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>
26 #include <linux/nospec.h>
28 #include <asm/uaccess.h>
29 #include <asm/pgtable.h>
30 #include <asm/processor.h>
31 #include <asm/fpu/internal.h>
32 #include <asm/fpu/signal.h>
33 #include <asm/fpu/regset.h>
34 #include <asm/debugreg.h>
37 #include <asm/prctl.h>
38 #include <asm/proto.h>
39 #include <asm/hw_breakpoint.h>
40 #include <asm/traps.h>
41 #include <asm/syscall.h>
49 REGSET_IOPERM64 = REGSET_XFP,
55 struct pt_regs_offset {
60 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
61 #define REG_OFFSET_END {.name = NULL, .offset = 0}
63 static const struct pt_regs_offset regoffset_table[] = {
87 REG_OFFSET_NAME(orig_ax),
90 REG_OFFSET_NAME(flags),
97 * regs_query_register_offset() - query register offset from its name
98 * @name: the name of a register
100 * regs_query_register_offset() returns the offset of a register in struct
101 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
103 int regs_query_register_offset(const char *name)
105 const struct pt_regs_offset *roff;
106 for (roff = regoffset_table; roff->name != NULL; roff++)
107 if (!strcmp(roff->name, name))
113 * regs_query_register_name() - query register name from its offset
114 * @offset: the offset of a register in struct pt_regs.
116 * regs_query_register_name() returns the name of a register from its
117 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
119 const char *regs_query_register_name(unsigned int offset)
121 const struct pt_regs_offset *roff;
122 for (roff = regoffset_table; roff->name != NULL; roff++)
123 if (roff->offset == offset)
128 static const int arg_offs_table[] = {
130 [0] = offsetof(struct pt_regs, ax),
131 [1] = offsetof(struct pt_regs, dx),
132 [2] = offsetof(struct pt_regs, cx)
133 #else /* CONFIG_X86_64 */
134 [0] = offsetof(struct pt_regs, di),
135 [1] = offsetof(struct pt_regs, si),
136 [2] = offsetof(struct pt_regs, dx),
137 [3] = offsetof(struct pt_regs, cx),
138 [4] = offsetof(struct pt_regs, r8),
139 [5] = offsetof(struct pt_regs, r9)
144 * does not yet catch signals sent when the child dies.
145 * in exit.c or in signal.c.
149 * Determines which flags the user has access to [1 = access, 0 = no access].
151 #define FLAG_MASK_32 ((unsigned long) \
152 (X86_EFLAGS_CF | X86_EFLAGS_PF | \
153 X86_EFLAGS_AF | X86_EFLAGS_ZF | \
154 X86_EFLAGS_SF | X86_EFLAGS_TF | \
155 X86_EFLAGS_DF | X86_EFLAGS_OF | \
156 X86_EFLAGS_RF | X86_EFLAGS_AC))
159 * Determines whether a value may be installed in a segment register.
161 static inline bool invalid_selector(u16 value)
163 return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL);
168 #define FLAG_MASK FLAG_MASK_32
171 * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
172 * when it traps. The previous stack will be directly underneath the saved
173 * registers, and 'sp/ss' won't even have been saved. Thus the '®s->sp'.
175 * Now, if the stack is empty, '®s->sp' is out of range. In this
176 * case we try to take the previous stack. To always return a non-null
177 * stack pointer we fall back to regs as stack if no previous stack
180 * This is valid only for kernel mode traps.
182 unsigned long kernel_stack_pointer(struct pt_regs *regs)
184 unsigned long context = (unsigned long)regs & ~(THREAD_SIZE - 1);
185 unsigned long sp = (unsigned long)®s->sp;
188 if (context == (sp & ~(THREAD_SIZE - 1)))
191 prev_esp = (u32 *)(context);
193 return (unsigned long)*prev_esp;
195 return (unsigned long)regs;
197 EXPORT_SYMBOL_GPL(kernel_stack_pointer);
199 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
201 BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
202 return ®s->bx + (regno >> 2);
205 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
208 * Returning the value truncates it to 16 bits.
