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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/pgtable.h>
32#include <asm/processor.h>
33#include <asm/fpu/internal.h>
34#include <asm/fpu/signal.h>
35#include <asm/fpu/regset.h>
36#include <asm/debugreg.h>
37#include <asm/ldt.h>
38#include <asm/desc.h>
39#include <asm/prctl.h>
40#include <asm/proto.h>
41#include <asm/hw_breakpoint.h>
42#include <asm/traps.h>
43#include <asm/syscall.h>
44#include <asm/fsgsbase.h>
45
46#include "tls.h"
47
48enum 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
58struct 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
66static 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 */
106int 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 */
122const 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 */
149static 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
158static 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
164static 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
181static int set_segment_reg(struct task_struct *task,
182 unsigned long offset, u16 value)
183{
184 /*
185 * The value argument was already truncated to 16 bits.
186 */
187 if (invalid_selector(value))
188 return -EIO;
189
190 /*
191 * For %cs and %ss we cannot permit a null selector.
192 * We can permit a bogus selector as long as it has USER_RPL.
193 * Null selectors are fine for other segment registers, but
194 * we will never get back to user mode with invalid %cs or %ss
195 * and will take the trap in iret instead. Much code relies
196 * on user_mode() to distinguish a user trap frame (which can
197 * safely use invalid selectors) from a kernel trap frame.
198 */
199 switch (offset) {
200 case offsetof(struct user_regs_struct, cs):
201 case offsetof(struct user_regs_struct, ss):
202 if (unlikely(value == 0))
203 return -EIO;
204 /* Else, fall through */
205
206 default:
207 *pt_regs_access(task_pt_regs(task), offset) = value;
208 break;
209
210 case offsetof(struct user_regs_struct, gs):
211 if (task == current)
212 set_user_gs(task_pt_regs(task), value);
213 else
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
224static 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
230static 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
271static int set_segment_reg(struct task_struct *task,
272 unsigned long offset, u16 value)
273{
274 /*
275 * The value argument was already truncated to 16 bits.
276 */
277 if (invalid_selector(value))
278 return -EIO;
279
280 switch (offset) {
281 case offsetof(struct user_regs_struct,fs):
282 task->thread.fsindex = value;
283 if (task == current)
284 loadsegment(fs, task->thread.fsindex);
285 break;
286 case offsetof(struct user_regs_struct,gs):
287 task->thread.gsindex = value;
288 if (task == current)
289 load_gs_index(task->thread.gsindex);
290 break;
291 case offsetof(struct user_regs_struct,ds):
292 task->thread.ds = value;
293 if (task == current)
294 loadsegment(ds, task->thread.ds);
295 break;
296 case offsetof(struct user_regs_struct,es):
297 task->thread.es = value;
298 if (task == current)
299 loadsegment(es, task->thread.es);
300 break;
301
302 /*
303 * Can't actually change these in 64-bit mode.
304 */
305 case offsetof(struct user_regs_struct,cs):
306 if (unlikely(value == 0))
307 return -EIO;
308 task_pt_regs(task)->cs = value;
309 break;
310 case offsetof(struct user_regs_struct,ss):
311 if (unlikely(value == 0))
312 return -EIO;
313 task_pt_regs(task)->ss = value;
314 break;
315 }
316
317 return 0;
318}
319
320#endif /* CONFIG_X86_32 */
321
322static unsigned long get_flags(struct task_struct *task)
323{
324 unsigned long retval = task_pt_regs(task)->flags;
325
326 /*
327 * If the debugger set TF, hide it from the readout.
328 */
329 if (test_tsk_thread_flag(task, TIF_FORCED_TF))
330 retval &= ~X86_EFLAGS_TF;
331
332 return retval;
333}
334
335static int set_flags(struct task_struct *task, unsigned long value)
336{
337 struct pt_regs *regs = task_pt_regs(task);
338
339 /*
340 * If the user value contains TF, mark that
341 * it was not "us" (the debugger) that set it.
342 * If not, make sure it stays set if we had.
343 */
344 if (value & X86_EFLAGS_TF)
345 clear_tsk_thread_flag(task, TIF_FORCED_TF);
346 else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
347 value |= X86_EFLAGS_TF;
348
349 regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
350
351 return 0;
352}
353
354static int putreg(struct task_struct *child,
355 unsigned long offset, unsigned long value)
356{
357 switch (offset) {
358 case offsetof(struct user_regs_struct, cs):
359 case offsetof(struct user_regs_struct, ds):
360 case offsetof(struct user_regs_struct, es):
361 case offsetof(struct user_regs_struct, fs):
362 case offsetof(struct user_regs_struct, gs):
363 case offsetof(struct user_regs_struct, ss):
364 return set_segment_reg(child, offset, value);
365
366 case offsetof(struct user_regs_struct, flags):
367 return set_flags(child, value);
368
369#ifdef CONFIG_X86_64
370 case offsetof(struct user_regs_struct,fs_base):
371 if (value >= TASK_SIZE_MAX)
372 return -EIO;
373 /*
374 * When changing the FS base, use do_arch_prctl_64()
375 * to set the index to zero and to set the base
376 * as requested.
377 */
378 if (child->thread.fsbase != value)
379 return do_arch_prctl_64(child, ARCH_SET_FS, value);
380 return 0;
381 case offsetof(struct user_regs_struct,gs_base):
382 /*
383 * Exactly the same here as the %fs handling above.
384 */
385 if (value >= TASK_SIZE_MAX)
386 return -EIO;
387 if (child->thread.gsbase != value)
388 return do_arch_prctl_64(child, ARCH_SET_GS, value);
389 return 0;
390#endif
391 }
392
393 *pt_regs_access(task_pt_regs(child), offset) = value;
394 return 0;
395}
396
397static unsigned long getreg(struct task_struct *task, unsigned long offset)
398{
399 switch (offset) {
400 case offsetof(struct user_regs_struct, cs):
401 case offsetof(struct user_regs_struct, ds):
402 case offsetof(struct user_regs_struct, es):
403 case offsetof(struct user_regs_struct, fs):
404 case offsetof(struct user_regs_struct, gs):
405 case offsetof(struct user_regs_struct, ss):
406 return get_segment_reg(task, offset);
407
408 case offsetof(struct user_regs_struct, flags):
409 return get_flags(task);
410
411#ifdef CONFIG_X86_64
412 case offsetof(struct user_regs_struct, fs_base):
413 return x86_fsbase_read_task(task);
414 case offsetof(struct user_regs_struct, gs_base):
415 return x86_gsbase_read_task(task);
416#endif
417 }
418
419 return *pt_regs_access(task_pt_regs(task), offset);
420}
421
422static int genregs_get(struct task_struct *target,
423 const struct user_regset *regset,
424 unsigned int pos, unsigned int count,
425 void *kbuf, void __user *ubuf)
426{
427 if (kbuf) {
428 unsigned long *k = kbuf;
429 while (count >= sizeof(*k)) {
430 *k++ = getreg(target, pos);
431 count -= sizeof(*k);
432 pos += sizeof(*k);
433 }
434 } else {
435 unsigned long __user *u = ubuf;
436 while (count >= sizeof(*u)) {
437 if (__put_user(getreg(target, pos), u++))
438 return -EFAULT;
439 count -= sizeof(*u);
440 pos += sizeof(*u);
441 }
442 }
443
444 return 0;
445}
446
447static int genregs_set(struct task_struct *target,
448 const struct user_regset *regset,
449 unsigned int pos, unsigned int count,
450 const void *kbuf, const void __user *ubuf)
451{
452 int ret = 0;
453 if (kbuf) {
454 const unsigned long *k = kbuf;
455 while (count >= sizeof(*k) && !ret) {
456 ret = putreg(target, pos, *k++);
457 count -= sizeof(*k);
458 pos += sizeof(*k);
459 }
460 } else {
461 const unsigned long __user *u = ubuf;
462 while (count >= sizeof(*u) && !ret) {
463 unsigned long word;
464 ret = __get_user(word, u++);
465 if (ret)
466 break;
467 ret = putreg(target, pos, word);
468 count -= sizeof(*u);
469 pos += sizeof(*u);
470 }
471 }
472 return ret;
473}
474
475static void ptrace_triggered(struct perf_event *bp,
476 struct perf_sample_data *data,
477 struct pt_regs *regs)
478{
479 int i;
480 struct thread_struct *thread = &(current->thread);
481
482 /*
483 * Store in the virtual DR6 register the fact that the breakpoint
484 * was hit so the thread's debugger will see it.
485 */
486 for (i = 0; i < HBP_NUM; i++) {
487 if (thread->ptrace_bps[i] == bp)
488 break;
489 }
490
491 thread->debugreg6 |= (DR_TRAP0 << i);
492}
493
494/*
495 * Walk through every ptrace breakpoints for this thread and
496 * build the dr7 value on top of their attributes.
497 *
498 */
499static unsigned long ptrace_get_dr7(struct perf_event *bp[])
500{
501 int i;
502 int dr7 = 0;
503 struct arch_hw_breakpoint *info;
504
505 for (i = 0; i < HBP_NUM; i++) {
506 if (bp[i] && !bp[i]->attr.disabled) {
507 info = counter_arch_bp(bp[i]);
508 dr7 |= encode_dr7(i, info->len, info->type);
509 }
510 }
511
512 return dr7;
513}
514
515static int ptrace_fill_bp_fields(struct perf_event_attr *attr,
516 int len, int type, bool disabled)
517{
518 int err, bp_len, bp_type;
519
520 err = arch_bp_generic_fields(len, type, &bp_len, &bp_type);
521 if (!err) {
522 attr->bp_len = bp_len;
523 attr->bp_type = bp_type;
524 attr->disabled = disabled;
525 }
526
527 return err;
528}
529
530static struct perf_event *
531ptrace_register_breakpoint(struct task_struct *tsk, int len, int type,
532 unsigned long addr, bool disabled)
533{
534 struct perf_event_attr attr;
535 int err;
536
537 ptrace_breakpoint_init(&attr);
538 attr.bp_addr = addr;
539
540 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
541 if (err)
542 return ERR_PTR(err);
543
544 return register_user_hw_breakpoint(&attr, ptrace_triggered,
545 NULL, tsk);
546}
547
548static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type,
549 int disabled)
550{
551 struct perf_event_attr attr = bp->attr;
552 int err;
553
554 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
555 if (err)
556 return err;
557
558 return modify_user_hw_breakpoint(bp, &attr);
559}
560
561/*
562 * Handle ptrace writes to debug register 7.
