1 /* By Ross Biro 1/23/92 */
2 /*
3 * Pentium III FXSR, SSE support
4 * Gareth Hughes <gareth@valinux.com>, May 2000
5 */
6
7 #include <linux/kernel.h>
8 #include <linux/sched.h>
9 #include <linux/mm.h>
10 #include <linux/smp.h>
11 #include <linux/errno.h>
12 #include <linux/slab.h>
13 #include <linux/ptrace.h>
14 #include <linux/tracehook.h>
15 #include <linux/user.h>
16 #include <linux/elf.h>
17 #include <linux/security.h>
18 #include <linux/audit.h>
19 #include <linux/seccomp.h>
20 #include <linux/signal.h>
21 #include <linux/perf_event.h>
22 #include <linux/hw_breakpoint.h>
23 #include <linux/rcupdate.h>
24 #include <linux/export.h>
25 #include <linux/context_tracking.h>
26 #include <linux/nospec.h>
27
28 #include <asm/uaccess.h>
29 #include <asm/pgtable.h>
30 #include <asm/processor.h>
31 #include <asm/fpu/internal.h>
32 #include <asm/fpu/signal.h>
33 #include <asm/fpu/regset.h>
34 #include <asm/debugreg.h>
35 #include <asm/ldt.h>
36 #include <asm/desc.h>
37 #include <asm/prctl.h>
38 #include <asm/proto.h>
39 #include <asm/hw_breakpoint.h>
40 #include <asm/traps.h>
41 #include <asm/syscall.h>
42
43 #include "tls.h"
44
45 enum x86_regset {
46 REGSET_GENERAL,
47 REGSET_FP,
48 REGSET_XFP,
49 REGSET_IOPERM64 = REGSET_XFP,
50 REGSET_XSTATE,
51 REGSET_TLS,
52 REGSET_IOPERM32,
53 };
54
55 struct pt_regs_offset {
56 const char *name;
57 int offset;
58 };
59
60 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
61 #define REG_OFFSET_END {.name = NULL, .offset = 0}
62
63 static const struct pt_regs_offset regoffset_table[] = {
64 #ifdef CONFIG_X86_64
65 REG_OFFSET_NAME(r15),
66 REG_OFFSET_NAME(r14),
67 REG_OFFSET_NAME(r13),
68 REG_OFFSET_NAME(r12),
69 REG_OFFSET_NAME(r11),
70 REG_OFFSET_NAME(r10),
71 REG_OFFSET_NAME(r9),
72 REG_OFFSET_NAME(r8),
73 #endif
74 REG_OFFSET_NAME(bx),
75 REG_OFFSET_NAME(cx),
76 REG_OFFSET_NAME(dx),
77 REG_OFFSET_NAME(si),
78 REG_OFFSET_NAME(di),
79 REG_OFFSET_NAME(bp),
80 REG_OFFSET_NAME(ax),
81 #ifdef CONFIG_X86_32
82 REG_OFFSET_NAME(ds),
83 REG_OFFSET_NAME(es),
84 REG_OFFSET_NAME(fs),
85 REG_OFFSET_NAME(gs),
86 #endif
87 REG_OFFSET_NAME(orig_ax),
88 REG_OFFSET_NAME(ip),
89 REG_OFFSET_NAME(cs),
90 REG_OFFSET_NAME(flags),
91 REG_OFFSET_NAME(sp),
92 REG_OFFSET_NAME(ss),
93 REG_OFFSET_END,
94 };
95
96 /**
97 * regs_query_register_offset() - query register offset from its name
98 * @name: the name of a register
99 *
100 * regs_query_register_offset() returns the offset of a register in struct
101 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
102 */
regs_query_register_offset(const char * name)103 int regs_query_register_offset(const char *name)
104 {
105 const struct pt_regs_offset *roff;
106 for (roff = regoffset_table; roff->name != NULL; roff++)
107 if (!strcmp(roff->name, name))
108 return roff->offset;
109 return -EINVAL;
110 }
111
112 /**
113 * regs_query_register_name() - query register name from its offset
114 * @offset: the offset of a register in struct pt_regs.
115 *
116 * regs_query_register_name() returns the name of a register from its
117 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
118 */
regs_query_register_name(unsigned int offset)119 const char *regs_query_register_name(unsigned int offset)
120 {
121 const struct pt_regs_offset *roff;
122 for (roff = regoffset_table; roff->name != NULL; roff++)
123 if (roff->offset == offset)
124 return roff->name;
125 return NULL;
126 }
127
128 static const int arg_offs_table[] = {
129 #ifdef CONFIG_X86_32
130 [0] = offsetof(struct pt_regs, ax),
131 [1] = offsetof(struct pt_regs, dx),
132 [2] = offsetof(struct pt_regs, cx)
133 #else /* CONFIG_X86_64 */
134 [0] = offsetof(struct pt_regs, di),
135 [1] = offsetof(struct pt_regs, si),
136 [2] = offsetof(struct pt_regs, dx),
137 [3] = offsetof(struct pt_regs, cx),
138 [4] = offsetof(struct pt_regs, r8),
139 [5] = offsetof(struct pt_regs, r9)
140 #endif
141 };
142
143 /*
144 * does not yet catch signals sent when the child dies.
145 * in exit.c or in signal.c.
146 */
147
148 /*
149 * Determines which flags the user has access to [1 = access, 0 = no access].
150 */
151 #define FLAG_MASK_32 ((unsigned long) \
152 (X86_EFLAGS_CF | X86_EFLAGS_PF | \
153 X86_EFLAGS_AF | X86_EFLAGS_ZF | \
154 X86_EFLAGS_SF | X86_EFLAGS_TF | \
155 X86_EFLAGS_DF | X86_EFLAGS_OF | \
156 X86_EFLAGS_RF | X86_EFLAGS_AC))
157
158 /*
159 * Determines whether a value may be installed in a segment register.
160 */
invalid_selector(u16 value)161 static inline bool invalid_selector(u16 value)
162 {
163 return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL);
164 }
165
166 #ifdef CONFIG_X86_32
167
168 #define FLAG_MASK FLAG_MASK_32
169
170 /*
171 * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
172 * when it traps. The previous stack will be directly underneath the saved
173 * registers, and 'sp/ss' won't even have been saved. Thus the '®s->sp'.
