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/processor.h>
32 #include <asm/fpu/internal.h>
33 #include <asm/fpu/signal.h>
34 #include <asm/fpu/regset.h>
35 #include <asm/debugreg.h>
38 #include <asm/prctl.h>
39 #include <asm/proto.h>
40 #include <asm/hw_breakpoint.h>
41 #include <asm/traps.h>
42 #include <asm/syscall.h>
43 #include <asm/fsgsbase.h>
44 #include <asm/io_bitmap.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)
184 if (WARN_ON_ONCE(task == current))
188 * The value argument was already truncated to 16 bits.
190 if (invalid_selector(value))
194 * For %cs and %ss we cannot permit a null selector.
195 * We can permit a bogus selector as long as it has USER_RPL.
196 * Null selectors are fine for other segment registers, but
197 * we will never get back to user mode with invalid %cs or %ss
198 * and will take the trap in iret instead. Much code relies
199 * on user_mode() to distinguish a user trap frame (which can
200 * safely use invalid selectors) from a kernel trap frame.
203 case offsetof(struct user_regs_struct, cs):
204 case offsetof(struct user_regs_struct, ss):
205 if (unlikely(value == 0))
210 *pt_regs_access(task_pt_regs(task), offset) = value;
213 case offsetof(struct user_regs_struct, gs):
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)
274 if (WARN_ON_ONCE(task == current))
278 * The value argument was already truncated to 16 bits.
280 if (invalid_selector(value))
284 * Writes to FS and GS will change the stored selector. Whether
285 * this changes the segment base as well depends on whether
286 * FSGSBASE is enabled.
290 case offsetof(struct user_regs_struct,fs):
291 task->thread.fsindex = value;
293 case offsetof(struct user_regs_struct,gs):
294 task->thread.gsindex = value;
296 case offsetof(struct user_regs_struct,ds):
297 task->thread.ds = value;
299 case offsetof(struct user_regs_struct,es):
300 task->thread.es = value;
304 * Can't actually change these in 64-bit mode.
306 case offsetof(struct user_regs_struct,cs):
307 if (unlikely(value == 0))
309 task_pt_regs(task)->cs = value;
311 case offsetof(struct user_regs_struct,ss):
312 if (unlikely(value == 0))
314 task_pt_regs(task)->ss = value;
321 #endif /* CONFIG_X86_32 */
323 static unsigned long get_flags(struct task_struct *task)
325 unsigned long retval = task_pt_regs(task)->flags;
328 * If the debugger set TF, hide it from the readout.
330 if (test_tsk_thread_flag(task, TIF_FORCED_TF))
331 retval &= ~X86_EFLAGS_TF;
336 static int set_flags(struct task_struct *task, unsigned long value)
338 struct pt_regs *regs = task_pt_regs(task);
341 * If the user value contains TF, mark that
342 * it was not "us" (the debugger) that set it.
343 * If not, make sure it stays set if we had.
345 if (value & X86_EFLAGS_TF)
346 clear_tsk_thread_flag(task, TIF_FORCED_TF);
347 else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
348 value |= X86_EFLAGS_TF;
350 regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
355 static int putreg(struct task_struct *child,
356 unsigned long offset, unsigned long value)
359 case offsetof(struct user_regs_struct, cs):
360 case offsetof(struct user_regs_struct, ds):
361 case offsetof(struct user_regs_struct, es):
362 case offsetof(struct user_regs_struct, fs):
363 case offsetof(struct user_regs_struct, gs):
364 case offsetof(struct user_regs_struct, ss):
365 return set_segment_reg(child, offset, value);
367 case offsetof(struct user_regs_struct, flags):
368 return set_flags(child, value);
371 case offsetof(struct user_regs_struct,fs_base):
372 if (value >= TASK_SIZE_MAX)
374 x86_fsbase_write_task(child, value);
376 case offsetof(struct user_regs_struct,gs_base):
377 if (value >= TASK_SIZE_MAX)
379 x86_gsbase_write_task(child, value);
384 *pt_regs_access(task_pt_regs(child), offset) = value;
388 static unsigned long getreg(struct task_struct *task, unsigned long offset)
391 case offsetof(struct user_regs_struct, cs):
392 case offsetof(struct user_regs_struct, ds):
393 case offsetof(struct user_regs_struct, es):
394 case offsetof(struct user_regs_struct, fs):
395 case offsetof(struct user_regs_struct, gs):
