1 /* By Ross Biro 1/23/92 */
3 * Pentium III FXSR, SSE support
4 * Gareth Hughes <gareth@valinux.com>, May 2000
7 * Markus Metzger <markus.t.metzger@intel.com>, Dec 2007
10 #include <linux/kernel.h>
11 #include <linux/sched.h>
13 #include <linux/smp.h>
14 #include <linux/errno.h>
15 #include <linux/ptrace.h>
16 #include <linux/regset.h>
17 #include <linux/tracehook.h>
18 #include <linux/user.h>
19 #include <linux/elf.h>
20 #include <linux/security.h>
21 #include <linux/audit.h>
22 #include <linux/seccomp.h>
23 #include <linux/signal.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>
47 * does not yet catch signals sent when the child dies.
48 * in exit.c or in signal.c.
52 * Determines which flags the user has access to [1 = access, 0 = no access].
54 #define FLAG_MASK_32 ((unsigned long) \
55 (X86_EFLAGS_CF | X86_EFLAGS_PF | \
56 X86_EFLAGS_AF | X86_EFLAGS_ZF | \
57 X86_EFLAGS_SF | X86_EFLAGS_TF | \
58 X86_EFLAGS_DF | X86_EFLAGS_OF | \
59 X86_EFLAGS_RF | X86_EFLAGS_AC))
62 * Determines whether a value may be installed in a segment register.
64 static inline bool invalid_selector(u16 value
)
66 return unlikely(value
!= 0 && (value
& SEGMENT_RPL_MASK
) != USER_RPL
);
71 #define FLAG_MASK FLAG_MASK_32
73 static unsigned long *pt_regs_access(struct pt_regs
*regs
, unsigned long regno
)
75 BUILD_BUG_ON(offsetof(struct pt_regs
, bx
) != 0);
79 return ®s
->bx
+ regno
;
82 static u16
get_segment_reg(struct task_struct
*task
, unsigned long offset
)
85 * Returning the value truncates it to 16 bits.
88 if (offset
!= offsetof(struct user_regs_struct
, gs
))
89 retval
= *pt_regs_access(task_pt_regs(task
), offset
);
91 retval
= task
->thread
.gs
;
93 savesegment(gs
, retval
);
98 static int set_segment_reg(struct task_struct
*task
,
99 unsigned long offset
, u16 value
)
102 * The value argument was already truncated to 16 bits.
104 if (invalid_selector(value
))
108 * For %cs and %ss we cannot permit a null selector.
109 * We can permit a bogus selector as long as it has USER_RPL.
110 * Null selectors are fine for other segment registers, but
111 * we will never get back to user mode with invalid %cs or %ss
112 * and will take the trap in iret instead. Much code relies
113 * on user_mode() to distinguish a user trap frame (which can
114 * safely use invalid selectors) from a kernel trap frame.
117 case offsetof(struct user_regs_struct
, cs
):
118 case offsetof(struct user_regs_struct
, ss
):
119 if (unlikely(value
== 0))
123 *pt_regs_access(task_pt_regs(task
), offset
) = value
;
126 case offsetof(struct user_regs_struct
, gs
):
127 task
->thread
.gs
= value
;
130 * The user-mode %gs is not affected by
131 * kernel entry, so we must update the CPU.
133 loadsegment(gs
, value
);
139 static unsigned long debugreg_addr_limit(struct task_struct
*task
)
141 return TASK_SIZE
- 3;
144 #else /* CONFIG_X86_64 */
146 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
148 static unsigned long *pt_regs_access(struct pt_regs
*regs
, unsigned long offset
)
150 BUILD_BUG_ON(offsetof(struct pt_regs
, r15
) != 0);
151 return ®s
->r15
+ (offset
/ sizeof(regs
->r15
));
154 static u16
get_segment_reg(struct task_struct
*task
, unsigned long offset
)
157 * Returning the value truncates it to 16 bits.
162 case offsetof(struct user_regs_struct
, fs
):
163 if (task
== current
) {
164 /* Older gas can't assemble movq %?s,%r?? */
165 asm("movl %%fs,%0" : "=r" (seg
));
168 return task
->thread
.fsindex
;
169 case offsetof(struct user_regs_struct
, gs
):
170 if (task
== current
) {
171 asm("movl %%gs,%0" : "=r" (seg
));
174 return task
->thread
.gsindex
;
175 case offsetof(struct user_regs_struct
, ds
):
176 if (task
== current
) {
177 asm("movl %%ds,%0" : "=r" (seg
));
180 return task
->thread
.ds
;
181 case offsetof(struct user_regs_struct
, es
):
182 if (task
== current
) {
183 asm("movl %%es,%0" : "=r" (seg
));
186 return task
->thread
.es
;
188 case offsetof(struct user_regs_struct
, cs
):
189 case offsetof(struct user_regs_struct
, ss
):
192 return *pt_regs_access(task_pt_regs(task
), offset
);
195 static int set_segment_reg(struct task_struct
*task
,
196 unsigned long offset
, u16 value
)
199 * The value argument was already truncated to 16 bits.
