forked from crash-utility/crash
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy paths390.c
1150 lines (1031 loc) · 32.2 KB
/
s390.c
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
/* s390.c - core analysis suite
*
* Copyright (C) 2001, 2002 Mission Critical Linux, Inc.
* Copyright (C) 2002-2006, 2009-2010, 2012-2013 David Anderson
* Copyright (C) 2002-2006, 2009-2010, 2012-2013 Red Hat, Inc. All rights reserved.
* Copyright (C) 2005, 2006, 2010 Michael Holzheu, IBM Corporation
*
* 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.
*/
#ifdef S390
#include "defs.h"
#define S390_WORD_SIZE 4
#define S390_ADDR_MASK 0x7fffffff
#define S390_PMD_BASE_MASK (~((1UL<<6)-1))
#define S390_PT_BASE_MASK S390_PMD_BASE_MASK
#define S390_PAGE_BASE_MASK (~((1UL<<12)-1))
/* Flags used in entries of page dirs and page tables.
*/
#define S390_PAGE_PRESENT 0x001 /* set: loaded in physical memory
* clear: not loaded in physical mem */
#define S390_RO_S390 0x200 /* HW read-only */
#define S390_PAGE_INVALID 0x400 /* HW invalid */
#define S390_PAGE_INVALID_MASK 0x601ULL /* for linux 2.6 */
#define S390_PAGE_INVALID_NONE 0x401ULL /* for linux 2.6 */
#define S390_PTE_INVALID_MASK 0x80000900
#define S390_PTE_INVALID(x) ((x) & S390_PTE_INVALID_MASK)
#define INT_STACK_SIZE STACKSIZE() // can be 4096 or 8192
#define KERNEL_STACK_SIZE STACKSIZE() // can be 4096 or 8192
#define LOWCORE_SIZE 4096
/*
* declarations of static functions
*/
static void s390_print_lowcore(char*, struct bt_info*,int);
static int s390_kvtop(struct task_context *, ulong, physaddr_t *, int);
static int s390_uvtop(struct task_context *, ulong, physaddr_t *, int);
static int s390_vtop(unsigned long, ulong, physaddr_t*, int);
static ulong s390_vmalloc_start(void);
static int s390_is_task_addr(ulong);
static int s390_verify_symbol(const char *, ulong, char type);
static ulong s390_get_task_pgd(ulong);
static int s390_translate_pte(ulong, void *, ulonglong);
static ulong s390_processor_speed(void);
static int s390_eframe_search(struct bt_info *);
static void s390_back_trace_cmd(struct bt_info *);
static void s390_dump_irq(int);
static void s390_get_stack_frame(struct bt_info *, ulong *, ulong *);
static int s390_dis_filter(ulong, char *, unsigned int);
static void s390_cmd_mach(void);
static int s390_get_smp_cpus(void);
static void s390_display_machine_stats(void);
static void s390_dump_line_number(ulong);
static struct line_number_hook s390_line_number_hooks[];
static int s390_is_uvaddr(ulong, struct task_context *);
/*
* struct lowcore name (old: "_lowcore", new: "lowcore")
*/
static char *lc_struct;
/*
* Initialize member offsets
*/
static void s390_offsets_init(void)
{
if (STRUCT_EXISTS("lowcore"))
lc_struct = "lowcore";
else
lc_struct = "_lowcore";
if (MEMBER_EXISTS(lc_struct, "st_status_fixed_logout"))
MEMBER_OFFSET_INIT(s390_lowcore_psw_save_area, lc_struct,
"st_status_fixed_logout");
else
MEMBER_OFFSET_INIT(s390_lowcore_psw_save_area, lc_struct,
"psw_save_area");
}
/*
* Do all necessary machine-specific setup here. This is called several
* times during initialization.
