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/ptrace.h>
13 #include <linux/regset.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>
24 #include <asm/uaccess.h>
25 #include <asm/pgtable.h>
26 #include <asm/system.h>
27 #include <asm/processor.h>
29 #include <asm/debugreg.h>
32 #include <asm/prctl.h>
33 #include <asm/proto.h>
34 #include <asm/hw_breakpoint.h>
38 #define CREATE_TRACE_POINTS
39 #include <trace/events/syscalls.h>
45 REGSET_IOPERM64 = REGSET_XFP,
51 struct pt_regs_offset {
56 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
57 #define REG_OFFSET_END {.name = NULL, .offset = 0}
59 static const struct pt_regs_offset regoffset_table[] = {
83 REG_OFFSET_NAME(orig_ax),
86 REG_OFFSET_NAME(flags),
93 * regs_query_register_offset() - query register offset from its name
94 * @name: the name of a register
96 * regs_query_register_offset() returns the offset of a register in struct
97 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
99 int regs_query_register_offset(const char *name)
101 const struct pt_regs_offset *roff;
102 for (roff = regoffset_table; roff->name != NULL; roff++)
103 if (!strcmp(roff->name, name))
109 * regs_query_register_name() - query register name from its offset
110 * @offset: the offset of a register in struct pt_regs.
112 * regs_query_register_name() returns the name of a register from its
113 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
115 const char *regs_query_register_name(unsigned int offset)
117 const struct pt_regs_offset *roff;
118 for (roff = regoffset_table; roff->name != NULL; roff++)
119 if (roff->offset == offset)
124 static const int arg_offs_table[] = {
126 [0] = offsetof(struct pt_regs, ax),
127 [1] = offsetof(struct pt_regs, dx),
128 [2] = offsetof(struct pt_regs, cx)
129 #else /* CONFIG_X86_64 */
130 [0] = offsetof(struct pt_regs, di),
131 [1] = offsetof(struct pt_regs, si),
132 [2] = offsetof(struct pt_regs, dx),
133 [3] = offsetof(struct pt_regs, cx),
134 [4] = offsetof(struct pt_regs, r8),
135 [5] = offsetof(struct pt_regs, r9)
140 * does not yet catch signals sent when the child dies.
141 * in exit.c or in signal.c.
145 * Determines which flags the user has access to [1 = access, 0 = no access].
147 #define FLAG_MASK_32 ((unsigned long) \
148 (X86_EFLAGS_CF | X86_EFLAGS_PF | \
149 X86_EFLAGS_AF | X86_EFLAGS_ZF | \
150 X86_EFLAGS_SF | X86_EFLAGS_TF | \
151 X86_EFLAGS_DF | X86_EFLAGS_OF | \
152 X86_EFLAGS_RF | X86_EFLAGS_AC))
155 * Determines whether a value may be installed in a segment register.
157 static inline bool invalid_selector(u16 value)
159 return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL);
164 #define FLAG_MASK FLAG_MASK_32
166 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
168 BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
169 return ®s->bx + (regno >> 2);
172 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
175 * Returning the value truncates it to 16 bits.
178 if (offset != offsetof(struct user_regs_struct, gs))
179 retval = *pt_regs_access(task_pt_regs(task), offset);
182 retval = get_user_gs(task_pt_regs(task));
184 retval = task_user_gs(task);
189 static int set_segment_reg(struct task_struct *task,
190 unsigned long offset, u16 value)
193 * The value argument was already truncated to 16 bits.
195 if (invalid_selector(value))
199 * For %cs and %ss we cannot permit a null selector.
200 * We can permit a bogus selector as long as it has USER_RPL.
201 * Null selectors are fine for other segment registers, but
202 * we will never get back to user mode with invalid %cs or %ss
203 * and will take the trap in iret instead. Much code relies
204 * on user_mode() to distinguish a user trap frame (which can
205 * safely use invalid selectors) from a kernel trap frame.
