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
|
# This shell script emits a C file. -*- C -*-
# It does some substitutions.
fragment <<EOF
/* This file is is generated by a shell script. DO NOT EDIT! */
/* Emulate the original gld for the given ${EMULATION_NAME}
Copyright (C) 2014-2023 Free Software Foundation, Inc.
Written by Steve Chamberlain steve@cygnus.com
Extended for the MSP430 by Nick Clifton nickc@redhat.com
This file is part of the GNU Binutils.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#define TARGET_IS_${EMULATION_NAME}
#include "sysdep.h"
#include "bfd.h"
#include "bfdlink.h"
#include "ctf-api.h"
#include "ld.h"
#include "getopt.h"
#include "ldmain.h"
#include "ldmisc.h"
#include "ldexp.h"
#include "ldlang.h"
#include "ldfile.h"
#include "ldemul.h"
#include "libiberty.h"
#include <ldgram.h>
enum regions
{
REGION_NONE = 0,
REGION_LOWER,
REGION_UPPER,
REGION_EITHER = 3,
};
enum either_placement_stage
{
LOWER_TO_UPPER,
UPPER_TO_LOWER,
};
enum { ROM, RAM };
static int data_region = REGION_NONE;
static int code_region = REGION_NONE;
static bool disable_sec_transformation = false;
#define MAX_PREFIX_LENGTH 7
EOF
# Import any needed special functions and/or overrides.
#
if test -n "$EXTRA_EM_FILE" ; then
source_em ${srcdir}/emultempl/${EXTRA_EM_FILE}.em
fi
if test x"$LDEMUL_BEFORE_PARSE" != xgld"$EMULATION_NAME"_before_parse; then
fragment <<EOF
static void
gld${EMULATION_NAME}_before_parse (void)
{
#ifndef TARGET_ /* I.e., if not generic. */
ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
#endif /* not TARGET_ */
/* The MSP430 port *needs* linker relaxtion in order to cope with large
functions where conditional branches do not fit into a +/- 1024 byte range. */
if (!bfd_link_relocatable (&link_info))
TARGET_ENABLE_RELAXATION;
}
EOF
fi
if test x"$LDEMUL_GET_SCRIPT" != xgld"$EMULATION_NAME"_get_script; then
fragment <<EOF
static char *
gld${EMULATION_NAME}_get_script (int *isfile)
EOF
if test x"$COMPILE_IN" = xyes
then
# Scripts compiled in.
# sed commands to quote an ld script as a C string.
sc="-f ${srcdir}/emultempl/stringify.sed"
fragment <<EOF
{
*isfile = 0;
if (bfd_link_relocatable (&link_info) && config.build_constructors)
return
EOF
sed $sc ldscripts/${EMULATION_NAME}.xu >> e${EMULATION_NAME}.c
echo ' ; else if (bfd_link_relocatable (&link_info)) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xr >> e${EMULATION_NAME}.c
echo ' ; else if (!config.text_read_only) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xbn >> e${EMULATION_NAME}.c
echo ' ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xn >> e${EMULATION_NAME}.c
echo ' ; else return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.x >> e${EMULATION_NAME}.c
