1 /* By Ross Biro 1/23/92 */
3 * Pentium III FXSR, SSE support
4 * Gareth Hughes <gareth@valinux.com>, May 2000
7 #include <linux/kernel.h>
8 #include <linux/sched.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>
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>
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>
48 REGSET_IOPERM64 = REGSET_XFP,
54 struct pt_regs_offset {
59 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
60 #define REG_OFFSET_END {.name = NULL, .offset = 0}
62 static const struct pt_regs_offset regoffset_table[] = {
86 REG_OFFSET_NAME(orig_ax),
89 REG_OFFSET_NAME(flags),
96 * regs_query_register_offset() - query register offset from its name
97 * @name: the name of a register
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;
102 int regs_query_register_offset(const char *name)
104 const struct pt_regs_offset *roff;
105 for (roff = regoffset_table; roff->name != NULL; roff++)
106 if (!strcmp(roff->name, name))
112 * regs_query_register_name() - query register name from its offset
113 * @offset: the offset of a register in struct pt_regs.
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;
118 const char *regs_query_register_name(unsigned int offset)
120 const struct pt_regs_offset *roff;
121 for (roff = regoffset_table; roff->name != NULL; roff++)
122 if (roff->offset == offset)
128 * does not yet catch signals sent when the child dies.
129 * in exit.c or in signal.c.
133 * Determines which flags the user has access to [1 = access, 0 = no access].
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))
143 * Determines whether a value may be installed in a segment register.
145 static inline bool invalid_selector(u16 value)
147 return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL);
152 #define FLAG_MASK FLAG_MASK_32
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'.
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
164 * This is valid only for kernel mode traps.
166 unsigned long kernel_stack_pointer(struct pt_regs *regs)
168 unsigned long context = (unsigned long)regs & ~(THREAD_SIZE - 1);
169 unsigned long sp = (unsigned long)®s->sp;
172 if (context == (sp & ~(THREAD_SIZE - 1)))
175 prev_esp = (u32 *)(context);
177 return (unsigned long)prev_esp;
179 return (unsigned long)regs;
181 EXPORT_SYMBOL_GPL(kernel_stack_pointer);
183 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
185 BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
186 return ®s->bx + (regno >> 2);
189 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
192 * Returning the value truncates it to 16 bits.
195 if (offset != offsetof(struct user_regs_struct, gs))
196 retval = *pt_regs_access(task_pt_regs(task), offset);
199 retval = get_user_gs(task_pt_regs(task));
201 retval = task_user_gs(task);
206 static int set_segment_reg(struct task_struct *task,
207 unsigned long offset, u16 value)
210 * The value argument was already truncated to 16 bits.
212 if (invalid_selector(value))
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.
225 case offsetof(struct user_regs_struct, cs):
226 case offsetof(struct user_regs_struct, ss):
227 if (unlikely(value == 0))
231 *pt_regs_access(task_pt_regs(task), offset) = value;
234 case offsetof(struct user_regs_struct, gs):
236 set_user_gs(task_pt_regs(task), value);
238 task_user_gs(task) = value;
244 #else /* CONFIG_X86_64 */
246 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
248 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
250 BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
251 return ®s->r15 + (offset / sizeof(regs->r15));
254 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
257 * Returning the value truncates it to 16 bits.
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));
268 return task->thread.fsindex;
269 case offsetof(struct user_regs_struct, gs):
270 if (task == current) {
271 asm("movl %%gs,%0" : "=r" (seg));
274 return task->thread.gsindex;
275 case offsetof(struct user_regs_struct, ds):
276 if (task == current) {
277 asm("movl %%ds,%0" : "=r" (seg));
280 return task->thread.ds;
281 case offsetof(struct user_regs_struct, es):
282 if (task == current) {
283 asm("movl %%es,%0" : "=r" (seg));
286 return task->thread.es;
288 case offsetof(struct user_regs_struct, cs):
289 case offsetof(struct user_regs_struct, ss):
292 return *pt_regs_access(task_pt_regs(task), offset);
295 static int set_segment_reg(struct task_struct *task,
296 unsigned long offset, u16 value)
299 * The value argument was already truncated to 16 bits.