208 case offsetof(struct user_regs_struct, cs):
209 case offsetof(struct user_regs_struct, ss):
210 if (unlikely(value == 0))
214 *pt_regs_access(task_pt_regs(task), offset) = value;
217 case offsetof(struct user_regs_struct, gs):
219 set_user_gs(task_pt_regs(task), value);
221 task_user_gs(task) = value;
227 #else /* CONFIG_X86_64 */
229 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
231 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
233 BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
234 return ®s->r15 + (offset / sizeof(regs->r15));
237 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
240 * Returning the value truncates it to 16 bits.
245 case offsetof(struct user_regs_struct, fs):
246 if (task == current) {
247 /* Older gas can't assemble movq %?s,%r?? */
248 asm("movl %%fs,%0" : "=r" (seg));
251 return task->thread.fsindex;
252 case offsetof(struct user_regs_struct, gs):
253 if (task == current) {
254 asm("movl %%gs,%0" : "=r" (seg));
257 return task->thread.gsindex;
258 case offsetof(struct user_regs_struct, ds):
259 if (task == current) {
260 asm("movl %%ds,%0" : "=r" (seg));
263 return task->thread.ds;
264 case offsetof(struct user_regs_struct, es):
265 if (task == current) {
266 asm("movl %%es,%0" : "=r" (seg));
269 return task->thread.es;
271 case offsetof(struct user_regs_struct, cs):
272 case offsetof(struct user_regs_struct, ss):
275 return *pt_regs_access(task_pt_regs(task), offset);
278 static int set_segment_reg(struct task_struct *task,
279 unsigned long offset, u16 value)
282 * The value argument was already truncated to 16 bits.
284 if (invalid_selector(value))
288 case offsetof(struct user_regs_struct,fs):
290 * If this is setting fs as for normal 64-bit use but
291 * setting fs_base has implicitly changed it, leave it.
293 if ((value == FS_TLS_SEL && task->thread.fsindex == 0 &&
294 task->thread.fs != 0) ||
295 (value == 0 && task->thread.fsindex == FS_TLS_SEL &&
296 task->thread.fs == 0))
298 task->thread.fsindex = value;
300 loadsegment(fs, task->thread.fsindex);
302 case offsetof(struct user_regs_struct,gs):
304 * If this is setting gs as for normal 64-bit use but
305 * setting gs_base has implicitly changed it, leave it.
307 if ((value == GS_TLS_SEL && task->thread.gsindex == 0 &&
308 task->thread.gs != 0) ||
309 (value == 0 && task->thread.gsindex == GS_TLS_SEL &&
310 task->thread.gs == 0))
312 task->thread.gsindex = value;
314 load_gs_index(task->thread.gsindex);
316 case offsetof(struct user_regs_struct,ds):
317 task->thread.ds = value;
319 loadsegment(ds, task->thread.ds);
321 case offsetof(struct user_regs_struct,es):
322 task->thread.es = value;
324 loadsegment(es, task->thread.es);
328 * Can't actually change these in 64-bit mode.
330 case offsetof(struct user_regs_struct,cs):
331 if (unlikely(value == 0))
333 #ifdef CONFIG_IA32_EMULATION
334 if (test_tsk_thread_flag(task, TIF_IA32))
335 task_pt_regs(task)->cs = value;
338 case offsetof(struct user_regs_struct,ss):
339 if (unlikely(value == 0))
341 #ifdef CONFIG_IA32_EMULATION
342 if (test_tsk_thread_flag(task, TIF_IA32))
343 task_pt_regs(task)->ss = value;
351 #endif /* CONFIG_X86_32 */
353 static unsigned long get_flags(struct task_struct *task)
355 unsigned long retval = task_pt_regs(task)->flags;
358 * If the debugger set TF, hide it from the readout.
360 if (test_tsk_thread_flag(task, TIF_FORCED_TF))
361 retval &= ~X86_EFLAGS_TF;
366 static int set_flags(struct task_struct *task, unsigned long value)
368 struct pt_regs *regs = task_pt_regs(task);
371 * If the user value contains TF, mark that
372 * it was not "us" (the debugger) that set it.
373 * If not, make sure it stays set if we had.