174 *
175 * Now, if the stack is empty, '®s->sp' is out of range. In this
176 * case we try to take the previous stack. To always return a non-null
177 * stack pointer we fall back to regs as stack if no previous stack
178 * exists.
179 *
180 * This is valid only for kernel mode traps.
181 */
kernel_stack_pointer(struct pt_regs * regs)182 unsigned long kernel_stack_pointer(struct pt_regs *regs)
183 {
184 unsigned long context = (unsigned long)regs & ~(THREAD_SIZE - 1);
185 unsigned long sp = (unsigned long)®s->sp;
186 u32 *prev_esp;
187
188 if (context == (sp & ~(THREAD_SIZE - 1)))
189 return sp;
190
191 prev_esp = (u32 *)(context);
192 if (*prev_esp)
193 return (unsigned long)*prev_esp;
194
195 return (unsigned long)regs;
196 }
197 EXPORT_SYMBOL_GPL(kernel_stack_pointer);
198
pt_regs_access(struct pt_regs * regs,unsigned long regno)199 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
200 {
201 BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
202 return ®s->bx + (regno >> 2);
203 }
204
get_segment_reg(struct task_struct * task,unsigned long offset)205 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
206 {
207 /*
208 * Returning the value truncates it to 16 bits.
209 */
210 unsigned int retval;
211 if (offset != offsetof(struct user_regs_struct, gs))
212 retval = *pt_regs_access(task_pt_regs(task), offset);
213 else {
214 if (task == current)
215 retval = get_user_gs(task_pt_regs(task));
216 else
217 retval = task_user_gs(task);
218 }
219 return retval;
220 }
221
set_segment_reg(struct task_struct * task,unsigned long offset,u16 value)222 static int set_segment_reg(struct task_struct *task,
223 unsigned long offset, u16 value)
224 {
225 /*
226 * The value argument was already truncated to 16 bits.
227 */
228 if (invalid_selector(value))
229 return -EIO;
230
231 /*
232 * For %cs and %ss we cannot permit a null selector.
233 * We can permit a bogus selector as long as it has USER_RPL.
234 * Null selectors are fine for other segment registers, but
235 * we will never get back to user mode with invalid %cs or %ss
236 * and will take the trap in iret instead. Much code relies
237 * on user_mode() to distinguish a user trap frame (which can
238 * safely use invalid selectors) from a kernel trap frame.
239 */
240 switch (offset) {
241 case offsetof(struct user_regs_struct, cs):
242 case offsetof(struct user_regs_struct, ss):
243 if (unlikely(value == 0))
244 return -EIO;
245
246 default:
247 *pt_regs_access(task_pt_regs(task), offset) = value;
248 break;
249
250 case offsetof(struct user_regs_struct, gs):
251 if (task == current)
252 set_user_gs(task_pt_regs(task), value);
253 else
254 task_user_gs(task) = value;
255 }
256
257 return 0;
258 }
259
260 #else /* CONFIG_X86_64 */
261
262 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
263
pt_regs_access(struct pt_regs * regs,unsigned long offset)264 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
265 {
266 BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
267 return ®s->r15 + (offset / sizeof(regs->r15));
268 }
269
get_segment_reg(struct task_struct * task,unsigned long offset)270 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
271 {
272 /*
273 * Returning the value truncates it to 16 bits.
274 */
275 unsigned int seg;
276
277 switch (offset) {
278 case offsetof(struct user_regs_struct, fs):
279 if (task == current) {
280 /* Older gas can't assemble movq %?s,%r?? */
281 asm("movl %%fs,%0" : "=r" (seg));
282 return seg;
283 }
284 return task->thread.fsindex;
285 case offsetof(struct user_regs_struct, gs):
286 if (task == current) {
287 asm("movl %%gs,%0" : "=r" (seg));
288 return seg;
289 }
290 return task->thread.gsindex;
291 case offsetof(struct user_regs_struct, ds):
292 if (task == current) {
293 asm("movl %%ds,%0" : "=r" (seg));
294 return seg;
295 }
296 return task->thread.ds;
297 case offsetof(struct user_regs_struct, es):
298 if (task == current) {
299 asm("movl %%es,%0" : "=r" (seg));
300 return seg;
301 }
302 return task->thread.es;
303
304 case offsetof(struct user_regs_struct, cs):
305 case offsetof(struct user_regs_struct, ss):
306 break;
307 }
308 return *pt_regs_access(task_pt_regs(task), offset);
309 }
310
set_segment_reg(struct task_struct * task,unsigned long offset,u16 value)311 static int set_segment_reg(struct task_struct *task,
312 unsigned long offset, u16 value)
313 {
314 /*
315 * The value argument was already truncated to 16 bits.
316 */
317 if (invalid_selector(value))
318 return -EIO;
319
320 switch (offset) {
321 case offsetof(struct user_regs_struct,fs):
322 /*
323 * If this is setting fs as for normal 64-bit use but
324 * setting fs_base has implicitly changed it, leave it.
325 */
326 if ((value == FS_TLS_SEL && task->thread.fsindex == 0 &&
327 task->thread.fsbase != 0) ||
328 (value == 0 && task->thread.fsindex == FS_TLS_SEL &&
329 task->thread.fsbase == 0))
330 break;
331 task->thread.fsindex = value;
332 if (task == current)
333 loadsegment(fs, task->thread.fsindex);
334 break;
335 case offsetof(struct user_regs_struct,gs):
336 /*
337 * If this is setting gs as for normal 64-bit use but
338 * setting gs_base has implicitly changed it, leave it.
339 */
340 if ((value == GS_TLS_SEL && task->thread.gsindex == 0 &&
341 task->thread.gsbase != 0) ||
342 (value == 0 && task->thread.gsindex == GS_TLS_SEL &&
343 task->thread.gsbase == 0))
344 break;
345 task->thread.gsindex = value;
346 if (task == current)
347 load_gs_index(task->thread.gsindex);
348 break;
349 case offsetof(struct user_regs_struct,ds):
350 task->thread.ds = value;
351 if (task == current)
352 loadsegment(ds, task->thread.ds);
353 break;
354 case offsetof(struct user_regs_struct,es):
355 task->thread.es = value;
356 if (task == current)
357 loadsegment(es, task->thread.es);
358 break;
359
360 /*
361 * Can't actually change these in 64-bit mode.