echo '; }' >> e${EMULATION_NAME}.c
else
# Scripts read from the filesystem.
fragment <<EOF
{
*isfile = 1;
if (bfd_link_relocatable (&link_info) && config.build_constructors)
return "ldscripts/${EMULATION_NAME}.xu";
else if (bfd_link_relocatable (&link_info))
return "ldscripts/${EMULATION_NAME}.xr";
else if (!config.text_read_only)
return "ldscripts/${EMULATION_NAME}.xbn";
else if (!config.magic_demand_paged)
return "ldscripts/${EMULATION_NAME}.xn";
else
return "ldscripts/${EMULATION_NAME}.x";
}
EOF
fi
fi
if test x"$LDEMUL_PLACE_ORPHAN" != xgld"$EMULATION_NAME"_place_orphan; then
fragment <<EOF
static unsigned int
data_statement_size (lang_data_statement_type *d)
{
unsigned int size = 0;
switch (d->type)
{
case QUAD:
case SQUAD:
size = QUAD_SIZE;
break;
case LONG:
size = LONG_SIZE;
break;
case SHORT:
size = SHORT_SIZE;
break;
case BYTE:
size = BYTE_SIZE;
break;
default:
einfo (_("%P: error: unhandled data_statement size\n"));
FAIL ();
}
return size;
}
/* Helper function for place_orphan that computes the size
of sections already mapped to the given statement. */
static bfd_size_type
scan_children (lang_statement_union_type * l)
{
bfd_size_type amount = 0;
while (l != NULL)
{
switch (l->header.type)
{
case lang_input_section_enum:
if (l->input_section.section->flags & SEC_ALLOC)
amount += l->input_section.section->size;
break;
case lang_constructors_statement_enum:
case lang_assignment_statement_enum:
case lang_padding_statement_enum:
break;
case lang_wild_statement_enum:
amount += scan_children (l->wild_statement.children.head);
break;
case lang_data_statement_enum:
amount += data_statement_size (&l->data_statement);
break;
default:
fprintf (stderr, "msp430 orphan placer: unhandled lang type %d\n", l->header.type);
break;
}
l = l->header.next;
}
return amount;
}
#define WARN_UPPER 0
#define WARN_LOWER 1
#define WARN_TEXT 0
#define WARN_DATA 1
#define WARN_BSS 2
#define WARN_RODATA 3
/* Warn only once per output section.
* NAME starts with ".upper." or ".lower.". */
static void
warn_no_output_section (const char *name)
{
static bool warned[2][4] = {{false, false, false, false},
{false, false, false, false}};
int i = WARN_LOWER;
if (strncmp (name, ".upper.", 7) == 0)
i = WARN_UPPER;
if (!warned[i][WARN_TEXT] && strcmp (name + 6, ".text") == 0)
warned[i][WARN_TEXT] = true;
else if (!warned[i][WARN_DATA] && strcmp (name + 6, ".data") == 0)
warned[i][WARN_DATA] = true;
else if (!warned[i][WARN_BSS] && strcmp (name + 6, ".bss") == 0)
warned[i][WARN_BSS] = true;
else if (!warned[i][WARN_RODATA] && strcmp (name + 6, ".rodata") == 0)
warned[i][WARN_RODATA] = true;
else
return;
einfo ("%P: warning: no input section rule matches %s in linker script\n",
name);
}
/* Place an orphan section. We use this to put .either sections
into either their lower or their upper equivalents. */
static lang_output_section_statement_type *
gld${EMULATION_NAME}_place_orphan (asection * s,
const char * secname,
int constraint)
{
char * lower_name;
char * upper_name;
char * name;
lang_output_section_statement_type * lower;
lang_output_section_statement_type * upper;
if ((s->flags & SEC_ALLOC) == 0)
return NULL;
if (bfd_link_relocatable (&link_info))
return NULL;
/* If constraints are involved let the linker handle the placement normally. */
if (constraint != 0)
return NULL;
if (strncmp (secname, ".upper.", 7) == 0
|| strncmp (secname, ".lower.", 7) == 0)
{
warn_no_output_section (secname);
return NULL;
}
/* We only need special handling for .either sections. */
if (strncmp (secname, ".either.", 8) != 0)
return NULL;
/* Skip the .either prefix. */
secname += 7;
/* Compute the names of the corresponding upper and lower
sections. If the input section name contains another period,
only use the part of the name before the second dot. */
if (strchr (secname + 1, '.') != NULL)
{
name = xstrdup (secname);
* strchr (name + 1, '.') = 0;
}
else
name = (char *) secname;
lower_name = concat (".lower", name, NULL);
upper_name = concat (".upper", name, NULL);
