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
|
/*--------------------------------------------------------------------*/
/*--- Trampoline code page stuff. m_trampoline.S ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2000-2009 Julian Seward
jseward@acm.org
Copyright (C) 2006-2009 OpenWorks LLP
info@open-works.co.uk
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 2 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., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
#include "pub_core_basics_asm.h"
/* We need pub_core_vkiscnums.h, but the AIX5 formulation
brings in a load of C declarations. Defining this macro
makes them invisible. Yes, a nasty hack. */
#define VG_IN_ASSEMBLY_SOURCE
# include "pub_core_vkiscnums.h"
#undef VG_IN_ASSEMBLY_SOURCE
/* ------------------ SIMULATED CPU HELPERS ------------------ */
/*
Replacements for some functions to do with vsyscalls and signals.
This code runs on the simulated CPU.
*/
/*---------------------- x86-linux ----------------------*/
#if defined(VGP_x86_linux)
# define UD2_16 ud2 ; ud2 ; ud2 ; ud2 ;ud2 ; ud2 ; ud2 ; ud2
# define UD2_64 UD2_16 ; UD2_16 ; UD2_16 ; UD2_16
# define UD2_256 UD2_64 ; UD2_64 ; UD2_64 ; UD2_64
# define UD2_1024 UD2_256 ; UD2_256 ; UD2_256 ; UD2_256
# define UD2_PAGE UD2_1024 ; UD2_1024 ; UD2_1024 ; UD2_1024
/* a leading page of unexecutable code */
UD2_PAGE
.global VG_(trampoline_stuff_start)
VG_(trampoline_stuff_start):
.global VG_(x86_linux_SUBST_FOR_sigreturn)
VG_(x86_linux_SUBST_FOR_sigreturn):
/* This is a very specific sequence which GDB uses to
recognize signal handler frames. Also gcc: see
x86_fallback_frame_state() in
gcc-4.1.0/gcc/config/i386/linux-unwind.h */
popl %eax
movl $ __NR_sigreturn, %eax
int $0x80
ud2
.global VG_(x86_linux_SUBST_FOR_rt_sigreturn)
VG_(x86_linux_SUBST_FOR_rt_sigreturn):
/* Likewise for rt signal frames */
movl $ __NR_rt_sigreturn, %eax
int $0x80
ud2
/* There's no particular reason that this needs to be handwritten
assembly, but since that's what this file contains, here's a
simple index implementation (written in C and compiled by gcc.)
unsigned char* REDIR_FOR_index ( const char* s, int c )
{
unsigned char ch = (unsigned char)((unsigned int)c);
unsigned char* p = (unsigned char*)s;
while (1) {
if (*p == ch) return p;
if (*p == 0) return 0;
p++;
}
}
*/
.global VG_(x86_linux_REDIR_FOR_index)
.type VG_(x86_linux_REDIR_FOR_index), @function
VG_(x86_linux_REDIR_FOR_index):
pushl %ebp
movl %esp, %ebp
movl 8(%ebp), %eax
movzbl 12(%ebp), %ecx
movzbl (%eax), %edx
cmpb %dl, %cl
jne .L9
jmp .L2
.L11:
addl $1, %eax
movzbl (%eax), %edx
cmpb %dl, %cl
je .L2
.L9:
testb %dl, %dl
jne .L11
xorl %eax, %eax
.L2:
popl %ebp
ret
.size VG_(x86_linux_REDIR_FOR_index), .-VG_(x86_linux_REDIR_FOR_index)
.global VG_(trampoline_stuff_end)
VG_(trampoline_stuff_end):
/* and a trailing page of unexecutable code */
UD2_PAGE
