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/user.h>
18 #include <linux/elf.h>
19 #include <linux/security.h>
20 #include <linux/audit.h>
21 #include <linux/seccomp.h>
22 #include <linux/signal.h>
24 #include <asm/uaccess.h>
25 #include <asm/pgtable.h>
26 #include <asm/system.h>
27 #include <asm/processor.h>
29 #include <asm/debugreg.h>
32 #include <asm/prctl.h>
33 #include <asm/proto.h>
46 * does not yet catch signals sent when the child dies.
47 * in exit.c or in signal.c.
51 * Determines which flags the user has access to [1 = access, 0 = no access].
53 #define FLAG_MASK_32 ((unsigned long) \
54 (X86_EFLAGS_CF | X86_EFLAGS_PF | \
55 X86_EFLAGS_AF | X86_EFLAGS_ZF | \
56 X86_EFLAGS_SF | X86_EFLAGS_TF | \
57 X86_EFLAGS_DF | X86_EFLAGS_OF | \
58 X86_EFLAGS_RF | X86_EFLAGS_AC))
61 * Determines whether a value may be installed in a segment register.
63 static inline bool invalid_selector(u16 value
)
65 return unlikely(value
!= 0 && (value
& SEGMENT_RPL_MASK
) != USER_RPL
);
70 #define FLAG_MASK FLAG_MASK_32
72 static long *pt_regs_access(struct pt_regs
*regs
, unsigned long regno
)
74 BUILD_BUG_ON(offsetof(struct pt_regs
, bx
) != 0);
78 return ®s
->bx
+ regno
;
81 static u16
get_segment_reg(struct task_struct
*task
, unsigned long offset
)
84 * Returning the value truncates it to 16 bits.
87 if (offset
!= offsetof(struct user_regs_struct
, gs
))
88 retval
= *pt_regs_access(task_pt_regs(task
), offset
);
90 retval
= task
->thread
.gs
;
92 savesegment(gs
, retval
);
97 static int set_segment_reg(struct task_struct
*task
,
98 unsigned long offset
, u16 value
)
101 * The value argument was already truncated to 16 bits.
103 if (invalid_selector(value
))
106 if (offset
!= offsetof(struct user_regs_struct
, gs
))
107 *pt_regs_access(task_pt_regs(task
), offset
) = value
;
109 task
->thread
.gs
= value
;
112 * The user-mode %gs is not affected by
113 * kernel entry, so we must update the CPU.
115 loadsegment(gs
, value
);
121 static unsigned long debugreg_addr_limit(struct task_struct
*task
)
123 return TASK_SIZE
- 3;
126 #else /* CONFIG_X86_64 */
128 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
130 static unsigned long *pt_regs_access(struct pt_regs
*regs
, unsigned long offset
)
132 BUILD_BUG_ON(offsetof(struct pt_regs
, r15
) != 0);
133 return ®s
->r15
+ (offset
/ sizeof(regs
->r15
));
136 static u16
get_segment_reg(struct task_struct
*task
, unsigned long offset
)
139 * Returning the value truncates it to 16 bits.
144 case offsetof(struct user_regs_struct
, fs
):
145 if (task
== current
) {
146 /* Older gas can't assemble movq %?s,%r?? */
147 asm("movl %%fs,%0" : "=r" (seg
));
150 return task
->thread
.fsindex
;
151 case offsetof(struct user_regs_struct
, gs
):
152 if (task
== current
) {
153 asm("movl %%gs,%0" : "=r" (seg
));
156 return task
->thread
.gsindex
;
157 case offsetof(struct user_regs_struct
, ds
):
158 if (task
== current
) {
159 asm("movl %%ds,%0" : "=r" (seg
));
162 return task
->thread
.ds
;
163 case offsetof(struct user_regs_struct
, es
):
164 if (task
== current
) {
165 asm("movl %%es,%0" : "=r" (seg
));
168 return task
->thread
.es
;
170 case offsetof(struct user_regs_struct
, cs
):
171 case offsetof(struct user_regs_struct
, ss
):
174 return *pt_regs_access(task_pt_regs(task
), offset
);
177 static int set_segment_reg(struct task_struct
*task
,
178 unsigned long offset
, u16 value
)
181 * The value argument was already truncated to 16 bits.
183 if (invalid_selector(value
))
187 case offsetof(struct user_regs_struct
,fs
):
189 * If this is setting fs as for normal 64-bit use but
190 * setting fs_base has implicitly changed it, leave it.
