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))
206 *pt_regs_access(task_pt_regs(task), offset) = value;
209 case offsetof(struct user_regs_struct, gs):
211 set_user_gs(task_pt_regs(task), value);
213 task_user_gs(task) = value;
219 #else /* CONFIG_X86_64 */
221 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
223 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
225 BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
226 return ®s->r15 + (offset / sizeof(regs->r15));
229 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
232 * Returning the value truncates it to 16 bits.
237 case offsetof(struct user_regs_struct, fs):
238 if (task == current) {
239 /* Older gas can't assemble movq %?s,%r?? */
240 asm("movl %%fs,%0" : "=r" (seg));
243 return task->thread.fsindex;
244 case offsetof(struct user_regs_struct, gs):
245 if (task == current) {
246 asm("movl %%gs,%0" : "=r" (seg));
249 return task->thread.gsindex;
250 case offsetof(struct user_regs_struct, ds):
251 if (task == current) {
252 asm("movl %%ds,%0" : "=r" (seg));
255 return task->thread.ds;
256 case offsetof(struct user_regs_struct, es):
257 if (task == current) {
258 asm("movl %%es,%0" : "=r" (seg));
261 return task->thread.es;
263 case offsetof(struct user_regs_struct, cs):
264 case offsetof(struct user_regs_struct, ss):
267 return *pt_regs_access(task_pt_regs(task), offset);
270 static int set_segment_reg(struct task_struct *task,
271 unsigned long offset, u16 value)
274 * The value argument was already truncated to 16 bits.
276 if (invalid_selector(value))
280 case offsetof(struct user_regs_struct,fs):
281 task->thread.fsindex = value;
283 loadsegment(fs, task->thread.fsindex);
285 case offsetof(struct user_regs_struct,gs):
286 task->thread.gsindex = value;
288 load_gs_index(task->thread.gsindex);
290 case offsetof(struct user_regs_struct,ds):
291 task->thread.ds = value;
293 loadsegment(ds, task->thread.ds);
295 case offsetof(struct user_regs_struct,es):
296 task->thread.es = value;
298 loadsegment(es, task->thread.es);
302 * Can't actually change these in 64-bit mode.
304 case offsetof(struct user_regs_struct,cs):
305 if (unlikely(value == 0))
307 task_pt_regs(task)->cs = value;
309 case offsetof(struct user_regs_struct,ss):
310 if (unlikely(value == 0))
312 task_pt_regs(task)->ss = value;
319 #endif /* CONFIG_X86_32 */
321 static unsigned long get_flags(struct task_struct *task)
323 unsigned long retval = task_pt_regs(task)->flags;
326 * If the debugger set TF, hide it from the readout.
328 if (test_tsk_thread_flag(task, TIF_FORCED_TF))
329 retval &= ~X86_EFLAGS_TF;
334 static int set_flags(struct task_struct *task, unsigned long value)
336 struct pt_regs *regs = task_pt_regs(task);
339 * If the user value contains TF, mark that
340 * it was not "us" (the debugger) that set it.
341 * If not, make sure it stays set if we had.
343 if (value & X86_EFLAGS_TF)
344 clear_tsk_thread_flag(task, TIF_FORCED_TF);
345 else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
346 value |= X86_EFLAGS_TF;
348 regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
353 static int putreg(struct task_struct *child,
354 unsigned long offset, unsigned long value)
357 case offsetof(struct user_regs_struct, cs):
358 case offsetof(struct user_regs_struct, ds):
359 case offsetof(struct user_regs_struct, es):
360 case offsetof(struct user_regs_struct, fs):
361 case offsetof(struct user_regs_struct, gs):
362 case offsetof(struct user_regs_struct, ss):
363 return set_segment_reg(child, offset, value);
365 case offsetof(struct user_regs_struct, flags):
366 return set_flags(child, value);
369 case offsetof(struct user_regs_struct,fs_base):
370 if (value >= TASK_SIZE_MAX)
373 * When changing the FS base, use do_arch_prctl_64()
374 * to set the index to zero and to set the base
377 if (child->thread.fsbase != value)
378 return do_arch_prctl_64(child, ARCH_SET_FS, value);
380 case offsetof(struct user_regs_struct,gs_base):
382 * Exactly the same here as the %fs handling above.
