1 // SPDX-License-Identifier: GPL-2.0-only
2 /* By Ross Biro 1/23/92 */
4 * Pentium III FXSR, SSE support
5 * Gareth Hughes <gareth@valinux.com>, May 2000
8 #include <linux/kernel.h>
9 #include <linux/sched.h>
10 #include <linux/sched/task_stack.h>
12 #include <linux/smp.h>
13 #include <linux/errno.h>
14 #include <linux/slab.h>
15 #include <linux/ptrace.h>
16 #include <linux/tracehook.h>
17 #include <linux/user.h>
18 #include <linux/elf.h>
19 #include <linux/security.h>
20 #include <linux/audit.h>
21 #include <linux/seccomp.h>
22 #include <linux/signal.h>
23 #include <linux/perf_event.h>
24 #include <linux/hw_breakpoint.h>
25 #include <linux/rcupdate.h>
26 #include <linux/export.h>
27 #include <linux/context_tracking.h>
28 #include <linux/nospec.h>
30 #include <linux/uaccess.h>
31 #include <asm/pgtable.h>
32 #include <asm/processor.h>
33 #include <asm/fpu/internal.h>
34 #include <asm/fpu/signal.h>
35 #include <asm/fpu/regset.h>
36 #include <asm/debugreg.h>
39 #include <asm/prctl.h>
40 #include <asm/proto.h>
41 #include <asm/hw_breakpoint.h>
42 #include <asm/traps.h>
43 #include <asm/syscall.h>
44 #include <asm/fsgsbase.h>
52 REGSET_IOPERM64 = REGSET_XFP,
58 struct pt_regs_offset {
63 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
64 #define REG_OFFSET_END {.name = NULL, .offset = 0}
66 static const struct pt_regs_offset regoffset_table[] = {
90 REG_OFFSET_NAME(orig_ax),
93 REG_OFFSET_NAME(flags),
100 * regs_query_register_offset() - query register offset from its name
101 * @name: the name of a register
103 * regs_query_register_offset() returns the offset of a register in struct
104 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
106 int regs_query_register_offset(const char *name)
108 const struct pt_regs_offset *roff;
109 for (roff = regoffset_table; roff->name != NULL; roff++)
110 if (!strcmp(roff->name, name))
116 * regs_query_register_name() - query register name from its offset
117 * @offset: the offset of a register in struct pt_regs.
119 * regs_query_register_name() returns the name of a register from its
120 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
122 const char *regs_query_register_name(unsigned int offset)
124 const struct pt_regs_offset *roff;
125 for (roff = regoffset_table; roff->name != NULL; roff++)
126 if (roff->offset == offset)
132 * does not yet catch signals sent when the child dies.
133 * in exit.c or in signal.c.
137 * Determines which flags the user has access to [1 = access, 0 = no access].
139 #define FLAG_MASK_32 ((unsigned long) \
140 (X86_EFLAGS_CF | X86_EFLAGS_PF | \
141 X86_EFLAGS_AF | X86_EFLAGS_ZF | \
142 X86_EFLAGS_SF | X86_EFLAGS_TF | \
143 X86_EFLAGS_DF | X86_EFLAGS_OF | \
144 X86_EFLAGS_RF | X86_EFLAGS_AC))
147 * Determines whether a value may be installed in a segment register.
149 static inline bool invalid_selector(u16 value)
151 return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL);
156 #define FLAG_MASK FLAG_MASK_32
158 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
160 BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
161 return ®s->bx + (regno >> 2);
164 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
167 * Returning the value truncates it to 16 bits.
170 if (offset != offsetof(struct user_regs_struct, gs))
171 retval = *pt_regs_access(task_pt_regs(task), offset);
174 retval = get_user_gs(task_pt_regs(task));
176 retval = task_user_gs(task);
181 static int set_segment_reg(struct task_struct *task,
182 unsigned long offset, u16 value)
185 * The value argument was already truncated to 16 bits.
187 if (invalid_selector(value))
191 * For %cs and %ss we cannot permit a null selector.
192 * We can permit a bogus selector as long as it has USER_RPL.
193 * Null selectors are fine for other segment registers, but
194 * we will never get back to user mode with invalid %cs or %ss
195 * and will take the trap in iret instead. Much code relies
196 * on user_mode() to distinguish a user trap frame (which can
197 * safely use invalid selectors) from a kernel trap frame.
