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/regset.h>
15 #include <linux/tracehook.h>
16 #include <linux/user.h>
17 #include <linux/elf.h>
18 #include <linux/security.h>
19 #include <linux/audit.h>
20 #include <linux/seccomp.h>
21 #include <linux/signal.h>
22 #include <linux/perf_event.h>
23 #include <linux/hw_breakpoint.h>
25 #include <asm/uaccess.h>
26 #include <asm/pgtable.h>
27 #include <asm/processor.h>
29 #include <asm/fpu-internal.h>
30 #include <asm/debugreg.h>
33 #include <asm/prctl.h>
34 #include <asm/proto.h>
35 #include <asm/hw_breakpoint.h>
36 #include <asm/traps.h>
40 #define CREATE_TRACE_POINTS
41 #include <trace/events/syscalls.h>
47 REGSET_IOPERM64 = REGSET_XFP,
53 struct pt_regs_offset {
58 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
59 #define REG_OFFSET_END {.name = NULL, .offset = 0}
61 static const struct pt_regs_offset regoffset_table[] = {
85 REG_OFFSET_NAME(orig_ax),
88 REG_OFFSET_NAME(flags),
95 * regs_query_register_offset() - query register offset from its name
96 * @name: the name of a register
98 * regs_query_register_offset() returns the offset of a register in struct
99 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
101 int regs_query_register_offset(const char *name)
103 const struct pt_regs_offset *roff;
104 for (roff = regoffset_table; roff->name != NULL; roff++)
105 if (!strcmp(roff->name, name))
111 * regs_query_register_name() - query register name from its offset
112 * @offset: the offset of a register in struct pt_regs.
114 * regs_query_register_name() returns the name of a register from its
115 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
117 const char *regs_query_register_name(unsigned int offset)
119 const struct pt_regs_offset *roff;
120 for (roff = regoffset_table; roff->name != NULL; roff++)
121 if (roff->offset == offset)
126 static const int arg_offs_table[] = {
128 [0] = offsetof(struct pt_regs, ax),
129 [1] = offsetof(struct pt_regs, dx),
130 [2] = offsetof(struct pt_regs, cx)
131 #else /* CONFIG_X86_64 */
132 [0] = offsetof(struct pt_regs, di),
133 [1] = offsetof(struct pt_regs, si),
134 [2] = offsetof(struct pt_regs, dx),
135 [3] = offsetof(struct pt_regs, cx),
136 [4] = offsetof(struct pt_regs, r8),
137 [5] = offsetof(struct pt_regs, r9)
142 * does not yet catch signals sent when the child dies.
143 * in exit.c or in signal.c.
147 * Determines which flags the user has access to [1 = access, 0 = no access].
149 #define FLAG_MASK_32 ((unsigned long) \
150 (X86_EFLAGS_CF | X86_EFLAGS_PF | \
151 X86_EFLAGS_AF | X86_EFLAGS_ZF | \
152 X86_EFLAGS_SF | X86_EFLAGS_TF | \
153 X86_EFLAGS_DF | X86_EFLAGS_OF | \
154 X86_EFLAGS_RF | X86_EFLAGS_AC))
157 * Determines whether a value may be installed in a segment register.
159 static inline bool invalid_selector(u16 value)
161 return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL);
166 #define FLAG_MASK FLAG_MASK_32
168 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
170 BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
171 return ®s->bx + (regno >> 2);
174 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
177 * Returning the value truncates it to 16 bits.
180 if (offset != offsetof(struct user_regs_struct, gs))
181 retval = *pt_regs_access(task_pt_regs(task), offset);
184 retval = get_user_gs(task_pt_regs(task));
186 retval = task_user_gs(task);
191 static int set_segment_reg(struct task_struct *task,
192 unsigned long offset, u16 value)
195 * The value argument was already truncated to 16 bits.
197 if (invalid_selector(value))
201 * For %cs and %ss we cannot permit a null selector.
202 * We can permit a bogus selector as long as it has USER_RPL.
203 * Null selectors are fine for other segment registers, but
204 * we will never get back to user mode with invalid %cs or %ss
205 * and will take the trap in iret instead. Much code relies
206 * on user_mode() to distinguish a user trap frame (which can
207 * safely use invalid selectors) from a kernel trap frame.
