1 /* By Ross Biro 1/23/92 */
3 * Pentium III FXSR, SSE support
4 * Gareth Hughes <gareth@valinux.com>, May 2000
7 #include <linux/kernel.h>
8 #include <linux/sched.h>
10 #include <linux/smp.h>
11 #include <linux/errno.h>
12 #include <linux/slab.h>
13 #include <linux/ptrace.h>
14 #include <linux/tracehook.h>
15 #include <linux/user.h>
16 #include <linux/elf.h>
17 #include <linux/security.h>
18 #include <linux/audit.h>
19 #include <linux/seccomp.h>
20 #include <linux/signal.h>
21 #include <linux/perf_event.h>
22 #include <linux/hw_breakpoint.h>
23 #include <linux/rcupdate.h>
24 #include <linux/export.h>
25 #include <linux/context_tracking.h>
27 #include <asm/uaccess.h>
28 #include <asm/pgtable.h>
29 #include <asm/processor.h>
30 #include <asm/fpu/internal.h>
31 #include <asm/fpu/signal.h>
32 #include <asm/fpu/regset.h>
33 #include <asm/debugreg.h>
36 #include <asm/prctl.h>
37 #include <asm/proto.h>
38 #include <asm/hw_breakpoint.h>
39 #include <asm/traps.h>
40 #include <asm/syscall.h>
48 REGSET_IOPERM64
= REGSET_XFP
,
54 struct pt_regs_offset
{
59 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
60 #define REG_OFFSET_END {.name = NULL, .offset = 0}
62 static const struct pt_regs_offset regoffset_table
[] = {
86 REG_OFFSET_NAME(orig_ax
),
89 REG_OFFSET_NAME(flags
),
96 * regs_query_register_offset() - query register offset from its name
97 * @name: the name of a register
99 * regs_query_register_offset() returns the offset of a register in struct
100 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
102 int regs_query_register_offset(const char *name
)
104 const struct pt_regs_offset
*roff
;
105 for (roff
= regoffset_table
; roff
->name
!= NULL
; roff
++)
106 if (!strcmp(roff
->name
, name
))
112 * regs_query_register_name() - query register name from its offset
113 * @offset: the offset of a register in struct pt_regs.
115 * regs_query_register_name() returns the name of a register from its
116 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
118 const char *regs_query_register_name(unsigned int offset
)
120 const struct pt_regs_offset
*roff
;
121 for (roff
= regoffset_table
; roff
->name
!= NULL
; roff
++)
122 if (roff
->offset
== offset
)
128 * does not yet catch signals sent when the child dies.
129 * in exit.c or in signal.c.
133 * Determines which flags the user has access to [1 = access, 0 = no access].
135 #define FLAG_MASK_32 ((unsigned long) \
136 (X86_EFLAGS_CF | X86_EFLAGS_PF | \
137 X86_EFLAGS_AF | X86_EFLAGS_ZF | \
138 X86_EFLAGS_SF | X86_EFLAGS_TF | \
139 X86_EFLAGS_DF | X86_EFLAGS_OF | \
140 X86_EFLAGS_RF | X86_EFLAGS_AC))
143 * Determines whether a value may be installed in a segment register.
145 static inline bool invalid_selector(u16 value
)
147 return unlikely(value
!= 0 && (value
& SEGMENT_RPL_MASK
) != USER_RPL
);
152 #define FLAG_MASK FLAG_MASK_32
155 * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
156 * when it traps. The previous stack will be directly underneath the saved
157 * registers, and 'sp/ss' won't even have been saved. Thus the '®s->sp'.
159 * Now, if the stack is empty, '®s->sp' is out of range. In this
160 * case we try to take the previous stack. To always return a non-null
161 * stack pointer we fall back to regs as stack if no previous stack
164 * This is valid only for kernel mode traps.
166 unsigned long kernel_stack_pointer(struct pt_regs
*regs
)
168 unsigned long context
= (unsigned long)regs
& ~(THREAD_SIZE
- 1);
169 unsigned long sp
= (unsigned long)®s
->sp
;
172 if (context
== (sp
& ~(THREAD_SIZE
- 1)))
175 prev_esp
= (u32
*)(context
);
177 return (unsigned long)prev_esp
;
179 return (unsigned long)regs
;
181 EXPORT_SYMBOL_GPL(kernel_stack_pointer
);
183 static unsigned long *pt_regs_access(struct pt_regs
*regs
, unsigned long regno
)
185 BUILD_BUG_ON(offsetof(struct pt_regs
, bx
) != 0);
186 return ®s
->bx
+ (regno
>> 2);
189 static u16
get_segment_reg(struct task_struct
*task
, unsigned long offset
)
192 * Returning the value truncates it to 16 bits.