384 if (value >= TASK_SIZE_MAX)
386 if (child->thread.gsbase != value)
387 return do_arch_prctl_64(child, ARCH_SET_GS, value);
392 *pt_regs_access(task_pt_regs(child), offset) = value;
396 static unsigned long getreg(struct task_struct *task, unsigned long offset)
399 case offsetof(struct user_regs_struct, cs):
400 case offsetof(struct user_regs_struct, ds):
401 case offsetof(struct user_regs_struct, es):
402 case offsetof(struct user_regs_struct, fs):
403 case offsetof(struct user_regs_struct, gs):
404 case offsetof(struct user_regs_struct, ss):
405 return get_segment_reg(task, offset);
407 case offsetof(struct user_regs_struct, flags):
408 return get_flags(task);
411 case offsetof(struct user_regs_struct, fs_base):
412 return x86_fsbase_read_task(task);
413 case offsetof(struct user_regs_struct, gs_base):
414 return x86_gsbase_read_task(task);
418 return *pt_regs_access(task_pt_regs(task), offset);
421 static int genregs_get(struct task_struct *target,
422 const struct user_regset *regset,
423 unsigned int pos, unsigned int count,
424 void *kbuf, void __user *ubuf)
427 unsigned long *k = kbuf;
428 while (count >= sizeof(*k)) {
429 *k++ = getreg(target, pos);
434 unsigned long __user *u = ubuf;
435 while (count >= sizeof(*u)) {
436 if (__put_user(getreg(target, pos), u++))
446 static int genregs_set(struct task_struct *target,
447 const struct user_regset *regset,
448 unsigned int pos, unsigned int count,
449 const void *kbuf, const void __user *ubuf)
453 const unsigned long *k = kbuf;
454 while (count >= sizeof(*k) && !ret) {
455 ret = putreg(target, pos, *k++);
460 const unsigned long __user *u = ubuf;
461 while (count >= sizeof(*u) && !ret) {
463 ret = __get_user(word, u++);
466 ret = putreg(target, pos, word);
474 static void ptrace_triggered(struct perf_event *bp,
475 struct perf_sample_data *data,
476 struct pt_regs *regs)
479 struct thread_struct *thread = &(current->thread);
482 * Store in the virtual DR6 register the fact that the breakpoint
483 * was hit so the thread's debugger will see it.
485 for (i = 0; i < HBP_NUM; i++) {
486 if (thread->ptrace_bps[i] == bp)
490 thread->debugreg6 |= (DR_TRAP0 << i);
494 * Walk through every ptrace breakpoints for this thread and
495 * build the dr7 value on top of their attributes.
498 static unsigned long ptrace_get_dr7(struct perf_event *bp[])
502 struct arch_hw_breakpoint *info;
504 for (i = 0; i < HBP_NUM; i++) {
505 if (bp[i] && !bp[i]->attr.disabled) {
506 info = counter_arch_bp(bp[i]);
507 dr7 |= encode_dr7(i, info->len, info->type);
514 static int ptrace_fill_bp_fields(struct perf_event_attr *attr,
515 int len, int type, bool disabled)
517 int err, bp_len, bp_type;
519 err = arch_bp_generic_fields(len, type, &bp_len, &bp_type);
521 attr->bp_len = bp_len;
522 attr->bp_type = bp_type;
523 attr->disabled = disabled;
529 static struct perf_event *
530 ptrace_register_breakpoint(struct task_struct *tsk, int len, int type,
531 unsigned long addr, bool disabled)
533 struct perf_event_attr attr;
536 ptrace_breakpoint_init(&attr);
539 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
543 return register_user_hw_breakpoint(&attr, ptrace_triggered,
547 static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type,
550 struct perf_event_attr attr = bp->attr;
553 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
557 return modify_user_hw_breakpoint(bp, &attr);
561 * Handle ptrace writes to debug register 7.
563 static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data)
565 struct thread_struct *thread = &tsk->thread;
566 unsigned long old_dr7;
567 bool second_pass = false;
570 data &= ~DR_CONTROL_RESERVED;
571 old_dr7 = ptrace_get_dr7(thread->ptrace_bps);
575 for (i = 0; i < HBP_NUM; i++) {
577 bool disabled = !decode_dr7(data, i, &len, &type);
578 struct perf_event *bp = thread->ptrace_bps[i];
584 bp = ptrace_register_breakpoint(tsk,
585 len, type, 0, disabled);
591 thread->ptrace_bps[i] = bp;
595 rc = ptrace_modify_breakpoint(bp, len, type, disabled);
600 /* Restore if the first pass failed, second_pass shouldn't fail. */
601 if (rc && !WARN_ON(second_pass)) {
612 * Handle PTRACE_PEEKUSR calls for the debug register area.