*/
void
s390_init(int when)
{
switch (when)
{
case PRE_SYMTAB:
machdep->verify_symbol = s390_verify_symbol;
if (pc->flags & KERNEL_DEBUG_QUERY)
return;
machdep->pagesize = memory_page_size();
machdep->pageshift = ffs(machdep->pagesize) - 1;
machdep->pageoffset = machdep->pagesize - 1;
machdep->pagemask = ~((ulonglong)machdep->pageoffset);
// machdep->stacksize = machdep->pagesize * 2;
if ((machdep->pgd = (char *)malloc(SEGMENT_TABLE_SIZE)) == NULL)
error(FATAL, "cannot malloc pgd space.");
machdep->pmd = machdep->pgd;
if ((machdep->ptbl = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc ptbl space.");
machdep->last_pgd_read = 0;
machdep->last_pmd_read = 0;
machdep->last_ptbl_read = 0;
machdep->verify_paddr = generic_verify_paddr;
machdep->ptrs_per_pgd = PTRS_PER_PGD;
break;
case PRE_GDB:
machdep->kvbase = 0;
machdep->identity_map_base = 0;
machdep->is_kvaddr = generic_is_kvaddr;
machdep->is_uvaddr = s390_is_uvaddr;
machdep->eframe_search = s390_eframe_search;
machdep->back_trace = s390_back_trace_cmd;
machdep->processor_speed = s390_processor_speed;
machdep->uvtop = s390_uvtop;
machdep->kvtop = s390_kvtop;
machdep->get_task_pgd = s390_get_task_pgd;
machdep->get_stack_frame = s390_get_stack_frame;
machdep->get_stackbase = generic_get_stackbase;
machdep->get_stacktop = generic_get_stacktop;
machdep->translate_pte = s390_translate_pte;
machdep->memory_size = generic_memory_size;
machdep->is_task_addr = s390_is_task_addr;
machdep->dis_filter = s390_dis_filter;
machdep->cmd_mach = s390_cmd_mach;
machdep->get_smp_cpus = s390_get_smp_cpus;
machdep->line_number_hooks = s390_line_number_hooks;
machdep->value_to_symbol = generic_machdep_value_to_symbol;
machdep->init_kernel_pgd = NULL;
vt->flags |= COMMON_VADDR;
break;
case POST_GDB:
machdep->nr_irqs = 0; /* TBD */
machdep->vmalloc_start = s390_vmalloc_start;
machdep->dump_irq = s390_dump_irq;
if (!machdep->hz)
machdep->hz = HZ;
machdep->section_size_bits = _SECTION_SIZE_BITS;
machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
s390_offsets_init();
break;
case POST_INIT:
break;
}
}
/*
* Dump machine dependent information
*/
void
s390_dump_machdep_table(ulong arg)
{
int others;
others = 0;
fprintf(fp, " flags: %lx (", machdep->flags);
if (machdep->flags & KSYMS_START)
fprintf(fp, "%sKSYMS_START", others++ ? "|" : "");
fprintf(fp, ")\n");
fprintf(fp, " kvbase: %lx\n", machdep->kvbase);
fprintf(fp, " identity_map_base: %lx\n", machdep->kvbase);
fprintf(fp, " pagesize: %d\n", machdep->pagesize);
fprintf(fp, " pageshift: %d\n", machdep->pageshift);
fprintf(fp, " pagemask: %llx\n", machdep->pagemask);
fprintf(fp, " pageoffset: %lx\n", machdep->pageoffset);
fprintf(fp, " stacksize: %ld\n", machdep->stacksize);
fprintf(fp, " hz: %d\n", machdep->hz);
fprintf(fp, " mhz: %ld\n", machdep->mhz);
fprintf(fp, " memsize: %lld (0x%llx)\n",
(ulonglong)machdep->memsize, (ulonglong)machdep->memsize);
fprintf(fp, " bits: %d\n", machdep->bits);
fprintf(fp, " nr_irqs: %d\n", machdep->nr_irqs);
fprintf(fp, " eframe_search: s390_eframe_search()\n");
fprintf(fp, " back_trace: s390_back_trace_cmd()\n");
fprintf(fp, " processor_speed: s390_processor_speed()\n");
fprintf(fp, " uvtop: s390_uvtop()\n");
fprintf(fp, " kvtop: s390_kvtop()\n");
fprintf(fp, " get_task_pgd: s390_get_task_pgd()\n");
fprintf(fp, " dump_irq: s390_dump_irq()\n");
fprintf(fp, " get_stack_frame: s390_get_stack_frame()\n");
fprintf(fp, " get_stackbase: generic_get_stackbase()\n");
fprintf(fp, " get_stacktop: generic_get_stacktop()\n");
fprintf(fp, " translate_pte: s390_translate_pte()\n");
fprintf(fp, " memory_size: generic_memory_size()\n");