195 if (offset
!= offsetof(struct user_regs_struct
, gs
))
196 retval
= *pt_regs_access(task_pt_regs(task
), offset
);
199 retval
= get_user_gs(task_pt_regs(task
));
201 retval
= task_user_gs(task
);
206 static int set_segment_reg(struct task_struct
*task
,
207 unsigned long offset
, u16 value
)
210 * The value argument was already truncated to 16 bits.
212 if (invalid_selector(value
))
216 * For %cs and %ss we cannot permit a null selector.
217 * We can permit a bogus selector as long as it has USER_RPL.
218 * Null selectors are fine for other segment registers, but
219 * we will never get back to user mode with invalid %cs or %ss
220 * and will take the trap in iret instead. Much code relies
221 * on user_mode() to distinguish a user trap frame (which can
222 * safely use invalid selectors) from a kernel trap frame.
225 case offsetof(struct user_regs_struct
, cs
):
226 case offsetof(struct user_regs_struct
, ss
):
227 if (unlikely(value
== 0))
231 *pt_regs_access(task_pt_regs(task
), offset
) = value
;
234 case offsetof(struct user_regs_struct
, gs
):
236 set_user_gs(task_pt_regs(task
), value
);
238 task_user_gs(task
) = value
;
244 #else /* CONFIG_X86_64 */
246 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
248 static unsigned long *pt_regs_access(struct pt_regs
*regs
, unsigned long offset
)
250 BUILD_BUG_ON(offsetof(struct pt_regs
, r15
) != 0);
251 return ®s
->r15
+ (offset
/ sizeof(regs
->r15
));
254 static u16
get_segment_reg(struct task_struct
*task
, unsigned long offset
)
257 * Returning the value truncates it to 16 bits.
262 case offsetof(struct user_regs_struct
, fs
):
263 if (task
== current
) {
264 /* Older gas can't assemble movq %?s,%r?? */
265 asm("movl %%fs,%0" : "=r" (seg
));
268 return task
->thread
.fsindex
;
269 case offsetof(struct user_regs_struct
, gs
):
270 if (task
== current
) {
271 asm("movl %%gs,%0" : "=r" (seg
));
274 return task
->thread
.gsindex
;
275 case offsetof(struct user_regs_struct
, ds
):
276 if (task
== current
) {
277 asm("movl %%ds,%0" : "=r" (seg
));
280 return task
->thread
.ds
;
281 case offsetof(struct user_regs_struct
, es
):
282 if (task
== current
) {
283 asm("movl %%es,%0" : "=r" (seg
));
286 return task
->thread
.es
;
288 case offsetof(struct user_regs_struct
, cs
):
289 case offsetof(struct user_regs_struct
, ss
):
292 return *pt_regs_access(task_pt_regs(task
), offset
);
295 static int set_segment_reg(struct task_struct
*task
,
296 unsigned long offset
, u16 value
)
299 * The value argument was already truncated to 16 bits.
301 if (invalid_selector(value
))
305 case offsetof(struct user_regs_struct
,fs
):
306 task
->thread
.fsindex
= value
;
308 loadsegment(fs
, task
->thread
.fsindex
);
310 case offsetof(struct user_regs_struct
,gs
):
311 task
->thread
.gsindex
= value
;
313 load_gs_index(task
->thread
.gsindex
);
315 case offsetof(struct user_regs_struct
,ds
):
316 task
->thread
.ds
= value
;
318 loadsegment(ds
, task
->thread
.ds
);
320 case offsetof(struct user_regs_struct
,es
):
321 task
->thread
.es
= value
;
323 loadsegment(es
, task
->thread
.es
);
327 * Can't actually change these in 64-bit mode.
329 case offsetof(struct user_regs_struct
,cs
):
330 if (unlikely(value
== 0))
332 task_pt_regs(task
)->cs
= value
;
334 case offsetof(struct user_regs_struct
,ss
):
335 if (unlikely(value
== 0))
337 task_pt_regs(task
)->ss
= value
;
344 #endif /* CONFIG_X86_32 */
346 static unsigned long get_flags(struct task_struct
*task
)
348 unsigned long retval
= task_pt_regs(task
)->flags
;
351 * If the debugger set TF, hide it from the readout.
353 if (test_tsk_thread_flag(task
, TIF_FORCED_TF
))
354 retval
&= ~X86_EFLAGS_TF
;
359 static int set_flags(struct task_struct
*task
, unsigned long value
)
361 struct pt_regs
*regs
= task_pt_regs(task
);
364 * If the user value contains TF, mark that
365 * it was not "us" (the debugger) that set it.
366 * If not, make sure it stays set if we had.
