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
|
/* Main simulator entry points specific to the CRIS.
Copyright (C) 2004-2023 Free Software Foundation, Inc.
Contributed by Axis Communications.
This file is part of the GNU simulators.
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, see <http://www.gnu.org/licenses/>. */
/* Based on the fr30 file, mixing in bits from the i960 and pruning of
dead code. */
/* This must come before any other includes. */
#include "defs.h"
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include "libiberty.h"
#include "bfd.h"
#include "bfd/elf-bfd.h"
#include "sim/callback.h"
#include "sim-main.h"
#include "sim-options.h"
#include "sim-hw.h"
#include "dis-asm.h"
#include "environ.h"
/* Used with get_progbounds to find out how much memory is needed for the
program. We don't want to allocate more, since that could mask
invalid memory accesses program bugs. */
struct progbounds {
USI startmem;
USI endmem;
USI end_loadmem;
USI start_nonloadmem;
};
static void free_state (SIM_DESC);
static void get_progbounds_iterator (bfd *, asection *, void *);
static SIM_RC cris_option_handler (SIM_DESC, sim_cpu *, int, char *, int);
/* Since we don't build the cgen-opcode table, we use the old
disassembler. */
static CGEN_DISASSEMBLER cris_disassemble_insn;
/* By default, we set up stack and environment variables like the Linux
kernel. */
static char cris_bare_iron = 0;
/* Whether 0x9000000xx have simulator-specific meanings. */
char cris_have_900000xxif = 0;
/* Used to optionally override the default start address of the
simulation. */
static USI cris_start_address = 0xffffffffu;
/* Used to optionally add offsets to the loaded image and its start
address. (Not used for the interpreter of dynamically loaded
programs or the DSO:s.) */
static int cris_program_offset = 0;
/* What to do when we face a more or less unknown syscall. */
enum cris_unknown_syscall_action_type cris_unknown_syscall_action
= CRIS_USYSC_MSG_STOP;
/* CRIS-specific options. */
typedef enum {
OPTION_CRIS_STATS = OPTION_START,
OPTION_CRIS_TRACE,
OPTION_CRIS_NAKED,
OPTION_CRIS_PROGRAM_OFFSET,
OPTION_CRIS_STARTADDR,
OPTION_CRIS_900000XXIF,
OPTION_CRIS_UNKNOWN_SYSCALL
} CRIS_OPTIONS;
static const OPTION cris_options[] =
{
{ {"cris-cycles", required_argument, NULL, OPTION_CRIS_STATS},
'\0', "basic|unaligned|schedulable|all",
"Dump execution statistics",
cris_option_handler, NULL },
{ {"cris-trace", required_argument, NULL, OPTION_CRIS_TRACE},
'\0', "basic",
"Emit trace information while running",
cris_option_handler, NULL },
{ {"cris-naked", no_argument, NULL, OPTION_CRIS_NAKED},
'\0', NULL, "Don't set up stack and environment",
cris_option_handler, NULL },
#if WITH_HW
{ {"cris-900000xx", no_argument, NULL, OPTION_CRIS_900000XXIF},
'\0', NULL, "Define addresses at 0x900000xx with simulator semantics",
cris_option_handler, NULL },
#endif
{ {"cris-unknown-syscall", required_argument, NULL,
OPTION_CRIS_UNKNOWN_SYSCALL},
'\0', "stop|enosys|enosys-quiet", "Action at an unknown system call",
cris_option_handler, NULL },
{ {"cris-program-offset", required_argument, NULL,
OPTION_CRIS_PROGRAM_OFFSET},
'\0', "OFFSET",
"Offset image addresses and default start address of a program",
cris_option_handler },
{ {"cris-start-address", required_argument, NULL, OPTION_CRIS_STARTADDR},
'\0', "ADDRESS", "Set start address",
cris_option_handler },
{ {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL, NULL }
};
/* Handle CRIS-specific options. */
static SIM_RC