211 if (offset != offsetof(struct user_regs_struct, gs))
212 retval = *pt_regs_access(task_pt_regs(task), offset);
215 retval = get_user_gs(task_pt_regs(task));
217 retval = task_user_gs(task);
222 static int set_segment_reg(struct task_struct *task,
223 unsigned long offset, u16 value)
226 * The value argument was already truncated to 16 bits.
228 if (invalid_selector(value))
232 * For %cs and %ss we cannot permit a null selector.
233 * We can permit a bogus selector as long as it has USER_RPL.
234 * Null selectors are fine for other segment registers, but
235 * we will never get back to user mode with invalid %cs or %ss
236 * and will take the trap in iret instead. Much code relies
237 * on user_mode() to distinguish a user trap frame (which can
238 * safely use invalid selectors) from a kernel trap frame.
241 case offsetof(struct user_regs_struct, cs):
242 case offsetof(struct user_regs_struct, ss):
243 if (unlikely(value == 0))
247 *pt_regs_access(task_pt_regs(task), offset) = value;
250 case offsetof(struct user_regs_struct, gs):
252 set_user_gs(task_pt_regs(task), value);
254 task_user_gs(task) = value;
260 #else /* CONFIG_X86_64 */
262 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
264 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
266 BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
267 return ®s->r15 + (offset / sizeof(regs->r15));
270 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
273 * Returning the value truncates it to 16 bits.
278 case offsetof(struct user_regs_struct, fs):
279 if (task == current) {
280 /* Older gas can't assemble movq %?s,%r?? */
281 asm("movl %%fs,%0" : "=r" (seg));
284 return task->thread.fsindex;
285 case offsetof(struct user_regs_struct, gs):
286 if (task == current) {
287 asm("movl %%gs,%0" : "=r" (seg));
290 return task->thread.gsindex;
291 case offsetof(struct user_regs_struct, ds):
292 if (task == current) {
293 asm("movl %%ds,%0" : "=r" (seg));
296 return task->thread.ds;
297 case offsetof(struct user_regs_struct, es):
298 if (task == current) {
299 asm("movl %%es,%0" : "=r" (seg));
302 return task->thread.es;
304 case offsetof(struct user_regs_struct, cs):
305 case offsetof(struct user_regs_struct, ss):
308 return *pt_regs_access(task_pt_regs(task), offset);
311 static int set_segment_reg(struct task_struct *task,
312 unsigned long offset, u16 value)
315 * The value argument was already truncated to 16 bits.
317 if (invalid_selector(value))
321 case offsetof(struct user_regs_struct,fs):
323 * If this is setting fs as for normal 64-bit use but
324 * setting fs_base has implicitly changed it, leave it.
326 if ((value == FS_TLS_SEL && task->thread.fsindex == 0 &&
327 task->thread.fs != 0) ||
328 (value == 0 && task->thread.fsindex == FS_TLS_SEL &&
329 task->thread.fs == 0))
331 task->thread.fsindex = value;
333 loadsegment(fs, task->thread.fsindex);
335 case offsetof(struct user_regs_struct,gs):
337 * If this is setting gs as for normal 64-bit use but
338 * setting gs_base has implicitly changed it, leave it.
340 if ((value == GS_TLS_SEL && task->thread.gsindex == 0 &&
341 task->thread.gs != 0) ||
342 (value == 0 && task->thread.gsindex == GS_TLS_SEL &&
343 task->thread.gs == 0))
345 task->thread.gsindex = value;
347 load_gs_index(task->thread.gsindex);
349 case offsetof(struct user_regs_struct,ds):
350 task->thread.ds = value;
352 loadsegment(ds, task->thread.ds);
354 case offsetof(struct user_regs_struct,es):
355 task->thread.es = value;
357 loadsegment(es, task->thread.es);
361 * Can't actually change these in 64-bit mode.
363 case offsetof(struct user_regs_struct,cs):
364 if (unlikely(value == 0))
366 task_pt_regs(task)->cs = value;
368 case offsetof(struct user_regs_struct,ss):
369 if (unlikely(value == 0))
371 task_pt_regs(task)->ss = value;
378 #endif /* CONFIG_X86_32 */
380 static unsigned long get_flags(struct task_struct *task)
382 unsigned long retval = task_pt_regs(task)->flags;
385 * If the debugger set TF, hide it from the readout.