fprintf(fp, " vmalloc_start: s390_vmalloc_start()\n");
fprintf(fp, " is_task_addr: s390_is_task_addr()\n");
fprintf(fp, " verify_symbol: s390_verify_symbol()\n");
fprintf(fp, " dis_filter: s390_dis_filter()\n");
fprintf(fp, " cmd_mach: s390_cmd_mach()\n");
fprintf(fp, " get_smp_cpus: s390_get_smp_cpus()\n");
fprintf(fp, " is_kvaddr: generic_is_kvaddr()\n");
fprintf(fp, " is_uvaddr: s390_is_uvaddr()\n");
fprintf(fp, " verify_paddr: generic_verify_paddr()\n");
fprintf(fp, " init_kernel_pgd: NULL\n");
fprintf(fp, " value_to_symbol: generic_machdep_value_to_symbol()\n");
fprintf(fp, " line_number_hooks: s390_line_number_hooks\n");
fprintf(fp, " last_pgd_read: %lx\n", machdep->last_pgd_read);
fprintf(fp, " last_pmd_read: %lx\n", machdep->last_pmd_read);
fprintf(fp, " last_ptbl_read: %lx\n", machdep->last_ptbl_read);
fprintf(fp, " pgd: %lx\n", (ulong)machdep->pgd);
fprintf(fp, " pmd: %lx\n", (ulong)machdep->pmd);
fprintf(fp, " ptbl: %lx\n", (ulong)machdep->ptbl);
fprintf(fp, " ptrs_per_pgd: %d\n", machdep->ptrs_per_pgd);
fprintf(fp, " max_physmem_bits: %ld\n", machdep->max_physmem_bits);
fprintf(fp, " section_size_bits: %ld\n", machdep->section_size_bits);
fprintf(fp, " machspec: %lx\n", (ulong)machdep->machspec);
}
/*
* Check if address is in context's address space
*/
static int
s390_is_uvaddr(ulong vaddr, struct task_context *tc)
{
return IN_TASK_VMA(tc->task, vaddr);
}
/*
* Translates a user virtual address to its physical address
*/
static int
s390_uvtop(struct task_context *tc, ulong vaddr, physaddr_t *paddr, int verbose)
{
unsigned long pgd_base;
readmem(tc->mm_struct + OFFSET(mm_struct_pgd), KVADDR,
&pgd_base,sizeof(long), "pgd_base",FAULT_ON_ERROR);
return s390_vtop(pgd_base, vaddr, paddr, verbose);
}
/*
* Translates a kernel virtual address to its physical address
*/
static int
s390_kvtop(struct task_context *tc, ulong vaddr, physaddr_t *paddr, int verbose)
{
unsigned long pgd_base;
if (!IS_KVADDR(vaddr)){
*paddr = 0;
return FALSE;
}
if (!vt->vmalloc_start) {
*paddr = VTOP(vaddr);
return TRUE;
}
if (!IS_VMALLOC_ADDR(vaddr)) {
*paddr = VTOP(vaddr);
return TRUE;
}
pgd_base = (unsigned long)vt->kernel_pgd[0];
return s390_vtop(pgd_base, vaddr, paddr, verbose);
}
/*
* Check if page is mapped
*/
static inline int
s390_pte_present(unsigned long x)
{
if(THIS_KERNEL_VERSION >= LINUX(2,6,0)) {
return !((x) & S390_PAGE_INVALID) ||
((x) & S390_PAGE_INVALID_MASK)==S390_PAGE_INVALID_NONE;
} else {
return((x) & S390_PAGE_PRESENT);
}
}
/*
* page table traversal functions
*/
/* Segment table traversal function */
static ulong _kl_sg_table_deref_s390(ulong vaddr, ulong table, int len)
{
ulong offset, entry;
offset = ((vaddr >> 20) & 0x7ffUL) * 4;
if (offset >= (len + 1)*64)
/* Offset is over the table limit. */
return 0;
readmem(table + offset, KVADDR, &entry, sizeof(entry), "entry",
FAULT_ON_ERROR);
/*
* Check if the segment table entry could be read and doesn't have
* any of the reserved bits set.
*/
if (entry & 0x80000000UL)
return 0;
/* Check if the segment table entry has the invalid bit set. */
if (entry & 0x40UL)
return 0;
/* Segment table entry is valid and well formed. */
return entry;
}
/* Page table traversal function */
static ulong _kl_pg_table_deref_s390(ulong vaddr, ulong table, int len)
{
ulong offset, entry;
offset = ((vaddr >> 12) & 0xffUL) * 4;
if (offset >= (len + 1)*64)
/* Offset is over the table limit. */
return 0;
readmem(table + offset, KVADDR, &entry, sizeof(entry), "entry",
FAULT_ON_ERROR);
/*
* Check if the page table entry could be read and doesn't have
* any of the reserved bits set.