210 case offsetof(struct user_regs_struct, cs):
211 case offsetof(struct user_regs_struct, ss):
212 if (unlikely(value == 0))
216 *pt_regs_access(task_pt_regs(task), offset) = value;
219 case offsetof(struct user_regs_struct, gs):
221 set_user_gs(task_pt_regs(task), value);
223 task_user_gs(task) = value;
229 #else /* CONFIG_X86_64 */
231 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
233 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
235 BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
236 return ®s->r15 + (offset / sizeof(regs->r15));
239 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
242 * Returning the value truncates it to 16 bits.
247 case offsetof(struct user_regs_struct, fs):
248 if (task == current) {
249 /* Older gas can't assemble movq %?s,%r?? */
250 asm("movl %%fs,%0" : "=r" (seg));
253 return task->thread.fsindex;
254 case offsetof(struct user_regs_struct, gs):
255 if (task == current) {
256 asm("movl %%gs,%0" : "=r" (seg));
259 return task->thread.gsindex;
260 case offsetof(struct user_regs_struct, ds):
261 if (task == current) {
262 asm("movl %%ds,%0" : "=r" (seg));
265 return task->thread.ds;
266 case offsetof(struct user_regs_struct, es):
267 if (task == current) {
268 asm("movl %%es,%0" : "=r" (seg));
271 return task->thread.es;
273 case offsetof(struct user_regs_struct, cs):
274 case offsetof(struct user_regs_struct, ss):
277 return *pt_regs_access(task_pt_regs(task), offset);
280 static int set_segment_reg(struct task_struct *task,
281 unsigned long offset, u16 value)
284 * The value argument was already truncated to 16 bits.
286 if (invalid_selector(value))
290 case offsetof(struct user_regs_struct,fs):
292 * If this is setting fs as for normal 64-bit use but
293 * setting fs_base has implicitly changed it, leave it.
295 if ((value == FS_TLS_SEL && task->thread.fsindex == 0 &&
296 task->thread.fs != 0) ||
297 (value == 0 && task->thread.fsindex == FS_TLS_SEL &&
298 task->thread.fs == 0))
300 task->thread.fsindex = value;
302 loadsegment(fs, task->thread.fsindex);
304 case offsetof(struct user_regs_struct,gs):
306 * If this is setting gs as for normal 64-bit use but
307 * setting gs_base has implicitly changed it, leave it.
309 if ((value == GS_TLS_SEL && task->thread.gsindex == 0 &&
310 task->thread.gs != 0) ||
311 (value == 0 && task->thread.gsindex == GS_TLS_SEL &&
312 task->thread.gs == 0))
314 task->thread.gsindex = value;
316 load_gs_index(task->thread.gsindex);
318 case offsetof(struct user_regs_struct,ds):
319 task->thread.ds = value;
321 loadsegment(ds, task->thread.ds);
323 case offsetof(struct user_regs_struct,es):
324 task->thread.es = value;
326 loadsegment(es, task->thread.es);
330 * Can't actually change these in 64-bit mode.
332 case offsetof(struct user_regs_struct,cs):
333 if (unlikely(value == 0))
335 #ifdef CONFIG_IA32_EMULATION
336 if (test_tsk_thread_flag(task, TIF_IA32))
337 task_pt_regs(task)->cs = value;
340 case offsetof(struct user_regs_struct,ss):
341 if (unlikely(value == 0))
343 #ifdef CONFIG_IA32_EMULATION
344 if (test_tsk_thread_flag(task, TIF_IA32))
345 task_pt_regs(task)->ss = value;
353 #endif /* CONFIG_X86_32 */
355 static unsigned long get_flags(struct task_struct *task)
357 unsigned long retval = task_pt_regs(task)->flags;
360 * If the debugger set TF, hide it from the readout.
362 if (test_tsk_thread_flag(task, TIF_FORCED_TF))
363 retval &= ~X86_EFLAGS_TF;
368 static int set_flags(struct task_struct *task, unsigned long value)
370 struct pt_regs *regs = task_pt_regs(task);
373 * If the user value contains TF, mark that
374 * it was not "us" (the debugger) that set it.
375 * If not, make sure it stays set if we had.
377 if (value & X86_EFLAGS_TF)
378 clear_tsk_thread_flag(task, TIF_FORCED_TF);
379 else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
380 value |= X86_EFLAGS_TF;
382 regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
387 static int putreg(struct task_struct *child,
388 unsigned long offset, unsigned long value)
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 set_segment_reg(child, offset, value);
399 case offsetof(struct user_regs_struct, flags):
400 return set_flags(child, value);
403 case offsetof(struct user_regs_struct,fs_base):
404 if (value >= TASK_SIZE_OF(child))
407 * When changing the segment base, use do_arch_prctl
408 * to set either thread.fs or thread.fsindex and the
409 * corresponding GDT slot.