396 case offsetof(struct user_regs_struct, ss):
397 return get_segment_reg(task, offset);
399 case offsetof(struct user_regs_struct, flags):
400 return get_flags(task);
403 case offsetof(struct user_regs_struct, fs_base):
404 return x86_fsbase_read_task(task);
405 case offsetof(struct user_regs_struct, gs_base):
406 return x86_gsbase_read_task(task);
410 return *pt_regs_access(task_pt_regs(task), offset);
413 static int genregs_get(struct task_struct *target,
414 const struct user_regset *regset,
419 for (reg = 0; to.left; reg++)
420 membuf_store(&to, getreg(target, reg * sizeof(unsigned long)));
424 static int genregs_set(struct task_struct *target,
425 const struct user_regset *regset,
426 unsigned int pos, unsigned int count,
427 const void *kbuf, const void __user *ubuf)
431 const unsigned long *k = kbuf;
432 while (count >= sizeof(*k) && !ret) {
433 ret = putreg(target, pos, *k++);
438 const unsigned long __user *u = ubuf;
439 while (count >= sizeof(*u) && !ret) {
441 ret = __get_user(word, u++);
444 ret = putreg(target, pos, word);
452 static void ptrace_triggered(struct perf_event *bp,
453 struct perf_sample_data *data,
454 struct pt_regs *regs)
457 struct thread_struct *thread = &(current->thread);
460 * Store in the virtual DR6 register the fact that the breakpoint
461 * was hit so the thread's debugger will see it.
463 for (i = 0; i < HBP_NUM; i++) {
464 if (thread->ptrace_bps[i] == bp)
468 thread->virtual_dr6 |= (DR_TRAP0 << i);
472 * Walk through every ptrace breakpoints for this thread and
473 * build the dr7 value on top of their attributes.
476 static unsigned long ptrace_get_dr7(struct perf_event *bp[])
480 struct arch_hw_breakpoint *info;
482 for (i = 0; i < HBP_NUM; i++) {
483 if (bp[i] && !bp[i]->attr.disabled) {
484 info = counter_arch_bp(bp[i]);
485 dr7 |= encode_dr7(i, info->len, info->type);
492 static int ptrace_fill_bp_fields(struct perf_event_attr *attr,
493 int len, int type, bool disabled)
495 int err, bp_len, bp_type;
497 err = arch_bp_generic_fields(len, type, &bp_len, &bp_type);
499 attr->bp_len = bp_len;
500 attr->bp_type = bp_type;
501 attr->disabled = disabled;
507 static struct perf_event *
508 ptrace_register_breakpoint(struct task_struct *tsk, int len, int type,
509 unsigned long addr, bool disabled)
511 struct perf_event_attr attr;
514 ptrace_breakpoint_init(&attr);
517 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
521 return register_user_hw_breakpoint(&attr, ptrace_triggered,
525 static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type,
528 struct perf_event_attr attr = bp->attr;
531 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
535 return modify_user_hw_breakpoint(bp, &attr);
539 * Handle ptrace writes to debug register 7.
541 static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data)
543 struct thread_struct *thread = &tsk->thread;
544 unsigned long old_dr7;
545 bool second_pass = false;
548 data &= ~DR_CONTROL_RESERVED;
549 old_dr7 = ptrace_get_dr7(thread->ptrace_bps);
553 for (i = 0; i < HBP_NUM; i++) {
555 bool disabled = !decode_dr7(data, i, &len, &type);
556 struct perf_event *bp = thread->ptrace_bps[i];
562 bp = ptrace_register_breakpoint(tsk,
563 len, type, 0, disabled);
569 thread->ptrace_bps[i] = bp;
573 rc = ptrace_modify_breakpoint(bp, len, type, disabled);
578 /* Restore if the first pass failed, second_pass shouldn't fail. */
579 if (rc && !WARN_ON(second_pass)) {
590 * Handle PTRACE_PEEKUSR calls for the debug register area.
592 static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
594 struct thread_struct *thread = &tsk->thread;
595 unsigned long val = 0;
598 int index = array_index_nospec(n, HBP_NUM);
599 struct perf_event *bp = thread->ptrace_bps[index];
602 val = bp->hw.info.address;
604 val = thread->virtual_dr6 ^ DR6_RESERVED; /* Flip back to arch polarity */
606 val = thread->ptrace_dr7;
611 static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr,
614 struct thread_struct *t = &tsk->thread;
615 struct perf_event *bp = t->ptrace_bps[nr];
620 * Put stub len and type to create an inactive but correct bp.
