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/system.h>
28 #include <asm/processor.h>
30 #include <asm/debugreg.h>
33 #include <asm/prctl.h>
34 #include <asm/proto.h>
35 #include <asm/hw_breakpoint.h>
39 #define CREATE_TRACE_POINTS
40 #include <trace/events/syscalls.h>
46 REGSET_IOPERM64 = REGSET_XFP,
52 struct pt_regs_offset {
57 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
58 #define REG_OFFSET_END {.name = NULL, .offset = 0}
60 static const struct pt_regs_offset regoffset_table[] = {
84 REG_OFFSET_NAME(orig_ax),
87 REG_OFFSET_NAME(flags),
94 * regs_query_register_offset() - query register offset from its name
95 * @name: the name of a register
97 * regs_query_register_offset() returns the offset of a register in struct
98 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
100 int regs_query_register_offset(const char *name)
102 const struct pt_regs_offset *roff;
103 for (roff = regoffset_table; roff->name != NULL; roff++)
104 if (!strcmp(roff->name, name))
110 * regs_query_register_name() - query register name from its offset
111 * @offset: the offset of a register in struct pt_regs.
113 * regs_query_register_name() returns the name of a register from its
114 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
116 const char *regs_query_register_name(unsigned int offset)
118 const struct pt_regs_offset *roff;
119 for (roff = regoffset_table; roff->name != NULL; roff++)
120 if (roff->offset == offset)
125 static const int arg_offs_table[] = {
127 [0] = offsetof(struct pt_regs, ax),
128 [1] = offsetof(struct pt_regs, dx),
129 [2] = offsetof(struct pt_regs, cx)
130 #else /* CONFIG_X86_64 */
131 [0] = offsetof(struct pt_regs, di),
132 [1] = offsetof(struct pt_regs, si),
133 [2] = offsetof(struct pt_regs, dx),
134 [3] = offsetof(struct pt_regs, cx),
135 [4] = offsetof(struct pt_regs, r8),
136 [5] = offsetof(struct pt_regs, r9)
141 * does not yet catch signals sent when the child dies.
142 * in exit.c or in signal.c.
146 * Determines which flags the user has access to [1 = access, 0 = no access].
148 #define FLAG_MASK_32 ((unsigned long) \
149 (X86_EFLAGS_CF | X86_EFLAGS_PF | \
150 X86_EFLAGS_AF | X86_EFLAGS_ZF | \
151 X86_EFLAGS_SF | X86_EFLAGS_TF | \
152 X86_EFLAGS_DF | X86_EFLAGS_OF | \
153 X86_EFLAGS_RF | X86_EFLAGS_AC))
156 * Determines whether a value may be installed in a segment register.
158 static inline bool invalid_selector(u16 value)
160 return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL);
165 #define FLAG_MASK FLAG_MASK_32
167 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno)
169 BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0);
170 return ®s->bx + (regno >> 2);
173 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
176 * Returning the value truncates it to 16 bits.
179 if (offset != offsetof(struct user_regs_struct, gs))
180 retval = *pt_regs_access(task_pt_regs(task), offset);
183 retval = get_user_gs(task_pt_regs(task));
185 retval = task_user_gs(task);
190 static int set_segment_reg(struct task_struct *task,
191 unsigned long offset, u16 value)
194 * The value argument was already truncated to 16 bits.
196 if (invalid_selector(value))
200 * For %cs and %ss we cannot permit a null selector.
201 * We can permit a bogus selector as long as it has USER_RPL.
202 * Null selectors are fine for other segment registers, but
203 * we will never get back to user mode with invalid %cs or %ss
204 * and will take the trap in iret instead. Much code relies
205 * on user_mode() to distinguish a user trap frame (which can
206 * safely use invalid selectors) from a kernel trap frame.
209 case offsetof(struct user_regs_struct, cs):
210 case offsetof(struct user_regs_struct, ss):
211 if (unlikely(value == 0))
215 *pt_regs_access(task_pt_regs(task), offset) = value;
218 case offsetof(struct user_regs_struct, gs):
220 set_user_gs(task_pt_regs(task), value);
222 task_user_gs(task) = value;
228 #else /* CONFIG_X86_64 */
230 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
232 static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset)
234 BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0);
235 return ®s->r15 + (offset / sizeof(regs->r15));
238 static u16 get_segment_reg(struct task_struct *task, unsigned long offset)
241 * Returning the value truncates it to 16 bits.