375 if (value & X86_EFLAGS_TF)
376 clear_tsk_thread_flag(task, TIF_FORCED_TF);
377 else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
378 value |= X86_EFLAGS_TF;
380 regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
385 static int putreg(struct task_struct *child,
386 unsigned long offset, unsigned long value)
389 case offsetof(struct user_regs_struct, cs):
390 case offsetof(struct user_regs_struct, ds):
391 case offsetof(struct user_regs_struct, es):
392 case offsetof(struct user_regs_struct, fs):
393 case offsetof(struct user_regs_struct, gs):
394 case offsetof(struct user_regs_struct, ss):
395 return set_segment_reg(child, offset, value);
397 case offsetof(struct user_regs_struct, flags):
398 return set_flags(child, value);
401 case offsetof(struct user_regs_struct,fs_base):
402 if (value >= TASK_SIZE_OF(child))
405 * When changing the segment base, use do_arch_prctl
406 * to set either thread.fs or thread.fsindex and the
407 * corresponding GDT slot.
409 if (child->thread.fs != value)
410 return do_arch_prctl(child, ARCH_SET_FS, value);
412 case offsetof(struct user_regs_struct,gs_base):
414 * Exactly the same here as the %fs handling above.
416 if (value >= TASK_SIZE_OF(child))
418 if (child->thread.gs != value)
419 return do_arch_prctl(child, ARCH_SET_GS, value);
424 *pt_regs_access(task_pt_regs(child), offset) = value;
428 static unsigned long getreg(struct task_struct *task, unsigned long offset)
431 case offsetof(struct user_regs_struct, cs):
432 case offsetof(struct user_regs_struct, ds):
433 case offsetof(struct user_regs_struct, es):
434 case offsetof(struct user_regs_struct, fs):
435 case offsetof(struct user_regs_struct, gs):
436 case offsetof(struct user_regs_struct, ss):
437 return get_segment_reg(task, offset);
439 case offsetof(struct user_regs_struct, flags):
440 return get_flags(task);
443 case offsetof(struct user_regs_struct, fs_base): {
445 * do_arch_prctl may have used a GDT slot instead of
446 * the MSR. To userland, it appears the same either
447 * way, except the %fs segment selector might not be 0.
449 unsigned int seg = task->thread.fsindex;
450 if (task->thread.fs != 0)
451 return task->thread.fs;
453 asm("movl %%fs,%0" : "=r" (seg));
454 if (seg != FS_TLS_SEL)
456 return get_desc_base(&task->thread.tls_array[FS_TLS]);
458 case offsetof(struct user_regs_struct, gs_base): {
460 * Exactly the same here as the %fs handling above.
462 unsigned int seg = task->thread.gsindex;
463 if (task->thread.gs != 0)
464 return task->thread.gs;
466 asm("movl %%gs,%0" : "=r" (seg));
467 if (seg != GS_TLS_SEL)
469 return get_desc_base(&task->thread.tls_array[GS_TLS]);
474 return *pt_regs_access(task_pt_regs(task), offset);
477 static int genregs_get(struct task_struct *target,
478 const struct user_regset *regset,
479 unsigned int pos, unsigned int count,
480 void *kbuf, void __user *ubuf)
483 unsigned long *k = kbuf;
484 while (count >= sizeof(*k)) {
485 *k++ = getreg(target, pos);
490 unsigned long __user *u = ubuf;
491 while (count >= sizeof(*u)) {
492 if (__put_user(getreg(target, pos), u++))
502 static int genregs_set(struct task_struct *target,
503 const struct user_regset *regset,
504 unsigned int pos, unsigned int count,
505 const void *kbuf, const void __user *ubuf)
509 const unsigned long *k = kbuf;
510 while (count >= sizeof(*k) && !ret) {
511 ret = putreg(target, pos, *k++);
516 const unsigned long __user *u = ubuf;
517 while (count >= sizeof(*u) && !ret) {
519 ret = __get_user(word, u++);
522 ret = putreg(target, pos, word);
530 static void ptrace_triggered(struct perf_event *bp, int nmi,
531 struct perf_sample_data *data,
532 struct pt_regs *regs)
535 struct thread_struct *thread = &(current->thread);
538 * Store in the virtual DR6 register the fact that the breakpoint
539 * was hit so the thread's debugger will see it.