*/
if (entry & 0x80000900UL)
return 0;
/* Check if the page table entry has the invalid bit set. */
if (entry & 0x400UL)
return 0;
/* Page table entry is valid and well formed. */
return entry;
}
/* lookup virtual address in page tables */
static int
s390_vtop(unsigned long table, ulong vaddr, physaddr_t *phys_addr, int verbose)
{
ulong entry, paddr;
int len;
/*
* Get the segment table entry.
* We assume that the segment table length field in the asce
* is set to the maximum value of 127 (which translates to
* a segment table with 2048 entries) and that the addressing
* mode is 31 bit.
*/
entry = _kl_sg_table_deref_s390(vaddr, table, 127);
if (!entry)
return FALSE;
table = entry & 0x7ffffc00UL;
len = entry & 0xfUL;
/* Get the page table entry */
entry = _kl_pg_table_deref_s390(vaddr, table, len);
if (!entry)
return FALSE;
/* Isolate the page origin from the page table entry. */
paddr = entry & 0x7ffff000UL;
/* Add the page offset and return the final value. */
*phys_addr = paddr + (vaddr & 0xfffUL);
return TRUE;
}
/*
* Determine where vmalloc'd memory starts.
*/
static ulong
s390_vmalloc_start(void)
{
unsigned long highmem_addr,high_memory;
highmem_addr=symbol_value("high_memory");
readmem(highmem_addr, PHYSADDR, &high_memory,sizeof(long),
"highmem",FAULT_ON_ERROR);
return high_memory;
}
/*
* Check if address can be a valid task_struct
*/
static int
s390_is_task_addr(ulong task)
{
if (tt->flags & THREAD_INFO)
return IS_KVADDR(task);
else
return (IS_KVADDR(task) && (ALIGNED_STACK_OFFSET(task) == 0));
}
/*
* return MHz - unfortunately it is not possible to get this on linux
* for zSeries
*/
static ulong
s390_processor_speed(void)
{
return 0;
}
/*
* Accept or reject a symbol from the kernel namelist.
*/
static int
s390_verify_symbol(const char *name, ulong value, char type)
{
int i;
if (CRASHDEBUG(8) && name && strlen(name))
fprintf(fp, "%08lx %s\n", value, name);
if (STREQ(name, "startup") || STREQ(name, "_stext"))
machdep->flags |= KSYMS_START;
if (!name || !strlen(name) || !(machdep->flags & KSYMS_START))
return FALSE;
if ((type == 'A') && STRNEQ(name, "__crc_"))
return FALSE;
if (STREQ(name, "Letext") || STREQ(name, "gcc2_compiled."))
return FALSE;
/* reject L2^B symbols */
if (strstr(name, "L2\002") == name)
return FALSE;
/* throw away all symbols containing a '.' */
for(i = 0; i < strlen(name);i++){
if(name[i] == '.')
return FALSE;
}
return TRUE;
}
/*
* Get the relevant page directory pointer from a task structure.
*/
static ulong
s390_get_task_pgd(ulong task)
{
return (error(FATAL, "s390_get_task_pgd: TBD\n"));
}
/*
* Translate a PTE, returning TRUE if the page is present.
* If a physaddr pointer is passed in, don't print anything.