246 case offsetof(struct user_regs_struct, fs):
247 if (task == current) {
248 /* Older gas can't assemble movq %?s,%r?? */
249 asm("movl %%fs,%0" : "=r" (seg));
252 return task->thread.fsindex;
253 case offsetof(struct user_regs_struct, gs):
254 if (task == current) {
255 asm("movl %%gs,%0" : "=r" (seg));
258 return task->thread.gsindex;
259 case offsetof(struct user_regs_struct, ds):
260 if (task == current) {
261 asm("movl %%ds,%0" : "=r" (seg));
264 return task->thread.ds;
265 case offsetof(struct user_regs_struct, es):
266 if (task == current) {
267 asm("movl %%es,%0" : "=r" (seg));
270 return task->thread.es;
272 case offsetof(struct user_regs_struct, cs):
273 case offsetof(struct user_regs_struct, ss):
276 return *pt_regs_access(task_pt_regs(task), offset);
279 static int set_segment_reg(struct task_struct *task,
280 unsigned long offset, u16 value)
283 * The value argument was already truncated to 16 bits.
285 if (invalid_selector(value))
289 case offsetof(struct user_regs_struct,fs):
291 * If this is setting fs as for normal 64-bit use but
292 * setting fs_base has implicitly changed it, leave it.
294 if ((value == FS_TLS_SEL && task->thread.fsindex == 0 &&
295 task->thread.fs != 0) ||
296 (value == 0 && task->thread.fsindex == FS_TLS_SEL &&
297 task->thread.fs == 0))
299 task->thread.fsindex = value;
301 loadsegment(fs, task->thread.fsindex);
303 case offsetof(struct user_regs_struct,gs):
305 * If this is setting gs as for normal 64-bit use but
306 * setting gs_base has implicitly changed it, leave it.
308 if ((value == GS_TLS_SEL && task->thread.gsindex == 0 &&
309 task->thread.gs != 0) ||
310 (value == 0 && task->thread.gsindex == GS_TLS_SEL &&
311 task->thread.gs == 0))
313 task->thread.gsindex = value;
315 load_gs_index(task->thread.gsindex);
317 case offsetof(struct user_regs_struct,ds):
318 task->thread.ds = value;
320 loadsegment(ds, task->thread.ds);
322 case offsetof(struct user_regs_struct,es):
323 task->thread.es = value;
325 loadsegment(es, task->thread.es);
329 * Can't actually change these in 64-bit mode.
331 case offsetof(struct user_regs_struct,cs):
332 if (unlikely(value == 0))
334 #ifdef CONFIG_IA32_EMULATION
335 if (test_tsk_thread_flag(task, TIF_IA32))
336 task_pt_regs(task)->cs = value;
339 case offsetof(struct user_regs_struct,ss):
340 if (unlikely(value == 0))
342 #ifdef CONFIG_IA32_EMULATION
343 if (test_tsk_thread_flag(task, TIF_IA32))
344 task_pt_regs(task)->ss = value;
352 #endif /* CONFIG_X86_32 */
354 static unsigned long get_flags(struct task_struct *task)
356 unsigned long retval = task_pt_regs(task)->flags;
359 * If the debugger set TF, hide it from the readout.
361 if (test_tsk_thread_flag(task, TIF_FORCED_TF))
362 retval &= ~X86_EFLAGS_TF;
367 static int set_flags(struct task_struct *task, unsigned long value)
369 struct pt_regs *regs = task_pt_regs(task);
372 * If the user value contains TF, mark that
373 * it was not "us" (the debugger) that set it.
374 * If not, make sure it stays set if we had.