# undef UD2_16
# undef UD2_64
# undef UD2_256
# undef UD2_1024
# undef UD2_PAGE
/*---------------------- amd64-linux ----------------------*/
#else
#if defined(VGP_amd64_linux)
# define UD2_16 ud2 ; ud2 ; ud2 ; ud2 ;ud2 ; ud2 ; ud2 ; ud2
# define UD2_64 UD2_16 ; UD2_16 ; UD2_16 ; UD2_16
# define UD2_256 UD2_64 ; UD2_64 ; UD2_64 ; UD2_64
# define UD2_1024 UD2_256 ; UD2_256 ; UD2_256 ; UD2_256
# define UD2_PAGE UD2_1024 ; UD2_1024 ; UD2_1024 ; UD2_1024
/* a leading page of unexecutable code */
UD2_PAGE
.global VG_(trampoline_stuff_start)
VG_(trampoline_stuff_start):
.global VG_(amd64_linux_SUBST_FOR_rt_sigreturn)
VG_(amd64_linux_SUBST_FOR_rt_sigreturn):
/* This is a very specific sequence which GDB uses to
recognize signal handler frames. */
movq $__NR_rt_sigreturn, %rax
syscall
ud2
.global VG_(amd64_linux_REDIR_FOR_vgettimeofday)
.type VG_(amd64_linux_REDIR_FOR_vgettimeofday), @function
VG_(amd64_linux_REDIR_FOR_vgettimeofday):
.LfnB2:
movq $__NR_gettimeofday, %rax
syscall
ret
.LfnE2:
.size VG_(amd64_linux_REDIR_FOR_vgettimeofday), .-.LfnB2
.global VG_(amd64_linux_REDIR_FOR_vtime)
.type VG_(amd64_linux_REDIR_FOR_vtime), @function
VG_(amd64_linux_REDIR_FOR_vtime):
.LfnB3:
movq $__NR_time, %rax
syscall
ret
.LfnE3:
.size VG_(amd64_linux_REDIR_FOR_vtime), .-.LfnB3
/* A CIE for the above two functions, followed by their FDEs */
.section .eh_frame,"a",@progbits
.Lframe1:
.long .LEcie1-.LScie1
.LScie1:
.long 0x0
.byte 0x1
.string "zR"
.uleb128 0x1
.sleb128 -8
.byte 0x10
.uleb128 0x1
.byte 0x3
.byte 0xc
.uleb128 0x7
.uleb128 0x8
.byte 0x90
.uleb128 0x1
.align 8
.LEcie1:
.LSfde2:
.long .LEfde2-.LASfde2
.LASfde2:
.long .LASfde2-.Lframe1
.long .LfnB2
.long .LfnE2-.LfnB2
.uleb128 0x0
.align 8
.LEfde2:
.LSfde3:
.long .LEfde3-.LASfde3
.LASfde3:
.long .LASfde3-.Lframe1
.long .LfnB3
.long .LfnE3-.LfnB3
.uleb128 0x0
.align 8
.LEfde3:
.previous
.global VG_(trampoline_stuff_end)
VG_(trampoline_stuff_end):
/* and a trailing page of unexecutable code */
UD2_PAGE
# undef UD2_16
# undef UD2_64
# undef UD2_256
# undef UD2_1024
# undef UD2_PAGE
/*---------------- ppc32-linux ----------------*/
#else
#if defined(VGP_ppc32_linux)
# define UD2_16 trap ; trap ; trap; trap
# define UD2_64 UD2_16 ; UD2_16 ; UD2_16 ; UD2_16
# define UD2_256 UD2_64 ; UD2_64 ; UD2_64 ; UD2_64
# define UD2_1024 UD2_256 ; UD2_256 ; UD2_256 ; UD2_256
# define UD2_PAGE UD2_1024 ; UD2_1024 ; UD2_1024 ; UD2_1024
/* a leading page of unexecutable code */
UD2_PAGE
.global VG_(trampoline_stuff_start)
VG_(trampoline_stuff_start):
.global VG_(ppc32_linux_SUBST_FOR_sigreturn)
VG_(ppc32_linux_SUBST_FOR_sigreturn):
li 0,__NR_sigreturn
sc
.long 0 /*illegal insn*/
.global VG_(ppc32_linux_SUBST_FOR_rt_sigreturn)
VG_(ppc32_linux_SUBST_FOR_rt_sigreturn):
li 0,__NR_rt_sigreturn
sc
.long 0 /*illegal insn*/
/* There's no particular reason that this needs to be handwritten
assembly, but since that's what this file contains, here's a
simple strlen implementation (written in C and compiled by gcc.)
