1 // SPDX-License-Identifier: GPL-2.0-only
2 /* By Ross Biro 1/23/92 */
3 /*
4 * Pentium III FXSR, SSE support
5 * Gareth Hughes <gareth@valinux.com>, May 2000
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/sched.h>
10 #include <linux/sched/task_stack.h>
11 #include <linux/mm.h>
12 #include <linux/smp.h>
13 #include <linux/errno.h>
14 #include <linux/slab.h>
15 #include <linux/ptrace.h>
16 #include <linux/tracehook.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 #include <linux/perf_event.h>
24 #include <linux/hw_breakpoint.h>
25 #include <linux/rcupdate.h>
26 #include <linux/export.h>
27 #include <linux/context_tracking.h>
28 #include <linux/nospec.h>
29
30 #include <linux/uaccess.h>
31 #include <asm/processor.h>
32 #include <asm/fpu/internal.h>
33 #include <asm/fpu/signal.h>
34 #include <asm/fpu/regset.h>
35 #include <asm/debugreg.h>
36 #include <asm/ldt.h>
37 #include <asm/desc.h>
38 #include <asm/prctl.h>
39 #include <asm/proto.h>
40 #include <asm/hw_breakpoint.h>
41 #include <asm/traps.h>
42 #include <asm/syscall.h>
43 #include <asm/fsgsbase.h>
44 #include <asm/io_bitmap.h>
45
46 #include "tls.h"
47
48 enum x86_regset {
49 REGSET_GENERAL,
50 REGSET_FP,
51 REGSET_XFP,
52 REGSET_IOPERM64 = REGSET_XFP,
53 REGSET_XSTATE,
54 REGSET_TLS,
55 REGSET_IOPERM32,
56 };
57
58 struct pt_regs_offset {
59 const char *name;
60 int offset;
61 };
62
63 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
64 #define REG_OFFSET_END {.name = NULL, .offset = 0}
65
66 static const struct pt_regs_offset regoffset_table[] = {
67 #ifdef CONFIG_X86_64
68 REG_OFFSET_NAME(r15),
69 REG_OFFSET_NAME(r14),
70 REG_OFFSET_NAME(r13),
71 REG_OFFSET_NAME(r12),
72 REG_OFFSET_NAME(r11),
73 REG_OFFSET_NAME(r10),
74 REG_OFFSET_NAME(r9),
75 REG_OFFSET_NAME(r8),
76 #endif
77 REG_OFFSET_NAME(bx),
78 REG_OFFSET_NAME(cx),
79 REG_OFFSET_NAME(dx),
80 REG_OFFSET_NAME(si),
81 REG_OFFSET_NAME(di),
82 REG_OFFSET_NAME(bp),
83 REG_OFFSET_NAME(ax),
84 #ifdef CONFIG_X86_32
85 REG_OFFSET_NAME(ds),
86 REG_OFFSET_NAME(es),
87 REG_OFFSET_NAME(fs),
88 REG_OFFSET_NAME(gs),
89 #endif
90 REG_OFFSET_NAME(orig_ax),
91 REG_OFFSET_NAME(ip),
92 REG_OFFSET_NAME(cs),
93 REG_OFFSET_NAME(flags),
94 REG_OFFSET_NAME(sp),
95 REG_OFFSET_NAME(ss),
96 REG_OFFSET_END,
97 };
98
99 /**
100 * regs_query_register_offset() - query register offset from its name
101 * @name: the name of a register
102 *
103 * regs_query_register_offset() returns the offset of a register in struct
104 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
105 */
regs_query_register_offset(const char * name)106 int regs_query_register_offset(const char *name)
107 {
108 const struct pt_regs_offset *roff;
109 for (roff = regoffset_table; roff->name != NULL; roff++)
110 if (!strcmp(roff->name, name))
111 return roff->offset;
112 return -EINVAL;
113 }
114
115 /**
116 * regs_query_register_name() - query register name from its offset
117 * @offset: the offset of a register in struct pt_regs.
118 *
119 * regs_query_register_name() returns the name of a register from its
120 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
121 */
regs_query_register_name(unsigned int offset)122 const char *regs_query_register_name(unsigned int offset)
123 {
124 const struct pt_regs_offset *roff;
125 for (roff = regoffset_table; roff->name != NULL; roff++)
126 if (roff->offset == offset)
127 return roff->name;
128 return NULL;
129 }
130
131 /*
132 * does not yet catch signals sent when the child dies.
133 * in exit.c or in signal.c.
134 */
135
136 /*
137 * Determines which flags the user has access to [1 = access, 0 = no access].
138 */
139 #define FLAG_MASK_32 ((unsigned long) \
140 (X86_EFLAGS_CF | X86_EFLAGS_PF | \
141 X86_EFLAGS_AF | X86_EFLAGS_ZF | \
142 X86_EFLAGS_SF | X86_EFLAGS_TF | \
143 X86_EFLAGS_DF | X86_EFLAGS_OF | \
144 X86_EFLAGS_RF | X86_EFLAGS_AC))
145
146 /*
147 * Determines whether a value may be installed in a segment register.
148 */
invalid_selector(u16 value)149 static inline bool invalid_selector(u16 value)
150 {
151 return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL);
152 }
153
154 #ifdef CONFIG_X86_32
155
156 #define FLAG_MASK FLAG_MASK_32
157
pt_regs_access(struct pt_regs * regs,unsigned long regno)158 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
159 {
160 BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
161 return ®s->bx + (regno >> 2);
162 }
163
get_segment_reg(struct task_struct * task,unsigned long offset)164 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
165 {
166 /*
167 * Returning the value truncates it to 16 bits.