376 if (value & X86_EFLAGS_TF)
377 clear_tsk_thread_flag(task, TIF_FORCED_TF);
378 else if (test_tsk_thread_flag(task, TIF_FORCED_TF))
379 value |= X86_EFLAGS_TF;
381 regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK);
386 static int putreg(struct task_struct *child,
387 unsigned long offset, unsigned long value)
390 case offsetof(struct user_regs_struct, cs):
391 case offsetof(struct user_regs_struct, ds):
392 case offsetof(struct user_regs_struct, es):
393 case offsetof(struct user_regs_struct, fs):
394 case offsetof(struct user_regs_struct, gs):
395 case offsetof(struct user_regs_struct, ss):
396 return set_segment_reg(child, offset, value);
398 case offsetof(struct user_regs_struct, flags):
399 return set_flags(child, value);
402 case offsetof(struct user_regs_struct,fs_base):
403 if (value >= TASK_SIZE_OF(child))
406 * When changing the segment base, use do_arch_prctl
407 * to set either thread.fs or thread.fsindex and the
408 * corresponding GDT slot.
410 if (child->thread.fs != value)
411 return do_arch_prctl(child, ARCH_SET_FS, value);
413 case offsetof(struct user_regs_struct,gs_base):
415 * Exactly the same here as the %fs handling above.
417 if (value >= TASK_SIZE_OF(child))
419 if (child->thread.gs != value)
420 return do_arch_prctl(child, ARCH_SET_GS, value);
425 *pt_regs_access(task_pt_regs(child), offset) = value;
429 static unsigned long getreg(struct task_struct *task, unsigned long offset)
432 case offsetof(struct user_regs_struct, cs):
433 case offsetof(struct user_regs_struct, ds):
434 case offsetof(struct user_regs_struct, es):
435 case offsetof(struct user_regs_struct, fs):
436 case offsetof(struct user_regs_struct, gs):
437 case offsetof(struct user_regs_struct, ss):
438 return get_segment_reg(task, offset);
440 case offsetof(struct user_regs_struct, flags):
441 return get_flags(task);
444 case offsetof(struct user_regs_struct, fs_base): {
446 * do_arch_prctl may have used a GDT slot instead of
447 * the MSR. To userland, it appears the same either
448 * way, except the %fs segment selector might not be 0.
450 unsigned int seg = task->thread.fsindex;
451 if (task->thread.fs != 0)
452 return task->thread.fs;
454 asm("movl %%fs,%0" : "=r" (seg));
455 if (seg != FS_TLS_SEL)
457 return get_desc_base(&task->thread.tls_array[FS_TLS]);
459 case offsetof(struct user_regs_struct, gs_base): {
461 * Exactly the same here as the %fs handling above.
463 unsigned int seg = task->thread.gsindex;
464 if (task->thread.gs != 0)
465 return task->thread.gs;
467 asm("movl %%gs,%0" : "=r" (seg));
468 if (seg != GS_TLS_SEL)
470 return get_desc_base(&task->thread.tls_array[GS_TLS]);
475 return *pt_regs_access(task_pt_regs(task), offset);
478 static int genregs_get(struct task_struct *target,
479 const struct user_regset *regset,
480 unsigned int pos, unsigned int count,
481 void *kbuf, void __user *ubuf)
484 unsigned long *k = kbuf;
485 while (count >= sizeof(*k)) {
486 *k++ = getreg(target, pos);
491 unsigned long __user *u = ubuf;
492 while (count >= sizeof(*u)) {
493 if (__put_user(getreg(target, pos), u++))
503 static int genregs_set(struct task_struct *target,
504 const struct user_regset *regset,
505 unsigned int pos, unsigned int count,
506 const void *kbuf, const void __user *ubuf)
510 const unsigned long *k = kbuf;
511 while (count >= sizeof(*k) && !ret) {
512 ret = putreg(target, pos, *k++);
517 const unsigned long __user *u = ubuf;
518 while (count >= sizeof(*u) && !ret) {
520 ret = __get_user(word, u++);
523 ret = putreg(target, pos, word);
531 static void ptrace_triggered(struct perf_event *bp,
532 struct perf_sample_data *data,
533 struct pt_regs *regs)
536 struct thread_struct *thread = &(current->thread);
539 * Store in the virtual DR6 register the fact that the breakpoint
540 * was hit so the thread's debugger will see it.
542 for (i = 0; i < HBP_NUM; i++) {
543 if (thread->ptrace_bps[i] == bp)
547 thread->debugreg6 |= (DR_TRAP0 << i);
551 * Walk through every ptrace breakpoints for this thread and
552 * build the dr7 value on top of their attributes.