*/
.global VG_(ppc32_linux_REDIR_FOR_strlen)
.type VG_(ppc32_linux_REDIR_FOR_strlen), @function
VG_(ppc32_linux_REDIR_FOR_strlen):
lbz 4,0(3)
li 9,0
cmpwi 0,4,0
beq- 0,.L18
.L19:
lbzu 5,1(3)
addi 9,9,1
cmpwi 0,5,0
bne+ 0,.L19
.L18:
mr 3,9
blr
.size VG_(ppc32_linux_REDIR_FOR_strlen), .-VG_(ppc32_linux_REDIR_FOR_strlen)
/* Ditto strcmp */
.global VG_(ppc32_linux_REDIR_FOR_strcmp)
.type VG_(ppc32_linux_REDIR_FOR_strcmp), @function
VG_(ppc32_linux_REDIR_FOR_strcmp):
.L20:
lbz 0,0(3)
cmpwi 7,0,0
bne- 7,.L21
lbz 0,0(4)
li 11,0
cmpwi 7,0,0
beq- 7,.L22
.L21:
lbz 0,0(3)
li 11,-1
cmpwi 7,0,0
beq- 7,.L22
lbz 0,0(4)
li 11,1
cmpwi 7,0,0
beq- 7,.L22
lbz 9,0(3)
lbz 0,0(4)
li 11,-1
cmplw 7,9,0
blt- 7,.L22
lbz 9,0(3)
lbz 0,0(4)
li 11,1
addi 3,3,1
addi 4,4,1
cmplw 7,9,0
ble+ 7,.L20
.L22:
mr 3,11
blr
.size VG_(ppc32_linux_REDIR_FOR_strcmp), .-VG_(ppc32_linux_REDIR_FOR_strcmp)
/* Ditto index/strchr */
.global VG_(ppc32_linux_REDIR_FOR_strchr)
.type VG_(ppc32_linux_REDIR_FOR_strchr), @function
VG_(ppc32_linux_REDIR_FOR_strchr):
lbz 0,0(3)
rlwinm 4,4,0,0xff
cmpw 7,4,0
beqlr 7
cmpwi 7,0,0
bne 7,.L308
b .L304
.L309:
beq 6,.L304
.L308:
lbzu 0,1(3)
cmpw 7,4,0
cmpwi 6,0,0
bne 7,.L309
blr
.L304:
li 3,0
blr
.size VG_(ppc32_linux_REDIR_FOR_strchr),.-VG_(ppc32_linux_REDIR_FOR_strchr)
.global VG_(trampoline_stuff_end)
VG_(trampoline_stuff_end):
/* and a trailing page of unexecutable code */
UD2_PAGE
# undef UD2_16
# undef UD2_64
# undef UD2_256
# undef UD2_1024
# undef UD2_PAGE
/*---------------- ppc64-linux ----------------*/
#else
#if defined(VGP_ppc64_linux)
# define UD2_16 trap ; trap ; trap; trap
# define UD2_64 UD2_16 ; UD2_16 ; UD2_16 ; UD2_16
# define UD2_256 UD2_64 ; UD2_64 ; UD2_64 ; UD2_64
# define UD2_1024 UD2_256 ; UD2_256 ; UD2_256 ; UD2_256
# define UD2_PAGE UD2_1024 ; UD2_1024 ; UD2_1024 ; UD2_1024
/* a leading page of unexecutable code */
UD2_PAGE
.global VG_(trampoline_stuff_start)
VG_(trampoline_stuff_start):
.global VG_(ppc64_linux_SUBST_FOR_rt_sigreturn)
VG_(ppc64_linux_SUBST_FOR_rt_sigreturn):
li 0,__NR_rt_sigreturn
sc
.long 0 /*illegal insn*/
/* See comment in pub_core_trampoline.h for what this is for */
.global VG_(ppctoc_magic_redirect_return_stub)
VG_(ppctoc_magic_redirect_return_stub):
trap
/* this function is written using the "dotless" ABI convention */
.align 2
.globl VG_(ppc64_linux_REDIR_FOR_strlen)
.section ".opd","aw"
.align 3
VG_(ppc64_linux_REDIR_FOR_strlen):
.quad .L.VG_(ppc64_linux_REDIR_FOR_strlen),.TOC.@tocbase,0
.previous
.size VG_(ppc64_linux_REDIR_FOR_strlen), \
.L0end-.L.VG_(ppc64_linux_REDIR_FOR_strlen)
.type VG_(ppc64_linux_REDIR_FOR_strlen), @function
.L.VG_(ppc64_linux_REDIR_FOR_strlen):
mr 9,3
lbz 0,0(3)
li 3,0
cmpwi 7,0,0
beqlr 7
li 3,0
.L01:
addi 0,3,1
extsw 3,0
lbzx 0,9,3
cmpwi 7,0,0
bne 7,.L01
blr
.long 0
.byte 0,0,0,0,0,0,0,0