192 if ((value
== FS_TLS_SEL
&& task
->thread
.fsindex
== 0 &&
193 task
->thread
.fs
!= 0) ||
194 (value
== 0 && task
->thread
.fsindex
== FS_TLS_SEL
&&
195 task
->thread
.fs
== 0))
197 task
->thread
.fsindex
= value
;
199 loadsegment(fs
, task
->thread
.fsindex
);
201 case offsetof(struct user_regs_struct
,gs
):
203 * If this is setting gs as for normal 64-bit use but
204 * setting gs_base has implicitly changed it, leave it.
206 if ((value
== GS_TLS_SEL
&& task
->thread
.gsindex
== 0 &&
207 task
->thread
.gs
!= 0) ||
208 (value
== 0 && task
->thread
.gsindex
== GS_TLS_SEL
&&
209 task
->thread
.gs
== 0))
211 task
->thread
.gsindex
= value
;
213 load_gs_index(task
->thread
.gsindex
);
215 case offsetof(struct user_regs_struct
,ds
):
216 task
->thread
.ds
= value
;
218 loadsegment(ds
, task
->thread
.ds
);
220 case offsetof(struct user_regs_struct
,es
):
221 task
->thread
.es
= value
;
223 loadsegment(es
, task
->thread
.es
);
227 * Can't actually change these in 64-bit mode.
229 case offsetof(struct user_regs_struct
,cs
):
230 #ifdef CONFIG_IA32_EMULATION
231 if (test_tsk_thread_flag(task
, TIF_IA32
))
232 task_pt_regs(task
)->cs
= value
;
235 case offsetof(struct user_regs_struct
,ss
):
236 #ifdef CONFIG_IA32_EMULATION
237 if (test_tsk_thread_flag(task
, TIF_IA32
))
238 task_pt_regs(task
)->ss
= value
;
246 static unsigned long debugreg_addr_limit(struct task_struct
*task
)
248 #ifdef CONFIG_IA32_EMULATION
249 if (test_tsk_thread_flag(task
, TIF_IA32
))
250 return IA32_PAGE_OFFSET
- 3;
252 return TASK_SIZE64
- 7;
255 #endif /* CONFIG_X86_32 */
257 static unsigned long get_flags(struct task_struct
*task
)
259 unsigned long retval
= task_pt_regs(task
)->flags
;
262 * If the debugger set TF, hide it from the readout.
264 if (test_tsk_thread_flag(task
, TIF_FORCED_TF
))
265 retval
&= ~X86_EFLAGS_TF
;
270 static int set_flags(struct task_struct
*task
, unsigned long value
)
272 struct pt_regs
*regs
= task_pt_regs(task
);
275 * If the user value contains TF, mark that
276 * it was not "us" (the debugger) that set it.
277 * If not, make sure it stays set if we had.
279 if (value
& X86_EFLAGS_TF
)
280 clear_tsk_thread_flag(task
, TIF_FORCED_TF
);
281 else if (test_tsk_thread_flag(task
, TIF_FORCED_TF
))
282 value
|= X86_EFLAGS_TF
;
284 regs
->flags
= (regs
->flags
& ~FLAG_MASK
) | (value
& FLAG_MASK
);
289 static int putreg(struct task_struct
*child
,
290 unsigned long offset
, unsigned long value
)
293 case offsetof(struct user_regs_struct
, cs
):
294 case offsetof(struct user_regs_struct
, ds
):
295 case offsetof(struct user_regs_struct
, es
):
296 case offsetof(struct user_regs_struct
, fs
):
297 case offsetof(struct user_regs_struct
, gs
):
298 case offsetof(struct user_regs_struct
, ss
):
299 return set_segment_reg(child
, offset
, value
);
301 case offsetof(struct user_regs_struct
, flags
):
302 return set_flags(child
, value
);
305 case offsetof(struct user_regs_struct
,fs_base
):
306 if (value
>= TASK_SIZE_OF(child
))
309 * When changing the segment base, use do_arch_prctl
310 * to set either thread.fs or thread.fsindex and the
311 * corresponding GDT slot.
313 if (child
->thread
.fs
!= value
)
314 return do_arch_prctl(child
, ARCH_SET_FS
, value
);
316 case offsetof(struct user_regs_struct
,gs_base
):
318 * Exactly the same here as the %fs handling above.