200 case offsetof(struct user_regs_struct, cs):
201 case offsetof(struct user_regs_struct, ss):
202 if (unlikely(value == 0))
204 /* Else, fall through */
207 *pt_regs_access(task_pt_regs(task), offset) = value;
210 case offsetof(struct user_regs_struct, gs):
212 set_user_gs(task_pt_regs(task), value);
214 task_user_gs(task) = value;
220 #else /* CONFIG_X86_64 */
222 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
224 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
226 BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
227 return ®s->r15 + (offset / sizeof(regs->r15));
230 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
233 * Returning the value truncates it to 16 bits.
238 case offsetof(struct user_regs_struct, fs):
239 if (task == current) {
240 /* Older gas can't assemble movq %?s,%r?? */
241 asm("movl %%fs,%0" : "=r" (seg));
244 return task->thread.fsindex;
245 case offsetof(struct user_regs_struct, gs):
246 if (task == current) {
247 asm("movl %%gs,%0" : "=r" (seg));
250 return task->thread.gsindex;
251 case offsetof(struct user_regs_struct, ds):
252 if (task == current) {
253 asm("movl %%ds,%0" : "=r" (seg));
256 return task->thread.ds;
257 case offsetof(struct user_regs_struct, es):
258 if (task == current) {
259 asm("movl %%es,%0" : "=r" (seg));
262 return task->thread.es;
264 case offsetof(struct user_regs_struct, cs):
265 case offsetof(struct user_regs_struct, ss):
268 return *pt_regs_access(task_pt_regs(task), offset);
271 static int set_segment_reg(struct task_struct *task,
272 unsigned long offset, u16 value)
275 * The value argument was already truncated to 16 bits.
277 if (invalid_selector(value))
281 case offsetof(struct user_regs_struct,fs):
282 task->thread.fsindex = value;
284 loadsegment(fs, task->thread.fsindex);
286 case offsetof(struct user_regs_struct,gs):
287 task->thread.gsindex = value;
289 load_gs_index(task->thread.gsindex);
291 case offsetof(struct user_regs_struct,ds):
292 task->thread.ds = value;
294 loadsegment(ds, task->thread.ds);
296 case offsetof(struct user_regs_struct,es):
297 task->thread.es = value;
299 loadsegment(es, task->thread.es);
303 * Can't actually change these in 64-bit mode.
305 case offsetof(struct user_regs_struct,cs):
306 if (unlikely(value == 0))
308 task_pt_regs(task)->cs = value;
310 case offsetof(struct user_regs_struct,ss):
311 if (unlikely(value == 0))
313 task_pt_regs(task)->ss = value;
320 #endif /* CONFIG_X86_32 */
322 static unsigned long get_flags(struct task_struct *task)
324 unsigned long retval = task_pt_regs(task)->flags;
327 * If the debugger set TF, hide it from the readout.
329 if (test_tsk_thread_flag(task, TIF_FORCED_TF))
330 retval &= ~X86_EFLAGS_TF;
335 static int set_flags(struct task_struct *task, unsigned long value)
337 struct pt_regs *regs = task_pt_regs(task);
340 * If the user value contains TF, mark that
341 * it was not "us" (the debugger) that set it.
342 * If not, make sure it stays set if we had.
344 if (value & X86_EFLAGS_TF)
345 clear_tsk_thread_flag(task, TIF_FORCED_TF);
346 else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
347 value |= X86_EFLAGS_TF;
349 regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
354 static int putreg(struct task_struct *child,
355 unsigned long offset, unsigned long value)
358 case offsetof(struct user_regs_struct, cs):
359 case offsetof(struct user_regs_struct, ds):
360 case offsetof(struct user_regs_struct, es):
361 case offsetof(struct user_regs_struct, fs):
362 case offsetof(struct user_regs_struct, gs):
363 case offsetof(struct user_regs_struct, ss):
364 return set_segment_reg(child, offset, value);
366 case offsetof(struct user_regs_struct, flags):
367 return set_flags(child, value);
370 case offsetof(struct user_regs_struct,fs_base):
371 if (value >= TASK_SIZE_MAX)
374 * When changing the FS base, use do_arch_prctl_64()
375 * to set the index to zero and to set the base
378 if (child->thread.fsbase != value)
379 return do_arch_prctl_64(child, ARCH_SET_FS, value);
381 case offsetof(struct user_regs_struct,gs_base):
383 * Exactly the same here as the %fs handling above.