411 if (child->thread.fs != value)
412 return do_arch_prctl(child, ARCH_SET_FS, value);
414 case offsetof(struct user_regs_struct,gs_base):
416 * Exactly the same here as the %fs handling above.
418 if (value >= TASK_SIZE_OF(child))
420 if (child->thread.gs != value)
421 return do_arch_prctl(child, ARCH_SET_GS, value);
426 *pt_regs_access(task_pt_regs(child), offset) = value;
430 static unsigned long getreg(struct task_struct *task, unsigned long offset)
433 case offsetof(struct user_regs_struct, cs):
434 case offsetof(struct user_regs_struct, ds):
435 case offsetof(struct user_regs_struct, es):
436 case offsetof(struct user_regs_struct, fs):
437 case offsetof(struct user_regs_struct, gs):
438 case offsetof(struct user_regs_struct, ss):
439 return get_segment_reg(task, offset);
441 case offsetof(struct user_regs_struct, flags):
442 return get_flags(task);
445 case offsetof(struct user_regs_struct, fs_base): {
447 * do_arch_prctl may have used a GDT slot instead of
448 * the MSR. To userland, it appears the same either
449 * way, except the %fs segment selector might not be 0.
451 unsigned int seg = task->thread.fsindex;
452 if (task->thread.fs != 0)
453 return task->thread.fs;
455 asm("movl %%fs,%0" : "=r" (seg));
456 if (seg != FS_TLS_SEL)
458 return get_desc_base(&task->thread.tls_array[FS_TLS]);
460 case offsetof(struct user_regs_struct, gs_base): {
462 * Exactly the same here as the %fs handling above.
464 unsigned int seg = task->thread.gsindex;
465 if (task->thread.gs != 0)
466 return task->thread.gs;
468 asm("movl %%gs,%0" : "=r" (seg));
469 if (seg != GS_TLS_SEL)
471 return get_desc_base(&task->thread.tls_array[GS_TLS]);
476 return *pt_regs_access(task_pt_regs(task), offset);
479 static int genregs_get(struct task_struct *target,
480 const struct user_regset *regset,
481 unsigned int pos, unsigned int count,
482 void *kbuf, void __user *ubuf)
485 unsigned long *k = kbuf;
486 while (count >= sizeof(*k)) {
487 *k++ = getreg(target, pos);
492 unsigned long __user *u = ubuf;
493 while (count >= sizeof(*u)) {
494 if (__put_user(getreg(target, pos), u++))
504 static int genregs_set(struct task_struct *target,
505 const struct user_regset *regset,
506 unsigned int pos, unsigned int count,
507 const void *kbuf, const void __user *ubuf)
511 const unsigned long *k = kbuf;
512 while (count >= sizeof(*k) && !ret) {
513 ret = putreg(target, pos, *k++);
518 const unsigned long __user *u = ubuf;
519 while (count >= sizeof(*u) && !ret) {
521 ret = __get_user(word, u++);
524 ret = putreg(target, pos, word);
532 static void ptrace_triggered(struct perf_event *bp,
533 struct perf_sample_data *data,
534 struct pt_regs *regs)
537 struct thread_struct *thread = &(current->thread);
540 * Store in the virtual DR6 register the fact that the breakpoint
541 * was hit so the thread's debugger will see it.
543 for (i = 0; i < HBP_NUM; i++) {
544 if (thread->ptrace_bps[i] == bp)
548 thread->debugreg6 |= (DR_TRAP0 << i);
552 * Walk through every ptrace breakpoints for this thread and
553 * build the dr7 value on top of their attributes.
556 static unsigned long ptrace_get_dr7(struct perf_event *bp[])
560 struct arch_hw_breakpoint *info;
562 for (i = 0; i < HBP_NUM; i++) {
563 if (bp[i] && !bp[i]->attr.disabled) {
564 info = counter_arch_bp(bp[i]);
565 dr7 |= encode_dr7(i, info->len, info->type);
573 ptrace_modify_breakpoint(struct perf_event *bp, int len, int type,
574 struct task_struct *tsk, int disabled)
577 int gen_len, gen_type;
578 struct perf_event_attr attr;
581 * We should have at least an inactive breakpoint at this
582 * slot. It means the user is writing dr7 without having
583 * written the address register first
588 err = arch_bp_generic_fields(len, type, &gen_len, &gen_type);
593 attr.bp_len = gen_len;
594 attr.bp_type = gen_type;
595 attr.disabled = disabled;
597 return modify_user_hw_breakpoint(bp, &attr);
601 * Handle ptrace writes to debug register 7.