320 if (value
>= TASK_SIZE_OF(child
))
322 if (child
->thread
.gs
!= value
)
323 return do_arch_prctl(child
, ARCH_SET_GS
, value
);
328 *pt_regs_access(task_pt_regs(child
), offset
) = value
;
332 static unsigned long getreg(struct task_struct
*task
, unsigned long offset
)
335 case offsetof(struct user_regs_struct
, cs
):
336 case offsetof(struct user_regs_struct
, ds
):
337 case offsetof(struct user_regs_struct
, es
):
338 case offsetof(struct user_regs_struct
, fs
):
339 case offsetof(struct user_regs_struct
, gs
):
340 case offsetof(struct user_regs_struct
, ss
):
341 return get_segment_reg(task
, offset
);
343 case offsetof(struct user_regs_struct
, flags
):
344 return get_flags(task
);
347 case offsetof(struct user_regs_struct
, fs_base
): {
349 * do_arch_prctl may have used a GDT slot instead of
350 * the MSR. To userland, it appears the same either
351 * way, except the %fs segment selector might not be 0.
353 unsigned int seg
= task
->thread
.fsindex
;
354 if (task
->thread
.fs
!= 0)
355 return task
->thread
.fs
;
357 asm("movl %%fs,%0" : "=r" (seg
));
358 if (seg
!= FS_TLS_SEL
)
360 return get_desc_base(&task
->thread
.tls_array
[FS_TLS
]);
362 case offsetof(struct user_regs_struct
, gs_base
): {
364 * Exactly the same here as the %fs handling above.
366 unsigned int seg
= task
->thread
.gsindex
;
367 if (task
->thread
.gs
!= 0)
368 return task
->thread
.gs
;
370 asm("movl %%gs,%0" : "=r" (seg
));
371 if (seg
!= GS_TLS_SEL
)
373 return get_desc_base(&task
->thread
.tls_array
[GS_TLS
]);
378 return *pt_regs_access(task_pt_regs(task
), offset
);
381 static int genregs_get(struct task_struct
*target
,
382 const struct user_regset
*regset
,
383 unsigned int pos
, unsigned int count
,
384 void *kbuf
, void __user
*ubuf
)
387 unsigned long *k
= kbuf
;
389 *k
++ = getreg(target
, pos
);
394 unsigned long __user
*u
= ubuf
;
396 if (__put_user(getreg(target
, pos
), u
++))
406 static int genregs_set(struct task_struct
*target
,
407 const struct user_regset
*regset
,
408 unsigned int pos
, unsigned int count
,
409 const void *kbuf
, const void __user
*ubuf
)
413 const unsigned long *k
= kbuf
;
414 while (count
> 0 && !ret
) {
415 ret
= putreg(target
, pos
, *k
++);
420 const unsigned long __user
*u
= ubuf
;
421 while (count
> 0 && !ret
) {
423 ret
= __get_user(word
, u
++);
426 ret
= putreg(target
, pos
, word
);
435 * This function is trivial and will be inlined by the compiler.
436 * Having it separates the implementation details of debug
437 * registers from the interface details of ptrace.
439 static unsigned long ptrace_get_debugreg(struct task_struct
*child
, int n
)
442 case 0: return child
->thread
.debugreg0
;
443 case 1: return child
->thread
.debugreg1
;
444 case 2: return child
->thread
.debugreg2
;
445 case 3: return child
->thread
.debugreg3
;
446 case 6: return child
->thread
.debugreg6
;
447 case 7: return child
->thread
.debugreg7
;
452 static int ptrace_set_debugreg(struct task_struct
*child
,
453 int n
, unsigned long data
)
457 if (unlikely(n
== 4 || n
== 5))
460 if (n
< 4 && unlikely(data
>= debugreg_addr_limit(child
)))
464 case 0: child
->thread
.debugreg0
= data
; break;
465 case 1: child
->thread
.debugreg1
= data
; break;
466 case 2: child
->thread
.debugreg2
= data
; break;
467 case 3: child
->thread
.debugreg3
= data
; break;
470 if ((data
& ~0xffffffffUL
) != 0)
472 child
->thread
.debugreg6
= data
;
477 * Sanity-check data. Take one half-byte at once with
478 * check = (val >> (16 + 4*i)) & 0xf. It contains the
479 * R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits
480 * 2 and 3 are LENi. Given a list of invalid values,
481 * we do mask |= 1 << invalid_value, so that
482 * (mask >> check) & 1 is a correct test for invalid
485 * R/Wi contains the type of the breakpoint /
486 * watchpoint, LENi contains the length of the watched
487 * data in the watchpoint case.