/* Find the corresponding lower and upper sections. */
lower = lang_output_section_find (lower_name);
upper = lang_output_section_find (upper_name);
if (lower == NULL && upper == NULL)
{
einfo (_("%P: error: no section named %s or %s in linker script\n"),
lower_name, upper_name);
goto end;
}
else if (lower == NULL)
{
lower = lang_output_section_find (name);
if (lower == NULL)
{
einfo (_("%P: error: no section named %s in linker script\n"), name);
goto end;
}
}
/* Always place orphaned sections in lower. Optimal placement of either
sections is performed later, once section sizes have been finalized. */
lang_add_section (& lower->children, s, NULL, NULL, lower);
end:
free (upper_name);
free (lower_name);
return lower;
}
EOF
fi
fragment <<EOF
static bool
change_output_section (lang_statement_union_type **head,
asection *s,
lang_output_section_statement_type *new_os,
lang_output_section_statement_type *old_os)
{
asection *is;
lang_statement_union_type * prev = NULL;
lang_statement_union_type * curr;
curr = *head;
while (curr != NULL)
{
switch (curr->header.type)
{
case lang_input_section_enum:
is = curr->input_section.section;
if (is == s)
{
lang_statement_list_type *old_list
= (lang_statement_list_type *) &old_os->children;
s->output_section = NULL;
lang_add_section (&new_os->children, s,
curr->input_section.pattern, NULL, new_os);
/* Remove the section from the old output section. */
if (prev == NULL)
*head = curr->header.next;
else
prev->header.next = curr->header.next;
/* If the input section we just moved is the tail of the old
output section, then we also need to adjust that tail. */
if (old_list->tail == (lang_statement_union_type **) curr)
old_list->tail = (lang_statement_union_type **) prev;
return true;
}
break;
case lang_wild_statement_enum:
if (change_output_section (&(curr->wild_statement.children.head),
s, new_os, old_os))
return true;
break;
default:
break;
}
prev = curr;
curr = curr->header.next;
}
return false;
}
static void
add_region_prefix (bfd *abfd ATTRIBUTE_UNUSED, asection *s,
void *unused ATTRIBUTE_UNUSED)
{
const char *curr_name = bfd_section_name (s);
int region = REGION_NONE;
if (strncmp (curr_name, ".text", 5) == 0)
region = code_region;
else if (strncmp (curr_name, ".data", 5) == 0)
region = data_region;
else if (strncmp (curr_name, ".bss", 4) == 0)
region = data_region;
else if (strncmp (curr_name, ".rodata", 7) == 0)
region = data_region;
else
return;
switch (region)
{
case REGION_NONE:
break;
case REGION_UPPER:
bfd_rename_section (s, concat (".upper", curr_name, NULL));
break;
case REGION_LOWER:
bfd_rename_section (s, concat (".lower", curr_name, NULL));
break;
case REGION_EITHER:
bfd_rename_section (s, concat (".either", curr_name, NULL));
break;
default:
/* Unreachable. */
FAIL ();
break;
}
}
static void
msp430_elf_after_open (void)
{
bfd *abfd;
gld${EMULATION_NAME}_after_open ();
/* If neither --code-region or --data-region have been passed, do not
transform sections names. */
if ((code_region == REGION_NONE && data_region == REGION_NONE)
|| disable_sec_transformation)
return;
for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link.next)
bfd_map_over_sections (abfd, add_region_prefix, NULL);
}
#define OPTION_CODE_REGION 321
#define OPTION_DATA_REGION (OPTION_CODE_REGION + 1)
#define OPTION_DISABLE_TRANS (OPTION_CODE_REGION + 2)
static void
gld${EMULATION_NAME}_add_options
(int ns, char **shortopts, int nl, struct option **longopts,
int nrl ATTRIBUTE_UNUSED, struct option **really_longopts ATTRIBUTE_UNUSED)
{
static const char xtra_short[] = { };
static const struct option xtra_long[] =
{
{ "code-region", required_argument, NULL, OPTION_CODE_REGION },
{ "data-region", required_argument, NULL, OPTION_DATA_REGION },
{ "disable-sec-transformation", no_argument, NULL,
OPTION_DISABLE_TRANS },
{ NULL, no_argument, NULL, 0 }
};
*shortopts = (char *) xrealloc (*shortopts, ns + sizeof (xtra_short));
memcpy (*shortopts + ns, &xtra_short, sizeof (xtra_short));
