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>
24 #include <linux/rcupdate.h>
25 #include <linux/module.h>
27 #include <asm/uaccess.h>
28 #include <asm/pgtable.h>
29 #include <asm/processor.h>
31 #include <asm/fpu-internal.h>
32 #include <asm/debugreg.h>
35 #include <asm/prctl.h>
36 #include <asm/proto.h>
37 #include <asm/hw_breakpoint.h>
38 #include <asm/traps.h>
42 #define CREATE_TRACE_POINTS
43 #include <trace/events/syscalls.h>
49 REGSET_IOPERM64
= REGSET_XFP
,
55 struct pt_regs_offset
{
60 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
61 #define REG_OFFSET_END {.name = NULL, .offset = 0}
63 static const struct pt_regs_offset regoffset_table
[] = {
87 REG_OFFSET_NAME(orig_ax
),
90 REG_OFFSET_NAME(flags
),
97 * regs_query_register_offset() - query register offset from its name
98 * @name: the name of a register
100 * regs_query_register_offset() returns the offset of a register in struct
101 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
103 int regs_query_register_offset(const char *name
)
105 const struct pt_regs_offset
*roff
;
106 for (roff
= regoffset_table
; roff
->name
!= NULL
; roff
++)
107 if (!strcmp(roff
->name
, name
))
113 * regs_query_register_name() - query register name from its offset
114 * @offset: the offset of a register in struct pt_regs.
116 * regs_query_register_name() returns the name of a register from its
117 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
119 const char *regs_query_register_name(unsigned int offset
)
121 const struct pt_regs_offset
*roff
;
122 for (roff
= regoffset_table
; roff
->name
!= NULL
; roff
++)
123 if (roff
->offset
== offset
)
128 static const int arg_offs_table
[] = {
130 [0] = offsetof(struct pt_regs
, ax
),
131 [1] = offsetof(struct pt_regs
, dx
),
132 [2] = offsetof(struct pt_regs
, cx
)
133 #else /* CONFIG_X86_64 */
134 [0] = offsetof(struct pt_regs
, di
),
135 [1] = offsetof(struct pt_regs
, si
),
136 [2] = offsetof(struct pt_regs
, dx
),
137 [3] = offsetof(struct pt_regs
, cx
),
138 [4] = offsetof(struct pt_regs
, r8
),
139 [5] = offsetof(struct pt_regs
, r9
)
144 * does not yet catch signals sent when the child dies.
145 * in exit.c or in signal.c.
149 * Determines which flags the user has access to [1 = access, 0 = no access].
151 #define FLAG_MASK_32 ((unsigned long) \
152 (X86_EFLAGS_CF | X86_EFLAGS_PF | \
153 X86_EFLAGS_AF | X86_EFLAGS_ZF | \
154 X86_EFLAGS_SF | X86_EFLAGS_TF | \
155 X86_EFLAGS_DF | X86_EFLAGS_OF | \
156 X86_EFLAGS_RF | X86_EFLAGS_AC))
159 * Determines whether a value may be installed in a segment register.
161 static inline bool invalid_selector(u16 value
)
163 return unlikely(value
!= 0 && (value
& SEGMENT_RPL_MASK
) != USER_RPL
);
168 #define FLAG_MASK FLAG_MASK_32
171 * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
172 * when it traps. The previous stack will be directly underneath the saved
173 * registers, and 'sp/ss' won't even have been saved. Thus the '®s->sp'.
175 * Now, if the stack is empty, '®s->sp' is out of range. In this
176 * case we try to take the previous stack. To always return a non-null
177 * stack pointer we fall back to regs as stack if no previous stack
180 * This is valid only for kernel mode traps.
182 unsigned long kernel_stack_pointer(struct pt_regs
*regs
)
184 unsigned long context
= (unsigned long)regs
& ~(THREAD_SIZE
- 1);
185 unsigned long sp
= (unsigned long)®s
->sp
;
186 struct thread_info
*tinfo
;
188 if (context
== (sp
& ~(THREAD_SIZE
- 1)))
191 tinfo
= (struct thread_info
*)context
;
192 if (tinfo
->previous_esp
)
193 return tinfo
->previous_esp
;
195 return (unsigned long)regs
;
197 EXPORT_SYMBOL_GPL(kernel_stack_pointer
);
199 static unsigned long *pt_regs_access(struct pt_regs
*regs
, unsigned long regno
)
201 BUILD_BUG_ON(offsetof(struct pt_regs
, bx
) != 0);
202 return ®s
->bx
+ (regno
>> 2);
205 static u16
get_segment_reg(struct task_struct
*task
, unsigned long offset
)
208 * Returning the value truncates it to 16 bits.
211 if (offset
!= offsetof(struct user_regs_struct
, gs
))
212 retval
= *pt_regs_access(task_pt_regs(task
), offset
);
215 retval
= get_user_gs(task_pt_regs(task
));
217 retval
= task_user_gs(task
);
222 static int set_segment_reg(struct task_struct
*task
,
223 unsigned long offset
, u16 value
)
226 * The value argument was already truncated to 16 bits.
228 if (invalid_selector(value
))
232 * For %cs and %ss we cannot permit a null selector.
233 * We can permit a bogus selector as long as it has USER_RPL.