603 static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data)
605 struct thread_struct *thread = &(tsk->thread);
606 unsigned long old_dr7;
607 int i, orig_ret = 0, rc = 0;
608 int enabled, second_pass = 0;
610 struct perf_event *bp;
612 if (ptrace_get_breakpoints(tsk) < 0)
615 data &= ~DR_CONTROL_RESERVED;
616 old_dr7 = ptrace_get_dr7(thread->ptrace_bps);
619 * Loop through all the hardware breakpoints, making the
620 * appropriate changes to each.
622 for (i = 0; i < HBP_NUM; i++) {
623 enabled = decode_dr7(data, i, &len, &type);
624 bp = thread->ptrace_bps[i];
629 * Don't unregister the breakpoints right-away,
630 * unless all register_user_hw_breakpoint()
631 * requests have succeeded. This prevents
632 * any window of opportunity for debug
633 * register grabbing by other users.
638 rc = ptrace_modify_breakpoint(bp, len, type,
646 rc = ptrace_modify_breakpoint(bp, len, type, tsk, 0);
651 * Make a second pass to free the remaining unused breakpoints
652 * or to restore the original breakpoints if an error occurred.
663 ptrace_put_breakpoints(tsk);
665 return ((orig_ret < 0) ? orig_ret : rc);
669 * Handle PTRACE_PEEKUSR calls for the debug register area.
671 static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
673 struct thread_struct *thread = &(tsk->thread);
674 unsigned long val = 0;
677 struct perf_event *bp;
679 if (ptrace_get_breakpoints(tsk) < 0)
682 bp = thread->ptrace_bps[n];
686 val = bp->hw.info.address;
688 ptrace_put_breakpoints(tsk);
690 val = thread->debugreg6;
692 val = thread->ptrace_dr7;
697 static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr,
700 struct perf_event *bp;
701 struct thread_struct *t = &tsk->thread;
702 struct perf_event_attr attr;
705 if (ptrace_get_breakpoints(tsk) < 0)
708 if (!t->ptrace_bps[nr]) {
709 ptrace_breakpoint_init(&attr);
711 * Put stub len and type to register (reserve) an inactive but
715 attr.bp_len = HW_BREAKPOINT_LEN_1;
716 attr.bp_type = HW_BREAKPOINT_W;
719 bp = register_user_hw_breakpoint(&attr, ptrace_triggered,
723 * CHECKME: the previous code returned -EIO if the addr wasn't
724 * a valid task virtual addr. The new one will return -EINVAL in
726 * -EINVAL may be what we want for in-kernel breakpoints users,
727 * but -EIO looks better for ptrace, since we refuse a register
728 * writing for the user. And anyway this is the previous
736 t->ptrace_bps[nr] = bp;
738 bp = t->ptrace_bps[nr];
742 err = modify_user_hw_breakpoint(bp, &attr);
746 ptrace_put_breakpoints(tsk);
751 * Handle PTRACE_POKEUSR calls for the debug register area.
753 static int ptrace_set_debugreg(struct task_struct *tsk, int n,
756 struct thread_struct *thread = &(tsk->thread);
759 /* There are no DR4 or DR5 registers */
760 if (n == 4 || n == 5)
764 thread->debugreg6 = val;
768 rc = ptrace_set_breakpoint_addr(tsk, n, val);
772 /* All that's left is DR7 */
774 rc = ptrace_write_dr7(tsk, val);
776 thread->ptrace_dr7 = val;
784 * These access the current or another (stopped) task's io permission
785 * bitmap for debugging or core dump.
787 static int ioperm_active(struct task_struct *target,
788 const struct user_regset *regset)
790 return target->thread.io_bitmap_max / regset->size;
793 static int ioperm_get(struct task_struct *target,
794 const struct user_regset *regset,
795 unsigned int pos, unsigned int count,
796 void *kbuf, void __user *ubuf)
798 if (!target->thread.io_bitmap_ptr)
801 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
802 target->thread.io_bitmap_ptr,
807 * Called by kernel/ptrace.c when detaching..