368 if (value
& X86_EFLAGS_TF
)
369 clear_tsk_thread_flag(task
, TIF_FORCED_TF
);
370 else if (test_tsk_thread_flag(task
, TIF_FORCED_TF
))
371 value
|= X86_EFLAGS_TF
;
373 regs
->flags
= (regs
->flags
& ~FLAG_MASK
) | (value
& FLAG_MASK
);
378 static int putreg(struct task_struct
*child
,
379 unsigned long offset
, unsigned long value
)
382 case offsetof(struct user_regs_struct
, cs
):
383 case offsetof(struct user_regs_struct
, ds
):
384 case offsetof(struct user_regs_struct
, es
):
385 case offsetof(struct user_regs_struct
, fs
):
386 case offsetof(struct user_regs_struct
, gs
):
387 case offsetof(struct user_regs_struct
, ss
):
388 return set_segment_reg(child
, offset
, value
);
390 case offsetof(struct user_regs_struct
, flags
):
391 return set_flags(child
, value
);
394 case offsetof(struct user_regs_struct
,fs_base
):
395 if (value
>= TASK_SIZE_OF(child
))
398 * When changing the segment base, use do_arch_prctl
399 * to set either thread.fs or thread.fsindex and the
400 * corresponding GDT slot.
402 if (child
->thread
.fsbase
!= value
)
403 return do_arch_prctl(child
, ARCH_SET_FS
, value
);
405 case offsetof(struct user_regs_struct
,gs_base
):
407 * Exactly the same here as the %fs handling above.
409 if (value
>= TASK_SIZE_OF(child
))
411 if (child
->thread
.gsbase
!= value
)
412 return do_arch_prctl(child
, ARCH_SET_GS
, value
);
417 *pt_regs_access(task_pt_regs(child
), offset
) = value
;
421 static unsigned long getreg(struct task_struct
*task
, unsigned long offset
)
424 case offsetof(struct user_regs_struct
, cs
):
425 case offsetof(struct user_regs_struct
, ds
):
426 case offsetof(struct user_regs_struct
, es
):
427 case offsetof(struct user_regs_struct
, fs
):
428 case offsetof(struct user_regs_struct
, gs
):
429 case offsetof(struct user_regs_struct
, ss
):
430 return get_segment_reg(task
, offset
);
432 case offsetof(struct user_regs_struct
, flags
):
433 return get_flags(task
);
436 case offsetof(struct user_regs_struct
, fs_base
): {
438 * XXX: This will not behave as expected if called on
439 * current or if fsindex != 0.
441 return task
->thread
.fsbase
;
443 case offsetof(struct user_regs_struct
, gs_base
): {
445 * XXX: This will not behave as expected if called on
446 * current or if fsindex != 0.
448 return task
->thread
.gsbase
;
453 return *pt_regs_access(task_pt_regs(task
), offset
);
456 static int genregs_get(struct task_struct
*target
,
457 const struct user_regset
*regset
,
458 unsigned int pos
, unsigned int count
,
459 void *kbuf
, void __user
*ubuf
)
462 unsigned long *k
= kbuf
;
463 while (count
>= sizeof(*k
)) {
464 *k
++ = getreg(target
, pos
);
469 unsigned long __user
*u
= ubuf
;
470 while (count
>= sizeof(*u
)) {
471 if (__put_user(getreg(target
, pos
), u
++))
481 static int genregs_set(struct task_struct
*target
,
482 const struct user_regset
*regset
,
483 unsigned int pos
, unsigned int count
,
484 const void *kbuf
, const void __user
*ubuf
)
488 const unsigned long *k
= kbuf
;
489 while (count
>= sizeof(*k
) && !ret
) {
490 ret
= putreg(target
, pos
, *k
++);
495 const unsigned long __user
*u
= ubuf
;
496 while (count
>= sizeof(*u
) && !ret
) {
498 ret
= __get_user(word
, u
++);
501 ret
= putreg(target
, pos
, word
);
509 static void ptrace_triggered(struct perf_event
*bp
,
510 struct perf_sample_data
*data
,
511 struct pt_regs
*regs
)
514 struct thread_struct
*thread
= &(current
->thread
);
517 * Store in the virtual DR6 register the fact that the breakpoint
518 * was hit so the thread's debugger will see it.
520 for (i
= 0; i
< HBP_NUM
; i
++) {
521 if (thread
->ptrace_bps
[i
] == bp
)
525 thread
->debugreg6
|= (DR_TRAP0
<< i
);
529 * Walk through every ptrace breakpoints for this thread and
530 * build the dr7 value on top of their attributes.