489 * The invalid values are:
490 * - LENi == 0x10 (undefined), so mask |= 0x0f00. [32-bit]
491 * - R/Wi == 0x10 (break on I/O reads or writes), so
493 * - R/Wi == 0x00 && LENi != 0x00, so we have mask |=
496 * Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54.
498 * See the Intel Manual "System Programming Guide",
501 * Note that LENi == 0x10 is defined on x86_64 in long
502 * mode (i.e. even for 32-bit userspace software, but
503 * 64-bit kernel), so the x86_64 mask value is 0x5454.
504 * See the AMD manual no. 24593 (AMD64 System Programming)
507 #define DR7_MASK 0x5f54
509 #define DR7_MASK 0x5554
511 data
&= ~DR_CONTROL_RESERVED
;
512 for (i
= 0; i
< 4; i
++)
513 if ((DR7_MASK
>> ((data
>> (16 + 4*i
)) & 0xf)) & 1)
515 child
->thread
.debugreg7
= data
;
517 set_tsk_thread_flag(child
, TIF_DEBUG
);
519 clear_tsk_thread_flag(child
, TIF_DEBUG
);
526 static int ptrace_bts_get_size(struct task_struct
*child
)
528 if (!child
->thread
.ds_area_msr
)
531 return ds_get_bts_index((void *)child
->thread
.ds_area_msr
);
534 static int ptrace_bts_read_record(struct task_struct
*child
,
536 struct bts_struct __user
*out
)
538 struct bts_struct ret
;
543 if (!child
->thread
.ds_area_msr
)
549 bts_end
= ds_get_bts_end((void *)child
->thread
.ds_area_msr
);
550 if (bts_end
<= index
)
553 /* translate the ptrace bts index into the ds bts index */
554 bts_index
= ds_get_bts_index((void *)child
->thread
.ds_area_msr
);
555 bts_index
-= (index
+ 1);
557 bts_index
+= bts_end
;
559 retval
= ds_read_bts((void *)child
->thread
.ds_area_msr
,
564 if (copy_to_user(out
, &ret
, sizeof(ret
)))
570 static int ptrace_bts_write_record(struct task_struct
*child
,
571 const struct bts_struct
*in
)
575 if (!child
->thread
.ds_area_msr
)
578 retval
= ds_write_bts((void *)child
->thread
.ds_area_msr
, in
);
585 static int ptrace_bts_clear(struct task_struct
*child
)
587 if (!child
->thread
.ds_area_msr
)
590 return ds_clear((void *)child
->thread
.ds_area_msr
);
593 static int ptrace_bts_drain(struct task_struct
*child
,
595 struct bts_struct __user
*out
)
598 void *ds
= (void *)child
->thread
.ds_area_msr
;
603 end
= ds_get_bts_index(ds
);
607 if (size
< (end
* sizeof(struct bts_struct
)))
610 for (i
= 0; i
< end
; i
++, out
++) {
611 struct bts_struct ret
;
614 retval
= ds_read_bts(ds
, i
, &ret
);
618 if (copy_to_user(out
, &ret
, sizeof(ret
)))
627 static int ptrace_bts_realloc(struct task_struct
*child
,
628 int size
, int reduce_size
)
630 unsigned long rlim
, vm
;
636 old_size
= ds_get_bts_size((void *)child
->thread
.ds_area_msr
);
640 ret
= ds_free((void **)&child
->thread
.ds_area_msr
);
645 old_size
>>= PAGE_SHIFT
;
647 current
->mm
->total_vm
-= old_size
;
648 current
->mm
->locked_vm
-= old_size
;
653 rlim
= current
->signal
->rlim
[RLIMIT_AS
].rlim_cur
>> PAGE_SHIFT
;
654 vm
= current
->mm
->total_vm