614 static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
616 struct thread_struct *thread = &tsk->thread;
617 unsigned long val = 0;
620 int index = array_index_nospec(n, HBP_NUM);
621 struct perf_event *bp = thread->ptrace_bps[index];
624 val = bp->hw.info.address;
626 val = thread->debugreg6;
628 val = thread->ptrace_dr7;
633 static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr,
636 struct thread_struct *t = &tsk->thread;
637 struct perf_event *bp = t->ptrace_bps[nr];
642 * Put stub len and type to create an inactive but correct bp.
644 * CHECKME: the previous code returned -EIO if the addr wasn't
645 * a valid task virtual addr. The new one will return -EINVAL in
647 * -EINVAL may be what we want for in-kernel breakpoints users,
648 * but -EIO looks better for ptrace, since we refuse a register
649 * writing for the user. And anyway this is the previous
652 bp = ptrace_register_breakpoint(tsk,
653 X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE,
658 t->ptrace_bps[nr] = bp;
660 struct perf_event_attr attr = bp->attr;
663 err = modify_user_hw_breakpoint(bp, &attr);
670 * Handle PTRACE_POKEUSR calls for the debug register area.
672 static int ptrace_set_debugreg(struct task_struct *tsk, int n,
675 struct thread_struct *thread = &tsk->thread;
676 /* There are no DR4 or DR5 registers */
680 rc = ptrace_set_breakpoint_addr(tsk, n, val);
682 thread->debugreg6 = val;
685 rc = ptrace_write_dr7(tsk, val);
687 thread->ptrace_dr7 = val;
693 * These access the current or another (stopped) task's io permission
694 * bitmap for debugging or core dump.
696 static int ioperm_active(struct task_struct *target,
697 const struct user_regset *regset)
699 return target->thread.io_bitmap_max / regset->size;
702 static int ioperm_get(struct task_struct *target,
703 const struct user_regset *regset,
704 unsigned int pos, unsigned int count,
705 void *kbuf, void __user *ubuf)
707 if (!target->thread.io_bitmap_ptr)
710 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
711 target->thread.io_bitmap_ptr,
716 * Called by kernel/ptrace.c when detaching..
718 * Make sure the single step bit is not set.
720 void ptrace_disable(struct task_struct *child)
722 user_disable_single_step(child);
725 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
726 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
729 long arch_ptrace(struct task_struct *child, long request,
730 unsigned long addr, unsigned long data)
733 unsigned long __user *datap = (unsigned long __user *)data;
736 /* read the word at location addr in the USER area. */
737 case PTRACE_PEEKUSR: {
741 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
744 tmp = 0; /* Default return condition */
745 if (addr < sizeof(struct user_regs_struct))
746 tmp = getreg(child, addr);
747 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
748 addr <= offsetof(struct user, u_debugreg[7])) {
749 addr -= offsetof(struct user, u_debugreg[0]);
750 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
752 ret = put_user(tmp, datap);
756 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
758 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
761 if (addr < sizeof(struct user_regs_struct))
762 ret = putreg(child, addr, data);
763 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
764 addr <= offsetof(struct user, u_debugreg[7])) {
765 addr -= offsetof(struct user, u_debugreg[0]);
766 ret = ptrace_set_debugreg(child,
767 addr / sizeof(data), data);
771 case PTRACE_GETREGS: /* Get all gp regs from the child. */
772 return copy_regset_to_user(child,
773 task_user_regset_view(current),
775 0, sizeof(struct user_regs_struct),
778 case PTRACE_SETREGS: /* Set all gp regs in the child. */
779 return copy_regset_from_user(child,
780 task_user_regset_view(current),
782 0, sizeof(struct user_regs_struct),
785 case PTRACE_GETFPREGS: /* Get the child FPU state. */
786 return copy_regset_to_user(child,
787 task_user_regset_view(current),
789 0, sizeof(struct user_i387_struct),
792 case PTRACE_SETFPREGS: /* Set the child FPU state. */
793 return copy_regset_from_user(child,
794 task_user_regset_view(current),
796 0, sizeof(struct user_i387_struct),
800 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
801 return copy_regset_to_user(child, &user_x86_32_view,
803 0, sizeof(struct user_fxsr_struct),
806 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
807 return copy_regset_from_user(child, &user_x86_32_view,
809 0, sizeof(struct user_fxsr_struct),
813 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
814 case PTRACE_GET_THREAD_AREA:
817 ret = do_get_thread_area(child, addr,
818 (struct user_desc __user *)data);
821 case PTRACE_SET_THREAD_AREA:
824 ret = do_set_thread_area(child, addr,
825 (struct user_desc __user *)data, 0);
830 /* normal 64bit interface to access TLS data.