563 */
564static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data)
565{
566 struct thread_struct *thread = &tsk->thread;
567 unsigned long old_dr7;
568 bool second_pass = false;
569 int i, rc, ret = 0;
570
571 data &= ~DR_CONTROL_RESERVED;
572 old_dr7 = ptrace_get_dr7(thread->ptrace_bps);
573
574restore:
575 rc = 0;
576 for (i = 0; i < HBP_NUM; i++) {
577 unsigned len, type;
578 bool disabled = !decode_dr7(data, i, &len, &type);
579 struct perf_event *bp = thread->ptrace_bps[i];
580
581 if (!bp) {
582 if (disabled)
583 continue;
584
585 bp = ptrace_register_breakpoint(tsk,
586 len, type, 0, disabled);
587 if (IS_ERR(bp)) {
588 rc = PTR_ERR(bp);
589 break;
590 }
591
592 thread->ptrace_bps[i] = bp;
593 continue;
594 }
595
596 rc = ptrace_modify_breakpoint(bp, len, type, disabled);
597 if (rc)
598 break;
599 }
600
601 /* Restore if the first pass failed, second_pass shouldn't fail. */
602 if (rc && !WARN_ON(second_pass)) {
603 ret = rc;
604 data = old_dr7;
605 second_pass = true;
606 goto restore;
607 }
608
609 return ret;
610}
611
612/*
613 * Handle PTRACE_PEEKUSR calls for the debug register area.
614 */
615static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
616{
617 struct thread_struct *thread = &tsk->thread;
618 unsigned long val = 0;
619
620 if (n < HBP_NUM) {
621 int index = array_index_nospec(n, HBP_NUM);
622 struct perf_event *bp = thread->ptrace_bps[index];
623
624 if (bp)
625 val = bp->hw.info.address;
626 } else if (n == 6) {
627 val = thread->debugreg6;
628 } else if (n == 7) {
629 val = thread->ptrace_dr7;
630 }
631 return val;
632}
633
634static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr,
635 unsigned long addr)
636{
637 struct thread_struct *t = &tsk->thread;
638 struct perf_event *bp = t->ptrace_bps[nr];
639 int err = 0;
640
641 if (!bp) {
642 /*
643 * Put stub len and type to create an inactive but correct bp.
644 *
645 * CHECKME: the previous code returned -EIO if the addr wasn't
646 * a valid task virtual addr. The new one will return -EINVAL in
647 * this case.
648 * -EINVAL may be what we want for in-kernel breakpoints users,
649 * but -EIO looks better for ptrace, since we refuse a register
650 * writing for the user. And anyway this is the previous
651 * behaviour.
652 */
653 bp = ptrace_register_breakpoint(tsk,
654 X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE,
655 addr, true);
656 if (IS_ERR(bp))
657 err = PTR_ERR(bp);
658 else
659 t->ptrace_bps[nr] = bp;
660 } else {
661 struct perf_event_attr attr = bp->attr;
662
663 attr.bp_addr = addr;
664 err = modify_user_hw_breakpoint(bp, &attr);
665 }
666
667 return err;
668}
669
670/*
671 * Handle PTRACE_POKEUSR calls for the debug register area.
672 */
673static int ptrace_set_debugreg(struct task_struct *tsk, int n,
674 unsigned long val)
675{
676 struct thread_struct *thread = &tsk->thread;
677 /* There are no DR4 or DR5 registers */
678 int rc = -EIO;
679
680 if (n < HBP_NUM) {
681 rc = ptrace_set_breakpoint_addr(tsk, n, val);
682 } else if (n == 6) {
683 thread->debugreg6 = val;
684 rc = 0;
685 } else if (n == 7) {
686 rc = ptrace_write_dr7(tsk, val);
687 if (!rc)
688 thread->ptrace_dr7 = val;
689 }
690 return rc;
691}
692
693/*
694 * These access the current or another (stopped) task's io permission
695 * bitmap for debugging or core dump.
696 */
697static int ioperm_active(struct task_struct *target,
698 const struct user_regset *regset)
699{
700 return target->thread.io_bitmap_max / regset->size;
701}
702
703static int ioperm_get(struct task_struct *target,
704 const struct user_regset *regset,
705 unsigned int pos, unsigned int count,
706 void *kbuf, void __user *ubuf)
707{
708 if (!target->thread.io_bitmap_ptr)
709 return -ENXIO;
710
711 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
712 target->thread.io_bitmap_ptr,
713 0, IO_BITMAP_BYTES);
714}
715
716/*
717 * Called by kernel/ptrace.c when detaching..
718 *
719 * Make sure the single step bit is not set.
720 */
721void ptrace_disable(struct task_struct *child)
722{
723 user_disable_single_step(child);
724}
725
726#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
727static const struct user_regset_view user_x86_32_view; /* Initialized below. */
728#endif
729
730long arch_ptrace(struct task_struct *child, long request,
731 unsigned long addr, unsigned long data)
732{
733 int ret;
734 unsigned long __user *datap = (unsigned long __user *)data;
735
736 switch (request) {
737 /* read the word at location addr in the USER area. */
738 case PTRACE_PEEKUSR: {
739 unsigned long tmp;
740
741 ret = -EIO;
742 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
743 break;
744
745 tmp = 0; /* Default return condition */
746 if (addr < sizeof(struct user_regs_struct))
747 tmp = getreg(child, addr);
748 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
749 addr <= offsetof(struct user, u_debugreg[7])) {
750 addr -= offsetof(struct user, u_debugreg[0]);
751 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
752 }
753 ret = put_user(tmp, datap);
754 break;
755 }
756
757 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
758 ret = -EIO;
759 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
760 break;
761
762 if (addr < sizeof(struct user_regs_struct))
763 ret = putreg(child, addr, data);
764 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
765 addr <= offsetof(struct user, u_debugreg[7])) {
766 addr -= offsetof(struct user, u_debugreg[0]);
767 ret = ptrace_set_debugreg(child,
768 addr / sizeof(data), data);
769 }
770 break;
771
772 case PTRACE_GETREGS: /* Get all gp regs from the child. */
773 return copy_regset_to_user(child,
774 task_user_regset_view(current),
775 REGSET_GENERAL,
776 0, sizeof(struct user_regs_struct),
777 datap);
778
779 case PTRACE_SETREGS: /* Set all gp regs in the child. */
780 return copy_regset_from_user(child,
781 task_user_regset_view(current),
782 REGSET_GENERAL,
783 0, sizeof(struct user_regs_struct),
784 datap);
785
786 case PTRACE_GETFPREGS: /* Get the child FPU state. */
787 return copy_regset_to_user(child,
788 task_user_regset_view(current),
789 REGSET_FP,
790 0, sizeof(struct user_i387_struct),
791 datap);
792
793 case PTRACE_SETFPREGS: /* Set the child FPU state. */
794 return copy_regset_from_user(child,
795 task_user_regset_view(current),
796 REGSET_FP,
797 0, sizeof(struct user_i387_struct),
798 datap);
799
800#ifdef CONFIG_X86_32
801 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
802 return copy_regset_to_user(child, &user_x86_32_view,
803 REGSET_XFP,
804 0, sizeof(struct user_fxsr_struct),
805 datap) ? -EIO : 0;
806
807 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
808 return copy_regset_from_user(child, &user_x86_32_view,
809 REGSET_XFP,
810 0, sizeof(struct user_fxsr_struct),
811 datap) ? -EIO : 0;
812#endif
813
814#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
815 case PTRACE_GET_THREAD_AREA:
816 if ((int) addr < 0)
817 return -EIO;
818 ret = do_get_thread_area(child, addr,
819 (struct user_desc __user *)data);
820 break;
821
822 case PTRACE_SET_THREAD_AREA:
823 if ((int) addr < 0)
824 return -EIO;
825 ret = do_set_thread_area(child, addr,
826 (struct user_desc __user *)data, 0);
827 break;
828#endif
829
830#ifdef CONFIG_X86_64
831 /* normal 64bit interface to access TLS data.
832 Works just like arch_prctl, except that the arguments
833 are reversed. */
834 case PTRACE_ARCH_PRCTL:
835 ret = do_arch_prctl_64(child, data, addr);
836 break;
837#endif
838
839 default:
840 ret = ptrace_request(child, request, addr, data);
841 break;
842 }
843
844 return ret;
845}
846
847#ifdef CONFIG_IA32_EMULATION
848
849#include <linux/compat.h>
850#include <linux/syscalls.h>
851#include <asm/ia32.h>
852#include <asm/user32.h>
853
854#define R32(l,q) \
855 case offsetof(struct user32, regs.l): \
856 regs->q = value; break
857
858#define SEG32(rs) \
859 case offsetof(struct user32, regs.rs): \
860 return set_segment_reg(child, \
861 offsetof(struct user_regs_struct, rs), \
862 value); \
863 break
864
865static int putreg32(struct task_struct *child, unsigned regno, u32 value)
866{
867 struct pt_regs *regs = task_pt_regs(child);
868
869 switch (regno) {
870
871 SEG32(cs);
872 SEG32(ds);
873 SEG32(es);
874 SEG32(fs);
875 SEG32(gs);
876 SEG32(ss);
877
878 R32(ebx, bx);
879 R32(ecx, cx);
880 R32(edx, dx);
881 R32(edi, di);
882 R32(esi, si);
883 R32(ebp, bp);
884 R32(eax, ax);
885 R32(eip, ip);
886 R32(esp, sp);
887
888 case offsetof(struct user32, regs.orig_eax):
889 /*
890 * Warning: bizarre corner case fixup here. A 32-bit
891 * debugger setting orig_eax to -1 wants to disable
892 * syscall restart. Make sure that the syscall
893 * restart code sign-extends orig_ax. Also make sure
894 * we interpret the -ERESTART* codes correctly if
895 * loaded into regs->ax in case the task is not
896 * actually still sitting at the exit from a 32-bit
897 * syscall with TS_COMPAT still set.
