This file is indexed.

/usr/share/systemtap/runtime/linux/loc2c-runtime.h is in systemtap-common 2.9-2ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
/* target operations in the Linux kernel mode
 * Copyright (C) 2005-2012 Red Hat Inc.
 * Copyright (C) 2005-2007 Intel Corporation.
 * Copyright (C) 2007 Quentin Barnes.
 *
 * This file is part of systemtap, and is free software.  You can
 * redistribute it and/or modify it under the terms of the GNU General
 * Public License (GPL); either version 2, or (at your option) any
 * later version.
 */

#ifndef _LINUX_LOC2C_RUNTIME_H_
#define _LINUX_LOC2C_RUNTIME_H_

#ifdef STAPCONF_LINUX_UACCESS_H
#include <linux/uaccess.h>
#else
#include <asm/uaccess.h>
#endif
#include <linux/types.h>
#define intptr_t long
#define uintptr_t unsigned long

#include "../loc2c-runtime.h"


#ifndef STAPCONF_PAGEFAULT_DISABLE  /* before linux commit a866374a */
#define pagefault_disable() preempt_disable()
#define pagefault_enable() preempt_enable_no_resched()
#endif


#define k_fetch_register(regno) \
  pt_regs_fetch_register(c->kregs, regno)
#define k_store_register(regno, value) \
  pt_regs_store_register(c->kregs, regno, value)


/* PR 10601: user-space (user_regset) register access.
   Needs arch specific code, only i386 and x86_64 for now.  */
#if ((defined(STAPCONF_REGSET) || defined(STAPCONF_UTRACE_REGSET)) \
     && (defined (__i386__) || defined (__x86_64__)))

#if defined(STAPCONF_REGSET)
#include <linux/regset.h>
#endif

#if defined(STAPCONF_UTRACE_REGSET)
#include <linux/tracehook.h>
/* adapt new names to old decls */
#define user_regset_view utrace_regset_view
#define user_regset utrace_regset
#define task_user_regset_view utrace_native_view

#else // PR13489, inodes-uprobes export kludge
#if !defined(STAPCONF_TASK_USER_REGSET_VIEW_EXPORTED)
// First typedef from the original decl, then #define it as a typecasted call.
// NB: not all archs actually have the function, but the decl is universal in regset.h
typedef typeof(&task_user_regset_view) task_user_regset_view_fn;
/* Special macro to tolerate the kallsyms function pointer being zero. */
#define task_user_regset_view(t) (kallsyms_task_user_regset_view ? \
                                  (* (task_user_regset_view_fn)(kallsyms_task_user_regset_view))((t)) : \
                                  NULL)
#endif
#endif

struct usr_regset_lut {
  char *name;
  unsigned rsn;
  unsigned pos;
};


/* DWARF register number -to- user_regset bank/offset mapping table.
   The register numbers come from the processor-specific ELF documents.
   The user-regset bank/offset values come from kernel $ARCH/include/asm/user*.h
   or $ARCH/kernel/ptrace.c. */
#if defined (__i386__) || defined (__x86_64__)
static const struct usr_regset_lut url_i386[] = {
  { "ax", NT_PRSTATUS, 6*4 },
  { "cx", NT_PRSTATUS, 1*4 },
  { "dx", NT_PRSTATUS, 2*4 },
  { "bx", NT_PRSTATUS, 0*4 },
  { "sp", NT_PRSTATUS, 15*4 },
  { "bp", NT_PRSTATUS, 5*4 },
  { "si", NT_PRSTATUS, 3*4 },
  { "di", NT_PRSTATUS, 4*4 },
  { "ip", NT_PRSTATUS, 12*4 },
};
#endif

#if defined (__x86_64__)
static const struct usr_regset_lut url_x86_64[] = {
  { "rax", NT_PRSTATUS, 10*8 },
  { "rdx", NT_PRSTATUS, 12*8 },
  { "rcx", NT_PRSTATUS, 11*8 },
  { "rbx", NT_PRSTATUS, 5*8 },
  { "rsi", NT_PRSTATUS, 13*8 },
  { "rdi", NT_PRSTATUS, 14*8 },
  { "rbp", NT_PRSTATUS, 4*8 },
  { "rsp", NT_PRSTATUS, 19*8 },
  { "r8", NT_PRSTATUS, 9*8 },
  { "r9", NT_PRSTATUS, 8*8 }, 
  { "r10", NT_PRSTATUS, 7*8 },  
  { "r11", NT_PRSTATUS, 6*8 }, 
  { "r12", NT_PRSTATUS, 3*8 }, 
  { "r13", NT_PRSTATUS, 2*8 }, 
  { "r14", NT_PRSTATUS, 1*8 }, 
  { "r15", NT_PRSTATUS, 0*8 }, 
  { "rip", NT_PRSTATUS, 16*8 }, 
  /* XXX: SSE registers %xmm0-%xmm7 */ 
  /* XXX: SSE2 registers %xmm8-%xmm15 */
  /* XXX: FP registers %st0-%st7 */
  /* XXX: MMX registers %mm0-%mm7 */
};
#endif
/* XXX: insert other architectures here. */


static u32 ursl_fetch32 (const struct usr_regset_lut* lut, unsigned lutsize, int e_machine, unsigned regno)
{
  u32 value = ~0;
  const struct user_regset_view *rsv = task_user_regset_view(current); 
  unsigned rsi;
  int rc;
  unsigned rsn;
  unsigned pos;
  unsigned count;

