x86_64 ia32 ptrace: convert to compat_arch_ptrace
[linux-2.6.git] / arch / x86 / kernel / ptrace.c
1 /* By Ross Biro 1/23/92 */
2 /*
3  * Pentium III FXSR, SSE support
4  *      Gareth Hughes <gareth@valinux.com>, May 2000
5  *
6  * BTS tracing
7  *      Markus Metzger <markus.t.metzger@intel.com>, Dec 2007
8  */
9
10 #include <linux/kernel.h>
11 #include <linux/sched.h>
12 #include <linux/mm.h>
13 #include <linux/smp.h>
14 #include <linux/errno.h>
15 #include <linux/ptrace.h>
16 #include <linux/regset.h>
17 #include <linux/user.h>
18 #include <linux/elf.h>
19 #include <linux/security.h>
20 #include <linux/audit.h>
21 #include <linux/seccomp.h>
22 #include <linux/signal.h>
23
24 #include <asm/uaccess.h>
25 #include <asm/pgtable.h>
26 #include <asm/system.h>
27 #include <asm/processor.h>
28 #include <asm/i387.h>
29 #include <asm/debugreg.h>
30 #include <asm/ldt.h>
31 #include <asm/desc.h>
32 #include <asm/prctl.h>
33 #include <asm/proto.h>
34 #include <asm/ds.h>
35
36 #include "tls.h"
37
38 enum x86_regset {
39         REGSET_GENERAL,
40         REGSET_FP,
41         REGSET_XFP,
42         REGSET_TLS,
43 };
44
45 /*
46  * does not yet catch signals sent when the child dies.
47  * in exit.c or in signal.c.
48  */
49
50 /*
51  * Determines which flags the user has access to [1 = access, 0 = no access].
52  */
53 #define FLAG_MASK_32            ((unsigned long)                        \
54                                  (X86_EFLAGS_CF | X86_EFLAGS_PF |       \
55                                   X86_EFLAGS_AF | X86_EFLAGS_ZF |       \
56                                   X86_EFLAGS_SF | X86_EFLAGS_TF |       \
57                                   X86_EFLAGS_DF | X86_EFLAGS_OF |       \
58                                   X86_EFLAGS_RF | X86_EFLAGS_AC))
59
60 /*
61  * Determines whether a value may be installed in a segment register.
62  */
63 static inline bool invalid_selector(u16 value)
64 {
65         return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL);
66 }
67
68 #ifdef CONFIG_X86_32
69
70 #define FLAG_MASK               FLAG_MASK_32
71
72 static long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
73 {
74         BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
75         regno >>= 2;
76         if (regno > FS)
77                 --regno;
78         return &regs->bx + regno;
79 }
80
81 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
82 {
83         /*
84          * Returning the value truncates it to 16 bits.
85          */
86         unsigned int retval;
87         if (offset != offsetof(struct user_regs_struct, gs))
88                 retval = *pt_regs_access(task_pt_regs(task), offset);
89         else {
90                 retval = task->thread.gs;
91                 if (task == current)
92                         savesegment(gs, retval);
93         }
94         return retval;
95 }
96
97 static int set_segment_reg(struct task_struct *task,
98                            unsigned long offset, u16 value)
99 {
100         /*
101          * The value argument was already truncated to 16 bits.
102          */
103         if (invalid_selector(value))
104                 return -EIO;
105
106         /*
107          * For %cs and %ss we cannot permit a null selector.
108          * We can permit a bogus selector as long as it has USER_RPL.
109          * Null selectors are fine for other segment registers, but
110          * we will never get back to user mode with invalid %cs or %ss
111          * and will take the trap in iret instead.  Much code relies
112          * on user_mode() to distinguish a user trap frame (which can
113          * safely use invalid selectors) from a kernel trap frame.
114          */
115         switch (offset) {
116         case offsetof(struct user_regs_struct, cs):
117         case offsetof(struct user_regs_struct, ss):
118                 if (unlikely(value == 0))
119                         return -EIO;
120
121         default:
122                 *pt_regs_access(task_pt_regs(task), offset) = value;
123                 break;
124
125         case offsetof(struct user_regs_struct, gs):
126                 task->thread.gs = value;
127                 if (task == current)
128                         /*
129                          * The user-mode %gs is not affected by
130                          * kernel entry, so we must update the CPU.
131                          */
132                         loadsegment(gs, value);
133         }
134
135         return 0;
136 }
137
138 static unsigned long debugreg_addr_limit(struct task_struct *task)
139 {
140         return TASK_SIZE - 3;
141 }
142
143 #else  /* CONFIG_X86_64 */
144
145 #define FLAG_MASK               (FLAG_MASK_32 | X86_EFLAGS_NT)
146
147 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
148 {
149         BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
150         return &regs->r15 + (offset / sizeof(regs->r15));
151 }
152
153 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
154 {
155         /*
156          * Returning the value truncates it to 16 bits.
157          */
158         unsigned int seg;
159
160         switch (offset) {
161         case offsetof(struct user_regs_struct, fs):
162                 if (task == current) {
163                         /* Older gas can't assemble movq %?s,%r?? */
164                         asm("movl %%fs,%0" : "=r" (seg));
165                         return seg;
166                 }
167                 return task->thread.fsindex;
168         case offsetof(struct user_regs_struct, gs):
169                 if (task == current) {
170                         asm("movl %%gs,%0" : "=r" (seg));
171                         return seg;
172                 }
173                 return task->thread.gsindex;
174         case offsetof(struct user_regs_struct, ds):
175                 if (task == current) {
176                         asm("movl %%ds,%0" : "=r" (seg));
177                         return seg;
178                 }
179                 return task->thread.ds;
180         case offsetof(struct user_regs_struct, es):
181                 if (task == current) {
182                         asm("movl %%es,%0" : "=r" (seg));
183                         return seg;
184                 }
185                 return task->thread.es;
186
187         case offsetof(struct user_regs_struct, cs):
188         case offsetof(struct user_regs_struct, ss):
189                 break;
190         }
191         return *pt_regs_access(task_pt_regs(task), offset);
192 }
193
194 static int set_segment_reg(struct task_struct *task,
195                            unsigned long offset, u16 value)
196 {
197         /*
198          * The value argument was already truncated to 16 bits.