385 if (value >= TASK_SIZE_MAX)
387 if (child->thread.gsbase != value)
388 return do_arch_prctl_64(child, ARCH_SET_GS, value);
393 *pt_regs_access(task_pt_regs(child), offset) = value;
397 static unsigned long getreg(struct task_struct *task, unsigned long offset)
400 case offsetof(struct user_regs_struct, cs):
401 case offsetof(struct user_regs_struct, ds):
402 case offsetof(struct user_regs_struct, es):
403 case offsetof(struct user_regs_struct, fs):
404 case offsetof(struct user_regs_struct, gs):
405 case offsetof(struct user_regs_struct, ss):
406 return get_segment_reg(task, offset);
408 case offsetof(struct user_regs_struct, flags):
409 return get_flags(task);
412 case offsetof(struct user_regs_struct, fs_base):
413 return x86_fsbase_read_task(task);
414 case offsetof(struct user_regs_struct, gs_base):
415 return x86_gsbase_read_task(task);
419 return *pt_regs_access(task_pt_regs(task), offset);
422 static int genregs_get(struct task_struct *target,
423 const struct user_regset *regset,
424 unsigned int pos, unsigned int count,
425 void *kbuf, void __user *ubuf)
428 unsigned long *k = kbuf;
429 while (count >= sizeof(*k)) {
430 *k++ = getreg(target, pos);
435 unsigned long __user *u = ubuf;
436 while (count >= sizeof(*u)) {
437 if (__put_user(getreg(target, pos), u++))
447 static int genregs_set(struct task_struct *target,
448 const struct user_regset *regset,
449 unsigned int pos, unsigned int count,
450 const void *kbuf, const void __user *ubuf)
454 const unsigned long *k = kbuf;
455 while (count >= sizeof(*k) && !ret) {
456 ret = putreg(target, pos, *k++);
461 const unsigned long __user *u = ubuf;
462 while (count >= sizeof(*u) && !ret) {
464 ret = __get_user(word, u++);
467 ret = putreg(target, pos, word);
475 static void ptrace_triggered(struct perf_event *bp,
476 struct perf_sample_data *data,
477 struct pt_regs *regs)
480 struct thread_struct *thread = &(current->thread);
483 * Store in the virtual DR6 register the fact that the breakpoint
484 * was hit so the thread's debugger will see it.
486 for (i = 0; i < HBP_NUM; i++) {
487 if (thread->ptrace_bps[i] == bp)
491 thread->debugreg6 |= (DR_TRAP0 << i);
495 * Walk through every ptrace breakpoints for this thread and
496 * build the dr7 value on top of their attributes.
499 static unsigned long ptrace_get_dr7(struct perf_event *bp[])
503 struct arch_hw_breakpoint *info;
505 for (i = 0; i < HBP_NUM; i++) {
506 if (bp[i] && !bp[i]->attr.disabled) {
507 info = counter_arch_bp(bp[i]);
508 dr7 |= encode_dr7(i, info->len, info->type);
515 static int ptrace_fill_bp_fields(struct perf_event_attr *attr,
516 int len, int type, bool disabled)
518 int err, bp_len, bp_type;
520 err = arch_bp_generic_fields(len, type, &bp_len, &bp_type);
522 attr->bp_len = bp_len;
523 attr->bp_type = bp_type;
524 attr->disabled = disabled;
530 static struct perf_event *
531 ptrace_register_breakpoint(struct task_struct *tsk, int len, int type,
532 unsigned long addr, bool disabled)
534 struct perf_event_attr attr;
537 ptrace_breakpoint_init(&attr);
540 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
544 return register_user_hw_breakpoint(&attr, ptrace_triggered,
548 static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type,
551 struct perf_event_attr attr = bp->attr;
554 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
558 return modify_user_hw_breakpoint(bp, &attr);
562 * Handle ptrace writes to debug register 7.
564 static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data)
566 struct thread_struct *thread = &tsk->thread;
567 unsigned long old_dr7;
568 bool second_pass = false;
571 data &= ~DR_CONTROL_RESERVED;
572 old_dr7 = ptrace_get_dr7(thread->ptrace_bps);
576 for (i = 0; i < HBP_NUM; i++) {
578 bool disabled = !decode_dr7(data, i, &len, &type);
579 struct perf_event *bp = thread->ptrace_bps[i];
585 bp = ptrace_register_breakpoint(tsk,
586 len, type, 0, disabled);
592 thread->ptrace_bps[i] = bp;
596 rc = ptrace_modify_breakpoint(bp, len, type, disabled);
601 /* Restore if the first pass failed, second_pass shouldn't fail. */
602 if (rc && !WARN_ON(second_pass)) {
613 * Handle PTRACE_PEEKUSR calls for the debug register area.