  WARN_ON (!rsv);
  if (!rsv) goto out;
  WARN_ON (regno >= lutsize);
  if (regno >= lutsize) goto out;
  if (rsv->e_machine != e_machine) goto out;

  rsn = lut[regno].rsn;
  pos = lut[regno].pos;
  count = sizeof(value);

  for (rsi=0; rsi<rsv->n; rsi++)
    if (rsv->regsets[rsi].core_note_type == rsn)
      {
        const struct user_regset *rs = & rsv->regsets[rsi];
        rc = (rs->get)(current, rs, pos, count, & value, NULL);
        WARN_ON (rc);
        /* success */
        goto out;
      }
  WARN_ON (1); /* did not find appropriate regset! */
  
 out:
  return value;
}


static void ursl_store32 (const struct usr_regset_lut* lut,unsigned lutsize,  int e_machine, unsigned regno, u32 value)
{
  const struct user_regset_view *rsv = task_user_regset_view(current); 
  unsigned rsi;
  int rc;
  unsigned rsn;
  unsigned pos;
  unsigned count;

  WARN_ON (!rsv);
  if (!rsv) goto out;
  WARN_ON (regno >= lutsize);
  if (regno >= lutsize) goto out;
  if (rsv->e_machine != e_machine) goto out;

  rsn = lut[regno].rsn;
  pos = lut[regno].pos;
  count = sizeof(value);

  for (rsi=0; rsi<rsv->n; rsi++)
    if (rsv->regsets[rsi].core_note_type == rsn)
      {
        const struct user_regset *rs = & rsv->regsets[rsi];
        rc = (rs->set)(current, rs, pos, count, & value, NULL);
        WARN_ON (rc);
        /* success */
        goto out;
      }
  WARN_ON (1); /* did not find appropriate regset! */
  
 out:
  return;
}


static u64 ursl_fetch64 (const struct usr_regset_lut* lut, unsigned lutsize, int e_machine, unsigned regno)
{
  u64 value = ~0;
  const struct user_regset_view *rsv = task_user_regset_view(current); 
  unsigned rsi;
  int rc;
  unsigned rsn;
  unsigned pos;
  unsigned count;

  if (!rsv) goto out;
  if (regno >= lutsize) goto out;
  if (rsv->e_machine != e_machine) goto out;

  rsn = lut[regno].rsn;
  pos = lut[regno].pos;
  count = sizeof(value);

  for (rsi=0; rsi<rsv->n; rsi++)
    if (rsv->regsets[rsi].core_note_type == rsn)
      {
        const struct user_regset *rs = & rsv->regsets[rsi];
        rc = (rs->get)(current, rs, pos, count, & value, NULL);
        if (rc)
          goto out;
        /* success */
        return value;
      }
 out:
  printk (KERN_WARNING "process %d mach %d regno %d not available for fetch.\n", current->tgid, e_machine, regno);
  return value;
}


static void ursl_store64 (const struct usr_regset_lut* lut,unsigned lutsize,  int e_machine, unsigned regno, u64 value)
{
  const struct user_regset_view *rsv = task_user_regset_view(current); 
  unsigned rsi;
  int rc;
  unsigned rsn;
  unsigned pos;
  unsigned count;

  WARN_ON (!rsv);
  if (!rsv) goto out;
  WARN_ON (regno >= lutsize);
  if (regno >= lutsize) goto out;
  if (rsv->e_machine != e_machine) goto out;

  rsn = lut[regno].rsn;
  pos = lut[regno].pos;
  count = sizeof(value);

  for (rsi=0; rsi<rsv->n; rsi++)
    if (rsv->regsets[rsi].core_note_type == rsn)
      {
        const struct user_regset *rs = & rsv->regsets[rsi];
        rc = (rs->set)(current, rs, pos, count, & value, NULL);
        if (rc)
          goto out;
        /* success */
        return;
      }
  
 out:
  printk (KERN_WARNING "process %d mach %d regno %d not available for store.\n", current->tgid, e_machine, regno);
  return;
}


#if defined (__i386__)