*/
static int
s390_translate_pte(ulong pte, void *physaddr, ulonglong unused)
{
char *arglist[MAXARGS];
char buf[BUFSIZE];
char buf2[BUFSIZE];
char buf3[BUFSIZE];
char ptebuf[BUFSIZE];
int c,len1,len2,len3;
if(S390_PTE_INVALID(pte)){
fprintf(fp,"PTE is invalid\n");
return FALSE;
}
if(physaddr)
*((ulong *)physaddr) = pte & S390_PAGE_BASE_MASK;
if(!s390_pte_present(pte)){
swap_location(pte, buf);
if ((c = parse_line(buf, arglist)) != 3)
error(FATAL, "cannot determine swap location\n");
sprintf(ptebuf, "%lx", pte);
len1 = MAX(strlen(ptebuf), strlen("PTE"));
len2 = MAX(strlen(arglist[0]), strlen("SWAP"));
len3 = MAX(strlen(arglist[2]), strlen("OFFSET"));
fprintf(fp, "%s %s %s\n",
mkstring(ptebuf, len1, CENTER|LJUST, "PTE"),
mkstring(buf2, len2, CENTER|LJUST, "SWAP"),
mkstring(buf3, len3, CENTER|LJUST, "OFFSET"));
sprintf(ptebuf, "%lx", pte);
strcpy(buf2, arglist[0]);
strcpy(buf3, arglist[2]);
fprintf(fp, "%s %s %s\n",
mkstring(ptebuf, len1, CENTER|RJUST, NULL),
mkstring(buf2, len2, CENTER|RJUST, NULL),
mkstring(buf3, len3, CENTER|RJUST, NULL));
return FALSE;
}
fprintf(fp,"PTE PHYSICAL FLAGS\n");
fprintf(fp,"%08lx %08lx",pte, pte & S390_PAGE_BASE_MASK);
fprintf(fp," (");
if(pte & S390_PAGE_INVALID)
fprintf(fp,"INVALID ");
if(pte & S390_RO_S390)
fprintf(fp,"PROTECTION");
fprintf(fp,")");
return TRUE;
}
/*
* Look for likely exception frames in a stack.
*/
static int
s390_eframe_search(struct bt_info *bt)
{
if(bt->flags & BT_EFRAME_SEARCH2)
return (error(FATAL,
"Option '-E' is not implemented for this architecture\n"));
else
return (error(FATAL,
"Option '-e' is not implemented for this architecture\n"));
}
/*
* returns cpu number of task
*/
static int
s390_cpu_of_task(unsigned long task)
{
int cpu;
if(VALID_MEMBER(task_struct_processor)){
/* linux 2.4 */
readmem(task + OFFSET(task_struct_processor),KVADDR,
&cpu, sizeof(cpu), "task_struct_processor",
FAULT_ON_ERROR);
} else {
char thread_info[8192];
unsigned long thread_info_addr;
readmem(task + OFFSET(task_struct_thread_info),KVADDR,
&thread_info_addr, sizeof(thread_info_addr),
"thread info addr", FAULT_ON_ERROR);
readmem(thread_info_addr,KVADDR,thread_info,sizeof(thread_info),
"thread info", FAULT_ON_ERROR);
cpu = *((int*) &thread_info[OFFSET(thread_info_cpu)]);
}
return cpu;
}
/*
* returns true, if task of bt currently is executed by a cpu
*/
static int
s390_has_cpu(struct bt_info *bt)
{
int cpu = bt->tc->processor;
if (is_task_active(bt->task) && (kt->cpu_flags[cpu] & ONLINE))
return TRUE;
else
return FALSE;
}
/*
* read lowcore for cpu
*/
static void
s390_get_lowcore(int cpu, char* lowcore)
{
unsigned long lowcore_array,lowcore_ptr;
lowcore_array = symbol_value("lowcore_ptr");
readmem(lowcore_array + cpu * S390_WORD_SIZE,KVADDR,
&lowcore_ptr, sizeof(long), "lowcore_ptr", FAULT_ON_ERROR);
readmem(lowcore_ptr, KVADDR, lowcore, LOWCORE_SIZE, "lowcore",
FAULT_ON_ERROR);
}
/*
* Read interrupt stack (either "async_stack" or "panic_stack");
*/
static void s390_get_int_stack(char *stack_name, char* lc, char* int_stack,
unsigned long* start, unsigned long* end)
{
unsigned long stack_addr;
if (!MEMBER_EXISTS(lc_struct, stack_name))
return;
stack_addr = ULONG(lc + MEMBER_OFFSET(lc_struct, stack_name));
if (stack_addr == 0)
return;
readmem(stack_addr - INT_STACK_SIZE, KVADDR, int_stack,
INT_STACK_SIZE, stack_name, FAULT_ON_ERROR);
*start = stack_addr - INT_STACK_SIZE;
*end = stack_addr;
}
/*
* Unroll a kernel stack.