301 if (invalid_selector(value))
305 case offsetof(struct user_regs_struct,fs):
306 task->thread.fsindex = value;
308 loadsegment(fs, task->thread.fsindex);
310 case offsetof(struct user_regs_struct,gs):
311 task->thread.gsindex = value;
313 load_gs_index(task->thread.gsindex);
315 case offsetof(struct user_regs_struct,ds):
316 task->thread.ds = value;
318 loadsegment(ds, task->thread.ds);
320 case offsetof(struct user_regs_struct,es):
321 task->thread.es = value;
323 loadsegment(es, task->thread.es);
327 * Can't actually change these in 64-bit mode.
329 case offsetof(struct user_regs_struct,cs):
330 if (unlikely(value == 0))
332 task_pt_regs(task)->cs = value;
334 case offsetof(struct user_regs_struct,ss):
335 if (unlikely(value == 0))
337 task_pt_regs(task)->ss = value;
344 #endif /* CONFIG_X86_32 */
346 static unsigned long get_flags(struct task_struct *task)
348 unsigned long retval = task_pt_regs(task)->flags;
351 * If the debugger set TF, hide it from the readout.
353 if (test_tsk_thread_flag(task, TIF_FORCED_TF))
354 retval &= ~X86_EFLAGS_TF;
359 static int set_flags(struct task_struct *task, unsigned long value)
361 struct pt_regs *regs = task_pt_regs(task);
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.
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;
373 regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
378 static int putreg(struct task_struct *child,
379 unsigned long offset, unsigned long value)
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);
390 case offsetof(struct user_regs_struct, flags):
391 return set_flags(child, value);
394 case offsetof(struct user_regs_struct,fs_base):
395 if (value >= TASK_SIZE_MAX)
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.
402 if (child->thread.fsbase != value)
403 return do_arch_prctl(child, ARCH_SET_FS, value);
405 case offsetof(struct user_regs_struct,gs_base):
407 * Exactly the same here as the %fs handling above.
409 if (value >= TASK_SIZE_MAX)
411 if (child->thread.gsbase != value)
412 return do_arch_prctl(child, ARCH_SET_GS, value);
417 *pt_regs_access(task_pt_regs(child), offset) = value;
421 static unsigned long getreg(struct task_struct *task, unsigned long 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);
432 case offsetof(struct user_regs_struct, flags):
433 return get_flags(task);
436 case offsetof(struct user_regs_struct, fs_base): {
438 * XXX: This will not behave as expected if called on
439 * current or if fsindex != 0.
441 return task->thread.fsbase;
443 case offsetof(struct user_regs_struct, gs_base): {
445 * XXX: This will not behave as expected if called on
446 * current or if fsindex != 0.
448 return task->thread.gsbase;
453 return *pt_regs_access(task_pt_regs(task), offset);
456 static 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)
462 unsigned long *k = kbuf;
463 while (count >= sizeof(*k)) {
464 *k++ = getreg(target, pos);
469 unsigned long __user *u = ubuf;
470 while (count >= sizeof(*u)) {
471 if (__put_user(getreg(target, pos), u++))
481 static 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)
488 const unsigned long *k = kbuf;
489 while (count >= sizeof(*k) && !ret) {
490 ret = putreg(target, pos, *k++);
495 const unsigned long __user *u = ubuf;
496 while (count >= sizeof(*u) && !ret) {
498 ret = __get_user(word, u++);
501 ret = putreg(target, pos, word);
509 static void ptrace_triggered(struct perf_event *bp,
510 struct perf_sample_data *data,
511 struct pt_regs *regs)
514 struct thread_struct *thread = &(current->thread);
517 * Store in the virtual DR6 register the fact that the breakpoint
518 * was hit so the thread's debugger will see it.
520 for (i = 0; i < HBP_NUM; i++) {
521 if (thread->ptrace_bps[i] == bp)
525 thread->debugreg6 |= (DR_TRAP0 << i);
529 * Walk through every ptrace breakpoints for this thread and
530 * build the dr7 value on top of their attributes.
533 static unsigned long ptrace_get_dr7(struct perf_event *bp[])
537 struct arch_hw_breakpoint *info;
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);
549 static int ptrace_fill_bp_fields(struct perf_event_attr *attr,
550 int len, int type, bool disabled)
552 int err, bp_len, bp_type;
554 err = arch_bp_generic_fields(len, type, &bp_len, &bp_type);
556 attr->bp_len = bp_len;
557 attr->bp_type = bp_type;
558 attr->disabled = disabled;
564 static struct perf_event *
565 ptrace_register_breakpoint(struct task_struct *tsk, int len, int type,
566 unsigned long addr, bool disabled)
568 struct perf_event_attr attr;
571 ptrace_breakpoint_init(&attr);
574 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
578 return register_user_hw_breakpoint(&attr, ptrace_triggered,
582 static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type,
585 struct perf_event_attr attr = bp->attr;
588 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
592 return modify_user_hw_breakpoint(bp, &attr);
596 * Handle ptrace writes to debug register 7.