#define u_fetch_register(regno) ursl_fetch32(url_i386, ARRAY_SIZE(url_i386), EM_386, regno)
#define u_store_register(regno,value) ursl_store32(url_i386, ARRAY_SIZE(url_i386), EM_386, regno, value)

#elif defined (__x86_64__)

#define u_fetch_register(regno) (_stp_is_compat_task() ? ursl_fetch32(url_i386, ARRAY_SIZE(url_i386), EM_386, regno) : ursl_fetch64(url_x86_64, ARRAY_SIZE(url_x86_64), EM_X86_64, regno))
#define u_store_register(regno,value)  (_stp_is_compat_task() ? ursl_store32(url_i386, ARRAY_SIZE(url_i386), EM_386, regno, value) : ursl_store64(url_x86_64, ARRAY_SIZE(url_x86_64), EM_X86_64, regno, value))

#endif

#else /* ! STAPCONF_REGSET */

/* Downgrade to pt_dwarf_register access. */

#define u_store_register(regno, value) \
  pt_regs_store_register(c->uregs, regno, value)

/* If we're in a 32/31-bit task in a 64-bit kernel, we need to emulate
 * 32-bitness by masking the output of pt_regs_fetch_register() */
#ifndef CONFIG_COMPAT
#define u_fetch_register(regno) \
  pt_regs_fetch_register(c->uregs, regno)
#else
#define u_fetch_register(regno) \
  (_stp_is_compat_task() ? (0xffffffff & pt_regs_fetch_register(c->uregs, regno)) \
                         : pt_regs_fetch_register(c->uregs, regno))
#endif

#endif /* STAPCONF_REGSET */


/* The deref and store_deref macros are called to safely access addresses
   in the probe context.  These macros are used only for kernel addresses.
   The macros must handle bogus addresses here gracefully (as from
   corrupted data structures, stale pointers, etc), by doing a "goto
   deref_fault".

   On most machines, the asm/uaccess.h macros __get_user_asm and
   __put_user_asm do exactly the low-level work we need to access memory
   with fault handling, and are not actually specific to user-address
   access at all.  Each machine's definition of deref and deref_store here
   must work right for kernel addresses, and can use whatever existing
   machine-specific kernel macros are convenient.  */


/* NB: this autoconf is always disabled, pending further performance eval. */
#if 0 && defined STAPCONF_PROBE_KERNEL

/* Kernel 2.6.26 adds probe_kernel_{read,write}, which lets us write
 * architecture-neutral implementations of kread, kwrite, deref, and
 * store_deref.
 *
 * NB: deref and store_deref shouldn't be used with 64-bit values on 32-bit
 * platforms, because they will lose data in the conversion to intptr_t.  We
 * generally want to encourage using kread and kwrite instead.
 */

#define kread(ptr) ({ \
        typeof(*(ptr)) _v = 0; \
        if (lookup_bad_addr((unsigned long)(ptr), sizeof (*(ptr))) ||	\
            probe_kernel_read((void *)&_v, (void *)(ptr), sizeof(*(ptr)))) \
          DEREF_FAULT(ptr); \
        _v; \
    })
#define uread kread

#define kwrite(ptr, value) ({ \
        typeof(*(ptr)) _v; \
        _v = (typeof(*(ptr)))(value); \
        if (lookup_bad_addr((unsigned long)addr, sizeof (*(ptr))) ||	\
            probe_kernel_write((void *)(ptr), (void *)&_v, sizeof(*(ptr)))) \
          STORE_DEREF_FAULT(ptr); \
    })
#define uwrite kwrite

#define uderef(size, addr) ({ \
    intptr_t _i = 0; \
    switch (size) { \
      case 1: _i = kread((u8 *)(addr)); break; \
      case 2: _i = kread((u16 *)(addr)); break; \
      case 4: _i = kread((u32 *)(addr)); break; \
      case 8: _i = kread((u64 *)(addr)); break; \
      default: __deref_bad(); \
    } \
    _i; \
  })
#define kderef uderef

#define store_uderef(size, addr, value) ({ \
    switch (size) { \
      case 1: kwrite((u8 *)(addr), (value)); break; \
      case 2: kwrite((u16 *)(addr), (value)); break; \
      case 4: kwrite((u32 *)(addr), (value)); break; \
      case 8: kwrite((u64 *)(addr), (value)); break; \
      default: __store_deref_bad(); \
    } \
  })
#define store_kderef store_uderef


extern void __deref_bad(void);
extern void __store_deref_bad(void);

