			  sizeof ss_code_larl))
    goto bad;
  curoffset += sizeof ss_code_larl;

  // Find out larl's operand.  It should be a local symbol in .rodata
  // section.
  for (size_t i = 0; i < reloc_count; ++i, pr += reloc_size)
    {
      Reltype reloc(pr);
      if (static_cast<section_offset_type>(reloc.get_r_offset())
          == curoffset)
        {
          typename elfcpp::Elf_types<size>::Elf_WXword r_info
            = reloc.get_r_info();
          unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
          unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
          if (r_type != elfcpp::R_390_PC32DBL)
            goto bad;
          if (r_sym >= object->local_symbol_count())
            goto bad;
          Sized_relobj_file<size, true> *object_sized =
            static_cast<Sized_relobj_file<size, true> *>(object);
          const Symbol_value<size>* sym = object_sized->local_symbol(r_sym);
          bool param_shndx_ordinary;
          const unsigned int param_shndx =
            sym->input_shndx(&param_shndx_ordinary);
          if (!param_shndx_ordinary)
            goto bad;
          param_offset = sym->input_value() + reloc.get_r_addend() - 2
                         - object->output_section(param_shndx)->address()
                         - object->output_section_offset(param_shndx);
          param_view = object->get_output_view(param_shndx,
                                                  &param_view_size);
          break;
        }
    }

  if (!param_view)
    goto bad;

  curoffset += 4;

  // Now, there has to be a jump to __morestack.
  jump_offset = curoffset;

  if (this->match_view_u(view, view_size, curoffset,
                       conditional ? ss_code_jgl : ss_code_jg,
                       sizeof ss_code_jg))
    curoffset += sizeof ss_code_jg;
  else
    goto bad;

  curoffset += 4;

  // Read the frame size.
  if (convert_to_section_size_type(param_offset + size / 8) > param_view_size)
    goto bad;
  frame_size = elfcpp::Swap<size, true>::readval(param_view + param_offset);

  // Sanity check.
  if (fsadd_type != SS_ADD_NONE && fsadd_frame_size != frame_size)
    goto bad;

  // Bump the frame size.
  frame_size += parameters->options().split_stack_adjust_size();

  // Store it to the param block.
  elfcpp::Swap<size, true>::writeval(param_view + param_offset, frame_size);

  if (!conditional)
    {
      // If the call was already unconditional, we're done.
    }
  else if (frame_size <= 0xffffffff && fsadd_type == SS_ADD_ALFI)
    {
      // Using alfi to add the frame size, and it still fits.  Adjust it.
      elfcpp::Swap_unaligned<32, true>::writeval(view + fsadd_offset,
						 frame_size);
    }
  else
    {
      // We were either relying on the backoff area, or used ahi to load
      // frame size.  This won't fly, as our new frame size is too large.
      // Convert the sequence to unconditional by nopping out the comparison,
      // and rewiring the jump.
      this->set_view_to_nop(view, view_size, ssoffset, cmpend - ssoffset);

      // The jump is jgl, we'll mutate it to jg.
      view[jump_offset+1] = 0xf4;
    }

  return;

bad:
  if (!object->has_no_split_stack())
      object->error(_("failed to match split-stack sequence at "
		      "section %u offset %0zx"),
		    shndx, static_cast<size_t>(fnoffset));
}

// Relocate section data.

template<int size>
void
Target_s390<size>::relocate_section(
    const Relocate_info<size, true>* relinfo,
    unsigned int sh_type,
    const unsigned char* prelocs,
    size_t reloc_count,
    Output_section* output_section,
    bool needs_special_offset_handling,
    unsigned char* view,
    typename elfcpp::Elf_types<size>::Elf_Addr address,
    section_size_type view_size,
    const Reloc_symbol_changes* reloc_symbol_changes)
{
  typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, true>
      Classify_reloc;

  gold_assert(sh_type == elfcpp::SHT_RELA);

  gold::relocate_section<size, true, Target_s390<size>, Relocate,
			 gold::Default_comdat_behavior, Classify_reloc>(
    relinfo,
    this,
    prelocs,
    reloc_count,
    output_section,
    needs_special_offset_handling,
    view,
    address,
    view_size,
    reloc_symbol_changes);
}

// Apply an incremental relocation.  Incremental relocations always refer
// to global symbols.

template<int size>
void
Target_s390<size>::apply_relocation(
    const Relocate_info<size, true>* relinfo,
    typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
    unsigned int r_type,
    typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
    const Symbol* gsym,
    unsigned char* view,
    typename elfcpp::Elf_types<size>::Elf_Addr address,
    section_size_type view_size)
{
  gold::apply_relocation<size, true, Target_s390<size>,
			 typename Target_s390<size>::Relocate>(
    relinfo,
    this,
    r_offset,
    r_type,
    r_addend,
    gsym,
    view,
    address,
    view_size);
}

// The selector for s390 object files.

template<int size>
class Target_selector_s390 : public Target_selector
{
public:
  Target_selector_s390()
    : Target_selector(elfcpp::EM_S390, size, true,
		      (size == 64 ? "elf64-s390" : "elf32-s390"),
		      (size == 64 ? "elf64_s390" : "elf32_s390"))
  { }

  virtual Target*
  do_instantiate_target()
  { return new Target_s390<size>(); }
};

Target_selector_s390<32> target_selector_s390;
Target_selector_s390<64> target_selector_s390x;

} // End anonymous namespace.