898 */
899 regs->orig_ax = value;
900 if (syscall_get_nr(child, regs) >= 0)
901 child->thread_info.status |= TS_I386_REGS_POKED;
902 break;
903
904 case offsetof(struct user32, regs.eflags):
905 return set_flags(child, value);
906
907 case offsetof(struct user32, u_debugreg[0]) ...
908 offsetof(struct user32, u_debugreg[7]):
909 regno -= offsetof(struct user32, u_debugreg[0]);
910 return ptrace_set_debugreg(child, regno / 4, value);
911
912 default:
913 if (regno > sizeof(struct user32) || (regno & 3))
914 return -EIO;
915
916 /*
917 * Other dummy fields in the virtual user structure
918 * are ignored
919 */
920 break;
921 }
922 return 0;
923}
924
925#undef R32
926#undef SEG32
927
928#define R32(l,q) \
929 case offsetof(struct user32, regs.l): \
930 *val = regs->q; break
931
932#define SEG32(rs) \
933 case offsetof(struct user32, regs.rs): \
934 *val = get_segment_reg(child, \
935 offsetof(struct user_regs_struct, rs)); \
936 break
937
938static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
939{
940 struct pt_regs *regs = task_pt_regs(child);
941
942 switch (regno) {
943
944 SEG32(ds);
945 SEG32(es);
946 SEG32(fs);
947 SEG32(gs);
948
949 R32(cs, cs);
950 R32(ss, ss);
951 R32(ebx, bx);
952 R32(ecx, cx);
953 R32(edx, dx);
954 R32(edi, di);
955 R32(esi, si);
956 R32(ebp, bp);
957 R32(eax, ax);
958 R32(orig_eax, orig_ax);
959 R32(eip, ip);
960 R32(esp, sp);
961
962 case offsetof(struct user32, regs.eflags):
963 *val = get_flags(child);
964 break;
965
966 case offsetof(struct user32, u_debugreg[0]) ...
967 offsetof(struct user32, u_debugreg[7]):
968 regno -= offsetof(struct user32, u_debugreg[0]);
969 *val = ptrace_get_debugreg(child, regno / 4);
970 break;
971
972 default:
973 if (regno > sizeof(struct user32) || (regno & 3))
974 return -EIO;
975
976 /*
977 * Other dummy fields in the virtual user structure
978 * are ignored
979 */
980 *val = 0;
981 break;
982 }
983 return 0;
984}
985
986#undef R32
987#undef SEG32
988
989static int genregs32_get(struct task_struct *target,
990 const struct user_regset *regset,
991 unsigned int pos, unsigned int count,
992 void *kbuf, void __user *ubuf)
993{
994 if (kbuf) {
995 compat_ulong_t *k = kbuf;
996 while (count >= sizeof(*k)) {
997 getreg32(target, pos, k++);
998 count -= sizeof(*k);
999 pos += sizeof(*k);
1000 }
1001 } else {
1002 compat_ulong_t __user *u = ubuf;
1003 while (count >= sizeof(*u)) {
1004 compat_ulong_t word;
1005 getreg32(target, pos, &word);
1006 if (__put_user(word, u++))
1007 return -EFAULT;
1008 count -= sizeof(*u);
1009 pos += sizeof(*u);
1010 }
1011 }
1012
1013 return 0;
1014}
1015
1016static int genregs32_set(struct task_struct *target,
1017 const struct user_regset *regset,
1018 unsigned int pos, unsigned int count,
1019 const void *kbuf, const void __user *ubuf)
1020{
1021 int ret = 0;
1022 if (kbuf) {
1023 const compat_ulong_t *k = kbuf;
1024 while (count >= sizeof(*k) && !ret) {
1025 ret = putreg32(target, pos, *k++);
1026 count -= sizeof(*k);
1027 pos += sizeof(*k);
1028 }
1029 } else {
1030 const compat_ulong_t __user *u = ubuf;
1031 while (count >= sizeof(*u) && !ret) {
1032 compat_ulong_t word;
1033 ret = __get_user(word, u++);
1034 if (ret)
1035 break;
1036 ret = putreg32(target, pos, word);
1037 count -= sizeof(*u);
1038 pos += sizeof(*u);
1039 }
1040 }
1041 return ret;
1042}
1043
1044static long ia32_arch_ptrace(struct task_struct *child, compat_long_t request,
1045 compat_ulong_t caddr, compat_ulong_t cdata)
1046{
1047 unsigned long addr = caddr;
1048 unsigned long data = cdata;
1049 void __user *datap = compat_ptr(data);
1050 int ret;
1051 __u32 val;
1052
1053 switch (request) {
1054 case PTRACE_PEEKUSR:
1055 ret = getreg32(child, addr, &val);
1056 if (ret == 0)
1057 ret = put_user(val, (__u32 __user *)datap);
1058 break;
1059
1060 case PTRACE_POKEUSR:
1061 ret = putreg32(child, addr, data);
1062 break;
1063
1064 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1065 return copy_regset_to_user(child, &user_x86_32_view,
1066 REGSET_GENERAL,
1067 0, sizeof(struct user_regs_struct32),
1068 datap);
1069
1070 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1071 return copy_regset_from_user(child, &user_x86_32_view,
1072 REGSET_GENERAL, 0,
1073 sizeof(struct user_regs_struct32),
1074 datap);
1075
1076 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1077 return copy_regset_to_user(child, &user_x86_32_view,
1078 REGSET_FP, 0,
1079 sizeof(struct user_i387_ia32_struct),
1080 datap);
1081
1082 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1083 return copy_regset_from_user(
1084 child, &user_x86_32_view, REGSET_FP,
1085 0, sizeof(struct user_i387_ia32_struct), datap);
1086
1087 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1088 return copy_regset_to_user(child, &user_x86_32_view,
1089 REGSET_XFP, 0,
1090 sizeof(struct user32_fxsr_struct),
1091 datap);
1092
1093 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1094 return copy_regset_from_user(child, &user_x86_32_view,
1095 REGSET_XFP, 0,
1096 sizeof(struct user32_fxsr_struct),
1097 datap);
1098
1099 case PTRACE_GET_THREAD_AREA:
1100 case PTRACE_SET_THREAD_AREA:
1101 return arch_ptrace(child, request, addr, data);
1102
1103 default:
1104 return compat_ptrace_request(child, request, addr, data);
1105 }
1106
1107 return ret;
1108}
1109#endif /* CONFIG_IA32_EMULATION */
1110
1111#ifdef CONFIG_X86_X32_ABI
1112static long x32_arch_ptrace(struct task_struct *child,
1113 compat_long_t request, compat_ulong_t caddr,
1114 compat_ulong_t cdata)
1115{
1116 unsigned long addr = caddr;
1117 unsigned long data = cdata;
1118 void __user *datap = compat_ptr(data);
1119 int ret;
1120
1121 switch (request) {
1122 /* Read 32bits at location addr in the USER area. Only allow
1123 to return the lower 32bits of segment and debug registers. */
1124 case PTRACE_PEEKUSR: {
1125 u32 tmp;
1126
1127 ret = -EIO;
1128 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1129 addr < offsetof(struct user_regs_struct, cs))
1130 break;
1131
1132 tmp = 0; /* Default return condition */
1133 if (addr < sizeof(struct user_regs_struct))
1134 tmp = getreg(child, addr);
1135 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1136 addr <= offsetof(struct user, u_debugreg[7])) {
1137 addr -= offsetof(struct user, u_debugreg[0]);
1138 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
1139 }
1140 ret = put_user(tmp, (__u32 __user *)datap);
1141 break;
1142 }
1143
1144 /* Write the word at location addr in the USER area. Only allow
1145 to update segment and debug registers with the upper 32bits
1146 zero-extended. */
1147 case PTRACE_POKEUSR:
1148 ret = -EIO;
1149 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1150 addr < offsetof(struct user_regs_struct, cs))
1151 break;
1152
1153 if (addr < sizeof(struct user_regs_struct))
1154 ret = putreg(child, addr, data);
1155 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1156 addr <= offsetof(struct user, u_debugreg[7])) {
1157 addr -= offsetof(struct user, u_debugreg[0]);
1158 ret = ptrace_set_debugreg(child,
1159 addr / sizeof(data), data);
1160 }
1161 break;
1162
1163 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1164 return copy_regset_to_user(child,
1165 task_user_regset_view(current),
1166 REGSET_GENERAL,
1167 0, sizeof(struct user_regs_struct),
1168 datap);
1169
1170 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1171 return copy_regset_from_user(child,
1172 task_user_regset_view(current),
1173 REGSET_GENERAL,
1174 0, sizeof(struct user_regs_struct),
1175 datap);
1176
1177 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1178 return copy_regset_to_user(child,
1179 task_user_regset_view(current),
1180 REGSET_FP,
1181 0, sizeof(struct user_i387_struct),
1182 datap);
1183
1184 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1185 return copy_regset_from_user(child,
1186 task_user_regset_view(current),
1187 REGSET_FP,
1188 0, sizeof(struct user_i387_struct),
1189 datap);
1190
1191 default:
1192 return compat_ptrace_request(child, request, addr, data);
1193 }
1194
1195 return ret;
1196}
1197#endif
1198
1199#ifdef CONFIG_COMPAT
1200long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1201 compat_ulong_t caddr, compat_ulong_t cdata)
1202{
1203#ifdef CONFIG_X86_X32_ABI
1204 if (!in_ia32_syscall())