+ size
;
661 size
= rlim
- current
->mm
->total_vm
;
666 rlim
= current
->signal
->rlim
[RLIMIT_MEMLOCK
].rlim_cur
>> PAGE_SHIFT
;
667 vm
= current
->mm
->locked_vm
+ size
;
674 size
= rlim
- current
->mm
->locked_vm
;
679 ret
= ds_allocate((void **)&child
->thread
.ds_area_msr
,
684 current
->mm
->total_vm
+= size
;
685 current
->mm
->locked_vm
+= size
;
688 if (child
->thread
.ds_area_msr
)
689 set_tsk_thread_flag(child
, TIF_DS_AREA_MSR
);
691 clear_tsk_thread_flag(child
, TIF_DS_AREA_MSR
);
696 static int ptrace_bts_config(struct task_struct
*child
,
698 const struct ptrace_bts_config __user
*ucfg
)
700 struct ptrace_bts_config cfg
;
701 int bts_size
, ret
= 0;
704 if (cfg_size
< sizeof(cfg
))
707 if (copy_from_user(&cfg
, ucfg
, sizeof(cfg
)))
710 if ((int)cfg
.size
< 0)
714 ds
= (void *)child
->thread
.ds_area_msr
;
716 bts_size
= ds_get_bts_size(ds
);
720 cfg
.size
= PAGE_ALIGN(cfg
.size
);
722 if (bts_size
!= cfg
.size
) {
723 ret
= ptrace_bts_realloc(child
, cfg
.size
,
724 cfg
.flags
& PTRACE_BTS_O_CUT_SIZE
);
728 ds
= (void *)child
->thread
.ds_area_msr
;
731 if (cfg
.flags
& PTRACE_BTS_O_SIGNAL
)
732 ret
= ds_set_overflow(ds
, DS_O_SIGNAL
);
734 ret
= ds_set_overflow(ds
, DS_O_WRAP
);
738 if (cfg
.flags
& PTRACE_BTS_O_TRACE
)
739 child
->thread
.debugctlmsr
|= ds_debugctl_mask();
741 child
->thread
.debugctlmsr
&= ~ds_debugctl_mask();
743 if (cfg
.flags
& PTRACE_BTS_O_SCHED
)
744 set_tsk_thread_flag(child
, TIF_BTS_TRACE_TS
);
746 clear_tsk_thread_flag(child
, TIF_BTS_TRACE_TS
);
751 if (child
->thread
.debugctlmsr
)
752 set_tsk_thread_flag(child
, TIF_DEBUGCTLMSR
);
754 clear_tsk_thread_flag(child
, TIF_DEBUGCTLMSR
);
759 child
->thread
.debugctlmsr
&= ~ds_debugctl_mask();
760 clear_tsk_thread_flag(child
, TIF_BTS_TRACE_TS
);
764 static int ptrace_bts_status(struct task_struct
*child
,
766 struct ptrace_bts_config __user
*ucfg
)
768 void *ds
= (void *)child
->thread
.ds_area_msr
;
769 struct ptrace_bts_config cfg
;
771 if (cfg_size
< sizeof(cfg
))
774 memset(&cfg
, 0, sizeof(cfg
));
777 cfg
.size
= ds_get_bts_size(ds
);
779 if (ds_get_overflow(ds
) == DS_O_SIGNAL
)
780 cfg
.flags
|= PTRACE_BTS_O_SIGNAL
;
782 if (test_tsk_thread_flag(child
, TIF_DEBUGCTLMSR
) &&
783 child
->thread
.debugctlmsr
& ds_debugctl_mask())
784 cfg
.flags
|= PTRACE_BTS_O_TRACE
;
786 if (test_tsk_thread_flag(child
, TIF_BTS_TRACE_TS
))
787 cfg
.flags
|= PTRACE_BTS_O_SCHED
;
790 cfg
.bts_size
= sizeof(struct bts_struct
);
792 if (copy_to_user(ucfg
, &cfg
, sizeof(cfg
)))
798 void ptrace_bts_take_timestamp(struct task_struct
*tsk
,
799 enum bts_qualifier qualifier
)
801 struct bts_struct rec
= {
802 .qualifier
= qualifier
,
803 .variant
.jiffies
= jiffies_64
806 ptrace_bts_write_record(tsk
, &rec
);
810 * Called by kernel/ptrace.c when detaching..
812 * Make sure the single step bit is not set.