831 Works just like arch_prctl, except that the arguments
833 case PTRACE_ARCH_PRCTL:
834 ret = do_arch_prctl_64(child, data, addr);
839 ret = ptrace_request(child, request, addr, data);
846 #ifdef CONFIG_IA32_EMULATION
848 #include <linux/compat.h>
849 #include <linux/syscalls.h>
850 #include <asm/ia32.h>
851 #include <asm/user32.h>
854 case offsetof(struct user32, regs.l): \
855 regs->q = value; break
858 case offsetof(struct user32, regs.rs): \
859 return set_segment_reg(child, \
860 offsetof(struct user_regs_struct, rs), \
864 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
866 struct pt_regs *regs = task_pt_regs(child);
887 case offsetof(struct user32, regs.orig_eax):
889 * Warning: bizarre corner case fixup here. A 32-bit
890 * debugger setting orig_eax to -1 wants to disable
891 * syscall restart. Make sure that the syscall
892 * restart code sign-extends orig_ax. Also make sure
893 * we interpret the -ERESTART* codes correctly if
894 * loaded into regs->ax in case the task is not
895 * actually still sitting at the exit from a 32-bit
896 * syscall with TS_COMPAT still set.
898 regs->orig_ax = value;
899 if (syscall_get_nr(child, regs) >= 0)
900 child->thread_info.status |= TS_I386_REGS_POKED;
903 case offsetof(struct user32, regs.eflags):
904 return set_flags(child, value);
906 case offsetof(struct user32, u_debugreg[0]) ...
907 offsetof(struct user32, u_debugreg[7]):
908 regno -= offsetof(struct user32, u_debugreg[0]);
909 return ptrace_set_debugreg(child, regno / 4, value);
912 if (regno > sizeof(struct user32) || (regno & 3))
916 * Other dummy fields in the virtual user structure
928 case offsetof(struct user32, regs.l): \
929 *val = regs->q; break
932 case offsetof(struct user32, regs.rs): \
933 *val = get_segment_reg(child, \
934 offsetof(struct user_regs_struct, rs)); \
937 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
939 struct pt_regs *regs = task_pt_regs(child);
957 R32(orig_eax, orig_ax);
961 case offsetof(struct user32, regs.eflags):
962 *val = get_flags(child);
965 case offsetof(struct user32, u_debugreg[0]) ...
966 offsetof(struct user32, u_debugreg[7]):
967 regno -= offsetof(struct user32, u_debugreg[0]);
968 *val = ptrace_get_debugreg(child, regno / 4);
972 if (regno > sizeof(struct user32) || (regno & 3))
976 * Other dummy fields in the virtual user structure
988 static int genregs32_get(struct task_struct *target,
989 const struct user_regset *regset,
990 unsigned int pos, unsigned int count,
991 void *kbuf, void __user *ubuf)
994 compat_ulong_t *k = kbuf;
995 while (count >= sizeof(*k)) {
996 getreg32(target, pos, k++);
1001 compat_ulong_t __user *u = ubuf;
1002 while (count >= sizeof(*u)) {
1003 compat_ulong_t word;
1004 getreg32(target, pos, &word);
1005 if (__put_user(word, u++))
1007 count -= sizeof(*u);
1015 static int genregs32_set(struct task_struct *target,
1016 const struct user_regset *regset,
1017 unsigned int pos, unsigned int count,
1018 const void *kbuf, const void __user *ubuf)
1022 const compat_ulong_t *k = kbuf;
1023 while (count >= sizeof(*k) && !ret) {
1024 ret = putreg32(target, pos, *k++);
1025 count -= sizeof(*k);
1029 const compat_ulong_t __user *u = ubuf;
1030 while (count >= sizeof(*u) && !ret) {
1031 compat_ulong_t word;
1032 ret = __get_user(word, u++);
1035 ret = putreg32(target, pos, word);
1036 count -= sizeof(*u);
1043 static long ia32_arch_ptrace(struct task_struct *child, compat_long_t request,
1044 compat_ulong_t caddr, compat_ulong_t cdata)
1046 unsigned long addr = caddr;
1047 unsigned long data = cdata;
1048 void __user *datap = compat_ptr(data);
1053 case PTRACE_PEEKUSR:
1054 ret = getreg32(child, addr, &val);
1056 ret = put_user(val, (__u32 __user *)datap);
1059 case PTRACE_POKEUSR:
1060 ret = putreg32(child, addr, data);
1063 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1064 return copy_regset_to_user(child, &user_x86_32_view,