#else /* !STAPCONF_PROBE_KERNEL */

#if defined __i386__

#define _stp_deref(size, addr, seg)                                           \
  ({									      \
    int _bad = 0;							      \
    intptr_t _v = 0;							      \
    mm_segment_t _oldfs = get_fs();                                           \
    set_fs(seg);                                                              \
    pagefault_disable();                                                      \
    if (lookup_bad_addr((unsigned long)addr, size))			      \
      _bad = 1;                                                               \
    else                                                                      \
      switch (size)                                                           \
        {                                                                     \
        case 1: { u8 _b; __get_user_asm(_b,addr,_bad,"b","b","=q",1); _v = _b; } break; \
        case 2: { u16 _w; __get_user_asm(_w,addr,_bad,"w","w","=r",1); _v = _w; } break; \
        case 4: { u32 _l; __get_user_asm(_l,addr,_bad,"l","","=r",1); _v = _l; } break; \
        default: _v = __get_user_bad();                                       \
        }                                                                     \
    pagefault_enable();                                                       \
    set_fs(_oldfs);                                                           \
    if (_bad)                                                                 \
      DEREF_FAULT(addr);						      \
    _v;									      \
  })

#define _stp_store_deref(size, addr, value, seg)                              \
  ({									      \
    int _bad = 0;							      \
    mm_segment_t _oldfs = get_fs();                                           \
    set_fs(seg);                                                              \
    pagefault_disable();                                                      \
    if (lookup_bad_addr((unsigned long)addr, size))			      \
      _bad = 1;                                                               \
    else                                                                      \
      switch (size)                                                           \
        {                                                                     \
        case 1: __put_user_asm(((u8)(value)),addr,_bad,"b","b","iq",1); break;\
        case 2: __put_user_asm(((u16)(value)),addr,_bad,"w","w","ir",1); break;\
        case 4: __put_user_asm(((u32)(value)),addr,_bad,"l","k","ir",1); break;\
        default: __put_user_bad();                                            \
        }                                                                     \
    pagefault_enable();                                                       \
    set_fs(_oldfs);                                                           \
    if (_bad)                                                                 \
      STORE_DEREF_FAULT(addr);                                                \
  })


#elif defined __x86_64__

#define _stp_deref(size, addr, seg)                                           \
  ({									      \
    int _bad = 0;							      \
    intptr_t _v = 0;							      \
    mm_segment_t _oldfs = get_fs();                                           \
    set_fs(seg);                                                              \
    pagefault_disable();                                                      \
    if (lookup_bad_addr((unsigned long)addr, size))			      \
      _bad = 1;                                                               \
    else                                                                      \
      switch (size)                                                           \
        {                                                                     \
        case 1: { u8 _b; __get_user_asm(_b,(unsigned long)addr,_bad,"b","b","=q",1); _v = _b; } break; \
        case 2: { u16 _w; __get_user_asm(_w,(unsigned long)addr,_bad,"w","w","=r",1); _v = _w; } break; \
        case 4: { u32 _l; __get_user_asm(_l,(unsigned long)addr,_bad,"l","","=r",1); _v = _l; } break; \
        case 8: { u64 _q; __get_user_asm(_q,(unsigned long)addr,_bad,"q","","=r",1); _v = _q; } break; \
        default: _v = __get_user_bad();                                       \
        }                                                                     \
    pagefault_enable();                                                       \
    set_fs(_oldfs);                                                           \
    if (_bad)								      \
      DEREF_FAULT(addr);						      \
    _v;									      \
  })

#define _stp_store_deref(size, addr, value, seg)                              \
  ({									      \
    int _bad = 0;							      \
    mm_segment_t _oldfs = get_fs();                                           \
    set_fs(seg);                                                              \
    pagefault_disable();                                                      \
    if (lookup_bad_addr((unsigned long)addr, size))			      \
      _bad = 1;                                                               \
    else                                                                      \
      switch (size)                                                           \
        {                                                                     \
        case 1: __put_user_asm(((u8)(value)),addr,_bad,"b","b","iq",1); break; \
        case 2: __put_user_asm(((u16)(value)),addr,_bad,"w","w","ir",1); break;\
        case 4: __put_user_asm(((u32)(value)),addr,_bad,"l","k","ir",1); break;\
        case 8: __put_user_asm(((u64)(value)),addr,_bad,"q","","Zr",1); break; \
        default: __put_user_bad();                                      \
        }                                                               \
    pagefault_enable();                                                       \
    set_fs(_oldfs);                                                           \
    if (_bad)								      \
      STORE_DEREF_FAULT(addr);						      \
  })

#elif defined __ia64__

#define _stp_deref(size, addr, seg)					\
  ({									\
     int _bad = 0;							\
     intptr_t _v=0;							\
     mm_segment_t _oldfs = get_fs();                                    \
     set_fs(seg);                                                       \
     pagefault_disable();                                               \
     if (lookup_bad_addr((unsigned long)addr, size))			\
       _bad = 1;                                                        \
     else {								\
       switch (size) {                                                  \
	 case 1: __get_user_size(_v, addr, 1, _bad); break; 		\
	 case 2: __get_user_size(_v, addr, 2, _bad); break;  		\
	 case 4: __get_user_size(_v, addr, 4, _bad); break;  		\
	 case 8: __get_user_size(_v, addr, 8, _bad); break;  		\
	 default: __get_user_unknown(); break;				\
	  }								\
     }									\
     pagefault_enable();                                                \
     set_fs(_oldfs);                                                    \
     if (_bad) 								\
       DEREF_FAULT(addr);						\
     _v;								\
   })