541 for (i = 0; i < HBP_NUM; i++) {
542 if (thread->ptrace_bps[i] == bp)
546 thread->debugreg6 |= (DR_TRAP0 << i);
550 * Walk through every ptrace breakpoints for this thread and
551 * build the dr7 value on top of their attributes.
554 static unsigned long ptrace_get_dr7(struct perf_event *bp[])
558 struct arch_hw_breakpoint *info;
560 for (i = 0; i < HBP_NUM; i++) {
561 if (bp[i] && !bp[i]->attr.disabled) {
562 info = counter_arch_bp(bp[i]);
563 dr7 |= encode_dr7(i, info->len, info->type);
571 ptrace_modify_breakpoint(struct perf_event *bp, int len, int type,
572 struct task_struct *tsk, int disabled)
575 int gen_len, gen_type;
576 struct perf_event_attr attr;
579 * We should have at least an inactive breakpoint at this
580 * slot. It means the user is writing dr7 without having
581 * written the address register first
586 err = arch_bp_generic_fields(len, type, &gen_len, &gen_type);
591 attr.bp_len = gen_len;
592 attr.bp_type = gen_type;
593 attr.disabled = disabled;
595 return modify_user_hw_breakpoint(bp, &attr);
599 * Handle ptrace writes to debug register 7.
601 static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data)
603 struct thread_struct *thread = &(tsk->thread);
604 unsigned long old_dr7;
605 int i, orig_ret = 0, rc = 0;
606 int enabled, second_pass = 0;
608 struct perf_event *bp;
610 data &= ~DR_CONTROL_RESERVED;
611 old_dr7 = ptrace_get_dr7(thread->ptrace_bps);
614 * Loop through all the hardware breakpoints, making the
615 * appropriate changes to each.
617 for (i = 0; i < HBP_NUM; i++) {
618 enabled = decode_dr7(data, i, &len, &type);
619 bp = thread->ptrace_bps[i];
624 * Don't unregister the breakpoints right-away,
625 * unless all register_user_hw_breakpoint()
626 * requests have succeeded. This prevents
627 * any window of opportunity for debug
628 * register grabbing by other users.
633 rc = ptrace_modify_breakpoint(bp, len, type,
641 rc = ptrace_modify_breakpoint(bp, len, type, tsk, 0);
646 * Make a second pass to free the remaining unused breakpoints
647 * or to restore the original breakpoints if an error occurred.
657 return ((orig_ret < 0) ? orig_ret : rc);
661 * Handle PTRACE_PEEKUSR calls for the debug register area.
663 static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
665 struct thread_struct *thread = &(tsk->thread);
666 unsigned long val = 0;
669 struct perf_event *bp;
670 bp = thread->ptrace_bps[n];
673 val = bp->hw.info.address;
675 val = thread->debugreg6;
677 val = thread->ptrace_dr7;
682 static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr,
685 struct perf_event *bp;
686 struct thread_struct *t = &tsk->thread;
687 struct perf_event_attr attr;
689 if (!t->ptrace_bps[nr]) {
690 hw_breakpoint_init(&attr);
692 * Put stub len and type to register (reserve) an inactive but
696 attr.bp_len = HW_BREAKPOINT_LEN_1;
697 attr.bp_type = HW_BREAKPOINT_W;
700 bp = register_user_hw_breakpoint(&attr, ptrace_triggered, tsk);
703 * CHECKME: the previous code returned -EIO if the addr wasn't
704 * a valid task virtual addr. The new one will return -EINVAL in
706 * -EINVAL may be what we want for in-kernel breakpoints users,
707 * but -EIO looks better for ptrace, since we refuse a register
708 * writing for the user. And anyway this is the previous
714 t->ptrace_bps[nr] = bp;
718 bp = t->ptrace_bps[nr];
722 err = modify_user_hw_breakpoint(bp, &attr);
732 * Handle PTRACE_POKEUSR calls for the debug register area.