201 if (invalid_selector(value
))
205 case offsetof(struct user_regs_struct
,fs
):
207 * If this is setting fs as for normal 64-bit use but
208 * setting fs_base has implicitly changed it, leave it.
210 if ((value
== FS_TLS_SEL
&& task
->thread
.fsindex
== 0 &&
211 task
->thread
.fs
!= 0) ||
212 (value
== 0 && task
->thread
.fsindex
== FS_TLS_SEL
&&
213 task
->thread
.fs
== 0))
215 task
->thread
.fsindex
= value
;
217 loadsegment(fs
, task
->thread
.fsindex
);
219 case offsetof(struct user_regs_struct
,gs
):
221 * If this is setting gs as for normal 64-bit use but
222 * setting gs_base has implicitly changed it, leave it.
224 if ((value
== GS_TLS_SEL
&& task
->thread
.gsindex
== 0 &&
225 task
->thread
.gs
!= 0) ||
226 (value
== 0 && task
->thread
.gsindex
== GS_TLS_SEL
&&
227 task
->thread
.gs
== 0))
229 task
->thread
.gsindex
= value
;
231 load_gs_index(task
->thread
.gsindex
);
233 case offsetof(struct user_regs_struct
,ds
):
234 task
->thread
.ds
= value
;
236 loadsegment(ds
, task
->thread
.ds
);
238 case offsetof(struct user_regs_struct
,es
):
239 task
->thread
.es
= value
;
241 loadsegment(es
, task
->thread
.es
);
245 * Can't actually change these in 64-bit mode.
247 case offsetof(struct user_regs_struct
,cs
):
248 if (unlikely(value
== 0))
250 #ifdef CONFIG_IA32_EMULATION
251 if (test_tsk_thread_flag(task
, TIF_IA32
))
252 task_pt_regs(task
)->cs
= value
;
255 case offsetof(struct user_regs_struct
,ss
):
256 if (unlikely(value
== 0))
258 #ifdef CONFIG_IA32_EMULATION
259 if (test_tsk_thread_flag(task
, TIF_IA32
))
260 task_pt_regs(task
)->ss
= value
;
268 static unsigned long debugreg_addr_limit(struct task_struct
*task
)
270 #ifdef CONFIG_IA32_EMULATION
271 if (test_tsk_thread_flag(task
, TIF_IA32
))
272 return IA32_PAGE_OFFSET
- 3;
274 return TASK_SIZE64
- 7;
277 #endif /* CONFIG_X86_32 */
279 static unsigned long get_flags(struct task_struct
*task
)
281 unsigned long retval
= task_pt_regs(task
)->flags
;
284 * If the debugger set TF, hide it from the readout.
286 if (test_tsk_thread_flag(task
, TIF_FORCED_TF
))
287 retval
&= ~X86_EFLAGS_TF
;
292 static int set_flags(struct task_struct
*task
, unsigned long value
)
294 struct pt_regs
*regs
= task_pt_regs(task
);
297 * If the user value contains TF, mark that
298 * it was not "us" (the debugger) that set it.
299 * If not, make sure it stays set if we had.
301 if (value
& X86_EFLAGS_TF
)
302 clear_tsk_thread_flag(task
, TIF_FORCED_TF
);
303 else if (test_tsk_thread_flag(task
, TIF_FORCED_TF
))
304 value
|= X86_EFLAGS_TF
;
306 regs
->flags
= (regs
->flags
& ~FLAG_MASK
) | (value
& FLAG_MASK
);
311 static int putreg(struct task_struct
*child
,
312 unsigned long offset
, unsigned long value
)
315 case offsetof(struct user_regs_struct
, cs
):
316 case offsetof(struct user_regs_struct
, ds
):
317 case offsetof(struct user_regs_struct
, es
):
318 case offsetof(struct user_regs_struct
, fs
):
319 case offsetof(struct user_regs_struct
, gs
):
320 case offsetof(struct user_regs_struct
, ss
):
321 return set_segment_reg(child
, offset
, value
);
323 case offsetof(struct user_regs_struct
, flags
):
324 return set_flags(child
, value
);
328 * Orig_ax is really just a flag with small positive and
329 * negative values, so make sure to always sign-extend it
330 * from 32 bits so that it works correctly regardless of
331 * whether we come from a 32-bit environment or not.
333 case offsetof(struct user_regs_struct
, orig_ax
):
334 value
= (long) (s32
) value
;
337 case offsetof(struct user_regs_struct
,fs_base
):
338 if (value
>= TASK_SIZE_OF(child
))
341 * When changing the segment base, use do_arch_prctl
342 * to set either thread.fs or thread.fsindex and the
343 * corresponding GDT slot.
345 if (child
->thread
.fs
!= value
)
346 return do_arch_prctl(child
, ARCH_SET_FS
, value
);
348 case offsetof(struct user_regs_struct
,gs_base
):
350 * Exactly the same here as the %fs handling above.