615 static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
617 struct thread_struct *thread = &tsk->thread;
618 unsigned long val = 0;
621 int index = array_index_nospec(n, HBP_NUM);
622 struct perf_event *bp = thread->ptrace_bps[index];
625 val = bp->hw.info.address;
627 val = thread->debugreg6;
629 val = thread->ptrace_dr7;
634 static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr,
637 struct thread_struct *t = &tsk->thread;
638 struct perf_event *bp = t->ptrace_bps[nr];
643 * Put stub len and type to create an inactive but correct bp.
645 * CHECKME: the previous code returned -EIO if the addr wasn't
646 * a valid task virtual addr. The new one will return -EINVAL in
648 * -EINVAL may be what we want for in-kernel breakpoints users,
649 * but -EIO looks better for ptrace, since we refuse a register
650 * writing for the user. And anyway this is the previous
653 bp = ptrace_register_breakpoint(tsk,
654 X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE,
659 t->ptrace_bps[nr] = bp;
661 struct perf_event_attr attr = bp->attr;
664 err = modify_user_hw_breakpoint(bp, &attr);
671 * Handle PTRACE_POKEUSR calls for the debug register area.
673 static int ptrace_set_debugreg(struct task_struct *tsk, int n,
676 struct thread_struct *thread = &tsk->thread;
677 /* There are no DR4 or DR5 registers */
681 rc = ptrace_set_breakpoint_addr(tsk, n, val);
683 thread->debugreg6 = val;
686 rc = ptrace_write_dr7(tsk, val);
688 thread->ptrace_dr7 = val;
694 * These access the current or another (stopped) task's io permission
695 * bitmap for debugging or core dump.
697 static int ioperm_active(struct task_struct *target,
698 const struct user_regset *regset)
700 return target->thread.io_bitmap_max / regset->size;
703 static int ioperm_get(struct task_struct *target,
704 const struct user_regset *regset,
705 unsigned int pos, unsigned int count,
706 void *kbuf, void __user *ubuf)
708 if (!target->thread.io_bitmap_ptr)
711 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
712 target->thread.io_bitmap_ptr,
717 * Called by kernel/ptrace.c when detaching..
719 * Make sure the single step bit is not set.
721 void ptrace_disable(struct task_struct *child)
723 user_disable_single_step(child);
726 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
727 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
730 long arch_ptrace(struct task_struct *child, long request,
731 unsigned long addr, unsigned long data)
734 unsigned long __user *datap = (unsigned long __user *)data;
737 /* read the word at location addr in the USER area. */
738 case PTRACE_PEEKUSR: {
742 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
745 tmp = 0; /* Default return condition */
746 if (addr < sizeof(struct user_regs_struct))
747 tmp = getreg(child, addr);
748 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
749 addr <= offsetof(struct user, u_debugreg[7])) {
750 addr -= offsetof(struct user, u_debugreg[0]);
751 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
753 ret = put_user(tmp, datap);
757 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
759 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
762 if (addr < sizeof(struct user_regs_struct))
763 ret = putreg(child, addr, data);
764 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
765 addr <= offsetof(struct user, u_debugreg[7])) {
766 addr -= offsetof(struct user, u_debugreg[0]);
767 ret = ptrace_set_debugreg(child,
768 addr / sizeof(data), data);
772 case PTRACE_GETREGS: /* Get all gp regs from the child. */
773 return copy_regset_to_user(child,
774 task_user_regset_view(current),
776 0, sizeof(struct user_regs_struct),
779 case PTRACE_SETREGS: /* Set all gp regs in the child. */
780 return copy_regset_from_user(child,
781 task_user_regset_view(current),
783 0, sizeof(struct user_regs_struct),
786 case PTRACE_GETFPREGS: /* Get the child FPU state. */
787 return copy_regset_to_user(child,
788 task_user_regset_view(current),
790 0, sizeof(struct user_i387_struct),
793 case PTRACE_SETFPREGS: /* Set the child FPU state. */
794 return copy_regset_from_user(child,
795 task_user_regset_view(current),
797 0, sizeof(struct user_i387_struct),
801 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
802 return copy_regset_to_user(child, &user_x86_32_view,
804 0, sizeof(struct user_fxsr_struct),
807 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
808 return copy_regset_from_user(child, &user_x86_32_view,
810 0, sizeof(struct user_fxsr_struct),
814 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
815 case PTRACE_GET_THREAD_AREA:
818 ret = do_get_thread_area(child, addr,
819 (struct user_desc __user *)data);
822 case PTRACE_SET_THREAD_AREA:
825 ret = do_set_thread_area(child, addr,
826 (struct user_desc __user *)data, 0);
831 /* normal 64bit interface to access TLS data.