168 */
169 unsigned int retval;
170 if (offset != offsetof(struct user_regs_struct, gs))
171 retval = *pt_regs_access(task_pt_regs(task), offset);
172 else {
173 if (task == current)
174 retval = get_user_gs(task_pt_regs(task));
175 else
176 retval = task_user_gs(task);
177 }
178 return retval;
179 }
180
set_segment_reg(struct task_struct * task,unsigned long offset,u16 value)181 static int set_segment_reg(struct task_struct *task,
182 unsigned long offset, u16 value)
183 {
184 if (WARN_ON_ONCE(task == current))
185 return -EIO;
186
187 /*
188 * The value argument was already truncated to 16 bits.
189 */
190 if (invalid_selector(value))
191 return -EIO;
192
193 /*
194 * For %cs and %ss we cannot permit a null selector.
195 * We can permit a bogus selector as long as it has USER_RPL.
196 * Null selectors are fine for other segment registers, but
197 * we will never get back to user mode with invalid %cs or %ss
198 * and will take the trap in iret instead. Much code relies
199 * on user_mode() to distinguish a user trap frame (which can
200 * safely use invalid selectors) from a kernel trap frame.
201 */
202 switch (offset) {
203 case offsetof(struct user_regs_struct, cs):
204 case offsetof(struct user_regs_struct, ss):
205 if (unlikely(value == 0))
206 return -EIO;
207 fallthrough;
208
209 default:
210 *pt_regs_access(task_pt_regs(task), offset) = value;
211 break;
212
213 case offsetof(struct user_regs_struct, gs):
214 task_user_gs(task) = value;
215 }
216
217 return 0;
218 }
219
220 #else /* CONFIG_X86_64 */
221
222 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
223
pt_regs_access(struct pt_regs * regs,unsigned long offset)224 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
225 {
226 BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
227 return ®s->r15 + (offset / sizeof(regs->r15));
228 }
229
get_segment_reg(struct task_struct * task,unsigned long offset)230 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
231 {
232 /*
233 * Returning the value truncates it to 16 bits.
234 */
235 unsigned int seg;
236
237 switch (offset) {
238 case offsetof(struct user_regs_struct, fs):
239 if (task == current) {
240 /* Older gas can't assemble movq %?s,%r?? */
241 asm("movl %%fs,%0" : "=r" (seg));
242 return seg;
243 }
244 return task->thread.fsindex;
245 case offsetof(struct user_regs_struct, gs):
246 if (task == current) {
247 asm("movl %%gs,%0" : "=r" (seg));
248 return seg;
249 }
250 return task->thread.gsindex;
251 case offsetof(struct user_regs_struct, ds):
252 if (task == current) {
253 asm("movl %%ds,%0" : "=r" (seg));
254 return seg;
255 }
256 return task->thread.ds;
257 case offsetof(struct user_regs_struct, es):
258 if (task == current) {
259 asm("movl %%es,%0" : "=r" (seg));
260 return seg;
261 }
262 return task->thread.es;
263
264 case offsetof(struct user_regs_struct, cs):
265 case offsetof(struct user_regs_struct, ss):
266 break;
267 }
268 return *pt_regs_access(task_pt_regs(task), offset);
269 }
270
set_segment_reg(struct task_struct * task,unsigned long offset,u16 value)271 static int set_segment_reg(struct task_struct *task,
272 unsigned long offset, u16 value)
273 {
274 if (WARN_ON_ONCE(task == current))
275 return -EIO;
276
277 /*
278 * The value argument was already truncated to 16 bits.
279 */
280 if (invalid_selector(value))
281 return -EIO;
282
283 /*
284 * Writes to FS and GS will change the stored selector. Whether
285 * this changes the segment base as well depends on whether
286 * FSGSBASE is enabled.
287 */
288
289 switch (offset) {
290 case offsetof(struct user_regs_struct,fs):
291 task->thread.fsindex = value;
292 break;
293 case offsetof(struct user_regs_struct,gs):
294 task->thread.gsindex = value;
295 break;
296 case offsetof(struct user_regs_struct,ds):
297 task->thread.ds = value;
298 break;
299 case offsetof(struct user_regs_struct,es):
300 task->thread.es = value;
301 break;
302
303 /*
304 * Can't actually change these in 64-bit mode.
305 */
306 case offsetof(struct user_regs_struct,cs):
307 if (unlikely(value == 0))
308 return -EIO;
309 task_pt_regs(task)->cs = value;
310 break;
311 case offsetof(struct user_regs_struct,ss):
312 if (unlikely(value == 0))
313 return -EIO;
314 task_pt_regs(task)->ss = value;
315 break;
316 }
317
318 return 0;
319 }
320
321 #endif /* CONFIG_X86_32 */
322
get_flags(struct task_struct * task)323 static unsigned long get_flags(struct task_struct *task)
324 {
325 unsigned long retval = task_pt_regs(task)->flags;
326
327 /*
328 * If the debugger set TF, hide it from the readout.
329 */
330 if (test_tsk_thread_flag(task, TIF_FORCED_TF))
331 retval &= ~X86_EFLAGS_TF;
332
333 return retval;
334 }
335
set_flags(struct task_struct * task,unsigned long value)336 static int set_flags(struct task_struct *task, unsigned long value)
337 {
338 struct pt_regs *regs = task_pt_regs(task);
339
340 /*
341 * If the user value contains TF, mark that
342 * it was not "us" (the debugger) that set it.
343 * If not, make sure it stays set if we had.