533 static unsigned long ptrace_get_dr7(struct perf_event
*bp
[])
537 struct arch_hw_breakpoint
*info
;
539 for (i
= 0; i
< HBP_NUM
; i
++) {
540 if (bp
[i
] && !bp
[i
]->attr
.disabled
) {
541 info
= counter_arch_bp(bp
[i
]);
542 dr7
|= encode_dr7(i
, info
->len
, info
->type
);
549 static int ptrace_fill_bp_fields(struct perf_event_attr
*attr
,
550 int len
, int type
, bool disabled
)
552 int err
, bp_len
, bp_type
;
554 err
= arch_bp_generic_fields(len
, type
, &bp_len
, &bp_type
);
556 attr
->bp_len
= bp_len
;
557 attr
->bp_type
= bp_type
;
558 attr
->disabled
= disabled
;
564 static struct perf_event
*
565 ptrace_register_breakpoint(struct task_struct
*tsk
, int len
, int type
,
566 unsigned long addr
, bool disabled
)
568 struct perf_event_attr attr
;
571 ptrace_breakpoint_init(&attr
);
574 err
= ptrace_fill_bp_fields(&attr
, len
, type
, disabled
);
578 return register_user_hw_breakpoint(&attr
, ptrace_triggered
,
582 static int ptrace_modify_breakpoint(struct perf_event
*bp
, int len
, int type
,
585 struct perf_event_attr attr
= bp
->attr
;
588 err
= ptrace_fill_bp_fields(&attr
, len
, type
, disabled
);
592 return modify_user_hw_breakpoint(bp
, &attr
);
596 * Handle ptrace writes to debug register 7.
598 static int ptrace_write_dr7(struct task_struct
*tsk
, unsigned long data
)
600 struct thread_struct
*thread
= &tsk
->thread
;
601 unsigned long old_dr7
;
602 bool second_pass
= false;
605 data
&= ~DR_CONTROL_RESERVED
;
606 old_dr7
= ptrace_get_dr7(thread
->ptrace_bps
);
610 for (i
= 0; i
< HBP_NUM
; i
++) {
612 bool disabled
= !decode_dr7(data
, i
, &len
, &type
);
613 struct perf_event
*bp
= thread
->ptrace_bps
[i
];
619 bp
= ptrace_register_breakpoint(tsk
,
620 len
, type
, 0, disabled
);
626 thread
->ptrace_bps
[i
] = bp
;
630 rc
= ptrace_modify_breakpoint(bp
, len
, type
, disabled
);
635 /* Restore if the first pass failed, second_pass shouldn't fail. */
636 if (rc
&& !WARN_ON(second_pass
)) {
647 * Handle PTRACE_PEEKUSR calls for the debug register area.
649 static unsigned long ptrace_get_debugreg(struct task_struct
*tsk
, int n
)
651 struct thread_struct
*thread
= &tsk
->thread
;
652 unsigned long val
= 0;
655 struct perf_event
*bp
= thread
->ptrace_bps
[n
];
658 val
= bp
->hw
.info
.address
;
660 val
= thread
->debugreg6
;
662 val
= thread
->ptrace_dr7
;
667 static int ptrace_set_breakpoint_addr(struct task_struct
*tsk
, int nr
,
670 struct thread_struct
*t
= &tsk
->thread
;
671 struct perf_event
*bp
= t
->ptrace_bps
[nr
];
676 * Put stub len and type to create an inactive but correct bp.
678 * CHECKME: the previous code returned -EIO if the addr wasn't
679 * a valid task virtual addr. The new one will return -EINVAL in
681 * -EINVAL may be what we want for in-kernel breakpoints users,
682 * but -EIO looks better for ptrace, since we refuse a register
683 * writing for the user. And anyway this is the previous
686 bp
= ptrace_register_breakpoint(tsk
,
687 X86_BREAKPOINT_LEN_1
, X86_BREAKPOINT_WRITE
,
692 t
->ptrace_bps
[nr
] = bp
;
694 struct perf_event_attr attr
= bp
->attr
;
697 err
= modify_user_hw_breakpoint(bp
, &attr
);
704 * Handle PTRACE_POKEUSR calls for the debug register area.
706 static int ptrace_set_debugreg(struct task_struct
*tsk
, int n
,
709 struct thread_struct
*thread
= &tsk
->thread
;
710 /* There are no DR4 or DR5 registers */
714 rc
= ptrace_set_breakpoint_addr(tsk
, n
, val
);
716 thread
->debugreg6
= val
;
719 rc
= ptrace_write_dr7(tsk
, val
);
721 thread
->ptrace_dr7
= val
;
727 * These access the current or another (stopped) task's io permission
728 * bitmap for debugging or core dump.
730 static int ioperm_active(struct task_struct
*target
,
731 const struct user_regset
*regset
)
733 return target
->thread
.io_bitmap_max
/ regset
->size
;
736 static int ioperm_get(struct task_struct
*target
,
737 const struct user_regset
*regset
,
738 unsigned int pos
, unsigned int count
,
739 void *kbuf
, void __user
*ubuf
)
741 if (!target
->thread
.io_bitmap_ptr
)
744 return user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
,
745 target
->thread
.io_bitmap_ptr
,
750 * Called by kernel/ptrace.c when detaching..