362 */
363 case offsetof(struct user_regs_struct,cs):
364 if (unlikely(value == 0))
365 return -EIO;
366 task_pt_regs(task)->cs = value;
367 break;
368 case offsetof(struct user_regs_struct,ss):
369 if (unlikely(value == 0))
370 return -EIO;
371 task_pt_regs(task)->ss = value;
372 break;
373 }
374
375 return 0;
376 }
377
378 #endif /* CONFIG_X86_32 */
379
get_flags(struct task_struct * task)380 static unsigned long get_flags(struct task_struct *task)
381 {
382 unsigned long retval = task_pt_regs(task)->flags;
383
384 /*
385 * If the debugger set TF, hide it from the readout.
386 */
387 if (test_tsk_thread_flag(task, TIF_FORCED_TF))
388 retval &= ~X86_EFLAGS_TF;
389
390 return retval;
391 }
392
set_flags(struct task_struct * task,unsigned long value)393 static int set_flags(struct task_struct *task, unsigned long value)
394 {
395 struct pt_regs *regs = task_pt_regs(task);
396
397 /*
398 * If the user value contains TF, mark that
399 * it was not "us" (the debugger) that set it.
400 * If not, make sure it stays set if we had.
401 */
402 if (value & X86_EFLAGS_TF)
403 clear_tsk_thread_flag(task, TIF_FORCED_TF);
404 else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
405 value |= X86_EFLAGS_TF;
406
407 regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
408
409 return 0;
410 }
411
putreg(struct task_struct * child,unsigned long offset,unsigned long value)412 static int putreg(struct task_struct *child,
413 unsigned long offset, unsigned long value)
414 {
415 switch (offset) {
416 case offsetof(struct user_regs_struct, cs):
417 case offsetof(struct user_regs_struct, ds):
418 case offsetof(struct user_regs_struct, es):
419 case offsetof(struct user_regs_struct, fs):
420 case offsetof(struct user_regs_struct, gs):
421 case offsetof(struct user_regs_struct, ss):
422 return set_segment_reg(child, offset, value);
423
424 case offsetof(struct user_regs_struct, flags):
425 return set_flags(child, value);
426
427 #ifdef CONFIG_X86_64
428 case offsetof(struct user_regs_struct,fs_base):
429 if (value >= TASK_SIZE_OF(child))
430 return -EIO;
431 /*
432 * When changing the segment base, use do_arch_prctl
433 * to set either thread.fsbase or thread.fsindex and the
434 * corresponding GDT slot.
435 */
436 if (child->thread.fsbase != value)
437 return do_arch_prctl(child, ARCH_SET_FS, value);
438 return 0;
439 case offsetof(struct user_regs_struct,gs_base):
440 /*
441 * Exactly the same here as the %fs handling above.
442 */
443 if (value >= TASK_SIZE_OF(child))
444 return -EIO;
445 if (child->thread.gsbase != value)
446 return do_arch_prctl(child, ARCH_SET_GS, value);
447 return 0;
448 #endif
449 }
450
451 *pt_regs_access(task_pt_regs(child), offset) = value;
452 return 0;
453 }
454
getreg(struct task_struct * task,unsigned long offset)455 static unsigned long getreg(struct task_struct *task, unsigned long offset)
456 {
457 switch (offset) {
458 case offsetof(struct user_regs_struct, cs):
459 case offsetof(struct user_regs_struct, ds):
460 case offsetof(struct user_regs_struct, es):
461 case offsetof(struct user_regs_struct, fs):
462 case offsetof(struct user_regs_struct, gs):
463 case offsetof(struct user_regs_struct, ss):
464 return get_segment_reg(task, offset);
465
466 case offsetof(struct user_regs_struct, flags):
467 return get_flags(task);
468
469 #ifdef CONFIG_X86_64
470 case offsetof(struct user_regs_struct, fs_base): {
471 /*
472 * do_arch_prctl may have used a GDT slot instead of
473 * the MSR. To userland, it appears the same either
474 * way, except the %fs segment selector might not be 0.
475 */
476 unsigned int seg = task->thread.fsindex;
477 if (task->thread.fsbase != 0)
478 return task->thread.fsbase;
479 if (task == current)
480 asm("movl %%fs,%0" : "=r" (seg));
481 if (seg != FS_TLS_SEL)
482 return 0;
483 return get_desc_base(&task->thread.tls_array[FS_TLS]);
484 }
485 case offsetof(struct user_regs_struct, gs_base): {
486 /*
487 * Exactly the same here as the %fs handling above.
488 */
489 unsigned int seg = task->thread.gsindex;
490 if (task->thread.gsbase != 0)
491 return task->thread.gsbase;
492 if (task == current)
493 asm("movl %%gs,%0" : "=r" (seg));
494 if (seg != GS_TLS_SEL)
495 return 0;
496 return get_desc_base(&task->thread.tls_array[GS_TLS]);
497 }
498 #endif
499 }
500
501 return *pt_regs_access(task_pt_regs(task), offset);
502 }
503
genregs_get(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,void * kbuf,void __user * ubuf)504 static int genregs_get(struct task_struct *target,
505 const struct user_regset *regset,
506 unsigned int pos, unsigned int count,
507 void *kbuf, void __user *ubuf)
508 {
509 if (kbuf) {
510 unsigned long *k = kbuf;
511 while (count >= sizeof(*k)) {
512 *k++ = getreg(target, pos);
513 count -= sizeof(*k);
514 pos += sizeof(*k);
515 }
516 } else {
517 unsigned long __user *u = ubuf;
518 while (count >= sizeof(*u)) {
519 if (__put_user(getreg(target, pos), u++))
520 return -EFAULT;
521 count -= sizeof(*u);
522 pos += sizeof(*u);
523 }
524 }
525
526 return 0;
527 }
528
genregs_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)529 static int genregs_set(struct task_struct *target,
530 const struct user_regset *regset,
531 unsigned int pos, unsigned int count,
532 const void *kbuf, const void __user *ubuf)
533 {
534 int ret = 0;
535 if (kbuf) {
536 const unsigned long *k = kbuf;
537 while (count >= sizeof(*k) && !ret) {
538 ret = putreg(target, pos, *k++);
539 count -= sizeof(*k);
540 pos += sizeof(*k);
541 }
542 } else {
543 const unsigned long __user *u = ubuf;
544 while (count >= sizeof(*u) && !ret) {
545 unsigned long word;
546 ret = __get_user(word, u++);
547 if (ret)
548 break;
549 ret = putreg(target, pos, word);
550 count -= sizeof(*u);
551 pos += sizeof(*u);
552 }
553 }
554 return ret;
555 }
556
ptrace_triggered(struct perf_event * bp,struct perf_sample_data * data,struct pt_regs * regs)557 static void ptrace_triggered(struct perf_event *bp,
558 struct perf_sample_data *data,
559 struct pt_regs *regs)
560 {
561 int i;
562 struct thread_struct *thread = &(current->thread);
563
564 /*
565 * Store in the virtual DR6 register the fact that the breakpoint
566 * was hit so the thread's debugger will see it.