199          */
200         if (invalid_selector(value))
201                 return -EIO;
202
203         switch (offset) {
204         case offsetof(struct user_regs_struct,fs):
205                 /*
206                  * If this is setting fs as for normal 64-bit use but
207                  * setting fs_base has implicitly changed it, leave it.
208                  */
209                 if ((value == FS_TLS_SEL && task->thread.fsindex == 0 &&
210                      task->thread.fs != 0) ||
211                     (value == 0 && task->thread.fsindex == FS_TLS_SEL &&
212                      task->thread.fs == 0))
213                         break;
214                 task->thread.fsindex = value;
215                 if (task == current)
216                         loadsegment(fs, task->thread.fsindex);
217                 break;
218         case offsetof(struct user_regs_struct,gs):
219                 /*
220                  * If this is setting gs as for normal 64-bit use but
221                  * setting gs_base has implicitly changed it, leave it.
222                  */
223                 if ((value == GS_TLS_SEL && task->thread.gsindex == 0 &&
224                      task->thread.gs != 0) ||
225                     (value == 0 && task->thread.gsindex == GS_TLS_SEL &&
226                      task->thread.gs == 0))
227                         break;
228                 task->thread.gsindex = value;
229                 if (task == current)
230                         load_gs_index(task->thread.gsindex);
231                 break;
232         case offsetof(struct user_regs_struct,ds):
233                 task->thread.ds = value;
234                 if (task == current)
235                         loadsegment(ds, task->thread.ds);
236                 break;
237         case offsetof(struct user_regs_struct,es):
238                 task->thread.es = value;
239                 if (task == current)
240                         loadsegment(es, task->thread.es);
241                 break;
242
243                 /*
244                  * Can't actually change these in 64-bit mode.
245                  */
246         case offsetof(struct user_regs_struct,cs):
247                 if (unlikely(value == 0))
248                         return -EIO;
249 #ifdef CONFIG_IA32_EMULATION
250                 if (test_tsk_thread_flag(task, TIF_IA32))
251                         task_pt_regs(task)->cs = value;
252 #endif
253                 break;
254         case offsetof(struct user_regs_struct,ss):
255                 if (unlikely(value == 0))
256                         return -EIO;
257 #ifdef CONFIG_IA32_EMULATION
258                 if (test_tsk_thread_flag(task, TIF_IA32))
259                         task_pt_regs(task)->ss = value;
260 #endif
261                 break;
262         }
263
264         return 0;
265 }
266
267 static unsigned long debugreg_addr_limit(struct task_struct *task)
268 {
269 #ifdef CONFIG_IA32_EMULATION
270         if (test_tsk_thread_flag(task, TIF_IA32))
271                 return IA32_PAGE_OFFSET - 3;
272 #endif
273         return TASK_SIZE64 - 7;
274 }
275
276 #endif  /* CONFIG_X86_32 */
277
278 static unsigned long get_flags(struct task_struct *task)
279 {
280         unsigned long retval = task_pt_regs(task)->flags;
281
282         /*
283          * If the debugger set TF, hide it from the readout.
284          */
285         if (test_tsk_thread_flag(task, TIF_FORCED_TF))
286                 retval &= ~X86_EFLAGS_TF;
287
288         return retval;
289 }
290
291 static int set_flags(struct task_struct *task, unsigned long value)
292 {
293         struct pt_regs *regs = task_pt_regs(task);
294
295         /*
296          * If the user value contains TF, mark that
297          * it was not "us" (the debugger) that set it.
298          * If not, make sure it stays set if we had.
299          */
300         if (value & X86_EFLAGS_TF)
301                 clear_tsk_thread_flag(task, TIF_FORCED_TF);
302         else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
303                 value |= X86_EFLAGS_TF;
304
305         regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
306
307         return 0;
308 }
309
310 static int putreg(struct task_struct *child,
311                   unsigned long offset, unsigned long value)
312 {
313         switch (offset) {
314         case offsetof(struct user_regs_struct, cs):
315         case offsetof(struct user_regs_struct, ds):
316         case offsetof(struct user_regs_struct, es):
317         case offsetof(struct user_regs_struct, fs):
318         case offsetof(struct user_regs_struct, gs):
319         case offsetof(struct user_regs_struct, ss):
320                 return set_segment_reg(child, offset, value);
321
322         case offsetof(struct user_regs_struct, flags):
323                 return set_flags(child, value);
324
325 #ifdef CONFIG_X86_64
326         /*
327          * Orig_ax is really just a flag with small positive and
328          * negative values, so make sure to always sign-extend it
329          * from 32 bits so that it works correctly regardless of
330          * whether we come from a 32-bit environment or not.
331          */
332         case offsetof(struct user_regs_struct, orig_ax):
333                 value = (long) (s32) value;
334                 break;
335
336         case offsetof(struct user_regs_struct,fs_base):
337                 if (value >= TASK_SIZE_OF(child))
338                         return -EIO;
339                 /*
340                  * When changing the segment base, use do_arch_prctl
341                  * to set either thread.fs or thread.fsindex and the
342                  * corresponding GDT slot.
343                  */
344                 if (child->thread.fs != value)
345                         return do_arch_prctl(child, ARCH_SET_FS, value);
346                 return 0;
347         case offsetof(struct user_regs_struct,gs_base):
348                 /*
349                  * Exactly the same here as the %fs handling above.
350                  */
351                 if (value >= TASK_SIZE_OF(child))
352                         return -EIO;
353                 if (child->thread.gs != value)
354                         return do_arch_prctl(child, ARCH_SET_GS, value);
355                 return 0;
356 #endif
357         }
358
359         *pt_regs_access(task_pt_regs(child), offset) = value;
360         return 0;
361 }
362
363 static unsigned long getreg(struct task_struct *task, unsigned long offset)
364 {
365         switch (offset) {
366         case offsetof(struct user_regs_struct, cs):
367         case offsetof(struct user_regs_struct, ds):
368         case offsetof(struct user_regs_struct, es):
369         case offsetof(struct user_regs_struct, fs):
370         case offsetof(struct user_regs_struct, gs):
371         case offsetof(struct user_regs_struct, ss):
372                 return get_segment_reg(task, offset);
373
374         case offsetof(struct user_regs_struct, flags):
375                 return get_flags(task);
376
377 #ifdef CONFIG_X86_64
378         case offsetof(struct user_regs_struct, fs_base): {
379                 /*
380                  * do_arch_prctl may have used a GDT slot instead of
381                  * the MSR.  To userland, it appears the same either
382                  * way, except the %fs segment selector might not be 0.