234 * Null selectors are fine for other segment registers, but
235 * we will never get back to user mode with invalid %cs or %ss
236 * and will take the trap in iret instead. Much code relies
237 * on user_mode() to distinguish a user trap frame (which can
238 * safely use invalid selectors) from a kernel trap frame.
241 case offsetof(struct user_regs_struct
, cs
):
242 case offsetof(struct user_regs_struct
, ss
):
243 if (unlikely(value
== 0))
247 *pt_regs_access(task_pt_regs(task
), offset
) = value
;
250 case offsetof(struct user_regs_struct
, gs
):
252 set_user_gs(task_pt_regs(task
), value
);
254 task_user_gs(task
) = value
;
260 #else /* CONFIG_X86_64 */
262 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
264 static unsigned long *pt_regs_access(struct pt_regs
*regs
, unsigned long offset
)
266 BUILD_BUG_ON(offsetof(struct pt_regs
, r15
) != 0);
267 return ®s
->r15
+ (offset
/ sizeof(regs
->r15
));
270 static u16
get_segment_reg(struct task_struct
*task
, unsigned long offset
)
273 * Returning the value truncates it to 16 bits.
278 case offsetof(struct user_regs_struct
, fs
):
279 if (task
== current
) {
280 /* Older gas can't assemble movq %?s,%r?? */
281 asm("movl %%fs,%0" : "=r" (seg
));
284 return task
->thread
.fsindex
;
285 case offsetof(struct user_regs_struct
, gs
):
286 if (task
== current
) {
287 asm("movl %%gs,%0" : "=r" (seg
));
290 return task
->thread
.gsindex
;
291 case offsetof(struct user_regs_struct
, ds
):
292 if (task
== current
) {
293 asm("movl %%ds,%0" : "=r" (seg
));
296 return task
->thread
.ds
;
297 case offsetof(struct user_regs_struct
, es
):
298 if (task
== current
) {
299 asm("movl %%es,%0" : "=r" (seg
));
302 return task
->thread
.es
;
304 case offsetof(struct user_regs_struct
, cs
):
305 case offsetof(struct user_regs_struct
, ss
):
308 return *pt_regs_access(task_pt_regs(task
), offset
);
311 static int set_segment_reg(struct task_struct
*task
,
312 unsigned long offset
, u16 value
)
315 * The value argument was already truncated to 16 bits.
317 if (invalid_selector(value
))
321 case offsetof(struct user_regs_struct
,fs
):
323 * If this is setting fs as for normal 64-bit use but
324 * setting fs_base has implicitly changed it, leave it.
326 if ((value
== FS_TLS_SEL
&& task
->thread
.fsindex
== 0 &&
327 task
->thread
.fs
!= 0) ||
328 (value
== 0 && task
->thread
.fsindex
== FS_TLS_SEL
&&
329 task
->thread
.fs
== 0))
331 task
->thread
.fsindex
= value
;
333 loadsegment(fs
, task
->thread
.fsindex
);
335 case offsetof(struct user_regs_struct
,gs
):
337 * If this is setting gs as for normal 64-bit use but
338 * setting gs_base has implicitly changed it, leave it.
340 if ((value
== GS_TLS_SEL
&& task
->thread
.gsindex
== 0 &&
341 task
->thread
.gs
!= 0) ||
342 (value
== 0 && task
->thread
.gsindex
== GS_TLS_SEL
&&
343 task
->thread
.gs
== 0))
345 task
->thread
.gsindex
= value
;
347 load_gs_index(task
->thread
.gsindex
);
349 case offsetof(struct user_regs_struct
,ds
):
350 task
->thread
.ds
= value
;
352 loadsegment(ds
, task
->thread
.ds
);
354 case offsetof(struct user_regs_struct
,es
):
355 task
->thread
.es
= value
;
357 loadsegment(es
, task
->thread
.es
);
361 * Can't actually change these in 64-bit mode.
363 case offsetof(struct user_regs_struct
,cs
):
364 if (unlikely(value
== 0))
366 #ifdef CONFIG_IA32_EMULATION
367 if (test_tsk_thread_flag(task
, TIF_IA32
))
368 task_pt_regs(task
)->cs
= value
;
371 case offsetof(struct user_regs_struct
,ss
):
372 if (unlikely(value
== 0))
374 #ifdef CONFIG_IA32_EMULATION
375 if (test_tsk_thread_flag(task
, TIF_IA32
))
376 task_pt_regs(task
)->ss
= value
;
384 #endif /* CONFIG_X86_32 */
386 static unsigned long get_flags(struct task_struct
*task
)
388 unsigned long retval
= task_pt_regs(task
)->flags
;
391 * If the debugger set TF, hide it from the readout.
393 if (test_tsk_thread_flag(task
, TIF_FORCED_TF
))
394 retval
&= ~X86_EFLAGS_TF
;
399 static int set_flags(struct task_struct
*task
, unsigned long value
)
401 struct pt_regs
*regs
= task_pt_regs(task
);
404 * If the user value contains TF, mark that
405 * it was not "us" (the debugger) that set it.
406 * If not, make sure it stays set if we had.