814 void ptrace_disable(struct task_struct
*child
)
816 user_disable_single_step(child
);
817 #ifdef TIF_SYSCALL_EMU
818 clear_tsk_thread_flag(child
, TIF_SYSCALL_EMU
);
820 if (child
->thread
.ds_area_msr
) {
821 ptrace_bts_realloc(child
, 0, 0);
822 child
->thread
.debugctlmsr
&= ~ds_debugctl_mask();
823 if (!child
->thread
.debugctlmsr
)
824 clear_tsk_thread_flag(child
, TIF_DEBUGCTLMSR
);
825 clear_tsk_thread_flag(child
, TIF_BTS_TRACE_TS
);
829 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
830 static const struct user_regset_view user_x86_32_view
; /* Initialized below. */
833 long arch_ptrace(struct task_struct
*child
, long request
, long addr
, long data
)
836 unsigned long __user
*datap
= (unsigned long __user
*)data
;
839 /* read the word at location addr in the USER area. */
840 case PTRACE_PEEKUSR
: {
844 if ((addr
& (sizeof(data
) - 1)) || addr
< 0 ||
845 addr
>= sizeof(struct user
))
848 tmp
= 0; /* Default return condition */
849 if (addr
< sizeof(struct user_regs_struct
))
850 tmp
= getreg(child
, addr
);
851 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
852 addr
<= offsetof(struct user
, u_debugreg
[7])) {
853 addr
-= offsetof(struct user
, u_debugreg
[0]);
854 tmp
= ptrace_get_debugreg(child
, addr
/ sizeof(data
));
856 ret
= put_user(tmp
, datap
);
860 case PTRACE_POKEUSR
: /* write the word at location addr in the USER area */
862 if ((addr
& (sizeof(data
) - 1)) || addr
< 0 ||
863 addr
>= sizeof(struct user
))
866 if (addr
< sizeof(struct user_regs_struct
))
867 ret
= putreg(child
, addr
, data
);
868 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
869 addr
<= offsetof(struct user
, u_debugreg
[7])) {
870 addr
-= offsetof(struct user
, u_debugreg
[0]);
871 ret
= ptrace_set_debugreg(child
,
872 addr
/ sizeof(data
), data
);
876 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
877 return copy_regset_to_user(child
,
878 task_user_regset_view(current
),
880 0, sizeof(struct user_regs_struct
),
883 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
884 return copy_regset_from_user(child
,
885 task_user_regset_view(current
),
887 0, sizeof(struct user_regs_struct
),
890 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
891 return copy_regset_to_user(child
,
892 task_user_regset_view(current
),
894 0, sizeof(struct user_i387_struct
),
897 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
898 return copy_regset_from_user(child
,
899 task_user_regset_view(current
),
901 0, sizeof(struct user_i387_struct
),
905 case PTRACE_GETFPXREGS
: /* Get the child extended FPU state. */
906 return copy_regset_to_user(child
, &user_x86_32_view
,
908 0, sizeof(struct user_fxsr_struct
),
911 case PTRACE_SETFPXREGS
: /* Set the child extended FPU state. */
912 return copy_regset_from_user(child
, &user_x86_32_view
,
914 0, sizeof(struct user_fxsr_struct
),
918 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
919 case PTRACE_GET_THREAD_AREA
:
922 ret
= do_get_thread_area(child
, addr
,
923 (struct user_desc __user
*) data
);
926 case PTRACE_SET_THREAD_AREA
:
929 ret
= do_set_thread_area(child
, addr
,
930 (struct user_desc __user
*) data
, 0);
935 /* normal 64bit interface to access TLS data.
936 Works just like arch_prctl, except that the arguments
938 case PTRACE_ARCH_PRCTL
:
939 ret
= do_arch_prctl(child
, data
, addr
);
943 case PTRACE_BTS_CONFIG
:
944 ret
= ptrace_bts_config
945 (child
, data
, (struct ptrace_bts_config __user
*)addr
);
948 case PTRACE_BTS_STATUS
:
949 ret
= ptrace_bts_status
950 (child
, data
, (struct ptrace_bts_config __user
*)addr
);
953 case PTRACE_BTS_SIZE
:
954 ret
= ptrace_bts_get_size(child
);
958 ret
= ptrace_bts_read_record
959 (child
, data
, (struct bts_struct __user
*) addr
);
962 case PTRACE_BTS_CLEAR
:
963 ret
= ptrace_bts_clear(child
);
966 case PTRACE_BTS_DRAIN
:
967 ret
= ptrace_bts_drain
968 (child
, data
, (struct bts_struct __user
*) addr
);
972 ret
= ptrace_request(child
, request
, addr
, data
);
979 #ifdef CONFIG_IA32_EMULATION
981 #include <linux/compat.h>
982 #include <linux/syscalls.h>
983 #include <asm/ia32.h>
984 #include <asm/user32.h>
987 case offsetof(struct user32, regs.l): \
988 regs->q = value; break
991 case offsetof(struct user32, regs.rs): \
992 return set_segment_reg(child, \
993 offsetof(struct user_regs_struct, rs), \
997 static int putreg32(struct task_struct
*child
, unsigned regno
, u32 value
)
999 struct pt_regs
*regs
= task_pt_regs(child
);
1017 R32(orig_eax
, orig_ax
);
1021 case offsetof(struct user32
, regs
.eflags
):
1022 return set_flags(child
, value
);
1024 case offsetof(struct user32
, u_debugreg
[0]) ...