567 */
568 for (i = 0; i < HBP_NUM; i++) {
569 if (thread->ptrace_bps[i] == bp)
570 break;
571 }
572
573 thread->debugreg6 |= (DR_TRAP0 << i);
574 }
575
576 /*
577 * Walk through every ptrace breakpoints for this thread and
578 * build the dr7 value on top of their attributes.
579 *
580 */
ptrace_get_dr7(struct perf_event * bp[])581 static unsigned long ptrace_get_dr7(struct perf_event *bp[])
582 {
583 int i;
584 int dr7 = 0;
585 struct arch_hw_breakpoint *info;
586
587 for (i = 0; i < HBP_NUM; i++) {
588 if (bp[i] && !bp[i]->attr.disabled) {
589 info = counter_arch_bp(bp[i]);
590 dr7 |= encode_dr7(i, info->len, info->type);
591 }
592 }
593
594 return dr7;
595 }
596
ptrace_fill_bp_fields(struct perf_event_attr * attr,int len,int type,bool disabled)597 static int ptrace_fill_bp_fields(struct perf_event_attr *attr,
598 int len, int type, bool disabled)
599 {
600 int err, bp_len, bp_type;
601
602 err = arch_bp_generic_fields(len, type, &bp_len, &bp_type);
603 if (!err) {
604 attr->bp_len = bp_len;
605 attr->bp_type = bp_type;
606 attr->disabled = disabled;
607 }
608
609 return err;
610 }
611
612 static struct perf_event *
ptrace_register_breakpoint(struct task_struct * tsk,int len,int type,unsigned long addr,bool disabled)613 ptrace_register_breakpoint(struct task_struct *tsk, int len, int type,
614 unsigned long addr, bool disabled)
615 {
616 struct perf_event_attr attr;
617 int err;
618
619 ptrace_breakpoint_init(&attr);
620 attr.bp_addr = addr;
621
622 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
623 if (err)
624 return ERR_PTR(err);
625
626 return register_user_hw_breakpoint(&attr, ptrace_triggered,
627 NULL, tsk);
628 }
629
ptrace_modify_breakpoint(struct perf_event * bp,int len,int type,int disabled)630 static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type,
631 int disabled)
632 {
633 struct perf_event_attr attr = bp->attr;
634 int err;
635
636 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
637 if (err)
638 return err;
639
640 return modify_user_hw_breakpoint(bp, &attr);
641 }
642
643 /*
644 * Handle ptrace writes to debug register 7.
645 */
ptrace_write_dr7(struct task_struct * tsk,unsigned long data)646 static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data)
647 {
648 struct thread_struct *thread = &tsk->thread;
649 unsigned long old_dr7;
650 bool second_pass = false;
651 int i, rc, ret = 0;
652
653 data &= ~DR_CONTROL_RESERVED;
654 old_dr7 = ptrace_get_dr7(thread->ptrace_bps);
655
656 restore:
657 rc = 0;
658 for (i = 0; i < HBP_NUM; i++) {
659 unsigned len, type;
660 bool disabled = !decode_dr7(data, i, &len, &type);
661 struct perf_event *bp = thread->ptrace_bps[i];
662
663 if (!bp) {
664 if (disabled)
665 continue;
666
667 bp = ptrace_register_breakpoint(tsk,
668 len, type, 0, disabled);
669 if (IS_ERR(bp)) {
670 rc = PTR_ERR(bp);
671 break;
672 }
673
674 thread->ptrace_bps[i] = bp;
675 continue;
676 }
677
678 rc = ptrace_modify_breakpoint(bp, len, type, disabled);
679 if (rc)
680 break;
681 }
682
683 /* Restore if the first pass failed, second_pass shouldn't fail. */
684 if (rc && !WARN_ON(second_pass)) {
685 ret = rc;
686 data = old_dr7;
687 second_pass = true;
688 goto restore;
689 }
690
691 return ret;
692 }
693
694 /*
695 * Handle PTRACE_PEEKUSR calls for the debug register area.
696 */
ptrace_get_debugreg(struct task_struct * tsk,int n)697 static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
698 {
699 struct thread_struct *thread = &tsk->thread;
700 unsigned long val = 0;
701
702 if (n < HBP_NUM) {
703 int index = array_index_nospec(n, HBP_NUM);
704 struct perf_event *bp = thread->ptrace_bps[index];
705
706 if (bp)
707 val = bp->hw.info.address;
708 } else if (n == 6) {
709 val = thread->debugreg6;
710 } else if (n == 7) {
711 val = thread->ptrace_dr7;
712 }
713 return val;
714 }
715
ptrace_set_breakpoint_addr(struct task_struct * tsk,int nr,unsigned long addr)716 static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr,
717 unsigned long addr)
718 {
719 struct thread_struct *t = &tsk->thread;
720 struct perf_event *bp = t->ptrace_bps[nr];
721 int err = 0;
722
723 if (!bp) {
724 /*
725 * Put stub len and type to create an inactive but correct bp.