598 static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data)
600 struct thread_struct *thread = &tsk->thread;
601 unsigned long old_dr7;
602 bool second_pass = false;
605 data &= ~DR_CONTROL_RESERVED;
606 old_dr7 = ptrace_get_dr7(thread->ptrace_bps);
610 for (i = 0; i < HBP_NUM; i++) {
612 bool disabled = !decode_dr7(data, i, &len, &type);
613 struct perf_event *bp = thread->ptrace_bps[i];
619 bp = ptrace_register_breakpoint(tsk,
620 len, type, 0, disabled);
626 thread->ptrace_bps[i] = bp;
630 rc = ptrace_modify_breakpoint(bp, len, type, disabled);
635 /* Restore if the first pass failed, second_pass shouldn't fail. */
636 if (rc && !WARN_ON(second_pass)) {
647 * Handle PTRACE_PEEKUSR calls for the debug register area.
649 static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
651 struct thread_struct *thread = &tsk->thread;
652 unsigned long val = 0;
655 struct perf_event *bp = thread->ptrace_bps[n];
658 val = bp->hw.info.address;
660 val = thread->debugreg6;
662 val = thread->ptrace_dr7;
667 static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr,
670 struct thread_struct *t = &tsk->thread;
671 struct perf_event *bp = t->ptrace_bps[nr];
676 * Put stub len and type to create an inactive but correct bp.
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
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
686 bp = ptrace_register_breakpoint(tsk,
687 X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE,
692 t->ptrace_bps[nr] = bp;
694 struct perf_event_attr attr = bp->attr;
697 err = modify_user_hw_breakpoint(bp, &attr);
704 * Handle PTRACE_POKEUSR calls for the debug register area.
706 static int ptrace_set_debugreg(struct task_struct *tsk, int n,
709 struct thread_struct *thread = &tsk->thread;
710 /* There are no DR4 or DR5 registers */
714 rc = ptrace_set_breakpoint_addr(tsk, n, val);
716 thread->debugreg6 = val;
719 rc = ptrace_write_dr7(tsk, val);
721 thread->ptrace_dr7 = val;
727 * These access the current or another (stopped) task's io permission
728 * bitmap for debugging or core dump.
730 static int ioperm_active(struct task_struct *target,
731 const struct user_regset *regset)
733 return target->thread.io_bitmap_max / regset->size;
736 static 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)
741 if (!target->thread.io_bitmap_ptr)
744 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
745 target->thread.io_bitmap_ptr,
750 * Called by kernel/ptrace.c when detaching..
752 * Make sure the single step bit is not set.
754 void ptrace_disable(struct task_struct *child)
756 user_disable_single_step(child);
757 #ifdef TIF_SYSCALL_EMU
758 clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
762 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
763 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
766 long arch_ptrace(struct task_struct *child, long request,
767 unsigned long addr, unsigned long data)
770 unsigned long __user *datap = (unsigned long __user *)data;
773 /* read the word at location addr in the USER area. */
774 case PTRACE_PEEKUSR: {
778 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
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));
789 ret = put_user(tmp, datap);
793 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
795 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
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);
808 case PTRACE_GETREGS: /* Get all gp regs from the child. */
809 return copy_regset_to_user(child,
810 task_user_regset_view(current),
812 0, sizeof(struct user_regs_struct),
815 case PTRACE_SETREGS: /* Set all gp regs in the child. */
816 return copy_regset_from_user(child,
817 task_user_regset_view(current),
819 0, sizeof(struct user_regs_struct),
822 case PTRACE_GETFPREGS: /* Get the child FPU state. */
823 return copy_regset_to_user(child,
824 task_user_regset_view(current),
826 0, sizeof(struct user_i387_struct),
829 case PTRACE_SETFPREGS: /* Set the child FPU state. */
830 return copy_regset_from_user(child,
831 task_user_regset_view(current),
833 0, sizeof(struct user_i387_struct),
837 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
838 return copy_regset_to_user(child, &user_x86_32_view,
840 0, sizeof(struct user_fxsr_struct),
843 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
844 return copy_regset_from_user(child, &user_x86_32_view,
846 0, sizeof(struct user_fxsr_struct),
850 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
851 case PTRACE_GET_THREAD_AREA:
854 ret = do_get_thread_area(child, addr,
855 (struct user_desc __user *)data);
858 case PTRACE_SET_THREAD_AREA:
861 ret = do_set_thread_area(child, addr,
862 (struct user_desc __user *)data, 0);
867 /* normal 64bit interface to access TLS data.