387 if (test_tsk_thread_flag(task, TIF_FORCED_TF))
388 retval &= ~X86_EFLAGS_TF;
393 static int set_flags(struct task_struct *task, unsigned long value)
395 struct pt_regs *regs = task_pt_regs(task);
398 * If the user value contains TF, mark that
399 * it was not "us" (the debugger) that set it.
400 * If not, make sure it stays set if we had.
402 if (value & X86_EFLAGS_TF)
403 clear_tsk_thread_flag(task, TIF_FORCED_TF);
404 else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
405 value |= X86_EFLAGS_TF;
407 regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
412 static int putreg(struct task_struct *child,
413 unsigned long offset, unsigned long value)
416 case offsetof(struct user_regs_struct, cs):
417 case offsetof(struct user_regs_struct, ds):
418 case offsetof(struct user_regs_struct, es):
419 case offsetof(struct user_regs_struct, fs):
420 case offsetof(struct user_regs_struct, gs):
421 case offsetof(struct user_regs_struct, ss):
422 return set_segment_reg(child, offset, value);
424 case offsetof(struct user_regs_struct, flags):
425 return set_flags(child, value);
428 case offsetof(struct user_regs_struct,fs_base):
429 if (value >= TASK_SIZE_OF(child))
432 * When changing the segment base, use do_arch_prctl
433 * to set either thread.fs or thread.fsindex and the
434 * corresponding GDT slot.
436 if (child->thread.fs != value)
437 return do_arch_prctl(child, ARCH_SET_FS, value);
439 case offsetof(struct user_regs_struct,gs_base):
441 * Exactly the same here as the %fs handling above.
443 if (value >= TASK_SIZE_OF(child))
445 if (child->thread.gs != value)
446 return do_arch_prctl(child, ARCH_SET_GS, value);
451 *pt_regs_access(task_pt_regs(child), offset) = value;
455 static unsigned long getreg(struct task_struct *task, unsigned long offset)
458 case offsetof(struct user_regs_struct, cs):
459 case offsetof(struct user_regs_struct, ds):
460 case offsetof(struct user_regs_struct, es):
461 case offsetof(struct user_regs_struct, fs):
462 case offsetof(struct user_regs_struct, gs):
463 case offsetof(struct user_regs_struct, ss):
464 return get_segment_reg(task, offset);
466 case offsetof(struct user_regs_struct, flags):
467 return get_flags(task);
470 case offsetof(struct user_regs_struct, fs_base): {
472 * do_arch_prctl may have used a GDT slot instead of
473 * the MSR. To userland, it appears the same either
474 * way, except the %fs segment selector might not be 0.
476 unsigned int seg = task->thread.fsindex;
477 if (task->thread.fs != 0)
478 return task->thread.fs;
480 asm("movl %%fs,%0" : "=r" (seg));
481 if (seg != FS_TLS_SEL)
483 return get_desc_base(&task->thread.tls_array[FS_TLS]);
485 case offsetof(struct user_regs_struct, gs_base): {
487 * Exactly the same here as the %fs handling above.
489 unsigned int seg = task->thread.gsindex;
490 if (task->thread.gs != 0)
491 return task->thread.gs;
493 asm("movl %%gs,%0" : "=r" (seg));
494 if (seg != GS_TLS_SEL)
496 return get_desc_base(&task->thread.tls_array[GS_TLS]);
501 return *pt_regs_access(task_pt_regs(task), offset);
504 static int genregs_get(struct task_struct *target,
505 const struct user_regset *regset,
506 unsigned int pos, unsigned int count,
507 void *kbuf, void __user *ubuf)
510 unsigned long *k = kbuf;
511 while (count >= sizeof(*k)) {
512 *k++ = getreg(target, pos);
517 unsigned long __user *u = ubuf;
518 while (count >= sizeof(*u)) {
519 if (__put_user(getreg(target, pos), u++))
529 static int genregs_set(struct task_struct *target,
530 const struct user_regset *regset,
531 unsigned int pos, unsigned int count,
532 const void *kbuf, const void __user *ubuf)
536 const unsigned long *k = kbuf;
537 while (count >= sizeof(*k) && !ret) {
538 ret = putreg(target, pos, *k++);
543 const unsigned long __user *u = ubuf;
544 while (count >= sizeof(*u) && !ret) {
546 ret = __get_user(word, u++);
549 ret = putreg(target, pos, word);
557 static void ptrace_triggered(struct perf_event *bp,
558 struct perf_sample_data *data,
559 struct pt_regs *regs)
562 struct thread_struct *thread = &(current->thread);
565 * Store in the virtual DR6 register the fact that the breakpoint
566 * was hit so the thread's debugger will see it.