809 * Make sure the single step bit is not set.
811 void ptrace_disable(struct task_struct *child)
813 user_disable_single_step(child);
814 #ifdef TIF_SYSCALL_EMU
815 clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
819 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
820 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
823 long arch_ptrace(struct task_struct *child, long request,
824 unsigned long addr, unsigned long data)
827 unsigned long __user *datap = (unsigned long __user *)data;
830 /* read the word at location addr in the USER area. */
831 case PTRACE_PEEKUSR: {
835 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
838 tmp = 0; /* Default return condition */
839 if (addr < sizeof(struct user_regs_struct))
840 tmp = getreg(child, addr);
841 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
842 addr <= offsetof(struct user, u_debugreg[7])) {
843 addr -= offsetof(struct user, u_debugreg[0]);
844 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
846 ret = put_user(tmp, datap);
850 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
852 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
855 if (addr < sizeof(struct user_regs_struct))
856 ret = putreg(child, addr, data);
857 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
858 addr <= offsetof(struct user, u_debugreg[7])) {
859 addr -= offsetof(struct user, u_debugreg[0]);
860 ret = ptrace_set_debugreg(child,
861 addr / sizeof(data), data);
865 case PTRACE_GETREGS: /* Get all gp regs from the child. */
866 return copy_regset_to_user(child,
867 task_user_regset_view(current),
869 0, sizeof(struct user_regs_struct),
872 case PTRACE_SETREGS: /* Set all gp regs in the child. */
873 return copy_regset_from_user(child,
874 task_user_regset_view(current),
876 0, sizeof(struct user_regs_struct),
879 case PTRACE_GETFPREGS: /* Get the child FPU state. */
880 return copy_regset_to_user(child,
881 task_user_regset_view(current),
883 0, sizeof(struct user_i387_struct),
886 case PTRACE_SETFPREGS: /* Set the child FPU state. */
887 return copy_regset_from_user(child,
888 task_user_regset_view(current),
890 0, sizeof(struct user_i387_struct),
894 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
895 return copy_regset_to_user(child, &user_x86_32_view,
897 0, sizeof(struct user_fxsr_struct),
900 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
901 return copy_regset_from_user(child, &user_x86_32_view,
903 0, sizeof(struct user_fxsr_struct),
907 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
908 case PTRACE_GET_THREAD_AREA:
911 ret = do_get_thread_area(child, addr,
912 (struct user_desc __user *)data);
915 case PTRACE_SET_THREAD_AREA:
918 ret = do_set_thread_area(child, addr,
919 (struct user_desc __user *)data, 0);
924 /* normal 64bit interface to access TLS data.
925 Works just like arch_prctl, except that the arguments
927 case PTRACE_ARCH_PRCTL:
928 ret = do_arch_prctl(child, data, addr);
933 ret = ptrace_request(child, request, addr, data);
940 #ifdef CONFIG_IA32_EMULATION
942 #include <linux/compat.h>
943 #include <linux/syscalls.h>
944 #include <asm/ia32.h>
945 #include <asm/user32.h>
948 case offsetof(struct user32, regs.l): \
949 regs->q = value; break
952 case offsetof(struct user32, regs.rs): \
953 return set_segment_reg(child, \
954 offsetof(struct user_regs_struct, rs), \
958 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
960 struct pt_regs *regs = task_pt_regs(child);
981 case offsetof(struct user32, regs.orig_eax):
983 * A 32-bit debugger setting orig_eax means to restore
984 * the state of the task restarting a 32-bit syscall.
985 * Make sure we interpret the -ERESTART* codes correctly
986 * in case the task is not actually still sitting at the
987 * exit from a 32-bit syscall with TS_COMPAT still set.
989 regs->orig_ax = value;
990 if (syscall_get_nr(child, regs) >= 0)
991 task_thread_info(child)->status |= TS_COMPAT;
994 case offsetof(struct user32, regs.eflags):
995 return set_flags(child, value);
997 case offsetof(struct user32, u_debugreg[0]) ...