868 Works just like arch_prctl, except that the arguments
870 case PTRACE_ARCH_PRCTL:
871 ret = do_arch_prctl(child, data, addr);
876 ret = ptrace_request(child, request, addr, data);
883 #ifdef CONFIG_IA32_EMULATION
885 #include <linux/compat.h>
886 #include <linux/syscalls.h>
887 #include <asm/ia32.h>
888 #include <asm/user32.h>
891 case offsetof(struct user32, regs.l): \
892 regs->q = value; break
895 case offsetof(struct user32, regs.rs): \
896 return set_segment_reg(child, \
897 offsetof(struct user_regs_struct, rs), \
901 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
903 struct pt_regs *regs = task_pt_regs(child);
924 case offsetof(struct user32, regs.orig_eax):
926 * A 32-bit debugger setting orig_eax means to restore
927 * the state of the task restarting a 32-bit syscall.
928 * Make sure we interpret the -ERESTART* codes correctly
929 * in case the task is not actually still sitting at the
930 * exit from a 32-bit syscall with TS_COMPAT still set.
932 regs->orig_ax = value;
933 if (syscall_get_nr(child, regs) >= 0)
934 task_thread_info(child)->status |= TS_COMPAT;
937 case offsetof(struct user32, regs.eflags):
938 return set_flags(child, value);
940 case offsetof(struct user32, u_debugreg[0]) ...
941 offsetof(struct user32, u_debugreg[7]):
942 regno -= offsetof(struct user32, u_debugreg[0]);
943 return ptrace_set_debugreg(child, regno / 4, value);
946 if (regno > sizeof(struct user32) || (regno & 3))
950 * Other dummy fields in the virtual user structure
962 case offsetof(struct user32, regs.l): \
963 *val = regs->q; break
966 case offsetof(struct user32, regs.rs): \
967 *val = get_segment_reg(child, \
968 offsetof(struct user_regs_struct, rs)); \
971 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
973 struct pt_regs *regs = task_pt_regs(child);
991 R32(orig_eax, orig_ax);
995 case offsetof(struct user32, regs.eflags):
996 *val = get_flags(child);
999 case offsetof(struct user32, u_debugreg[0]) ...
1000 offsetof(struct user32, u_debugreg[7]):
1001 regno -= offsetof(struct user32, u_debugreg[0]);
1002 *val = ptrace_get_debugreg(child, regno / 4);
1006 if (regno > sizeof(struct user32) || (regno & 3))
1010 * Other dummy fields in the virtual user structure
1022 static int genregs32_get(struct task_struct *target,
1023 const struct user_regset *regset,
1024 unsigned int pos, unsigned int count,
1025 void *kbuf, void __user *ubuf)
1028 compat_ulong_t *k = kbuf;
1029 while (count >= sizeof(*k)) {
1030 getreg32(target, pos, k++);
1031 count -= sizeof(*k);
1035 compat_ulong_t __user *u = ubuf;
1036 while (count >= sizeof(*u)) {
1037 compat_ulong_t word;
1038 getreg32(target, pos, &word);
1039 if (__put_user(word, u++))
1041 count -= sizeof(*u);
1049 static int genregs32_set(struct task_struct *target,
1050 const struct user_regset *regset,
1051 unsigned int pos, unsigned int count,
1052 const void *kbuf, const void __user *ubuf)
1056 const compat_ulong_t *k = kbuf;
1057 while (count >= sizeof(*k) && !ret) {
1058 ret = putreg32(target, pos, *k++);
1059 count -= sizeof(*k);
1063 const compat_ulong_t __user *u = ubuf;
1064 while (count >= sizeof(*u) && !ret) {
1065 compat_ulong_t word;
1066 ret = __get_user(word, u++);
1069 ret = putreg32(target, pos, word);
1070 count -= sizeof(*u);
1077 static long ia32_arch_ptrace(struct task_struct *child, compat_long_t request,
1078 compat_ulong_t caddr, compat_ulong_t cdata)
1080 unsigned long addr = caddr;
1081 unsigned long data = cdata;
1082 void __user *datap = compat_ptr(data);
1087 case PTRACE_PEEKUSR:
1088 ret = getreg32(child, addr, &val);
1090 ret = put_user(val, (__u32 __user *)datap);
1093 case PTRACE_POKEUSR:
1094 ret = putreg32(child, addr, data);
1097 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1098 return copy_regset_to_user(child, &user_x86_32_view,
1100 0, sizeof(struct user_regs_struct32),
1103 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1104 return copy_regset_from_user(child, &user_x86_32_view,
1106 sizeof(struct user_regs_struct32),