1066 0, sizeof(struct user_regs_struct32),
1069 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1070 return copy_regset_from_user(child, &user_x86_32_view,
1072 sizeof(struct user_regs_struct32),
1075 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1076 return copy_regset_to_user(child, &user_x86_32_view,
1078 sizeof(struct user_i387_ia32_struct),
1081 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1082 return copy_regset_from_user(
1083 child, &user_x86_32_view, REGSET_FP,
1084 0, sizeof(struct user_i387_ia32_struct), datap);
1086 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1087 return copy_regset_to_user(child, &user_x86_32_view,
1089 sizeof(struct user32_fxsr_struct),
1092 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1093 return copy_regset_from_user(child, &user_x86_32_view,
1095 sizeof(struct user32_fxsr_struct),
1098 case PTRACE_GET_THREAD_AREA:
1099 case PTRACE_SET_THREAD_AREA:
1100 return arch_ptrace(child, request, addr, data);
1103 return compat_ptrace_request(child, request, addr, data);
1108 #endif /* CONFIG_IA32_EMULATION */
1110 #ifdef CONFIG_X86_X32_ABI
1111 static long x32_arch_ptrace(struct task_struct *child,
1112 compat_long_t request, compat_ulong_t caddr,
1113 compat_ulong_t cdata)
1115 unsigned long addr = caddr;
1116 unsigned long data = cdata;
1117 void __user *datap = compat_ptr(data);
1121 /* Read 32bits at location addr in the USER area. Only allow
1122 to return the lower 32bits of segment and debug registers. */
1123 case PTRACE_PEEKUSR: {
1127 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1128 addr < offsetof(struct user_regs_struct, cs))
1131 tmp = 0; /* Default return condition */
1132 if (addr < sizeof(struct user_regs_struct))
1133 tmp = getreg(child, addr);
1134 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1135 addr <= offsetof(struct user, u_debugreg[7])) {
1136 addr -= offsetof(struct user, u_debugreg[0]);
1137 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
1139 ret = put_user(tmp, (__u32 __user *)datap);
1143 /* Write the word at location addr in the USER area. Only allow
1144 to update segment and debug registers with the upper 32bits
1146 case PTRACE_POKEUSR:
1148 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1149 addr < offsetof(struct user_regs_struct, cs))
1152 if (addr < sizeof(struct user_regs_struct))
1153 ret = putreg(child, addr, data);
1154 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1155 addr <= offsetof(struct user, u_debugreg[7])) {
1156 addr -= offsetof(struct user, u_debugreg[0]);
1157 ret = ptrace_set_debugreg(child,
1158 addr / sizeof(data), data);
1162 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1163 return copy_regset_to_user(child,
1164 task_user_regset_view(current),
1166 0, sizeof(struct user_regs_struct),
1169 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1170 return copy_regset_from_user(child,
1171 task_user_regset_view(current),
1173 0, sizeof(struct user_regs_struct),
1176 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1177 return copy_regset_to_user(child,
1178 task_user_regset_view(current),
1180 0, sizeof(struct user_i387_struct),
1183 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1184 return copy_regset_from_user(child,
1185 task_user_regset_view(current),
1187 0, sizeof(struct user_i387_struct),
1191 return compat_ptrace_request(child, request, addr, data);
1198 #ifdef CONFIG_COMPAT
1199 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1200 compat_ulong_t caddr, compat_ulong_t cdata)
1202 #ifdef CONFIG_X86_X32_ABI
1203 if (!in_ia32_syscall())
1204 return x32_arch_ptrace(child, request, caddr, cdata);
1206 #ifdef CONFIG_IA32_EMULATION
1207 return ia32_arch_ptrace(child, request, caddr, cdata);
1212 #endif /* CONFIG_COMPAT */
1214 #ifdef CONFIG_X86_64
1216 static struct user_regset x86_64_regsets[] __ro_after_init = {
1217 [REGSET_GENERAL] = {