344 */
345 if (value & X86_EFLAGS_TF)
346 clear_tsk_thread_flag(task, TIF_FORCED_TF);
347 else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
348 value |= X86_EFLAGS_TF;
349
350 regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
351
352 return 0;
353 }
354
putreg(struct task_struct * child,unsigned long offset,unsigned long value)355 static int putreg(struct task_struct *child,
356 unsigned long offset, unsigned long value)
357 {
358 switch (offset) {
359 case offsetof(struct user_regs_struct, cs):
360 case offsetof(struct user_regs_struct, ds):
361 case offsetof(struct user_regs_struct, es):
362 case offsetof(struct user_regs_struct, fs):
363 case offsetof(struct user_regs_struct, gs):
364 case offsetof(struct user_regs_struct, ss):
365 return set_segment_reg(child, offset, value);
366
367 case offsetof(struct user_regs_struct, flags):
368 return set_flags(child, value);
369
370 #ifdef CONFIG_X86_64
371 case offsetof(struct user_regs_struct,fs_base):
372 if (value >= TASK_SIZE_MAX)
373 return -EIO;
374 x86_fsbase_write_task(child, value);
375 return 0;
376 case offsetof(struct user_regs_struct,gs_base):
377 if (value >= TASK_SIZE_MAX)
378 return -EIO;
379 x86_gsbase_write_task(child, value);
380 return 0;
381 #endif
382 }
383
384 *pt_regs_access(task_pt_regs(child), offset) = value;
385 return 0;
386 }
387
getreg(struct task_struct * task,unsigned long offset)388 static unsigned long getreg(struct task_struct *task, unsigned long offset)
389 {
390 switch (offset) {
391 case offsetof(struct user_regs_struct, cs):
392 case offsetof(struct user_regs_struct, ds):
393 case offsetof(struct user_regs_struct, es):
394 case offsetof(struct user_regs_struct, fs):
395 case offsetof(struct user_regs_struct, gs):
396 case offsetof(struct user_regs_struct, ss):
397 return get_segment_reg(task, offset);
398
399 case offsetof(struct user_regs_struct, flags):
400 return get_flags(task);
401
402 #ifdef CONFIG_X86_64
403 case offsetof(struct user_regs_struct, fs_base):
404 return x86_fsbase_read_task(task);
405 case offsetof(struct user_regs_struct, gs_base):
406 return x86_gsbase_read_task(task);
407 #endif
408 }
409
410 return *pt_regs_access(task_pt_regs(task), offset);
411 }
412
genregs_get(struct task_struct * target,const struct user_regset * regset,struct membuf to)413 static int genregs_get(struct task_struct *target,
414 const struct user_regset *regset,
415 struct membuf to)
416 {
417 int reg;
418
419 for (reg = 0; to.left; reg++)
420 membuf_store(&to, getreg(target, reg * sizeof(unsigned long)));
421 return 0;
422 }
423
genregs_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)424 static int genregs_set(struct task_struct *target,
425 const struct user_regset *regset,
426 unsigned int pos, unsigned int count,
427 const void *kbuf, const void __user *ubuf)
428 {
429 int ret = 0;
430 if (kbuf) {
431 const unsigned long *k = kbuf;
432 while (count >= sizeof(*k) && !ret) {
433 ret = putreg(target, pos, *k++);
434 count -= sizeof(*k);
435 pos += sizeof(*k);
436 }
437 } else {
438 const unsigned long __user *u = ubuf;
439 while (count >= sizeof(*u) && !ret) {
440 unsigned long word;
441 ret = __get_user(word, u++);
442 if (ret)
443 break;
444 ret = putreg(target, pos, word);
445 count -= sizeof(*u);
446 pos += sizeof(*u);
447 }
448 }
449 return ret;
450 }
451
ptrace_triggered(struct perf_event * bp,struct perf_sample_data * data,struct pt_regs * regs)452 static void ptrace_triggered(struct perf_event *bp,
453 struct perf_sample_data *data,
454 struct pt_regs *regs)
455 {
456 int i;
457 struct thread_struct *thread = &(current->thread);
458
459 /*
460 * Store in the virtual DR6 register the fact that the breakpoint
461 * was hit so the thread's debugger will see it.
462 */
463 for (i = 0; i < HBP_NUM; i++) {
464 if (thread->ptrace_bps[i] == bp)
465 break;
466 }
467
468 thread->virtual_dr6 |= (DR_TRAP0 << i);
469 }
470
471 /*
472 * Walk through every ptrace breakpoints for this thread and
473 * build the dr7 value on top of their attributes.
474 *
475 */
ptrace_get_dr7(struct perf_event * bp[])476 static unsigned long ptrace_get_dr7(struct perf_event *bp[])
477 {
478 int i;
479 int dr7 = 0;
480 struct arch_hw_breakpoint *info;
481
482 for (i = 0; i < HBP_NUM; i++) {
483 if (bp[i] && !bp[i]->attr.disabled) {
484 info = counter_arch_bp(bp[i]);
485 dr7 |= encode_dr7(i, info->len, info->type);
486 }
487 }
488
489 return dr7;
490 }
491
ptrace_fill_bp_fields(struct perf_event_attr * attr,int len,int type,bool disabled)492 static int ptrace_fill_bp_fields(struct perf_event_attr *attr,
493 int len, int type, bool disabled)
494 {
495 int err, bp_len, bp_type;
496
497 err = arch_bp_generic_fields(len, type, &bp_len, &bp_type);
498 if (!err) {
499 attr->bp_len = bp_len;
500 attr->bp_type = bp_type;
501 attr->disabled = disabled;
502 }
503
504 return err;
505 }
506
507 static struct perf_event *
ptrace_register_breakpoint(struct task_struct * tsk,int len,int type,unsigned long addr,bool disabled)508 ptrace_register_breakpoint(struct task_struct *tsk, int len, int type,
509 unsigned long addr, bool disabled)
510 {
511 struct perf_event_attr attr;
512 int err;
513
514 ptrace_breakpoint_init(&attr);
515 attr.bp_addr = addr;
516
517 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
518 if (err)
519 return ERR_PTR(err);
520
521 return register_user_hw_breakpoint(&attr, ptrace_triggered,
522 NULL, tsk);
523 }
524
ptrace_modify_breakpoint(struct perf_event * bp,int len,int type,int disabled)525 static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type,
526 int disabled)
527 {
528 struct perf_event_attr attr = bp->attr;
529 int err;
530
531 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
532 if (err)
533 return err;
534
535 return modify_user_hw_breakpoint(bp, &attr);
536 }
537
538 /*
539 * Handle ptrace writes to debug register 7.