752 * Make sure the single step bit is not set.
754 void ptrace_disable(struct task_struct
*child
)
756 user_disable_single_step(child
);
757 #ifdef TIF_SYSCALL_EMU
758 clear_tsk_thread_flag(child
, TIF_SYSCALL_EMU
);
762 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
763 static const struct user_regset_view user_x86_32_view
; /* Initialized below. */
766 long arch_ptrace(struct task_struct
*child
, long request
,
767 unsigned long addr
, unsigned long data
)
770 unsigned long __user
*datap
= (unsigned long __user
*)data
;
773 /* read the word at location addr in the USER area. */
774 case PTRACE_PEEKUSR
: {
778 if ((addr
& (sizeof(data
) - 1)) || addr
>= sizeof(struct user
))
781 tmp
= 0; /* Default return condition */
782 if (addr
< sizeof(struct user_regs_struct
))
783 tmp
= getreg(child
, addr
);
784 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
785 addr
<= offsetof(struct user
, u_debugreg
[7])) {
786 addr
-= offsetof(struct user
, u_debugreg
[0]);
787 tmp
= ptrace_get_debugreg(child
, addr
/ sizeof(data
));
789 ret
= put_user(tmp
, datap
);
793 case PTRACE_POKEUSR
: /* write the word at location addr in the USER area */
795 if ((addr
& (sizeof(data
) - 1)) || addr
>= sizeof(struct user
))
798 if (addr
< sizeof(struct user_regs_struct
))
799 ret
= putreg(child
, addr
, data
);
800 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
801 addr
<= offsetof(struct user
, u_debugreg
[7])) {
802 addr
-= offsetof(struct user
, u_debugreg
[0]);
803 ret
= ptrace_set_debugreg(child
,
804 addr
/ sizeof(data
), data
);
808 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
809 return copy_regset_to_user(child
,
810 task_user_regset_view(current
),
812 0, sizeof(struct user_regs_struct
),
815 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
816 return copy_regset_from_user(child
,
817 task_user_regset_view(current
),
819 0, sizeof(struct user_regs_struct
),
822 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
823 return copy_regset_to_user(child
,
824 task_user_regset_view(current
),
826 0, sizeof(struct user_i387_struct
),
829 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
830 return copy_regset_from_user(child
,
831 task_user_regset_view(current
),
833 0, sizeof(struct user_i387_struct
),
837 case PTRACE_GETFPXREGS
: /* Get the child extended FPU state. */
838 return copy_regset_to_user(child
, &user_x86_32_view
,
840 0, sizeof(struct user_fxsr_struct
),
843 case PTRACE_SETFPXREGS
: /* Set the child extended FPU state. */
844 return copy_regset_from_user(child
, &user_x86_32_view
,
846 0, sizeof(struct user_fxsr_struct
),
850 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
851 case PTRACE_GET_THREAD_AREA
:
854 ret
= do_get_thread_area(child
, addr
,
855 (struct user_desc __user
*)data
);
858 case PTRACE_SET_THREAD_AREA
:
861 ret
= do_set_thread_area(child
, addr
,
862 (struct user_desc __user
*)data
, 0);
867 /* normal 64bit interface to access TLS data.
868 Works just like arch_prctl, except that the arguments
870 case PTRACE_ARCH_PRCTL
:
871 ret
= do_arch_prctl(child
, data
, addr
);
876 ret
= ptrace_request(child
, request
, addr
, data
);
883 #ifdef CONFIG_IA32_EMULATION
885 #include <linux/compat.h>
886 #include <linux/syscalls.h>
887 #include <asm/ia32.h>
888 #include <asm/user32.h>
891 case offsetof(struct user32, regs.l): \
892 regs->q = value; break
895 case offsetof(struct user32, regs.rs): \
896 return set_segment_reg(child, \
897 offsetof(struct user_regs_struct, rs), \
901 static int putreg32(struct task_struct
*child
, unsigned regno
, u32 value
)
903 struct pt_regs
*regs
= task_pt_regs(child
);
924 case offsetof(struct user32
, regs
.orig_eax
):
926 * A 32-bit debugger setting orig_eax means to restore
927 * the state of the task restarting a 32-bit syscall.
928 * Make sure we interpret the -ERESTART* codes correctly
929 * in case the task is not actually still sitting at the
930 * exit from a 32-bit syscall with TS_COMPAT still set.
932 regs
->orig_ax
= value
;
933 if (syscall_get_nr(child
, regs
) >= 0)
934 task_thread_info(child
)->status
|= TS_COMPAT
;
937 case offsetof(struct user32
, regs
.eflags
):
938 return set_flags(child
, value
);
940 case offsetof(struct user32
, u_debugreg
[0]) ...