408 if (value
& X86_EFLAGS_TF
)
409 clear_tsk_thread_flag(task
, TIF_FORCED_TF
);
410 else if (test_tsk_thread_flag(task
, TIF_FORCED_TF
))
411 value
|= X86_EFLAGS_TF
;
413 regs
->flags
= (regs
->flags
& ~FLAG_MASK
) | (value
& FLAG_MASK
);
418 static int putreg(struct task_struct
*child
,
419 unsigned long offset
, unsigned long value
)
422 case offsetof(struct user_regs_struct
, cs
):
423 case offsetof(struct user_regs_struct
, ds
):
424 case offsetof(struct user_regs_struct
, es
):
425 case offsetof(struct user_regs_struct
, fs
):
426 case offsetof(struct user_regs_struct
, gs
):
427 case offsetof(struct user_regs_struct
, ss
):
428 return set_segment_reg(child
, offset
, value
);
430 case offsetof(struct user_regs_struct
, flags
):
431 return set_flags(child
, value
);
434 case offsetof(struct user_regs_struct
,fs_base
):
435 if (value
>= TASK_SIZE_OF(child
))
438 * When changing the segment base, use do_arch_prctl
439 * to set either thread.fs or thread.fsindex and the
440 * corresponding GDT slot.
442 if (child
->thread
.fs
!= value
)
443 return do_arch_prctl(child
, ARCH_SET_FS
, value
);
445 case offsetof(struct user_regs_struct
,gs_base
):
447 * Exactly the same here as the %fs handling above.
449 if (value
>= TASK_SIZE_OF(child
))
451 if (child
->thread
.gs
!= value
)
452 return do_arch_prctl(child
, ARCH_SET_GS
, value
);
457 *pt_regs_access(task_pt_regs(child
), offset
) = value
;
461 static unsigned long getreg(struct task_struct
*task
, unsigned long offset
)
464 case offsetof(struct user_regs_struct
, cs
):
465 case offsetof(struct user_regs_struct
, ds
):
466 case offsetof(struct user_regs_struct
, es
):
467 case offsetof(struct user_regs_struct
, fs
):
468 case offsetof(struct user_regs_struct
, gs
):
469 case offsetof(struct user_regs_struct
, ss
):
470 return get_segment_reg(task
, offset
);
472 case offsetof(struct user_regs_struct
, flags
):
473 return get_flags(task
);
476 case offsetof(struct user_regs_struct
, fs_base
): {
478 * do_arch_prctl may have used a GDT slot instead of
479 * the MSR. To userland, it appears the same either
480 * way, except the %fs segment selector might not be 0.
482 unsigned int seg
= task
->thread
.fsindex
;
483 if (task
->thread
.fs
!= 0)
484 return task
->thread
.fs
;
486 asm("movl %%fs,%0" : "=r" (seg
));
487 if (seg
!= FS_TLS_SEL
)
489 return get_desc_base(&task
->thread
.tls_array
[FS_TLS
]);
491 case offsetof(struct user_regs_struct
, gs_base
): {
493 * Exactly the same here as the %fs handling above.
495 unsigned int seg
= task
->thread
.gsindex
;
496 if (task
->thread
.gs
!= 0)
497 return task
->thread
.gs
;
499 asm("movl %%gs,%0" : "=r" (seg
));
500 if (seg
!= GS_TLS_SEL
)
502 return get_desc_base(&task
->thread
.tls_array
[GS_TLS
]);
507 return *pt_regs_access(task_pt_regs(task
), offset
);
510 static int genregs_get(struct task_struct
*target
,
511 const struct user_regset
*regset
,
512 unsigned int pos
, unsigned int count
,
513 void *kbuf
, void __user
*ubuf
)
516 unsigned long *k
= kbuf
;
517 while (count
>= sizeof(*k
)) {
518 *k
++ = getreg(target
, pos
);
523 unsigned long __user
*u
= ubuf
;
524 while (count
>= sizeof(*u
)) {
525 if (__put_user(getreg(target
, pos
), u
++))
535 static int genregs_set(struct task_struct
*target
,
536 const struct user_regset
*regset
,
537 unsigned int pos
, unsigned int count
,
538 const void *kbuf
, const void __user
*ubuf
)
542 const unsigned long *k
= kbuf
;
543 while (count
>= sizeof(*k
) && !ret
) {
544 ret
= putreg(target
, pos
, *k
++);
549 const unsigned long __user
*u
= ubuf
;
550 while (count
>= sizeof(*u
) && !ret
) {
552 ret
= __get_user(word
, u
++);
555 ret
= putreg(target
, pos
, word
);
563 static void ptrace_triggered(struct perf_event
*bp
,
564 struct perf_sample_data
*data
,
565 struct pt_regs
*regs
)
568 struct thread_struct
*thread
= &(current
->thread
);
571 * Store in the virtual DR6 register the fact that the breakpoint
572 * was hit so the thread's debugger will see it.
574 for (i
= 0; i
< HBP_NUM
; i
++) {
575 if (thread
->ptrace_bps
[i
] == bp
)
579 thread
->debugreg6
|= (DR_TRAP0
<< i
);
583 * Walk through every ptrace breakpoints for this thread and
584 * build the dr7 value on top of their attributes.