352 if (value
>= TASK_SIZE_OF(child
))
354 if (child
->thread
.gs
!= value
)
355 return do_arch_prctl(child
, ARCH_SET_GS
, value
);
360 *pt_regs_access(task_pt_regs(child
), offset
) = value
;
364 static unsigned long getreg(struct task_struct
*task
, unsigned long offset
)
367 case offsetof(struct user_regs_struct
, cs
):
368 case offsetof(struct user_regs_struct
, ds
):
369 case offsetof(struct user_regs_struct
, es
):
370 case offsetof(struct user_regs_struct
, fs
):
371 case offsetof(struct user_regs_struct
, gs
):
372 case offsetof(struct user_regs_struct
, ss
):
373 return get_segment_reg(task
, offset
);
375 case offsetof(struct user_regs_struct
, flags
):
376 return get_flags(task
);
379 case offsetof(struct user_regs_struct
, fs_base
): {
381 * do_arch_prctl may have used a GDT slot instead of
382 * the MSR. To userland, it appears the same either
383 * way, except the %fs segment selector might not be 0.
385 unsigned int seg
= task
->thread
.fsindex
;
386 if (task
->thread
.fs
!= 0)
387 return task
->thread
.fs
;
389 asm("movl %%fs,%0" : "=r" (seg
));
390 if (seg
!= FS_TLS_SEL
)
392 return get_desc_base(&task
->thread
.tls_array
[FS_TLS
]);
394 case offsetof(struct user_regs_struct
, gs_base
): {
396 * Exactly the same here as the %fs handling above.
398 unsigned int seg
= task
->thread
.gsindex
;
399 if (task
->thread
.gs
!= 0)
400 return task
->thread
.gs
;
402 asm("movl %%gs,%0" : "=r" (seg
));
403 if (seg
!= GS_TLS_SEL
)
405 return get_desc_base(&task
->thread
.tls_array
[GS_TLS
]);
410 return *pt_regs_access(task_pt_regs(task
), offset
);
413 static int genregs_get(struct task_struct
*target
,
414 const struct user_regset
*regset
,
415 unsigned int pos
, unsigned int count
,
416 void *kbuf
, void __user
*ubuf
)
419 unsigned long *k
= kbuf
;
421 *k
++ = getreg(target
, pos
);
426 unsigned long __user
*u
= ubuf
;
428 if (__put_user(getreg(target
, pos
), u
++))
438 static int genregs_set(struct task_struct
*target
,
439 const struct user_regset
*regset
,
440 unsigned int pos
, unsigned int count
,
441 const void *kbuf
, const void __user
*ubuf
)
445 const unsigned long *k
= kbuf
;
446 while (count
> 0 && !ret
) {
447 ret
= putreg(target
, pos
, *k
++);
452 const unsigned long __user
*u
= ubuf
;
453 while (count
> 0 && !ret
) {
455 ret
= __get_user(word
, u
++);
458 ret
= putreg(target
, pos
, word
);
467 * This function is trivial and will be inlined by the compiler.
468 * Having it separates the implementation details of debug
469 * registers from the interface details of ptrace.
471 static unsigned long ptrace_get_debugreg(struct task_struct
*child
, int n
)
474 case 0: return child
->thread
.debugreg0
;
475 case 1: return child
->thread
.debugreg1
;
476 case 2: return child
->thread
.debugreg2
;
477 case 3: return child
->thread
.debugreg3
;
478 case 6: return child
->thread
.debugreg6
;
479 case 7: return child
->thread
.debugreg7
;
484 static int ptrace_set_debugreg(struct task_struct
*child
,
485 int n
, unsigned long data
)
489 if (unlikely(n
== 4 || n
== 5))
492 if (n
< 4 && unlikely(data
>= debugreg_addr_limit(child
)))
496 case 0: child
->thread
.debugreg0
= data
; break;
497 case 1: child
->thread
.debugreg1
= data
; break;
498 case 2: child
->thread
.debugreg2
= data
; break;
499 case 3: child
->thread
.debugreg3
= data
; break;
502 if ((data
& ~0xffffffffUL
) != 0)
504 child
->thread
.debugreg6
= data
;
509 * Sanity-check data. Take one half-byte at once with
510 * check = (val >> (16 + 4*i)) & 0xf. It contains the
511 * R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits
512 * 2 and 3 are LENi. Given a list of invalid values,
513 * we do mask |= 1 << invalid_value, so that
514 * (mask >> check) & 1 is a correct test for invalid
517 * R/Wi contains the type of the breakpoint /
518 * watchpoint, LENi contains the length of the watched
519 * data in the watchpoint case.
521 * The invalid values are:
522 * - LENi == 0x10 (undefined), so mask |= 0x0f00. [32-bit]
523 * - R/Wi == 0x10 (break on I/O reads or writes), so
525 * - R/Wi == 0x00 && LENi != 0x00, so we have mask |=
528 * Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54.