726 *
727 * CHECKME: the previous code returned -EIO if the addr wasn't
728 * a valid task virtual addr. The new one will return -EINVAL in
729 * this case.
730 * -EINVAL may be what we want for in-kernel breakpoints users,
731 * but -EIO looks better for ptrace, since we refuse a register
732 * writing for the user. And anyway this is the previous
733 * behaviour.
734 */
735 bp = ptrace_register_breakpoint(tsk,
736 X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE,
737 addr, true);
738 if (IS_ERR(bp))
739 err = PTR_ERR(bp);
740 else
741 t->ptrace_bps[nr] = bp;
742 } else {
743 struct perf_event_attr attr = bp->attr;
744
745 attr.bp_addr = addr;
746 err = modify_user_hw_breakpoint(bp, &attr);
747 }
748
749 return err;
750 }
751
752 /*
753 * Handle PTRACE_POKEUSR calls for the debug register area.
754 */
ptrace_set_debugreg(struct task_struct * tsk,int n,unsigned long val)755 static int ptrace_set_debugreg(struct task_struct *tsk, int n,
756 unsigned long val)
757 {
758 struct thread_struct *thread = &tsk->thread;
759 /* There are no DR4 or DR5 registers */
760 int rc = -EIO;
761
762 if (n < HBP_NUM) {
763 rc = ptrace_set_breakpoint_addr(tsk, n, val);
764 } else if (n == 6) {
765 thread->debugreg6 = val;
766 rc = 0;
767 } else if (n == 7) {
768 rc = ptrace_write_dr7(tsk, val);
769 if (!rc)
770 thread->ptrace_dr7 = val;
771 }
772 return rc;
773 }
774
775 /*
776 * These access the current or another (stopped) task's io permission
777 * bitmap for debugging or core dump.
778 */
ioperm_active(struct task_struct * target,const struct user_regset * regset)779 static int ioperm_active(struct task_struct *target,
780 const struct user_regset *regset)
781 {
782 return target->thread.io_bitmap_max / regset->size;
783 }
784
ioperm_get(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,void * kbuf,void __user * ubuf)785 static int ioperm_get(struct task_struct *target,
786 const struct user_regset *regset,
787 unsigned int pos, unsigned int count,
788 void *kbuf, void __user *ubuf)
789 {
790 if (!target->thread.io_bitmap_ptr)
791 return -ENXIO;
792
793 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
794 target->thread.io_bitmap_ptr,
795 0, IO_BITMAP_BYTES);
796 }
797
798 /*
799 * Called by kernel/ptrace.c when detaching..
800 *
801 * Make sure the single step bit is not set.
802 */
ptrace_disable(struct task_struct * child)803 void ptrace_disable(struct task_struct *child)
804 {
805 user_disable_single_step(child);
806 #ifdef TIF_SYSCALL_EMU
807 clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
808 #endif
809 }
810
811 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
812 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
813 #endif
814
arch_ptrace(struct task_struct * child,long request,unsigned long addr,unsigned long data)815 long arch_ptrace(struct task_struct *child, long request,
816 unsigned long addr, unsigned long data)
817 {
818 int ret;
819 unsigned long __user *datap = (unsigned long __user *)data;
820
821 switch (request) {
822 /* read the word at location addr in the USER area. */
823 case PTRACE_PEEKUSR: {
824 unsigned long tmp;
825
826 ret = -EIO;
827 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
828 break;
829
830 tmp = 0; /* Default return condition */
831 if (addr < sizeof(struct user_regs_struct))
832 tmp = getreg(child, addr);
833 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
834 addr <= offsetof(struct user, u_debugreg[7])) {
835 addr -= offsetof(struct user, u_debugreg[0]);
836 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
837 }
838 ret = put_user(tmp, datap);
839 break;
840 }
841
842 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
843 ret = -EIO;
844 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
845 break;
846
847 if (addr < sizeof(struct user_regs_struct))
848 ret = putreg(child, addr, data);
849 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
850 addr <= offsetof(struct user, u_debugreg[7])) {
851 addr -= offsetof(struct user, u_debugreg[0]);
852 ret = ptrace_set_debugreg(child,
853 addr / sizeof(data), data);
854 }
855 break;
856
857 case PTRACE_GETREGS: /* Get all gp regs from the child. */
858 return copy_regset_to_user(child,
859 task_user_regset_view(current),
860 REGSET_GENERAL,
861 0, sizeof(struct user_regs_struct),
862 datap);
863
864 case PTRACE_SETREGS: /* Set all gp regs in the child. */
865 return copy_regset_from_user(child,
866 task_user_regset_view(current),
867 REGSET_GENERAL,
868 0, sizeof(struct user_regs_struct),
869 datap);
870
871 case PTRACE_GETFPREGS: /* Get the child FPU state. */
872 return copy_regset_to_user(child,
873 task_user_regset_view(current),
874 REGSET_FP,
875 0, sizeof(struct user_i387_struct),
876 datap);
877
878 case PTRACE_SETFPREGS: /* Set the child FPU state. */
879 return copy_regset_from_user(child,
880 task_user_regset_view(current),
881 REGSET_FP,
882 0, sizeof(struct user_i387_struct),
883 datap);
884
885 #ifdef CONFIG_X86_32
886 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
887 return copy_regset_to_user(child, &user_x86_32_view,
888 REGSET_XFP,
889 0, sizeof(struct user_fxsr_struct),
890 datap) ? -EIO : 0;
891
892 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
893 return copy_regset_from_user(child, &user_x86_32_view,
894 REGSET_XFP,
895 0, sizeof(struct user_fxsr_struct),
896 datap) ? -EIO : 0;
897 #endif
898
899 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
900 case PTRACE_GET_THREAD_AREA:
901 if ((int) addr < 0)
902 return -EIO;
903 ret = do_get_thread_area(child, addr,
904 (struct user_desc __user *)data);
905 break;
906
907 case PTRACE_SET_THREAD_AREA:
908 if ((int) addr < 0)
909 return -EIO;
910 ret = do_set_thread_area(child, addr,
911 (struct user_desc __user *)data, 0);
912 break;
913 #endif
914
915 #ifdef CONFIG_X86_64
916 /* normal 64bit interface to access TLS data.