*longopts = (struct option *)
xrealloc (*longopts, nl * sizeof (struct option) + sizeof (xtra_long));
memcpy (*longopts + nl, &xtra_long, sizeof (xtra_long));
}
static void
gld${EMULATION_NAME}_list_options (FILE * file)
{
fprintf (file, _(" --code-region={either,lower,upper,none}\n\
Transform .text* sections to {either,lower,upper,none}.text* sections\n"));
fprintf (file, _(" --data-region={either,lower,upper,none}\n\
Transform .data*, .rodata* and .bss* sections to\n\
{either,lower,upper,none}.{bss,data,rodata}* sections\n"));
fprintf (file, _(" --disable-sec-transformation\n\
Disable transformation of .{text,data,bss,rodata}* sections to\n\
add the {either,lower,upper,none} prefixes\n"));
}
static bool
gld${EMULATION_NAME}_handle_option (int optc)
{
switch (optc)
{
case OPTION_CODE_REGION:
if (strcmp (optarg, "upper") == 0)
code_region = REGION_UPPER;
else if (strcmp (optarg, "lower") == 0)
code_region = REGION_LOWER;
else if (strcmp (optarg, "either") == 0)
code_region = REGION_EITHER;
else if (strcmp (optarg, "none") == 0)
code_region = REGION_NONE;
else if (strlen (optarg) == 0)
{
einfo (_("%P: --code-region requires an argument: "
"{upper,lower,either,none}\n"));
return false;
}
else
{
einfo (_("%P: error: unrecognized argument to --code-region= option: "
"\"%s\"\n"), optarg);
return false;
}
break;
case OPTION_DATA_REGION:
if (strcmp (optarg, "upper") == 0)
data_region = REGION_UPPER;
else if (strcmp (optarg, "lower") == 0)
data_region = REGION_LOWER;
else if (strcmp (optarg, "either") == 0)
data_region = REGION_EITHER;
else if (strcmp (optarg, "none") == 0)
data_region = REGION_NONE;
else if (strlen (optarg) == 0)
{
einfo (_("%P: --data-region requires an argument: "
"{upper,lower,either,none}\n"));
return false;
}
else
{
einfo (_("%P: error: unrecognized argument to --data-region= option: "
"\"%s\"\n"), optarg);
return false;
}
break;
case OPTION_DISABLE_TRANS:
disable_sec_transformation = true;
break;
default:
return false;
}
return true;
}
static void
eval_upper_either_sections (bfd *abfd ATTRIBUTE_UNUSED,
asection *s, void *data)
{
const char * base_sec_name;
const char * curr_name;
char * either_name;
int curr_region;
lang_output_section_statement_type * lower;
lang_output_section_statement_type * upper;
static bfd_size_type *lower_size = 0;
static bfd_size_type *upper_size = 0;
static bfd_size_type lower_size_rom = 0;
static bfd_size_type lower_size_ram = 0;
static bfd_size_type upper_size_rom = 0;
static bfd_size_type upper_size_ram = 0;
if ((s->flags & SEC_ALLOC) == 0)
return;
if (bfd_link_relocatable (&link_info))
return;
base_sec_name = (const char *) data;
curr_name = bfd_section_name (s);
/* Only concerned with .either input sections in the upper output section. */
either_name = concat (".either", base_sec_name, NULL);
if (strncmp (curr_name, either_name, strlen (either_name)) != 0
|| strncmp (s->output_section->name, ".upper", 6) != 0)
goto end;
lower = lang_output_section_find (concat (".lower", base_sec_name, NULL));
upper = lang_output_section_find (concat (".upper", base_sec_name, NULL));
if (upper == NULL || upper->region == NULL)
goto end;
else if (lower == NULL)
lower = lang_output_section_find (base_sec_name);
if (lower == NULL || lower->region == NULL)
goto end;
if (strcmp (base_sec_name, ".text") == 0
|| strcmp (base_sec_name, ".rodata") == 0)
curr_region = ROM;
else
curr_region = RAM;
if (curr_region == ROM)
{
if (lower_size_rom == 0)
{
lower_size_rom = lower->region->current - lower->region->origin;
upper_size_rom = upper->region->current - upper->region->origin;
}
lower_size = &lower_size_rom;
upper_size = &upper_size_rom;
}
else if (curr_region == RAM)
{
if (lower_size_ram == 0)
{
lower_size_ram = lower->region->current - lower->region->origin;
upper_size_ram = upper->region->current - upper->region->origin;
}
lower_size = &lower_size_ram;
upper_size = &upper_size_ram;
}
/* If the upper region is overflowing, try moving sections to the lower
region.