cris_option_handler (SIM_DESC sd, sim_cpu *cpu ATTRIBUTE_UNUSED, int opt,
char *arg, int is_command ATTRIBUTE_UNUSED)
{
/* The options are CRIS-specific, but cpu-specific option-handling is
broken; required to being with "--cpu0-". We store the flags in an
unused field in the global state structure and move the flags over
to the module-specific CPU data when we store things in the
cpu-specific structure. */
char *tracefp = STATE_TRACE_FLAGS (sd);
char *chp = arg;
switch ((CRIS_OPTIONS) opt)
{
case OPTION_CRIS_STATS:
if (strcmp (arg, "basic") == 0)
*tracefp = FLAG_CRIS_MISC_PROFILE_SIMPLE;
else if (strcmp (arg, "unaligned") == 0)
*tracefp
= (FLAG_CRIS_MISC_PROFILE_UNALIGNED
| FLAG_CRIS_MISC_PROFILE_SIMPLE);
else if (strcmp (arg, "schedulable") == 0)
*tracefp
= (FLAG_CRIS_MISC_PROFILE_SCHEDULABLE
| FLAG_CRIS_MISC_PROFILE_SIMPLE);
else if (strcmp (arg, "all") == 0)
*tracefp = FLAG_CRIS_MISC_PROFILE_ALL;
else
{
/* Beware; the framework does not handle the error case;
we have to do it ourselves. */
sim_io_eprintf (sd, "Unknown option `--cris-cycles=%s'\n", arg);
return SIM_RC_FAIL;
}
break;
case OPTION_CRIS_TRACE:
if (strcmp (arg, "basic") == 0)
*tracefp |= FLAG_CRIS_MISC_PROFILE_XSIM_TRACE;
else
{
sim_io_eprintf (sd, "Unknown option `--cris-trace=%s'\n", arg);
return SIM_RC_FAIL;
}
break;
case OPTION_CRIS_NAKED:
cris_bare_iron = 1;
break;
case OPTION_CRIS_900000XXIF:
cris_have_900000xxif = 1;
break;
case OPTION_CRIS_STARTADDR:
errno = 0;
cris_start_address = (USI) strtoul (chp, &chp, 0);
if (errno != 0 || *chp != 0)
{
sim_io_eprintf (sd, "Invalid option `--cris-start-address=%s'\n",
arg);
return SIM_RC_FAIL;
}
break;
case OPTION_CRIS_PROGRAM_OFFSET:
errno = 0;
cris_program_offset = (int) strtol (chp, &chp, 0);
if (errno != 0 || *chp != 0)
{
sim_io_eprintf (sd, "Invalid option `--cris-program-offset=%s'\n",
arg);
return SIM_RC_FAIL;
}
break;
case OPTION_CRIS_UNKNOWN_SYSCALL:
if (strcmp (arg, "enosys") == 0)
cris_unknown_syscall_action = CRIS_USYSC_MSG_ENOSYS;
else if (strcmp (arg, "enosys-quiet") == 0)
cris_unknown_syscall_action = CRIS_USYSC_QUIET_ENOSYS;
else if (strcmp (arg, "stop") == 0)
cris_unknown_syscall_action = CRIS_USYSC_MSG_STOP;
else
{
sim_io_eprintf (sd, "Unknown option `--cris-unknown-syscall=%s'\n",
arg);
return SIM_RC_FAIL;
}
break;
default:
/* We'll actually never get here; the caller handles the error
case. */
sim_io_eprintf (sd, "Unknown option `%s'\n", arg);
return SIM_RC_FAIL;
}
/* Imply --profile-model=on. */
return sim_profile_set_option (sd, "-model", PROFILE_MODEL_IDX, "on");
}
/* An ELF-specific simplified ../common/sim-load.c:sim_load_file,
using the program headers, not sections, in order to make sure that
the program headers themeselves are also loaded. The caller is
responsible for asserting that ABFD is an ELF file. */
static bfd_boolean
cris_load_elf_file (SIM_DESC sd, struct bfd *abfd, sim_write_fn do_write)
{
Elf_Internal_Phdr *phdr;
int n_hdrs;
int i;
bfd_boolean verbose = STATE_OPEN_KIND (sd) == SIM_OPEN_DEBUG;
phdr = elf_tdata (abfd)->phdr;
n_hdrs = elf_elfheader (abfd)->e_phnum;
/* We're only interested in PT_LOAD; all necessary information
should be covered by that. */
for (i = 0; i < n_hdrs; i++)
{
bfd_byte *buf;
bfd_vma lma = STATE_LOAD_AT_LMA_P (sd)
? phdr[i].p_paddr : phdr[i].p_vaddr;
if (phdr[i].p_type != PT_LOAD)
continue;
buf = xmalloc (phdr[i].p_filesz);
if (verbose)
sim_io_printf (sd,
"Loading segment at 0x%" PRIx64 ", "
"size 0x%" PRIx64 "\n",
(uint64_t) lma, (uint64_t) phdr[i].p_filesz);
if (bfd_seek (abfd, phdr[i].p_offset, SEEK_SET) != 0