555 static unsigned long ptrace_get_dr7(struct perf_event *bp[])
559 struct arch_hw_breakpoint *info;
561 for (i = 0; i < HBP_NUM; i++) {
562 if (bp[i] && !bp[i]->attr.disabled) {
563 info = counter_arch_bp(bp[i]);
564 dr7 |= encode_dr7(i, info->len, info->type);
572 ptrace_modify_breakpoint(struct perf_event *bp, int len, int type,
573 struct task_struct *tsk, int disabled)
576 int gen_len, gen_type;
577 struct perf_event_attr attr;
580 * We should have at least an inactive breakpoint at this
581 * slot. It means the user is writing dr7 without having
582 * written the address register first
587 err = arch_bp_generic_fields(len, type, &gen_len, &gen_type);
592 attr.bp_len = gen_len;
593 attr.bp_type = gen_type;
594 attr.disabled = disabled;
596 return modify_user_hw_breakpoint(bp, &attr);
600 * Handle ptrace writes to debug register 7.
602 static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data)
604 struct thread_struct *thread = &(tsk->thread);
605 unsigned long old_dr7;
606 int i, orig_ret = 0, rc = 0;
607 int enabled, second_pass = 0;
609 struct perf_event *bp;
611 if (ptrace_get_breakpoints(tsk) < 0)
614 data &= ~DR_CONTROL_RESERVED;
615 old_dr7 = ptrace_get_dr7(thread->ptrace_bps);
618 * Loop through all the hardware breakpoints, making the
619 * appropriate changes to each.
621 for (i = 0; i < HBP_NUM; i++) {
622 enabled = decode_dr7(data, i, &len, &type);
623 bp = thread->ptrace_bps[i];
628 * Don't unregister the breakpoints right-away,
629 * unless all register_user_hw_breakpoint()
630 * requests have succeeded. This prevents
631 * any window of opportunity for debug
632 * register grabbing by other users.
637 rc = ptrace_modify_breakpoint(bp, len, type,
645 rc = ptrace_modify_breakpoint(bp, len, type, tsk, 0);
650 * Make a second pass to free the remaining unused breakpoints
651 * or to restore the original breakpoints if an error occurred.
662 ptrace_put_breakpoints(tsk);
664 return ((orig_ret < 0) ? orig_ret : rc);
668 * Handle PTRACE_PEEKUSR calls for the debug register area.
670 static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
672 struct thread_struct *thread = &(tsk->thread);
673 unsigned long val = 0;
676 struct perf_event *bp;
678 if (ptrace_get_breakpoints(tsk) < 0)
681 bp = thread->ptrace_bps[n];
685 val = bp->hw.info.address;
687 ptrace_put_breakpoints(tsk);
689 val = thread->debugreg6;
691 val = thread->ptrace_dr7;
696 static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr,
699 struct perf_event *bp;
700 struct thread_struct *t = &tsk->thread;
701 struct perf_event_attr attr;
704 if (ptrace_get_breakpoints(tsk) < 0)
707 if (!t->ptrace_bps[nr]) {
708 ptrace_breakpoint_init(&attr);
710 * Put stub len and type to register (reserve) an inactive but
714 attr.bp_len = HW_BREAKPOINT_LEN_1;
715 attr.bp_type = HW_BREAKPOINT_W;
718 bp = register_user_hw_breakpoint(&attr, ptrace_triggered,
722 * CHECKME: the previous code returned -EIO if the addr wasn't
723 * a valid task virtual addr. The new one will return -EINVAL in
725 * -EINVAL may be what we want for in-kernel breakpoints users,
726 * but -EIO looks better for ptrace, since we refuse a register
727 * writing for the user. And anyway this is the previous
735 t->ptrace_bps[nr] = bp;
737 bp = t->ptrace_bps[nr];
741 err = modify_user_hw_breakpoint(bp, &attr);
745 ptrace_put_breakpoints(tsk);
750 * Handle PTRACE_POKEUSR calls for the debug register area.