383                  */
384                 unsigned int seg = task->thread.fsindex;
385                 if (task->thread.fs != 0)
386                         return task->thread.fs;
387                 if (task == current)
388                         asm("movl %%fs,%0" : "=r" (seg));
389                 if (seg != FS_TLS_SEL)
390                         return 0;
391                 return get_desc_base(&task->thread.tls_array[FS_TLS]);
392         }
393         case offsetof(struct user_regs_struct, gs_base): {
394                 /*
395                  * Exactly the same here as the %fs handling above.
396                  */
397                 unsigned int seg = task->thread.gsindex;
398                 if (task->thread.gs != 0)
399                         return task->thread.gs;
400                 if (task == current)
401                         asm("movl %%gs,%0" : "=r" (seg));
402                 if (seg != GS_TLS_SEL)
403                         return 0;
404                 return get_desc_base(&task->thread.tls_array[GS_TLS]);
405         }
406 #endif
407         }
408
409         return *pt_regs_access(task_pt_regs(task), offset);
410 }
411
412 static int genregs_get(struct task_struct *target,
413                        const struct user_regset *regset,
414                        unsigned int pos, unsigned int count,
415                        void *kbuf, void __user *ubuf)
416 {
417         if (kbuf) {
418                 unsigned long *k = kbuf;
419                 while (count > 0) {
420                         *k++ = getreg(target, pos);
421                         count -= sizeof(*k);
422                         pos += sizeof(*k);
423                 }
424         } else {
425                 unsigned long __user *u = ubuf;
426                 while (count > 0) {
427                         if (__put_user(getreg(target, pos), u++))
428                                 return -EFAULT;
429                         count -= sizeof(*u);
430                         pos += sizeof(*u);
431                 }
432         }
433
434         return 0;
435 }
436
437 static int genregs_set(struct task_struct *target,
438                        const struct user_regset *regset,
439                        unsigned int pos, unsigned int count,
440                        const void *kbuf, const void __user *ubuf)
441 {
442         int ret = 0;
443         if (kbuf) {
444                 const unsigned long *k = kbuf;
445                 while (count > 0 && !ret) {
446                         ret = putreg(target, pos, *k++);
447                         count -= sizeof(*k);
448                         pos += sizeof(*k);
449                 }
450         } else {
451                 const unsigned long  __user *u = ubuf;
452                 while (count > 0 && !ret) {
453                         unsigned long word;
454                         ret = __get_user(word, u++);
455                         if (ret)
456                                 break;
457                         ret = putreg(target, pos, word);
458                         count -= sizeof(*u);
459                         pos += sizeof(*u);
460                 }
461         }
462         return ret;
463 }
464
465 /*
466  * This function is trivial and will be inlined by the compiler.
467  * Having it separates the implementation details of debug
468  * registers from the interface details of ptrace.
469  */
470 static unsigned long ptrace_get_debugreg(struct task_struct *child, int n)
471 {
472         switch (n) {
473         case 0:         return child->thread.debugreg0;
474         case 1:         return child->thread.debugreg1;
475         case 2:         return child->thread.debugreg2;
476         case 3:         return child->thread.debugreg3;
477         case 6:         return child->thread.debugreg6;
478         case 7:         return child->thread.debugreg7;
479         }
480         return 0;
481 }
482
483 static int ptrace_set_debugreg(struct task_struct *child,
484                                int n, unsigned long data)
485 {
486         int i;
487
488         if (unlikely(n == 4 || n == 5))
489                 return -EIO;
490
491         if (n < 4 && unlikely(data >= debugreg_addr_limit(child)))
492                 return -EIO;
493
494         switch (n) {
495         case 0:         child->thread.debugreg0 = data; break;
496         case 1:         child->thread.debugreg1 = data; break;
497         case 2:         child->thread.debugreg2 = data; break;
498         case 3:         child->thread.debugreg3 = data; break;
499
500         case 6:
501                 if ((data & ~0xffffffffUL) != 0)
502                         return -EIO;
503                 child->thread.debugreg6 = data;
504                 break;
505
506         case 7:
507                 /*
508                  * Sanity-check data. Take one half-byte at once with
509                  * check = (val >> (16 + 4*i)) & 0xf. It contains the
510                  * R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits
511                  * 2 and 3 are LENi. Given a list of invalid values,
512                  * we do mask |= 1 << invalid_value, so that
513                  * (mask >> check) & 1 is a correct test for invalid
514                  * values.
515                  *
516                  * R/Wi contains the type of the breakpoint /
517                  * watchpoint, LENi contains the length of the watched
518                  * data in the watchpoint case.
519                  *
520                  * The invalid values are:
521                  * - LENi == 0x10 (undefined), so mask |= 0x0f00.       [32-bit]
522                  * - R/Wi == 0x10 (break on I/O reads or writes), so
523                  *   mask |= 0x4444.
524                  * - R/Wi == 0x00 && LENi != 0x00, so we have mask |=
525                  *   0x1110.
526                  *
527                  * Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54.
528                  *
529                  * See the Intel Manual "System Programming Guide",
530                  * 15.2.4
531                  *
532                  * Note that LENi == 0x10 is defined on x86_64 in long
533                  * mode (i.e. even for 32-bit userspace software, but
534                  * 64-bit kernel), so the x86_64 mask value is 0x5454.