998 offsetof(struct user32, u_debugreg[7]):
999 regno -= offsetof(struct user32, u_debugreg[0]);
1000 return ptrace_set_debugreg(child, regno / 4, value);
1003 if (regno > sizeof(struct user32) || (regno & 3))
1007 * Other dummy fields in the virtual user structure
1019 case offsetof(struct user32, regs.l): \
1020 *val = regs->q; break
1023 case offsetof(struct user32, regs.rs): \
1024 *val = get_segment_reg(child, \
1025 offsetof(struct user_regs_struct, rs)); \
1028 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
1030 struct pt_regs *regs = task_pt_regs(child);
1048 R32(orig_eax, orig_ax);
1052 case offsetof(struct user32, regs.eflags):
1053 *val = get_flags(child);
1056 case offsetof(struct user32, u_debugreg[0]) ...
1057 offsetof(struct user32, u_debugreg[7]):
1058 regno -= offsetof(struct user32, u_debugreg[0]);
1059 *val = ptrace_get_debugreg(child, regno / 4);
1063 if (regno > sizeof(struct user32) || (regno & 3))
1067 * Other dummy fields in the virtual user structure
1079 static int genregs32_get(struct task_struct *target,
1080 const struct user_regset *regset,
1081 unsigned int pos, unsigned int count,
1082 void *kbuf, void __user *ubuf)
1085 compat_ulong_t *k = kbuf;
1086 while (count >= sizeof(*k)) {
1087 getreg32(target, pos, k++);
1088 count -= sizeof(*k);
1092 compat_ulong_t __user *u = ubuf;
1093 while (count >= sizeof(*u)) {
1094 compat_ulong_t word;
1095 getreg32(target, pos, &word);
1096 if (__put_user(word, u++))
1098 count -= sizeof(*u);
1106 static int genregs32_set(struct task_struct *target,
1107 const struct user_regset *regset,
1108 unsigned int pos, unsigned int count,
1109 const void *kbuf, const void __user *ubuf)
1113 const compat_ulong_t *k = kbuf;
1114 while (count >= sizeof(*k) && !ret) {
1115 ret = putreg32(target, pos, *k++);
1116 count -= sizeof(*k);
1120 const compat_ulong_t __user *u = ubuf;
1121 while (count >= sizeof(*u) && !ret) {
1122 compat_ulong_t word;
1123 ret = __get_user(word, u++);
1126 ret = putreg32(target, pos, word);
1127 count -= sizeof(*u);
1134 #ifdef CONFIG_X86_X32_ABI
1135 static long x32_arch_ptrace(struct task_struct *child,
1136 compat_long_t request, compat_ulong_t caddr,
1137 compat_ulong_t cdata)
1139 unsigned long addr = caddr;
1140 unsigned long data = cdata;
1141 void __user *datap = compat_ptr(data);
1145 /* Read 32bits at location addr in the USER area. Only allow
1146 to return the lower 32bits of segment and debug registers. */
1147 case PTRACE_PEEKUSR: {
1151 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1152 addr < offsetof(struct user_regs_struct, cs))
1155 tmp = 0; /* Default return condition */
1156 if (addr < sizeof(struct user_regs_struct))
1157 tmp = getreg(child, addr);
1158 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1159 addr <= offsetof(struct user, u_debugreg[7])) {
1160 addr -= offsetof(struct user, u_debugreg[0]);
1161 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
1163 ret = put_user(tmp, (__u32 __user *)datap);
1167 /* Write the word at location addr in the USER area. Only allow
1168 to update segment and debug registers with the upper 32bits
1170 case PTRACE_POKEUSR:
1172 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) ||
1173 addr < offsetof(struct user_regs_struct, cs))
1176 if (addr < sizeof(struct user_regs_struct))
1177 ret = putreg(child, addr, data);
1178 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
1179 addr <= offsetof(struct user, u_debugreg[7])) {
1180 addr -= offsetof(struct user, u_debugreg[0]);
1181 ret = ptrace_set_debugreg(child,
1182 addr / sizeof(data), data);
1186 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1187 return copy_regset_to_user(child,
1188 task_user_regset_view(current),
1190 0, sizeof(struct user_regs_struct),
1193 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1194 return copy_regset_from_user(child,
1195 task_user_regset_view(current),
1197 0, sizeof(struct user_regs_struct),
1200 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1201 return copy_regset_to_user(child,
1202 task_user_regset_view(current),
1204 0, sizeof(struct user_i387_struct),
1207 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1208 return copy_regset_from_user(child,
1209 task_user_regset_view(current),
1211 0, sizeof(struct user_i387_struct),
1214 /* normal 64bit interface to access TLS data.