Note that there isn't any general benefit to using lower memory over upper
memory, so we only move sections around with the goal of making the program
fit. */
if (*upper_size > upper->region->length
&& *lower_size + s->size < lower->region->length)
{
if (change_output_section (&(upper->children.head), s, lower, upper))
{
*upper_size -= s->size;
*lower_size += s->size;
}
}
end:
free (either_name);
}
static void
eval_lower_either_sections (bfd *abfd ATTRIBUTE_UNUSED,
asection *s, void *data)
{
const char * base_sec_name;
const char * curr_name;
char * either_name;
int curr_region;
lang_output_section_statement_type * output_sec;
lang_output_section_statement_type * lower;
lang_output_section_statement_type * upper;
static bfd_size_type *lower_size = 0;
static bfd_size_type lower_size_rom = 0;
static bfd_size_type lower_size_ram = 0;
if ((s->flags & SEC_ALLOC) == 0)
return;
if (bfd_link_relocatable (&link_info))
return;
base_sec_name = (const char *) data;
curr_name = bfd_section_name (s);
/* Only concerned with .either input sections in the lower or "default"
output section i.e. not in the upper output section. */
either_name = concat (".either", base_sec_name, NULL);
if (strncmp (curr_name, either_name, strlen (either_name)) != 0
|| strncmp (s->output_section->name, ".upper", 6) == 0)
return;
if (strcmp (base_sec_name, ".text") == 0
|| strcmp (base_sec_name, ".rodata") == 0)
curr_region = ROM;
else
curr_region = RAM;
output_sec = lang_output_section_find (s->output_section->name);
/* If the output_section doesn't exist, this has already been reported in
place_orphan, so don't need to warn again. */
if (output_sec == NULL || output_sec->region == NULL)
goto end;
/* lower and output_sec might be the same, but in some cases an .either
section can end up in base_sec_name if it hasn't been placed by
place_orphan. */
lower = lang_output_section_find (concat (".lower", base_sec_name, NULL));
upper = lang_output_section_find (concat (".upper", base_sec_name, NULL));
if (upper == NULL)
goto end;
if (curr_region == ROM)
{
if (lower_size_rom == 0)
{
/* Get the size of other items in the lower region that aren't the
sections to be moved around. */
lower_size_rom
= (output_sec->region->current - output_sec->region->origin)
- scan_children (output_sec->children.head);
if (output_sec != lower && lower != NULL)
lower_size_rom -= scan_children (lower->children.head);
}
lower_size = &lower_size_rom;
}
else if (curr_region == RAM)
{
if (lower_size_ram == 0)
{
lower_size_ram
= (output_sec->region->current - output_sec->region->origin)
- scan_children (output_sec->children.head);
if (output_sec != lower && lower != NULL)
lower_size_ram -= scan_children (lower->children.head);
}
lower_size = &lower_size_ram;
}
/* Move sections that cause the lower region to overflow to the upper region. */
if (*lower_size + s->size > output_sec->region->length)
change_output_section (&(output_sec->children.head), s, upper, output_sec);
else
*lower_size += s->size;
end:
free (either_name);
}
/* This function is similar to lang_relax_sections, but without the size
evaluation code that is always executed after relaxation. */
static void
intermediate_relax_sections (void)
{
int i = link_info.relax_pass;
/* The backend can use it to determine the current pass. */
link_info.relax_pass = 0;
while (i--)
{
bool relax_again;
link_info.relax_trip = -1;
do
{
link_info.relax_trip++;
lang_do_assignments (lang_assigning_phase_enum);
lang_reset_memory_regions ();
relax_again = false;
lang_size_sections (&relax_again, false);
}
while (relax_again);
link_info.relax_pass++;
}
}
static void
msp430_elf_after_allocation (void)
{
int relax_count = 0;
unsigned int i;
/* Go over each section twice, once to place either sections that don't fit
in lower into upper, and then again to move any sections in upper that
fit in lower into lower. */
for (i = 0; i < 8; i++)
{
int placement_stage = (i < 4) ? LOWER_TO_UPPER : UPPER_TO_LOWER;
const char * base_sec_name;
lang_output_section_statement_type * upper;