622 * CHECKME: the previous code returned -EIO if the addr wasn't
623 * a valid task virtual addr. The new one will return -EINVAL in
625 * -EINVAL may be what we want for in-kernel breakpoints users,
626 * but -EIO looks better for ptrace, since we refuse a register
627 * writing for the user. And anyway this is the previous
630 bp = ptrace_register_breakpoint(tsk,
631 X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE,
636 t->ptrace_bps[nr] = bp;
638 struct perf_event_attr attr = bp->attr;
641 err = modify_user_hw_breakpoint(bp, &attr);
648 * Handle PTRACE_POKEUSR calls for the debug register area.
650 static int ptrace_set_debugreg(struct task_struct *tsk, int n,
653 struct thread_struct *thread = &tsk->thread;
654 /* There are no DR4 or DR5 registers */
658 rc = ptrace_set_breakpoint_addr(tsk, n, val);
660 thread->virtual_dr6 = val ^ DR6_RESERVED; /* Flip to positive polarity */
663 rc = ptrace_write_dr7(tsk, val);
665 thread->ptrace_dr7 = val;
671 * These access the current or another (stopped) task's io permission
672 * bitmap for debugging or core dump.
674 static int ioperm_active(struct task_struct *target,
675 const struct user_regset *regset)
677 struct io_bitmap *iobm = target->thread.io_bitmap;
679 return iobm ? DIV_ROUND_UP(iobm->max, regset->size) : 0;
682 static int ioperm_get(struct task_struct *target,
683 const struct user_regset *regset,
686 struct io_bitmap *iobm = target->thread.io_bitmap;
691 return membuf_write(&to, iobm->bitmap, IO_BITMAP_BYTES);
695 * Called by kernel/ptrace.c when detaching..
697 * Make sure the single step bit is not set.
699 void ptrace_disable(struct task_struct *child)
701 user_disable_single_step(child);
704 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
705 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
708 long arch_ptrace(struct task_struct *child, long request,
709 unsigned long addr, unsigned long data)
712 unsigned long __user *datap = (unsigned long __user *)data;
715 /* read the word at location addr in the USER area. */
716 case PTRACE_PEEKUSR: {
720 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
723 tmp = 0; /* Default return condition */
724 if (addr < sizeof(struct user_regs_struct))
725 tmp = getreg(child, addr);
726 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
727 addr <= offsetof(struct user, u_debugreg[7])) {
728 addr -= offsetof(struct user, u_debugreg[0]);
729 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
731 ret = put_user(tmp, datap);
735 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
737 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
740 if (addr < sizeof(struct user_regs_struct))
741 ret = putreg(child, addr, data);
742 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
743 addr <= offsetof(struct user, u_debugreg[7])) {
744 addr -= offsetof(struct user, u_debugreg[0]);
745 ret = ptrace_set_debugreg(child,
746 addr / sizeof(data), data);
750 case PTRACE_GETREGS: /* Get all gp regs from the child. */
751 return copy_regset_to_user(child,
752 task_user_regset_view(current),
754 0, sizeof(struct user_regs_struct),
757 case PTRACE_SETREGS: /* Set all gp regs in the child. */
758 return copy_regset_from_user(child,
759 task_user_regset_view(current),
761 0, sizeof(struct user_regs_struct),
764 case PTRACE_GETFPREGS: /* Get the child FPU state. */
765 return copy_regset_to_user(child,
766 task_user_regset_view(current),
768 0, sizeof(struct user_i387_struct),
771 case PTRACE_SETFPREGS: /* Set the child FPU state. */
772 return copy_regset_from_user(child,
773 task_user_regset_view(current),
775 0, sizeof(struct user_i387_struct),
779 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
780 return copy_regset_to_user(child, &user_x86_32_view,
782 0, sizeof(struct user_fxsr_struct),
785 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
786 return copy_regset_from_user(child, &user_x86_32_view,
788 0, sizeof(struct user_fxsr_struct),
792 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
793 case PTRACE_GET_THREAD_AREA:
796 ret = do_get_thread_area(child, addr,
797 (struct user_desc __user *)data);
800 case PTRACE_SET_THREAD_AREA:
803 ret = do_set_thread_area(child, addr,
804 (struct user_desc __user *)data, 0);
809 /* normal 64bit interface to access TLS data.