540 */
ptrace_write_dr7(struct task_struct * tsk,unsigned long data)541 static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data)
542 {
543 struct thread_struct *thread = &tsk->thread;
544 unsigned long old_dr7;
545 bool second_pass = false;
546 int i, rc, ret = 0;
547
548 data &= ~DR_CONTROL_RESERVED;
549 old_dr7 = ptrace_get_dr7(thread->ptrace_bps);
550
551 restore:
552 rc = 0;
553 for (i = 0; i < HBP_NUM; i++) {
554 unsigned len, type;
555 bool disabled = !decode_dr7(data, i, &len, &type);
556 struct perf_event *bp = thread->ptrace_bps[i];
557
558 if (!bp) {
559 if (disabled)
560 continue;
561
562 bp = ptrace_register_breakpoint(tsk,
563 len, type, 0, disabled);
564 if (IS_ERR(bp)) {
565 rc = PTR_ERR(bp);
566 break;
567 }
568
569 thread->ptrace_bps[i] = bp;
570 continue;
571 }
572
573 rc = ptrace_modify_breakpoint(bp, len, type, disabled);
574 if (rc)
575 break;
576 }
577
578 /* Restore if the first pass failed, second_pass shouldn't fail. */
579 if (rc && !WARN_ON(second_pass)) {
580 ret = rc;
581 data = old_dr7;
582 second_pass = true;
583 goto restore;
584 }
585
586 return ret;
587 }
588
589 /*
590 * Handle PTRACE_PEEKUSR calls for the debug register area.
591 */
ptrace_get_debugreg(struct task_struct * tsk,int n)592 static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
593 {
594 struct thread_struct *thread = &tsk->thread;
595 unsigned long val = 0;
596
597 if (n < HBP_NUM) {
598 int index = array_index_nospec(n, HBP_NUM);
599 struct perf_event *bp = thread->ptrace_bps[index];
600
601 if (bp)
602 val = bp->hw.info.address;
603 } else if (n == 6) {
604 val = thread->virtual_dr6 ^ DR6_RESERVED; /* Flip back to arch polarity */
605 } else if (n == 7) {
606 val = thread->ptrace_dr7;
607 }
608 return val;
609 }
610
ptrace_set_breakpoint_addr(struct task_struct * tsk,int nr,unsigned long addr)611 static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr,
612 unsigned long addr)
613 {
614 struct thread_struct *t = &tsk->thread;
615 struct perf_event *bp = t->ptrace_bps[nr];
616 int err = 0;
617
618 if (!bp) {
619 /*
620 * Put stub len and type to create an inactive but correct bp.
621 *
622 * CHECKME: the previous code returned -EIO if the addr wasn't
623 * a valid task virtual addr. The new one will return -EINVAL in
624 * this case.
625 * -EINVAL may be what we want for in-kernel breakpoints users,
626 * but -EIO looks better for ptrace, since we refuse a register
627 * writing for the user. And anyway this is the previous
628 * behaviour.
629 */
630 bp = ptrace_register_breakpoint(tsk,
631 X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE,
632 addr, true);
633 if (IS_ERR(bp))
634 err = PTR_ERR(bp);
635 else
636 t->ptrace_bps[nr] = bp;
637 } else {
638 struct perf_event_attr attr = bp->attr;
639
640 attr.bp_addr = addr;
641 err = modify_user_hw_breakpoint(bp, &attr);
642 }
643
644 return err;
645 }
646
647 /*
648 * Handle PTRACE_POKEUSR calls for the debug register area.
649 */
ptrace_set_debugreg(struct task_struct * tsk,int n,unsigned long val)650 static int ptrace_set_debugreg(struct task_struct *tsk, int n,
651 unsigned long val)
652 {
653 struct thread_struct *thread = &tsk->thread;
654 /* There are no DR4 or DR5 registers */
655 int rc = -EIO;
656
657 if (n < HBP_NUM) {
658 rc = ptrace_set_breakpoint_addr(tsk, n, val);
659 } else if (n == 6) {
660 thread->virtual_dr6 = val ^ DR6_RESERVED; /* Flip to positive polarity */
661 rc = 0;
662 } else if (n == 7) {
663 rc = ptrace_write_dr7(tsk, val);
664 if (!rc)
665 thread->ptrace_dr7 = val;
666 }
667 return rc;
668 }
669
670 /*
671 * These access the current or another (stopped) task's io permission
672 * bitmap for debugging or core dump.
673 */
ioperm_active(struct task_struct * target,const struct user_regset * regset)674 static int ioperm_active(struct task_struct *target,
675 const struct user_regset *regset)
676 {
677 struct io_bitmap *iobm = target->thread.io_bitmap;
678
679 return iobm ? DIV_ROUND_UP(iobm->max, regset->size) : 0;
680 }
681
ioperm_get(struct task_struct * target,const struct user_regset * regset,struct membuf to)682 static int ioperm_get(struct task_struct *target,
683 const struct user_regset *regset,
684 struct membuf to)
685 {
686 struct io_bitmap *iobm = target->thread.io_bitmap;
687
688 if (!iobm)
689 return -ENXIO;
690
691 return membuf_write(&to, iobm->bitmap, IO_BITMAP_BYTES);
692 }
693
694 /*
695 * Called by kernel/ptrace.c when detaching..
696 *
697 * Make sure the single step bit is not set.