|| (bfd_read (buf, phdr[i].p_filesz, abfd) != phdr[i].p_filesz))
{
sim_io_eprintf (sd,
"%s: could not read segment at 0x%" PRIx64 ", "
"size 0x%" PRIx64 "\n",
STATE_MY_NAME (sd), (uint64_t) lma,
(uint64_t) phdr[i].p_filesz);
free (buf);
return FALSE;
}
if (do_write (sd, lma, buf, phdr[i].p_filesz) != phdr[i].p_filesz)
{
sim_io_eprintf (sd,
"%s: could not load segment at 0x%" PRIx64 ", "
"size 0x%" PRIx64 "\n",
STATE_MY_NAME (sd), (uint64_t) lma,
(uint64_t) phdr[i].p_filesz);
free (buf);
return FALSE;
}
free (buf);
}
return TRUE;
}
/* Cover function of sim_state_free to free the cpu buffers as well. */
static void
free_state (SIM_DESC sd)
{
if (STATE_MODULES (sd) != NULL)
sim_module_uninstall (sd);
sim_cpu_free_all (sd);
sim_state_free (sd);
}
/* Helper struct for cris_set_section_offset_iterator. */
struct offsetinfo
{
SIM_DESC sd;
int offset;
};
/* BFD section iterator to offset the LMA and VMA. */
static void
cris_set_section_offset_iterator (bfd *abfd, asection *s, void *vp)
{
struct offsetinfo *p = (struct offsetinfo *) vp;
SIM_DESC sd = p->sd;
int offset = p->offset;
if ((bfd_section_flags (s) & SEC_ALLOC))
{
bfd_vma vma = bfd_section_vma (s);
bfd_set_section_vma (s, vma + offset);
}
/* This seems clumsy and inaccurate, but let's stick to doing it the
same way as sim_analyze_program for consistency. */
if (strcmp (bfd_section_name (s), ".text") == 0)
STATE_TEXT_START (sd) = bfd_section_vma (s);
}
/* Adjust the start-address, LMA and VMA of a SD. Must be called
after sim_analyze_program. */
static void
cris_offset_sections (SIM_DESC sd, int offset)
{
struct bfd *abfd = STATE_PROG_BFD (sd);
asection *text;
struct offsetinfo oi;
/* Only happens for usage error. */
if (abfd == NULL)
return;
oi.sd = sd;
oi.offset = offset;
bfd_map_over_sections (abfd, cris_set_section_offset_iterator, &oi);
bfd_set_start_address (abfd, bfd_get_start_address (abfd) + offset);
STATE_START_ADDR (sd) = bfd_get_start_address (abfd);
}
/* BFD section iterator to find the highest and lowest allocated and
non-allocated section addresses (plus one). */
static void
get_progbounds_iterator (bfd *abfd ATTRIBUTE_UNUSED, asection *s, void *vp)
{
struct progbounds *pbp = (struct progbounds *) vp;
if ((bfd_section_flags (s) & SEC_ALLOC))
{
bfd_size_type sec_size = bfd_section_size (s);
bfd_size_type sec_start = bfd_section_vma (s);
bfd_size_type sec_end = sec_start + sec_size;
if (sec_end > pbp->endmem)
pbp->endmem = sec_end;
if (sec_start < pbp->startmem)
pbp->startmem = sec_start;
if ((bfd_section_flags (s) & SEC_LOAD))
{
if (sec_end > pbp->end_loadmem)
pbp->end_loadmem = sec_end;
}
else if (sec_start < pbp->start_nonloadmem)
pbp->start_nonloadmem = sec_start;
}
}
/* Get the program boundaries. Because not everything is covered by
sections in ELF, notably the program headers, we use the program
headers instead. */
static void
cris_get_progbounds (struct bfd *abfd, struct progbounds *pbp)
{
Elf_Internal_Phdr *phdr;
int n_hdrs;
int i;
pbp->startmem = 0xffffffff;
pbp->endmem = 0;
pbp->end_loadmem = 0;
pbp->start_nonloadmem = 0xffffffff;
/* In case we're ever used for something other than ELF, use the
generic method. */
if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
{
bfd_map_over_sections (abfd, get_progbounds_iterator, pbp);
return;
}
phdr = elf_tdata (abfd)->phdr;
n_hdrs = elf_elfheader (abfd)->e_phnum;
/* We're only interested in PT_LOAD; all necessary information
should be covered by that. */
for (i = 0; i < n_hdrs; i++)
{
if (phdr[i].p_type != PT_LOAD)
continue;