1109 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1110 return copy_regset_to_user(child, &user_x86_32_view,
1112 sizeof(struct user_i387_ia32_struct),
1115 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1116 return copy_regset_from_user(
1117 child, &user_x86_32_view, REGSET_FP,
1118 0, sizeof(struct user_i387_ia32_struct), datap);
1120 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1121 return copy_regset_to_user(child, &user_x86_32_view,
1123 sizeof(struct user32_fxsr_struct),
1126 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1127 return copy_regset_from_user(child, &user_x86_32_view,
1129 sizeof(struct user32_fxsr_struct),
1132 case PTRACE_GET_THREAD_AREA:
1133 case PTRACE_SET_THREAD_AREA:
1134 return arch_ptrace(child, request, addr, data);
1137 return compat_ptrace_request(child, request, addr, data);
1142 #endif /* CONFIG_IA32_EMULATION */
1144 #ifdef CONFIG_X86_X32_ABI
1145 static long x32_arch_ptrace(struct task_struct *child,
1146 compat_long_t request, compat_ulong_t caddr,
1147 compat_ulong_t cdata)
1149 unsigned long addr = caddr;
1150 unsigned long data = cdata;
1151 void __user *datap = compat_ptr(data);
1155 /* Read 32bits at location addr in the USER area. Only allow
1156 to return the lower 32bits of segment and debug registers. */
1157 case PTRACE_PEEKUSR: {
1161 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1162 addr < offsetof(struct user_regs_struct, cs))
1165 tmp = 0; /* Default return condition */
1166 if (addr < sizeof(struct user_regs_struct))
1167 tmp = getreg(child, addr);
1168 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1169 addr <= offsetof(struct user, u_debugreg[7])) {
1170 addr -= offsetof(struct user, u_debugreg[0]);
1171 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
1173 ret = put_user(tmp, (__u32 __user *)datap);
1177 /* Write the word at location addr in the USER area. Only allow
1178 to update segment and debug registers with the upper 32bits
1180 case PTRACE_POKEUSR:
1182 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1183 addr < offsetof(struct user_regs_struct, cs))
1186 if (addr < sizeof(struct user_regs_struct))
1187 ret = putreg(child, addr, data);
1188 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1189 addr <= offsetof(struct user, u_debugreg[7])) {
1190 addr -= offsetof(struct user, u_debugreg[0]);
1191 ret = ptrace_set_debugreg(child,
1192 addr / sizeof(data), data);
1196 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1197 return copy_regset_to_user(child,
1198 task_user_regset_view(current),
1200 0, sizeof(struct user_regs_struct),
1203 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1204 return copy_regset_from_user(child,
1205 task_user_regset_view(current),
1207 0, sizeof(struct user_regs_struct),
1210 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1211 return copy_regset_to_user(child,
1212 task_user_regset_view(current),
1214 0, sizeof(struct user_i387_struct),
1217 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1218 return copy_regset_from_user(child,
1219 task_user_regset_view(current),
1221 0, sizeof(struct user_i387_struct),
1225 return compat_ptrace_request(child, request, addr, data);
1232 #ifdef CONFIG_COMPAT
1233 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1234 compat_ulong_t caddr, compat_ulong_t cdata)
1236 #ifdef CONFIG_X86_X32_ABI
1237 if (!in_ia32_syscall())
1238 return x32_arch_ptrace(child, request, caddr, cdata);
1240 #ifdef CONFIG_IA32_EMULATION
1241 return ia32_arch_ptrace(child, request, caddr, cdata);
1246 #endif /* CONFIG_COMPAT */
1248 #ifdef CONFIG_X86_64
1250 static struct user_regset x86_64_regsets[] __read_mostly = {
1251 [REGSET_GENERAL] = {
1252 .core_note_type = NT_PRSTATUS,
1253 .n = sizeof(struct user_regs_struct) / sizeof(long),
1254 .size = sizeof(long), .align = sizeof(long),
1255 .get = genregs_get, .set = genregs_set
1258 .core_note_type = NT_PRFPREG,
1259 .n = sizeof(struct user_i387_struct) / sizeof(long),
1260 .size = sizeof(long), .align = sizeof(long),