568 for (i = 0; i < HBP_NUM; i++) {
569 if (thread->ptrace_bps[i] == bp)
573 thread->debugreg6 |= (DR_TRAP0 << i);
577 * Walk through every ptrace breakpoints for this thread and
578 * build the dr7 value on top of their attributes.
581 static unsigned long ptrace_get_dr7(struct perf_event *bp[])
585 struct arch_hw_breakpoint *info;
587 for (i = 0; i < HBP_NUM; i++) {
588 if (bp[i] && !bp[i]->attr.disabled) {
589 info = counter_arch_bp(bp[i]);
590 dr7 |= encode_dr7(i, info->len, info->type);
597 static int ptrace_fill_bp_fields(struct perf_event_attr *attr,
598 int len, int type, bool disabled)
600 int err, bp_len, bp_type;
602 err = arch_bp_generic_fields(len, type, &bp_len, &bp_type);
604 attr->bp_len = bp_len;
605 attr->bp_type = bp_type;
606 attr->disabled = disabled;
612 static struct perf_event *
613 ptrace_register_breakpoint(struct task_struct *tsk, int len, int type,
614 unsigned long addr, bool disabled)
616 struct perf_event_attr attr;
619 ptrace_breakpoint_init(&attr);
622 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
626 return register_user_hw_breakpoint(&attr, ptrace_triggered,
630 static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type,
633 struct perf_event_attr attr = bp->attr;
636 err = ptrace_fill_bp_fields(&attr, len, type, disabled);
640 return modify_user_hw_breakpoint(bp, &attr);
644 * Handle ptrace writes to debug register 7.
646 static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data)
648 struct thread_struct *thread = &tsk->thread;
649 unsigned long old_dr7;
650 bool second_pass = false;
653 data &= ~DR_CONTROL_RESERVED;
654 old_dr7 = ptrace_get_dr7(thread->ptrace_bps);
658 for (i = 0; i < HBP_NUM; i++) {
660 bool disabled = !decode_dr7(data, i, &len, &type);
661 struct perf_event *bp = thread->ptrace_bps[i];
667 bp = ptrace_register_breakpoint(tsk,
668 len, type, 0, disabled);
674 thread->ptrace_bps[i] = bp;
678 rc = ptrace_modify_breakpoint(bp, len, type, disabled);
683 /* Restore if the first pass failed, second_pass shouldn't fail. */
684 if (rc && !WARN_ON(second_pass)) {
695 * Handle PTRACE_PEEKUSR calls for the debug register area.
697 static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
699 struct thread_struct *thread = &tsk->thread;
700 unsigned long val = 0;
703 int index = array_index_nospec(n, HBP_NUM);
704 struct perf_event *bp = thread->ptrace_bps[index];
707 val = bp->hw.info.address;
709 val = thread->debugreg6;
711 val = thread->ptrace_dr7;
716 static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr,
719 struct thread_struct *t = &tsk->thread;
720 struct perf_event *bp = t->ptrace_bps[nr];
725 * Put stub len and type to create an inactive but correct bp.
727 * CHECKME: the previous code returned -EIO if the addr wasn't
728 * a valid task virtual addr. The new one will return -EINVAL in
730 * -EINVAL may be what we want for in-kernel breakpoints users,
731 * but -EIO looks better for ptrace, since we refuse a register
732 * writing for the user. And anyway this is the previous
735 bp = ptrace_register_breakpoint(tsk,
736 X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE,
741 t->ptrace_bps[nr] = bp;
743 struct perf_event_attr attr = bp->attr;
746 err = modify_user_hw_breakpoint(bp, &attr);
753 * Handle PTRACE_POKEUSR calls for the debug register area.