if (phdr[i].p_paddr < pbp->startmem)
pbp->startmem = phdr[i].p_paddr;
if (phdr[i].p_paddr + phdr[i].p_memsz > pbp->endmem)
pbp->endmem = phdr[i].p_paddr + phdr[i].p_memsz;
if (phdr[i].p_paddr + phdr[i].p_filesz > pbp->end_loadmem)
pbp->end_loadmem = phdr[i].p_paddr + phdr[i].p_filesz;
if (phdr[i].p_memsz > phdr[i].p_filesz
&& phdr[i].p_paddr + phdr[i].p_filesz < pbp->start_nonloadmem)
pbp->start_nonloadmem = phdr[i].p_paddr + phdr[i].p_filesz;
}
}
/* Parameter communication by static variables, hmm... Oh well, for
simplicity. */
static bfd_vma exec_load_addr;
static bfd_vma interp_load_addr;
static bfd_vma interp_start_addr;
/* Supposed to mimic Linux' "NEW_AUX_ENT (AT_PHDR, load_addr + exec->e_phoff)". */
static USI
aux_ent_phdr (struct bfd *ebfd)
{
return elf_elfheader (ebfd)->e_phoff + exec_load_addr;
}
/* We just pass on the header info; we don't have our own idea of the
program header entry size. */
static USI
aux_ent_phent (struct bfd *ebfd)
{
return elf_elfheader (ebfd)->e_phentsize;
}
/* Like "NEW_AUX_ENT(AT_PHNUM, exec->e_phnum)". */
static USI
aux_ent_phnum (struct bfd *ebfd)
{
return elf_elfheader (ebfd)->e_phnum;
}
/* Like "NEW_AUX_ENT(AT_BASE, interp_load_addr)". */
static USI
aux_ent_base (struct bfd *ebfd)
{
return interp_load_addr;
}
/* Like "NEW_AUX_ENT(AT_ENTRY, exec->e_entry)". */
static USI
aux_ent_entry (struct bfd *ebfd)
{
ASSERT (elf_elfheader (ebfd)->e_entry == bfd_get_start_address (ebfd));
return elf_elfheader (ebfd)->e_entry;
}
/* Helper for cris_handle_interpreter: like sim_write, but load at
interp_load_addr offset. */
static uint64_t
cris_write_interp (SIM_DESC sd, uint64_t mem, const void *buf, uint64_t length)
{
return sim_write (sd, mem + interp_load_addr, buf, length);
}
/* Cater to the presence of an interpreter: load it and set
interp_start_addr. Return FALSE if there was an error, TRUE if
everything went fine, including an interpreter being absent and
the program being in a non-ELF format. */
static bfd_boolean
cris_handle_interpreter (SIM_DESC sd, struct bfd *abfd)
{
int i, n_hdrs;
bfd_byte buf[4];
char *interp = NULL;
struct bfd *ibfd;
bfd_boolean ok = FALSE;
Elf_Internal_Phdr *phdr;
if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
return TRUE;
phdr = elf_tdata (abfd)->phdr;
n_hdrs = aux_ent_phnum (abfd);
/* Check the program headers for presence of an interpreter. */
for (i = 0; i < n_hdrs; i++)
{
int interplen;
bfd_size_type interpsiz;
struct progbounds interp_bounds;
if (phdr[i].p_type != PT_INTERP)
continue;
/* Get the name of the interpreter, prepended with the sysroot
(empty if absent). */
interplen = phdr[i].p_filesz;
interp = xmalloc (interplen + strlen (simulator_sysroot));
strcpy (interp, simulator_sysroot);
/* Read in the name. */
if (bfd_seek (abfd, phdr[i].p_offset, SEEK_SET) != 0
|| (bfd_read (interp + strlen (simulator_sysroot), interplen, abfd)
!= interplen))
goto interpname_failed;
/* Like Linux, require the string to be 0-terminated. */
if (interp[interplen + strlen (simulator_sysroot) - 1] != 0)
goto interpname_failed;
/* Inspect the interpreter. */
ibfd = bfd_openr (interp, STATE_TARGET (sd));
if (ibfd == NULL)
goto interpname_failed;
/* The interpreter is at least something readable to BFD; make
sure it's an ELF non-archive file. */
if (!bfd_check_format (ibfd, bfd_object)
|| bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
goto interp_failed;
/* Check the layout of the interpreter. */
cris_get_progbounds (ibfd, &interp_bounds);
/* Round down to pagesize the start page and up the endpage.