587 static unsigned long ptrace_get_dr7(struct perf_event
*bp
[])
591 struct arch_hw_breakpoint
*info
;
593 for (i
= 0; i
< HBP_NUM
; i
++) {
594 if (bp
[i
] && !bp
[i
]->attr
.disabled
) {
595 info
= counter_arch_bp(bp
[i
]);
596 dr7
|= encode_dr7(i
, info
->len
, info
->type
);
604 ptrace_modify_breakpoint(struct perf_event
*bp
, int len
, int type
,
605 struct task_struct
*tsk
, int disabled
)
608 int gen_len
, gen_type
;
609 struct perf_event_attr attr
;
612 * We should have at least an inactive breakpoint at this
613 * slot. It means the user is writing dr7 without having
614 * written the address register first
619 err
= arch_bp_generic_fields(len
, type
, &gen_len
, &gen_type
);
624 attr
.bp_len
= gen_len
;
625 attr
.bp_type
= gen_type
;
626 attr
.disabled
= disabled
;
628 return modify_user_hw_breakpoint(bp
, &attr
);
632 * Handle ptrace writes to debug register 7.
634 static int ptrace_write_dr7(struct task_struct
*tsk
, unsigned long data
)
636 struct thread_struct
*thread
= &(tsk
->thread
);
637 unsigned long old_dr7
;
638 int i
, orig_ret
= 0, rc
= 0;
639 int enabled
, second_pass
= 0;
641 struct perf_event
*bp
;
643 if (ptrace_get_breakpoints(tsk
) < 0)
646 data
&= ~DR_CONTROL_RESERVED
;
647 old_dr7
= ptrace_get_dr7(thread
->ptrace_bps
);
650 * Loop through all the hardware breakpoints, making the
651 * appropriate changes to each.
653 for (i
= 0; i
< HBP_NUM
; i
++) {
654 enabled
= decode_dr7(data
, i
, &len
, &type
);
655 bp
= thread
->ptrace_bps
[i
];
660 * Don't unregister the breakpoints right-away,
661 * unless all register_user_hw_breakpoint()
662 * requests have succeeded. This prevents
663 * any window of opportunity for debug
664 * register grabbing by other users.
669 rc
= ptrace_modify_breakpoint(bp
, len
, type
,
677 rc
= ptrace_modify_breakpoint(bp
, len
, type
, tsk
, 0);
682 * Make a second pass to free the remaining unused breakpoints
683 * or to restore the original breakpoints if an error occurred.
694 ptrace_put_breakpoints(tsk
);
696 return ((orig_ret
< 0) ? orig_ret
: rc
);
700 * Handle PTRACE_PEEKUSR calls for the debug register area.
702 static unsigned long ptrace_get_debugreg(struct task_struct
*tsk
, int n
)
704 struct thread_struct
*thread
= &(tsk
->thread
);
705 unsigned long val
= 0;
708 struct perf_event
*bp
;
710 if (ptrace_get_breakpoints(tsk
) < 0)
713 bp
= thread
->ptrace_bps
[n
];
717 val
= bp
->hw
.info
.address
;
719 ptrace_put_breakpoints(tsk
);
721 val
= thread
->debugreg6
;
723 val
= thread
->ptrace_dr7
;
728 static int ptrace_set_breakpoint_addr(struct task_struct
*tsk
, int nr
,
731 struct perf_event
*bp
;
732 struct thread_struct
*t
= &tsk
->thread
;
733 struct perf_event_attr attr
;
736 if (ptrace_get_breakpoints(tsk
) < 0)
739 if (!t
->ptrace_bps
[nr
]) {
740 ptrace_breakpoint_init(&attr
);
742 * Put stub len and type to register (reserve) an inactive but
746 attr
.bp_len
= HW_BREAKPOINT_LEN_1
;
747 attr
.bp_type
= HW_BREAKPOINT_W
;
750 bp
= register_user_hw_breakpoint(&attr
, ptrace_triggered
,
754 * CHECKME: the previous code returned -EIO if the addr wasn't
755 * a valid task virtual addr. The new one will return -EINVAL in
757 * -EINVAL may be what we want for in-kernel breakpoints users,
758 * but -EIO looks better for ptrace, since we refuse a register
759 * writing for the user. And anyway this is the previous
767 t
->ptrace_bps
[nr
] = bp
;
769 bp
= t
->ptrace_bps
[nr
];
773 err
= modify_user_hw_breakpoint(bp
, &attr
);
777 ptrace_put_breakpoints(tsk
);
782 * Handle PTRACE_POKEUSR calls for the debug register area.
784 static int ptrace_set_debugreg(struct task_struct
*tsk
, int n
,
787 struct thread_struct
*thread
= &(tsk
->thread
);
790 /* There are no DR4 or DR5 registers */
791 if (n
== 4 || n
== 5)
795 thread
->debugreg6
= val
;
799 rc
= ptrace_set_breakpoint_addr(tsk
, n
, val
);
803 /* All that's left is DR7 */
805 rc
= ptrace_write_dr7(tsk
, val
);
807 thread
->ptrace_dr7
= val
;
815 * These access the current or another (stopped) task's io permission
816 * bitmap for debugging or core dump.
818 static int ioperm_active(struct task_struct
*target
,
819 const struct user_regset
*regset
)
821 return target
->thread
.io_bitmap_max
/ regset
->size
;
824 static int ioperm_get(struct task_struct
*target
,
825 const struct user_regset
*regset
,
826 unsigned int pos
, unsigned int count
,
827 void *kbuf
, void __user
*ubuf
)
829 if (!target
->thread
.io_bitmap_ptr
)
832 return user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
,
833 target
->thread
.io_bitmap_ptr
,
838 * Called by kernel/ptrace.c when detaching..