535                  * See the AMD manual no. 24593 (AMD64 System Programming)
536                  */
537 #ifdef CONFIG_X86_32
538 #define DR7_MASK        0x5f54
539 #else
540 #define DR7_MASK        0x5554
541 #endif
542                 data &= ~DR_CONTROL_RESERVED;
543                 for (i = 0; i < 4; i++)
544                         if ((DR7_MASK >> ((data >> (16 + 4*i)) & 0xf)) & 1)
545                                 return -EIO;
546                 child->thread.debugreg7 = data;
547                 if (data)
548                         set_tsk_thread_flag(child, TIF_DEBUG);
549                 else
550                         clear_tsk_thread_flag(child, TIF_DEBUG);
551                 break;
552         }
553
554         return 0;
555 }
556
557 #ifdef X86_BTS
558
559 static int ptrace_bts_get_size(struct task_struct *child)
560 {
561         if (!child->thread.ds_area_msr)
562                 return -ENXIO;
563
564         return ds_get_bts_index((void *)child->thread.ds_area_msr);
565 }
566
567 static int ptrace_bts_read_record(struct task_struct *child,
568                                   long index,
569                                   struct bts_struct __user *out)
570 {
571         struct bts_struct ret;
572         int retval;
573         int bts_end;
574         int bts_index;
575
576         if (!child->thread.ds_area_msr)
577                 return -ENXIO;
578
579         if (index < 0)
580                 return -EINVAL;
581
582         bts_end = ds_get_bts_end((void *)child->thread.ds_area_msr);
583         if (bts_end <= index)
584                 return -EINVAL;
585
586         /* translate the ptrace bts index into the ds bts index */
587         bts_index = ds_get_bts_index((void *)child->thread.ds_area_msr);
588         bts_index -= (index + 1);
589         if (bts_index < 0)
590                 bts_index += bts_end;
591
592         retval = ds_read_bts((void *)child->thread.ds_area_msr,
593                              bts_index, &ret);
594         if (retval < 0)
595                 return retval;
596
597         if (copy_to_user(out, &ret, sizeof(ret)))
598                 return -EFAULT;
599
600         return sizeof(ret);
601 }
602
603 static int ptrace_bts_clear(struct task_struct *child)
604 {
605         if (!child->thread.ds_area_msr)
606                 return -ENXIO;
607
608         return ds_clear((void *)child->thread.ds_area_msr);
609 }
610
611 static int ptrace_bts_drain(struct task_struct *child,
612                             long size,
613                             struct bts_struct __user *out)
614 {
615         int end, i;
616         void *ds = (void *)child->thread.ds_area_msr;
617
618         if (!ds)
619                 return -ENXIO;
620
621         end = ds_get_bts_index(ds);
622         if (end <= 0)
623                 return end;
624
625         if (size < (end * sizeof(struct bts_struct)))
626                 return -EIO;
627
628         for (i = 0; i < end; i++, out++) {
629                 struct bts_struct ret;
630                 int retval;
631
632                 retval = ds_read_bts(ds, i, &ret);
633                 if (retval < 0)
634                         return retval;
635
636                 if (copy_to_user(out, &ret, sizeof(ret)))
637                         return -EFAULT;
638         }
639
640         ds_clear(ds);
641
642         return end;
643 }
644
645 static int ptrace_bts_config(struct task_struct *child,
646                              long cfg_size,
647                              const struct ptrace_bts_config __user *ucfg)
648 {
649         struct ptrace_bts_config cfg;
650         int bts_size, ret = 0;
651         void *ds;
652
653         if (cfg_size < sizeof(cfg))
654                 return -EIO;
655
656         if (copy_from_user(&cfg, ucfg, sizeof(cfg)))
657                 return -EFAULT;
658
659         if ((int)cfg.size < 0)
660                 return -EINVAL;
661
662         bts_size = 0;
663         ds = (void *)child->thread.ds_area_msr;
664         if (ds) {
665                 bts_size = ds_get_bts_size(ds);
666                 if (bts_size < 0)
667                         return bts_size;
668         }
669         cfg.size = PAGE_ALIGN(cfg.size);
670
671         if (bts_size != cfg.size) {
672                 ret = ptrace_bts_realloc(child, cfg.size,
673                                          cfg.flags & PTRACE_BTS_O_CUT_SIZE);
674                 if (ret < 0)
675                         goto errout;
676
677                 ds = (void *)child->thread.ds_area_msr;
678         }
679
680         if (cfg.flags & PTRACE_BTS_O_SIGNAL)
681                 ret = ds_set_overflow(ds, DS_O_SIGNAL);
682         else
683                 ret = ds_set_overflow(ds, DS_O_WRAP);
684         if (ret < 0)
685                 goto errout;
686
687         if (cfg.flags & PTRACE_BTS_O_TRACE)
688                 child->thread.debugctlmsr |= ds_debugctl_mask();
689         else
690                 child->thread.debugctlmsr &= ~ds_debugctl_mask();
691
692         if (cfg.flags & PTRACE_BTS_O_SCHED)
693                 set_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
694         else
695                 clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
696
697         ret = sizeof(cfg);
698
699 out:
700         if (child->thread.debugctlmsr)
701                 set_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
702         else
703                 clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
704
705         return ret;
706
707 errout:
708         child->thread.debugctlmsr &= ~ds_debugctl_mask();
709         clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
710         goto out;
711 }
712
713 static int ptrace_bts_status(struct task_struct *child,
714                              long cfg_size,
715                              struct ptrace_bts_config __user *ucfg)
716 {
717         void *ds = (void *)child->thread.ds_area_msr;
718         struct ptrace_bts_config cfg;
719
720         if (cfg_size < sizeof(cfg))
721                 return -EIO;
722
723         memset(&cfg, 0, sizeof(cfg));
724
725         if (ds) {
726                 cfg.size = ds_get_bts_size(ds);
727
728                 if (ds_get_overflow(ds) == DS_O_SIGNAL)
729                         cfg.flags |= PTRACE_BTS_O_SIGNAL;
730
731                 if (test_tsk_thread_flag(child, TIF_DEBUGCTLMSR) &&
732                     child->thread.debugctlmsr & ds_debugctl_mask())
733                         cfg.flags |= PTRACE_BTS_O_TRACE;
734
735                 if (test_tsk_thread_flag(child, TIF_BTS_TRACE_TS))
736                         cfg.flags |= PTRACE_BTS_O_SCHED;
737         }
738
739         cfg.bts_size = sizeof(struct bts_struct);
740
741         if (copy_to_user(ucfg, &cfg, sizeof(cfg)))
742                 return -EFAULT;
743
744         return sizeof(cfg);
745 }
746
747
748 static int ptrace_bts_write_record(struct task_struct *child,
749                                    const struct bts_struct *in)
750 {
751         int retval;
752
753         if (!child->thread.ds_area_msr)
754                 return -ENXIO;
755
756         retval = ds_write_bts((void *)child->thread.ds_area_msr, in);
757         if (retval)
758                 return retval;
759
760         return sizeof(*in);
761 }
762
763 static int ptrace_bts_realloc(struct task_struct *child,
764                               int size, int reduce_size)
765 {
766         unsigned long rlim, vm;
767         int ret, old_size;
768
769         if (size < 0)
770                 return -EINVAL;
771
772         old_size = ds_get_bts_size((void *)child->thread.ds_area_msr);
773         if (old_size < 0)
774                 return old_size;
775
776         ret = ds_free((void **)&child->thread.ds_area_msr);
777         if (ret < 0)
778                 goto out;
779
780         size >>= PAGE_SHIFT;
