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>
43 REGSET_IOPERM64
= REGSET_XFP
,
49 * does not yet catch signals sent when the child dies.
50 * in exit.c or in signal.c.
54 * Determines which flags the user has access to [1 = access, 0 = no access].
56 #define FLAG_MASK_32 ((unsigned long) \
57 (X86_EFLAGS_CF | X86_EFLAGS_PF | \
58 X86_EFLAGS_AF | X86_EFLAGS_ZF | \
59 X86_EFLAGS_SF | X86_EFLAGS_TF | \
60 X86_EFLAGS_DF | X86_EFLAGS_OF | \
61 X86_EFLAGS_RF | X86_EFLAGS_AC))
64 * Determines whether a value may be installed in a segment register.
66 static inline bool invalid_selector(u16 value
)
68 return unlikely(value
!= 0 && (value
& SEGMENT_RPL_MASK
) != USER_RPL
);
73 #define FLAG_MASK FLAG_MASK_32
75 static unsigned long *pt_regs_access(struct pt_regs
*regs
, unsigned long regno
)
77 BUILD_BUG_ON(offsetof(struct pt_regs
, bx
) != 0);
81 return ®s
->bx
+ regno
;
84 static u16
get_segment_reg(struct task_struct
*task
, unsigned long offset
)
87 * Returning the value truncates it to 16 bits.
90 if (offset
!= offsetof(struct user_regs_struct
, gs
))
91 retval
= *pt_regs_access(task_pt_regs(task
), offset
);
93 retval
= task
->thread
.gs
;
95 savesegment(gs
, retval
);
100 static int set_segment_reg(struct task_struct
*task
,
101 unsigned long offset
, u16 value
)
104 * The value argument was already truncated to 16 bits.
106 if (invalid_selector(value
))
110 * For %cs and %ss we cannot permit a null selector.
111 * We can permit a bogus selector as long as it has USER_RPL.
112 * Null selectors are fine for other segment registers, but
113 * we will never get back to user mode with invalid %cs or %ss
114 * and will take the trap in iret instead. Much code relies
115 * on user_mode() to distinguish a user trap frame (which can
116 * safely use invalid selectors) from a kernel trap frame.
119 case offsetof(struct user_regs_struct
, cs
):
120 case offsetof(struct user_regs_struct
, ss
):
121 if (unlikely(value
== 0))
125 *pt_regs_access(task_pt_regs(task
), offset
) = value
;
128 case offsetof(struct user_regs_struct
, gs
):
129 task
->thread
.gs
= value
;
132 * The user-mode %gs is not affected by
133 * kernel entry, so we must update the CPU.
135 loadsegment(gs
, value
);
141 static unsigned long debugreg_addr_limit(struct task_struct
*task
)
143 return TASK_SIZE
- 3;
146 #else /* CONFIG_X86_64 */
148 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
150 static unsigned long *pt_regs_access(struct pt_regs
*regs
, unsigned long offset
)
152 BUILD_BUG_ON(offsetof(struct pt_regs
, r15
) != 0);
153 return ®s
->r15
+ (offset
/ sizeof(regs
->r15
));
156 static u16
get_segment_reg(struct task_struct
*task
, unsigned long offset
)
159 * Returning the value truncates it to 16 bits.
164 case offsetof(struct user_regs_struct
, fs
):
165 if (task
== current
) {
166 /* Older gas can't assemble movq %?s,%r?? */
167 asm("movl %%fs,%0" : "=r" (seg
));
170 return task
->thread
.fsindex
;
171 case offsetof(struct user_regs_struct
, gs
):
172 if (task
== current
) {
173 asm("movl %%gs,%0" : "=r" (seg
));
176 return task
->thread
.gsindex
;
177 case offsetof(struct user_regs_struct
, ds
):
178 if (task
== current
) {
179 asm("movl %%ds,%0" : "=r" (seg
));
182 return task
->thread
.ds
;
183 case offsetof(struct user_regs_struct
, es
):
184 if (task
== current
) {
185 asm("movl %%es,%0" : "=r" (seg
));
188 return task
->thread
.es
;
190 case offsetof(struct user_regs_struct
, cs
):
191 case offsetof(struct user_regs_struct
, ss
):
194 return *pt_regs_access(task_pt_regs(task
), offset
);
197 static int set_segment_reg(struct task_struct
*task
,
198 unsigned long offset
, u16 value
)
201 * The value argument was already truncated to 16 bits.
203 if (invalid_selector(value
))
207 case offsetof(struct user_regs_struct
,fs
):
209 * If this is setting fs as for normal 64-bit use but
210 * setting fs_base has implicitly changed it, leave it.
212 if ((value
== FS_TLS_SEL
&& task
->thread
.fsindex
== 0 &&
213 task
->thread
.fs
!= 0) ||
214 (value
== 0 && task
->thread
.fsindex
== FS_TLS_SEL
&&
215 task
->thread
.fs
== 0))
217 task
->thread
.fsindex
= value
;
219 loadsegment(fs
, task
->thread
.fsindex
);
221 case offsetof(struct user_regs_struct
,gs
):
223 * If this is setting gs as for normal 64-bit use but
224 * setting gs_base has implicitly changed it, leave it.