840 * Make sure the single step bit is not set.
842 void ptrace_disable(struct task_struct
*child
)
844 user_disable_single_step(child
);
845 #ifdef TIF_SYSCALL_EMU
846 clear_tsk_thread_flag(child
, TIF_SYSCALL_EMU
);
850 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
851 static const struct user_regset_view user_x86_32_view
; /* Initialized below. */
854 long arch_ptrace(struct task_struct
*child
, long request
,
855 unsigned long addr
, unsigned long data
)
858 unsigned long __user
*datap
= (unsigned long __user
*)data
;
861 /* read the word at location addr in the USER area. */
862 case PTRACE_PEEKUSR
: {
866 if ((addr
& (sizeof(data
) - 1)) || addr
>= sizeof(struct user
))
869 tmp
= 0; /* Default return condition */
870 if (addr
< sizeof(struct user_regs_struct
))
871 tmp
= getreg(child
, addr
);
872 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
873 addr
<= offsetof(struct user
, u_debugreg
[7])) {
874 addr
-= offsetof(struct user
, u_debugreg
[0]);
875 tmp
= ptrace_get_debugreg(child
, addr
/ sizeof(data
));
877 ret
= put_user(tmp
, datap
);
881 case PTRACE_POKEUSR
: /* write the word at location addr in the USER area */
883 if ((addr
& (sizeof(data
) - 1)) || addr
>= sizeof(struct user
))
886 if (addr
< sizeof(struct user_regs_struct
))
887 ret
= putreg(child
, addr
, data
);
888 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
889 addr
<= offsetof(struct user
, u_debugreg
[7])) {
890 addr
-= offsetof(struct user
, u_debugreg
[0]);
891 ret
= ptrace_set_debugreg(child
,
892 addr
/ sizeof(data
), data
);
896 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
897 return copy_regset_to_user(child
,
898 task_user_regset_view(current
),
900 0, sizeof(struct user_regs_struct
),
903 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
904 return copy_regset_from_user(child
,
905 task_user_regset_view(current
),
907 0, sizeof(struct user_regs_struct
),
910 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
911 return copy_regset_to_user(child
,
912 task_user_regset_view(current
),
914 0, sizeof(struct user_i387_struct
),
917 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
918 return copy_regset_from_user(child
,
919 task_user_regset_view(current
),
921 0, sizeof(struct user_i387_struct
),
925 case PTRACE_GETFPXREGS
: /* Get the child extended FPU state. */
926 return copy_regset_to_user(child
, &user_x86_32_view
,
928 0, sizeof(struct user_fxsr_struct
),
931 case PTRACE_SETFPXREGS
: /* Set the child extended FPU state. */
932 return copy_regset_from_user(child
, &user_x86_32_view
,
934 0, sizeof(struct user_fxsr_struct
),
938 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
939 case PTRACE_GET_THREAD_AREA
:
942 ret
= do_get_thread_area(child
, addr
,
943 (struct user_desc __user
*)data
);
946 case PTRACE_SET_THREAD_AREA
:
949 ret
= do_set_thread_area(child
, addr
,
950 (struct user_desc __user
*)data
, 0);
955 /* normal 64bit interface to access TLS data.
956 Works just like arch_prctl, except that the arguments
958 case PTRACE_ARCH_PRCTL
:
959 ret
= do_arch_prctl(child
, data
, addr
);
964 ret
= ptrace_request(child
, request
, addr
, data
);
971 #ifdef CONFIG_IA32_EMULATION
973 #include <linux/compat.h>
974 #include <linux/syscalls.h>
975 #include <asm/ia32.h>
976 #include <asm/user32.h>
979 case offsetof(struct user32, regs.l): \
980 regs->q = value; break
983 case offsetof(struct user32, regs.rs): \
984 return set_segment_reg(child, \
985 offsetof(struct user_regs_struct, rs), \
989 static int putreg32(struct task_struct
*child
, unsigned regno
, u32 value
)
991 struct pt_regs
*regs
= task_pt_regs(child
);
1012 case offsetof(struct user32
, regs
.orig_eax
):
1014 * A 32-bit debugger setting orig_eax means to restore
1015 * the state of the task restarting a 32-bit syscall.
1016 * Make sure we interpret the -ERESTART* codes correctly
1017 * in case the task is not actually still sitting at the
1018 * exit from a 32-bit syscall with TS_COMPAT still set.
1020 regs
->orig_ax
= value
;
1021 if (syscall_get_nr(child
, regs
) >= 0)
1022 task_thread_info(child
)->status
|= TS_COMPAT
;
1025 case offsetof(struct user32
, regs
.eflags
):
1026 return set_flags(child
, value
);
1028 case offsetof(struct user32
, u_debugreg
[0]) ...