734 int ptrace_set_debugreg(struct task_struct *tsk, int n, unsigned long val)
736 struct thread_struct *thread = &(tsk->thread);
739 /* There are no DR4 or DR5 registers */
740 if (n == 4 || n == 5)
744 thread->debugreg6 = val;
748 rc = ptrace_set_breakpoint_addr(tsk, n, val);
752 /* All that's left is DR7 */
754 rc = ptrace_write_dr7(tsk, val);
756 thread->ptrace_dr7 = val;
764 * These access the current or another (stopped) task's io permission
765 * bitmap for debugging or core dump.
767 static int ioperm_active(struct task_struct *target,
768 const struct user_regset *regset)
770 return target->thread.io_bitmap_max / regset->size;
773 static int ioperm_get(struct task_struct *target,
774 const struct user_regset *regset,
775 unsigned int pos, unsigned int count,
776 void *kbuf, void __user *ubuf)
778 if (!target->thread.io_bitmap_ptr)
781 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
782 target->thread.io_bitmap_ptr,
787 * Called by kernel/ptrace.c when detaching..
789 * Make sure the single step bit is not set.
791 void ptrace_disable(struct task_struct *child)
793 user_disable_single_step(child);
794 #ifdef TIF_SYSCALL_EMU
795 clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
799 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
800 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
803 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
806 unsigned long __user *datap = (unsigned long __user *)data;
809 /* read the word at location addr in the USER area. */
810 case PTRACE_PEEKUSR: {
814 if ((addr & (sizeof(data) - 1)) || addr < 0 ||
815 addr >= sizeof(struct user))
818 tmp = 0; /* Default return condition */
819 if (addr < sizeof(struct user_regs_struct))
820 tmp = getreg(child, addr);
821 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
822 addr <= offsetof(struct user, u_debugreg[7])) {
823 addr -= offsetof(struct user, u_debugreg[0]);
824 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
826 ret = put_user(tmp, datap);
830 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
832 if ((addr & (sizeof(data) - 1)) || addr < 0 ||
833 addr >= sizeof(struct user))
836 if (addr < sizeof(struct user_regs_struct))
837 ret = putreg(child, addr, data);
838 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
839 addr <= offsetof(struct user, u_debugreg[7])) {
840 addr -= offsetof(struct user, u_debugreg[0]);
841 ret = ptrace_set_debugreg(child,
842 addr / sizeof(data), data);
846 case PTRACE_GETREGS: /* Get all gp regs from the child. */
847 return copy_regset_to_user(child,
848 task_user_regset_view(current),
850 0, sizeof(struct user_regs_struct),
853 case PTRACE_SETREGS: /* Set all gp regs in the child. */
854 return copy_regset_from_user(child,
855 task_user_regset_view(current),
857 0, sizeof(struct user_regs_struct),
860 case PTRACE_GETFPREGS: /* Get the child FPU state. */
861 return copy_regset_to_user(child,
862 task_user_regset_view(current),
864 0, sizeof(struct user_i387_struct),
867 case PTRACE_SETFPREGS: /* Set the child FPU state. */
868 return copy_regset_from_user(child,
869 task_user_regset_view(current),
871 0, sizeof(struct user_i387_struct),
875 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
876 return copy_regset_to_user(child, &user_x86_32_view,
878 0, sizeof(struct user_fxsr_struct),
881 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
882 return copy_regset_from_user(child, &user_x86_32_view,
884 0, sizeof(struct user_fxsr_struct),
888 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
889 case PTRACE_GET_THREAD_AREA:
892 ret = do_get_thread_area(child, addr,
893 (struct user_desc __user *) data);
896 case PTRACE_SET_THREAD_AREA:
899 ret = do_set_thread_area(child, addr,
900 (struct user_desc __user *) data, 0);
905 /* normal 64bit interface to access TLS data.