226 if ((value
== GS_TLS_SEL
&& task
->thread
.gsindex
== 0 &&
227 task
->thread
.gs
!= 0) ||
228 (value
== 0 && task
->thread
.gsindex
== GS_TLS_SEL
&&
229 task
->thread
.gs
== 0))
231 task
->thread
.gsindex
= value
;
233 load_gs_index(task
->thread
.gsindex
);
235 case offsetof(struct user_regs_struct
,ds
):
236 task
->thread
.ds
= value
;
238 loadsegment(ds
, task
->thread
.ds
);
240 case offsetof(struct user_regs_struct
,es
):
241 task
->thread
.es
= value
;
243 loadsegment(es
, task
->thread
.es
);
247 * Can't actually change these in 64-bit mode.
249 case offsetof(struct user_regs_struct
,cs
):
250 if (unlikely(value
== 0))
252 #ifdef CONFIG_IA32_EMULATION
253 if (test_tsk_thread_flag(task
, TIF_IA32
))
254 task_pt_regs(task
)->cs
= value
;
257 case offsetof(struct user_regs_struct
,ss
):
258 if (unlikely(value
== 0))
260 #ifdef CONFIG_IA32_EMULATION
261 if (test_tsk_thread_flag(task
, TIF_IA32
))
262 task_pt_regs(task
)->ss
= value
;
270 static unsigned long debugreg_addr_limit(struct task_struct
*task
)
272 #ifdef CONFIG_IA32_EMULATION
273 if (test_tsk_thread_flag(task
, TIF_IA32
))
274 return IA32_PAGE_OFFSET
- 3;
276 return TASK_SIZE64
- 7;
279 #endif /* CONFIG_X86_32 */
281 static unsigned long get_flags(struct task_struct
*task
)
283 unsigned long retval
= task_pt_regs(task
)->flags
;
286 * If the debugger set TF, hide it from the readout.
288 if (test_tsk_thread_flag(task
, TIF_FORCED_TF
))
289 retval
&= ~X86_EFLAGS_TF
;
294 static int set_flags(struct task_struct
*task
, unsigned long value
)
296 struct pt_regs
*regs
= task_pt_regs(task
);
299 * If the user value contains TF, mark that
300 * it was not "us" (the debugger) that set it.
301 * If not, make sure it stays set if we had.
303 if (value
& X86_EFLAGS_TF
)
304 clear_tsk_thread_flag(task
, TIF_FORCED_TF
);
305 else if (test_tsk_thread_flag(task
, TIF_FORCED_TF
))
306 value
|= X86_EFLAGS_TF
;
308 regs
->flags
= (regs
->flags
& ~FLAG_MASK
) | (value
& FLAG_MASK
);
313 static int putreg(struct task_struct
*child
,
314 unsigned long offset
, unsigned long value
)
317 case offsetof(struct user_regs_struct
, cs
):
318 case offsetof(struct user_regs_struct
, ds
):
319 case offsetof(struct user_regs_struct
, es
):
320 case offsetof(struct user_regs_struct
, fs
):
321 case offsetof(struct user_regs_struct
, gs
):
322 case offsetof(struct user_regs_struct
, ss
):
323 return set_segment_reg(child
, offset
, value
);
325 case offsetof(struct user_regs_struct
, flags
):
326 return set_flags(child
, value
);
330 * Orig_ax is really just a flag with small positive and
331 * negative values, so make sure to always sign-extend it
332 * from 32 bits so that it works correctly regardless of
333 * whether we come from a 32-bit environment or not.
335 case offsetof(struct user_regs_struct
, orig_ax
):
336 value
= (long) (s32
) value
;
339 case offsetof(struct user_regs_struct
,fs_base
):
340 if (value
>= TASK_SIZE_OF(child
))
343 * When changing the segment base, use do_arch_prctl
344 * to set either thread.fs or thread.fsindex and the
345 * corresponding GDT slot.
347 if (child
->thread
.fs
!= value
)
348 return do_arch_prctl(child
, ARCH_SET_FS
, value
);
350 case offsetof(struct user_regs_struct
,gs_base
):
352 * Exactly the same here as the %fs handling above.
354 if (value
>= TASK_SIZE_OF(child
))
356 if (child
->thread
.gs
!= value
)
357 return do_arch_prctl(child
, ARCH_SET_GS
, value
);
362 *pt_regs_access(task_pt_regs(child
), offset
) = value
;
366 static unsigned long getreg(struct task_struct
*task
, unsigned long offset
)
369 case offsetof(struct user_regs_struct
, cs
):
370 case offsetof(struct user_regs_struct
, ds
):
371 case offsetof(struct user_regs_struct
, es
):
372 case offsetof(struct user_regs_struct
, fs
):
373 case offsetof(struct user_regs_struct
, gs
):
374 case offsetof(struct user_regs_struct
, ss
):
375 return get_segment_reg(task
, offset
);
377 case offsetof(struct user_regs_struct
, flags
):
378 return get_flags(task
);
381 case offsetof(struct user_regs_struct
, fs_base
): {
383 * do_arch_prctl may have used a GDT slot instead of
384 * the MSR. To userland, it appears the same either
385 * way, except the %fs segment selector might not be 0.