1261 .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set
1264 .core_note_type = NT_X86_XSTATE,
1265 .size = sizeof(u64), .align = sizeof(u64),
1266 .active = xstateregs_active, .get = xstateregs_get,
1267 .set = xstateregs_set
1269 [REGSET_IOPERM64] = {
1270 .core_note_type = NT_386_IOPERM,
1271 .n = IO_BITMAP_LONGS,
1272 .size = sizeof(long), .align = sizeof(long),
1273 .active = ioperm_active, .get = ioperm_get
1277 static const struct user_regset_view user_x86_64_view = {
1278 .name = "x86_64", .e_machine = EM_X86_64,
1279 .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1282 #else /* CONFIG_X86_32 */
1284 #define user_regs_struct32 user_regs_struct
1285 #define genregs32_get genregs_get
1286 #define genregs32_set genregs_set
1288 #endif /* CONFIG_X86_64 */
1290 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1291 static struct user_regset x86_32_regsets[] __read_mostly = {
1292 [REGSET_GENERAL] = {
1293 .core_note_type = NT_PRSTATUS,
1294 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1295 .size = sizeof(u32), .align = sizeof(u32),
1296 .get = genregs32_get, .set = genregs32_set
1299 .core_note_type = NT_PRFPREG,
1300 .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32),
1301 .size = sizeof(u32), .align = sizeof(u32),
1302 .active = regset_fpregs_active, .get = fpregs_get, .set = fpregs_set
1305 .core_note_type = NT_PRXFPREG,
1306 .n = sizeof(struct user32_fxsr_struct) / sizeof(u32),
1307 .size = sizeof(u32), .align = sizeof(u32),
1308 .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set
1311 .core_note_type = NT_X86_XSTATE,
1312 .size = sizeof(u64), .align = sizeof(u64),
1313 .active = xstateregs_active, .get = xstateregs_get,
1314 .set = xstateregs_set
1317 .core_note_type = NT_386_TLS,
1318 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1319 .size = sizeof(struct user_desc),
1320 .align = sizeof(struct user_desc),
1321 .active = regset_tls_active,
1322 .get = regset_tls_get, .set = regset_tls_set
1324 [REGSET_IOPERM32] = {
1325 .core_note_type = NT_386_IOPERM,
1326 .n = IO_BITMAP_BYTES / sizeof(u32),
1327 .size = sizeof(u32), .align = sizeof(u32),
1328 .active = ioperm_active, .get = ioperm_get
1332 static const struct user_regset_view user_x86_32_view = {
1333 .name = "i386", .e_machine = EM_386,
1334 .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1339 * This represents bytes 464..511 in the memory layout exported through
1340 * the REGSET_XSTATE interface.
1342 u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
1344 void update_regset_xstate_info(unsigned int size, u64 xstate_mask)
1346 #ifdef CONFIG_X86_64
1347 x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1349 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1350 x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1352 xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask;
1355 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1357 #ifdef CONFIG_IA32_EMULATION
1358 if (test_tsk_thread_flag(task, TIF_IA32))
1360 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1361 return &user_x86_32_view;
1363 #ifdef CONFIG_X86_64
1364 return &user_x86_64_view;
1368 static void fill_sigtrap_info(struct task_struct *tsk,
1369 struct pt_regs *regs,
1370 int error_code, int si_code,
1371 struct siginfo *info)
1373 tsk->thread.trap_nr = X86_TRAP_DB;
1374 tsk->thread.error_code = error_code;
1376 memset(info, 0, sizeof(*info));
1377 info->si_signo = SIGTRAP;
1378 info->si_code = si_code;
1379 info->si_addr = user_mode(regs) ? (void __user *)regs->ip : NULL;
1382 void user_single_step_siginfo(struct task_struct *tsk,
1383 struct pt_regs *regs,
1384 struct siginfo *info)
1386 fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info);
1389 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
1390 int error_code, int si_code)
1392 struct siginfo info;
1394 fill_sigtrap_info(tsk, regs, error_code, si_code, &info);
1395 /* Send us the fake SIGTRAP */
1396 force_sig_info(SIGTRAP, &info, tsk);