.L0end:
/* this function is written using the "dotless" ABI convention */
.align 2
.globl VG_(ppc64_linux_REDIR_FOR_strchr)
.section ".opd","aw"
.align 3
VG_(ppc64_linux_REDIR_FOR_strchr):
.quad .L.VG_(ppc64_linux_REDIR_FOR_strchr),.TOC.@tocbase,0
.previous
.size VG_(ppc64_linux_REDIR_FOR_strchr), \
.L1end-.L.VG_(ppc64_linux_REDIR_FOR_strchr)
.type VG_(ppc64_linux_REDIR_FOR_strchr),@function
.L.VG_(ppc64_linux_REDIR_FOR_strchr):
lbz 0,0(3)
rldicl 4,4,0,56
cmpw 7,4,0
beqlr 7
cmpdi 7,0,0
bne 7,.L18
b .L14
.L19:
beq 6,.L14
.L18:
lbzu 0,1(3)
cmpw 7,4,0
cmpdi 6,0,0
bne 7,.L19
blr
.L14:
li 3,0
blr
.long 0
.byte 0,0,0,0,0,0,0,0
.L1end:
.global VG_(trampoline_stuff_end)
VG_(trampoline_stuff_end):
/* and a trailing page of unexecutable code */
UD2_PAGE
# undef UD2_16
# undef UD2_64
# undef UD2_256
# undef UD2_1024
# undef UD2_PAGE
/*---------------- ppc32-aix5 ----------------*/
#else
#if defined(VGP_ppc32_aix5)
# define UD2_16 trap ; trap ; trap; trap
# define UD2_64 UD2_16 ; UD2_16 ; UD2_16 ; UD2_16
# define UD2_256 UD2_64 ; UD2_64 ; UD2_64 ; UD2_64
# define UD2_1024 UD2_256 ; UD2_256 ; UD2_256 ; UD2_256
# define UD2_PAGE UD2_1024 ; UD2_1024 ; UD2_1024 ; UD2_1024
.csect .text[PR]
/* a leading page of unexecutable code */
UD2_PAGE
.globl VG_(trampoline_stuff_start)
VG_(trampoline_stuff_start):
/* See pub_core_trampoline.h for an explaination of this. Also
see pub_core_initimg.h, struct AIX5PreloadPage. On entry, r3
points to an AIX5PreloadPage structure. Note we can only
use r2-r10 as scratch registers here since those are the
only ones restored from the preload page when finally
starting the client. */
.globl VG_(ppc32_aix5_do_preloads_then_start_client)
VG_(ppc32_aix5_do_preloads_then_start_client):
stwu 1,-1024(1)
stw 3,512(1) /* stash r3 512 bytes up stack */
/* Try to load .../vgpreload_core.so */
lwz 2,0(3) /* r2 = __NR___loadx */
lwz 5,20(3) /* r5 = off_preloadcorename */
add 6,3,5 /* r6 = preloadcorename */
addis 1,1,-4
bl do___loadx
addis 1,1,4
cmpwi 0,3,0
beq .Lfailed
/* Try to load .../vgpreload_tool.so, if it exists */
lwz 3,512(1) /* restore r3 */
lwz 2,0(3) /* r2 = __NR___loadx */
lwz 5,24(3) /* r5 = off_preloadtoolname */
cmpwi 0,5,0 /* skip tool preload if */
beq .Ltry_preload /* name not present */
add 6,3,5 /* r6 = preloadtoolname */
addis 1,1,-4
bl do___loadx
addis 1,1,4
cmpwi 0,3,0
beq .Lfailed
.Ltry_preload:
/* Try to load the LD_PRELOAD= file, if it exists */
lwz 3,512(1) /* restore r3 */
lwz 2,0(3) /* r2 = __NR___loadx */
lwz 5,28(3) /* r5 = off_ld_preloadname */
cmpwi 0,5,0 /* skip ld_preload if */
beq .Lstart_client /* name not present */
add 6,3,5 /* r6 = ld_preloadname */
addis 1,1,-4
bl do___loadx
addis 1,1,4
cmpwi 0,3,0
beq .Lfailed
.Lstart_client:
/* Success. Restore r2-r10 from preloadpage-> and start
the client. */