#define _stp_store_deref(size, addr, value, seg)                        \
  ({									\
    int _bad=0;								\
    mm_segment_t _oldfs = get_fs();                                     \
    set_fs(seg);                                                        \
    pagefault_disable();                                                \
    if (lookup_bad_addr((unsigned long)addr, size))			\
      _bad = 1;                                                         \
    else                                                                \
      switch (size){							\
      case 1: __put_user_size(value, addr, 1, _bad); break;		\
      case 2: __put_user_size(value, addr, 2, _bad); break;		\
      case 4: __put_user_size(value, addr, 4, _bad); break;		\
      case 8: __put_user_size(value, addr, 8, _bad); break;		\
      default: __put_user_unknown(); break;				\
      }                                                                 \
    pagefault_enable();                                                 \
    set_fs(_oldfs);                                                     \
    if (_bad)								\
	   STORE_DEREF_FAULT(addr);					\
   })

#elif defined __powerpc__ || defined __powerpc64__

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15)
#define __stp_get_user_size(x, ptr, size, retval)		\
		__get_user_size(x, ptr, size, retval)
#define __stp_put_user_size(x, ptr, size, retval)		\
		__put_user_size(x, ptr, size, retval)
#else
#define __stp_get_user_size(x, ptr, size, retval)		\
		__get_user_size(x, ptr, size, retval, -EFAULT)
#define __stp_put_user_size(x, ptr, size, retval)		\
		__put_user_size(x, ptr, size, retval, -EFAULT)
#endif

#define _stp_deref(size, addr, seg)                                           \
  ({									      \
    int _bad = 0;							      \
    intptr_t _v = 0;							      \
    mm_segment_t _oldfs = get_fs();                                           \
    set_fs(seg);                                                              \
    pagefault_disable();                                                      \
    if (lookup_bad_addr((unsigned long)addr, size))			      \
      _bad = 1;                                                               \
    else                                                                      \
      switch (size)                                                           \
        {                                                                     \
	case 1: __stp_get_user_size(_v, addr, 1, _bad); break;                \
	case 2: __stp_get_user_size(_v, addr, 2, _bad); break;                \
	case 4: __stp_get_user_size(_v, addr, 4, _bad); break;                \
	case 8: __stp_get_user_size(_v, addr, 8, _bad); break;                \
        default: _v = __get_user_bad();                                       \
        }                                                                     \
    pagefault_enable();                                                       \
    set_fs(_oldfs);                                                           \
    if (_bad)								      \
      DEREF_FAULT(addr);						      \
    _v;									      \
  })

#define _stp_store_deref(size, addr, value, seg)                              \
  ({									      \
    int _bad = 0;							      \
    mm_segment_t _oldfs = get_fs();                                           \
    set_fs(seg);                                                              \
    pagefault_disable();                                                      \
    if (lookup_bad_addr((unsigned long)addr, size))			      \
      _bad = 1;                                                               \
    else                                                                      \
      switch (size)                                                           \
        {                                                                     \
	case 1: __stp_put_user_size(((u8)(value)), addr, 1, _bad); break;     \
	case 2: __stp_put_user_size(((u16)(value)), addr, 2, _bad); break;    \
	case 4: __stp_put_user_size(((u32)(value)), addr, 4, _bad); break;    \
	case 8: __stp_put_user_size(((u64)(value)), addr, 8, _bad); break;    \
        default: __put_user_bad();                                            \
        }                                                                     \
    pagefault_enable();                                                       \
    set_fs(_oldfs);                                                           \
    if (_bad)								      \
      STORE_DEREF_FAULT(addr);						      \
  })

#elif defined (__aarch64__)

#define _stp_deref(size, addr, seg)                                           \
  ({									      \
    int _bad = 0;							      \
    intptr_t _v = 0;							      \
    mm_segment_t _oldfs = get_fs();                                           \
    set_fs(seg);                                                              \
    pagefault_disable();                                                      \
    if (lookup_bad_addr((unsigned long)addr, size))			      \
      _bad = 1;                                                               \
    else                                                                      \
      switch (size)                                                           \
        {                                                                     \
	case 1: __get_user_asm("ldrb", "%w", _v, (unsigned long)addr, _bad); break;\
	case 2: __get_user_asm("ldrh", "%w",_v, (unsigned long)addr, _bad); break;\
	case 4: __get_user_asm("ldr", "%w",_v,  (unsigned long)addr, _bad); break;\
	case 8: __get_user_asm("ldr", "%",_v,  (unsigned long)addr, _bad); break;\
        default: BUILD_BUG();			                              \
        }                                                                     \
    pagefault_enable();                                                       \
    set_fs(_oldfs);                                                           \
    if (_bad)								      \
      DEREF_FAULT(addr);						      \
    _v;									      \
  })