530 * See the Intel Manual "System Programming Guide",
533 * Note that LENi == 0x10 is defined on x86_64 in long
534 * mode (i.e. even for 32-bit userspace software, but
535 * 64-bit kernel), so the x86_64 mask value is 0x5454.
536 * See the AMD manual no. 24593 (AMD64 System Programming)
539 #define DR7_MASK 0x5f54
541 #define DR7_MASK 0x5554
543 data
&= ~DR_CONTROL_RESERVED
;
544 for (i
= 0; i
< 4; i
++)
545 if ((DR7_MASK
>> ((data
>> (16 + 4*i
)) & 0xf)) & 1)
547 child
->thread
.debugreg7
= data
;
549 set_tsk_thread_flag(child
, TIF_DEBUG
);
551 clear_tsk_thread_flag(child
, TIF_DEBUG
);
560 static int ptrace_bts_get_size(struct task_struct
*child
)
562 if (!child
->thread
.ds_area_msr
)
565 return ds_get_bts_index((void *)child
->thread
.ds_area_msr
);
568 static int ptrace_bts_read_record(struct task_struct
*child
,
570 struct bts_struct __user
*out
)
572 struct bts_struct ret
;
577 if (!child
->thread
.ds_area_msr
)
583 bts_end
= ds_get_bts_end((void *)child
->thread
.ds_area_msr
);
584 if (bts_end
<= index
)
587 /* translate the ptrace bts index into the ds bts index */
588 bts_index
= ds_get_bts_index((void *)child
->thread
.ds_area_msr
);
589 bts_index
-= (index
+ 1);
591 bts_index
+= bts_end
;
593 retval
= ds_read_bts((void *)child
->thread
.ds_area_msr
,
598 if (copy_to_user(out
, &ret
, sizeof(ret
)))
604 static int ptrace_bts_clear(struct task_struct
*child
)
606 if (!child
->thread
.ds_area_msr
)
609 return ds_clear((void *)child
->thread
.ds_area_msr
);
612 static int ptrace_bts_drain(struct task_struct
*child
,
614 struct bts_struct __user
*out
)
617 void *ds
= (void *)child
->thread
.ds_area_msr
;
622 end
= ds_get_bts_index(ds
);
626 if (size
< (end
* sizeof(struct bts_struct
)))
629 for (i
= 0; i
< end
; i
++, out
++) {
630 struct bts_struct ret
;
633 retval
= ds_read_bts(ds
, i
, &ret
);
637 if (copy_to_user(out
, &ret
, sizeof(ret
)))
646 static int ptrace_bts_config(struct task_struct
*child
,
648 const struct ptrace_bts_config __user
*ucfg
)
650 struct ptrace_bts_config cfg
;
651 int bts_size
, ret
= 0;
654 if (cfg_size
< sizeof(cfg
))
657 if (copy_from_user(&cfg
, ucfg
, sizeof(cfg
)))
660 if ((int)cfg
.size
< 0)
664 ds
= (void *)child
->thread
.ds_area_msr
;
666 bts_size
= ds_get_bts_size(ds
);
670 cfg
.size
= PAGE_ALIGN(cfg
.size
);
672 if (bts_size
!= cfg
.size
) {
673 ret
= ptrace_bts_realloc(child
, cfg
.size
,
674 cfg
.flags
& PTRACE_BTS_O_CUT_SIZE
);
678 ds
= (void *)child
->thread
.ds_area_msr
;
681 if (cfg
.flags
& PTRACE_BTS_O_SIGNAL
)
682 ret
= ds_set_overflow(ds
, DS_O_SIGNAL
);
684 ret
= ds_set_overflow(ds
, DS_O_WRAP
);
688 if (cfg
.flags
& PTRACE_BTS_O_TRACE
)
689 child
->thread
.debugctlmsr
|= ds_debugctl_mask();
691 child
->thread
.debugctlmsr
&= ~ds_debugctl_mask();
693 if (cfg
.flags
& PTRACE_BTS_O_SCHED
)
694 set_tsk_thread_flag(child
, TIF_BTS_TRACE_TS
);
696 clear_tsk_thread_flag(child
, TIF_BTS_TRACE_TS
);
701 if (child
->thread
.debugctlmsr
)
702 set_tsk_thread_flag(child
, TIF_DEBUGCTLMSR
);
704 clear_tsk_thread_flag(child
, TIF_DEBUGCTLMSR
);
709 child
->thread
.debugctlmsr
&= ~ds_debugctl_mask();
710 clear_tsk_thread_flag(child
, TIF_BTS_TRACE_TS
);
714 static int ptrace_bts_status(struct task_struct
*child
,
716 struct ptrace_bts_config __user
*ucfg
)
718 void *ds
= (void *)child
->thread
.ds_area_msr
;
719 struct ptrace_bts_config cfg
;
721 if (cfg_size
< sizeof(cfg
))
724 memset(&cfg
, 0, sizeof(cfg
));
727 cfg
.size
= ds_get_bts_size(ds
);
729 if (ds_get_overflow(ds
) == DS_O_SIGNAL
)
730 cfg
.flags
|= PTRACE_BTS_O_SIGNAL
;
732 if (test_tsk_thread_flag(child
, TIF_DEBUGCTLMSR
) &&
733 child
->thread
.debugctlmsr
& ds_debugctl_mask())
734 cfg
.flags
|= PTRACE_BTS_O_TRACE
;
736 if (test_tsk_thread_flag(child
, TIF_BTS_TRACE_TS
))
737 cfg
.flags
|= PTRACE_BTS_O_SCHED
;
740 cfg
.bts_size
= sizeof(struct bts_struct
);
742 if (copy_to_user(ucfg
, &cfg
, sizeof(cfg
)))
749 static int ptrace_bts_write_record(struct task_struct
*child
,
750 const struct bts_struct
*in
)
754 if (!child
->thread
.ds_area_msr
)
757 retval
= ds_write_bts((void *)child
->thread
.ds_area_msr
, in
);
764 static int ptrace_bts_realloc(struct task_struct
*child
,
765 int size
, int reduce_size
)
767 unsigned long rlim
, vm
;
773 old_size
= ds_get_bts_size((void *)child
->thread
.ds_area_msr
);