755 static int ptrace_set_debugreg(struct task_struct *tsk, int n,
758 struct thread_struct *thread = &tsk->thread;
759 /* There are no DR4 or DR5 registers */
763 rc = ptrace_set_breakpoint_addr(tsk, n, val);
765 thread->debugreg6 = val;
768 rc = ptrace_write_dr7(tsk, val);
770 thread->ptrace_dr7 = val;
776 * These access the current or another (stopped) task's io permission
777 * bitmap for debugging or core dump.
779 static int ioperm_active(struct task_struct *target,
780 const struct user_regset *regset)
782 return target->thread.io_bitmap_max / regset->size;
785 static int ioperm_get(struct task_struct *target,
786 const struct user_regset *regset,
787 unsigned int pos, unsigned int count,
788 void *kbuf, void __user *ubuf)
790 if (!target->thread.io_bitmap_ptr)
793 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
794 target->thread.io_bitmap_ptr,
799 * Called by kernel/ptrace.c when detaching..
801 * Make sure the single step bit is not set.
803 void ptrace_disable(struct task_struct *child)
805 user_disable_single_step(child);
806 #ifdef TIF_SYSCALL_EMU
807 clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
811 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
812 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
815 long arch_ptrace(struct task_struct *child, long request,
816 unsigned long addr, unsigned long data)
819 unsigned long __user *datap = (unsigned long __user *)data;
822 /* read the word at location addr in the USER area. */
823 case PTRACE_PEEKUSR: {
827 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
830 tmp = 0; /* Default return condition */
831 if (addr < sizeof(struct user_regs_struct))
832 tmp = getreg(child, addr);
833 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
834 addr <= offsetof(struct user, u_debugreg[7])) {
835 addr -= offsetof(struct user, u_debugreg[0]);
836 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
838 ret = put_user(tmp, datap);
842 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
844 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
847 if (addr < sizeof(struct user_regs_struct))
848 ret = putreg(child, addr, data);
849 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
850 addr <= offsetof(struct user, u_debugreg[7])) {
851 addr -= offsetof(struct user, u_debugreg[0]);
852 ret = ptrace_set_debugreg(child,
853 addr / sizeof(data), data);
857 case PTRACE_GETREGS: /* Get all gp regs from the child. */
858 return copy_regset_to_user(child,
859 task_user_regset_view(current),
861 0, sizeof(struct user_regs_struct),
864 case PTRACE_SETREGS: /* Set all gp regs in the child. */
865 return copy_regset_from_user(child,
866 task_user_regset_view(current),
868 0, sizeof(struct user_regs_struct),
871 case PTRACE_GETFPREGS: /* Get the child FPU state. */
872 return copy_regset_to_user(child,
873 task_user_regset_view(current),
875 0, sizeof(struct user_i387_struct),
878 case PTRACE_SETFPREGS: /* Set the child FPU state. */
879 return copy_regset_from_user(child,
880 task_user_regset_view(current),
882 0, sizeof(struct user_i387_struct),
886 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
887 return copy_regset_to_user(child, &user_x86_32_view,
889 0, sizeof(struct user_fxsr_struct),
892 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
893 return copy_regset_from_user(child, &user_x86_32_view,
895 0, sizeof(struct user_fxsr_struct),
899 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
900 case PTRACE_GET_THREAD_AREA:
903 ret = do_get_thread_area(child, addr,
904 (struct user_desc __user *)data);
907 case PTRACE_SET_THREAD_AREA:
910 ret = do_set_thread_area(child, addr,
911 (struct user_desc __user *)data, 0);
916 /* normal 64bit interface to access TLS data.