1215 Works just like arch_prctl, except that the arguments
1217 case PTRACE_ARCH_PRCTL:
1218 return do_arch_prctl(child, data, addr);
1221 return compat_ptrace_request(child, request, addr, data);
1228 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1229 compat_ulong_t caddr, compat_ulong_t cdata)
1231 unsigned long addr = caddr;
1232 unsigned long data = cdata;
1233 void __user *datap = compat_ptr(data);
1237 #ifdef CONFIG_X86_X32_ABI
1238 if (!is_ia32_task())
1239 return x32_arch_ptrace(child, request, caddr, cdata);
1243 case PTRACE_PEEKUSR:
1244 ret = getreg32(child, addr, &val);
1246 ret = put_user(val, (__u32 __user *)datap);
1249 case PTRACE_POKEUSR:
1250 ret = putreg32(child, addr, data);
1253 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1254 return copy_regset_to_user(child, &user_x86_32_view,
1256 0, sizeof(struct user_regs_struct32),
1259 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1260 return copy_regset_from_user(child, &user_x86_32_view,
1262 sizeof(struct user_regs_struct32),
1265 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1266 return copy_regset_to_user(child, &user_x86_32_view,
1268 sizeof(struct user_i387_ia32_struct),
1271 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1272 return copy_regset_from_user(
1273 child, &user_x86_32_view, REGSET_FP,
1274 0, sizeof(struct user_i387_ia32_struct), datap);
1276 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1277 return copy_regset_to_user(child, &user_x86_32_view,
1279 sizeof(struct user32_fxsr_struct),
1282 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1283 return copy_regset_from_user(child, &user_x86_32_view,
1285 sizeof(struct user32_fxsr_struct),
1288 case PTRACE_GET_THREAD_AREA:
1289 case PTRACE_SET_THREAD_AREA:
1290 return arch_ptrace(child, request, addr, data);
1293 return compat_ptrace_request(child, request, addr, data);
1299 #endif /* CONFIG_IA32_EMULATION */
1301 #ifdef CONFIG_X86_64
1303 static struct user_regset x86_64_regsets[] __read_mostly = {
1304 [REGSET_GENERAL] = {
1305 .core_note_type = NT_PRSTATUS,
1306 .n = sizeof(struct user_regs_struct) / sizeof(long),
1307 .size = sizeof(long), .align = sizeof(long),
1308 .get = genregs_get, .set = genregs_set
1311 .core_note_type = NT_PRFPREG,
1312 .n = sizeof(struct user_i387_struct) / sizeof(long),
1313 .size = sizeof(long), .align = sizeof(long),
1314 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
1317 .core_note_type = NT_X86_XSTATE,
1318 .size = sizeof(u64), .align = sizeof(u64),
1319 .active = xstateregs_active, .get = xstateregs_get,
1320 .set = xstateregs_set
1322 [REGSET_IOPERM64] = {
1323 .core_note_type = NT_386_IOPERM,
1324 .n = IO_BITMAP_LONGS,
1325 .size = sizeof(long), .align = sizeof(long),
1326 .active = ioperm_active, .get = ioperm_get
1330 static const struct user_regset_view user_x86_64_view = {
1331 .name = "x86_64", .e_machine = EM_X86_64,
1332 .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1335 #else /* CONFIG_X86_32 */
1337 #define user_regs_struct32 user_regs_struct
1338 #define genregs32_get genregs_get
1339 #define genregs32_set genregs_set
1341 #define user_i387_ia32_struct user_i387_struct
1342 #define user32_fxsr_struct user_fxsr_struct
1344 #endif /* CONFIG_X86_64 */
1346 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1347 static struct user_regset x86_32_regsets[] __read_mostly = {
1348 [REGSET_GENERAL] = {
1349 .core_note_type = NT_PRSTATUS,
1350 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1351 .size = sizeof(u32), .align = sizeof(u32),
1352 .get = genregs32_get, .set = genregs32_set
1355 .core_note_type = NT_PRFPREG,
1356 .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32),
1357 .size = sizeof(u32), .align = sizeof(u32),
1358 .active = fpregs_active, .get = fpregs_get, .set = fpregs_set
1361 .core_note_type = NT_PRXFPREG,
1362 .n = sizeof(struct user32_fxsr_struct) / sizeof(u32),
1363 .size = sizeof(u32), .align = sizeof(u32),
1364 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
1367 .core_note_type = NT_X86_XSTATE,
1368 .size = sizeof(u64), .align = sizeof(u64),
1369 .active = xstateregs_active, .get = xstateregs_get,
1370 .set = xstateregs_set
1373 .core_note_type = NT_386_TLS,
1374 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1375 .size = sizeof(struct user_desc),
1376 .align = sizeof(struct user_desc),
1377 .active = regset_tls_active,
1378 .get = regset_tls_get, .set = regset_tls_set
1380 [REGSET_IOPERM32] = {
1381 .core_note_type = NT_386_IOPERM,
1382 .n = IO_BITMAP_BYTES / sizeof(u32),
1383 .size = sizeof(u32), .align = sizeof(u32),
1384 .active = ioperm_active, .get = ioperm_get
1388 static const struct user_regset_view user_x86_32_view = {
1389 .name = "i386", .e_machine = EM_386,
1390 .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1395 * This represents bytes 464..511 in the memory layout exported through
1396 * the REGSET_XSTATE interface.