781         old_size >>= PAGE_SHIFT;
782
783         current->mm->total_vm  -= old_size;
784         current->mm->locked_vm -= old_size;
785
786         if (size == 0)
787                 goto out;
788
789         rlim = current->signal->rlim[RLIMIT_AS].rlim_cur >> PAGE_SHIFT;
790         vm = current->mm->total_vm  + size;
791         if (rlim < vm) {
792                 ret = -ENOMEM;
793
794                 if (!reduce_size)
795                         goto out;
796
797                 size = rlim - current->mm->total_vm;
798                 if (size <= 0)
799                         goto out;
800         }
801
802         rlim = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur >> PAGE_SHIFT;
803         vm = current->mm->locked_vm  + size;
804         if (rlim < vm) {
805                 ret = -ENOMEM;
806
807                 if (!reduce_size)
808                         goto out;
809
810                 size = rlim - current->mm->locked_vm;
811                 if (size <= 0)
812                         goto out;
813         }
814
815         ret = ds_allocate((void **)&child->thread.ds_area_msr,
816                           size << PAGE_SHIFT);
817         if (ret < 0)
818                 goto out;
819
820         current->mm->total_vm  += size;
821         current->mm->locked_vm += size;
822
823 out:
824         if (child->thread.ds_area_msr)
825                 set_tsk_thread_flag(child, TIF_DS_AREA_MSR);
826         else
827                 clear_tsk_thread_flag(child, TIF_DS_AREA_MSR);
828
829         return ret;
830 }
831
832 void ptrace_bts_take_timestamp(struct task_struct *tsk,
833                                enum bts_qualifier qualifier)
834 {
835         struct bts_struct rec = {
836                 .qualifier = qualifier,
837                 .variant.jiffies = jiffies_64
838         };
839
840         ptrace_bts_write_record(tsk, &rec);
841 }
842 #endif /* X86_BTS */
843
844 /*
845  * Called by kernel/ptrace.c when detaching..
846  *
847  * Make sure the single step bit is not set.
848  */
849 void ptrace_disable(struct task_struct *child)
850 {
851         user_disable_single_step(child);
852 #ifdef TIF_SYSCALL_EMU
853         clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
854 #endif
855         if (child->thread.ds_area_msr) {
856 #ifdef X86_BTS
857                 ptrace_bts_realloc(child, 0, 0);
858 #endif
859                 child->thread.debugctlmsr &= ~ds_debugctl_mask();
860                 if (!child->thread.debugctlmsr)
861                         clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
862                 clear_tsk_thread_flag(child, TIF_BTS_TRACE_TS);
863         }
864 }
865
866 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
867 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
868 #endif
869
870 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
871 {
872         int ret;
873         unsigned long __user *datap = (unsigned long __user *)data;
874
875         switch (request) {
876         /* read the word at location addr in the USER area. */
877         case PTRACE_PEEKUSR: {
878                 unsigned long tmp;
879
880                 ret = -EIO;
881                 if ((addr & (sizeof(data) - 1)) || addr < 0 ||
882                     addr >= sizeof(struct user))
883                         break;
884
885                 tmp = 0;  /* Default return condition */
886                 if (addr < sizeof(struct user_regs_struct))
887                         tmp = getreg(child, addr);
888                 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
889                          addr <= offsetof(struct user, u_debugreg[7])) {
890                         addr -= offsetof(struct user, u_debugreg[0]);
891                         tmp = ptrace_get_debugreg(child, addr / sizeof(data));
892                 }
893                 ret = put_user(tmp, datap);
894                 break;
895         }
896
897         case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
898                 ret = -EIO;
899                 if ((addr & (sizeof(data) - 1)) || addr < 0 ||
900                     addr >= sizeof(struct user))
901                         break;
902
903                 if (addr < sizeof(struct user_regs_struct))
904                         ret = putreg(child, addr, data);
905                 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
906                          addr <= offsetof(struct user, u_debugreg[7])) {
907                         addr -= offsetof(struct user, u_debugreg[0]);
908                         ret = ptrace_set_debugreg(child,
909                                                   addr / sizeof(data), data);
910                 }
911                 break;
912
913         case PTRACE_GETREGS:    /* Get all gp regs from the child. */
914                 return copy_regset_to_user(child,
915                                            task_user_regset_view(current),
916                                            REGSET_GENERAL,
917                                            0, sizeof(struct user_regs_struct),
918                                            datap);
919
920         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
921                 return copy_regset_from_user(child,
922                                              task_user_regset_view(current),
923                                              REGSET_GENERAL,
924                                              0, sizeof(struct user_regs_struct),
925                                              datap);
926
927         case PTRACE_GETFPREGS:  /* Get the child FPU state. */
928                 return copy_regset_to_user(child,
929                                            task_user_regset_view(current),
930                                            REGSET_FP,
931                                            0, sizeof(struct user_i387_struct),
932                                            datap);
933
934         case PTRACE_SETFPREGS:  /* Set the child FPU state. */
935                 return copy_regset_from_user(child,
936                                              task_user_regset_view(current),
937                                              REGSET_FP,
938                                              0, sizeof(struct user_i387_struct),
939                                              datap);
940
941 #ifdef CONFIG_X86_32
942         case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
943                 return copy_regset_to_user(child, &user_x86_32_view,
944                                            REGSET_XFP,
945                                            0, sizeof(struct user_fxsr_struct),
946                                            datap);
947
948         case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
949                 return copy_regset_from_user(child, &user_x86_32_view,
950                                              REGSET_XFP,
951                                              0, sizeof(struct user_fxsr_struct),
952                                              datap);
953 #endif
954
955 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
956         case PTRACE_GET_THREAD_AREA:
957                 if (addr < 0)
958                         return -EIO;
959                 ret = do_get_thread_area(child, addr,
960                                          (struct user_desc __user *) data);
961                 break;
962
963         case PTRACE_SET_THREAD_AREA:
964                 if (addr < 0)
965                         return -EIO;
966                 ret = do_set_thread_area(child, addr,
967                                          (struct user_desc __user *) data, 0);
968                 break;
969 #endif
970
971 #ifdef CONFIG_X86_64
972                 /* normal 64bit interface to access TLS data.