917 Works just like arch_prctl, except that the arguments
919 case PTRACE_ARCH_PRCTL:
920 ret = do_arch_prctl(child, data, addr);
925 ret = ptrace_request(child, request, addr, data);
932 #ifdef CONFIG_IA32_EMULATION
934 #include <linux/compat.h>
935 #include <linux/syscalls.h>
936 #include <asm/ia32.h>
937 #include <asm/user32.h>
940 case offsetof(struct user32, regs.l): \
941 regs->q = value; break
944 case offsetof(struct user32, regs.rs): \
945 return set_segment_reg(child, \
946 offsetof(struct user_regs_struct, rs), \
950 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
952 struct pt_regs *regs = task_pt_regs(child);
973 case offsetof(struct user32, regs.orig_eax):
975 * A 32-bit debugger setting orig_eax means to restore
976 * the state of the task restarting a 32-bit syscall.
977 * Make sure we interpret the -ERESTART* codes correctly
978 * in case the task is not actually still sitting at the
979 * exit from a 32-bit syscall with TS_COMPAT still set.
981 regs->orig_ax = value;
982 if (syscall_get_nr(child, regs) >= 0)
983 task_thread_info(child)->status |= TS_COMPAT;
986 case offsetof(struct user32, regs.eflags):
987 return set_flags(child, value);
989 case offsetof(struct user32, u_debugreg[0]) ...
990 offsetof(struct user32, u_debugreg[7]):
991 regno -= offsetof(struct user32, u_debugreg[0]);
992 return ptrace_set_debugreg(child, regno / 4, value);
995 if (regno > sizeof(struct user32) || (regno & 3))
999 * Other dummy fields in the virtual user structure
1011 case offsetof(struct user32, regs.l): \
1012 *val = regs->q; break
1015 case offsetof(struct user32, regs.rs): \
1016 *val = get_segment_reg(child, \
1017 offsetof(struct user_regs_struct, rs)); \
1020 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
1022 struct pt_regs *regs = task_pt_regs(child);
1040 R32(orig_eax, orig_ax);
1044 case offsetof(struct user32, regs.eflags):
1045 *val = get_flags(child);
1048 case offsetof(struct user32, u_debugreg[0]) ...
1049 offsetof(struct user32, u_debugreg[7]):
1050 regno -= offsetof(struct user32, u_debugreg[0]);
1051 *val = ptrace_get_debugreg(child, regno / 4);
1055 if (regno > sizeof(struct user32) || (regno & 3))
1059 * Other dummy fields in the virtual user structure
1071 static int genregs32_get(struct task_struct *target,
1072 const struct user_regset *regset,
1073 unsigned int pos, unsigned int count,
1074 void *kbuf, void __user *ubuf)
1077 compat_ulong_t *k = kbuf;
1078 while (count >= sizeof(*k)) {
1079 getreg32(target, pos, k++);
1080 count -= sizeof(*k);
1084 compat_ulong_t __user *u = ubuf;
1085 while (count >= sizeof(*u)) {
1086 compat_ulong_t word;
1087 getreg32(target, pos, &word);
1088 if (__put_user(word, u++))
1090 count -= sizeof(*u);
1098 static int genregs32_set(struct task_struct *target,
1099 const struct user_regset *regset,
1100 unsigned int pos, unsigned int count,
1101 const void *kbuf, const void __user *ubuf)
1105 const compat_ulong_t *k = kbuf;
1106 while (count >= sizeof(*k) && !ret) {
1107 ret = putreg32(target, pos, *k++);
1108 count -= sizeof(*k);
1112 const compat_ulong_t __user *u = ubuf;
1113 while (count >= sizeof(*u) && !ret) {
1114 compat_ulong_t word;
1115 ret = __get_user(word, u++);
1118 ret = putreg32(target, pos, word);
1119 count -= sizeof(*u);
1126 static long ia32_arch_ptrace(struct task_struct *child, compat_long_t request,
1127 compat_ulong_t caddr, compat_ulong_t cdata)
1129 unsigned long addr = caddr;
1130 unsigned long data = cdata;
1131 void __user *datap = compat_ptr(data);
1136 case PTRACE_PEEKUSR:
1137 ret = getreg32(child, addr, &val);
1139 ret = put_user(val, (__u32 __user *)datap);
1142 case PTRACE_POKEUSR:
1143 ret = putreg32(child, addr, data);
1146 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1147 return copy_regset_to_user(child, &user_x86_32_view,
1149 0, sizeof(struct user_regs_struct32),
1152 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1153 return copy_regset_from_user(child, &user_x86_32_view,
1155 sizeof(struct user_regs_struct32),