387 unsigned int seg
= task
->thread
.fsindex
;
388 if (task
->thread
.fs
!= 0)
389 return task
->thread
.fs
;
391 asm("movl %%fs,%0" : "=r" (seg
));
392 if (seg
!= FS_TLS_SEL
)
394 return get_desc_base(&task
->thread
.tls_array
[FS_TLS
]);
396 case offsetof(struct user_regs_struct
, gs_base
): {
398 * Exactly the same here as the %fs handling above.
400 unsigned int seg
= task
->thread
.gsindex
;
401 if (task
->thread
.gs
!= 0)
402 return task
->thread
.gs
;
404 asm("movl %%gs,%0" : "=r" (seg
));
405 if (seg
!= GS_TLS_SEL
)
407 return get_desc_base(&task
->thread
.tls_array
[GS_TLS
]);
412 return *pt_regs_access(task_pt_regs(task
), offset
);
415 static int genregs_get(struct task_struct
*target
,
416 const struct user_regset
*regset
,
417 unsigned int pos
, unsigned int count
,
418 void *kbuf
, void __user
*ubuf
)
421 unsigned long *k
= kbuf
;
423 *k
++ = getreg(target
, pos
);
428 unsigned long __user
*u
= ubuf
;
430 if (__put_user(getreg(target
, pos
), u
++))
440 static int genregs_set(struct task_struct
*target
,
441 const struct user_regset
*regset
,
442 unsigned int pos
, unsigned int count
,
443 const void *kbuf
, const void __user
*ubuf
)
447 const unsigned long *k
= kbuf
;
448 while (count
> 0 && !ret
) {
449 ret
= putreg(target
, pos
, *k
++);
454 const unsigned long __user
*u
= ubuf
;
455 while (count
> 0 && !ret
) {
457 ret
= __get_user(word
, u
++);
460 ret
= putreg(target
, pos
, word
);
469 * This function is trivial and will be inlined by the compiler.
470 * Having it separates the implementation details of debug
471 * registers from the interface details of ptrace.
473 static unsigned long ptrace_get_debugreg(struct task_struct
*child
, int n
)
476 case 0: return child
->thread
.debugreg0
;
477 case 1: return child
->thread
.debugreg1
;
478 case 2: return child
->thread
.debugreg2
;
479 case 3: return child
->thread
.debugreg3
;
480 case 6: return child
->thread
.debugreg6
;
481 case 7: return child
->thread
.debugreg7
;
486 static int ptrace_set_debugreg(struct task_struct
*child
,
487 int n
, unsigned long data
)
491 if (unlikely(n
== 4 || n
== 5))
494 if (n
< 4 && unlikely(data
>= debugreg_addr_limit(child
)))
498 case 0: child
->thread
.debugreg0
= data
; break;
499 case 1: child
->thread
.debugreg1
= data
; break;
500 case 2: child
->thread
.debugreg2
= data
; break;
501 case 3: child
->thread
.debugreg3
= data
; break;
504 if ((data
& ~0xffffffffUL
) != 0)
506 child
->thread
.debugreg6
= data
;
511 * Sanity-check data. Take one half-byte at once with
512 * check = (val >> (16 + 4*i)) & 0xf. It contains the
513 * R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits
514 * 2 and 3 are LENi. Given a list of invalid values,
515 * we do mask |= 1 << invalid_value, so that
516 * (mask >> check) & 1 is a correct test for invalid
519 * R/Wi contains the type of the breakpoint /
520 * watchpoint, LENi contains the length of the watched
521 * data in the watchpoint case.
523 * The invalid values are:
524 * - LENi == 0x10 (undefined), so mask |= 0x0f00. [32-bit]
525 * - R/Wi == 0x10 (break on I/O reads or writes), so
527 * - R/Wi == 0x00 && LENi != 0x00, so we have mask |=
530 * Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54.
532 * See the Intel Manual "System Programming Guide",
535 * Note that LENi == 0x10 is defined on x86_64 in long
536 * mode (i.e. even for 32-bit userspace software, but
537 * 64-bit kernel), so the x86_64 mask value is 0x5454.
538 * See the AMD manual no. 24593 (AMD64 System Programming)
541 #define DR7_MASK 0x5f54
543 #define DR7_MASK 0x5554
545 data
&= ~DR_CONTROL_RESERVED
;
546 for (i
= 0; i
< 4; i
++)
547 if ((DR7_MASK
>> ((data
>> (16 + 4*i
)) & 0xf)) & 1)
549 child
->thread
.debugreg7
= data
;
551 set_tsk_thread_flag(child
, TIF_DEBUG
);
553 clear_tsk_thread_flag(child
, TIF_DEBUG
);
561 * These access the current or another (stopped) task's io permission
562 * bitmap for debugging or core dump.