832 Works just like arch_prctl, except that the arguments
834 case PTRACE_ARCH_PRCTL:
835 ret = do_arch_prctl_64(child, data, addr);
840 ret = ptrace_request(child, request, addr, data);
847 #ifdef CONFIG_IA32_EMULATION
849 #include <linux/compat.h>
850 #include <linux/syscalls.h>
851 #include <asm/ia32.h>
852 #include <asm/user32.h>
855 case offsetof(struct user32, regs.l): \
856 regs->q = value; break
859 case offsetof(struct user32, regs.rs): \
860 return set_segment_reg(child, \
861 offsetof(struct user_regs_struct, rs), \
865 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
867 struct pt_regs *regs = task_pt_regs(child);
888 case offsetof(struct user32, regs.orig_eax):
890 * Warning: bizarre corner case fixup here. A 32-bit
891 * debugger setting orig_eax to -1 wants to disable
892 * syscall restart. Make sure that the syscall
893 * restart code sign-extends orig_ax. Also make sure
894 * we interpret the -ERESTART* codes correctly if
895 * loaded into regs->ax in case the task is not
896 * actually still sitting at the exit from a 32-bit
897 * syscall with TS_COMPAT still set.
899 regs->orig_ax = value;
900 if (syscall_get_nr(child, regs) >= 0)
901 child->thread_info.status |= TS_I386_REGS_POKED;
904 case offsetof(struct user32, regs.eflags):
905 return set_flags(child, value);
907 case offsetof(struct user32, u_debugreg[0]) ...
908 offsetof(struct user32, u_debugreg[7]):
909 regno -= offsetof(struct user32, u_debugreg[0]);
910 return ptrace_set_debugreg(child, regno / 4, value);
913 if (regno > sizeof(struct user32) || (regno & 3))
917 * Other dummy fields in the virtual user structure
929 case offsetof(struct user32, regs.l): \
930 *val = regs->q; break
933 case offsetof(struct user32, regs.rs): \
934 *val = get_segment_reg(child, \
935 offsetof(struct user_regs_struct, rs)); \
938 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
940 struct pt_regs *regs = task_pt_regs(child);
958 R32(orig_eax, orig_ax);
962 case offsetof(struct user32, regs.eflags):
963 *val = get_flags(child);
966 case offsetof(struct user32, u_debugreg[0]) ...
967 offsetof(struct user32, u_debugreg[7]):
968 regno -= offsetof(struct user32, u_debugreg[0]);
969 *val = ptrace_get_debugreg(child, regno / 4);
973 if (regno > sizeof(struct user32) || (regno & 3))
977 * Other dummy fields in the virtual user structure
989 static int genregs32_get(struct task_struct *target,
990 const struct user_regset *regset,
991 unsigned int pos, unsigned int count,
992 void *kbuf, void __user *ubuf)
995 compat_ulong_t *k = kbuf;
996 while (count >= sizeof(*k)) {
997 getreg32(target, pos, k++);
1002 compat_ulong_t __user *u = ubuf;
1003 while (count >= sizeof(*u)) {
1004 compat_ulong_t word;
1005 getreg32(target, pos, &word);
1006 if (__put_user(word, u++))
1008 count -= sizeof(*u);
1016 static int genregs32_set(struct task_struct *target,
1017 const struct user_regset *regset,
1018 unsigned int pos, unsigned int count,
1019 const void *kbuf, const void __user *ubuf)
1023 const compat_ulong_t *k = kbuf;
1024 while (count >= sizeof(*k) && !ret) {
1025 ret = putreg32(target, pos, *k++);
1026 count -= sizeof(*k);
1030 const compat_ulong_t __user *u = ubuf;
1031 while (count >= sizeof(*u) && !ret) {
1032 compat_ulong_t word;
1033 ret = __get_user(word, u++);
1036 ret = putreg32(target, pos, word);
1037 count -= sizeof(*u);
1044 static long ia32_arch_ptrace(struct task_struct *child, compat_long_t request,
1045 compat_ulong_t caddr, compat_ulong_t cdata)
1047 unsigned long addr = caddr;
1048 unsigned long data = cdata;
1049 void __user *datap = compat_ptr(data);
1054 case PTRACE_PEEKUSR:
1055 ret = getreg32(child, addr, &val);
1057 ret = put_user(val, (__u32 __user *)datap);
1060 case PTRACE_POKEUSR:
1061 ret = putreg32(child, addr, data);
1064 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1065 return copy_regset_to_user(child, &user_x86_32_view,