906 Works just like arch_prctl, except that the arguments
908 case PTRACE_ARCH_PRCTL:
909 ret = do_arch_prctl(child, data, addr);
914 ret = ptrace_request(child, request, addr, data);
921 #ifdef CONFIG_IA32_EMULATION
923 #include <linux/compat.h>
924 #include <linux/syscalls.h>
925 #include <asm/ia32.h>
926 #include <asm/user32.h>
929 case offsetof(struct user32, regs.l): \
930 regs->q = value; break
933 case offsetof(struct user32, regs.rs): \
934 return set_segment_reg(child, \
935 offsetof(struct user_regs_struct, rs), \
939 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
941 struct pt_regs *regs = task_pt_regs(child);
962 case offsetof(struct user32, regs.orig_eax):
964 * A 32-bit debugger setting orig_eax means to restore
965 * the state of the task restarting a 32-bit syscall.
966 * Make sure we interpret the -ERESTART* codes correctly
967 * in case the task is not actually still sitting at the
968 * exit from a 32-bit syscall with TS_COMPAT still set.
970 regs->orig_ax = value;
971 if (syscall_get_nr(child, regs) >= 0)
972 task_thread_info(child)->status |= TS_COMPAT;
975 case offsetof(struct user32, regs.eflags):
976 return set_flags(child, value);
978 case offsetof(struct user32, u_debugreg[0]) ...
979 offsetof(struct user32, u_debugreg[7]):
980 regno -= offsetof(struct user32, u_debugreg[0]);
981 return ptrace_set_debugreg(child, regno / 4, value);
984 if (regno > sizeof(struct user32) || (regno & 3))
988 * Other dummy fields in the virtual user structure
1000 case offsetof(struct user32, regs.l): \
1001 *val = regs->q; break
1004 case offsetof(struct user32, regs.rs): \
1005 *val = get_segment_reg(child, \
1006 offsetof(struct user_regs_struct, rs)); \
1009 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
1011 struct pt_regs *regs = task_pt_regs(child);
1029 R32(orig_eax, orig_ax);
1033 case offsetof(struct user32, regs.eflags):
1034 *val = get_flags(child);
1037 case offsetof(struct user32, u_debugreg[0]) ...
1038 offsetof(struct user32, u_debugreg[7]):
1039 regno -= offsetof(struct user32, u_debugreg[0]);
1040 *val = ptrace_get_debugreg(child, regno / 4);
1044 if (regno > sizeof(struct user32) || (regno & 3))
1048 * Other dummy fields in the virtual user structure
1060 static int genregs32_get(struct task_struct *target,
1061 const struct user_regset *regset,
1062 unsigned int pos, unsigned int count,
1063 void *kbuf, void __user *ubuf)
1066 compat_ulong_t *k = kbuf;
1067 while (count >= sizeof(*k)) {
1068 getreg32(target, pos, k++);
1069 count -= sizeof(*k);
1073 compat_ulong_t __user *u = ubuf;
1074 while (count >= sizeof(*u)) {
1075 compat_ulong_t word;
1076 getreg32(target, pos, &word);
1077 if (__put_user(word, u++))
1079 count -= sizeof(*u);
1087 static int genregs32_set(struct task_struct *target,
1088 const struct user_regset *regset,
1089 unsigned int pos, unsigned int count,
1090 const void *kbuf, const void __user *ubuf)
1094 const compat_ulong_t *k = kbuf;
1095 while (count >= sizeof(*k) && !ret) {
1096 ret = putreg32(target, pos, *k++);
1097 count -= sizeof(*k);
1101 const compat_ulong_t __user *u = ubuf;
1102 while (count >= sizeof(*u) && !ret) {
1103 compat_ulong_t word;
1104 ret = __get_user(word, u++);
1107 ret = putreg32(target, pos, word);
1108 count -= sizeof(*u);
1115 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1116 compat_ulong_t caddr, compat_ulong_t cdata)
1118 unsigned long addr = caddr;
1119 unsigned long data = cdata;
1120 void __user *datap = compat_ptr(data);
1125 case PTRACE_PEEKUSR:
1126 ret = getreg32(child, addr, &val);
1128 ret = put_user(val, (__u32 __user *)datap);
1131 case PTRACE_POKEUSR:
1132 ret = putreg32(child, addr, data);
1135 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1136 return copy_regset_to_user(child, &user_x86_32_view,
1138 0, sizeof(struct user_regs_struct32),
1141 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1142 return copy_regset_from_user(child, &user_x86_32_view,