1205 return x32_arch_ptrace(child, request, caddr, cdata);
1206#endif
1207#ifdef CONFIG_IA32_EMULATION
1208 return ia32_arch_ptrace(child, request, caddr, cdata);
1209#else
1210 return 0;
1211#endif
1212}
1213#endif /* CONFIG_COMPAT */
1214
1215#ifdef CONFIG_X86_64
1216
1217static struct user_regset x86_64_regsets[] __ro_after_init = {
1218 [REGSET_GENERAL] = {
1219 .core_note_type = NT_PRSTATUS,
1220 .n = sizeof(struct user_regs_struct) / sizeof(long),
1221 .size = sizeof(long), .align = sizeof(long),
1222 .get = genregs_get, .set = genregs_set
1223 },
1224 [REGSET_FP] = {
1225 .core_note_type = NT_PRFPREG,
1226 .n = sizeof(struct user_i387_struct) / sizeof(long),
1227 .size = sizeof(long), .align = sizeof(long),
1228 .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set
1229 },
1230 [REGSET_XSTATE] = {
1231 .core_note_type = NT_X86_XSTATE,
1232 .size = sizeof(u64), .align = sizeof(u64),
1233 .active = xstateregs_active, .get = xstateregs_get,
1234 .set = xstateregs_set
1235 },
1236 [REGSET_IOPERM64] = {
1237 .core_note_type = NT_386_IOPERM,
1238 .n = IO_BITMAP_LONGS,
1239 .size = sizeof(long), .align = sizeof(long),
1240 .active = ioperm_active, .get = ioperm_get
1241 },
1242};
1243
1244static const struct user_regset_view user_x86_64_view = {
1245 .name = "x86_64", .e_machine = EM_X86_64,
1246 .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1247};
1248
1249#else /* CONFIG_X86_32 */
1250
1251#define user_regs_struct32 user_regs_struct
1252#define genregs32_get genregs_get
1253#define genregs32_set genregs_set
1254
1255#endif /* CONFIG_X86_64 */
1256
1257#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1258static struct user_regset x86_32_regsets[] __ro_after_init = {
1259 [REGSET_GENERAL] = {
1260 .core_note_type = NT_PRSTATUS,
1261 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1262 .size = sizeof(u32), .align = sizeof(u32),
1263 .get = genregs32_get, .set = genregs32_set
1264 },
1265 [REGSET_FP] = {
1266 .core_note_type = NT_PRFPREG,
1267 .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32),
1268 .size = sizeof(u32), .align = sizeof(u32),
1269 .active = regset_fpregs_active, .get = fpregs_get, .set = fpregs_set
1270 },
1271 [REGSET_XFP] = {
1272 .core_note_type = NT_PRXFPREG,
1273 .n = sizeof(struct user32_fxsr_struct) / sizeof(u32),
1274 .size = sizeof(u32), .align = sizeof(u32),
1275 .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set
1276 },
1277 [REGSET_XSTATE] = {
1278 .core_note_type = NT_X86_XSTATE,
1279 .size = sizeof(u64), .align = sizeof(u64),
1280 .active = xstateregs_active, .get = xstateregs_get,
1281 .set = xstateregs_set
1282 },
1283 [REGSET_TLS] = {
1284 .core_note_type = NT_386_TLS,
1285 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1286 .size = sizeof(struct user_desc),
1287 .align = sizeof(struct user_desc),
1288 .active = regset_tls_active,
1289 .get = regset_tls_get, .set = regset_tls_set
1290 },
1291 [REGSET_IOPERM32] = {
1292 .core_note_type = NT_386_IOPERM,
1293 .n = IO_BITMAP_BYTES / sizeof(u32),
1294 .size = sizeof(u32), .align = sizeof(u32),
1295 .active = ioperm_active, .get = ioperm_get
1296 },
1297};
1298
1299static const struct user_regset_view user_x86_32_view = {
1300 .name = "i386", .e_machine = EM_386,
1301 .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1302};
1303#endif
1304
1305/*
1306 * This represents bytes 464..511 in the memory layout exported through
1307 * the REGSET_XSTATE interface.
1308 */
1309u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
1310
1311void __init update_regset_xstate_info(unsigned int size, u64 xstate_mask)
1312{
1313#ifdef CONFIG_X86_64
1314 x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1315#endif
1316#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1317 x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1318#endif
1319 xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask;
1320}
1321
1322const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1323{
1324#ifdef CONFIG_IA32_EMULATION
1325 if (!user_64bit_mode(task_pt_regs(task)))
1326#endif
1327#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1328 return &user_x86_32_view;
1329#endif
1330#ifdef CONFIG_X86_64
1331 return &user_x86_64_view;
1332#endif
1333}
1334
1335void send_sigtrap(struct pt_regs *regs, int error_code, int si_code)
1336{
1337 struct task_struct *tsk = current;
1338
1339 tsk->thread.trap_nr = X86_TRAP_DB;
1340 tsk->thread.error_code = error_code;
1341
1342 /* Send us the fake SIGTRAP */
1343 force_sig_fault(SIGTRAP, si_code,
1344 user_mode(regs) ? (void __user *)regs->ip : NULL);
1345}
1346
1347void user_single_step_report(struct pt_regs *regs)
1348{
1349 send_sigtrap(regs, 0, TRAP_BRKPT);
1350}
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
27#include <asm/uaccess.h>
28#include <asm/pgtable.h>
29#include <asm/processor.h>
30#include <asm/fpu/internal.h>
31#include <asm/fpu/signal.h>
32#include <asm/fpu/regset.h>
33#include <asm/debugreg.h>
34#include <asm/ldt.h>
35#include <asm/desc.h>
36#include <asm/prctl.h>
37#include <asm/proto.h>
38#include <asm/hw_breakpoint.h>
39#include <asm/traps.h>
40#include <asm/syscall.h>
41
42#include "tls.h"
43
44enum x86_regset {
45 REGSET_GENERAL,
46 REGSET_FP,
47 REGSET_XFP,
48 REGSET_IOPERM64 = REGSET_XFP,
49 REGSET_XSTATE,
50 REGSET_TLS,
51 REGSET_IOPERM32,
52};
53
54struct pt_regs_offset {
55 const char *name;
56 int offset;
57};
58
59#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
60#define REG_OFFSET_END {.name = NULL, .offset = 0}
61
62static const struct pt_regs_offset regoffset_table[] = {
63#ifdef CONFIG_X86_64
64 REG_OFFSET_NAME(r15),
65 REG_OFFSET_NAME(r14),
66 REG_OFFSET_NAME(r13),
67 REG_OFFSET_NAME(r12),
68 REG_OFFSET_NAME(r11),
69 REG_OFFSET_NAME(r10),
70 REG_OFFSET_NAME(r9),
71 REG_OFFSET_NAME(r8),
72#endif
73 REG_OFFSET_NAME(bx),
74 REG_OFFSET_NAME(cx),
75 REG_OFFSET_NAME(dx),
76 REG_OFFSET_NAME(si),
77 REG_OFFSET_NAME(di),
78 REG_OFFSET_NAME(bp),
79 REG_OFFSET_NAME(ax),
80#ifdef CONFIG_X86_32
81 REG_OFFSET_NAME(ds),
82 REG_OFFSET_NAME(es),
83 REG_OFFSET_NAME(fs),
84 REG_OFFSET_NAME(gs),
85#endif
86 REG_OFFSET_NAME(orig_ax),
87 REG_OFFSET_NAME(ip),
88 REG_OFFSET_NAME(cs),
89 REG_OFFSET_NAME(flags),
90 REG_OFFSET_NAME(sp),
91 REG_OFFSET_NAME(ss),
92 REG_OFFSET_END,
93};
94
95/**
96 * regs_query_register_offset() - query register offset from its name
97 * @name: the name of a register
98 *
99 * regs_query_register_offset() returns the offset of a register in struct
100 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
101 */
102int regs_query_register_offset(const char *name)
103{
104 const struct pt_regs_offset *roff;
105 for (roff = regoffset_table; roff->name != NULL; roff++)
106 if (!strcmp(roff->name, name))
107 return roff->offset;
108 return -EINVAL;
109}
110
111/**
112 * regs_query_register_name() - query register name from its offset
113 * @offset: the offset of a register in struct pt_regs.
114 *
115 * regs_query_register_name() returns the name of a register from its
116 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
117 */
118const char *regs_query_register_name(unsigned int offset)
119{
120 const struct pt_regs_offset *roff;
121 for (roff = regoffset_table; roff->name != NULL; roff++)
122 if (roff->offset == offset)
123 return roff->name;
124 return NULL;
125}
126
127/*
128 * does not yet catch signals sent when the child dies.
129 * in exit.c or in signal.c.
130 */
131
132/*
133 * Determines which flags the user has access to [1 = access, 0 = no access].
134 */
135#define FLAG_MASK_32 ((unsigned long) \
136 (X86_EFLAGS_CF | X86_EFLAGS_PF | \
137 X86_EFLAGS_AF | X86_EFLAGS_ZF | \
138 X86_EFLAGS_SF | X86_EFLAGS_TF | \
139 X86_EFLAGS_DF | X86_EFLAGS_OF | \
140 X86_EFLAGS_RF | X86_EFLAGS_AC))
141
142/*
143 * Determines whether a value may be installed in a segment register.
144 */
145static inline bool invalid_selector(u16 value)
146{
147 return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL);
148}
149
150#ifdef CONFIG_X86_32
151
152#define FLAG_MASK FLAG_MASK_32
153
154/*
155 * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
156 * when it traps. The previous stack will be directly underneath the saved
157 * registers, and 'sp/ss' won't even have been saved. Thus the '®s->sp'.