752 int ptrace_set_debugreg(struct task_struct *tsk, int n, unsigned long val)
754 struct thread_struct *thread = &(tsk->thread);
757 /* There are no DR4 or DR5 registers */
758 if (n == 4 || n == 5)
762 thread->debugreg6 = val;
766 rc = ptrace_set_breakpoint_addr(tsk, n, val);
770 /* All that's left is DR7 */
772 rc = ptrace_write_dr7(tsk, val);
774 thread->ptrace_dr7 = val;
782 * These access the current or another (stopped) task's io permission
783 * bitmap for debugging or core dump.
785 static int ioperm_active(struct task_struct *target,
786 const struct user_regset *regset)
788 return target->thread.io_bitmap_max / regset->size;
791 static int ioperm_get(struct task_struct *target,
792 const struct user_regset *regset,
793 unsigned int pos, unsigned int count,
794 void *kbuf, void __user *ubuf)
796 if (!target->thread.io_bitmap_ptr)
799 return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
800 target->thread.io_bitmap_ptr,
805 * Called by kernel/ptrace.c when detaching..
807 * Make sure the single step bit is not set.
809 void ptrace_disable(struct task_struct *child)
811 user_disable_single_step(child);
812 #ifdef TIF_SYSCALL_EMU
813 clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
817 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
818 static const struct user_regset_view user_x86_32_view; /* Initialized below. */
821 long arch_ptrace(struct task_struct *child, long request,
822 unsigned long addr, unsigned long data)
825 unsigned long __user *datap = (unsigned long __user *)data;
828 /* read the word at location addr in the USER area. */
829 case PTRACE_PEEKUSR: {
833 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
836 tmp = 0; /* Default return condition */
837 if (addr < sizeof(struct user_regs_struct))
838 tmp = getreg(child, addr);
839 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
840 addr <= offsetof(struct user, u_debugreg[7])) {
841 addr -= offsetof(struct user, u_debugreg[0]);
842 tmp = ptrace_get_debugreg(child, addr / sizeof(data));
844 ret = put_user(tmp, datap);
848 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
850 if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user))
853 if (addr < sizeof(struct user_regs_struct))
854 ret = putreg(child, addr, data);
855 else if (addr >= offsetof(struct user, u_debugreg[0]) &&
856 addr <= offsetof(struct user, u_debugreg[7])) {
857 addr -= offsetof(struct user, u_debugreg[0]);
858 ret = ptrace_set_debugreg(child,
859 addr / sizeof(data), data);
863 case PTRACE_GETREGS: /* Get all gp regs from the child. */
864 return copy_regset_to_user(child,
865 task_user_regset_view(current),
867 0, sizeof(struct user_regs_struct),
870 case PTRACE_SETREGS: /* Set all gp regs in the child. */
871 return copy_regset_from_user(child,
872 task_user_regset_view(current),
874 0, sizeof(struct user_regs_struct),
877 case PTRACE_GETFPREGS: /* Get the child FPU state. */
878 return copy_regset_to_user(child,
879 task_user_regset_view(current),
881 0, sizeof(struct user_i387_struct),
884 case PTRACE_SETFPREGS: /* Set the child FPU state. */
885 return copy_regset_from_user(child,
886 task_user_regset_view(current),
888 0, sizeof(struct user_i387_struct),
892 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
893 return copy_regset_to_user(child, &user_x86_32_view,
895 0, sizeof(struct user_fxsr_struct),
898 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
899 return copy_regset_from_user(child, &user_x86_32_view,
901 0, sizeof(struct user_fxsr_struct),
905 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
906 case PTRACE_GET_THREAD_AREA:
909 ret = do_get_thread_area(child, addr,
910 (struct user_desc __user *)data);
913 case PTRACE_SET_THREAD_AREA:
916 ret = do_set_thread_area(child, addr,
917 (struct user_desc __user *)data, 0);
922 /* normal 64bit interface to access TLS data.