698 */
ptrace_disable(struct task_struct * child)699 void ptrace_disable(struct task_struct *child)
700 {
701 user_disable_single_step(child);
702 }
703
704 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
705 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
706 #endif
707 #ifdef CONFIG_X86_64
708 static const struct user_regset_view user_x86_64_view; /* Initialized below. */
709 #endif
710
arch_ptrace(struct task_struct * child,long request,unsigned long addr,unsigned long data)711 long arch_ptrace(struct task_struct *child, long request,
712 unsigned long addr, unsigned long data)
713 {
714 int ret;
715 unsigned long __user *datap = (unsigned long __user *)data;
716
717 #ifdef CONFIG_X86_64
718 /* This is native 64-bit ptrace() */
719 const struct user_regset_view *regset_view = &user_x86_64_view;
720 #else
721 /* This is native 32-bit ptrace() */
722 const struct user_regset_view *regset_view = &user_x86_32_view;
723 #endif
724
725 switch (request) {
726 /* read the word at location addr in the USER area. */
727 case PTRACE_PEEKUSR: {
728 unsigned long tmp;
729
730 ret = -EIO;
731 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
732 break;
733
734 tmp = 0; /* Default return condition */
735 if (addr < sizeof(struct user_regs_struct))
736 tmp = getreg(child, addr);
737 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
738 addr <= offsetof(struct user, u_debugreg[7])) {
739 addr -= offsetof(struct user, u_debugreg[0]);
740 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
741 }
742 ret = put_user(tmp, datap);
743 break;
744 }
745
746 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
747 ret = -EIO;
748 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
749 break;
750
751 if (addr < sizeof(struct user_regs_struct))
752 ret = putreg(child, addr, data);
753 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
754 addr <= offsetof(struct user, u_debugreg[7])) {
755 addr -= offsetof(struct user, u_debugreg[0]);
756 ret = ptrace_set_debugreg(child,
757 addr / sizeof(data), data);
758 }
759 break;
760
761 case PTRACE_GETREGS: /* Get all gp regs from the child. */
762 return copy_regset_to_user(child,
763 regset_view,
764 REGSET_GENERAL,
765 0, sizeof(struct user_regs_struct),
766 datap);
767
768 case PTRACE_SETREGS: /* Set all gp regs in the child. */
769 return copy_regset_from_user(child,
770 regset_view,
771 REGSET_GENERAL,
772 0, sizeof(struct user_regs_struct),
773 datap);
774
775 case PTRACE_GETFPREGS: /* Get the child FPU state. */
776 return copy_regset_to_user(child,
777 regset_view,
778 REGSET_FP,
779 0, sizeof(struct user_i387_struct),
780 datap);
781
782 case PTRACE_SETFPREGS: /* Set the child FPU state. */
783 return copy_regset_from_user(child,
784 regset_view,
785 REGSET_FP,
786 0, sizeof(struct user_i387_struct),
787 datap);
788
789 #ifdef CONFIG_X86_32
790 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
791 return copy_regset_to_user(child, &user_x86_32_view,
792 REGSET_XFP,
793 0, sizeof(struct user_fxsr_struct),
794 datap) ? -EIO : 0;
795
796 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
797 return copy_regset_from_user(child, &user_x86_32_view,
798 REGSET_XFP,
799 0, sizeof(struct user_fxsr_struct),
800 datap) ? -EIO : 0;
801 #endif
802
803 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
804 case PTRACE_GET_THREAD_AREA:
805 if ((int) addr < 0)
806 return -EIO;
807 ret = do_get_thread_area(child, addr,
808 (struct user_desc __user *)data);
809 break;
810
811 case PTRACE_SET_THREAD_AREA:
812 if ((int) addr < 0)
813 return -EIO;
814 ret = do_set_thread_area(child, addr,
815 (struct user_desc __user *)data, 0);
816 break;
817 #endif
818
819 #ifdef CONFIG_X86_64
820 /* normal 64bit interface to access TLS data.
821 Works just like arch_prctl, except that the arguments
822 are reversed. */
823 case PTRACE_ARCH_PRCTL:
824 ret = do_arch_prctl_64(child, data, addr);
825 break;
826 #endif
827
828 default:
829 ret = ptrace_request(child, request, addr, data);
830 break;
831 }
832
833 return ret;
834 }
835
836 #ifdef CONFIG_IA32_EMULATION
837
838 #include <linux/compat.h>
839 #include <linux/syscalls.h>
840 #include <asm/ia32.h>
841 #include <asm/user32.h>
842
843 #define R32(l,q) \
844 case offsetof(struct user32, regs.l): \
845 regs->q = value; break
846
847 #define SEG32(rs) \
848 case offsetof(struct user32, regs.rs): \
849 return set_segment_reg(child, \
850 offsetof(struct user_regs_struct, rs), \
851 value); \
852 break
853
putreg32(struct task_struct * child,unsigned regno,u32 value)854 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
855 {
856 struct pt_regs *regs = task_pt_regs(child);
857 int ret;
858
859 switch (regno) {
860
861 SEG32(cs);
862 SEG32(ds);
863 SEG32(es);
864
865 /*
866 * A 32-bit ptracer on a 64-bit kernel expects that writing
867 * FS or GS will also update the base. This is needed for
868 * operations like PTRACE_SETREGS to fully restore a saved
869 * CPU state.