777 ret
= ds_free((void **)&child
->thread
.ds_area_msr
);
782 old_size
>>= PAGE_SHIFT
;
784 current
->mm
->total_vm
-= old_size
;
785 current
->mm
->locked_vm
-= old_size
;
790 rlim
= current
->signal
->rlim
[RLIMIT_AS
].rlim_cur
>> PAGE_SHIFT
;
791 vm
= current
->mm
->total_vm
+ size
;
798 size
= rlim
- current
->mm
->total_vm
;
803 rlim
= current
->signal
->rlim
[RLIMIT_MEMLOCK
].rlim_cur
>> PAGE_SHIFT
;
804 vm
= current
->mm
->locked_vm
+ size
;
811 size
= rlim
- current
->mm
->locked_vm
;
816 ret
= ds_allocate((void **)&child
->thread
.ds_area_msr
,
821 current
->mm
->total_vm
+= size
;
822 current
->mm
->locked_vm
+= size
;
825 if (child
->thread
.ds_area_msr
)
826 set_tsk_thread_flag(child
, TIF_DS_AREA_MSR
);
828 clear_tsk_thread_flag(child
, TIF_DS_AREA_MSR
);
833 void ptrace_bts_take_timestamp(struct task_struct
*tsk
,
834 enum bts_qualifier qualifier
)
836 struct bts_struct rec
= {
837 .qualifier
= qualifier
,
838 .variant
.jiffies
= jiffies_64
841 ptrace_bts_write_record(tsk
, &rec
);
846 * Called by kernel/ptrace.c when detaching..
848 * Make sure the single step bit is not set.
850 void ptrace_disable(struct task_struct
*child
)
852 user_disable_single_step(child
);
853 #ifdef TIF_SYSCALL_EMU
854 clear_tsk_thread_flag(child
, TIF_SYSCALL_EMU
);
856 if (child
->thread
.ds_area_msr
) {
858 ptrace_bts_realloc(child
, 0, 0);
860 child
->thread
.debugctlmsr
&= ~ds_debugctl_mask();
861 if (!child
->thread
.debugctlmsr
)
862 clear_tsk_thread_flag(child
, TIF_DEBUGCTLMSR
);
863 clear_tsk_thread_flag(child
, TIF_BTS_TRACE_TS
);
867 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
868 static const struct user_regset_view user_x86_32_view
; /* Initialized below. */
871 long arch_ptrace(struct task_struct
*child
, long request
, long addr
, long data
)
874 unsigned long __user
*datap
= (unsigned long __user
*)data
;
877 /* read the word at location addr in the USER area. */
878 case PTRACE_PEEKUSR
: {
882 if ((addr
& (sizeof(data
) - 1)) || addr
< 0 ||
883 addr
>= sizeof(struct user
))
886 tmp
= 0; /* Default return condition */
887 if (addr
< sizeof(struct user_regs_struct
))
888 tmp
= getreg(child
, addr
);
889 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
890 addr
<= offsetof(struct user
, u_debugreg
[7])) {
891 addr
-= offsetof(struct user
, u_debugreg
[0]);
892 tmp
= ptrace_get_debugreg(child
, addr
/ sizeof(data
));
894 ret
= put_user(tmp
, datap
);
898 case PTRACE_POKEUSR
: /* write the word at location addr in the USER area */
900 if ((addr
& (sizeof(data
) - 1)) || addr
< 0 ||
901 addr
>= sizeof(struct user
))
904 if (addr
< sizeof(struct user_regs_struct
))
905 ret
= putreg(child
, addr
, data
);
906 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
907 addr
<= offsetof(struct user
, u_debugreg
[7])) {
908 addr
-= offsetof(struct user
, u_debugreg
[0]);
909 ret
= ptrace_set_debugreg(child
,
910 addr
/ sizeof(data
), data
);
914 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
915 return copy_regset_to_user(child
,
916 task_user_regset_view(current
),
918 0, sizeof(struct user_regs_struct
),
921 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
922 return copy_regset_from_user(child
,
923 task_user_regset_view(current
),
925 0, sizeof(struct user_regs_struct
),
928 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
929 return copy_regset_to_user(child
,
930 task_user_regset_view(current
),
932 0, sizeof(struct user_i387_struct
),
935 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
936 return copy_regset_from_user(child
,
937 task_user_regset_view(current
),
939 0, sizeof(struct user_i387_struct
),
943 case PTRACE_GETFPXREGS
: /* Get the child extended FPU state. */
944 return copy_regset_to_user(child
, &user_x86_32_view
,
946 0, sizeof(struct user_fxsr_struct
),
949 case PTRACE_SETFPXREGS
: /* Set the child extended FPU state. */
950 return copy_regset_from_user(child
, &user_x86_32_view
,
952 0, sizeof(struct user_fxsr_struct
),
956 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
957 case PTRACE_GET_THREAD_AREA
:
960 ret
= do_get_thread_area(child
, addr
,
961 (struct user_desc __user
*) data
);
964 case PTRACE_SET_THREAD_AREA
:
967 ret
= do_set_thread_area(child
, addr
,
968 (struct user_desc __user
*) data
, 0);
973 /* normal 64bit interface to access TLS data.