1067 0, sizeof(struct user_regs_struct32),
1070 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1071 return copy_regset_from_user(child, &user_x86_32_view,
1073 sizeof(struct user_regs_struct32),
1076 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1077 return copy_regset_to_user(child, &user_x86_32_view,
1079 sizeof(struct user_i387_ia32_struct),
1082 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1083 return copy_regset_from_user(
1084 child, &user_x86_32_view, REGSET_FP,
1085 0, sizeof(struct user_i387_ia32_struct), datap);
1087 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1088 return copy_regset_to_user(child, &user_x86_32_view,
1090 sizeof(struct user32_fxsr_struct),
1093 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1094 return copy_regset_from_user(child, &user_x86_32_view,
1096 sizeof(struct user32_fxsr_struct),
1099 case PTRACE_GET_THREAD_AREA:
1100 case PTRACE_SET_THREAD_AREA:
1101 return arch_ptrace(child, request, addr, data);
1104 return compat_ptrace_request(child, request, addr, data);
1109 #endif /* CONFIG_IA32_EMULATION */
1111 #ifdef CONFIG_X86_X32_ABI
1112 static long x32_arch_ptrace(struct task_struct *child,
1113 compat_long_t request, compat_ulong_t caddr,
1114 compat_ulong_t cdata)
1116 unsigned long addr = caddr;
1117 unsigned long data = cdata;
1118 void __user *datap = compat_ptr(data);
1122 /* Read 32bits at location addr in the USER area. Only allow
1123 to return the lower 32bits of segment and debug registers. */
1124 case PTRACE_PEEKUSR: {
1128 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1129 addr < offsetof(struct user_regs_struct, cs))
1132 tmp = 0; /* Default return condition */
1133 if (addr < sizeof(struct user_regs_struct))
1134 tmp = getreg(child, addr);
1135 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1136 addr <= offsetof(struct user, u_debugreg[7])) {
1137 addr -= offsetof(struct user, u_debugreg[0]);
1138 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
1140 ret = put_user(tmp, (__u32 __user *)datap);
1144 /* Write the word at location addr in the USER area. Only allow
1145 to update segment and debug registers with the upper 32bits
1147 case PTRACE_POKEUSR:
1149 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1150 addr < offsetof(struct user_regs_struct, cs))
1153 if (addr < sizeof(struct user_regs_struct))
1154 ret = putreg(child, addr, data);
1155 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1156 addr <= offsetof(struct user, u_debugreg[7])) {
1157 addr -= offsetof(struct user, u_debugreg[0]);
1158 ret = ptrace_set_debugreg(child,
1159 addr / sizeof(data), data);
1163 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1164 return copy_regset_to_user(child,
1165 task_user_regset_view(current),
1167 0, sizeof(struct user_regs_struct),
1170 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1171 return copy_regset_from_user(child,
1172 task_user_regset_view(current),
1174 0, sizeof(struct user_regs_struct),
1177 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1178 return copy_regset_to_user(child,
1179 task_user_regset_view(current),
1181 0, sizeof(struct user_i387_struct),
1184 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1185 return copy_regset_from_user(child,
1186 task_user_regset_view(current),
1188 0, sizeof(struct user_i387_struct),
1192 return compat_ptrace_request(child, request, addr, data);
1199 #ifdef CONFIG_COMPAT
1200 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1201 compat_ulong_t caddr, compat_ulong_t cdata)
1203 #ifdef CONFIG_X86_X32_ABI
1204 if (!in_ia32_syscall())
1205 return x32_arch_ptrace(child, request, caddr, cdata);
1207 #ifdef CONFIG_IA32_EMULATION
1208 return ia32_arch_ptrace(child, request, caddr, cdata);
1213 #endif /* CONFIG_COMPAT */
1215 #ifdef CONFIG_X86_64
1217 static struct user_regset x86_64_regsets[] __ro_after_init = {
1218 [REGSET_GENERAL] = {
