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