974 Works just like arch_prctl, except that the arguments
976 case PTRACE_ARCH_PRCTL
:
977 ret
= do_arch_prctl(child
, data
, addr
);
982 * These bits need more cooking - not enabled yet:
985 case PTRACE_BTS_CONFIG
:
986 ret
= ptrace_bts_config
987 (child
, data
, (struct ptrace_bts_config __user
*)addr
);
990 case PTRACE_BTS_STATUS
:
991 ret
= ptrace_bts_status
992 (child
, data
, (struct ptrace_bts_config __user
*)addr
);
995 case PTRACE_BTS_SIZE
:
996 ret
= ptrace_bts_get_size(child
);
1000 ret
= ptrace_bts_read_record
1001 (child
, data
, (struct bts_struct __user
*) addr
);
1004 case PTRACE_BTS_CLEAR
:
1005 ret
= ptrace_bts_clear(child
);
1008 case PTRACE_BTS_DRAIN
:
1009 ret
= ptrace_bts_drain
1010 (child
, data
, (struct bts_struct __user
*) addr
);
1015 ret
= ptrace_request(child
, request
, addr
, data
);
1022 #ifdef CONFIG_IA32_EMULATION
1024 #include <linux/compat.h>
1025 #include <linux/syscalls.h>
1026 #include <asm/ia32.h>
1027 #include <asm/user32.h>
1030 case offsetof(struct user32, regs.l): \
1031 regs->q = value; break
1034 case offsetof(struct user32, regs.rs): \
1035 return set_segment_reg(child, \
1036 offsetof(struct user_regs_struct, rs), \
1040 static int putreg32(struct task_struct
*child
, unsigned regno
, u32 value
)
1042 struct pt_regs
*regs
= task_pt_regs(child
);
1063 case offsetof(struct user32
, regs
.orig_eax
):
1065 * Sign-extend the value so that orig_eax = -1
1066 * causes (long)orig_ax < 0 tests to fire correctly.
1068 regs
->orig_ax
= (long) (s32
) value
;
1071 case offsetof(struct user32
, regs
.eflags
):
1072 return set_flags(child
, value
);
1074 case offsetof(struct user32
, u_debugreg
[0]) ...
1075 offsetof(struct user32
, u_debugreg
[7]):
1076 regno
-= offsetof(struct user32
, u_debugreg
[0]);
1077 return ptrace_set_debugreg(child
, regno
/ 4, value
);
1080 if (regno
> sizeof(struct user32
) || (regno
& 3))
1084 * Other dummy fields in the virtual user structure
1096 case offsetof(struct user32, regs.l): \
1097 *val = regs->q; break
1100 case offsetof(struct user32, regs.rs): \
1101 *val = get_segment_reg(child, \
1102 offsetof(struct user_regs_struct, rs)); \
1105 static int getreg32(struct task_struct
*child
, unsigned regno
, u32
*val
)
1107 struct pt_regs
*regs
= task_pt_regs(child
);
1125 R32(orig_eax
, orig_ax
);
1129 case offsetof(struct user32
, regs
.eflags
):
1130 *val
= get_flags(child
);
1133 case offsetof(struct user32
, u_debugreg
[0]) ...