917 Works just like arch_prctl, except that the arguments
918 are reversed. */
919 case PTRACE_ARCH_PRCTL:
920 ret = do_arch_prctl(child, data, addr);
921 break;
922 #endif
923
924 default:
925 ret = ptrace_request(child, request, addr, data);
926 break;
927 }
928
929 return ret;
930 }
931
932 #ifdef CONFIG_IA32_EMULATION
933
934 #include <linux/compat.h>
935 #include <linux/syscalls.h>
936 #include <asm/ia32.h>
937 #include <asm/user32.h>
938
939 #define R32(l,q) \
940 case offsetof(struct user32, regs.l): \
941 regs->q = value; break
942
943 #define SEG32(rs) \
944 case offsetof(struct user32, regs.rs): \
945 return set_segment_reg(child, \
946 offsetof(struct user_regs_struct, rs), \
947 value); \
948 break
949
putreg32(struct task_struct * child,unsigned regno,u32 value)950 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
951 {
952 struct pt_regs *regs = task_pt_regs(child);
953
954 switch (regno) {
955
956 SEG32(cs);
957 SEG32(ds);
958 SEG32(es);
959 SEG32(fs);
960 SEG32(gs);
961 SEG32(ss);
962
963 R32(ebx, bx);
964 R32(ecx, cx);
965 R32(edx, dx);
966 R32(edi, di);
967 R32(esi, si);
968 R32(ebp, bp);
969 R32(eax, ax);
970 R32(eip, ip);
971 R32(esp, sp);
972
973 case offsetof(struct user32, regs.orig_eax):
974 /*
975 * A 32-bit debugger setting orig_eax means to restore
976 * the state of the task restarting a 32-bit syscall.
977 * Make sure we interpret the -ERESTART* codes correctly
978 * in case the task is not actually still sitting at the
979 * exit from a 32-bit syscall with TS_COMPAT still set.
980 */
981 regs->orig_ax = value;
982 if (syscall_get_nr(child, regs) >= 0)
983 task_thread_info(child)->status |= TS_COMPAT;
984 break;
985
986 case offsetof(struct user32, regs.eflags):
987 return set_flags(child, value);
988
989 case offsetof(struct user32, u_debugreg[0]) ...
990 offsetof(struct user32, u_debugreg[7]):
991 regno -= offsetof(struct user32, u_debugreg[0]);
992 return ptrace_set_debugreg(child, regno / 4, value);
993
994 default:
995 if (regno > sizeof(struct user32) || (regno & 3))
996 return -EIO;
997
998 /*
999 * Other dummy fields in the virtual user structure
1000 * are ignored
1001 */
1002 break;
1003 }
1004 return 0;
1005 }
1006
1007 #undef R32
1008 #undef SEG32
1009
1010 #define R32(l,q) \
1011 case offsetof(struct user32, regs.l): \
1012 *val = regs->q; break
1013
1014 #define SEG32(rs) \
1015 case offsetof(struct user32, regs.rs): \
1016 *val = get_segment_reg(child, \
1017 offsetof(struct user_regs_struct, rs)); \
1018 break
1019
getreg32(struct task_struct * child,unsigned regno,u32 * val)1020 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
1021 {
1022 struct pt_regs *regs = task_pt_regs(child);
1023
1024 switch (regno) {
1025
1026 SEG32(ds);
1027 SEG32(es);
1028 SEG32(fs);
1029 SEG32(gs);
1030
1031 R32(cs, cs);
1032 R32(ss, ss);
1033 R32(ebx, bx);
1034 R32(ecx, cx);
1035 R32(edx, dx);
1036 R32(edi, di);
1037 R32(esi, si);
1038 R32(ebp, bp);
1039 R32(eax, ax);
1040 R32(orig_eax, orig_ax);
1041 R32(eip, ip);
1042 R32(esp, sp);
1043
1044 case offsetof(struct user32, regs.eflags):
1045 *val = get_flags(child);
1046 break;
1047
1048 case offsetof(struct user32, u_debugreg[0]) ...
1049 offsetof(struct user32, u_debugreg[7]):
1050 regno -= offsetof(struct user32, u_debugreg[0]);
1051 *val = ptrace_get_debugreg(child, regno / 4);
1052 break;
1053
1054 default:
1055 if (regno > sizeof(struct user32) || (regno & 3))
1056 return -EIO;
1057
1058 /*
1059 * Other dummy fields in the virtual user structure
1060 * are ignored
1061 */
1062 *val = 0;
1063 break;
1064 }
1065 return 0;
1066 }
1067
1068 #undef R32
1069 #undef SEG32
1070
genregs32_get(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,void * kbuf,void __user * ubuf)1071 static int genregs32_get(struct task_struct *target,
1072 const struct user_regset *regset,
1073 unsigned int pos, unsigned int count,
1074 void *kbuf, void __user *ubuf)
1075 {
1076 if (kbuf) {
1077 compat_ulong_t *k = kbuf;
1078 while (count >= sizeof(*k)) {
1079 getreg32(target, pos, k++);
1080 count -= sizeof(*k);
1081 pos += sizeof(*k);
1082 }
1083 } else {
1084 compat_ulong_t __user *u = ubuf;
1085 while (count >= sizeof(*u)) {
1086 compat_ulong_t word;
1087 getreg32(target, pos, &word);
1088 if (__put_user(word, u++))
1089 return -EFAULT;
1090 count -= sizeof(*u);
1091 pos += sizeof(*u);
1092 }
1093 }
1094
1095 return 0;
1096 }
1097
genregs32_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)1098 static int genregs32_set(struct task_struct *target,
1099 const struct user_regset *regset,
1100 unsigned int pos, unsigned int count,
1101 const void *kbuf, const void __user *ubuf)
1102 {
1103 int ret = 0;
1104 if (kbuf) {
1105 const compat_ulong_t *k = kbuf;
1106 while (count >= sizeof(*k) && !ret) {
1107 ret = putreg32(target, pos, *k++);
1108 count -= sizeof(*k);
1109 pos += sizeof(*k);
1110 }
1111 } else {
1112 const compat_ulong_t __user *u = ubuf;
1113 while (count >= sizeof(*u) && !ret) {
1114 compat_ulong_t word;
1115 ret = __get_user(word, u++);
1116 if (ret)
1117 break;
1118 ret = putreg32(target, pos, word);
1119 count -= sizeof(*u);
1120 pos += sizeof(*u);
1121 }
1122 }
1123 return ret;
1124 }
1125
ia32_arch_ptrace(struct task_struct * child,compat_long_t request,compat_ulong_t caddr,compat_ulong_t cdata)1126 static long ia32_arch_ptrace(struct task_struct *child, compat_long_t request,