564 static int ioperm_active(struct task_struct
*target
,
565 const struct user_regset
*regset
)
567 return target
->thread
.io_bitmap_max
/ regset
->size
;
570 static int ioperm_get(struct task_struct
*target
,
571 const struct user_regset
*regset
,
572 unsigned int pos
, unsigned int count
,
573 void *kbuf
, void __user
*ubuf
)
575 if (!target
->thread
.io_bitmap_ptr
)
578 return user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
,
579 target
->thread
.io_bitmap_ptr
,
583 #ifdef CONFIG_X86_PTRACE_BTS
584 static int ptrace_bts_read_record(struct task_struct
*child
, size_t index
,
585 struct bts_struct __user
*out
)
587 const struct bts_trace
*trace
;
588 struct bts_struct bts
;
589 const unsigned char *at
;
592 trace
= ds_read_bts(child
->bts
);
596 at
= trace
->ds
.top
- ((index
+ 1) * trace
->ds
.size
);
597 if ((void *)at
< trace
->ds
.begin
)
598 at
+= (trace
->ds
.n
* trace
->ds
.size
);
603 error
= trace
->read(child
->bts
, at
, &bts
);
607 if (copy_to_user(out
, &bts
, sizeof(bts
)))
613 static int ptrace_bts_drain(struct task_struct
*child
,
615 struct bts_struct __user
*out
)
617 const struct bts_trace
*trace
;
618 const unsigned char *at
;
619 int error
, drained
= 0;
621 trace
= ds_read_bts(child
->bts
);
628 if (size
< (trace
->ds
.top
- trace
->ds
.begin
))
631 for (at
= trace
->ds
.begin
; (void *)at
< trace
->ds
.top
;
632 out
++, drained
++, at
+= trace
->ds
.size
) {
633 struct bts_struct bts
;
636 error
= trace
->read(child
->bts
, at
, &bts
);
640 if (copy_to_user(out
, &bts
, sizeof(bts
)))
644 memset(trace
->ds
.begin
, 0, trace
->ds
.n
* trace
->ds
.size
);
646 error
= ds_reset_bts(child
->bts
);
653 static int ptrace_bts_allocate_buffer(struct task_struct
*child
, size_t size
)
655 child
->bts_buffer
= alloc_locked_buffer(size
);
656 if (!child
->bts_buffer
)
659 child
->bts_size
= size
;
664 static void ptrace_bts_free_buffer(struct task_struct
*child
)
666 free_locked_buffer(child
->bts_buffer
, child
->bts_size
);
667 child
->bts_buffer
= NULL
;
671 static int ptrace_bts_config(struct task_struct
*child
,
673 const struct ptrace_bts_config __user
*ucfg
)
675 struct ptrace_bts_config cfg
;
676 unsigned int flags
= 0;
678 if (cfg_size
< sizeof(cfg
))
681 if (copy_from_user(&cfg
, ucfg
, sizeof(cfg
)))
685 ds_release_bts(child
->bts
);
689 if (cfg
.flags
& PTRACE_BTS_O_SIGNAL
) {
695 child
->thread
.bts_ovfl_signal
= cfg
.signal
;
698 if ((cfg
.flags
& PTRACE_BTS_O_ALLOC
) &&
699 (cfg
.size
!= child
->bts_size
)) {
702 ptrace_bts_free_buffer(child
);
704 error
= ptrace_bts_allocate_buffer(child
, cfg
.size
);
709 if (cfg
.flags
& PTRACE_BTS_O_TRACE
)
712 if (cfg
.flags
& PTRACE_BTS_O_SCHED
)
713 flags
|= BTS_TIMESTAMPS
;
715 child
->bts
= ds_request_bts(child
, child
->bts_buffer
, child
->bts_size
,
716 /* ovfl = */ NULL
, /* th = */ (size_t)-1,
718 if (IS_ERR(child
->bts
)) {
719 int error
= PTR_ERR(child
->bts
);
721 ptrace_bts_free_buffer(child
);
730 static int ptrace_bts_status(struct task_struct
*child
,
732 struct ptrace_bts_config __user
*ucfg
)
734 const struct bts_trace
*trace
;
735 struct ptrace_bts_config cfg
;
737 if (cfg_size
< sizeof(cfg
))
740 trace
= ds_read_bts(child
->bts
);
744 memset(&cfg
, 0, sizeof(cfg
));
745 cfg
.size
= trace
->ds
.end
- trace
->ds
.begin
;
746 cfg
.signal
= child
->thread
.bts_ovfl_signal
;
747 cfg
.bts_size
= sizeof(struct bts_struct
);
750 cfg
.flags
|= PTRACE_BTS_O_SIGNAL
;
752 if (trace
->ds
.flags
& BTS_USER
)
753 cfg
.flags
|= PTRACE_BTS_O_TRACE
;
755 if (trace
->ds
.flags
& BTS_TIMESTAMPS
)
756 cfg
.flags
|= PTRACE_BTS_O_SCHED
;
758 if (copy_to_user(ucfg
, &cfg
, sizeof(cfg
)))
764 static int ptrace_bts_clear(struct task_struct
*child
)
766 const struct bts_trace
*trace
;
768 trace
= ds_read_bts(child
->bts
);
772 memset(trace
->ds
.begin
, 0, trace
->ds
.n
* trace
->ds
.size
);
774 return ds_reset_bts(child
->bts
);
777 static int ptrace_bts_size(struct task_struct
*child
)
779 const struct bts_trace
*trace
;
781 trace
= ds_read_bts(child
->bts
);
785 return (trace
->ds
.top
- trace
->ds
.begin
) / trace
->ds
.size
;
788 static void ptrace_bts_fork(struct task_struct
*tsk
)
791 tsk
->bts_buffer
= NULL
;
793 tsk
->thread
.bts_ovfl_signal
= 0;