810 Works just like arch_prctl, except that the arguments
812 case PTRACE_ARCH_PRCTL:
813 ret = do_arch_prctl_64(child, data, addr);
818 ret = ptrace_request(child, request, addr, data);
825 #ifdef CONFIG_IA32_EMULATION
827 #include <linux/compat.h>
828 #include <linux/syscalls.h>
829 #include <asm/ia32.h>
830 #include <asm/user32.h>
833 case offsetof(struct user32, regs.l): \
834 regs->q = value; break
837 case offsetof(struct user32, regs.rs): \
838 return set_segment_reg(child, \
839 offsetof(struct user_regs_struct, rs), \
843 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
845 struct pt_regs *regs = task_pt_regs(child);
855 * A 32-bit ptracer on a 64-bit kernel expects that writing
856 * FS or GS will also update the base. This is needed for
857 * operations like PTRACE_SETREGS to fully restore a saved
861 case offsetof(struct user32, regs.fs):
862 ret = set_segment_reg(child,
863 offsetof(struct user_regs_struct, fs),
866 child->thread.fsbase =
867 x86_fsgsbase_read_task(child, value);
870 case offsetof(struct user32, regs.gs):
871 ret = set_segment_reg(child,
872 offsetof(struct user_regs_struct, gs),
875 child->thread.gsbase =
876 x86_fsgsbase_read_task(child, value);
891 case offsetof(struct user32, regs.orig_eax):
893 * Warning: bizarre corner case fixup here. A 32-bit
894 * debugger setting orig_eax to -1 wants to disable
895 * syscall restart. Make sure that the syscall
896 * restart code sign-extends orig_ax. Also make sure
897 * we interpret the -ERESTART* codes correctly if
898 * loaded into regs->ax in case the task is not
899 * actually still sitting at the exit from a 32-bit
900 * syscall with TS_COMPAT still set.
902 regs->orig_ax = value;
903 if (syscall_get_nr(child, regs) >= 0)
904 child->thread_info.status |= TS_I386_REGS_POKED;
907 case offsetof(struct user32, regs.eflags):
908 return set_flags(child, value);
910 case offsetof(struct user32, u_debugreg[0]) ...
911 offsetof(struct user32, u_debugreg[7]):
912 regno -= offsetof(struct user32, u_debugreg[0]);
913 return ptrace_set_debugreg(child, regno / 4, value);
916 if (regno > sizeof(struct user32) || (regno & 3))
920 * Other dummy fields in the virtual user structure
932 case offsetof(struct user32, regs.l): \
933 *val = regs->q; break
936 case offsetof(struct user32, regs.rs): \
937 *val = get_segment_reg(child, \
938 offsetof(struct user_regs_struct, rs)); \
941 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
943 struct pt_regs *regs = task_pt_regs(child);
961 R32(orig_eax, orig_ax);
965 case offsetof(struct user32, regs.eflags):
966 *val = get_flags(child);
969 case offsetof(struct user32, u_debugreg[0]) ...
970 offsetof(struct user32, u_debugreg[7]):
971 regno -= offsetof(struct user32, u_debugreg[0]);
972 *val = ptrace_get_debugreg(child, regno / 4);
976 if (regno > sizeof(struct user32) || (regno & 3))
980 * Other dummy fields in the virtual user structure
992 static int genregs32_get(struct task_struct *target,
993 const struct user_regset *regset,
998 for (reg = 0; to.left; reg++) {
1000 getreg32(target, reg * 4, &val);
1001 membuf_store(&to, val);
1006 static int genregs32_set(struct task_struct *target,
1007 const struct user_regset *regset,
1008 unsigned int pos, unsigned int count,
1009 const void *kbuf, const void __user *ubuf)
1013 const compat_ulong_t *k = kbuf;
1014 while (count >= sizeof(*k) && !ret) {
1015 ret = putreg32(target, pos, *k++);
1016 count -= sizeof(*k);
1020 const compat_ulong_t __user *u = ubuf;
1021 while (count >= sizeof(*u) && !ret) {
1022 compat_ulong_t word;
1023 ret = __get_user(word, u++);
1026 ret = putreg32(target, pos, word);
1027 count -= sizeof(*u);
1034 static long ia32_arch_ptrace(struct task_struct *child, compat_long_t request,
1035 compat_ulong_t caddr, compat_ulong_t cdata)
1037 unsigned long addr = caddr;
1038 unsigned long data = cdata;
1039 void __user *datap = compat_ptr(data);
1044 case PTRACE_PEEKUSR:
1045 ret = getreg32(child, addr, &val);
1047 ret = put_user(val, (__u32 __user *)datap);
1050 case PTRACE_POKEUSR:
1051 ret = putreg32(child, addr, data);
1054 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1055 return copy_regset_to_user(child, &user_x86_32_view,
1057 0, sizeof(struct user_regs_struct32),
1060 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1061 return copy_regset_from_user(child, &user_x86_32_view,
1063 sizeof(struct user_regs_struct32),
1066 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1067 return copy_regset_to_user(child, &user_x86_32_view,
1069 sizeof(struct user_i387_ia32_struct),
1072 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1073 return copy_regset_from_user(
1074 child, &user_x86_32_view, REGSET_FP,
1075 0, sizeof(struct user_i387_ia32_struct), datap);
1077 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1078 return copy_regset_to_user(child, &user_x86_32_view,
1080 sizeof(struct user32_fxsr_struct),
1083 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1084 return copy_regset_from_user(child, &user_x86_32_view,
1086 sizeof(struct user32_fxsr_struct),
1089 case PTRACE_GET_THREAD_AREA:
1090 case PTRACE_SET_THREAD_AREA:
1091 return arch_ptrace(child, request, addr, data);
1094 return compat_ptrace_request(child, request, addr, data);
1099 #endif /* CONFIG_IA32_EMULATION */
1101 #ifdef CONFIG_X86_X32_ABI
1102 static long x32_arch_ptrace(struct task_struct *child,
1103 compat_long_t request, compat_ulong_t caddr,
1104 compat_ulong_t cdata)
1106 unsigned long addr = caddr;
1107 unsigned long data = cdata;
1108 void __user *datap = compat_ptr(data);
1112 /* Read 32bits at location addr in the USER area. Only allow
1113 to return the lower 32bits of segment and debug registers. */
1114 case PTRACE_PEEKUSR: {
1118 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1119 addr < offsetof(struct user_regs_struct, cs))
1122 tmp = 0; /* Default return condition */
1123 if (addr < sizeof(struct user_regs_struct))
1124 tmp = getreg(child, addr);
1125 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1126 addr <= offsetof(struct user, u_debugreg[7])) {
1127 addr -= offsetof(struct user, u_debugreg[0]);
1128 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
1130 ret = put_user(tmp, (__u32 __user *)datap);
1134 /* Write the word at location addr in the USER area. Only allow
1135 to update segment and debug registers with the upper 32bits
1137 case PTRACE_POKEUSR:
1139 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1140 addr < offsetof(struct user_regs_struct, cs))
1143 if (addr < sizeof(struct user_regs_struct))
1144 ret = putreg(child, addr, data);
1145 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1146 addr <= offsetof(struct user, u_debugreg[7])) {
1147 addr -= offsetof(struct user, u_debugreg[0]);
1148 ret = ptrace_set_debugreg(child,
1149 addr / sizeof(data), data);
1153 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1154 return copy_regset_to_user(child,
1155 task_user_regset_view(current),
1157 0, sizeof(struct user_regs_struct),
1160 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1161 return copy_regset_from_user(child,
1162 task_user_regset_view(current),
1164 0, sizeof(struct user_regs_struct),
1167 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1168 return copy_regset_to_user(child,
1169 task_user_regset_view(current),
1171 0, sizeof(struct user_i387_struct),
1174 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1175 return copy_regset_from_user(child,
1176 task_user_regset_view(current),
1178 0, sizeof(struct user_i387_struct),
1182 return compat_ptrace_request(child, request, addr, data);
1189 #ifdef CONFIG_COMPAT
1190 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1191 compat_ulong_t caddr, compat_ulong_t cdata)
1193 #ifdef CONFIG_X86_X32_ABI
1194 if (!in_ia32_syscall())
1195 return x32_arch_ptrace(child, request, caddr, cdata);
1197 #ifdef CONFIG_IA32_EMULATION
1198 return ia32_arch_ptrace(child, request, caddr, cdata);
1203 #endif /* CONFIG_COMPAT */
1205 #ifdef CONFIG_X86_64
1207 static struct user_regset x86_64_regsets[] __ro_after_init = {