973                    Works just like arch_prctl, except that the arguments
974                    are reversed. */
975         case PTRACE_ARCH_PRCTL:
976                 ret = do_arch_prctl(child, data, addr);
977                 break;
978 #endif
979
980         /*
981          * These bits need more cooking - not enabled yet:
982          */
983 #ifdef X86_BTS
984         case PTRACE_BTS_CONFIG:
985                 ret = ptrace_bts_config
986                         (child, data, (struct ptrace_bts_config __user *)addr);
987                 break;
988
989         case PTRACE_BTS_STATUS:
990                 ret = ptrace_bts_status
991                         (child, data, (struct ptrace_bts_config __user *)addr);
992                 break;
993
994         case PTRACE_BTS_SIZE:
995                 ret = ptrace_bts_get_size(child);
996                 break;
997
998         case PTRACE_BTS_GET:
999                 ret = ptrace_bts_read_record
1000                         (child, data, (struct bts_struct __user *) addr);
1001                 break;
1002
1003         case PTRACE_BTS_CLEAR:
1004                 ret = ptrace_bts_clear(child);
1005                 break;
1006
1007         case PTRACE_BTS_DRAIN:
1008                 ret = ptrace_bts_drain
1009                         (child, data, (struct bts_struct __user *) addr);
1010                 break;
1011 #endif
1012
1013         default:
1014                 ret = ptrace_request(child, request, addr, data);
1015                 break;
1016         }
1017
1018         return ret;
1019 }
1020
1021 #ifdef CONFIG_IA32_EMULATION
1022
1023 #include <linux/compat.h>
1024 #include <linux/syscalls.h>
1025 #include <asm/ia32.h>
1026 #include <asm/user32.h>
1027
1028 #define R32(l,q)                                                        \
1029         case offsetof(struct user32, regs.l):                           \
1030                 regs->q = value; break
1031
1032 #define SEG32(rs)                                                       \
1033         case offsetof(struct user32, regs.rs):                          \
1034                 return set_segment_reg(child,                           \
1035                                        offsetof(struct user_regs_struct, rs), \
1036                                        value);                          \
1037                 break
1038
1039 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
1040 {
1041         struct pt_regs *regs = task_pt_regs(child);
1042
1043         switch (regno) {
1044
1045         SEG32(cs);
1046         SEG32(ds);
1047         SEG32(es);
1048         SEG32(fs);
1049         SEG32(gs);
1050         SEG32(ss);
1051
1052         R32(ebx, bx);
1053         R32(ecx, cx);
1054         R32(edx, dx);
1055         R32(edi, di);
1056         R32(esi, si);
1057         R32(ebp, bp);
1058         R32(eax, ax);
1059         R32(eip, ip);
1060         R32(esp, sp);
1061
1062         case offsetof(struct user32, regs.orig_eax):
1063                 /*
1064                  * Sign-extend the value so that orig_eax = -1
1065                  * causes (long)orig_ax < 0 tests to fire correctly.
1066                  */
1067                 regs->orig_ax = (long) (s32) value;
1068                 break;
1069
1070         case offsetof(struct user32, regs.eflags):
1071                 return set_flags(child, value);
1072
1073         case offsetof(struct user32, u_debugreg[0]) ...
1074                 offsetof(struct user32, u_debugreg[7]):
1075                 regno -= offsetof(struct user32, u_debugreg[0]);
1076                 return ptrace_set_debugreg(child, regno / 4, value);
1077
1078         default:
1079                 if (regno > sizeof(struct user32) || (regno & 3))
1080                         return -EIO;
1081
1082                 /*
1083                  * Other dummy fields in the virtual user structure
1084                  * are ignored
1085                  */
1086                 break;
1087         }
1088         return 0;
1089 }
1090
1091 #undef R32
1092 #undef SEG32
1093
1094 #define R32(l,q)                                                        \
1095         case offsetof(struct user32, regs.l):                           \
1096                 *val = regs->q; break
1097
1098 #define SEG32(rs)                                                       \
1099         case offsetof(struct user32, regs.rs):                          \
1100                 *val = get_segment_reg(child,                           \
1101                                        offsetof(struct user_regs_struct, rs)); \
1102                 break
1103
1104 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
1105 {
1106         struct pt_regs *regs = task_pt_regs(child);
1107
1108         switch (regno) {
1109
1110         SEG32(ds);
1111         SEG32(es);
1112         SEG32(fs);
1113         SEG32(gs);
1114
1115         R32(cs, cs);
1116         R32(ss, ss);
1117         R32(ebx, bx);
1118         R32(ecx, cx);
1119         R32(edx, dx);
1120         R32(edi, di);
1121         R32(esi, si);
1122         R32(ebp, bp);
1123         R32(eax, ax);
1124         R32(orig_eax, orig_ax);
1125         R32(eip, ip);
1126         R32(esp, sp);
1127
1128         case offsetof(struct user32, regs.eflags):
1129                 *val = get_flags(child);
1130                 break;
1131
1132         case offsetof(struct user32, u_debugreg[0]) ...