1218 .core_note_type = NT_PRSTATUS,
1219 .n = sizeof(struct user_regs_struct) / sizeof(long),
1220 .size = sizeof(long), .align = sizeof(long),
1221 .get = genregs_get, .set = genregs_set
1224 .core_note_type = NT_PRFPREG,
1225 .n = sizeof(struct user_i387_struct) / sizeof(long),
1226 .size = sizeof(long), .align = sizeof(long),
1227 .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set
1230 .core_note_type = NT_X86_XSTATE,
1231 .size = sizeof(u64), .align = sizeof(u64),
1232 .active = xstateregs_active, .get = xstateregs_get,
1233 .set = xstateregs_set
1235 [REGSET_IOPERM64] = {
1236 .core_note_type = NT_386_IOPERM,
1237 .n = IO_BITMAP_LONGS,
1238 .size = sizeof(long), .align = sizeof(long),
1239 .active = ioperm_active, .get = ioperm_get
1243 static const struct user_regset_view user_x86_64_view = {
1244 .name = "x86_64", .e_machine = EM_X86_64,
1245 .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1248 #else /* CONFIG_X86_32 */
1250 #define user_regs_struct32 user_regs_struct
1251 #define genregs32_get genregs_get
1252 #define genregs32_set genregs_set
1254 #endif /* CONFIG_X86_64 */
1256 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1257 static struct user_regset x86_32_regsets[] __ro_after_init = {
1258 [REGSET_GENERAL] = {
1259 .core_note_type = NT_PRSTATUS,
1260 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1261 .size = sizeof(u32), .align = sizeof(u32),
1262 .get = genregs32_get, .set = genregs32_set
1265 .core_note_type = NT_PRFPREG,
1266 .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32),
1267 .size = sizeof(u32), .align = sizeof(u32),
1268 .active = regset_fpregs_active, .get = fpregs_get, .set = fpregs_set
1271 .core_note_type = NT_PRXFPREG,
1272 .n = sizeof(struct user32_fxsr_struct) / sizeof(u32),
1273 .size = sizeof(u32), .align = sizeof(u32),
1274 .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set
1277 .core_note_type = NT_X86_XSTATE,
1278 .size = sizeof(u64), .align = sizeof(u64),
1279 .active = xstateregs_active, .get = xstateregs_get,
1280 .set = xstateregs_set
1283 .core_note_type = NT_386_TLS,
1284 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1285 .size = sizeof(struct user_desc),
1286 .align = sizeof(struct user_desc),
1287 .active = regset_tls_active,
1288 .get = regset_tls_get, .set = regset_tls_set
1290 [REGSET_IOPERM32] = {
1291 .core_note_type = NT_386_IOPERM,
1292 .n = IO_BITMAP_BYTES / sizeof(u32),
1293 .size = sizeof(u32), .align = sizeof(u32),
1294 .active = ioperm_active, .get = ioperm_get
1298 static const struct user_regset_view user_x86_32_view = {
1299 .name = "i386", .e_machine = EM_386,
1300 .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1305 * This represents bytes 464..511 in the memory layout exported through
1306 * the REGSET_XSTATE interface.
1308 u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
1310 void __init update_regset_xstate_info(unsigned int size, u64 xstate_mask)
1312 #ifdef CONFIG_X86_64
1313 x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1315 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1316 x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1318 xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask;
1321 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1323 #ifdef CONFIG_IA32_EMULATION
1324 if (!user_64bit_mode(task_pt_regs(task)))
1326 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1327 return &user_x86_32_view;
1329 #ifdef CONFIG_X86_64
1330 return &user_x86_64_view;
1334 void send_sigtrap(struct pt_regs *regs, int error_code, int si_code)
1336 struct task_struct *tsk = current;
1338 tsk->thread.trap_nr = X86_TRAP_DB;
1339 tsk->thread.error_code = error_code;
1341 /* Send us the fake SIGTRAP */
1342 force_sig_fault(SIGTRAP, si_code,
1343 user_mode(regs) ? (void __user *)regs->ip : NULL);
1346 void user_single_step_report(struct pt_regs *regs)
1348 send_sigtrap(regs, 0, TRAP_BRKPT);