*/
static void
s390_back_trace_cmd(struct bt_info *bt)
{
char* stack;
char async_stack[INT_STACK_SIZE];
char panic_stack[INT_STACK_SIZE];
long ksp,backchain,old_backchain;
int i=0, r14_offset,bc_offset,r14, skip_first_frame=0;
unsigned long async_start = 0, async_end = 0;
unsigned long panic_start = 0, panic_end = 0;
unsigned long stack_end, stack_start, stack_base;
char buf[BUFSIZE];
int cpu = bt->tc->processor;
if (bt->hp && bt->hp->eip) {
error(WARNING,
"instruction pointer argument ignored on this architecture!\n");
}
if (is_task_active(bt->task) && !(kt->cpu_flags[cpu] & ONLINE)) {
fprintf(fp, " CPU offline\n");
return;
}
ksp = bt->stkptr;
/* print lowcore and get async stack when task has cpu */
if(s390_has_cpu(bt)){
char lowcore[LOWCORE_SIZE];
unsigned long psw_flags;
int cpu = s390_cpu_of_task(bt->task);
if (ACTIVE()) {
fprintf(fp,"(active)\n");
return;
}
s390_get_lowcore(cpu,lowcore);
psw_flags = ULONG(lowcore + OFFSET(s390_lowcore_psw_save_area));
if(psw_flags & 0x10000UL){
fprintf(fp,"Task runs in userspace\n");
s390_print_lowcore(lowcore,bt,0);
return;
}
s390_get_int_stack("async_stack", lowcore, async_stack,
&async_start, &async_end);
s390_get_int_stack("panic_stack", lowcore, panic_stack,
&panic_start, &panic_end);
s390_print_lowcore(lowcore,bt,1);
fprintf(fp,"\n");
skip_first_frame=1;
}
/* get task stack start and end */
if(THIS_KERNEL_VERSION >= LINUX(2,6,0)){
readmem(bt->task + OFFSET(task_struct_thread_info),KVADDR,
&stack_start, sizeof(long), "thread info",
FAULT_ON_ERROR);
} else {
stack_start = bt->task;
}
stack_end = stack_start + KERNEL_STACK_SIZE;
if(!STRUCT_EXISTS("stack_frame")){
r14_offset = 56;
bc_offset=0;
} else {
r14_offset = MEMBER_OFFSET("stack_frame","gprs") +
8 * S390_WORD_SIZE;
bc_offset = MEMBER_OFFSET("stack_frame","back_chain");
}
backchain = ksp;
do {
unsigned long r14_stack_off;
struct load_module *lm;
int j;
ulong offset;
char *name_plus_offset;
struct syment *sp;
/* Find stack: Either async, panic stack or task stack */
if((backchain > stack_start) && (backchain < stack_end)){
stack = bt->stackbuf;
stack_base = stack_start;
} else if((backchain > async_start) && (backchain < async_end)
&& s390_has_cpu(bt)){
stack = async_stack;
stack_base = async_start;
} else if((backchain > panic_start) && (backchain < panic_end)
&& s390_has_cpu(bt)){
stack = panic_stack;
stack_base = panic_start;
} else {
/* invalid stackframe */
break;
}
r14_stack_off=backchain - stack_base + r14_offset;
r14 = ULONG(&stack[r14_stack_off]) & S390_ADDR_MASK;
/* print function name */
if(BT_REFERENCE_CHECK(bt)){
if(bt->ref->cmdflags & BT_REF_HEXVAL){
if(r14 == bt->ref->hexval)
bt->ref->cmdflags |= BT_REF_FOUND;
} else {
if(STREQ(closest_symbol(r14),bt->ref->str))
bt->ref->cmdflags |= BT_REF_FOUND;
}
} else if(skip_first_frame){
skip_first_frame=0;
} else {
fprintf(fp," #%i [%08lx] ",i,backchain);
name_plus_offset = NULL;
if (bt->flags & BT_SYMBOL_OFFSET) {
sp = value_search(r14, &offset);
if (sp && offset)
name_plus_offset =
value_to_symstr(r14, buf, bt->radix);
}
fprintf(fp,"%s at %x", name_plus_offset ?