796 static void ptrace_bts_untrace(struct task_struct
*child
)
798 if (unlikely(child
->bts
)) {
799 ds_release_bts(child
->bts
);
802 /* We cannot update total_vm and locked_vm since
803 child's mm is already gone. But we can reclaim the
805 kfree(child
->bts_buffer
);
806 child
->bts_buffer
= NULL
;
811 static void ptrace_bts_detach(struct task_struct
*child
)
814 * Ptrace_detach() races with ptrace_untrace() in case
815 * the child dies and is reaped by another thread.
817 * We only do the memory accounting at this point and
818 * leave the buffer deallocation and the bts tracer
819 * release to ptrace_bts_untrace() which will be called
820 * later on with tasklist_lock held.
822 release_locked_buffer(child
->bts_buffer
, child
->bts_size
);
825 static inline void ptrace_bts_fork(struct task_struct
*tsk
) {}
826 static inline void ptrace_bts_detach(struct task_struct
*child
) {}
827 static inline void ptrace_bts_untrace(struct task_struct
*child
) {}
828 #endif /* CONFIG_X86_PTRACE_BTS */
830 void x86_ptrace_fork(struct task_struct
*child
, unsigned long clone_flags
)
832 ptrace_bts_fork(child
);
835 void x86_ptrace_untrace(struct task_struct
*child
)
837 ptrace_bts_untrace(child
);
841 * Called by kernel/ptrace.c when detaching..
843 * Make sure the single step bit is not set.
845 void ptrace_disable(struct task_struct
*child
)
847 user_disable_single_step(child
);
848 #ifdef TIF_SYSCALL_EMU
849 clear_tsk_thread_flag(child
, TIF_SYSCALL_EMU
);
851 ptrace_bts_detach(child
);
854 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
855 static const struct user_regset_view user_x86_32_view
; /* Initialized below. */
858 long arch_ptrace(struct task_struct
*child
, long request
, long addr
, long data
)
861 unsigned long __user
*datap
= (unsigned long __user
*)data
;
864 /* read the word at location addr in the USER area. */
865 case PTRACE_PEEKUSR
: {
869 if ((addr
& (sizeof(data
) - 1)) || addr
< 0 ||
870 addr
>= sizeof(struct user
))
873 tmp
= 0; /* Default return condition */
874 if (addr
< sizeof(struct user_regs_struct
))
875 tmp
= getreg(child
, addr
);
876 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
877 addr
<= offsetof(struct user
, u_debugreg
[7])) {
878 addr
-= offsetof(struct user
, u_debugreg
[0]);
879 tmp
= ptrace_get_debugreg(child
, addr
/ sizeof(data
));
881 ret
= put_user(tmp
, datap
);
885 case PTRACE_POKEUSR
: /* write the word at location addr in the USER area */
887 if ((addr
& (sizeof(data
) - 1)) || addr
< 0 ||
888 addr
>= sizeof(struct user
))
891 if (addr
< sizeof(struct user_regs_struct
))
892 ret
= putreg(child
, addr
, data
);
893 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
894 addr
<= offsetof(struct user
, u_debugreg
[7])) {
895 addr
-= offsetof(struct user
, u_debugreg
[0]);
896 ret
= ptrace_set_debugreg(child
,
897 addr
/ sizeof(data
), data
);
901 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
902 return copy_regset_to_user(child
,
903 task_user_regset_view(current
),
905 0, sizeof(struct user_regs_struct
),
908 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
909 return copy_regset_from_user(child
,
910 task_user_regset_view(current
),
912 0, sizeof(struct user_regs_struct
),
915 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
916 return copy_regset_to_user(child
,
917 task_user_regset_view(current
),
919 0, sizeof(struct user_i387_struct
),
922 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
923 return copy_regset_from_user(child
,
924 task_user_regset_view(current
),
926 0, sizeof(struct user_i387_struct
),
930 case PTRACE_GETFPXREGS
: /* Get the child extended FPU state. */
931 return copy_regset_to_user(child
, &user_x86_32_view
,
933 0, sizeof(struct user_fxsr_struct
),
936 case PTRACE_SETFPXREGS
: /* Set the child extended FPU state. */
937 return copy_regset_from_user(child
, &user_x86_32_view
,
939 0, sizeof(struct user_fxsr_struct
),
943 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
944 case PTRACE_GET_THREAD_AREA
:
947 ret
= do_get_thread_area(child
, addr
,
948 (struct user_desc __user
*) data
);
951 case PTRACE_SET_THREAD_AREA
:
954 ret
= do_set_thread_area(child
, addr
,
955 (struct user_desc __user
*) data
, 0);
960 /* normal 64bit interface to access TLS data.