1158 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1159 return copy_regset_to_user(child, &user_x86_32_view,
1161 sizeof(struct user_i387_ia32_struct),
1164 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1165 return copy_regset_from_user(
1166 child, &user_x86_32_view, REGSET_FP,
1167 0, sizeof(struct user_i387_ia32_struct), datap);
1169 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1170 return copy_regset_to_user(child, &user_x86_32_view,
1172 sizeof(struct user32_fxsr_struct),
1175 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1176 return copy_regset_from_user(child, &user_x86_32_view,
1178 sizeof(struct user32_fxsr_struct),
1181 case PTRACE_GET_THREAD_AREA:
1182 case PTRACE_SET_THREAD_AREA:
1183 return arch_ptrace(child, request, addr, data);
1186 return compat_ptrace_request(child, request, addr, data);
1191 #endif /* CONFIG_IA32_EMULATION */
1193 #ifdef CONFIG_X86_X32_ABI
1194 static long x32_arch_ptrace(struct task_struct *child,
1195 compat_long_t request, compat_ulong_t caddr,
1196 compat_ulong_t cdata)
1198 unsigned long addr = caddr;
1199 unsigned long data = cdata;
1200 void __user *datap = compat_ptr(data);
1204 /* Read 32bits at location addr in the USER area. Only allow
1205 to return the lower 32bits of segment and debug registers. */
1206 case PTRACE_PEEKUSR: {
1210 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1211 addr < offsetof(struct user_regs_struct, cs))
1214 tmp = 0; /* Default return condition */
1215 if (addr < sizeof(struct user_regs_struct))
1216 tmp = getreg(child, addr);
1217 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1218 addr <= offsetof(struct user, u_debugreg[7])) {
1219 addr -= offsetof(struct user, u_debugreg[0]);
1220 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
1222 ret = put_user(tmp, (__u32 __user *)datap);
1226 /* Write the word at location addr in the USER area. Only allow
1227 to update segment and debug registers with the upper 32bits
1229 case PTRACE_POKEUSR:
1231 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1232 addr < offsetof(struct user_regs_struct, cs))
1235 if (addr < sizeof(struct user_regs_struct))
1236 ret = putreg(child, addr, data);
1237 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1238 addr <= offsetof(struct user, u_debugreg[7])) {
1239 addr -= offsetof(struct user, u_debugreg[0]);
1240 ret = ptrace_set_debugreg(child,
1241 addr / sizeof(data), data);
1245 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1246 return copy_regset_to_user(child,
1247 task_user_regset_view(current),
1249 0, sizeof(struct user_regs_struct),
1252 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1253 return copy_regset_from_user(child,
1254 task_user_regset_view(current),
1256 0, sizeof(struct user_regs_struct),
1259 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1260 return copy_regset_to_user(child,
1261 task_user_regset_view(current),
1263 0, sizeof(struct user_i387_struct),
1266 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1267 return copy_regset_from_user(child,
1268 task_user_regset_view(current),
1270 0, sizeof(struct user_i387_struct),
1274 return compat_ptrace_request(child, request, addr, data);
1281 #ifdef CONFIG_COMPAT
1282 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1283 compat_ulong_t caddr, compat_ulong_t cdata)
1285 #ifdef CONFIG_X86_X32_ABI
1286 if (!is_ia32_task())
1287 return x32_arch_ptrace(child, request, caddr, cdata);
1289 #ifdef CONFIG_IA32_EMULATION
1290 return ia32_arch_ptrace(child, request, caddr, cdata);
1295 #endif /* CONFIG_COMPAT */
1297 #ifdef CONFIG_X86_64
1299 static struct user_regset x86_64_regsets[] __read_mostly = {
1300 [REGSET_GENERAL] = {
1301 .core_note_type = NT_PRSTATUS,
1302 .n = sizeof(struct user_regs_struct) / sizeof(long),
1303 .size = sizeof(long), .align = sizeof(long),
1304 .get = genregs_get, .set = genregs_set
1307 .core_note_type = NT_PRFPREG,
1308 .n = sizeof(struct user_i387_struct) / sizeof(long),
1309 .size = sizeof(long), .align = sizeof(long),