lwz 3,512(1) /* restore r3 */
addi 1,1,1024
lwz 2,32+4(3) /* preloadpage->client_start */
mtctr 2
lwz 2,40+4(3) /* preloadpage->r2 */
lwz 4,56+4(3) /* preloadpage->r4 */
lwz 5,64+4(3) /* preloadpage->r5 */
lwz 6,72+4(3) /* preloadpage->r6 */
lwz 7,80+4(3) /* preloadpage->r7 */
lwz 8,88+4(3) /* preloadpage->r8 */
lwz 9,96+4(3) /* preloadpage->r9 */
lwz 10,104+4(3) /* preloadpage->r10 */
lwz 3,48+4(3) /* preloadpage->r3 */
bctr
/*NOTREACHED*/
trap
.Lfailed:
/* __loadx barfed for some reason. Print the error
message and get out. */
/* First the error msg */
lwz 3,512(1) /* restore r3 */
lwz 2,4(3) /* r2 = __NR_kwrite */
lwz 4,12(3) /* r4 = offset of err msg */
add 4,4,3 /* r4 = err msg */
lwz 5,16(3) /* r5 = length err msg */
li 3,2 /* r3 = stderr */
bl do_syscall
/* now call the diagnosis fn */
lwz 3,512(1) /* restore r3 */
lwz 4,112(3) /* preloadpage->p_diagnose_load_failure */
lwz 2,4(4) /* get its TOC ptr */
lwz 4,0(4) /* get its entry point */
mtlr 4
blrl
/* Now do _exit(1) */
lwz 3,512(1) /* restore r3 */
lwz 2,8(3) /* r2 = __NR_exit */
li 3,1 /* doing _exit(1) */
addi 1,1,1024 /* fix stack pointer */
bl do_syscall
/*NOTREACHED*/
trap
do___loadx:
/* On entry: r2 = __NR___loadx, r6 = name of module */
li 3,1
slwi 3,3,24 /* r3 = 0x1000000 = VKI_DL_LOAD */
mr 4,1
lis 5,3
li 7,0
li 8,0
li 9,0
li 10,0
do_syscall:
crorc 6,6,6
sc
trap
/* sc continues at 'lr', hence this
constitutes an automatic return */
/* See comment in pub_core_trampoline.h for what this is for */
.globl VG_(ppctoc_magic_redirect_return_stub)
VG_(ppctoc_magic_redirect_return_stub):
trap
.globl VG_(trampoline_stuff_end)
VG_(trampoline_stuff_end):
/* and a trailing page of unexecutable code */
UD2_PAGE
# undef UD2_16
# undef UD2_64
# undef UD2_256
# undef UD2_1024
# undef UD2_PAGE
/*---------------- ppc64-aix5 ----------------*/
#else
#if defined(VGP_ppc64_aix5)
# define UD2_16 trap ; trap ; trap; trap
# define UD2_64 UD2_16 ; UD2_16 ; UD2_16 ; UD2_16
# define UD2_256 UD2_64 ; UD2_64 ; UD2_64 ; UD2_64
# define UD2_1024 UD2_256 ; UD2_256 ; UD2_256 ; UD2_256
# define UD2_PAGE UD2_1024 ; UD2_1024 ; UD2_1024 ; UD2_1024
.globl VG_(trampoline_stuff_start)
VG_(trampoline_stuff_start):
/* See pub_core_trampoline.h for an explaination of this. Also
see pub_core_initimg.h, struct AIX5PreloadPage. On entry, r3
points to an AIX5PreloadPage structure. Note we can only
use r2-r10 as scratch registers here since those are the
only ones restored from the preload page when finally
starting the client. */
.globl VG_(ppc64_aix5_do_preloads_then_start_client)
VG_(ppc64_aix5_do_preloads_then_start_client):
stdu 1,-1024(1)
std 3,512(1) /* stash r3 512 bytes up stack */
/* Try to load .../vgpreload_core.so */
lwz 2,0(3) /* r2 = __NR_kload */
lwz 5,20(3) /* r5 = off_preloadcorename */
add 3,3,5 /* r6 = preloadcorename */