961 Works just like arch_prctl, except that the arguments
963 case PTRACE_ARCH_PRCTL
:
964 ret
= do_arch_prctl(child
, data
, addr
);
969 * These bits need more cooking - not enabled yet:
971 #ifdef CONFIG_X86_PTRACE_BTS
972 case PTRACE_BTS_CONFIG
:
973 ret
= ptrace_bts_config
974 (child
, data
, (struct ptrace_bts_config __user
*)addr
);
977 case PTRACE_BTS_STATUS
:
978 ret
= ptrace_bts_status
979 (child
, data
, (struct ptrace_bts_config __user
*)addr
);
982 case PTRACE_BTS_SIZE
:
983 ret
= ptrace_bts_size(child
);
987 ret
= ptrace_bts_read_record
988 (child
, data
, (struct bts_struct __user
*) addr
);
991 case PTRACE_BTS_CLEAR
:
992 ret
= ptrace_bts_clear(child
);
995 case PTRACE_BTS_DRAIN
:
996 ret
= ptrace_bts_drain
997 (child
, data
, (struct bts_struct __user
*) addr
);
999 #endif /* CONFIG_X86_PTRACE_BTS */
1002 ret
= ptrace_request(child
, request
, addr
, data
);
1009 #ifdef CONFIG_IA32_EMULATION
1011 #include <linux/compat.h>
1012 #include <linux/syscalls.h>
1013 #include <asm/ia32.h>
1014 #include <asm/user32.h>
1017 case offsetof(struct user32, regs.l): \
1018 regs->q = value; break
1021 case offsetof(struct user32, regs.rs): \
1022 return set_segment_reg(child, \
1023 offsetof(struct user_regs_struct, rs), \
1027 static int putreg32(struct task_struct
*child
, unsigned regno
, u32 value
)
1029 struct pt_regs
*regs
= task_pt_regs(child
);
1050 case offsetof(struct user32
, regs
.orig_eax
):
1052 * Sign-extend the value so that orig_eax = -1
1053 * causes (long)orig_ax < 0 tests to fire correctly.
1055 regs
->orig_ax
= (long) (s32
) value
;
1058 case offsetof(struct user32
, regs
.eflags
):
1059 return set_flags(child
, value
);
1061 case offsetof(struct user32
, u_debugreg
[0]) ...
1062 offsetof(struct user32
, u_debugreg
[7]):
1063 regno
-= offsetof(struct user32
, u_debugreg
[0]);
1064 return ptrace_set_debugreg(child
, regno
/ 4, value
);
1067 if (regno
> sizeof(struct user32
) || (regno
& 3))
1071 * Other dummy fields in the virtual user structure
1083 case offsetof(struct user32, regs.l): \
1084 *val = regs->q; break
1087 case offsetof(struct user32, regs.rs): \
1088 *val = get_segment_reg(child, \
1089 offsetof(struct user_regs_struct, rs)); \
1092 static int getreg32(struct task_struct
*child
, unsigned regno
, u32
*val
)
1094 struct pt_regs
*regs
= task_pt_regs(child
);
1112 R32(orig_eax
, orig_ax
);
1116 case offsetof(struct user32
, regs
.eflags
):
1117 *val
= get_flags(child
);
1120 case offsetof(struct user32
, u_debugreg
[0]) ...