158 *
159 * Now, if the stack is empty, '®s->sp' is out of range. In this
160 * case we try to take the previous stack. To always return a non-null
161 * stack pointer we fall back to regs as stack if no previous stack
162 * exists.
163 *
164 * This is valid only for kernel mode traps.
165 */
166unsigned long kernel_stack_pointer(struct pt_regs *regs)
167{
168 unsigned long context = (unsigned long)regs & ~(THREAD_SIZE - 1);
169 unsigned long sp = (unsigned long)®s->sp;
170 u32 *prev_esp;
171
172 if (context == (sp & ~(THREAD_SIZE - 1)))
173 return sp;
174
175 prev_esp = (u32 *)(context);
176 if (prev_esp)
177 return (unsigned long)prev_esp;
178
179 return (unsigned long)regs;
180}
181EXPORT_SYMBOL_GPL(kernel_stack_pointer);
182
183static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
184{
185 BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
186 return ®s->bx + (regno >> 2);
187}
188
189static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
190{
191 /*
192 * Returning the value truncates it to 16 bits.
193 */
194 unsigned int retval;
195 if (offset != offsetof(struct user_regs_struct, gs))
196 retval = *pt_regs_access(task_pt_regs(task), offset);
197 else {
198 if (task == current)
199 retval = get_user_gs(task_pt_regs(task));
200 else
201 retval = task_user_gs(task);
202 }
203 return retval;
204}
205
206static int set_segment_reg(struct task_struct *task,
207 unsigned long offset, u16 value)
208{
209 /*
210 * The value argument was already truncated to 16 bits.
211 */
212 if (invalid_selector(value))
213 return -EIO;
214
215 /*
216 * For %cs and %ss we cannot permit a null selector.
217 * We can permit a bogus selector as long as it has USER_RPL.
218 * Null selectors are fine for other segment registers, but
219 * we will never get back to user mode with invalid %cs or %ss
220 * and will take the trap in iret instead. Much code relies
221 * on user_mode() to distinguish a user trap frame (which can
222 * safely use invalid selectors) from a kernel trap frame.
223 */
224 switch (offset) {
225 case offsetof(struct user_regs_struct, cs):
226 case offsetof(struct user_regs_struct, ss):
227 if (unlikely(value == 0))
228 return -EIO;
229
230 default:
231 *pt_regs_access(task_pt_regs(task), offset) = value;
232 break;
233
234 case offsetof(struct user_regs_struct, gs):
235 if (task == current)
236 set_user_gs(task_pt_regs(task), value);
237 else
238 task_user_gs(task) = value;
239 }
240
241 return 0;
242}
243
244#else /* CONFIG_X86_64 */
245
246#define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
247
248static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
249{
250 BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
251 return ®s->r15 + (offset / sizeof(regs->r15));
252}
253
254static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
255{
256 /*
257 * Returning the value truncates it to 16 bits.
258 */
259 unsigned int seg;
260
261 switch (offset) {
262 case offsetof(struct user_regs_struct, fs):
263 if (task == current) {
264 /* Older gas can't assemble movq %?s,%r?? */
265 asm("movl %%fs,%0" : "=r" (seg));
266 return seg;
267 }
268 return task->thread.fsindex;
269 case offsetof(struct user_regs_struct, gs):
270 if (task == current) {
271 asm("movl %%gs,%0" : "=r" (seg));
272 return seg;
273 }
274 return task->thread.gsindex;
275 case offsetof(struct user_regs_struct, ds):
276 if (task == current) {
277 asm("movl %%ds,%0" : "=r" (seg));
278 return seg;
279 }
280 return task->thread.ds;
281 case offsetof(struct user_regs_struct, es):
282 if (task == current) {
283 asm("movl %%es,%0" : "=r" (seg));
284 return seg;
285 }
286 return task->thread.es;
287
288 case offsetof(struct user_regs_struct, cs):
289 case offsetof(struct user_regs_struct, ss):
290 break;
291 }
292 return *pt_regs_access(task_pt_regs(task), offset);
293}
294
295static int set_segment_reg(struct task_struct *task,
296 unsigned long offset, u16 value)
297{
298 /*
299 * The value argument was already truncated to 16 bits.
300 */
301 if (invalid_selector(value))
302 return -EIO;
303
304 switch (offset) {
305 case offsetof(struct user_regs_struct,fs):
306 /*
307 * If this is setting fs as for normal 64-bit use but
308 * setting fs_base has implicitly changed it, leave it.
309 */
310 if ((value == FS_TLS_SEL && task->thread.fsindex == 0 &&
311 task->thread.fs != 0) ||
312 (value == 0 && task->thread.fsindex == FS_TLS_SEL &&
313 task->thread.fs == 0))
314 break;
315 task->thread.fsindex = value;
316 if (task == current)
317 loadsegment(fs, task->thread.fsindex);
318 break;
319 case offsetof(struct user_regs_struct,gs):
320 /*
321 * If this is setting gs as for normal 64-bit use but
322 * setting gs_base has implicitly changed it, leave it.
323 */
324 if ((value == GS_TLS_SEL && task->thread.gsindex == 0 &&
325 task->thread.gs != 0) ||
326 (value == 0 && task->thread.gsindex == GS_TLS_SEL &&
327 task->thread.gs == 0))
328 break;
329 task->thread.gsindex = value;
330 if (task == current)
331 load_gs_index(task->thread.gsindex);
332 break;
333 case offsetof(struct user_regs_struct,ds):
334 task->thread.ds = value;
335 if (task == current)
336 loadsegment(ds, task->thread.ds);
337 break;
338 case offsetof(struct user_regs_struct,es):
339 task->thread.es = value;
340 if (task == current)
341 loadsegment(es, task->thread.es);
342 break;
343
344 /*
345 * Can't actually change these in 64-bit mode.
346 */
347 case offsetof(struct user_regs_struct,cs):
348 if (unlikely(value == 0))
349 return -EIO;
350 task_pt_regs(task)->cs = value;
351 break;
352 case offsetof(struct user_regs_struct,ss):
353 if (unlikely(value == 0))
354 return -EIO;
355 task_pt_regs(task)->ss = value;
356 break;
357 }
358
359 return 0;
360}
361
362#endif /* CONFIG_X86_32 */
363
364static unsigned long get_flags(struct task_struct *task)
365{
366 unsigned long retval = task_pt_regs(task)->flags;
367
368 /*
369 * If the debugger set TF, hide it from the readout.
370 */
371 if (test_tsk_thread_flag(task, TIF_FORCED_TF))
372 retval &= ~X86_EFLAGS_TF;
373
374 return retval;
375}
376
377static int set_flags(struct task_struct *task, unsigned long value)
378{
379 struct pt_regs *regs = task_pt_regs(task);
380
381 /*
382 * If the user value contains TF, mark that
383 * it was not "us" (the debugger) that set it.
384 * If not, make sure it stays set if we had.
385 */
386 if (value & X86_EFLAGS_TF)
387 clear_tsk_thread_flag(task, TIF_FORCED_TF);
388 else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
389 value |= X86_EFLAGS_TF;
390
391 regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
392
393 return 0;
394}
395
396static int putreg(struct task_struct *child,
397 unsigned long offset, unsigned long value)
398{
399 switch (offset) {
400 case offsetof(struct user_regs_struct, cs):
401 case offsetof(struct user_regs_struct, ds):
402 case offsetof(struct user_regs_struct, es):
403 case offsetof(struct user_regs_struct, fs):
404 case offsetof(struct user_regs_struct, gs):
405 case offsetof(struct user_regs_struct, ss):
406 return set_segment_reg(child, offset, value);
407
408 case offsetof(struct user_regs_struct, flags):
409 return set_flags(child, value);
410
411#ifdef CONFIG_X86_64
412 case offsetof(struct user_regs_struct,fs_base):
413 if (value >= TASK_SIZE_OF(child))
414 return -EIO;
415 /*
416 * When changing the segment base, use do_arch_prctl
417 * to set either thread.fs or thread.fsindex and the
418 * corresponding GDT slot.
419 */
420 if (child->thread.fs != value)
421 return do_arch_prctl(child, ARCH_SET_FS, value);
422 return 0;
423 case offsetof(struct user_regs_struct,gs_base):
424 /*
425 * Exactly the same here as the %fs handling above.
426 */
427 if (value >= TASK_SIZE_OF(child))
428 return -EIO;
429 if (child->thread.gs != value)
430 return do_arch_prctl(child, ARCH_SET_GS, value);
431 return 0;
432#endif
433 }
434
435 *pt_regs_access(task_pt_regs(child), offset) = value;
436 return 0;
437}
438
439static unsigned long getreg(struct task_struct *task, unsigned long offset)
440{
441 switch (offset) {
442 case offsetof(struct user_regs_struct, cs):
443 case offsetof(struct user_regs_struct, ds):
444 case offsetof(struct user_regs_struct, es):
445 case offsetof(struct user_regs_struct, fs):
446 case offsetof(struct user_regs_struct, gs):
447 case offsetof(struct user_regs_struct, ss):
448 return get_segment_reg(task, offset);
449
450 case offsetof(struct user_regs_struct, flags):
451 return get_flags(task);
452
453#ifdef CONFIG_X86_64
454 case offsetof(struct user_regs_struct, fs_base): {
455 /*
456 * do_arch_prctl may have used a GDT slot instead of
457 * the MSR. To userland, it appears the same either
458 * way, except the %fs segment selector might not be 0.
459 */
460 unsigned int seg = task->thread.fsindex;
461 if (task->thread.fs != 0)
462 return task->thread.fs;
463 if (task == current)
464 asm("movl %%fs,%0" : "=r" (seg));
465 if (seg != FS_TLS_SEL)
466 return 0;
467 return get_desc_base(&task->thread.tls_array[FS_TLS]);
468 }
469 case offsetof(struct user_regs_struct, gs_base): {
470 /*
471 * Exactly the same here as the %fs handling above.