941 offsetof(struct user32
, u_debugreg
[7]):
942 regno
-= offsetof(struct user32
, u_debugreg
[0]);
943 return ptrace_set_debugreg(child
, regno
/ 4, value
);
946 if (regno
> sizeof(struct user32
) || (regno
& 3))
950 * Other dummy fields in the virtual user structure
962 case offsetof(struct user32, regs.l): \
963 *val = regs->q; break
966 case offsetof(struct user32, regs.rs): \
967 *val = get_segment_reg(child, \
968 offsetof(struct user_regs_struct, rs)); \
971 static int getreg32(struct task_struct
*child
, unsigned regno
, u32
*val
)
973 struct pt_regs
*regs
= task_pt_regs(child
);
991 R32(orig_eax
, orig_ax
);
995 case offsetof(struct user32
, regs
.eflags
):
996 *val
= get_flags(child
);
999 case offsetof(struct user32
, u_debugreg
[0]) ...
1000 offsetof(struct user32
, u_debugreg
[7]):
1001 regno
-= offsetof(struct user32
, u_debugreg
[0]);
1002 *val
= ptrace_get_debugreg(child
, regno
/ 4);
1006 if (regno
> sizeof(struct user32
) || (regno
& 3))
1010 * Other dummy fields in the virtual user structure
1022 static int genregs32_get(struct task_struct
*target
,
1023 const struct user_regset
*regset
,
1024 unsigned int pos
, unsigned int count
,
1025 void *kbuf
, void __user
*ubuf
)
1028 compat_ulong_t
*k
= kbuf
;
1029 while (count
>= sizeof(*k
)) {
1030 getreg32(target
, pos
, k
++);
1031 count
-= sizeof(*k
);
1035 compat_ulong_t __user
*u
= ubuf
;
1036 while (count
>= sizeof(*u
)) {
1037 compat_ulong_t word
;
1038 getreg32(target
, pos
, &word
);
1039 if (__put_user(word
, u
++))
1041 count
-= sizeof(*u
);
1049 static int genregs32_set(struct task_struct
*target
,
1050 const struct user_regset
*regset
,
1051 unsigned int pos
, unsigned int count
,
1052 const void *kbuf
, const void __user
*ubuf
)
1056 const compat_ulong_t
*k
= kbuf
;
1057 while (count
>= sizeof(*k
) && !ret
) {
1058 ret
= putreg32(target
, pos
, *k
++);
1059 count
-= sizeof(*k
);
1063 const compat_ulong_t __user
*u
= ubuf
;
1064 while (count
>= sizeof(*u
) && !ret
) {
1065 compat_ulong_t word
;
1066 ret
= __get_user(word
, u
++);
1069 ret
= putreg32(target
, pos
, word
);
1070 count
-= sizeof(*u
);
1077 static long ia32_arch_ptrace(struct task_struct
*child
, compat_long_t request
,
1078 compat_ulong_t caddr
, compat_ulong_t cdata
)
1080 unsigned long addr
= caddr
;
1081 unsigned long data
= cdata
;
1082 void __user
*datap
= compat_ptr(data
);
1087 case PTRACE_PEEKUSR
:
1088 ret
= getreg32(child
, addr
, &val
);
1090 ret
= put_user(val
, (__u32 __user
*)datap
);
1093 case PTRACE_POKEUSR
:
1094 ret
= putreg32(child
, addr
, data
);
1097 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
1098 return copy_regset_to_user(child
, &user_x86_32_view
,
1100 0, sizeof(struct user_regs_struct32
),
1103 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
1104 return copy_regset_from_user(child
, &user_x86_32_view
,
1106 sizeof(struct user_regs_struct32
),
1109 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
1110 return copy_regset_to_user(child
, &user_x86_32_view
,
1112 sizeof(struct user_i387_ia32_struct
),
1115 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
1116 return copy_regset_from_user(
1117 child
, &user_x86_32_view
, REGSET_FP
,
1118 0, sizeof(struct user_i387_ia32_struct
), datap
);
1120 case PTRACE_GETFPXREGS
: /* Get the child extended FPU state. */
1121 return copy_regset_to_user(child
, &user_x86_32_view
,
1123 sizeof(struct user32_fxsr_struct
),
1126 case PTRACE_SETFPXREGS
: /* Set the child extended FPU state. */
1127 return copy_regset_from_user(child
, &user_x86_32_view
,
1129 sizeof(struct user32_fxsr_struct
),
1132 case PTRACE_GET_THREAD_AREA
:
1133 case PTRACE_SET_THREAD_AREA
:
1134 return arch_ptrace(child
, request
, addr
, data
);
1137 return compat_ptrace_request(child