1121 offsetof(struct user32
, u_debugreg
[7]):
1122 regno
-= offsetof(struct user32
, u_debugreg
[0]);
1123 *val
= ptrace_get_debugreg(child
, regno
/ 4);
1127 if (regno
> sizeof(struct user32
) || (regno
& 3))
1131 * Other dummy fields in the virtual user structure
1143 static int genregs32_get(struct task_struct
*target
,
1144 const struct user_regset
*regset
,
1145 unsigned int pos
, unsigned int count
,
1146 void *kbuf
, void __user
*ubuf
)
1149 compat_ulong_t
*k
= kbuf
;
1151 getreg32(target
, pos
, k
++);
1152 count
-= sizeof(*k
);
1156 compat_ulong_t __user
*u
= ubuf
;
1158 compat_ulong_t word
;
1159 getreg32(target
, pos
, &word
);
1160 if (__put_user(word
, u
++))
1162 count
-= sizeof(*u
);
1170 static int genregs32_set(struct task_struct
*target
,
1171 const struct user_regset
*regset
,
1172 unsigned int pos
, unsigned int count
,
1173 const void *kbuf
, const void __user
*ubuf
)
1177 const compat_ulong_t
*k
= kbuf
;
1178 while (count
> 0 && !ret
) {
1179 ret
= putreg32(target
, pos
, *k
++);
1180 count
-= sizeof(*k
);
1184 const compat_ulong_t __user
*u
= ubuf
;
1185 while (count
> 0 && !ret
) {
1186 compat_ulong_t word
;
1187 ret
= __get_user(word
, u
++);
1190 ret
= putreg32(target
, pos
, word
);
1191 count
-= sizeof(*u
);
1198 long compat_arch_ptrace(struct task_struct
*child
, compat_long_t request
,
1199 compat_ulong_t caddr
, compat_ulong_t cdata
)
1201 unsigned long addr
= caddr
;
1202 unsigned long data
= cdata
;
1203 void __user
*datap
= compat_ptr(data
);
1208 case PTRACE_PEEKUSR
:
1209 ret
= getreg32(child
, addr
, &val
);
1211 ret
= put_user(val
, (__u32 __user
*)datap
);
1214 case PTRACE_POKEUSR
:
1215 ret
= putreg32(child
, addr
, data
);
1218 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
1219 return copy_regset_to_user(child
, &user_x86_32_view
,
1221 0, sizeof(struct user_regs_struct32
),
1224 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
1225 return copy_regset_from_user(child
, &user_x86_32_view
,
1227 sizeof(struct user_regs_struct32
),
1230 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
1231 return copy_regset_to_user(child
, &user_x86_32_view
,
1233 sizeof(struct user_i387_ia32_struct
),
1236 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
1237 return copy_regset_from_user(
1238 child
, &user_x86_32_view
, REGSET_FP
,
1239 0, sizeof(struct user_i387_ia32_struct
), datap
);
1241 case PTRACE_GETFPXREGS
: /* Get the child extended FPU state. */
1242 return copy_regset_to_user(child
, &user_x86_32_view
,
1244 sizeof(struct user32_fxsr_struct
),
1247 case PTRACE_SETFPXREGS
: /* Set the child extended FPU state. */
1248 return copy_regset_from_user(child
, &user_x86_32_view
,
1250 sizeof(struct user32_fxsr_struct
),
1253 case PTRACE_GET_THREAD_AREA
:
1254 case PTRACE_SET_THREAD_AREA
:
1255 #ifdef CONFIG_X86_PTRACE_BTS
1256 case PTRACE_BTS_CONFIG
:
1257 case PTRACE_BTS_STATUS
:
1258 case PTRACE_BTS_SIZE
:
1259 case PTRACE_BTS_GET
:
1260 case PTRACE_BTS_CLEAR
:
1261 case PTRACE_BTS_DRAIN
:
1262 #endif /* CONFIG_X86_PTRACE_BTS */
1263 return arch_ptrace(child
, request
, addr
, data
);
1266 return compat_ptrace_request(child
, request
, addr
, data
);
1272 #endif /* CONFIG_IA32_EMULATION */
1274 #ifdef CONFIG_X86_64
1276 static const struct user_regset x86_64_regsets
[] = {
1277 [REGSET_GENERAL
] = {
1278 .core_note_type
= NT_PRSTATUS
,
1279 .n
= sizeof(struct user_regs_struct
) / sizeof(long),
1280 .size
= sizeof(long), .align
= sizeof(long),
1281 .get
= genregs_get
, .set
= genregs_set
1284 .core_note_type
= NT_PRFPREG
,
1285 .n
= sizeof(struct user_i387_struct
) / sizeof(long),
1286 .size
= sizeof(long), .align
= sizeof(long),
1287 .active
= xfpregs_active
, .get
= xfpregs_get
, .set
= xfpregs_set
1289 [REGSET_IOPERM64
] = {
1290 .core_note_type
= NT_386_IOPERM
,
1291 .n
= IO_BITMAP_LONGS
,
1292 .size
= sizeof(long), .align
= sizeof(long),
1293 .active
= ioperm_active
, .get
= ioperm_get
1297 static const struct user_regset_view user_x86_64_view
= {
1298 .name
= "x86_64", .e_machine
= EM_X86_64
,
1299 .regsets
= x86_64_regsets
, .n
= ARRAY_SIZE(x86_64_regsets
)
1302 #else /* CONFIG_X86_32 */
1304 #define user_regs_struct32 user_regs_struct