#define _stp_store_deref(size, addr, value, seg)                              \
  ({									      \
    int _bad = 0;							      \
    mm_segment_t _oldfs = get_fs();                                           \
    set_fs(seg);                                                              \
    pagefault_disable();                                                      \
    if (lookup_bad_addr((unsigned long)addr, size))			      \
      _bad = 1;                                                               \
    else                                                                      \
      switch (size)                                                           \
        {                                                                     \
	case 1: __put_user_asm("strb", "%w", ((u8)(value)), addr, _bad); break;\
	case 2: __put_user_asm("strh", "%w", ((u16)(value)), addr, _bad); break;\
	case 4: __put_user_asm("str", "%w", ((u32)(value)), addr, _bad); break;\
	case 8: __put_user_asm("str", "%", ((u64)(value)), addr, _bad); break;\
        default: BUILD_BUG();                                                 \
        }                                                                     \
    pagefault_enable();                                                       \
    set_fs(_oldfs);                                                           \
    if (_bad)								      \
      STORE_DEREF_FAULT(addr);						      \
  })

#elif defined (__arm__)

/* Macros for ARM lifted from 2.6.21.1's linux/include/asm-arm/uaccess.h
 * and slightly altered. */

#define __stp_get_user_asm_byte(x,addr,err)			\
	__asm__ __volatile__(					\
	"1:	ldrb	%1,[%2],#0\n"				\
	"2:\n"							\
	"	.section .fixup,\"ax\"\n"			\
	"	.align	2\n"					\
	"3:	mov	%0, %3\n"				\
	"	mov	%1, #0\n"				\
	"	b	2b\n"					\
	"	.previous\n"					\
	"	.section __ex_table,\"a\"\n"			\
	"	.align	3\n"					\
	"	.long	1b, 3b\n"				\
	"	.previous"					\
	: "+r" (err), "=&r" (x)					\
	: "r" (addr), "i" (-EFAULT)				\
	: "cc")

#ifndef __ARMEB__
#define __stp_get_user_asm_half(x,__gu_addr,err)		\
({								\
	unsigned long __b1, __b2;				\
	__stp_get_user_asm_byte(__b1, __gu_addr, err);		\
	__stp_get_user_asm_byte(__b2, __gu_addr + 1, err);	\
	(x) = __b1 | (__b2 << 8);				\
})
#else
#define __stp_get_user_asm_half(x,__gu_addr,err)		\
({								\
	unsigned long __b1, __b2;				\
	__stp_get_user_asm_byte(__b1, __gu_addr, err);		\
	__stp_get_user_asm_byte(__b2, __gu_addr + 1, err);	\
	(x) = (__b1 << 8) | __b2;				\
})
#endif

#define __stp_get_user_asm_word(x,addr,err)			\
	__asm__ __volatile__(					\
	"1:	ldr	%1,[%2],#0\n"				\
	"2:\n"							\
	"	.section .fixup,\"ax\"\n"			\
	"	.align	2\n"					\
	"3:	mov	%0, %3\n"				\
	"	mov	%1, #0\n"				\
	"	b	2b\n"					\
	"	.previous\n"					\
	"	.section __ex_table,\"a\"\n"			\
	"	.align	3\n"					\
	"	.long	1b, 3b\n"				\
	"	.previous"					\
	: "+r" (err), "=&r" (x)					\
	: "r" (addr), "i" (-EFAULT)				\
	: "cc")

#define __stp_put_user_asm_byte(x,__pu_addr,err)		\
	__asm__ __volatile__(					\
	"1:	strb	%1,[%2],#0\n"				\
	"2:\n"							\
	"	.section .fixup,\"ax\"\n"			\
	"	.align	2\n"					\
	"3:	mov	%0, %3\n"				\
	"	b	2b\n"					\
	"	.previous\n"					\
	"	.section __ex_table,\"a\"\n"			\
	"	.align	3\n"					\
	"	.long	1b, 3b\n"				\
	"	.previous"					\
	: "+r" (err)						\
	: "r" (x), "r" (__pu_addr), "i" (-EFAULT)		\
	: "cc")

#ifndef __ARMEB__
#define __stp_put_user_asm_half(x,__pu_addr,err)			\
({									\
	unsigned long __temp = (unsigned long)(x);			\
	__stp_put_user_asm_byte(__temp, __pu_addr, err);		\
	__stp_put_user_asm_byte(__temp >> 8, __pu_addr + 1, err);	\
})
#else
#define __stp_put_user_asm_half(x,__pu_addr,err)			\
({									\
	unsigned long __temp = (unsigned long)(x);			\
	__stp_put_user_asm_byte(__temp >> 8, __pu_addr, err);		\
	__stp_put_user_asm_byte(__temp, __pu_addr + 1, err);		\
})
#endif