472 */
473 unsigned int seg = task->thread.gsindex;
474 if (task->thread.gs != 0)
475 return task->thread.gs;
476 if (task == current)
477 asm("movl %%gs,%0" : "=r" (seg));
478 if (seg != GS_TLS_SEL)
479 return 0;
480 return get_desc_base(&task->thread.tls_array[GS_TLS]);
481 }
482#endif
483 }
484
485 return *pt_regs_access(task_pt_regs(task), offset);
486}
487
488static int genregs_get(struct task_struct *target,
489 const struct user_regset *regset,
490 unsigned int pos, unsigned int count,
491 void *kbuf, void __user *ubuf)
492{
493 if (kbuf) {
494 unsigned long *k = kbuf;
495 while (count >= sizeof(*k)) {
496 *k++ = getreg(target, pos);
497 count -= sizeof(*k);
498 pos += sizeof(*k);
499 }
500 } else {
501 unsigned long __user *u = ubuf;
502 while (count >= sizeof(*u)) {
503 if (__put_user(getreg(target, pos), u++))
504 return -EFAULT;
505 count -= sizeof(*u);
506 pos += sizeof(*u);
507 }
508 }
509
510 return 0;
511}
512
513static int genregs_set(struct task_struct *target,
514 const struct user_regset *regset,
515 unsigned int pos, unsigned int count,
516 const void *kbuf, const void __user *ubuf)
517{
518 int ret = 0;
519 if (kbuf) {
520 const unsigned long *k = kbuf;
521 while (count >= sizeof(*k) && !ret) {
522 ret = putreg(target, pos, *k++);
523 count -= sizeof(*k);
524 pos += sizeof(*k);
525 }
526 } else {
527 const unsigned long __user *u = ubuf;
528 while (count >= sizeof(*u) && !ret) {
529 unsigned long word;
530 ret = __get_user(word, u++);
531 if (ret)
532 break;
533 ret = putreg(target, pos, word);
534 count -= sizeof(*u);
535 pos += sizeof(*u);
536 }
537 }
538 return ret;
539}
540
541static void ptrace_triggered(struct perf_event *bp,
542 struct perf_sample_data *data,
543 struct pt_regs *regs)
544{
545 int i;
546 struct thread_struct *thread = &(current->thread);
547
548 /*
549 * Store in the virtual DR6 register the fact that the breakpoint
550 * was hit so the thread's debugger will see it.
551 */
552 for (i = 0; i < HBP_NUM; i++) {
553 if (thread->ptrace_bps[i] == bp)
554 break;
555 }
556
557 thread->debugreg6 |= (DR_TRAP0 << i);
558}
559
560/*
561 * Walk through every ptrace breakpoints for this thread and
562 * build the dr7 value on top of their attributes.
563 *
564 */
565static unsigned long ptrace_get_dr7(struct perf_event *bp[])
566{
567 int i;
568 int dr7 = 0;
569 struct arch_hw_breakpoint *info;
570
571 for (i = 0; i < HBP_NUM; i++) {
572 if (bp[i] && !bp[i]->attr.disabled) {
573 info = counter_arch_bp(bp[i]);
574 dr7 |= encode_dr7(i, info->len, info->type);
575 }
576 }
577
578 return dr7;
579}
580
581static int ptrace_fill_bp_fields(struct perf_event_attr *attr,
582 int len, int type, bool disabled)
583{
584 int err, bp_len, bp_type;
585
586 err = arch_bp_generic_fields(len, type, &bp_len, &bp_type);
587 if (!err) {
588 attr->bp_len = bp_len;
589 attr->bp_type = bp_type;
590 attr->disabled = disabled;
591 }
592
593 return err;
594}
595
596static struct perf_event *
597ptrace_register_breakpoint(struct task_struct *tsk, int len, int type,
598 unsigned long addr, bool disabled)
599{
600 struct perf_event_attr attr;
601 int err;
602
603 ptrace_breakpoint_init(&attr);
604 attr.bp_addr = addr;
605
606 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
607 if (err)
608 return ERR_PTR(err);
609
610 return register_user_hw_breakpoint(&attr, ptrace_triggered,
611 NULL, tsk);
612}
613
614static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type,
615 int disabled)
616{
617 struct perf_event_attr attr = bp->attr;
618 int err;
619
620 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
621 if (err)
622 return err;
623
624 return modify_user_hw_breakpoint(bp, &attr);
625}
626
627/*
628 * Handle ptrace writes to debug register 7.
629 */
630static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data)
631{
632 struct thread_struct *thread = &tsk->thread;
633 unsigned long old_dr7;
634 bool second_pass = false;
635 int i, rc, ret = 0;
636
637 data &= ~DR_CONTROL_RESERVED;
638 old_dr7 = ptrace_get_dr7(thread->ptrace_bps);
639
640restore:
641 rc = 0;
642 for (i = 0; i < HBP_NUM; i++) {
643 unsigned len, type;
644 bool disabled = !decode_dr7(data, i, &len, &type);
645 struct perf_event *bp = thread->ptrace_bps[i];
646
647 if (!bp) {
648 if (disabled)
649 continue;
650
651 bp = ptrace_register_breakpoint(tsk,
652 len, type, 0, disabled);
653 if (IS_ERR(bp)) {
654 rc = PTR_ERR(bp);
655 break;
656 }
657
658 thread->ptrace_bps[i] = bp;
659 continue;
660 }
661
662 rc = ptrace_modify_breakpoint(bp, len, type, disabled);
663 if (rc)
664 break;
665 }
666
667 /* Restore if the first pass failed, second_pass shouldn't fail. */
668 if (rc && !WARN_ON(second_pass)) {
669 ret = rc;
670 data = old_dr7;
671 second_pass = true;
672 goto restore;
673 }
674
675 return ret;
676}
677
678/*
679 * Handle PTRACE_PEEKUSR calls for the debug register area.
680 */
681static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
682{
683 struct thread_struct *thread = &tsk->thread;
684 unsigned long val = 0;
685
686 if (n < HBP_NUM) {
687 struct perf_event *bp = thread->ptrace_bps[n];
688
689 if (bp)
690 val = bp->hw.info.address;
691 } else if (n == 6) {
692 val = thread->debugreg6;
693 } else if (n == 7) {
694 val = thread->ptrace_dr7;
695 }
696 return val;
697}
698
699static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr,
700 unsigned long addr)
701{
702 struct thread_struct *t = &tsk->thread;
703 struct perf_event *bp = t->ptrace_bps[nr];
704 int err = 0;
705
706 if (!bp) {
707 /*
708 * Put stub len and type to create an inactive but correct bp.
709 *
710 * CHECKME: the previous code returned -EIO if the addr wasn't
711 * a valid task virtual addr. The new one will return -EINVAL in
712 * this case.
713 * -EINVAL may be what we want for in-kernel breakpoints users,
714 * but -EIO looks better for ptrace, since we refuse a register
715 * writing for the user. And anyway this is the previous
716 * behaviour.
717 */
718 bp = ptrace_register_breakpoint(tsk,
719 X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE,
720 addr, true);
721 if (IS_ERR(bp))
722 err = PTR_ERR(bp);
723 else
724 t->ptrace_bps[nr] = bp;
725 } else {
726 struct perf_event_attr attr = bp->attr;
727
728 attr.bp_addr = addr;
729 err = modify_user_hw_breakpoint(bp, &attr);
730 }
731
732 return err;
733}
734
735/*
736 * Handle PTRACE_POKEUSR calls for the debug register area.
737 */
738static int ptrace_set_debugreg(struct task_struct *tsk, int n,
739 unsigned long val)
740{
741 struct thread_struct *thread = &tsk->thread;
742 /* There are no DR4 or DR5 registers */
743 int rc = -EIO;
744
745 if (n < HBP_NUM) {
746 rc = ptrace_set_breakpoint_addr(tsk, n, val);
747 } else if (n == 6) {
748 thread->debugreg6 = val;
749 rc = 0;
750 } else if (n == 7) {
751 rc = ptrace_write_dr7(tsk, val);
752 if (!rc)
753 thread->ptrace_dr7 = val;
754 }
755 return rc;
756}
757
758/*
759 * These access the current or another (stopped) task's io permission
760 * bitmap for debugging or core dump.
761 */
762static int ioperm_active(struct task_struct *target,
763 const struct user_regset *regset)
764{
765 return target->thread.io_bitmap_max / regset->size;
766}
767
768static int ioperm_get(struct task_struct *target,
769 const struct user_regset *regset,
770 unsigned int pos, unsigned int count,
771 void *kbuf, void __user *ubuf)
772{
773 if (!target->thread.io_bitmap_ptr)
774 return -ENXIO;
775
776 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
777 target->thread.io_bitmap_ptr,
778 0, IO_BITMAP_BYTES);
779}
780
781/*
782 * Called by kernel/ptrace.c when detaching..
783 *
784 * Make sure the single step bit is not set.