Don't round the *load and *nonload members. */
interp_bounds.startmem &= ~8191;
interp_bounds.endmem = (interp_bounds.endmem + 8191) & ~8191;
/* Until we need a more dynamic solution, assume we can put the
interpreter at this fixed location. NB: this is not what
happens for Linux 2008-12-28, but it could and might and
perhaps should. */
interp_load_addr = 0x40000;
interpsiz = interp_bounds.endmem - interp_bounds.startmem;
/* interp_filesiz = interp_bounds.end_loadmem - interp_bounds.startmem; */
/* If we have a non-DSO or interpreter starting at the wrong
address, bail. */
if (interp_bounds.startmem != 0
|| interpsiz + interp_load_addr >= exec_load_addr)
goto interp_failed;
/* We don't have the API to get the address of a simulator
memory area, so we go via a temporary area. Luckily, the
interpreter is supposed to be small, less than 0x40000
bytes. */
sim_do_commandf (sd, "memory region 0x%" PRIx64 ",0x%" PRIx64,
(uint64_t) interp_load_addr, (uint64_t) interpsiz);
/* Now that memory for the interpreter is defined, load it. */
if (!cris_load_elf_file (sd, ibfd, cris_write_interp))
goto interp_failed;
/* It's no use setting STATE_START_ADDR, because it gets
overwritten by a sim_analyze_program call in sim_load. Let's
just store it locally. */
interp_start_addr
= (bfd_get_start_address (ibfd)
- interp_bounds.startmem + interp_load_addr);
/* Linux cares only about the first PT_INTERP, so let's ignore
the rest. */
goto all_done;
}
/* Register R10 should hold 0 at static start (no finifunc), but
that's the default, so don't bother. */
return TRUE;
all_done:
ok = TRUE;
interp_failed:
bfd_close (ibfd);
interpname_failed:
if (!ok)
sim_io_eprintf (sd,
"%s: could not load ELF interpreter `%s' for program `%s'\n",
STATE_MY_NAME (sd),
interp == NULL ? "(what's-its-name)" : interp,
bfd_get_filename (abfd));
free (interp);
return ok;
}
extern const SIM_MACH * const cris_sim_machs[];
/* Create an instance of the simulator. */
SIM_DESC
sim_open (SIM_OPEN_KIND kind, host_callback *callback, struct bfd *abfd,
char * const *argv)
{
char c;
int i;
USI startmem = 0;
USI endmem = CRIS_DEFAULT_MEM_SIZE;
USI endbrk = endmem;
USI stack_low = 0;
SIM_DESC sd = sim_state_alloc (kind, callback);
static const struct auxv_entries_s
{
bfd_byte id;
USI (*efn) (struct bfd *ebfd);
USI val;
} auxv_entries[] =
{
#define AUX_ENT(a, b) {a, NULL, b}
#define AUX_ENTF(a, f) {a, f, 0}
AUX_ENT (AT_HWCAP, 0),
AUX_ENT (AT_PAGESZ, 8192),
AUX_ENT (AT_CLKTCK, 100),
AUX_ENTF (AT_PHDR, aux_ent_phdr),
AUX_ENTF (AT_PHENT, aux_ent_phent),
AUX_ENTF (AT_PHNUM, aux_ent_phnum),
AUX_ENTF (AT_BASE, aux_ent_base),
AUX_ENT (AT_FLAGS, 0),
AUX_ENTF (AT_ENTRY, aux_ent_entry),
/* Or is root better? Maybe have it settable? */
AUX_ENT (AT_UID, 500),