1219 .core_note_type = NT_PRSTATUS,
1220 .n = sizeof(struct user_regs_struct) / sizeof(long),
1221 .size = sizeof(long), .align = sizeof(long),
1222 .get = genregs_get, .set = genregs_set
1225 .core_note_type = NT_PRFPREG,
1226 .n = sizeof(struct user_i387_struct) / sizeof(long),
1227 .size = sizeof(long), .align = sizeof(long),
1228 .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set
1231 .core_note_type = NT_X86_XSTATE,
1232 .size = sizeof(u64), .align = sizeof(u64),
1233 .active = xstateregs_active, .get = xstateregs_get,
1234 .set = xstateregs_set
1236 [REGSET_IOPERM64] = {
1237 .core_note_type = NT_386_IOPERM,
1238 .n = IO_BITMAP_LONGS,
1239 .size = sizeof(long), .align = sizeof(long),
1240 .active = ioperm_active, .get = ioperm_get
1244 static const struct user_regset_view user_x86_64_view = {
1245 .name = "x86_64", .e_machine = EM_X86_64,
1246 .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1249 #else /* CONFIG_X86_32 */
1251 #define user_regs_struct32 user_regs_struct
1252 #define genregs32_get genregs_get
1253 #define genregs32_set genregs_set
1255 #endif /* CONFIG_X86_64 */
1257 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1258 static struct user_regset x86_32_regsets[] __ro_after_init = {
1259 [REGSET_GENERAL] = {
1260 .core_note_type = NT_PRSTATUS,
1261 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1262 .size = sizeof(u32), .align = sizeof(u32),
1263 .get = genregs32_get, .set = genregs32_set
1266 .core_note_type = NT_PRFPREG,
1267 .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32),
1268 .size = sizeof(u32), .align = sizeof(u32),
1269 .active = regset_fpregs_active, .get = fpregs_get, .set = fpregs_set
1272 .core_note_type = NT_PRXFPREG,
1273 .n = sizeof(struct user32_fxsr_struct) / sizeof(u32),
1274 .size = sizeof(u32), .align = sizeof(u32),
1275 .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set
1278 .core_note_type = NT_X86_XSTATE,
1279 .size = sizeof(u64), .align = sizeof(u64),
1280 .active = xstateregs_active, .get = xstateregs_get,
1281 .set = xstateregs_set
1284 .core_note_type = NT_386_TLS,
1285 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1286 .size = sizeof(struct user_desc),
1287 .align = sizeof(struct user_desc),
1288 .active = regset_tls_active,
1289 .get = regset_tls_get, .set = regset_tls_set
1291 [REGSET_IOPERM32] = {
1292 .core_note_type = NT_386_IOPERM,
1293 .n = IO_BITMAP_BYTES / sizeof(u32),
1294 .size = sizeof(u32), .align = sizeof(u32),
1295 .active = ioperm_active, .get = ioperm_get
1299 static const struct user_regset_view user_x86_32_view = {
1300 .name = "i386", .e_machine = EM_386,
1301 .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1306 * This represents bytes 464..511 in the memory layout exported through
1307 * the REGSET_XSTATE interface.
1309 u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
1311 void __init update_regset_xstate_info(unsigned int size, u64 xstate_mask)
1313 #ifdef CONFIG_X86_64
1314 x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1316 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1317 x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1319 xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask;
1322 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1324 #ifdef CONFIG_IA32_EMULATION
1325 if (!user_64bit_mode(task_pt_regs(task)))
1327 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1328 return &user_x86_32_view;
1330 #ifdef CONFIG_X86_64
1331 return &user_x86_64_view;
1335 void send_sigtrap(struct pt_regs *regs, int error_code, int si_code)
1337 struct task_struct *tsk = current;
1339 tsk->thread.trap_nr = X86_TRAP_DB;
1340 tsk->thread.error_code = error_code;
1342 /* Send us the fake SIGTRAP */
1343 force_sig_fault(SIGTRAP, si_code,
1344 user_mode(regs) ? (void __user *)regs->ip : NULL);
1347 void user_single_step_report(struct pt_regs *regs)
1349 send_sigtrap(regs, 0, TRAP_BRKPT);