1127 compat_ulong_t caddr, compat_ulong_t cdata)
1128 {
1129 unsigned long addr = caddr;
1130 unsigned long data = cdata;
1131 void __user *datap = compat_ptr(data);
1132 int ret;
1133 __u32 val;
1134
1135 switch (request) {
1136 case PTRACE_PEEKUSR:
1137 ret = getreg32(child, addr, &val);
1138 if (ret == 0)
1139 ret = put_user(val, (__u32 __user *)datap);
1140 break;
1141
1142 case PTRACE_POKEUSR:
1143 ret = putreg32(child, addr, data);
1144 break;
1145
1146 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1147 return copy_regset_to_user(child, &user_x86_32_view,
1148 REGSET_GENERAL,
1149 0, sizeof(struct user_regs_struct32),
1150 datap);
1151
1152 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1153 return copy_regset_from_user(child, &user_x86_32_view,
1154 REGSET_GENERAL, 0,
1155 sizeof(struct user_regs_struct32),
1156 datap);
1157
1158 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1159 return copy_regset_to_user(child, &user_x86_32_view,
1160 REGSET_FP, 0,
1161 sizeof(struct user_i387_ia32_struct),
1162 datap);
1163
1164 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1165 return copy_regset_from_user(
1166 child, &user_x86_32_view, REGSET_FP,
1167 0, sizeof(struct user_i387_ia32_struct), datap);
1168
1169 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1170 return copy_regset_to_user(child, &user_x86_32_view,
1171 REGSET_XFP, 0,
1172 sizeof(struct user32_fxsr_struct),
1173 datap);
1174
1175 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1176 return copy_regset_from_user(child, &user_x86_32_view,
1177 REGSET_XFP, 0,
1178 sizeof(struct user32_fxsr_struct),
1179 datap);
1180
1181 case PTRACE_GET_THREAD_AREA:
1182 case PTRACE_SET_THREAD_AREA:
1183 return arch_ptrace(child, request, addr, data);
1184
1185 default:
1186 return compat_ptrace_request(child, request, addr, data);
1187 }
1188
1189 return ret;
1190 }
1191 #endif /* CONFIG_IA32_EMULATION */
1192
1193 #ifdef CONFIG_X86_X32_ABI
x32_arch_ptrace(struct task_struct * child,compat_long_t request,compat_ulong_t caddr,compat_ulong_t cdata)1194 static long x32_arch_ptrace(struct task_struct *child,
1195 compat_long_t request, compat_ulong_t caddr,
1196 compat_ulong_t cdata)
1197 {
1198 unsigned long addr = caddr;
1199 unsigned long data = cdata;
1200 void __user *datap = compat_ptr(data);
1201 int ret;
1202
1203 switch (request) {
1204 /* Read 32bits at location addr in the USER area. Only allow
1205 to return the lower 32bits of segment and debug registers. */
1206 case PTRACE_PEEKUSR: {
1207 u32 tmp;
1208
1209 ret = -EIO;
1210 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1211 addr < offsetof(struct user_regs_struct, cs))
1212 break;
1213
1214 tmp = 0; /* Default return condition */
1215 if (addr < sizeof(struct user_regs_struct))
1216 tmp = getreg(child, addr);
1217 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1218 addr <= offsetof(struct user, u_debugreg[7])) {
1219 addr -= offsetof(struct user, u_debugreg[0]);
1220 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
1221 }
1222 ret = put_user(tmp, (__u32 __user *)datap);
1223 break;
1224 }
1225
1226 /* Write the word at location addr in the USER area. Only allow
1227 to update segment and debug registers with the upper 32bits
1228 zero-extended. */
1229 case PTRACE_POKEUSR:
1230 ret = -EIO;
1231 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1232 addr < offsetof(struct user_regs_struct, cs))
1233 break;
1234
1235 if (addr < sizeof(struct user_regs_struct))
1236 ret = putreg(child, addr, data);
1237 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1238 addr <= offsetof(struct user, u_debugreg[7])) {
1239 addr -= offsetof(struct user, u_debugreg[0]);
1240 ret = ptrace_set_debugreg(child,
1241 addr / sizeof(data), data);
1242 }
1243 break;
1244
1245 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1246 return copy_regset_to_user(child,
1247 task_user_regset_view(current),
1248 REGSET_GENERAL,
1249 0, sizeof(struct user_regs_struct),
1250 datap);
1251
1252 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1253 return copy_regset_from_user(child,
1254 task_user_regset_view(current),
1255 REGSET_GENERAL,
1256 0, sizeof(struct user_regs_struct),
1257 datap);
1258
1259 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1260 return copy_regset_to_user(child,
1261 task_user_regset_view(current),
1262 REGSET_FP,
1263 0, sizeof(struct user_i387_struct),
1264 datap);
1265
1266 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1267 return copy_regset_from_user(child,
1268 task_user_regset_view(current),
1269 REGSET_FP,
1270 0, sizeof(struct user_i387_struct),
1271 datap);
1272
1273 default:
1274 return compat_ptrace_request(child, request, addr, data);
1275 }
1276
1277 return ret;
1278 }
1279 #endif
1280
1281 #ifdef CONFIG_COMPAT
compat_arch_ptrace(struct task_struct * child,compat_long_t request,compat_ulong_t caddr,compat_ulong_t cdata)1282 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1283 compat_ulong_t caddr, compat_ulong_t cdata)
1284 {
1285 #ifdef CONFIG_X86_X32_ABI
1286 if (!is_ia32_task())
1287 return x32_arch_ptrace(child, request, caddr, cdata);
1288 #endif
1289 #ifdef CONFIG_IA32_EMULATION
1290 return ia32_arch_ptrace(child, request, caddr, cdata);
1291 #else
1292 return 0;
1293 #endif
1294 }
1295 #endif /* CONFIG_COMPAT */