923 Works just like arch_prctl, except that the arguments
925 case PTRACE_ARCH_PRCTL:
926 ret = do_arch_prctl(child, data, addr);
931 ret = ptrace_request(child, request, addr, data);
938 #ifdef CONFIG_IA32_EMULATION
940 #include <linux/compat.h>
941 #include <linux/syscalls.h>
942 #include <asm/ia32.h>
943 #include <asm/user32.h>
946 case offsetof(struct user32, regs.l): \
947 regs->q = value; break
950 case offsetof(struct user32, regs.rs): \
951 return set_segment_reg(child, \
952 offsetof(struct user_regs_struct, rs), \
956 static int putreg32(struct task_struct *child, unsigned regno, u32 value)
958 struct pt_regs *regs = task_pt_regs(child);
979 case offsetof(struct user32, regs.orig_eax):
981 * A 32-bit debugger setting orig_eax means to restore
982 * the state of the task restarting a 32-bit syscall.
983 * Make sure we interpret the -ERESTART* codes correctly
984 * in case the task is not actually still sitting at the
985 * exit from a 32-bit syscall with TS_COMPAT still set.
987 regs->orig_ax = value;
988 if (syscall_get_nr(child, regs) >= 0)
989 task_thread_info(child)->status |= TS_COMPAT;
992 case offsetof(struct user32, regs.eflags):
993 return set_flags(child, value);
995 case offsetof(struct user32, u_debugreg[0]) ...
996 offsetof(struct user32, u_debugreg[7]):
997 regno -= offsetof(struct user32, u_debugreg[0]);
998 return ptrace_set_debugreg(child, regno / 4, value);
1001 if (regno > sizeof(struct user32) || (regno & 3))
1005 * Other dummy fields in the virtual user structure
1017 case offsetof(struct user32, regs.l): \
1018 *val = regs->q; break
1021 case offsetof(struct user32, regs.rs): \
1022 *val = get_segment_reg(child, \
1023 offsetof(struct user_regs_struct, rs)); \
1026 static int getreg32(struct task_struct *child, unsigned regno, u32 *val)
1028 struct pt_regs *regs = task_pt_regs(child);
1046 R32(orig_eax, orig_ax);
1050 case offsetof(struct user32, regs.eflags):
1051 *val = get_flags(child);
1054 case offsetof(struct user32, u_debugreg[0]) ...
1055 offsetof(struct user32, u_debugreg[7]):
1056 regno -= offsetof(struct user32, u_debugreg[0]);
1057 *val = ptrace_get_debugreg(child, regno / 4);
1061 if (regno > sizeof(struct user32) || (regno & 3))
1065 * Other dummy fields in the virtual user structure
1077 static int genregs32_get(struct task_struct *target,
1078 const struct user_regset *regset,
1079 unsigned int pos, unsigned int count,
1080 void *kbuf, void __user *ubuf)
1083 compat_ulong_t *k = kbuf;
1084 while (count >= sizeof(*k)) {
1085 getreg32(target, pos, k++);
1086 count -= sizeof(*k);
1090 compat_ulong_t __user *u = ubuf;
1091 while (count >= sizeof(*u)) {
1092 compat_ulong_t word;
1093 getreg32(target, pos, &word);
1094 if (__put_user(word, u++))
1096 count -= sizeof(*u);
1104 static int genregs32_set(struct task_struct *target,
1105 const struct user_regset *regset,
1106 unsigned int pos, unsigned int count,
1107 const void *kbuf, const void __user *ubuf)
1111 const compat_ulong_t *k = kbuf;
1112 while (count >= sizeof(*k) && !ret) {
1113 ret = putreg32(target, pos, *k++);
1114 count -= sizeof(*k);
1118 const compat_ulong_t __user *u = ubuf;
1119 while (count >= sizeof(*u) && !ret) {
1120 compat_ulong_t word;
1121 ret = __get_user(word, u++);
1124 ret = putreg32(target, pos, word);
1125 count -= sizeof(*u);
1132 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
1133 compat_ulong_t caddr, compat_ulong_t cdata)
1135 unsigned long addr = caddr;
1136 unsigned long data = cdata;
1137 void __user *datap = compat_ptr(data);
1142 case PTRACE_PEEKUSR:
1143 ret = getreg32(child, addr, &val);
1145 ret = put_user(val, (__u32 __user *)datap);
1148 case PTRACE_POKEUSR:
1149 ret = putreg32(child, addr, data);
1152 case PTRACE_GETREGS: /* Get all gp regs from the child. */
1153 return copy_regset_to_user(child, &user_x86_32_view,
1155 0, sizeof(struct user_regs_struct32),
1158 case PTRACE_SETREGS: /* Set all gp regs in the child. */
1159 return copy_regset_from_user(child, &user_x86_32_view,