1134 offsetof(struct user32
, u_debugreg
[7]):
1135 regno
-= offsetof(struct user32
, u_debugreg
[0]);
1136 *val
= ptrace_get_debugreg(child
, regno
/ 4);
1140 if (regno
> sizeof(struct user32
) || (regno
& 3))
1144 * Other dummy fields in the virtual user structure
1156 static int genregs32_get(struct task_struct
*target
,
1157 const struct user_regset
*regset
,
1158 unsigned int pos
, unsigned int count
,
1159 void *kbuf
, void __user
*ubuf
)
1162 compat_ulong_t
*k
= kbuf
;
1164 getreg32(target
, pos
, k
++);
1165 count
-= sizeof(*k
);
1169 compat_ulong_t __user
*u
= ubuf
;
1171 compat_ulong_t word
;
1172 getreg32(target
, pos
, &word
);
1173 if (__put_user(word
, u
++))
1175 count
-= sizeof(*u
);
1183 static int genregs32_set(struct task_struct
*target
,
1184 const struct user_regset
*regset
,
1185 unsigned int pos
, unsigned int count
,
1186 const void *kbuf
, const void __user
*ubuf
)
1190 const compat_ulong_t
*k
= kbuf
;
1191 while (count
> 0 && !ret
) {
1192 ret
= putreg32(target
, pos
, *k
++);
1193 count
-= sizeof(*k
);
1197 const compat_ulong_t __user
*u
= ubuf
;
1198 while (count
> 0 && !ret
) {
1199 compat_ulong_t word
;
1200 ret
= __get_user(word
, u
++);
1203 ret
= putreg32(target
, pos
, word
);
1204 count
-= sizeof(*u
);
1211 long compat_arch_ptrace(struct task_struct
*child
, compat_long_t request
,
1212 compat_ulong_t caddr
, compat_ulong_t cdata
)
1214 unsigned long addr
= caddr
;
1215 unsigned long data
= cdata
;
1216 void __user
*datap
= compat_ptr(data
);
1221 case PTRACE_PEEKUSR
:
1222 ret
= getreg32(child
, addr
, &val
);
1224 ret
= put_user(val
, (__u32 __user
*)datap
);
1227 case PTRACE_POKEUSR
:
1228 ret
= putreg32(child
, addr
, data
);
1231 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
1232 return copy_regset_to_user(child
, &user_x86_32_view
,
1234 0, sizeof(struct user_regs_struct32
),
1237 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
1238 return copy_regset_from_user(child
, &user_x86_32_view
,
1240 sizeof(struct user_regs_struct32
),
1243 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
1244 return copy_regset_to_user(child
, &user_x86_32_view
,
1246 sizeof(struct user_i387_ia32_struct
),
1249 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
1250 return copy_regset_from_user(
1251 child
, &user_x86_32_view
, REGSET_FP
,
1252 0, sizeof(struct user_i387_ia32_struct
), datap
);
1254 case PTRACE_GETFPXREGS
: /* Get the child extended FPU state. */
1255 return copy_regset_to_user(child
, &user_x86_32_view
,
1257 sizeof(struct user32_fxsr_struct
),
1260 case PTRACE_SETFPXREGS
: /* Set the child extended FPU state. */
1261 return copy_regset_from_user(child
, &user_x86_32_view
,
1263 sizeof(struct user32_fxsr_struct
),
1266 case PTRACE_GET_THREAD_AREA
:
1267 case PTRACE_SET_THREAD_AREA
:
1268 return arch_ptrace(child
, request
, addr
, data
);
1271 return compat_ptrace_request(child
, request
, addr
, data
);
1277 #endif /* CONFIG_IA32_EMULATION */
1279 #ifdef CONFIG_X86_64
1281 static const struct user_regset x86_64_regsets
[] = {
1282 [REGSET_GENERAL
] = {
1283 .core_note_type
= NT_PRSTATUS
,
1284 .n
= sizeof(struct user_regs_struct
) / sizeof(long),
1285 .size
= sizeof(long), .align
= sizeof(long),
1286 .get
= genregs_get
, .set
= genregs_set
1289 .core_note_type
= NT_PRFPREG
,
1290 .n
= sizeof(struct user_i387_struct
) / sizeof(long),
1291 .size
= sizeof(long), .align
= sizeof(long),
1292 .active
= xfpregs_active
, .get
= xfpregs_get
, .set
= xfpregs_set
1296 static const struct user_regset_view user_x86_64_view
= {
1297 .name
= "x86_64", .e_machine
= EM_X86_64
,
1298 .regsets
= x86_64_regsets
, .n
= ARRAY_SIZE(x86_64_regsets
)
1301 #else /* CONFIG_X86_32 */
1303 #define user_regs_struct32 user_regs_struct
1304 #define genregs32_get genregs_get
1305 #define genregs32_set genregs_set
1307 #define user_i387_ia32_struct user_i387_struct
1308 #define user32_fxsr_struct user_fxsr_struct
1310 #endif /* CONFIG_X86_64 */