1296
1297 #ifdef CONFIG_X86_64
1298
1299 static struct user_regset x86_64_regsets[] __read_mostly = {
1300 [REGSET_GENERAL] = {
1301 .core_note_type = NT_PRSTATUS,
1302 .n = sizeof(struct user_regs_struct) / sizeof(long),
1303 .size = sizeof(long), .align = sizeof(long),
1304 .get = genregs_get, .set = genregs_set
1305 },
1306 [REGSET_FP] = {
1307 .core_note_type = NT_PRFPREG,
1308 .n = sizeof(struct user_i387_struct) / sizeof(long),
1309 .size = sizeof(long), .align = sizeof(long),
1310 .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set
1311 },
1312 [REGSET_XSTATE] = {
1313 .core_note_type = NT_X86_XSTATE,
1314 .size = sizeof(u64), .align = sizeof(u64),
1315 .active = xstateregs_active, .get = xstateregs_get,
1316 .set = xstateregs_set
1317 },
1318 [REGSET_IOPERM64] = {
1319 .core_note_type = NT_386_IOPERM,
1320 .n = IO_BITMAP_LONGS,
1321 .size = sizeof(long), .align = sizeof(long),
1322 .active = ioperm_active, .get = ioperm_get
1323 },
1324 };
1325
1326 static const struct user_regset_view user_x86_64_view = {
1327 .name = "x86_64", .e_machine = EM_X86_64,
1328 .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1329 };
1330
1331 #else /* CONFIG_X86_32 */
1332
1333 #define user_regs_struct32 user_regs_struct
1334 #define genregs32_get genregs_get
1335 #define genregs32_set genregs_set
1336
1337 #endif /* CONFIG_X86_64 */
1338
1339 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1340 static struct user_regset x86_32_regsets[] __read_mostly = {
1341 [REGSET_GENERAL] = {
1342 .core_note_type = NT_PRSTATUS,
1343 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1344 .size = sizeof(u32), .align = sizeof(u32),
1345 .get = genregs32_get, .set = genregs32_set
1346 },
1347 [REGSET_FP] = {
1348 .core_note_type = NT_PRFPREG,
1349 .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32),
1350 .size = sizeof(u32), .align = sizeof(u32),
1351 .active = regset_fpregs_active, .get = fpregs_get, .set = fpregs_set
1352 },
1353 [REGSET_XFP] = {
1354 .core_note_type = NT_PRXFPREG,
1355 .n = sizeof(struct user32_fxsr_struct) / sizeof(u32),
1356 .size = sizeof(u32), .align = sizeof(u32),
1357 .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set
1358 },
1359 [REGSET_XSTATE] = {
1360 .core_note_type = NT_X86_XSTATE,
1361 .size = sizeof(u64), .align = sizeof(u64),
1362 .active = xstateregs_active, .get = xstateregs_get,
1363 .set = xstateregs_set
1364 },
1365 [REGSET_TLS] = {
1366 .core_note_type = NT_386_TLS,
1367 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1368 .size = sizeof(struct user_desc),
1369 .align = sizeof(struct user_desc),
1370 .active = regset_tls_active,
1371 .get = regset_tls_get, .set = regset_tls_set
1372 },
1373 [REGSET_IOPERM32] = {
1374 .core_note_type = NT_386_IOPERM,
1375 .n = IO_BITMAP_BYTES / sizeof(u32),
1376 .size = sizeof(u32), .align = sizeof(u32),
1377 .active = ioperm_active, .get = ioperm_get
1378 },
1379 };
1380
1381 static const struct user_regset_view user_x86_32_view = {
1382 .name = "i386", .e_machine = EM_386,
1383 .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1384 };
1385 #endif
1386
1387 /*
1388 * This represents bytes 464..511 in the memory layout exported through
1389 * the REGSET_XSTATE interface.
1390 */
1391 u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
1392
update_regset_xstate_info(unsigned int size,u64 xstate_mask)1393 void update_regset_xstate_info(unsigned int size, u64 xstate_mask)
1394 {
1395 #ifdef CONFIG_X86_64
1396 x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1397 #endif
1398 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1399 x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1400 #endif
1401 xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask;
1402 }
1403
task_user_regset_view(struct task_struct * task)1404 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1405 {
1406 #ifdef CONFIG_IA32_EMULATION
1407 if (test_tsk_thread_flag(task, TIF_IA32))
1408 #endif
1409 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1410 return &user_x86_32_view;
1411 #endif
1412 #ifdef CONFIG_X86_64
1413 return &user_x86_64_view;
1414 #endif
1415 }
1416
fill_sigtrap_info(struct task_struct * tsk,struct pt_regs * regs,int error_code,int si_code,struct siginfo * info)1417 static void fill_sigtrap_info(struct task_struct *tsk,
1418 struct pt_regs *regs,
1419 int error_code, int si_code,
1420 struct siginfo *info)
1421 {
1422 tsk->thread.trap_nr = X86_TRAP_DB;
1423 tsk->thread.error_code = error_code;
1424
1425 memset(info, 0, sizeof(*info));
1426 info->si_signo = SIGTRAP;
1427 info->si_code = si_code;
1428 info->si_addr = user_mode(regs) ? (void __user *)regs->ip : NULL;
1429 }
1430
user_single_step_siginfo(struct task_struct * tsk,struct pt_regs * regs,struct siginfo * info)1431 void user_single_step_siginfo(struct task_struct *tsk,
1432 struct pt_regs *regs,
1433 struct siginfo *info)
1434 {
1435 fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info);
1436 }
1437
send_sigtrap(struct task_struct * tsk,struct pt_regs * regs,int error_code,int si_code)1438 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
1439 int error_code, int si_code)
1440 {
1441 struct siginfo info;
1442
1443 fill_sigtrap_info(tsk, regs, error_code, si_code, &info);
1444 /* Send us the fake SIGTRAP */
1445 force_sig_info(SIGTRAP, &info, tsk);
1446 }
1447