1133                 offsetof(struct user32, u_debugreg[7]):
1134                 regno -= offsetof(struct user32, u_debugreg[0]);
1135                 *val = ptrace_get_debugreg(child, regno / 4);
1136                 break;
1137
1138         default:
1139                 if (regno > sizeof(struct user32) || (regno & 3))
1140                         return -EIO;
1141
1142                 /*
1143                  * Other dummy fields in the virtual user structure
1144                  * are ignored
1145                  */
1146                 *val = 0;
1147                 break;
1148         }
1149         return 0;
1150 }
1151
1152 #undef R32
1153 #undef SEG32
1154
1155 static int genregs32_get(struct task_struct *target,
1156                          const struct user_regset *regset,
1157                          unsigned int pos, unsigned int count,
1158                          void *kbuf, void __user *ubuf)
1159 {
1160         if (kbuf) {
1161                 compat_ulong_t *k = kbuf;
1162                 while (count > 0) {
1163                         getreg32(target, pos, k++);
1164                         count -= sizeof(*k);
1165                         pos += sizeof(*k);
1166                 }
1167         } else {
1168                 compat_ulong_t __user *u = ubuf;
1169                 while (count > 0) {
1170                         compat_ulong_t word;
1171                         getreg32(target, pos, &word);
1172                         if (__put_user(word, u++))
1173                                 return -EFAULT;
1174                         count -= sizeof(*u);
1175                         pos += sizeof(*u);
1176                 }
1177         }
1178
1179         return 0;
1180 }
1181
1182 static int genregs32_set(struct task_struct *target,
1183                          const struct user_regset *regset,
1184                          unsigned int pos, unsigned int count,
1185                          const void *kbuf, const void __user *ubuf)
1186 {
1187         int ret = 0;
1188         if (kbuf) {
1189                 const compat_ulong_t *k = kbuf;
1190                 while (count > 0 && !ret) {
1191                         ret = putreg32(target, pos, *k++);
1192                         count -= sizeof(*k);
1193                         pos += sizeof(*k);
1194                 }
1195         } else {
1196                 const compat_ulong_t __user *u = ubuf;
1197                 while (count > 0 && !ret) {
1198                         compat_ulong_t word;
1199                         ret = __get_user(word, u++);
1200                         if (ret)
1201                                 break;
1202                         ret = putreg32(target, pos, word);
1203                         count -= sizeof(*u);
1204                         pos += sizeof(*u);
1205                 }
1206         }
1207         return ret;
1208 }
1209
1210 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1211                         compat_ulong_t caddr, compat_ulong_t cdata)
1212 {
1213         unsigned long addr = caddr;
1214         unsigned long data = cdata;
1215         void __user *datap = compat_ptr(data);
1216         int ret;
1217         __u32 val;
1218
1219         switch (request) {
1220         case PTRACE_PEEKUSR:
1221                 ret = getreg32(child, addr, &val);
1222                 if (ret == 0)
1223                         ret = put_user(val, (__u32 __user *)datap);
1224                 break;
1225
1226         case PTRACE_POKEUSR:
1227                 ret = putreg32(child, addr, data);
1228                 break;
1229
1230         case PTRACE_GETREGS:    /* Get all gp regs from the child. */
1231                 return copy_regset_to_user(child, &user_x86_32_view,
1232                                            REGSET_GENERAL,
1233                                            0, sizeof(struct user_regs_struct32),
1234                                            datap);
1235
1236         case PTRACE_SETREGS:    /* Set all gp regs in the child. */
1237                 return copy_regset_from_user(child, &user_x86_32_view,
1238                                              REGSET_GENERAL, 0,
1239                                              sizeof(struct user_regs_struct32),
1240                                              datap);
1241
1242         case PTRACE_GETFPREGS:  /* Get the child FPU state. */
1243                 return copy_regset_to_user(child, &user_x86_32_view,
1244                                            REGSET_FP, 0,
1245                                            sizeof(struct user_i387_ia32_struct),
1246                                            datap);
1247
1248         case PTRACE_SETFPREGS:  /* Set the child FPU state. */
1249                 return copy_regset_from_user(
1250                         child, &user_x86_32_view, REGSET_FP,
1251                         0, sizeof(struct user_i387_ia32_struct), datap);
1252
1253         case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1254                 return copy_regset_to_user(child, &user_x86_32_view,
1255                                            REGSET_XFP, 0,
1256                                            sizeof(struct user32_fxsr_struct),
1257                                            datap);
1258
1259         case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1260                 return copy_regset_from_user(child, &user_x86_32_view,
1261                                              REGSET_XFP, 0,
1262                                              sizeof(struct user32_fxsr_struct),
1263                                              datap);
1264
1265         case PTRACE_GET_THREAD_AREA:
1266         case PTRACE_SET_THREAD_AREA:
1267                 return arch_ptrace(child, request, addr, data);
1268
1269         default:
1270                 return compat_ptrace_request(child, request, addr, data);
1271         }
1272
1273         return ret;
1274 }
1275
1276 #endif  /* CONFIG_IA32_EMULATION */
1277
1278 #ifdef CONFIG_X86_64
1279
1280 static const struct user_regset x86_64_regsets[] = {
1281         [REGSET_GENERAL] = {
1282                 .core_note_type = NT_PRSTATUS,
1283                 .n = sizeof(struct user_regs_struct) / sizeof(long),
1284                 .size = sizeof(long), .align = sizeof(long),
1285                 .get = genregs_get, .set = genregs_set
1286         },
1287         [REGSET_FP] = {
1288                 .core_note_type = NT_PRFPREG,
1289                 .n = sizeof(struct user_i387_struct) / sizeof(long),
1290                 .size = sizeof(long), .align = sizeof(long),
1291                 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
1292         },
1293 };
1294
1295 static const struct user_regset_view user_x86_64_view = {
1296         .name = "x86_64", .e_machine = EM_X86_64,
1297         .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1298 };
1299
1300 #else  /* CONFIG_X86_32 */
1301
1302 #define user_regs_struct32      user_regs_struct
1303 #define genregs32_get           genregs_get
1304 #define genregs32_set           genregs_set
1305
1306 #endif  /* CONFIG_X86_64 */
1307
1308 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1309 static const struct user_regset x86_32_regsets[] = {
1310         [REGSET_GENERAL] = {
1311                 .core_note_type = NT_PRSTATUS,
1312                 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1313                 .size = sizeof(u32), .align = sizeof(u32),
1314                 .get = genregs32_get, .set = genregs32_set
1315         },
1316         [REGSET_FP] = {
1317                 .core_note_type = NT_PRFPREG,
1318                 .n = sizeof(struct user_i387_struct) / sizeof(u32),
1319                 .size = sizeof(u32), .align = sizeof(u32),
1320                 .active = fpregs_active, .get = fpregs_get, .set = fpregs_set