AUX_ENT (AT_EUID, 500),
AUX_ENT (AT_GID, 500),
AUX_ENT (AT_EGID, 500),
AUX_ENT (AT_SECURE, 0),
AUX_ENT (AT_NULL, 0)
};
/* Can't initialize to "" below. It's either a GCC bug in old
releases (up to and including 2.95.3 (.4 in debian) or a bug in the
standard ;-) that the rest of the elements won't be initialized. */
bfd_byte sp_init[4] = {0, 0, 0, 0};
/* Set default options before parsing user options. */
STATE_MACHS (sd) = cris_sim_machs;
STATE_MODEL_NAME (sd) = "crisv32";
current_target_byte_order = BFD_ENDIAN_LITTLE;
/* The cpu data is kept in a separately allocated chunk of memory. */
if (sim_cpu_alloc_all_extra (sd, 0, sizeof (struct cris_sim_cpu))
!= SIM_RC_OK)
{
free_state (sd);
return 0;
}
if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
{
free_state (sd);
return 0;
}
/* Add the CRIS-specific option list to the simulator. */
if (sim_add_option_table (sd, NULL, cris_options) != SIM_RC_OK)
{
free_state (sd);
return 0;
}
/* The parser will print an error message for us, so we silently return. */
if (sim_parse_args (sd, argv) != SIM_RC_OK)
{
free_state (sd);
return 0;
}
/* check for/establish the reference program image */
if (sim_analyze_program (sd, STATE_PROG_FILE (sd), abfd) != SIM_RC_OK)
{
/* When there's an error, sim_analyze_program has already output
a message. Let's just clarify it, as "not an object file"
perhaps doesn't ring a bell. */
sim_io_eprintf (sd, "(not a CRIS program)\n");
free_state (sd);
return 0;
}
/* We might get called with the caller expecting us to get hold of
the bfd for ourselves, which would happen at the
sim_analyze_program call above. */
if (abfd == NULL)
abfd = STATE_PROG_BFD (sd);
/* Adjust the addresses of the program at this point. Unfortunately
this does not affect ELF program headers, so we have to handle
that separately. */
cris_offset_sections (sd, cris_program_offset);
if (abfd != NULL && bfd_get_arch (abfd) == bfd_arch_unknown)
{
if (STATE_PROG_FILE (sd) != NULL)
sim_io_eprintf (sd, "%s: `%s' is not a CRIS program\n",
STATE_MY_NAME (sd), STATE_PROG_FILE (sd));
else
sim_io_eprintf (sd, "%s: program to be run is not a CRIS program\n",
STATE_MY_NAME (sd));
free_state (sd);
return 0;
}
/* For CRIS simulator-specific use, we need to find out the bounds of
the program as well, which is not done by sim_analyze_program
above. */
if (abfd != NULL)
{
struct progbounds pb;
/* The sections should now be accessible using bfd functions. */
cris_get_progbounds (abfd, &pb);
/* We align the area that the program uses to page boundaries. */
startmem = pb.startmem & ~8191;
endbrk = pb.endmem;
endmem = (endbrk + 8191) & ~8191;
}
/* Find out how much room is needed for the environment and argv, create
that memory and fill it. Only do this when there's a program
specified.