1305 #define genregs32_get genregs_get
1306 #define genregs32_set genregs_set
1308 #define user_i387_ia32_struct user_i387_struct
1309 #define user32_fxsr_struct user_fxsr_struct
1311 #endif /* CONFIG_X86_64 */
1313 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1314 static const struct user_regset x86_32_regsets
[] = {
1315 [REGSET_GENERAL
] = {
1316 .core_note_type
= NT_PRSTATUS
,
1317 .n
= sizeof(struct user_regs_struct32
) / sizeof(u32
),
1318 .size
= sizeof(u32
), .align
= sizeof(u32
),
1319 .get
= genregs32_get
, .set
= genregs32_set
1322 .core_note_type
= NT_PRFPREG
,
1323 .n
= sizeof(struct user_i387_ia32_struct
) / sizeof(u32
),
1324 .size
= sizeof(u32
), .align
= sizeof(u32
),
1325 .active
= fpregs_active
, .get
= fpregs_get
, .set
= fpregs_set
1328 .core_note_type
= NT_PRXFPREG
,
1329 .n
= sizeof(struct user32_fxsr_struct
) / sizeof(u32
),
1330 .size
= sizeof(u32
), .align
= sizeof(u32
),
1331 .active
= xfpregs_active
, .get
= xfpregs_get
, .set
= xfpregs_set
1334 .core_note_type
= NT_386_TLS
,
1335 .n
= GDT_ENTRY_TLS_ENTRIES
, .bias
= GDT_ENTRY_TLS_MIN
,
1336 .size
= sizeof(struct user_desc
),
1337 .align
= sizeof(struct user_desc
),
1338 .active
= regset_tls_active
,
1339 .get
= regset_tls_get
, .set
= regset_tls_set
1341 [REGSET_IOPERM32
] = {
1342 .core_note_type
= NT_386_IOPERM
,
1343 .n
= IO_BITMAP_BYTES
/ sizeof(u32
),
1344 .size
= sizeof(u32
), .align
= sizeof(u32
),
1345 .active
= ioperm_active
, .get
= ioperm_get
1349 static const struct user_regset_view user_x86_32_view
= {
1350 .name
= "i386", .e_machine
= EM_386
,
1351 .regsets
= x86_32_regsets
, .n
= ARRAY_SIZE(x86_32_regsets
)
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 void send_sigtrap(struct task_struct
*tsk
, struct pt_regs
*regs
,
1369 int error_code
, int si_code
)
1371 struct siginfo info
;
1373 tsk
->thread
.trap_no
= 1;
1374 tsk
->thread
.error_code
= error_code
;
1376 memset(&info
, 0, sizeof(info
));
1377 info
.si_signo
= SIGTRAP
;
1378 info
.si_code
= si_code
;
1381 info
.si_addr
= user_mode_vm(regs
) ? (void __user
*) regs
->ip
: NULL
;
1383 /* Send us the fake SIGTRAP */
1384 force_sig_info(SIGTRAP
, &info
, tsk
);
1388 #ifdef CONFIG_X86_32
1390 #elif defined CONFIG_IA32_EMULATION
1391 # define IS_IA32 test_thread_flag(TIF_IA32)
1397 * We must return the syscall number to actually look up in the table.
1398 * This can be -1L to skip running any syscall at all.
1400 asmregparm
long syscall_trace_enter(struct pt_regs
*regs
)
1405 * If we stepped into a sysenter/syscall insn, it trapped in
1406 * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP.
1407 * If user-mode had set TF itself, then it's still clear from
1408 * do_debug() and we need to set it again to restore the user
1409 * state. If we entered on the slow path, TF was already set.
1411 if (test_thread_flag(TIF_SINGLESTEP
))
1412 regs
->flags
|= X86_EFLAGS_TF
;
1414 /* do the secure computing check first */
1415 secure_computing(regs
->orig_ax
);
1417 if (unlikely(test_thread_flag(TIF_SYSCALL_EMU
)))
1420 if ((ret
|| test_thread_flag(TIF_SYSCALL_TRACE
)) &&
1421 tracehook_report_syscall_entry(regs
))
1424 if (unlikely(current
->audit_context
)) {
1426 audit_syscall_entry(AUDIT_ARCH_I386
,
1429 regs
->dx
, regs
->si
);
1430 #ifdef CONFIG_X86_64
1432 audit_syscall_entry(AUDIT_ARCH_X86_64
,
1435 regs
->dx
, regs
->r10
);
1439 return ret
?: regs
->orig_ax
;
1442 asmregparm
void syscall_trace_leave(struct pt_regs
*regs
)
1444 if (unlikely(current
->audit_context
))
1445 audit_syscall_exit(AUDITSC_RESULT(regs
->ax
), regs
->ax
);
1447 if (test_thread_flag(TIF_SYSCALL_TRACE
))
1448 tracehook_report_syscall_exit(regs
, 0);
1451 * If TIF_SYSCALL_EMU is set, we only get here because of
1452 * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP).
1453 * We already reported this syscall instruction in
1454 * syscall_trace_enter(), so don't do any more now.
1456 if (unlikely(test_thread_flag(TIF_SYSCALL_EMU
)))
1460 * If we are single-stepping, synthesize a trap to follow the
1461 * system call instruction.
1463 if (test_thread_flag(TIF_SINGLESTEP
) &&
1464 tracehook_consider_fatal_signal(current
, SIGTRAP
, SIG_DFL
))
1465 send_sigtrap(current
, regs
, 0, TRAP_BRKPT
);