1321         },
1322         [REGSET_XFP] = {
1323                 .core_note_type = NT_PRXFPREG,
1324                 .n = sizeof(struct user_i387_struct) / sizeof(u32),
1325                 .size = sizeof(u32), .align = sizeof(u32),
1326                 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
1327         },
1328         [REGSET_TLS] = {
1329                 .core_note_type = NT_386_TLS,
1330                 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1331                 .size = sizeof(struct user_desc),
1332                 .align = sizeof(struct user_desc),
1333                 .active = regset_tls_active,
1334                 .get = regset_tls_get, .set = regset_tls_set
1335         },
1336 };
1337
1338 static const struct user_regset_view user_x86_32_view = {
1339         .name = "i386", .e_machine = EM_386,
1340         .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1341 };
1342 #endif
1343
1344 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1345 {
1346 #ifdef CONFIG_IA32_EMULATION
1347         if (test_tsk_thread_flag(task, TIF_IA32))
1348 #endif
1349 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1350                 return &user_x86_32_view;
1351 #endif
1352 #ifdef CONFIG_X86_64
1353         return &user_x86_64_view;
1354 #endif
1355 }
1356
1357 #ifdef CONFIG_X86_32
1358
1359 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
1360 {
1361         struct siginfo info;
1362
1363         tsk->thread.trap_no = 1;
1364         tsk->thread.error_code = error_code;
1365
1366         memset(&info, 0, sizeof(info));
1367         info.si_signo = SIGTRAP;
1368         info.si_code = TRAP_BRKPT;
1369
1370         /* User-mode ip? */
1371         info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL;
1372
1373         /* Send us the fake SIGTRAP */
1374         force_sig_info(SIGTRAP, &info, tsk);
1375 }
1376
1377 /* notification of system call entry/exit
1378  * - triggered by current->work.syscall_trace
1379  */
1380 int do_syscall_trace(struct pt_regs *regs, int entryexit)
1381 {
1382         int is_sysemu = test_thread_flag(TIF_SYSCALL_EMU);
1383         /*
1384          * With TIF_SYSCALL_EMU set we want to ignore TIF_SINGLESTEP for syscall
1385          * interception
1386          */
1387         int is_singlestep = !is_sysemu && test_thread_flag(TIF_SINGLESTEP);
1388         int ret = 0;
1389
1390         /* do the secure computing check first */
1391         if (!entryexit)
1392                 secure_computing(regs->orig_ax);
1393
1394         if (unlikely(current->audit_context)) {
1395                 if (entryexit)
1396                         audit_syscall_exit(AUDITSC_RESULT(regs->ax),
1397                                                 regs->ax);
1398                 /* Debug traps, when using PTRACE_SINGLESTEP, must be sent only
1399                  * on the syscall exit path. Normally, when TIF_SYSCALL_AUDIT is
1400                  * not used, entry.S will call us only on syscall exit, not
1401                  * entry; so when TIF_SYSCALL_AUDIT is used we must avoid
1402                  * calling send_sigtrap() on syscall entry.
1403                  *
1404                  * Note that when PTRACE_SYSEMU_SINGLESTEP is used,
1405                  * is_singlestep is false, despite his name, so we will still do
1406                  * the correct thing.
1407                  */
1408                 else if (is_singlestep)
1409                         goto out;
1410         }
1411
1412         if (!(current->ptrace & PT_PTRACED))
1413                 goto out;
1414
1415         /* If a process stops on the 1st tracepoint with SYSCALL_TRACE
1416          * and then is resumed with SYSEMU_SINGLESTEP, it will come in
1417          * here. We have to check this and return */
1418         if (is_sysemu && entryexit)
1419                 return 0;
1420
1421         /* Fake a debug trap */
1422         if (is_singlestep)
1423                 send_sigtrap(current, regs, 0);
1424
1425         if (!test_thread_flag(TIF_SYSCALL_TRACE) && !is_sysemu)
1426                 goto out;
1427
1428         /* the 0x80 provides a way for the tracing parent to distinguish
1429            between a syscall stop and SIGTRAP delivery */
1430         /* Note that the debugger could change the result of test_thread_flag!*/
1431         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ? 0x80:0));
1432
1433         /*
1434          * this isn't the same as continuing with a signal, but it will do
1435          * for normal use.  strace only continues with a signal if the
1436          * stopping signal is not SIGTRAP.  -brl
1437          */
1438         if (current->exit_code) {
1439                 send_sig(current->exit_code, current, 1);
1440                 current->exit_code = 0;
1441         }
1442         ret = is_sysemu;
1443 out:
1444         if (unlikely(current->audit_context) && !entryexit)
1445                 audit_syscall_entry(AUDIT_ARCH_I386, regs->orig_ax,
1446                                     regs->bx, regs->cx, regs->dx, regs->si);
1447         if (ret == 0)
1448                 return 0;
1449
1450         regs->orig_ax = -1; /* force skip of syscall restarting */
1451         if (unlikely(current->audit_context))
1452                 audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
1453         return 1;
1454 }
1455
1456 #else  /* CONFIG_X86_64 */
1457
1458 static void syscall_trace(struct pt_regs *regs)
1459 {
1460
1461 #if 0
1462         printk("trace %s ip %lx sp %lx ax %d origrax %d caller %lx tiflags %x ptrace %x\n",
1463                current->comm,
1464                regs->ip, regs->sp, regs->ax, regs->orig_ax, __builtin_return_address(0),
1465                current_thread_info()->flags, current->ptrace);
1466 #endif
1467
1468         ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
1469                                 ? 0x80 : 0));
1470         /*
1471          * this isn't the same as continuing with a signal, but it will do
1472          * for normal use.  strace only continues with a signal if the
1473          * stopping signal is not SIGTRAP.  -brl
1474          */
1475         if (current->exit_code) {
1476                 send_sig(current->exit_code, current, 1);
1477                 current->exit_code = 0;
1478         }
1479 }
1480
1481 asmlinkage void syscall_trace_enter(struct pt_regs *regs)
1482 {
1483         /* do the secure computing check first */
1484         secure_computing(regs->orig_ax);
1485
1486         if (test_thread_flag(TIF_SYSCALL_TRACE)
1487             && (current->ptrace & PT_PTRACED))
1488                 syscall_trace(regs);
1489
1490         if (unlikely(current->audit_context)) {
1491                 if (test_thread_flag(TIF_IA32)) {
1492                         audit_syscall_entry(AUDIT_ARCH_I386,
1493                                             regs->orig_ax,
1494                                             regs->bx, regs->cx,
1495                                             regs->dx, regs->si);
1496                 } else {
1497                         audit_syscall_entry(AUDIT_ARCH_X86_64,
1498                                             regs->orig_ax,
1499                                             regs->di, regs->si,
1500                                             regs->dx, regs->r10);
1501                 }
1502         }
1503 }
1504
1505 asmlinkage void syscall_trace_leave(struct pt_regs *regs)
1506 {
1507         if (unlikely(current->audit_context))
1508                 audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
1509
1510         if ((test_thread_flag(TIF_SYSCALL_TRACE)
1511              || test_thread_flag(TIF_SINGLESTEP))
1512             && (current->ptrace & PT_PTRACED))
1513                 syscall_trace(regs);
1514 }
1515
1516 #endif  /* CONFIG_X86_32 */