870 */
871
872 case offsetof(struct user32, regs.fs):
873 ret = set_segment_reg(child,
874 offsetof(struct user_regs_struct, fs),
875 value);
876 if (ret == 0)
877 child->thread.fsbase =
878 x86_fsgsbase_read_task(child, value);
879 return ret;
880
881 case offsetof(struct user32, regs.gs):
882 ret = set_segment_reg(child,
883 offsetof(struct user_regs_struct, gs),
884 value);
885 if (ret == 0)
886 child->thread.gsbase =
887 x86_fsgsbase_read_task(child, value);
888 return ret;
889
890 SEG32(ss);
891
892 R32(ebx, bx);
893 R32(ecx, cx);
894 R32(edx, dx);
895 R32(edi, di);
896 R32(esi, si);
897 R32(ebp, bp);
898 R32(eax, ax);
899 R32(eip, ip);
900 R32(esp, sp);
901
902 case offsetof(struct user32, regs.orig_eax):
903 /*
904 * Warning: bizarre corner case fixup here. A 32-bit
905 * debugger setting orig_eax to -1 wants to disable
906 * syscall restart. Make sure that the syscall
907 * restart code sign-extends orig_ax. Also make sure
908 * we interpret the -ERESTART* codes correctly if
909 * loaded into regs->ax in case the task is not
910 * actually still sitting at the exit from a 32-bit
911 * syscall with TS_COMPAT still set.
912 */
913 regs->orig_ax = value;
914 if (syscall_get_nr(child, regs) != -1)
915 child->thread_info.status |= TS_I386_REGS_POKED;
916 break;
917
918 case offsetof(struct user32, regs.eflags):
919 return set_flags(child, value);
920
921 case offsetof(struct user32, u_debugreg[0]) ...
922 offsetof(struct user32, u_debugreg[7]):
923 regno -= offsetof(struct user32, u_debugreg[0]);
924 return ptrace_set_debugreg(child, regno / 4, value);
925
926 default:
927 if (regno > sizeof(struct user32) || (regno & 3))
928 return -EIO;
929
930 /*
931 * Other dummy fields in the virtual user structure
932 * are ignored
933 */
934 break;
935 }
936 return 0;
937 }
938
939 #undef R32
940 #undef SEG32
941
942 #define R32(l,q) \
943 case offsetof(struct user32, regs.l): \
944 *val = regs->q; break
945
946 #define SEG32(rs) \
947 case offsetof(struct user32, regs.rs): \
948 *val = get_segment_reg(child, \
949 offsetof(struct user_regs_struct, rs)); \
950 break
951
getreg32(struct task_struct * child,unsigned regno,u32 * val)952 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
953 {
954 struct pt_regs *regs = task_pt_regs(child);
955
956 switch (regno) {
957
958 SEG32(ds);
959 SEG32(es);
960 SEG32(fs);
961 SEG32(gs);
962
963 R32(cs, cs);
964 R32(ss, ss);
965 R32(ebx, bx);
966 R32(ecx, cx);
967 R32(edx, dx);
968 R32(edi, di);
969 R32(esi, si);
970 R32(ebp, bp);
971 R32(eax, ax);
972 R32(orig_eax, orig_ax);
973 R32(eip, ip);
974 R32(esp, sp);
975
976 case offsetof(struct user32, regs.eflags):
977 *val = get_flags(child);
978 break;
979
980 case offsetof(struct user32, u_debugreg[0]) ...
981 offsetof(struct user32, u_debugreg[7]):
982 regno -= offsetof(struct user32, u_debugreg[0]);
983 *val = ptrace_get_debugreg(child, regno / 4);
984 break;
985
986 default:
987 if (regno > sizeof(struct user32) || (regno & 3))
988 return -EIO;
989
990 /*
991 * Other dummy fields in the virtual user structure
992 * are ignored
993 */
994 *val = 0;
995 break;
996 }
997 return 0;
998 }
999
1000 #undef R32
1001 #undef SEG32
1002
genregs32_get(struct task_struct * target,const struct user_regset * regset,struct membuf to)1003 static int genregs32_get(struct task_struct *target,
1004 const struct user_regset *regset,
1005 struct membuf to)
1006 {
1007 int reg;
1008
1009 for (reg = 0; to.left; reg++) {
1010 u32 val;
1011 getreg32(target, reg * 4, &val);
1012 membuf_store(&to, val);
1013 }
1014 return 0;
1015 }
1016
genregs32_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)1017 static int genregs32_set(struct task_struct *target,
1018 const struct user_regset *regset,
1019 unsigned int pos, unsigned int count,
1020 const void *kbuf, const void __user *ubuf)
1021 {
1022 int ret = 0;
1023 if (kbuf) {
1024 const compat_ulong_t *k = kbuf;
1025 while (count >= sizeof(*k) && !ret) {
1026 ret = putreg32(target, pos, *k++);
1027 count -= sizeof(*k);
1028 pos += sizeof(*k);
1029 }
1030 } else {
1031 const compat_ulong_t __user *u = ubuf;
1032 while (count >= sizeof(*u) && !ret) {
1033 compat_ulong_t word;
1034 ret = __get_user(word, u++);
1035 if (ret)
1036 break;
1037 ret = putreg32(target, pos, word);
1038 count -= sizeof(*u);
1039 pos += sizeof(*u);
1040 }
1041 }
1042 return ret;
1043 }
1044
ia32_arch_ptrace(struct task_struct * child,compat_long_t request,compat_ulong_t caddr,compat_ulong_t cdata)1045 static long ia32_arch_ptrace(struct task_struct *child, compat_long_t request,
1046 compat_ulong_t caddr, compat_ulong_t cdata)
1047 {
1048 unsigned long addr = caddr;
1049 unsigned long data = cdata;
1050 void __user *datap = compat_ptr(data);
1051 int ret;
1052 __u32 val;
1053
1054 switch (request) {
1055 case PTRACE_PEEKUSR:
1056 ret = getreg32(child, addr, &val);
1057 if (ret == 0)
1058 ret = put_user(val, (__u32 __user *)datap);
1059 break;
1060
1061 case PTRACE_POKEUSR:
1062 ret = putreg32(child, addr, data);
1063 break;
1064
1065 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1066 return copy_regset_to_user(child, &user_x86_32_view,
1067 REGSET_GENERAL,
1068 0, sizeof(struct user_regs_struct32),
1069 datap);
1070
1071 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1072 return copy_regset_from_user(child, &user_x86_32_view,