785 */
786void ptrace_disable(struct task_struct *child)
787{
788 user_disable_single_step(child);
789#ifdef TIF_SYSCALL_EMU
790 clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
791#endif
792}
793
794#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
795static const struct user_regset_view user_x86_32_view; /* Initialized below. */
796#endif
797
798long arch_ptrace(struct task_struct *child, long request,
799 unsigned long addr, unsigned long data)
800{
801 int ret;
802 unsigned long __user *datap = (unsigned long __user *)data;
803
804 switch (request) {
805 /* read the word at location addr in the USER area. */
806 case PTRACE_PEEKUSR: {
807 unsigned long tmp;
808
809 ret = -EIO;
810 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
811 break;
812
813 tmp = 0; /* Default return condition */
814 if (addr < sizeof(struct user_regs_struct))
815 tmp = getreg(child, addr);
816 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
817 addr <= offsetof(struct user, u_debugreg[7])) {
818 addr -= offsetof(struct user, u_debugreg[0]);
819 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
820 }
821 ret = put_user(tmp, datap);
822 break;
823 }
824
825 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
826 ret = -EIO;
827 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
828 break;
829
830 if (addr < sizeof(struct user_regs_struct))
831 ret = putreg(child, addr, data);
832 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
833 addr <= offsetof(struct user, u_debugreg[7])) {
834 addr -= offsetof(struct user, u_debugreg[0]);
835 ret = ptrace_set_debugreg(child,
836 addr / sizeof(data), data);
837 }
838 break;
839
840 case PTRACE_GETREGS: /* Get all gp regs from the child. */
841 return copy_regset_to_user(child,
842 task_user_regset_view(current),
843 REGSET_GENERAL,
844 0, sizeof(struct user_regs_struct),
845 datap);
846
847 case PTRACE_SETREGS: /* Set all gp regs in the child. */
848 return copy_regset_from_user(child,
849 task_user_regset_view(current),
850 REGSET_GENERAL,
851 0, sizeof(struct user_regs_struct),
852 datap);
853
854 case PTRACE_GETFPREGS: /* Get the child FPU state. */
855 return copy_regset_to_user(child,
856 task_user_regset_view(current),
857 REGSET_FP,
858 0, sizeof(struct user_i387_struct),
859 datap);
860
861 case PTRACE_SETFPREGS: /* Set the child FPU state. */
862 return copy_regset_from_user(child,
863 task_user_regset_view(current),
864 REGSET_FP,
865 0, sizeof(struct user_i387_struct),
866 datap);
867
868#ifdef CONFIG_X86_32
869 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
870 return copy_regset_to_user(child, &user_x86_32_view,
871 REGSET_XFP,
872 0, sizeof(struct user_fxsr_struct),
873 datap) ? -EIO : 0;
874
875 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
876 return copy_regset_from_user(child, &user_x86_32_view,
877 REGSET_XFP,
878 0, sizeof(struct user_fxsr_struct),
879 datap) ? -EIO : 0;
880#endif
881
882#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
883 case PTRACE_GET_THREAD_AREA:
884 if ((int) addr < 0)
885 return -EIO;
886 ret = do_get_thread_area(child, addr,
887 (struct user_desc __user *)data);
888 break;
889
890 case PTRACE_SET_THREAD_AREA:
891 if ((int) addr < 0)
892 return -EIO;
893 ret = do_set_thread_area(child, addr,
894 (struct user_desc __user *)data, 0);
895 break;
896#endif
897
898#ifdef CONFIG_X86_64
899 /* normal 64bit interface to access TLS data.
900 Works just like arch_prctl, except that the arguments
901 are reversed. */
902 case PTRACE_ARCH_PRCTL:
903 ret = do_arch_prctl(child, data, addr);
904 break;
905#endif
906
907 default:
908 ret = ptrace_request(child, request, addr, data);
909 break;
910 }
911
912 return ret;
913}
914
915#ifdef CONFIG_IA32_EMULATION
916
917#include <linux/compat.h>
918#include <linux/syscalls.h>
919#include <asm/ia32.h>
920#include <asm/user32.h>
921
922#define R32(l,q) \
923 case offsetof(struct user32, regs.l): \
924 regs->q = value; break
925
926#define SEG32(rs) \
927 case offsetof(struct user32, regs.rs): \
928 return set_segment_reg(child, \
929 offsetof(struct user_regs_struct, rs), \
930 value); \
931 break
932
933static int putreg32(struct task_struct *child, unsigned regno, u32 value)
934{
935 struct pt_regs *regs = task_pt_regs(child);
936
937 switch (regno) {
938
939 SEG32(cs);
940 SEG32(ds);
941 SEG32(es);
942 SEG32(fs);
943 SEG32(gs);
944 SEG32(ss);
945
946 R32(ebx, bx);
947 R32(ecx, cx);
948 R32(edx, dx);
949 R32(edi, di);
950 R32(esi, si);
951 R32(ebp, bp);
952 R32(eax, ax);
953 R32(eip, ip);
954 R32(esp, sp);
955
956 case offsetof(struct user32, regs.orig_eax):
957 /*
958 * A 32-bit debugger setting orig_eax means to restore
959 * the state of the task restarting a 32-bit syscall.
960 * Make sure we interpret the -ERESTART* codes correctly
961 * in case the task is not actually still sitting at the
962 * exit from a 32-bit syscall with TS_COMPAT still set.
963 */
964 regs->orig_ax = value;
965 if (syscall_get_nr(child, regs) >= 0)
966 task_thread_info(child)->status |= TS_COMPAT;
967 break;
968
969 case offsetof(struct user32, regs.eflags):
970 return set_flags(child, value);
971
972 case offsetof(struct user32, u_debugreg[0]) ...
973 offsetof(struct user32, u_debugreg[7]):
974 regno -= offsetof(struct user32, u_debugreg[0]);
975 return ptrace_set_debugreg(child, regno / 4, value);
976
977 default:
978 if (regno > sizeof(struct user32) || (regno & 3))
979 return -EIO;
980
981 /*
982 * Other dummy fields in the virtual user structure
983 * are ignored
984 */
985 break;
986 }
987 return 0;
988}
989
990#undef R32
991#undef SEG32
992
993#define R32(l,q) \
994 case offsetof(struct user32, regs.l): \
995 *val = regs->q; break
996
997#define SEG32(rs) \
998 case offsetof(struct user32, regs.rs): \
999 *val = get_segment_reg(child, \
1000 offsetof(struct user_regs_struct, rs)); \
1001 break
1002
1003static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
1004{
1005 struct pt_regs *regs = task_pt_regs(child);
1006
1007 switch (regno) {
1008
1009 SEG32(ds);
1010 SEG32(es);
1011 SEG32(fs);
1012 SEG32(gs);
1013
1014 R32(cs, cs);
1015 R32(ss, ss);
1016 R32(ebx, bx);
1017 R32(ecx, cx);
1018 R32(edx, dx);
1019 R32(edi, di);
1020 R32(esi, si);
1021 R32(ebp, bp);
1022 R32(eax, ax);
1023 R32(orig_eax, orig_ax);
1024 R32(eip, ip);
1025 R32(esp, sp);
1026
1027 case offsetof(struct user32, regs.eflags):
1028 *val = get_flags(child);
1029 break;
1030
1031 case offsetof(struct user32, u_debugreg[0]) ...
1032 offsetof(struct user32, u_debugreg[7]):
1033 regno -= offsetof(struct user32, u_debugreg[0]);
1034 *val = ptrace_get_debugreg(child, regno / 4);
1035 break;
1036
1037 default:
1038 if (regno > sizeof(struct user32) || (regno & 3))
1039 return -EIO;
1040
1041 /*
1042 * Other dummy fields in the virtual user structure
1043 * are ignored
1044 */
1045 *val = 0;
1046 break;
1047 }
1048 return 0;
1049}
1050
1051#undef R32
1052#undef SEG32
1053
1054static int genregs32_get(struct task_struct *target,
1055 const struct user_regset *regset,
1056 unsigned int pos, unsigned int count,
1057 void *kbuf, void __user *ubuf)
1058{
1059 if (kbuf) {
1060 compat_ulong_t *k = kbuf;
1061 while (count >= sizeof(*k)) {
1062 getreg32(target, pos, k++);
1063 count -= sizeof(*k);
1064 pos += sizeof(*k);
1065 }
1066 } else {
1067 compat_ulong_t __user *u = ubuf;
1068 while (count >= sizeof(*u)) {
1069 compat_ulong_t word;
1070 getreg32(target, pos, &word);
1071 if (__put_user(word, u++))
1072 return -EFAULT;
1073 count -= sizeof(*u);
1074 pos += sizeof(*u);
1075 }
1076 }
1077
1078 return 0;
1079}
1080
1081static int genregs32_set(struct task_struct *target,
1082 const struct user_regset *regset,
1083 unsigned int pos, unsigned int count,
1084 const void *kbuf, const void __user *ubuf)
1085{
1086 int ret = 0;
1087 if (kbuf) {
1088 const compat_ulong_t *k = kbuf;
1089 while (count >= sizeof(*k) && !ret) {
1090 ret = putreg32(target, pos, *k++);
1091 count -= sizeof(*k);
1092 pos += sizeof(*k);
1093 }
1094 } else {
1095 const compat_ulong_t __user *u = ubuf;
1096 while (count >= sizeof(*u) && !ret) {
1097 compat_ulong_t word;
1098 ret = __get_user(word, u++);
1099 if (ret)
1100 break;
1101 ret = putreg32(target, pos, word);
1102 count -= sizeof(*u);
1103 pos += sizeof(*u);
1104 }
1105 }
1106 return ret;
1107}
1108
1109static long ia32_arch_ptrace(struct task_struct *child, compat_long_t request,
1110 compat_ulong_t caddr, compat_ulong_t cdata)
1111{
1112 unsigned long addr = caddr;
1113 unsigned long data = cdata;
1114 void __user *datap = compat_ptr(data);
1115 int ret;
1116 __u32 val;
1117
1118 switch (request) {
1119 case PTRACE_PEEKUSR:
1120 ret = getreg32(child, addr, &val);
1121 if (ret == 0)
1122 ret = put_user(val, (__u32 __user *)datap);
1123 break;
1124
1125 case PTRACE_POKEUSR:
1126 ret = putreg32(child, addr, data);
1127 break;
1128
1129 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1130 return copy_regset_to_user(child, &user_x86_32_view,
1131 REGSET_GENERAL,
1132 0, sizeof(struct user_regs_struct32),
1133 datap);
1134
1135 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1136 return copy_regset_from_user(child, &user_x86_32_view,
1137 REGSET_GENERAL, 0,