, request
, addr
, data
);
1142 #endif /* CONFIG_IA32_EMULATION */
1144 #ifdef CONFIG_X86_X32_ABI
1145 static long x32_arch_ptrace(struct task_struct
*child
,
1146 compat_long_t request
, compat_ulong_t caddr
,
1147 compat_ulong_t cdata
)
1149 unsigned long addr
= caddr
;
1150 unsigned long data
= cdata
;
1151 void __user
*datap
= compat_ptr(data
);
1155 /* Read 32bits at location addr in the USER area. Only allow
1156 to return the lower 32bits of segment and debug registers. */
1157 case PTRACE_PEEKUSR
: {
1161 if ((addr
& (sizeof(data
) - 1)) || addr
>= sizeof(struct user
) ||
1162 addr
< offsetof(struct user_regs_struct
, cs
))
1165 tmp
= 0; /* Default return condition */
1166 if (addr
< sizeof(struct user_regs_struct
))
1167 tmp
= getreg(child
, addr
);
1168 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
1169 addr
<= offsetof(struct user
, u_debugreg
[7])) {
1170 addr
-= offsetof(struct user
, u_debugreg
[0]);
1171 tmp
= ptrace_get_debugreg(child
, addr
/ sizeof(data
));
1173 ret
= put_user(tmp
, (__u32 __user
*)datap
);
1177 /* Write the word at location addr in the USER area. Only allow
1178 to update segment and debug registers with the upper 32bits
1180 case PTRACE_POKEUSR
:
1182 if ((addr
& (sizeof(data
) - 1)) || addr
>= sizeof(struct user
) ||
1183 addr
< offsetof(struct user_regs_struct
, cs
))
1186 if (addr
< sizeof(struct user_regs_struct
))
1187 ret
= putreg(child
, addr
, data
);
1188 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
1189 addr
<= offsetof(struct user
, u_debugreg
[7])) {
1190 addr
-= offsetof(struct user
, u_debugreg
[0]);
1191 ret
= ptrace_set_debugreg(child
,
1192 addr
/ sizeof(data
), data
);
1196 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
1197 return copy_regset_to_user(child
,
1198 task_user_regset_view(current
),
1200 0, sizeof(struct user_regs_struct
),
1203 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
1204 return copy_regset_from_user(child
,
1205 task_user_regset_view(current
),
1207 0, sizeof(struct user_regs_struct
),
1210 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
1211 return copy_regset_to_user(child
,
1212 task_user_regset_view(current
),
1214 0, sizeof(struct user_i387_struct
),
1217 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
1218 return copy_regset_from_user(child
,
1219 task_user_regset_view(current
),
1221 0, sizeof(struct user_i387_struct
),
1225 return compat_ptrace_request(child
, request
, addr
, data
);
1232 #ifdef CONFIG_COMPAT
1233 long compat_arch_ptrace(struct task_struct
*child
, compat_long_t request
,
1234 compat_ulong_t caddr
, compat_ulong_t cdata
)
1236 #ifdef CONFIG_X86_X32_ABI
1237 if (!in_ia32_syscall())
1238 return x32_arch_ptrace(child
, request
, caddr
, cdata
);
1240 #ifdef CONFIG_IA32_EMULATION
1241 return ia32_arch_ptrace(child
, request
, caddr
, cdata
);
1246 #endif /* CONFIG_COMPAT */
1248 #ifdef CONFIG_X86_64
1250 static struct user_regset x86_64_regsets
[] __read_mostly
= {
1251 [REGSET_GENERAL
] = {
1252 .core_note_type
= NT_PRSTATUS
,
1253 .n
= sizeof(struct user_regs_struct
) / sizeof(long),
1254 .size
= sizeof(long), .align
= sizeof(long),
1255 .get
= genregs_get
, .set
= genregs_set
1258 .core_note_type
= NT_PRFPREG
,
1259 .n
= sizeof(struct user_i387_struct
) / sizeof(long),
1260 .size
= sizeof(long), .align
= sizeof(long),
1261 .active
= regset_xregset_fpregs_active
, .get
= xfpregs_get
, .set
= xfpregs_set
1264 .core_note_type
= NT_X86_XSTATE
,
1265 .size
= sizeof(u64
), .align
= sizeof(u64
),
1266 .active
= xstateregs_active
, .get
= xstateregs_get
,
1267 .set
= xstateregs_set
1269 [REGSET_IOPERM64
] = {
1270 .core_note_type
= NT_386_IOPERM
,
1271 .n
= IO_BITMAP_LONGS
,
1272 .size
= sizeof(long), .align
= sizeof(long),
1273 .active