bl do_kload
cmpdi 0,3,0
beq .Lfailed
/* Try to load .../vgpreload_tool.so, if it exists */
ld 3,512(1) /* restore r3 */
lwz 2,0(3) /* r2 = __NR_kload */
lwz 5,24(3) /* r5 = off_preloadtoolname */
cmpwi 0,5,0 /* skip tool preload if */
beq .Ltry_preload /* name not present */
add 3,3,5 /* r6 = preloadtoolname */
bl do_kload
cmpdi 0,3,0
beq .Lfailed
.Ltry_preload:
/* Try to load the LD_PRELOAD= file, if it exists */
ld 3,512(1) /* restore r3 */
lwz 2,0(3) /* r2 = __NR_kload */
lwz 5,28(3) /* r5 = off_ld_preloadname */
cmpwi 0,5,0 /* skip ld_preload if */
beq .Lstart_client /* name not present */
add 3,3,5 /* r6 = ld_preloadname */
bl do_kload
cmpdi 0,3,0
beq .Lfailed
.Lstart_client:
/* Success. Restore r2-r10 from preloadpage-> and start
the client. */
ld 3,512(1) /* restore r3 */
addi 1,1,1024
ld 2,32+0(3) /* preloadpage->client_start */
mtctr 2
ld 2,40+0(3) /* preloadpage->r2 */
ld 4,56+0(3) /* preloadpage->r4 */
ld 5,64+0(3) /* preloadpage->r5 */
ld 6,72+0(3) /* preloadpage->r6 */
ld 7,80+0(3) /* preloadpage->r7 */
ld 8,88+0(3) /* preloadpage->r8 */
ld 9,96+0(3) /* preloadpage->r9 */
ld 10,104+0(3) /* preloadpage->r10 */
ld 3,48+0(3) /* preloadpage->r3 */
bctr
/*NOTREACHED*/
trap
.Lfailed:
/* __loadx barfed for some reason. Print the error
message and get out. */
/* First the error msg */
ld 3,512(1) /* restore r3 */
lwz 2,4(3) /* r2 = __NR_kwrite */
lwz 4,12(3) /* r4 = offset of err msg */
add 4,4,3 /* r4 = err msg */
lwz 5,16(3) /* r5 = length err msg */
li 3,2 /* r3 = stderr */
bl do_syscall
/* now call the diagnosis fn */
ld 3,512(1) /* restore r3 */
ld 4,112(3) /* preloadpage->p_diagnose_load_failure */
ld 11,16(4)
ld 2,8(4) /* get its TOC ptr */
ld 4,0(4) /* get its entry point */
mtlr 4
blrl
/* Now do _exit(1) */
lwz 3,512(1) /* restore r3 */
lwz 2,8(3) /* r2 = __NR_exit */
li 3,1 /* doing _exit(1) */
addi 1,1,1024 /* fix stack pointer */
bl do_syscall
/*NOTREACHED*/
trap
do_kload:
/* On entry: r2 = __NR_kload, r3 = name of module */
li 4,0
li 5,0
li 6,0
li 7,0
li 8,0
li 9,0
li 10,0
do_syscall:
crorc 6,6,6
sc
/* sc continues at 'lr', hence this
constitutes an automatic return */
/* See comment in pub_core_trampoline.h for what this is for */
.globl VG_(ppctoc_magic_redirect_return_stub)
VG_(ppctoc_magic_redirect_return_stub):
trap
.globl VG_(trampoline_stuff_end)
VG_(trampoline_stuff_end):
/* and a trailing page of unexecutable code */
UD2_PAGE
# undef UD2_16
# undef UD2_64
# undef UD2_256
# undef UD2_1024
# undef UD2_PAGE
/*---------------- unknown ----------------*/
#else
# error Unknown platform
#endif
#endif
#endif
#endif
#endif
#endif
#if defined(VGO_linux)
/* Let the linker know we don't need an executable stack */
.section .note.GNU-stack,"",@progbits
#endif
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/
|