TODO: Move this to sim_create_inferior and use STATE_PROG_ENVP. */
if (abfd != NULL && !cris_bare_iron)
{
const char *name = bfd_get_filename (abfd);
/* We use these maps to give the same behavior as the old xsim
simulator. */
USI envtop = 0x40000000;
USI stacktop = 0x3e000000;
USI envstart;
int envc;
int len = strlen (name) + 1;
USI epp, epp0;
USI stacklen;
int i;
char **prog_argv = STATE_PROG_ARGV (sd);
int my_argc = 0;
USI csp;
bfd_byte buf[4];
/* Count in the environment as well. */
for (envc = 0; environ[envc] != NULL; envc++)
len += strlen (environ[envc]) + 1;
for (i = 0; prog_argv[i] != NULL; my_argc++, i++)
len += strlen (prog_argv[i]) + 1;
envstart = (envtop - len) & ~8191;
/* Create read-only block for the environment strings. */
sim_core_attach (sd, NULL, 0, access_read, 0,
envstart, (len + 8191) & ~8191,
0, NULL, NULL);
/* This shouldn't happen. */
if (envstart < stacktop)
stacktop = envstart - 64 * 8192;
csp = stacktop;
/* Note that the linux kernel does not correctly compute the storage
needs for the static-exe AUX vector. */
csp -= ARRAY_SIZE (auxv_entries) * 4 * 2;
csp -= (envc + 1) * 4;
csp -= (my_argc + 1) * 4;
csp -= 4;
/* Write the target representation of the start-up-value for the
stack-pointer suitable for register initialization below. */
bfd_putl32 (csp, sp_init);
/* If we make this 1M higher; say 8192*1024, we have to take
special precautions for pthreads, because pthreads assumes that
the memory that low isn't mmapped, and that it can mmap it
without fallback in case of failure (and we fail ungracefully
long before *that*: the memory isn't accounted for in our mmap
list). */
stack_low = (csp - (7168*1024)) & ~8191;
stacklen = stacktop - stack_low;
/* Tee hee, we have an executable stack. Well, it's necessary to
test GCC trampolines... */
sim_core_attach (sd, NULL, 0, access_read_write_exec, 0,
stack_low, stacklen,
0, NULL, NULL);
epp = epp0 = envstart;
/* Can't use sim_core_write_unaligned_4 without everything
initialized when tracing, and then these writes would get into
the trace. */
#define write_dword(addr, data) \
do \
{ \
USI data_ = data; \
USI addr_ = addr; \
bfd_putl32 (data_, buf); \
if (sim_core_write_buffer (sd, NULL, NULL_CIA, buf, addr_, 4) != 4)\
goto abandon_chip; \
} \
while (0)
write_dword (csp, my_argc);
csp += 4;
for (i = 0; i < my_argc; i++, csp += 4)
{
size_t strln = strlen (prog_argv[i]) + 1;
if (sim_core_write_buffer (sd, NULL, NULL_CIA, prog_argv[i], epp,
strln)
!= strln)
goto abandon_chip;
write_dword (csp, envstart + epp - epp0);
epp += strln;
}
write_dword (csp, 0);
csp += 4;
for (i = 0; i < envc; i++, csp += 4)
{
unsigned int strln = strlen (environ[i]) + 1;
if (sim_core_write_buffer (sd, NULL, NULL_CIA, environ[i], epp, strln)
!= strln)
goto abandon_chip;
write_dword (csp, envstart + epp - epp0);
epp += strln;
}
write_dword (csp, 0);
csp += 4;
/* The load address of the executable could presumably be
different than the lowest used memory address, but let's
stick to simplicity until needed. And
cris_handle_interpreter might change startmem and endmem, so
let's set it now. */
exec_load_addr = startmem;
if (!cris_handle_interpreter (sd, abfd))
goto abandon_chip;
if (bfd_get_flavour (abfd) == bfd_target_elf_flavour)
for (i = 0; i < ARRAY_SIZE (auxv_entries); i++)
{
write_dword (csp, auxv_entries[i].id);
write_dword (csp + 4,
auxv_entries[i].efn != NULL
? (*auxv_entries[i].efn) (abfd)
: auxv_entries[i].val);
csp += 4 + 4;
}
}
/* Allocate core managed memory if none specified by user. */
if (sim_core_read_buffer (sd, NULL, read_map, &c, startmem, 1) == 0)
sim_do_commandf (sd, "memory region 0x%" PRIx32 ",0x%" PRIx32,
startmem, endmem - startmem);
/* Allocate simulator I/O managed memory if none specified by user. */
#if WITH_HW
if (cris_have_900000xxif)
sim_hw_parse (sd, "/core/%s/reg %#x %i", "cris_900000xx", 0x90000000, 0x100);
#else
/* With the option disabled, nothing should be able to set this variable.