1029 offsetof(struct user32
, u_debugreg
[7]):
1030 regno
-= offsetof(struct user32
, u_debugreg
[0]);
1031 return ptrace_set_debugreg(child
, regno
/ 4, value
);
1034 if (regno
> sizeof(struct user32
) || (regno
& 3))
1038 * Other dummy fields in the virtual user structure
1050 case offsetof(struct user32, regs.l): \
1051 *val = regs->q; break
1054 case offsetof(struct user32, regs.rs): \
1055 *val = get_segment_reg(child, \
1056 offsetof(struct user_regs_struct, rs)); \
1059 static int getreg32(struct task_struct
*child
, unsigned regno
, u32
*val
)
1061 struct pt_regs
*regs
= task_pt_regs(child
);
1079 R32(orig_eax
, orig_ax
);
1083 case offsetof(struct user32
, regs
.eflags
):
1084 *val
= get_flags(child
);
1087 case offsetof(struct user32
, u_debugreg
[0]) ...
1088 offsetof(struct user32
, u_debugreg
[7]):
1089 regno
-= offsetof(struct user32
, u_debugreg
[0]);
1090 *val
= ptrace_get_debugreg(child
, regno
/ 4);
1094 if (regno
> sizeof(struct user32
) || (regno
& 3))
1098 * Other dummy fields in the virtual user structure
1110 static int genregs32_get(struct task_struct
*target
,
1111 const struct user_regset
*regset
,
1112 unsigned int pos
, unsigned int count
,
1113 void *kbuf
, void __user
*ubuf
)
1116 compat_ulong_t
*k
= kbuf
;
1117 while (count
>= sizeof(*k
)) {
1118 getreg32(target
, pos
, k
++);
1119 count
-= sizeof(*k
);
1123 compat_ulong_t __user
*u
= ubuf
;
1124 while (count
>= sizeof(*u
)) {
1125 compat_ulong_t word
;
1126 getreg32(target
, pos
, &word
);
1127 if (__put_user(word
, u
++))
1129 count
-= sizeof(*u
);
1137 static int genregs32_set(struct task_struct
*target
,
1138 const struct user_regset
*regset
,
1139 unsigned int pos
, unsigned int count
,
1140 const void *kbuf
, const void __user
*ubuf
)
1144 const compat_ulong_t
*k
= kbuf
;
1145 while (count
>= sizeof(*k
) && !ret
) {
1146 ret
= putreg32(target
, pos
, *k
++);
1147 count
-= sizeof(*k
);
1151 const compat_ulong_t __user
*u
= ubuf
;
1152 while (count
>= sizeof(*u
) && !ret
) {
1153 compat_ulong_t word
;
1154 ret
= __get_user(word
, u
++);
1157 ret
= putreg32(target
, pos
, word
);
1158 count
-= sizeof(*u
);
1165 #ifdef CONFIG_X86_X32_ABI
1166 static long x32_arch_ptrace(struct task_struct
*child
,
1167 compat_long_t request
, compat_ulong_t caddr
,
1168 compat_ulong_t cdata
)
1170 unsigned long addr
= caddr
;
1171 unsigned long data
= cdata
;
1172 void __user
*datap
= compat_ptr(data
);
1176 /* Read 32bits at location addr in the USER area. Only allow
1177 to return the lower 32bits of segment and debug registers. */
1178 case PTRACE_PEEKUSR
: {
1182 if ((addr
& (sizeof(data
) - 1)) || addr
>= sizeof(struct user
) ||
1183 addr
< offsetof(struct user_regs_struct
, cs
))
1186 tmp
= 0; /* Default return condition */
1187 if (addr
< sizeof(struct user_regs_struct
))
1188 tmp
= getreg(child
, addr
);
1189 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
1190 addr
<= offsetof(struct user
, u_debugreg
[7])) {
1191 addr
-= offsetof(struct user
, u_debugreg
[0]);
1192 tmp
= ptrace_get_debugreg(child
, addr
/ sizeof(data
));
1194 ret
= put_user(tmp
, (__u32 __user
*)datap
);
1198 /* Write the word at location addr in the USER area. Only allow
1199 to update segment and debug registers with the upper 32bits
1201 case PTRACE_POKEUSR
:
1203 if ((addr
& (sizeof(data
) - 1)) || addr
>= sizeof(struct user
) ||
1204 addr
< offsetof(struct user_regs_struct
, cs
))
1207 if (addr
< sizeof(struct user_regs_struct
))
1208 ret
= putreg(child
, addr
, data
);
1209 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
1210 addr
<= offsetof(struct user
, u_debugreg
[7])) {
1211 addr
-= offsetof(struct user
, u_debugreg
[0]);
1212 ret
= ptrace_set_debugreg(child
,
1213 addr
/ sizeof(data
), data
);
1217 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
1218 return copy_regset_to_user(child
,
1219 task_user_regset_view(current
),
1221 0, sizeof(struct user_regs_struct
),
1224 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
1225 return copy_regset_from_user(child
,
1226 task_user_regset_view(current
),
1228 0, sizeof(struct user_regs_struct
),
1231 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
1232 return copy_regset_to_user(child
,
1233 task_user_regset_view(current
),
1235 0, sizeof(struct user_i387_struct
),
1238 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
1239 return copy_regset_from_user(child
,
1240 task_user_regset_view(current
),
1242 0, sizeof(struct user_i387_struct
),
1246 return compat_ptrace_request(child
, request
, addr
, data
);
1253 long compat_arch_ptrace(struct task_struct
*child
, compat_long_t request
,
1254 compat_ulong_t caddr
, compat_ulong_t cdata
)
