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