1144 sizeof(struct user_regs_struct32),
1147 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1148 return copy_regset_to_user(child, &user_x86_32_view,
1150 sizeof(struct user_i387_ia32_struct),
1153 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1154 return copy_regset_from_user(
1155 child, &user_x86_32_view, REGSET_FP,
1156 0, sizeof(struct user_i387_ia32_struct), datap);
1158 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1159 return copy_regset_to_user(child, &user_x86_32_view,
1161 sizeof(struct user32_fxsr_struct),
1164 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1165 return copy_regset_from_user(child, &user_x86_32_view,
1167 sizeof(struct user32_fxsr_struct),
1170 case PTRACE_GET_THREAD_AREA:
1171 case PTRACE_SET_THREAD_AREA:
1172 return arch_ptrace(child, request, addr, data);
1175 return compat_ptrace_request(child, request, addr, data);
1181 #endif /* CONFIG_IA32_EMULATION */
1183 #ifdef CONFIG_X86_64
1185 static struct user_regset x86_64_regsets[] __read_mostly = {
1186 [REGSET_GENERAL] = {
1187 .core_note_type = NT_PRSTATUS,
1188 .n = sizeof(struct user_regs_struct) / sizeof(long),
1189 .size = sizeof(long), .align = sizeof(long),
1190 .get = genregs_get, .set = genregs_set
1193 .core_note_type = NT_PRFPREG,
1194 .n = sizeof(struct user_i387_struct) / sizeof(long),
1195 .size = sizeof(long), .align = sizeof(long),
1196 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
1199 .core_note_type = NT_X86_XSTATE,
1200 .size = sizeof(u64), .align = sizeof(u64),
1201 .active = xstateregs_active, .get = xstateregs_get,
1202 .set = xstateregs_set
1204 [REGSET_IOPERM64] = {
1205 .core_note_type = NT_386_IOPERM,
1206 .n = IO_BITMAP_LONGS,
1207 .size = sizeof(long), .align = sizeof(long),
1208 .active = ioperm_active, .get = ioperm_get
1212 static const struct user_regset_view user_x86_64_view = {
1213 .name = "x86_64", .e_machine = EM_X86_64,
1214 .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1217 #else /* CONFIG_X86_32 */
1219 #define user_regs_struct32 user_regs_struct
1220 #define genregs32_get genregs_get
1221 #define genregs32_set genregs_set
1223 #define user_i387_ia32_struct user_i387_struct
1224 #define user32_fxsr_struct user_fxsr_struct
1226 #endif /* CONFIG_X86_64 */
1228 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1229 static struct user_regset x86_32_regsets[] __read_mostly = {
1230 [REGSET_GENERAL] = {
1231 .core_note_type = NT_PRSTATUS,
1232 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1233 .size = sizeof(u32), .align = sizeof(u32),
1234 .get = genregs32_get, .set = genregs32_set
1237 .core_note_type = NT_PRFPREG,
1238 .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32),
1239 .size = sizeof(u32), .align = sizeof(u32),
1240 .active = fpregs_active, .get = fpregs_get, .set = fpregs_set
1243 .core_note_type = NT_PRXFPREG,
1244 .n = sizeof(struct user32_fxsr_struct) / sizeof(u32),
1245 .size = sizeof(u32), .align = sizeof(u32),
1246 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
1249 .core_note_type = NT_X86_XSTATE,
1250 .size = sizeof(u64), .align = sizeof(u64),
1251 .active = xstateregs_active, .get = xstateregs_get,
1252 .set = xstateregs_set
1255 .core_note_type = NT_386_TLS,
1256 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1257 .size = sizeof(struct user_desc),
1258 .align = sizeof(struct user_desc),
1259 .active = regset_tls_active,
1260 .get = regset_tls_get, .set = regset_tls_set
1262 [REGSET_IOPERM32] = {
1263 .core_note_type = NT_386_IOPERM,
1264 .n = IO_BITMAP_BYTES / sizeof(u32),
1265 .size = sizeof(u32), .align = sizeof(u32),
1266 .active = ioperm_active, .get = ioperm_get
1270 static const struct user_regset_view user_x86_32_view = {
1271 .name = "i386", .e_machine = EM_386,
1272 .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1277 * This represents bytes 464..511 in the memory layout exported through
1278 * the REGSET_XSTATE interface.