1138 sizeof(struct user_regs_struct32),
1139 datap);
1140
1141 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1142 return copy_regset_to_user(child, &user_x86_32_view,
1143 REGSET_FP, 0,
1144 sizeof(struct user_i387_ia32_struct),
1145 datap);
1146
1147 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1148 return copy_regset_from_user(
1149 child, &user_x86_32_view, REGSET_FP,
1150 0, sizeof(struct user_i387_ia32_struct), datap);
1151
1152 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1153 return copy_regset_to_user(child, &user_x86_32_view,
1154 REGSET_XFP, 0,
1155 sizeof(struct user32_fxsr_struct),
1156 datap);
1157
1158 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1159 return copy_regset_from_user(child, &user_x86_32_view,
1160 REGSET_XFP, 0,
1161 sizeof(struct user32_fxsr_struct),
1162 datap);
1163
1164 case PTRACE_GET_THREAD_AREA:
1165 case PTRACE_SET_THREAD_AREA:
1166 return arch_ptrace(child, request, addr, data);
1167
1168 default:
1169 return compat_ptrace_request(child, request, addr, data);
1170 }
1171
1172 return ret;
1173}
1174#endif /* CONFIG_IA32_EMULATION */
1175
1176#ifdef CONFIG_X86_X32_ABI
1177static long x32_arch_ptrace(struct task_struct *child,
1178 compat_long_t request, compat_ulong_t caddr,
1179 compat_ulong_t cdata)
1180{
1181 unsigned long addr = caddr;
1182 unsigned long data = cdata;
1183 void __user *datap = compat_ptr(data);
1184 int ret;
1185
1186 switch (request) {
1187 /* Read 32bits at location addr in the USER area. Only allow
1188 to return the lower 32bits of segment and debug registers. */
1189 case PTRACE_PEEKUSR: {
1190 u32 tmp;
1191
1192 ret = -EIO;
1193 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1194 addr < offsetof(struct user_regs_struct, cs))
1195 break;
1196
1197 tmp = 0; /* Default return condition */
1198 if (addr < sizeof(struct user_regs_struct))
1199 tmp = getreg(child, addr);
1200 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1201 addr <= offsetof(struct user, u_debugreg[7])) {
1202 addr -= offsetof(struct user, u_debugreg[0]);
1203 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
1204 }
1205 ret = put_user(tmp, (__u32 __user *)datap);
1206 break;
1207 }
1208
1209 /* Write the word at location addr in the USER area. Only allow
1210 to update segment and debug registers with the upper 32bits
1211 zero-extended. */
1212 case PTRACE_POKEUSR:
1213 ret = -EIO;
1214 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1215 addr < offsetof(struct user_regs_struct, cs))
1216 break;
1217
1218 if (addr < sizeof(struct user_regs_struct))
1219 ret = putreg(child, addr, data);
1220 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1221 addr <= offsetof(struct user, u_debugreg[7])) {
1222 addr -= offsetof(struct user, u_debugreg[0]);
1223 ret = ptrace_set_debugreg(child,
1224 addr / sizeof(data), data);
1225 }
1226 break;
1227
1228 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1229 return copy_regset_to_user(child,
1230 task_user_regset_view(current),
1231 REGSET_GENERAL,
1232 0, sizeof(struct user_regs_struct),
1233 datap);
1234
1235 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1236 return copy_regset_from_user(child,
1237 task_user_regset_view(current),
1238 REGSET_GENERAL,
1239 0, sizeof(struct user_regs_struct),
1240 datap);
1241
1242 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1243 return copy_regset_to_user(child,
1244 task_user_regset_view(current),
1245 REGSET_FP,
1246 0, sizeof(struct user_i387_struct),
1247 datap);
1248
1249 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1250 return copy_regset_from_user(child,
1251 task_user_regset_view(current),
1252 REGSET_FP,
1253 0, sizeof(struct user_i387_struct),
1254 datap);
1255
1256 default:
1257 return compat_ptrace_request(child, request, addr, data);
1258 }
1259
1260 return ret;
1261}
1262#endif
1263
1264#ifdef CONFIG_COMPAT
1265long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1266 compat_ulong_t caddr, compat_ulong_t cdata)
1267{
1268#ifdef CONFIG_X86_X32_ABI
1269 if (!is_ia32_task())
1270 return x32_arch_ptrace(child, request, caddr, cdata);
1271#endif
1272#ifdef CONFIG_IA32_EMULATION
1273 return ia32_arch_ptrace(child, request, caddr, cdata);
1274#else
1275 return 0;
1276#endif
1277}
1278#endif /* CONFIG_COMPAT */
1279
1280#ifdef CONFIG_X86_64
1281
1282static struct user_regset x86_64_regsets[] __read_mostly = {
1283 [REGSET_GENERAL] = {
1284 .core_note_type = NT_PRSTATUS,
1285 .n = sizeof(struct user_regs_struct) / sizeof(long),
1286 .size = sizeof(long), .align = sizeof(long),
1287 .get = genregs_get, .set = genregs_set
1288 },
1289 [REGSET_FP] = {
1290 .core_note_type = NT_PRFPREG,
1291 .n = sizeof(struct user_i387_struct) / sizeof(long),
1292 .size = sizeof(long), .align = sizeof(long),
1293 .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set
1294 },
1295 [REGSET_XSTATE] = {
1296 .core_note_type = NT_X86_XSTATE,
1297 .size = sizeof(u64), .align = sizeof(u64),
1298 .active = xstateregs_active, .get = xstateregs_get,
1299 .set = xstateregs_set
1300 },
1301 [REGSET_IOPERM64] = {
1302 .core_note_type = NT_386_IOPERM,
1303 .n = IO_BITMAP_LONGS,
1304 .size = sizeof(long), .align = sizeof(long),
1305 .active = ioperm_active, .get = ioperm_get
1306 },
1307};
1308
1309static const struct user_regset_view user_x86_64_view = {
1310 .name = "x86_64", .e_machine = EM_X86_64,
1311 .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1312};
1313
1314#else /* CONFIG_X86_32 */
1315
1316#define user_regs_struct32 user_regs_struct
1317#define genregs32_get genregs_get
1318#define genregs32_set genregs_set
1319
1320#endif /* CONFIG_X86_64 */
1321
1322#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1323static struct user_regset x86_32_regsets[] __read_mostly = {
1324 [REGSET_GENERAL] = {
1325 .core_note_type = NT_PRSTATUS,
1326 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1327 .size = sizeof(u32), .align = sizeof(u32),
1328 .get = genregs32_get, .set = genregs32_set
1329 },
1330 [REGSET_FP] = {
1331 .core_note_type = NT_PRFPREG,
1332 .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32),
1333 .size = sizeof(u32), .align = sizeof(u32),
1334 .active = regset_fpregs_active, .get = fpregs_get, .set = fpregs_set
1335 },
1336 [REGSET_XFP] = {
1337 .core_note_type = NT_PRXFPREG,
1338 .n = sizeof(struct user32_fxsr_struct) / sizeof(u32),
1339 .size = sizeof(u32), .align = sizeof(u32),
1340 .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set
1341 },
1342 [REGSET_XSTATE] = {
1343 .core_note_type = NT_X86_XSTATE,
1344 .size = sizeof(u64), .align = sizeof(u64),
1345 .active = xstateregs_active, .get = xstateregs_get,
1346 .set = xstateregs_set
1347 },
1348 [REGSET_TLS] = {
1349 .core_note_type = NT_386_TLS,
1350 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1351 .size = sizeof(struct user_desc),
1352 .align = sizeof(struct user_desc),
1353 .active = regset_tls_active,
1354 .get = regset_tls_get, .set = regset_tls_set
1355 },
1356 [REGSET_IOPERM32] = {
1357 .core_note_type = NT_386_IOPERM,
1358 .n = IO_BITMAP_BYTES / sizeof(u32),
1359 .size = sizeof(u32), .align = sizeof(u32),
1360 .active = ioperm_active, .get = ioperm_get
1361 },
1362};
1363
1364static const struct user_regset_view user_x86_32_view = {
1365 .name = "i386", .e_machine = EM_386,
1366 .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1367};
1368#endif
1369
1370/*
1371 * This represents bytes 464..511 in the memory layout exported through
1372 * the REGSET_XSTATE interface.
1373 */
1374u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
1375
1376void update_regset_xstate_info(unsigned int size, u64 xstate_mask)
1377{
1378#ifdef CONFIG_X86_64
1379 x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1380#endif
1381#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1382 x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1383#endif
1384 xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask;
1385}
1386
1387const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1388{
1389#ifdef CONFIG_IA32_EMULATION
1390 if (test_tsk_thread_flag(task, TIF_IA32))
1391#endif
1392#if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1393 return &user_x86_32_view;
1394#endif
1395#ifdef CONFIG_X86_64
1396 return &user_x86_64_view;
1397#endif
1398}
1399
1400static void fill_sigtrap_info(struct task_struct *tsk,
1401 struct pt_regs *regs,
1402 int error_code, int si_code,
1403 struct siginfo *info)
1404{
1405 tsk->thread.trap_nr = X86_TRAP_DB;
1406 tsk->thread.error_code = error_code;
1407
1408 memset(info, 0, sizeof(*info));
1409 info->si_signo = SIGTRAP;
1410 info->si_code = si_code;
1411 info->si_addr = user_mode(regs) ? (void __user *)regs->ip : NULL;
1412}
1413
1414void user_single_step_siginfo(struct task_struct *tsk,
1415 struct pt_regs *regs,
1416 struct siginfo *info)
1417{
1418 fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info);
1419}
1420
1421void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
1422 int error_code, int si_code)
1423{
1424 struct siginfo info;
1425
1426 fill_sigtrap_info(tsk, regs, error_code, si_code, &info);
1427 /* Send us the fake SIGTRAP */
1428 force_sig_info(SIGTRAP, &info, tsk);
1429}