1398 u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
1400 void update_regset_xstate_info(unsigned int size, u64 xstate_mask)
1402 #ifdef CONFIG_X86_64
1403 x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1405 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1406 x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1408 xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask;
1411 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1413 #ifdef CONFIG_IA32_EMULATION
1414 if (test_tsk_thread_flag(task, TIF_IA32))
1416 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1417 return &user_x86_32_view;
1419 #ifdef CONFIG_X86_64
1420 return &user_x86_64_view;
1424 static void fill_sigtrap_info(struct task_struct *tsk,
1425 struct pt_regs *regs,
1426 int error_code, int si_code,
1427 struct siginfo *info)
1429 tsk->thread.trap_nr = X86_TRAP_DB;
1430 tsk->thread.error_code = error_code;
1432 memset(info, 0, sizeof(*info));
1433 info->si_signo = SIGTRAP;
1434 info->si_code = si_code;
1435 info->si_addr = user_mode_vm(regs) ? (void __user *)regs->ip : NULL;
1438 void user_single_step_siginfo(struct task_struct *tsk,
1439 struct pt_regs *regs,
1440 struct siginfo *info)
1442 fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info);
1445 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
1446 int error_code, int si_code)
1448 struct siginfo info;
1450 fill_sigtrap_info(tsk, regs, error_code, si_code, &info);
1451 /* Send us the fake SIGTRAP */
1452 force_sig_info(SIGTRAP, &info, tsk);
1456 #ifdef CONFIG_X86_32
1458 #elif defined CONFIG_IA32_EMULATION
1459 # define IS_IA32 is_compat_task()
1465 * We must return the syscall number to actually look up in the table.
1466 * This can be -1L to skip running any syscall at all.
1468 long syscall_trace_enter(struct pt_regs *regs)
1473 * If we stepped into a sysenter/syscall insn, it trapped in
1474 * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP.
1475 * If user-mode had set TF itself, then it's still clear from
1476 * do_debug() and we need to set it again to restore the user
1477 * state. If we entered on the slow path, TF was already set.
1479 if (test_thread_flag(TIF_SINGLESTEP))
1480 regs->flags |= X86_EFLAGS_TF;
1482 /* do the secure computing check first */
1483 if (secure_computing(regs->orig_ax)) {
1484 /* seccomp failures shouldn't expose any additional code. */
1489 if (unlikely(test_thread_flag(TIF_SYSCALL_EMU)))
1492 if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) &&
1493 tracehook_report_syscall_entry(regs))
1496 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1497 trace_sys_enter(regs, regs->orig_ax);
1500 audit_syscall_entry(AUDIT_ARCH_I386,
1503 regs->dx, regs->si);
1504 #ifdef CONFIG_X86_64
1506 audit_syscall_entry(AUDIT_ARCH_X86_64,
1509 regs->dx, regs->r10);
1513 return ret ?: regs->orig_ax;
1516 void syscall_trace_leave(struct pt_regs *regs)
1520 audit_syscall_exit(regs);
1522 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1523 trace_sys_exit(regs, regs->ax);
1526 * If TIF_SYSCALL_EMU is set, we only get here because of
1527 * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP).
1528 * We already reported this syscall instruction in
1529 * syscall_trace_enter().
1531 step = unlikely(test_thread_flag(TIF_SINGLESTEP)) &&
1532 !test_thread_flag(TIF_SYSCALL_EMU);
1533 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
1534 tracehook_report_syscall_exit(regs, step);