1256 unsigned long addr
= caddr
;
1257 unsigned long data
= cdata
;
1258 void __user
*datap
= compat_ptr(data
);
1262 #ifdef CONFIG_X86_X32_ABI
1263 if (!is_ia32_task())
1264 return x32_arch_ptrace(child
, request
, caddr
, cdata
);
1268 case PTRACE_PEEKUSR
:
1269 ret
= getreg32(child
, addr
, &val
);
1271 ret
= put_user(val
, (__u32 __user
*)datap
);
1274 case PTRACE_POKEUSR
:
1275 ret
= putreg32(child
, addr
, data
);
1278 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
1279 return copy_regset_to_user(child
, &user_x86_32_view
,
1281 0, sizeof(struct user_regs_struct32
),
1284 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
1285 return copy_regset_from_user(child
, &user_x86_32_view
,
1287 sizeof(struct user_regs_struct32
),
1290 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
1291 return copy_regset_to_user(child
, &user_x86_32_view
,
1293 sizeof(struct user_i387_ia32_struct
),
1296 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
1297 return copy_regset_from_user(
1298 child
, &user_x86_32_view
, REGSET_FP
,
1299 0, sizeof(struct user_i387_ia32_struct
), datap
);
1301 case PTRACE_GETFPXREGS
: /* Get the child extended FPU state. */
1302 return copy_regset_to_user(child
, &user_x86_32_view
,
1304 sizeof(struct user32_fxsr_struct
),
1307 case PTRACE_SETFPXREGS
: /* Set the child extended FPU state. */
1308 return copy_regset_from_user(child
, &user_x86_32_view
,
1310 sizeof(struct user32_fxsr_struct
),
1313 case PTRACE_GET_THREAD_AREA
:
1314 case PTRACE_SET_THREAD_AREA
:
1315 return arch_ptrace(child
, request
, addr
, data
);
1318 return compat_ptrace_request(child
, request
, addr
, data
);
1324 #endif /* CONFIG_IA32_EMULATION */
1326 #ifdef CONFIG_X86_64
1328 static struct user_regset x86_64_regsets
[] __read_mostly
= {
1329 [REGSET_GENERAL
] = {
1330 .core_note_type
= NT_PRSTATUS
,
1331 .n
= sizeof(struct user_regs_struct
) / sizeof(long),
1332 .size
= sizeof(long), .align
= sizeof(long),
1333 .get
= genregs_get
, .set
= genregs_set
1336 .core_note_type
= NT_PRFPREG
,
1337 .n
= sizeof(struct user_i387_struct
) / sizeof(long),
1338 .size
= sizeof(long), .align
= sizeof(long),
1339 .active
= xfpregs_active
, .get
= xfpregs_get
, .set
= xfpregs_set
1342 .core_note_type
= NT_X86_XSTATE
,
1343 .size
= sizeof(u64
), .align
= sizeof(u64
),
1344 .active
= xstateregs_active
, .get
= xstateregs_get
,
1345 .set
= xstateregs_set
1347 [REGSET_IOPERM64
] = {
1348 .core_note_type
= NT_386_IOPERM
,
1349 .n
= IO_BITMAP_LONGS
,
1350 .size
= sizeof(long), .align
= sizeof(long),
1351 .active
= ioperm_active
, .get
= ioperm_get
1355 static const struct user_regset_view user_x86_64_view
= {
1356 .name
= "x86_64", .e_machine
= EM_X86_64
,
1357 .regsets
= x86_64_regsets
, .n
= ARRAY_SIZE(x86_64_regsets
)
1360 #else /* CONFIG_X86_32 */
1362 #define user_regs_struct32 user_regs_struct
1363 #define genregs32_get genregs_get
1364 #define genregs32_set genregs_set
1366 #endif /* CONFIG_X86_64 */
1368 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1369 static struct user_regset x86_32_regsets
[] __read_mostly
= {
1370 [REGSET_GENERAL
] = {
1371 .core_note_type
= NT_PRSTATUS
,
1372 .n
= sizeof(struct user_regs_struct32
) / sizeof(u32
),
1373 .size
= sizeof(u32
), .align
= sizeof(u32
),
1374 .get
= genregs32_get
, .set
= genregs32_set
1377 .core_note_type
= NT_PRFPREG
,
1378 .n
= sizeof(struct user_i387_ia32_struct
) / sizeof(u32
),
1379 .size
= sizeof(u32
), .align
= sizeof(u32
),
1380 .active
= fpregs_active
, .get
= fpregs_get
, .set
= fpregs_set
1383 .core_note_type
= NT_PRXFPREG
,
1384 .n
= sizeof(struct user32_fxsr_struct
) / sizeof(u32
),
1385 .size
= sizeof(u32
), .align
= sizeof(u32
),
1386 .active
= xfpregs_active
, .get
= xfpregs_get
, .set
= xfpregs_set
1389 .core_note_type
= NT_X86_XSTATE
,
1390 .size
= sizeof(u64
), .align
= sizeof(u64
),
1391 .active
= xstateregs_active
, .get
= xstateregs_get
,
1392 .set
= xstateregs_set
1395 .core_note_type
= NT_386_TLS
,
1396 .n
= GDT_ENTRY_TLS_ENTRIES
, .bias
= GDT_ENTRY_TLS_MIN
,
1397 .size
= sizeof(struct user_desc
),
1398 .align
= sizeof(struct user_desc
),
1399 .active
= regset_tls_active
,
1400 .get
= regset_tls_get
, .set
= regset_tls_set
1402 [REGSET_IOPERM32
] = {
1403 .core_note_type
= NT_386_IOPERM
,
1404 .n
= IO_BITMAP_BYTES
/ sizeof(u32
),
1405 .size
= sizeof(u32
), .align
= sizeof(u32
),
1406 .active
= ioperm_active
, .get
= ioperm_get
1410 static const struct user_regset_view user_x86_32_view
= {
1411 .name
= "i386", .e_machine
= EM_386
,
1412 .regsets
= x86_32_regsets
, .n
= ARRAY_SIZE(x86_32_regsets
)
1417 * This represents bytes 464..511 in the memory layout exported through
1418 * the REGSET_XSTATE interface.