1073 REGSET_GENERAL, 0,
1074 sizeof(struct user_regs_struct32),
1075 datap);
1076
1077 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1078 return copy_regset_to_user(child, &user_x86_32_view,
1079 REGSET_FP, 0,
1080 sizeof(struct user_i387_ia32_struct),
1081 datap);
1082
1083 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1084 return copy_regset_from_user(
1085 child, &user_x86_32_view, REGSET_FP,
1086 0, sizeof(struct user_i387_ia32_struct), datap);
1087
1088 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1089 return copy_regset_to_user(child, &user_x86_32_view,
1090 REGSET_XFP, 0,
1091 sizeof(struct user32_fxsr_struct),
1092 datap);
1093
1094 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1095 return copy_regset_from_user(child, &user_x86_32_view,
1096 REGSET_XFP, 0,
1097 sizeof(struct user32_fxsr_struct),
1098 datap);
1099
1100 case PTRACE_GET_THREAD_AREA:
1101 case PTRACE_SET_THREAD_AREA:
1102 return arch_ptrace(child, request, addr, data);
1103
1104 default:
1105 return compat_ptrace_request(child, request, addr, data);
1106 }
1107
1108 return ret;
1109 }
1110 #endif /* CONFIG_IA32_EMULATION */
1111
1112 #ifdef CONFIG_X86_X32_ABI
x32_arch_ptrace(struct task_struct * child,compat_long_t request,compat_ulong_t caddr,compat_ulong_t cdata)1113 static long x32_arch_ptrace(struct task_struct *child,
1114 compat_long_t request, compat_ulong_t caddr,
1115 compat_ulong_t cdata)
1116 {
1117 unsigned long addr = caddr;
1118 unsigned long data = cdata;
1119 void __user *datap = compat_ptr(data);
1120 int ret;
1121
1122 switch (request) {
1123 /* Read 32bits at location addr in the USER area. Only allow
1124 to return the lower 32bits of segment and debug registers. */
1125 case PTRACE_PEEKUSR: {
1126 u32 tmp;
1127
1128 ret = -EIO;
1129 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1130 addr < offsetof(struct user_regs_struct, cs))
1131 break;
1132
1133 tmp = 0; /* Default return condition */
1134 if (addr < sizeof(struct user_regs_struct))
1135 tmp = getreg(child, addr);
1136 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1137 addr <= offsetof(struct user, u_debugreg[7])) {
1138 addr -= offsetof(struct user, u_debugreg[0]);
1139 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
1140 }
1141 ret = put_user(tmp, (__u32 __user *)datap);
1142 break;
1143 }
1144
1145 /* Write the word at location addr in the USER area. Only allow
1146 to update segment and debug registers with the upper 32bits
1147 zero-extended. */
1148 case PTRACE_POKEUSR:
1149 ret = -EIO;
1150 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1151 addr < offsetof(struct user_regs_struct, cs))
1152 break;
1153
1154 if (addr < sizeof(struct user_regs_struct))
1155 ret = putreg(child, addr, data);
1156 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1157 addr <= offsetof(struct user, u_debugreg[7])) {
1158 addr -= offsetof(struct user, u_debugreg[0]);
1159 ret = ptrace_set_debugreg(child,
1160 addr / sizeof(data), data);
1161 }
1162 break;
1163
1164 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1165 return copy_regset_to_user(child,
1166 &user_x86_64_view,
1167 REGSET_GENERAL,
1168 0, sizeof(struct user_regs_struct),
1169 datap);
1170
1171 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1172 return copy_regset_from_user(child,
1173 &user_x86_64_view,
1174 REGSET_GENERAL,
1175 0, sizeof(struct user_regs_struct),
1176 datap);
1177
1178 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1179 return copy_regset_to_user(child,
1180 &user_x86_64_view,
1181 REGSET_FP,
1182 0, sizeof(struct user_i387_struct),
1183 datap);
1184
1185 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1186 return copy_regset_from_user(child,
1187 &user_x86_64_view,
1188 REGSET_FP,
1189 0, sizeof(struct user_i387_struct),
1190 datap);
1191
1192 default:
1193 return compat_ptrace_request(child, request, addr, data);
1194 }
1195
1196 return ret;
1197 }
1198 #endif
1199
1200 #ifdef CONFIG_COMPAT
compat_arch_ptrace(struct task_struct * child,compat_long_t request,compat_ulong_t caddr,compat_ulong_t cdata)1201 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1202 compat_ulong_t caddr, compat_ulong_t cdata)
1203 {
1204 #ifdef CONFIG_X86_X32_ABI
1205 if (!in_ia32_syscall())
1206 return x32_arch_ptrace(child, request, caddr, cdata);
1207 #endif
1208 #ifdef CONFIG_IA32_EMULATION
1209 return ia32_arch_ptrace(child, request, caddr, cdata);
1210 #else
1211 return 0;
1212 #endif
1213 }
1214 #endif /* CONFIG_COMPAT */
1215
1216 #ifdef CONFIG_X86_64
1217
1218 static struct user_regset x86_64_regsets[] __ro_after_init = {
1219 [REGSET_GENERAL] = {
1220 .core_note_type = NT_PRSTATUS,
1221 .n = sizeof(struct user_regs_struct) / sizeof(long),
1222 .size = sizeof(long), .align = sizeof(long),
1223 .regset_get = genregs_get, .set = genregs_set
1224 },
1225 [REGSET_FP] = {
1226 .core_note_type = NT_PRFPREG,
1227 .n = sizeof(struct fxregs_state) / sizeof(long),
1228 .size = sizeof(long), .align = sizeof(long),
1229 .active = regset_xregset_fpregs_active, .regset_get = xfpregs_get, .set = xfpregs_set
1230 },
1231 [REGSET_XSTATE] = {
1232 .core_note_type = NT_X86_XSTATE,
1233 .size = sizeof(u64), .align = sizeof(u64),