switch (i % 4)
{
default:
case 0:
base_sec_name = ".text";
break;
case 1:
base_sec_name = ".data";
break;
case 2:
base_sec_name = ".bss";
break;
case 3:
base_sec_name = ".rodata";
break;
}
upper = lang_output_section_find (concat (".upper", base_sec_name, NULL));
if (upper != NULL)
{
/* Can't just use one iteration over the all the sections to make
both lower->upper and upper->lower transformations because the
iterator encounters upper sections before all lower sections have
been examined. */
bfd *abfd;
if (placement_stage == LOWER_TO_UPPER)
{
/* Perform relaxation and get the final size of sections
before trying to fit .either sections in the correct
ouput sections. */
if (relax_count == 0)
{
intermediate_relax_sections ();
relax_count++;
}
for (abfd = link_info.input_bfds; abfd != NULL;
abfd = abfd->link.next)
{
bfd_map_over_sections (abfd, eval_lower_either_sections,
(void *) base_sec_name);
}
}
else if (placement_stage == UPPER_TO_LOWER)
{
/* Relax again before moving upper->lower. */
if (relax_count == 1)
{
intermediate_relax_sections ();
relax_count++;
}
for (abfd = link_info.input_bfds; abfd != NULL;
abfd = abfd->link.next)
{
bfd_map_over_sections (abfd, eval_upper_either_sections,
(void *) base_sec_name);
}
}
}
}
gld${EMULATION_NAME}_after_allocation ();
}
/* Return TRUE if a non-debug input section in L has positive size and matches
the given name. */
static int
input_section_exists (lang_statement_union_type * l, const char * name)
{
while (l != NULL)
{
switch (l->header.type)
{
case lang_input_section_enum:
if ((l->input_section.section->flags & SEC_ALLOC)
&& l->input_section.section->size > 0
&& !strcmp (l->input_section.section->name, name))
return true;
break;
case lang_wild_statement_enum:
if (input_section_exists (l->wild_statement.children.head, name))
return true;
break;
default:
break;
}
l = l->header.next;
}
return false;
}
/* Some MSP430 linker scripts do not include ALIGN directives to ensure
__preinit_array_start, __init_array_start or __fini_array_start are word
aligned.
If __*_array_start symbols are not word aligned, the code in crt0 to run
through the array and call the functions will crash.
To avoid warning unnecessarily when the .*_array sections are not being
used for running constructors/destructors, only emit the warning if
the associated section exists and has size. */
static void
check_array_section_alignment (void)
{
int i;
lang_output_section_statement_type * rodata_sec;
lang_output_section_statement_type * rodata2_sec;
const char * array_names[3][2] = { { ".init_array", "__init_array_start" },
{ ".preinit_array", "__preinit_array_start" },
{ ".fini_array", "__fini_array_start" } };
/* .{preinit,init,fini}_array could be in either .rodata or .rodata2. */
rodata_sec = lang_output_section_find (".rodata");
rodata2_sec = lang_output_section_find (".rodata2");
if (rodata_sec == NULL && rodata2_sec == NULL)
return;
/* There are 3 .*_array sections which must be checked for alignment. */
for (i = 0; i < 3; i++)
{
struct bfd_link_hash_entry * sym;
if (((rodata_sec && input_section_exists (rodata_sec->children.head,
array_names[i][0]))
|| (rodata2_sec && input_section_exists (rodata2_sec->children.head,
array_names[i][0])))
&& (sym = bfd_link_hash_lookup (link_info.hash, array_names[i][1],
false, false, true))
&& sym->type == bfd_link_hash_defined
&& sym->u.def.value % 2)
{
einfo ("%P: warning: \"%s\" symbol (%pU) is not word aligned\n",
array_names[i][1], NULL);
}
}
}
static void
gld${EMULATION_NAME}_finish (void)
{
finish_default ();
check_array_section_alignment ();
}
EOF
LDEMUL_AFTER_OPEN=msp430_elf_after_open
LDEMUL_AFTER_ALLOCATION=msp430_elf_after_allocation
LDEMUL_PLACE_ORPHAN=${LDEMUL_PLACE_ORPHAN-gld${EMULATION_NAME}_place_orphan}
LDEMUL_FINISH=gld${EMULATION_NAME}_finish
LDEMUL_ADD_OPTIONS=gld${EMULATION_NAME}_add_options
LDEMUL_HANDLE_OPTION=gld${EMULATION_NAME}_handle_option
LDEMUL_LIST_OPTIONS=gld${EMULATION_NAME}_list_options
source_em ${srcdir}/emultempl/emulation.em
#
# Local Variables:
# mode: c
# End:
|