1208 [REGSET_GENERAL] = {
1209 .core_note_type = NT_PRSTATUS,
1210 .n = sizeof(struct user_regs_struct) / sizeof(long),
1211 .size = sizeof(long), .align = sizeof(long),
1212 .regset_get = genregs_get, .set = genregs_set
1215 .core_note_type = NT_PRFPREG,
1216 .n = sizeof(struct user_i387_struct) / sizeof(long),
1217 .size = sizeof(long), .align = sizeof(long),
1218 .active = regset_xregset_fpregs_active, .regset_get = xfpregs_get, .set = xfpregs_set
1221 .core_note_type = NT_X86_XSTATE,
1222 .size = sizeof(u64), .align = sizeof(u64),
1223 .active = xstateregs_active, .regset_get = xstateregs_get,
1224 .set = xstateregs_set
1226 [REGSET_IOPERM64] = {
1227 .core_note_type = NT_386_IOPERM,
1228 .n = IO_BITMAP_LONGS,
1229 .size = sizeof(long), .align = sizeof(long),
1230 .active = ioperm_active, .regset_get = ioperm_get
1234 static const struct user_regset_view user_x86_64_view = {
1235 .name = "x86_64", .e_machine = EM_X86_64,
1236 .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1239 #else /* CONFIG_X86_32 */
1241 #define user_regs_struct32 user_regs_struct
1242 #define genregs32_get genregs_get
1243 #define genregs32_set genregs_set
1245 #endif /* CONFIG_X86_64 */
1247 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1248 static struct user_regset x86_32_regsets[] __ro_after_init = {
1249 [REGSET_GENERAL] = {
1250 .core_note_type = NT_PRSTATUS,
1251 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1252 .size = sizeof(u32), .align = sizeof(u32),
1253 .regset_get = genregs32_get, .set = genregs32_set
1256 .core_note_type = NT_PRFPREG,
1257 .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32),
1258 .size = sizeof(u32), .align = sizeof(u32),
1259 .active = regset_fpregs_active, .regset_get = fpregs_get, .set = fpregs_set
1262 .core_note_type = NT_PRXFPREG,
1263 .n = sizeof(struct user32_fxsr_struct) / sizeof(u32),
1264 .size = sizeof(u32), .align = sizeof(u32),
1265 .active = regset_xregset_fpregs_active, .regset_get = xfpregs_get, .set = xfpregs_set
1268 .core_note_type = NT_X86_XSTATE,
1269 .size = sizeof(u64), .align = sizeof(u64),
1270 .active = xstateregs_active, .regset_get = xstateregs_get,
1271 .set = xstateregs_set
1274 .core_note_type = NT_386_TLS,
1275 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1276 .size = sizeof(struct user_desc),
1277 .align = sizeof(struct user_desc),
1278 .active = regset_tls_active,
1279 .regset_get = regset_tls_get, .set = regset_tls_set
1281 [REGSET_IOPERM32] = {
1282 .core_note_type = NT_386_IOPERM,
1283 .n = IO_BITMAP_BYTES / sizeof(u32),
1284 .size = sizeof(u32), .align = sizeof(u32),
1285 .active = ioperm_active, .regset_get = ioperm_get
1289 static const struct user_regset_view user_x86_32_view = {
1290 .name = "i386", .e_machine = EM_386,
1291 .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1296 * This represents bytes 464..511 in the memory layout exported through
1297 * the REGSET_XSTATE interface.
1299 u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
1301 void __init update_regset_xstate_info(unsigned int size, u64 xstate_mask)
1303 #ifdef CONFIG_X86_64
1304 x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1306 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1307 x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1309 xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask;
1312 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1314 #ifdef CONFIG_IA32_EMULATION
1315 if (!user_64bit_mode(task_pt_regs(task)))
1317 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1318 return &user_x86_32_view;
1320 #ifdef CONFIG_X86_64
1321 return &user_x86_64_view;
1325 void send_sigtrap(struct pt_regs *regs, int error_code, int si_code)
1327 struct task_struct *tsk = current;
1329 tsk->thread.trap_nr = X86_TRAP_DB;
1330 tsk->thread.error_code = error_code;
1332 /* Send us the fake SIGTRAP */
1333 force_sig_fault(SIGTRAP, si_code,
1334 user_mode(regs) ? (void __user *)regs->ip : NULL);
1337 void user_single_step_report(struct pt_regs *regs)
1339 send_sigtrap(regs, 0, TRAP_BRKPT);