= ioperm_active
, .get
= ioperm_get
1277 static const struct user_regset_view user_x86_64_view
= {
1278 .name
= "x86_64", .e_machine
= EM_X86_64
,
1279 .regsets
= x86_64_regsets
, .n
= ARRAY_SIZE(x86_64_regsets
)
1282 #else /* CONFIG_X86_32 */
1284 #define user_regs_struct32 user_regs_struct
1285 #define genregs32_get genregs_get
1286 #define genregs32_set genregs_set
1288 #endif /* CONFIG_X86_64 */
1290 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1291 static struct user_regset x86_32_regsets
[] __read_mostly
= {
1292 [REGSET_GENERAL
] = {
1293 .core_note_type
= NT_PRSTATUS
,
1294 .n
= sizeof(struct user_regs_struct32
) / sizeof(u32
),
1295 .size
= sizeof(u32
), .align
= sizeof(u32
),
1296 .get
= genregs32_get
, .set
= genregs32_set
1299 .core_note_type
= NT_PRFPREG
,
1300 .n
= sizeof(struct user_i387_ia32_struct
) / sizeof(u32
),
1301 .size
= sizeof(u32
), .align
= sizeof(u32
),
1302 .active
= regset_fpregs_active
, .get
= fpregs_get
, .set
= fpregs_set
1305 .core_note_type
= NT_PRXFPREG
,
1306 .n
= sizeof(struct user32_fxsr_struct
) / sizeof(u32
),
1307 .size
= sizeof(u32
), .align
= sizeof(u32
),
1308 .active
= regset_xregset_fpregs_active
, .get
= xfpregs_get
, .set
= xfpregs_set
1311 .core_note_type
= NT_X86_XSTATE
,
1312 .size
= sizeof(u64
), .align
= sizeof(u64
),
1313 .active
= xstateregs_active
, .get
= xstateregs_get
,
1314 .set
= xstateregs_set
1317 .core_note_type
= NT_386_TLS
,
1318 .n
= GDT_ENTRY_TLS_ENTRIES
, .bias
= GDT_ENTRY_TLS_MIN
,
1319 .size
= sizeof(struct user_desc
),
1320 .align
= sizeof(struct user_desc
),
1321 .active
= regset_tls_active
,
1322 .get
= regset_tls_get
, .set
= regset_tls_set
1324 [REGSET_IOPERM32
] = {
1325 .core_note_type
= NT_386_IOPERM
,
1326 .n
= IO_BITMAP_BYTES
/ sizeof(u32
),
1327 .size
= sizeof(u32
), .align
= sizeof(u32
),
1328 .active
= ioperm_active
, .get
= ioperm_get
1332 static const struct user_regset_view user_x86_32_view
= {
1333 .name
= "i386", .e_machine
= EM_386
,
1334 .regsets
= x86_32_regsets
, .n
= ARRAY_SIZE(x86_32_regsets
)
1339 * This represents bytes 464..511 in the memory layout exported through
1340 * the REGSET_XSTATE interface.
1342 u64 xstate_fx_sw_bytes
[USER_XSTATE_FX_SW_WORDS
];
1344 void update_regset_xstate_info(unsigned int size
, u64 xstate_mask
)
1346 #ifdef CONFIG_X86_64
1347 x86_64_regsets
[REGSET_XSTATE
].n
= size
/ sizeof(u64
);
1349 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1350 x86_32_regsets
[REGSET_XSTATE
].n
= size
/ sizeof(u64
);
1352 xstate_fx_sw_bytes
[USER_XSTATE_XCR0_WORD
] = xstate_mask
;
1355 const struct user_regset_view
*task_user_regset_view(struct task_struct
*task
)
1357 #ifdef CONFIG_IA32_EMULATION
1358 if (test_tsk_thread_flag(task
, TIF_IA32
))
1360 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1361 return &user_x86_32_view
;
1363 #ifdef CONFIG_X86_64
1364 return &user_x86_64_view
;
1368 static void fill_sigtrap_info(struct task_struct
*tsk
,
1369 struct pt_regs
*regs
,
1370 int error_code
, int si_code
,
1371 struct siginfo
*info
)
1373 tsk
->thread
.trap_nr
= X86_TRAP_DB
;
1374 tsk
->thread
.error_code
= error_code
;
1376 memset(info
, 0, sizeof(*info
));
1377 info
->si_signo
= SIGTRAP
;
1378 info
->si_code
= si_code
;
1379 info
->si_addr
= user_mode(regs
) ? (void __user
*)regs
->ip
: NULL
;
1382 void user_single_step_siginfo(struct task_struct
*tsk
,
1383 struct pt_regs
*regs
,
1384 struct siginfo
*info
)
1386 fill_sigtrap_info(tsk
, regs
, 0, TRAP_BRKPT
, info
);
1389 void send_sigtrap(struct task_struct
*tsk
, struct pt_regs
*regs
,
1390 int error_code
, int si_code
)
1392 struct siginfo info
;
1394 fill_sigtrap_info(tsk
, regs
, error_code
, si_code
, &info
);
1395 /* Send us the fake SIGTRAP */
1396 force_sig_info(SIGTRAP
, &info
, tsk
);