1161 sizeof(struct user_regs_struct32),
1164 case PTRACE_GETFPREGS: /* Get the child FPU state. */
1165 return copy_regset_to_user(child, &user_x86_32_view,
1167 sizeof(struct user_i387_ia32_struct),
1170 case PTRACE_SETFPREGS: /* Set the child FPU state. */
1171 return copy_regset_from_user(
1172 child, &user_x86_32_view, REGSET_FP,
1173 0, sizeof(struct user_i387_ia32_struct), datap);
1175 case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */
1176 return copy_regset_to_user(child, &user_x86_32_view,
1178 sizeof(struct user32_fxsr_struct),
1181 case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */
1182 return copy_regset_from_user(child, &user_x86_32_view,
1184 sizeof(struct user32_fxsr_struct),
1187 case PTRACE_GET_THREAD_AREA:
1188 case PTRACE_SET_THREAD_AREA:
1189 return arch_ptrace(child, request, addr, data);
1192 return compat_ptrace_request(child, request, addr, data);
1198 #endif /* CONFIG_IA32_EMULATION */
1200 #ifdef CONFIG_X86_64
1202 static struct user_regset x86_64_regsets[] __read_mostly = {
1203 [REGSET_GENERAL] = {
1204 .core_note_type = NT_PRSTATUS,
1205 .n = sizeof(struct user_regs_struct) / sizeof(long),
1206 .size = sizeof(long), .align = sizeof(long),
1207 .get = genregs_get, .set = genregs_set
1210 .core_note_type = NT_PRFPREG,
1211 .n = sizeof(struct user_i387_struct) / sizeof(long),
1212 .size = sizeof(long), .align = sizeof(long),
1213 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
1216 .core_note_type = NT_X86_XSTATE,
1217 .size = sizeof(u64), .align = sizeof(u64),
1218 .active = xstateregs_active, .get = xstateregs_get,
1219 .set = xstateregs_set
1221 [REGSET_IOPERM64] = {
1222 .core_note_type = NT_386_IOPERM,
1223 .n = IO_BITMAP_LONGS,
1224 .size = sizeof(long), .align = sizeof(long),
1225 .active = ioperm_active, .get = ioperm_get
1229 static const struct user_regset_view user_x86_64_view = {
1230 .name = "x86_64", .e_machine = EM_X86_64,
1231 .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets)
1234 #else /* CONFIG_X86_32 */
1236 #define user_regs_struct32 user_regs_struct
1237 #define genregs32_get genregs_get
1238 #define genregs32_set genregs_set
1240 #define user_i387_ia32_struct user_i387_struct
1241 #define user32_fxsr_struct user_fxsr_struct
1243 #endif /* CONFIG_X86_64 */
1245 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1246 static struct user_regset x86_32_regsets[] __read_mostly = {
1247 [REGSET_GENERAL] = {
1248 .core_note_type = NT_PRSTATUS,
1249 .n = sizeof(struct user_regs_struct32) / sizeof(u32),
1250 .size = sizeof(u32), .align = sizeof(u32),
1251 .get = genregs32_get, .set = genregs32_set
1254 .core_note_type = NT_PRFPREG,
1255 .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32),
1256 .size = sizeof(u32), .align = sizeof(u32),
1257 .active = fpregs_active, .get = fpregs_get, .set = fpregs_set
1260 .core_note_type = NT_PRXFPREG,
1261 .n = sizeof(struct user32_fxsr_struct) / sizeof(u32),
1262 .size = sizeof(u32), .align = sizeof(u32),
1263 .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set
1266 .core_note_type = NT_X86_XSTATE,
1267 .size = sizeof(u64), .align = sizeof(u64),
1268 .active = xstateregs_active, .get = xstateregs_get,
1269 .set = xstateregs_set
1272 .core_note_type = NT_386_TLS,
1273 .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN,
1274 .size = sizeof(struct user_desc),
1275 .align = sizeof(struct user_desc),
1276 .active = regset_tls_active,
1277 .get = regset_tls_get, .set = regset_tls_set
1279 [REGSET_IOPERM32] = {
1280 .core_note_type = NT_386_IOPERM,
1281 .n = IO_BITMAP_BYTES / sizeof(u32),
1282 .size = sizeof(u32), .align = sizeof(u32),
1283 .active = ioperm_active, .get = ioperm_get
1287 static const struct user_regset_view user_x86_32_view = {
1288 .name = "i386", .e_machine = EM_386,
1289 .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets)
1294 * This represents bytes 464..511 in the memory layout exported through
1295 * the REGSET_XSTATE interface.