#define __stp_put_user_asm_word(x,__pu_addr,err)		\
	__asm__ __volatile__(					\
	"1:	str	%1,[%2],#0\n"				\
	"2:\n"							\
	"	.section .fixup,\"ax\"\n"			\
	"	.align	2\n"					\
	"3:	mov	%0, %3\n"				\
	"	b	2b\n"					\
	"	.previous\n"					\
	"	.section __ex_table,\"a\"\n"			\
	"	.align	3\n"					\
	"	.long	1b, 3b\n"				\
	"	.previous"					\
	: "+r" (err)						\
	: "r" (x), "r" (__pu_addr), "i" (-EFAULT)		\
	: "cc")

#define _stp_deref(size, addr, seg)					\
  ({									\
     unsigned long __gu_addr = (unsigned long)(addr);			\
     int _bad = 0;							\
     intptr_t _v=0;							\
     mm_segment_t _oldfs = get_fs();                                    \
     set_fs(seg);                                                       \
     pagefault_disable();                                               \
     if (lookup_bad_addr(__gu_addr, size))				\
      _bad = 1;                                                         \
     else                                                               \
      switch (size){							\
      case 1: __stp_get_user_asm_byte(_v, __gu_addr, _bad); break;	\
      case 2: __stp_get_user_asm_half(_v, __gu_addr, _bad); break;	\
      case 4: __stp_get_user_asm_word(_v, __gu_addr, _bad); break;	\
      default: __get_user_bad(); break;                                 \
      }                                                                 \
    pagefault_enable();                                                 \
    set_fs(_oldfs);                                                     \
    if (_bad)  								\
	DEREF_FAULT(addr);						\
     _v;								\
   })

#define _stp_store_deref(size, addr, value, seg)                        \
  ({									\
    unsigned long __pu_addr = (unsigned long)(addr);			\
    int _bad=0;								\
    mm_segment_t _oldfs = get_fs();					\
    set_fs(seg);							\
    pagefault_disable();						\
    if (lookup_bad_addr(__pu_addr, size))				\
      _bad = 1;                                                         \
    else                                                                \
      switch (size){							\
      case 1: __stp_put_user_asm_byte(value, __pu_addr, _bad); break;	\
      case 2: __stp_put_user_asm_half(value, __pu_addr, _bad); break;	\
      case 4: __stp_put_user_asm_word(value, __pu_addr, _bad); break;	\
      default: __put_user_bad(); break;                                 \
      }                                                                 \
    pagefault_enable();							\
    set_fs(_oldfs);							\
    if (_bad)								\
	   STORE_DEREF_FAULT(addr);						\
   })

#elif defined (__s390__) || defined (__s390x__)

/* Use same __get_user() and __put_user() for both user and kernel
   addresses, but make sure set_fs() is called appropriately first. */

#define _stp_deref(size, addr, seg) ({ \
    u8 _b; u16 _w; u32 _l; u64 _q; \
    uintptr_t _a = (uintptr_t) addr; \
    intptr_t _v = 0; \
    int _bad = 0; \
    mm_segment_t _oldfs = get_fs();                                           \
    set_fs(seg);                                                              \
    pagefault_disable();                                                      \
    if (lookup_bad_addr((unsigned long)addr, size))			\
      _bad = 1;                                                         \
    else switch (size) { \
      case 1: _bad = __get_user(_b, (u8 *)(_a)); _v = _b; break; \
      case 2: _bad = __get_user(_w, (u16 *)(_a)); _v = _w; break; \
      case 4: _bad = __get_user(_l, (u32 *)(_a)); _v = _l; break; \
      case 8: _bad = __get_user(_q, (u64 *)(_a)); _v = _q; break; \
      default: __get_user_bad(); \
    } \
    pagefault_enable();                                                       \
    set_fs(_oldfs);                                                           \
    if (_bad) \
      DEREF_FAULT(addr); \
    _v; \
  })

#define _stp_store_deref(size, addr, value, seg) ({ \
    int _bad = 0; \
    mm_segment_t _oldfs = get_fs();                                           \
    set_fs(seg);                                                              \
    pagefault_disable();                                                      \
    if (lookup_bad_addr((unsigned long)addr, size))			\
      _bad = 1;                                                         \
    else switch (size) {		                                \
      case 1: _bad = __put_user(((u8)(value)), ((u8 *)(addr))); break; \
      case 2: _bad = __put_user(((u16)(value)), ((u16 *)(addr))); break; \
      case 4: _bad = __put_user(((u32)(value)), ((u32 *)(addr))); break; \
      case 8: _bad = __put_user(((u64)(value)), ((u64 *)(addr))); break; \
      default: __put_user_bad(); \
    } \
    pagefault_enable();                                                       \
    set_fs(_oldfs);                                                           \
    if (_bad) \
	STORE_DEREF_FAULT(addr); \
  })