We should "use" it, though, and why not assert that it isn't set. */
ASSERT (! cris_have_900000xxif);
#endif
/* Establish any remaining configuration options. */
if (sim_config (sd) != SIM_RC_OK)
{
abandon_chip:
free_state (sd);
return 0;
}
if (sim_post_argv_init (sd) != SIM_RC_OK)
{
free_state (sd);
return 0;
}
/* Open a copy of the cpu descriptor table. */
{
CGEN_CPU_DESC cd = cris_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name,
CGEN_ENDIAN_LITTLE);
for (i = 0; i < MAX_NR_PROCESSORS; ++i)
{
SIM_CPU *cpu = STATE_CPU (sd, i);
struct cris_sim_cpu *cris_cpu = CRIS_SIM_CPU (cpu);
CPU_CPU_DESC (cpu) = cd;
CPU_DISASSEMBLER (cpu) = cris_disassemble_insn;
/* See cris_option_handler for the reason why this is needed. */
CPU_CRIS_MISC_PROFILE (cpu)->flags = STATE_TRACE_FLAGS (sd)[0];
/* Set SP to the stack we allocated above. */
(* CPU_REG_STORE (cpu)) (cpu, H_GR_SP, (const unsigned char *) sp_init, 4);
/* Set the simulator environment data. */
cris_cpu->highest_mmapped_page = NULL;
cris_cpu->endmem = endmem;
cris_cpu->endbrk = endbrk;
cris_cpu->stack_low = stack_low;
cris_cpu->syscalls = 0;
cris_cpu->m1threads = 0;
cris_cpu->threadno = 0;
cris_cpu->max_threadid = 0;
cris_cpu->thread_data = NULL;
memset (cris_cpu->sighandler, 0, sizeof (cris_cpu->sighandler));
cris_cpu->make_thread_cpu_data = NULL;
cris_cpu->thread_cpu_data_size = 0;
#if WITH_HW
cris_cpu->deliver_interrupt = NULL;
#endif
}
#if WITH_HW
/* Always be cycle-accurate and call before/after functions if
with-hardware. */
sim_profile_set_option (sd, "-model", PROFILE_MODEL_IDX, "on");
#endif
}
cris_set_callbacks (callback);
return sd;
}
SIM_RC
sim_create_inferior (SIM_DESC sd, struct bfd *abfd,
char * const *argv,
char * const *env)
{
SIM_CPU *current_cpu = STATE_CPU (sd, 0);
host_callback *cb = STATE_CALLBACK (sd);
bfd_vma addr;
if (sd != NULL)
addr = cris_start_address != (USI) -1
? cris_start_address
: (interp_start_addr != 0
? interp_start_addr
: bfd_get_start_address (abfd));
else
addr = 0;
sim_pc_set (current_cpu, addr);
/* Standalone mode (i.e. `run`) will take care of the argv for us in
sim_open() -> sim_parse_args(). But in debug mode (i.e. 'target sim'
with `gdb`), we need to handle it because the user can change the
argv on the fly via gdb's 'run'. */
if (STATE_PROG_ARGV (sd) != argv)
{
freeargv (STATE_PROG_ARGV (sd));
STATE_PROG_ARGV (sd) = dupargv (argv);
}
if (STATE_PROG_ENVP (sd) != env)
{
freeargv (STATE_PROG_ENVP (sd));
STATE_PROG_ENVP (sd) = dupargv (env);
}
cb->argv = STATE_PROG_ARGV (sd);
cb->envp = STATE_PROG_ENVP (sd);
return SIM_RC_OK;
}
/* Disassemble an instruction. */
static void
cris_disassemble_insn (SIM_CPU *cpu,
const CGEN_INSN *insn ATTRIBUTE_UNUSED,
const ARGBUF *abuf ATTRIBUTE_UNUSED,
IADDR pc, char *buf)
{
disassembler_ftype pinsn;
struct disassemble_info disasm_info;
SFILE sfile;
SIM_DESC sd = CPU_STATE (cpu);
sfile.buffer = sfile.current = buf;
INIT_DISASSEMBLE_INFO (disasm_info, (FILE *) &sfile,
(fprintf_ftype) sim_disasm_sprintf,
(fprintf_styled_ftype) sim_disasm_styled_sprintf);
disasm_info.endian = BFD_ENDIAN_LITTLE;
disasm_info.read_memory_func = sim_disasm_read_memory;
disasm_info.memory_error_func = sim_disasm_perror_memory;
disasm_info.application_data = cpu;
pinsn = cris_get_disassembler (STATE_PROG_BFD (sd));
(*pinsn) (pc, &disasm_info);
}
|