1312 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1313 static const struct user_regset x86_32_regsets
[] = {
1314 [REGSET_GENERAL
] = {
1315 .core_note_type
= NT_PRSTATUS
,
1316 .n
= sizeof(struct user_regs_struct32
) / sizeof(u32
),
1317 .size
= sizeof(u32
), .align
= sizeof(u32
),
1318 .get
= genregs32_get
, .set
= genregs32_set
1321 .core_note_type
= NT_PRFPREG
,
1322 .n
= sizeof(struct user_i387_ia32_struct
) / sizeof(u32
),
1323 .size
= sizeof(u32
), .align
= sizeof(u32
),
1324 .active
= fpregs_active
, .get
= fpregs_get
, .set
= fpregs_set
1327 .core_note_type
= NT_PRXFPREG
,
1328 .n
= sizeof(struct user32_fxsr_struct
) / sizeof(u32
),
1329 .size
= sizeof(u32
), .align
= sizeof(u32
),
1330 .active
= xfpregs_active
, .get
= xfpregs_get
, .set
= xfpregs_set
1333 .core_note_type
= NT_386_TLS
,
1334 .n
= GDT_ENTRY_TLS_ENTRIES
, .bias
= GDT_ENTRY_TLS_MIN
,
1335 .size
= sizeof(struct user_desc
),
1336 .align
= sizeof(struct user_desc
),
1337 .active
= regset_tls_active
,
1338 .get
= regset_tls_get
, .set
= regset_tls_set
1342 static const struct user_regset_view user_x86_32_view
= {
1343 .name
= "i386", .e_machine
= EM_386
,
1344 .regsets
= x86_32_regsets
, .n
= ARRAY_SIZE(x86_32_regsets
)
1348 const struct user_regset_view
*task_user_regset_view(struct task_struct
*task
)
1350 #ifdef CONFIG_IA32_EMULATION
1351 if (test_tsk_thread_flag(task
, TIF_IA32
))
1353 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1354 return &user_x86_32_view
;
1356 #ifdef CONFIG_X86_64
1357 return &user_x86_64_view
;
1361 void send_sigtrap(struct task_struct
*tsk
, struct pt_regs
*regs
,
1362 int error_code
, int si_code
)
1364 struct siginfo info
;
1366 tsk
->thread
.trap_no
= 1;
1367 tsk
->thread
.error_code
= error_code
;
1369 memset(&info
, 0, sizeof(info
));
1370 info
.si_signo
= SIGTRAP
;
1371 info
.si_code
= si_code
;
1374 info
.si_addr
= user_mode_vm(regs
) ? (void __user
*) regs
->ip
: NULL
;
1376 /* Send us the fake SIGTRAP */
1377 force_sig_info(SIGTRAP
, &info
, tsk
);
1381 #ifdef CONFIG_X86_32
1383 #elif defined CONFIG_IA32_EMULATION
1384 # define IS_IA32 test_thread_flag(TIF_IA32)
1390 * We must return the syscall number to actually look up in the table.
1391 * This can be -1L to skip running any syscall at all.
1393 asmregparm
long syscall_trace_enter(struct pt_regs
*regs
)
1398 * If we stepped into a sysenter/syscall insn, it trapped in
1399 * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP.
1400 * If user-mode had set TF itself, then it's still clear from
1401 * do_debug() and we need to set it again to restore the user
1402 * state. If we entered on the slow path, TF was already set.
1404 if (test_thread_flag(TIF_SINGLESTEP
))
1405 regs
->flags
|= X86_EFLAGS_TF
;
1407 /* do the secure computing check first */
1408 secure_computing(regs
->orig_ax
);
1410 if (unlikely(test_thread_flag(TIF_SYSCALL_EMU
)))
1413 if ((ret
|| test_thread_flag(TIF_SYSCALL_TRACE
)) &&
1414 tracehook_report_syscall_entry(regs
))
1417 if (unlikely(current
->audit_context
)) {
1419 audit_syscall_entry(AUDIT_ARCH_I386
,
1422 regs
->dx
, regs
->si
);
1423 #ifdef CONFIG_X86_64
1425 audit_syscall_entry(AUDIT_ARCH_X86_64
,
1428 regs
->dx
, regs
->r10
);
1432 return ret
?: regs
->orig_ax
;
1435 asmregparm
void syscall_trace_leave(struct pt_regs
*regs
)
1437 if (unlikely(current
->audit_context
))
1438 audit_syscall_exit(AUDITSC_RESULT(regs
->ax
), regs
->ax
);
1440 if (test_thread_flag(TIF_SYSCALL_TRACE
))
1441 tracehook_report_syscall_exit(regs
, 0);
1444 * If TIF_SYSCALL_EMU is set, we only get here because of
1445 * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP).
1446 * We already reported this syscall instruction in
1447 * syscall_trace_enter(), so don't do any more now.
1449 if (unlikely(test_thread_flag(TIF_SYSCALL_EMU
)))
1453 * If we are single-stepping, synthesize a trap to follow the
1454 * system call instruction.
1456 if (test_thread_flag(TIF_SINGLESTEP
) &&
1457 tracehook_consider_fatal_signal(current
, SIGTRAP
, SIG_DFL
))
1458 send_sigtrap(current
, regs
, 0, TRAP_BRKPT
);