#endif /* (s390) || (s390x) */


/* Map kderef/uderef to the generic segment-aware deref macros. */ 

#ifndef kderef
#define kderef(s,a) _stp_deref(s,a,KERNEL_DS)
#endif

#ifndef store_kderef
#define store_kderef(s,a,v) _stp_store_deref(s,a,v,KERNEL_DS)
#endif

#ifndef uderef
#define uderef(s,a) _stp_deref(s,a,USER_DS)
#endif

#ifndef store_uderef
#define store_uderef(s,a,v) _stp_store_deref(s,a,v,USER_DS)
#endif



#if defined (__i386__) || defined (__arm__)

/* x86 and arm can't do 8-byte put/get_user_asm, so we have to split it */

#define __Xread(ptr, Xderef)				\
  ((sizeof(*(ptr)) == 8) ?				\
       *(typeof(ptr))&(u32[2]) {			\
	 (u32) Xderef(4, &((u32 *)(ptr))[0]),		\
	 (u32) Xderef(4, &((u32 *)(ptr))[1]) }		\
     : (typeof(*(ptr))) Xderef(sizeof(*(ptr)), (ptr)))

#define __Xwrite(ptr, value, store_Xderef)				     \
  ({									     \
    if (sizeof(*(ptr)) == 8) {						     \
      union { typeof(*(ptr)) v; u32 l[2]; } _kw;			     \
      _kw.v = (typeof(*(ptr)))(value);					     \
      store_Xderef(4, &((u32 *)(ptr))[0], _kw.l[0]);			     \
      store_Xderef(4, &((u32 *)(ptr))[1], _kw.l[1]);			     \
    } else								     \
      store_Xderef(sizeof(*(ptr)), (ptr), (long)(typeof(*(ptr)))(value));     \
  })

#else

#define __Xread(ptr, Xderef) \
  ( (typeof(*(ptr))) Xderef(sizeof(*(ptr)), (ptr)) )
#define __Xwrite(ptr, value, store_Xderef) \
  ( store_Xderef(sizeof(*(ptr)), (ptr), (long)(typeof(*(ptr)))(value)) )

#endif

#define kread(ptr) __Xread((ptr), kderef)
#define uread(ptr) __Xread((ptr), uderef)

#define kwrite(ptr, value) __Xwrite((ptr), (value), store_kderef)
#define uwrite(ptr, value) __Xwrite((ptr), (value), store_uderef)

#endif /* STAPCONF_PROBE_KERNEL */

/* Dereference a kernel buffer ADDR of size MAXBYTES. Put the bytes in
 * address DST (which can be NULL).
 *
 * This function is useful for reading memory when the size isn't a
 * size that kderef() handles.  This function is very similar to
 * kderef_string(), but kderef_buffer() doesn't quit when finding a
 * '\0' byte or append a '\0' byte.
 */

#define kderef_buffer(dst, addr, maxbytes)				      \
  ({									      \
    uintptr_t _addr;							      \
    size_t _len;							      \
    unsigned char _c;							      \
    char *_d = (dst);							      \
    for (_len = (maxbytes), _addr = (uintptr_t)(addr);			      \
	 _len > 1;							      \
	 --_len, ++_addr)						      \
      _c = kderef (1, _addr);						      \
      if (_d)								      \
	 *_d++ = _c;							      \
    (dst);								      \
  })

/* The following is for kernel strings, see the uconversions.stp
   tapset for user_string functions. */

#define kderef_string(dst, addr, maxbytes)				      \
  ({									      \
    uintptr_t _addr;							      \
    size_t _len;							      \
    unsigned char _c;							      \
    char *_d = (dst);							      \
    for (_len = (maxbytes), _addr = (uintptr_t)(addr);			      \
	 _len > 1 && (_c = kderef (1, _addr)) != '\0';			      \
	 --_len, ++_addr)						      \
      if (_d)								      \
	 *_d++ = _c;							      \
    if (_d)								      \
      *_d = '\0';							      \
    (dst);								      \
  })

#define store_kderef_string(src, addr, maxbytes)			      \
  ({									      \
    uintptr_t _addr;							      \
    size_t _len;							      \
    char *_s = (src);							      \
    for (_len = (maxbytes), _addr = (uintptr_t)(addr);			      \
	 _len > 1 && _s && *_s != '\0'; --_len, ++_addr)		      \
      store_kderef(1, _addr, *_s++);					      \
    store_kderef(1, _addr, '\0');					      \
  })


#endif /* _LINUX_LOC2C_RUNTIME_H_ */