1297 u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
1299 void update_regset_xstate_info(unsigned int size, u64 xstate_mask)
1301 #ifdef CONFIG_X86_64
1302 x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1304 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1305 x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64);
1307 xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask;
1310 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
1312 #ifdef CONFIG_IA32_EMULATION
1313 if (test_tsk_thread_flag(task, TIF_IA32))
1315 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1316 return &user_x86_32_view;
1318 #ifdef CONFIG_X86_64
1319 return &user_x86_64_view;
1323 static void fill_sigtrap_info(struct task_struct *tsk,
1324 struct pt_regs *regs,
1325 int error_code, int si_code,
1326 struct siginfo *info)
1328 tsk->thread.trap_no = 1;
1329 tsk->thread.error_code = error_code;
1331 memset(info, 0, sizeof(*info));
1332 info->si_signo = SIGTRAP;
1333 info->si_code = si_code;
1334 info->si_addr = user_mode_vm(regs) ? (void __user *)regs->ip : NULL;
1337 void user_single_step_siginfo(struct task_struct *tsk,
1338 struct pt_regs *regs,
1339 struct siginfo *info)
1341 fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info);
1344 void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
1345 int error_code, int si_code)
1347 struct siginfo info;
1349 fill_sigtrap_info(tsk, regs, error_code, si_code, &info);
1350 /* Send us the fake SIGTRAP */
1351 force_sig_info(SIGTRAP, &info, tsk);
1355 #ifdef CONFIG_X86_32
1357 #elif defined CONFIG_IA32_EMULATION
1358 # define IS_IA32 is_compat_task()
1364 * We must return the syscall number to actually look up in the table.
1365 * This can be -1L to skip running any syscall at all.
1367 long syscall_trace_enter(struct pt_regs *regs)
1372 * If we stepped into a sysenter/syscall insn, it trapped in
1373 * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP.
1374 * If user-mode had set TF itself, then it's still clear from
1375 * do_debug() and we need to set it again to restore the user
1376 * state. If we entered on the slow path, TF was already set.
1378 if (test_thread_flag(TIF_SINGLESTEP))
1379 regs->flags |= X86_EFLAGS_TF;
1381 /* do the secure computing check first */
1382 secure_computing(regs->orig_ax);
1384 if (unlikely(test_thread_flag(TIF_SYSCALL_EMU)))
1387 if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) &&
1388 tracehook_report_syscall_entry(regs))
1391 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1392 trace_sys_enter(regs, regs->orig_ax);
1394 if (unlikely(current->audit_context)) {
1396 audit_syscall_entry(AUDIT_ARCH_I386,
1399 regs->dx, regs->si);
1400 #ifdef CONFIG_X86_64
1402 audit_syscall_entry(AUDIT_ARCH_X86_64,
1405 regs->dx, regs->r10);
1409 return ret ?: regs->orig_ax;
1412 void syscall_trace_leave(struct pt_regs *regs)
1416 if (unlikely(current->audit_context))
1417 audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax);
1419 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
1420 trace_sys_exit(regs, regs->ax);
1423 * If TIF_SYSCALL_EMU is set, we only get here because of
1424 * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP).
1425 * We already reported this syscall instruction in
1426 * syscall_trace_enter().
1428 step = unlikely(test_thread_flag(TIF_SINGLESTEP)) &&
1429 !test_thread_flag(TIF_SYSCALL_EMU);
1430 if (step || test_thread_flag(TIF_SYSCALL_TRACE))
1431 tracehook_report_syscall_exit(regs, step);