1234 .active = xstateregs_active, .regset_get = xstateregs_get,
1235 .set = xstateregs_set
1236 },
1237 [REGSET_IOPERM64] = {
1238 .core_note_type = NT_386_IOPERM,
1239 .n = IO_BITMAP_LONGS,
1240 .size = sizeof(long), .align = sizeof(long),
1241 .active = ioperm_active, .regset_get = ioperm_get
1242 },
1243 };
1244
1245 static const struct user_regset_view user_x86_64_view = {
1246 .name = "x86_64", .e_machine = EM_X86_64,
1247 .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1248 };
1249
1250 #else /* CONFIG_X86_32 */
1251
1252 #define user_regs_struct32 user_regs_struct
1253 #define genregs32_get genregs_get
1254 #define genregs32_set genregs_set
1255
1256 #endif /* CONFIG_X86_64 */
1257
1258 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1259 static struct user_regset x86_32_regsets[] __ro_after_init = {
1260 [REGSET_GENERAL] = {
1261 .core_note_type = NT_PRSTATUS,
1262 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1263 .size = sizeof(u32), .align = sizeof(u32),
1264 .regset_get = genregs32_get, .set = genregs32_set
1265 },
1266 [REGSET_FP] = {
1267 .core_note_type = NT_PRFPREG,
1268 .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32),
1269 .size = sizeof(u32), .align = sizeof(u32),
1270 .active = regset_fpregs_active, .regset_get = fpregs_get, .set = fpregs_set
1271 },
1272 [REGSET_XFP] = {
1273 .core_note_type = NT_PRXFPREG,
1274 .n = sizeof(struct fxregs_state) / sizeof(u32),
1275 .size = sizeof(u32), .align = sizeof(u32),
1276 .active = regset_xregset_fpregs_active, .regset_get = xfpregs_get, .set = xfpregs_set
1277 },
1278 [REGSET_XSTATE] = {
1279 .core_note_type = NT_X86_XSTATE,
1280 .size = sizeof(u64), .align = sizeof(u64),
1281 .active = xstateregs_active, .regset_get = xstateregs_get,
1282 .set = xstateregs_set
1283 },
1284 [REGSET_TLS] = {
1285 .core_note_type = NT_386_TLS,
1286 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1287 .size = sizeof(struct user_desc),
1288 .align = sizeof(struct user_desc),
1289 .active = regset_tls_active,
1290 .regset_get = regset_tls_get, .set = regset_tls_set
1291 },
1292 [REGSET_IOPERM32] = {
1293 .core_note_type = NT_386_IOPERM,
1294 .n = IO_BITMAP_BYTES / sizeof(u32),
1295 .size = sizeof(u32), .align = sizeof(u32),
1296 .active = ioperm_active, .regset_get = ioperm_get
1297 },
1298 };
1299
1300 static const struct user_regset_view user_x86_32_view = {
1301 .name = "i386", .e_machine = EM_386,
1302 .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1303 };
1304 #endif
1305
1306 /*
1307 * This represents bytes 464..511 in the memory layout exported through
1308 * the REGSET_XSTATE interface.
1309 */
1310 u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
1311
update_regset_xstate_info(unsigned int size,u64 xstate_mask)1312 void __init update_regset_xstate_info(unsigned int size, u64 xstate_mask)
1313 {
1314 #ifdef CONFIG_X86_64
1315 x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1316 #endif
1317 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1318 x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1319 #endif
1320 xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask;
1321 }
1322
1323 /*
1324 * This is used by the core dump code to decide which regset to dump. The
1325 * core dump code writes out the resulting .e_machine and the corresponding
1326 * regsets. This is suboptimal if the task is messing around with its CS.L
1327 * field, but at worst the core dump will end up missing some information.
1328 *
1329 * Unfortunately, it is also used by the broken PTRACE_GETREGSET and
1330 * PTRACE_SETREGSET APIs. These APIs look at the .regsets field but have
1331 * no way to make sure that the e_machine they use matches the caller's
1332 * expectations. The result is that the data format returned by
1333 * PTRACE_GETREGSET depends on the returned CS field (and even the offset
1334 * of the returned CS field depends on its value!) and the data format
1335 * accepted by PTRACE_SETREGSET is determined by the old CS value. The
1336 * upshot is that it is basically impossible to use these APIs correctly.
1337 *
1338 * The best way to fix it in the long run would probably be to add new
1339 * improved ptrace() APIs to read and write registers reliably, possibly by
1340 * allowing userspace to select the ELF e_machine variant that they expect.
1341 */
task_user_regset_view(struct task_struct * task)1342 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1343 {
1344 #ifdef CONFIG_IA32_EMULATION
1345 if (!user_64bit_mode(task_pt_regs(task)))
1346 #endif
1347 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1348 return &user_x86_32_view;
1349 #endif
1350 #ifdef CONFIG_X86_64
1351 return &user_x86_64_view;
1352 #endif
1353 }
1354
send_sigtrap(struct pt_regs * regs,int error_code,int si_code)1355 void send_sigtrap(struct pt_regs *regs, int error_code, int si_code)
1356 {
1357 struct task_struct *tsk = current;
1358
1359 tsk->thread.trap_nr = X86_TRAP_DB;
1360 tsk->thread.error_code = error_code;
1361
1362 /* Send us the fake SIGTRAP */
1363 force_sig_fault(SIGTRAP, si_code,
1364 user_mode(regs) ? (void __user *)regs->ip : NULL);
1365 }
1366
user_single_step_report(struct pt_regs * regs)1367 void user_single_step_report(struct pt_regs *regs)
1368 {
1369 send_sigtrap(regs, 0, TRAP_BRKPT);
1370 }
1371