1280 u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
1282 void update_regset_xstate_info(unsigned int size, u64 xstate_mask)
1284 #ifdef CONFIG_X86_64
1285 x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1287 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1288 x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1290 xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask;
1293 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1295 #ifdef CONFIG_IA32_EMULATION
1296 if (test_tsk_thread_flag(task, TIF_IA32))
1298 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1299 return &user_x86_32_view;
1301 #ifdef CONFIG_X86_64
1302 return &user_x86_64_view;
1306 static void fill_sigtrap_info(struct task_struct *tsk,
1307 struct pt_regs *regs,
1308 int error_code, int si_code,
1309 struct siginfo *info)
1311 tsk->thread.trap_no = 1;
1312 tsk->thread.error_code = error_code;
1314 memset(info, 0, sizeof(*info));
1315 info->si_signo = SIGTRAP;
1316 info->si_code = si_code;
1317 info->si_addr = user_mode_vm(regs) ? (void __user *)regs->ip : NULL;
1320 void user_single_step_siginfo(struct task_struct *tsk,
1321 struct pt_regs *regs,
1322 struct siginfo *info)
1324 fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info);
1327 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
1328 int error_code, int si_code)
1330 struct siginfo info;
1332 fill_sigtrap_info(tsk, regs, error_code, si_code, &info);
1333 /* Send us the fake SIGTRAP */
1334 force_sig_info(SIGTRAP, &info, tsk);
1338 #ifdef CONFIG_X86_32
1340 #elif defined CONFIG_IA32_EMULATION
1341 # define IS_IA32 is_compat_task()
1347 * We must return the syscall number to actually look up in the table.
1348 * This can be -1L to skip running any syscall at all.
1350 asmregparm long syscall_trace_enter(struct pt_regs *regs)
1355 * If we stepped into a sysenter/syscall insn, it trapped in
1356 * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP.
1357 * If user-mode had set TF itself, then it's still clear from
1358 * do_debug() and we need to set it again to restore the user
1359 * state. If we entered on the slow path, TF was already set.
1361 if (test_thread_flag(TIF_SINGLESTEP))
1362 regs->flags |= X86_EFLAGS_TF;
1364 /* do the secure computing check first */
1365 secure_computing(regs->orig_ax);
1367 if (unlikely(test_thread_flag(TIF_SYSCALL_EMU)))
1370 if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) &&
1371 tracehook_report_syscall_entry(regs))
1374 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1375 trace_sys_enter(regs, regs->orig_ax);
1377 if (unlikely(current->audit_context)) {
1379 audit_syscall_entry(AUDIT_ARCH_I386,
1382 regs->dx, regs->si);
1383 #ifdef CONFIG_X86_64
1385 audit_syscall_entry(AUDIT_ARCH_X86_64,
1388 regs->dx, regs->r10);
1392 return ret ?: regs->orig_ax;
1395 asmregparm void syscall_trace_leave(struct pt_regs *regs)
1399 if (unlikely(current->audit_context))
1400 audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
1402 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1403 trace_sys_exit(regs, regs->ax);
1406 * If TIF_SYSCALL_EMU is set, we only get here because of
1407 * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP).
1408 * We already reported this syscall instruction in
1409 * syscall_trace_enter().
1411 step = unlikely(test_thread_flag(TIF_SINGLESTEP)) &&
1412 !test_thread_flag(TIF_SYSCALL_EMU);
1413 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
1414 tracehook_report_syscall_exit(regs, step);