name_plus_offset : closest_symbol(r14), r14);
if (module_symbol(r14, NULL, &lm, NULL, 0))
fprintf(fp, " [%s]", lm->mod_name);
fprintf(fp, "\n");
if (bt->flags & BT_LINE_NUMBERS)
s390_dump_line_number(r14);
i++;
}
old_backchain=backchain;
backchain = ULONG(&stack[backchain - stack_base + bc_offset]);
/* print stack content if -f is specified */
if((bt->flags & BT_FULL) && !BT_REFERENCE_CHECK(bt)){
int frame_size;
if(backchain == 0){
frame_size = stack_base - old_backchain
+ KERNEL_STACK_SIZE;
} else {
frame_size = MIN((backchain - old_backchain),
(stack_base - old_backchain +
KERNEL_STACK_SIZE));
}
for(j=0; j< frame_size; j+=4){
if(j % 16 == 0){
fprintf(fp,"\n%08lx: ",old_backchain+j);
}
fprintf(fp," %s", format_stack_entry(bt, buf,
ULONG(&stack[old_backchain - stack_base + j]), 0));
}
fprintf(fp,"\n\n");
}
/* Check for interrupt stackframe */
if((backchain == 0) && (stack == async_stack)){
unsigned long psw_flags,r15;
psw_flags = ULONG(&stack[old_backchain - stack_base
+96 +MEMBER_OFFSET("pt_regs","psw")]);
if(psw_flags & 0x10000UL){
/* User psw: should not happen */
break;
}
r15 = ULONG(&stack[old_backchain - stack_base +
96 + MEMBER_OFFSET("pt_regs",
"gprs") + 15 * S390_WORD_SIZE]);
backchain=r15;
fprintf(fp," - Interrupt -\n");
}
} while(backchain != 0);
}
/*
* print lowcore info (psw and all registers)
*/
static void
s390_print_lowcore(char* lc, struct bt_info *bt, int show_symbols)
{
char* ptr;
unsigned long tmp[4];
ptr = lc + OFFSET(s390_lowcore_psw_save_area);
tmp[0]=ULONG(ptr);
tmp[1]=ULONG(ptr + S390_WORD_SIZE);
if(BT_REFERENCE_CHECK(bt)){
if(bt->ref->cmdflags & BT_REF_HEXVAL){
if(tmp[1] == bt->ref->hexval)
bt->ref->cmdflags |= BT_REF_FOUND;
} else {
if(STREQ(closest_symbol(tmp[1]),bt->ref->str))
bt->ref->cmdflags |= BT_REF_FOUND;
}
return;
}
fprintf(fp," LOWCORE INFO:\n");
fprintf(fp," -psw : %#010lx %#010lx\n", tmp[0],
tmp[1]);
if(show_symbols){
fprintf(fp," -function : %s at %lx\n",
closest_symbol(tmp[1] & S390_ADDR_MASK),
tmp[1] & S390_ADDR_MASK);
if (bt->flags & BT_LINE_NUMBERS)
s390_dump_line_number(tmp[1] & S390_ADDR_MASK);
}
ptr = lc + MEMBER_OFFSET(lc_struct, "cpu_timer_save_area");
tmp[0]=UINT(ptr);
tmp[1]=UINT(ptr + S390_WORD_SIZE);
fprintf(fp," -cpu timer: %#010lx %#010lx\n", tmp[0],tmp[1]);
ptr = lc + MEMBER_OFFSET(lc_struct, "clock_comp_save_area");
tmp[0]=UINT(ptr);
tmp[1]=UINT(ptr + S390_WORD_SIZE);
fprintf(fp," -clock cmp: %#010lx %#010lx\n", tmp[0], tmp[1]);
fprintf(fp," -general registers:\n");
ptr = lc + MEMBER_OFFSET(lc_struct, "gpregs_save_area");
tmp[0]=ULONG(ptr);
tmp[1]=ULONG(ptr + S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 2 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 3 * S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0],tmp[1],tmp[2],tmp[3]);
tmp[0]=ULONG(ptr + 4 * S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 5 * S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 6 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 7 * S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0],tmp[1],tmp[2],tmp[3]);
tmp[0]=ULONG(ptr + 8 * S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 9 * S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 10* S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 11* S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0],tmp[1],tmp[2],tmp[3]);
tmp[0]=ULONG(ptr + 12* S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 13* S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 14* S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 15* S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
fprintf(fp," -access registers:\n");
ptr = lc + MEMBER_OFFSET(lc_struct, "access_regs_save_area");
tmp[0]=ULONG(ptr);
tmp[1]=ULONG(ptr + S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 2 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 3 * S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
tmp[0]=ULONG(ptr + 4 * S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 5 * S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 6 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 7 * S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