1420 u64 xstate_fx_sw_bytes
[USER_XSTATE_FX_SW_WORDS
];
1422 void update_regset_xstate_info(unsigned int size
, u64 xstate_mask
)
1424 #ifdef CONFIG_X86_64
1425 x86_64_regsets
[REGSET_XSTATE
].n
= size
/ sizeof(u64
);
1427 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1428 x86_32_regsets
[REGSET_XSTATE
].n
= size
/ sizeof(u64
);
1430 xstate_fx_sw_bytes
[USER_XSTATE_XCR0_WORD
] = xstate_mask
;
1433 const struct user_regset_view
*task_user_regset_view(struct task_struct
*task
)
1435 #ifdef CONFIG_IA32_EMULATION
1436 if (test_tsk_thread_flag(task
, TIF_IA32
))
1438 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1439 return &user_x86_32_view
;
1441 #ifdef CONFIG_X86_64
1442 return &user_x86_64_view
;
1446 static void fill_sigtrap_info(struct task_struct
*tsk
,
1447 struct pt_regs
*regs
,
1448 int error_code
, int si_code
,
1449 struct siginfo
*info
)
1451 tsk
->thread
.trap_nr
= X86_TRAP_DB
;
1452 tsk
->thread
.error_code
= error_code
;
1454 memset(info
, 0, sizeof(*info
));
1455 info
->si_signo
= SIGTRAP
;
1456 info
->si_code
= si_code
;
1457 info
->si_addr
= user_mode_vm(regs
) ? (void __user
*)regs
->ip
: NULL
;
1460 void user_single_step_siginfo(struct task_struct
*tsk
,
1461 struct pt_regs
*regs
,
1462 struct siginfo
*info
)
1464 fill_sigtrap_info(tsk
, regs
, 0, TRAP_BRKPT
, info
);
1467 void send_sigtrap(struct task_struct
*tsk
, struct pt_regs
*regs
,
1468 int error_code
, int si_code
)
1470 struct siginfo info
;
1472 fill_sigtrap_info(tsk
, regs
, error_code
, si_code
, &info
);
1473 /* Send us the fake SIGTRAP */
1474 force_sig_info(SIGTRAP
, &info
, tsk
);
1478 #ifdef CONFIG_X86_32
1480 #elif defined CONFIG_IA32_EMULATION
1481 # define IS_IA32 is_compat_task()
1487 * We must return the syscall number to actually look up in the table.
1488 * This can be -1L to skip running any syscall at all.
1490 long syscall_trace_enter(struct pt_regs
*regs
)
1497 * If we stepped into a sysenter/syscall insn, it trapped in
1498 * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP.
1499 * If user-mode had set TF itself, then it's still clear from
1500 * do_debug() and we need to set it again to restore the user
1501 * state. If we entered on the slow path, TF was already set.
1503 if (test_thread_flag(TIF_SINGLESTEP
))
1504 regs
->flags
|= X86_EFLAGS_TF
;
1506 /* do the secure computing check first */
1507 if (secure_computing(regs
->orig_ax
)) {
1508 /* seccomp failures shouldn't expose any additional code. */
1513 if (unlikely(test_thread_flag(TIF_SYSCALL_EMU
)))
1516 if ((ret
|| test_thread_flag(TIF_SYSCALL_TRACE
)) &&
1517 tracehook_report_syscall_entry(regs
))
1520 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT
)))
1521 trace_sys_enter(regs
, regs
->orig_ax
);
1524 audit_syscall_entry(AUDIT_ARCH_I386
,
1527 regs
->dx
, regs
->si
);
1528 #ifdef CONFIG_X86_64
1530 audit_syscall_entry(AUDIT_ARCH_X86_64
,
1533 regs
->dx
, regs
->r10
);
1537 return ret
?: regs
->orig_ax
;
1540 void syscall_trace_leave(struct pt_regs
*regs
)
1545 * We may come here right after calling schedule_user()
1546 * or do_notify_resume(), in which case we can be in RCU
1551 audit_syscall_exit(regs
);
1553 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT
)))
1554 trace_sys_exit(regs
, regs
->ax
);
1557 * If TIF_SYSCALL_EMU is set, we only get here because of
1558 * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP).
1559 * We already reported this syscall instruction in
1560 * syscall_trace_enter().
1562 step
= unlikely(test_thread_flag(TIF_SINGLESTEP
)) &&
1563 !test_thread_flag(TIF_SYSCALL_EMU
);
1564 if (step
|| test_thread_flag(TIF_SYSCALL_TRACE
))
1565 tracehook_report_syscall_exit(regs
, step
);