1310 .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set
1313 .core_note_type = NT_X86_XSTATE,
1314 .size = sizeof(u64), .align = sizeof(u64),
1315 .active = xstateregs_active, .get = xstateregs_get,
1316 .set = xstateregs_set
1318 [REGSET_IOPERM64] = {
1319 .core_note_type = NT_386_IOPERM,
1320 .n = IO_BITMAP_LONGS,
1321 .size = sizeof(long), .align = sizeof(long),
1322 .active = ioperm_active, .get = ioperm_get
1326 static const struct user_regset_view user_x86_64_view = {
1327 .name = "x86_64", .e_machine = EM_X86_64,
1328 .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1331 #else /* CONFIG_X86_32 */
1333 #define user_regs_struct32 user_regs_struct
1334 #define genregs32_get genregs_get
1335 #define genregs32_set genregs_set
1337 #endif /* CONFIG_X86_64 */
1339 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1340 static struct user_regset x86_32_regsets[] __read_mostly = {
1341 [REGSET_GENERAL] = {
1342 .core_note_type = NT_PRSTATUS,
1343 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1344 .size = sizeof(u32), .align = sizeof(u32),
1345 .get = genregs32_get, .set = genregs32_set
1348 .core_note_type = NT_PRFPREG,
1349 .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32),
1350 .size = sizeof(u32), .align = sizeof(u32),
1351 .active = regset_fpregs_active, .get = fpregs_get, .set = fpregs_set
1354 .core_note_type = NT_PRXFPREG,
1355 .n = sizeof(struct user32_fxsr_struct) / sizeof(u32),
1356 .size = sizeof(u32), .align = sizeof(u32),
1357 .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set
1360 .core_note_type = NT_X86_XSTATE,
1361 .size = sizeof(u64), .align = sizeof(u64),
1362 .active = xstateregs_active, .get = xstateregs_get,
1363 .set = xstateregs_set
1366 .core_note_type = NT_386_TLS,
1367 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1368 .size = sizeof(struct user_desc),
1369 .align = sizeof(struct user_desc),
1370 .active = regset_tls_active,
1371 .get = regset_tls_get, .set = regset_tls_set
1373 [REGSET_IOPERM32] = {
1374 .core_note_type = NT_386_IOPERM,
1375 .n = IO_BITMAP_BYTES / sizeof(u32),
1376 .size = sizeof(u32), .align = sizeof(u32),
1377 .active = ioperm_active, .get = ioperm_get
1381 static const struct user_regset_view user_x86_32_view = {
1382 .name = "i386", .e_machine = EM_386,
1383 .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1388 * This represents bytes 464..511 in the memory layout exported through
1389 * the REGSET_XSTATE interface.
1391 u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
1393 void update_regset_xstate_info(unsigned int size, u64 xstate_mask)
1395 #ifdef CONFIG_X86_64
1396 x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1398 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1399 x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1401 xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask;
1404 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1406 #ifdef CONFIG_IA32_EMULATION
1407 if (test_tsk_thread_flag(task, TIF_IA32))
1409 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1410 return &user_x86_32_view;
1412 #ifdef CONFIG_X86_64
1413 return &user_x86_64_view;
1417 static void fill_sigtrap_info(struct task_struct *tsk,
1418 struct pt_regs *regs,
1419 int error_code, int si_code,
1420 struct siginfo *info)
1422 tsk->thread.trap_nr = X86_TRAP_DB;
1423 tsk->thread.error_code = error_code;
1425 memset(info, 0, sizeof(*info));
1426 info->si_signo = SIGTRAP;
1427 info->si_code = si_code;
1428 info->si_addr = user_mode(regs) ? (void __user *)regs->ip : NULL;
1431 void user_single_step_siginfo(struct task_struct *tsk,
1432 struct pt_regs *regs,
1433 struct siginfo *info)
1435 fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info);
1438 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
1439 int error_code, int si_code)
1441 struct siginfo info;
1443 fill_sigtrap_info(tsk, regs, error_code, si_code, &info);
1444 /* Send us the fake SIGTRAP */
1445 force_sig_info(SIGTRAP, &info, tsk);