tmp[0]=ULONG(ptr + 8 * S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 9 * S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 10* S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 11* S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
tmp[0]=ULONG(ptr + 12* S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 13* S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 14* S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 15* S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
fprintf(fp," -control registers:\n");
ptr = lc + MEMBER_OFFSET(lc_struct, "cregs_save_area");
tmp[0]=ULONG(ptr);
tmp[1]=ULONG(ptr + S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 2 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 3 * S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
tmp[0]=ULONG(ptr + 4 * S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 5 * S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 6 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 7 * S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
tmp[0]=ULONG(ptr + 8 * S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 9 * S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 10 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 11 * S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
tmp[0]=ULONG(ptr + 12 * S390_WORD_SIZE);
tmp[1]=ULONG(ptr + 13 * S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 14 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 15 * S390_WORD_SIZE);
fprintf(fp," %#010lx %#010lx %#010lx %#010lx\n",
tmp[0], tmp[1], tmp[2], tmp[3]);
ptr = lc + MEMBER_OFFSET(lc_struct, "floating_pt_save_area");
fprintf(fp," -floating point registers 0,2,4,6:\n");
tmp[0]=ULONG(ptr);
tmp[1]=ULONG(ptr + 2 * S390_WORD_SIZE);
tmp[2]=ULONG(ptr + 4 * S390_WORD_SIZE);
tmp[3]=ULONG(ptr + 6 * S390_WORD_SIZE);
fprintf(fp," %#018lx %#018lx\n", tmp[0], tmp[1]);
fprintf(fp," %#018lx %#018lx\n", tmp[2], tmp[3]);
}
/*
* Get a stack frame combination of pc and ra from the most relevent spot.
*/
static void
s390_get_stack_frame(struct bt_info *bt, ulong *eip, ulong *esp)
{
unsigned long ksp, r14;
int r14_offset;
char lowcore[LOWCORE_SIZE];
if(s390_has_cpu(bt))
s390_get_lowcore(s390_cpu_of_task(bt->task),lowcore);
/* get the stack pointer */
if(esp){
if(s390_has_cpu(bt)){
ksp = ULONG(lowcore + MEMBER_OFFSET(lc_struct,
"gpregs_save_area") + (15 * S390_WORD_SIZE));
} else {
readmem(bt->task + OFFSET(task_struct_thread_ksp),
KVADDR, &ksp, sizeof(void *),
"thread_struct ksp", FAULT_ON_ERROR);
}
*esp = ksp;
} else {
/* for 'bt -S' */
ksp=bt->hp->esp;
}
/* get the instruction address */
if(!eip)
return;
if(s390_has_cpu(bt) && esp){
*eip = ULONG(lowcore + OFFSET(s390_lowcore_psw_save_area) +
S390_WORD_SIZE) & S390_ADDR_MASK;
} else {
if(!STRUCT_EXISTS("stack_frame")){
r14_offset = 56;
} else {
r14_offset = MEMBER_OFFSET("stack_frame","gprs") +
8 * S390_WORD_SIZE;
}
readmem(ksp + r14_offset,KVADDR,&r14,sizeof(void*),"eip",
FAULT_ON_ERROR);
*eip=r14 & S390_ADDR_MASK;
}
}
/*
* cmd_irq() is not implemented for s390.
*/
static void
s390_dump_irq(int irq)
{
error(FATAL, "s390_dump_irq: TBD\n");
}
/*
* Filter disassembly output if the output radix is not gdb's default 10
*/
static int
s390_dis_filter(ulong vaddr, char *inbuf, unsigned int output_radix)
{
char buf1[BUFSIZE];
char buf2[BUFSIZE];
char *colon, *p1;
int argc;
char *argv[MAXARGS];
ulong value;
if (!inbuf)
return TRUE;
/*
* For some reason gdb can go off into the weeds translating text addresses,
* so this routine both fixes the references as well as imposing the current
* output radix on the translations.
*/
console("IN: %s", inbuf);
colon = strstr(inbuf, ":");
if (colon) {
sprintf(buf1, "0x%lx <%s>", vaddr,
value_to_symstr(vaddr, buf2, output_radix));
sprintf(buf2, "%s%s", buf1, colon);
strcpy(inbuf, buf2);
}
strcpy(buf1, inbuf);
argc = parse_line(buf1, argv);
if ((FIRSTCHAR(argv[argc-1]) == '<') &&
(LASTCHAR(argv[argc-1]) == '>')) {