1025 offsetof(struct user32
, u_debugreg
[7]):
1026 regno
-= offsetof(struct user32
, u_debugreg
[0]);
1027 return ptrace_set_debugreg(child
, regno
/ 4, value
);
1030 if (regno
> sizeof(struct user32
) || (regno
& 3))
1034 * Other dummy fields in the virtual user structure
1046 case offsetof(struct user32, regs.l): \
1047 *val = regs->q; break
1050 case offsetof(struct user32, regs.rs): \
1051 *val = get_segment_reg(child, \
1052 offsetof(struct user_regs_struct, rs)); \
1055 static int getreg32(struct task_struct
*child
, unsigned regno
, u32
*val
)
1057 struct pt_regs
*regs
= task_pt_regs(child
);
1075 R32(orig_eax
, orig_ax
);
1079 case offsetof(struct user32
, regs
.eflags
):
1080 *val
= get_flags(child
);
1083 case offsetof(struct user32
, u_debugreg
[0]) ...
1084 offsetof(struct user32
, u_debugreg
[7]):
1085 regno
-= offsetof(struct user32
, u_debugreg
[0]);
1086 *val
= ptrace_get_debugreg(child
, regno
/ 4);
1090 if (regno
> sizeof(struct user32
) || (regno
& 3))
1094 * Other dummy fields in the virtual user structure
1106 static int genregs32_get(struct task_struct
*target
,
1107 const struct user_regset
*regset
,
1108 unsigned int pos
, unsigned int count
,
1109 void *kbuf
, void __user
*ubuf
)
1112 compat_ulong_t
*k
= kbuf
;
1114 getreg32(target
, pos
, k
++);
1115 count
-= sizeof(*k
);
1119 compat_ulong_t __user
*u
= ubuf
;
1121 compat_ulong_t word
;
1122 getreg32(target
, pos
, &word
);
1123 if (__put_user(word
, u
++))
1125 count
-= sizeof(*u
);
1133 static int genregs32_set(struct task_struct
*target
,
1134 const struct user_regset
*regset
,
1135 unsigned int pos
, unsigned int count
,
1136 const void *kbuf
, const void __user
*ubuf
)
1140 const compat_ulong_t
*k
= kbuf
;
1141 while (count
> 0 && !ret
) {
1142 ret
= putreg(target
, pos
, *k
++);
1143 count
-= sizeof(*k
);
1147 const compat_ulong_t __user
*u
= ubuf
;
1148 while (count
> 0 && !ret
) {
1149 compat_ulong_t word
;
1150 ret
= __get_user(word
, u
++);
1153 ret
= putreg(target
, pos
, word
);
1154 count
-= sizeof(*u
);
1161 static long ptrace32_siginfo(unsigned request
, u32 pid
, u32 addr
, u32 data
)
1163 siginfo_t __user
*si
= compat_alloc_user_space(sizeof(siginfo_t
));
1164 compat_siginfo_t __user
*si32
= compat_ptr(data
);
1168 if (request
== PTRACE_SETSIGINFO
) {
1169 memset(&ssi
, 0, sizeof(siginfo_t
));
1170 ret
= copy_siginfo_from_user32(&ssi
, si32
);
1173 if (copy_to_user(si
, &ssi
, sizeof(siginfo_t
)))
1176 ret
= sys_ptrace(request
, pid
, addr
, (unsigned long)si
);
1179 if (request
== PTRACE_GETSIGINFO
) {
1180 if (copy_from_user(&ssi
, si
, sizeof(siginfo_t
)))
1182 ret
= copy_siginfo_to_user32(si32
, &ssi
);
1187 asmlinkage
long sys32_ptrace(long request
, u32 pid
, u32 addr
, u32 data
)
1189 struct task_struct
*child
;
1190 struct pt_regs
*childregs
;
1191 void __user
*datap
= compat_ptr(data
);
1196 case PTRACE_TRACEME
:
1200 case PTRACE_SINGLESTEP
:
1201 case PTRACE_SINGLEBLOCK
:
1203 case PTRACE_SYSCALL
:
1204 case PTRACE_OLDSETOPTIONS
:
1205 case PTRACE_SETOPTIONS
:
1206 case PTRACE_SET_THREAD_AREA
:
1207 case PTRACE_GET_THREAD_AREA
:
1208 case PTRACE_BTS_CONFIG
:
1209 case PTRACE_BTS_STATUS
:
1210 case PTRACE_BTS_SIZE
:
1211 case PTRACE_BTS_GET
:
1212 case PTRACE_BTS_CLEAR
:
1213 case PTRACE_BTS_DRAIN
:
1214 return sys_ptrace(request
, pid
, addr
, data
);
1219 case PTRACE_PEEKTEXT
:
1220 case PTRACE_PEEKDATA
:
1221 case PTRACE_POKEDATA
:
1222 case PTRACE_POKETEXT
:
1223 case PTRACE_POKEUSR
:
1224 case PTRACE_PEEKUSR
:
1225 case PTRACE_GETREGS
:
1226 case PTRACE_SETREGS
:
1227 case PTRACE_SETFPREGS
:
1228 case PTRACE_GETFPREGS
:
1229 case PTRACE_SETFPXREGS
:
1230 case PTRACE_GETFPXREGS
:
1231 case PTRACE_GETEVENTMSG
:
1234 case PTRACE_SETSIGINFO
:
1235 case PTRACE_GETSIGINFO
:
1236 return ptrace32_siginfo(request
, pid
, addr
, data
);
1239 child
= ptrace_get_task_struct(pid
);
1241 return PTR_ERR(child
);
1243 ret
= ptrace_check_attach(child
, request
== PTRACE_KILL
);
1247 childregs
= task_pt_regs(child
);
1250 case PTRACE_PEEKUSR
:
1251 ret
= getreg32(child
, addr
, &val
);
1253 ret
= put_user(val
, (__u32 __user
*)datap
);
1256 case PTRACE_POKEUSR
:
1257 ret
= putreg32(child
, addr
, data
);
1260 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
1261 return copy_regset_to_user(child
, &user_x86_32_view
,
1263 0, sizeof(struct user_regs_struct32
),
1266 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
1267 return copy_regset_from_user(child
, &user_x86_32_view
,
1269 sizeof(struct user_regs_struct32
),
1272 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
1273 return copy_regset_to_user(child
, &user_x86_32_view
,
1275 sizeof(struct user_i387_ia32_struct
),
1278 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
1279 return copy_regset_from_user(
1280 child
, &user_x86_32_view
, REGSET_FP
,
1281 0, sizeof(struct user_i387_ia32_struct
), datap
);
1283 case PTRACE_GETFPXREGS
: /* Get the child extended FPU state. */
1284 return copy_regset_to_user(child
, &user_x86_32_view
,
1286 sizeof(struct user32_fxsr_struct
),
1289 case PTRACE_SETFPXREGS
: /* Set the child extended FPU state. */
1290 return copy_regset_from_user(child
, &user_x86_32_view
,
1292 sizeof(struct user32_fxsr_struct
),
1296 return compat_ptrace_request(child
, request
, addr
, data
);
1300 put_task_struct(child
);
1304 #endif /* CONFIG_IA32_EMULATION */
1306 #ifdef CONFIG_X86_64
1308 static const struct user_regset x86_64_regsets
[] = {
1309 [REGSET_GENERAL
] = {
1310 .core_note_type
= NT_PRSTATUS
,
1311 .n
= sizeof(struct user_regs_struct
) / sizeof(long),
1312 .size
= sizeof(long), .align
= sizeof(long),
1313 .get
= genregs_get
, .set
= genregs_set
1316 .core_note_type
= NT_PRFPREG
,
1317 .n
= sizeof(struct user_i387_struct
) / sizeof(long),
1318 .size
= sizeof(long), .align
= sizeof(long),
1319 .active
= xfpregs_active
, .get
= xfpregs_get
, .set
= xfpregs_set
1323 static const struct user_regset_view user_x86_64_view
= {
1324 .name
= "x86_64", .e_machine
= EM_X86_64
,
1325 .regsets
= x86_64_regsets
, .n
= ARRAY_SIZE(x86_64_regsets
)
1328 #else /* CONFIG_X86_32 */
1330 #define user_regs_struct32 user_regs_struct
1331 #define genregs32_get genregs_get
1332 #define genregs32_set genregs_set
1334 #endif /* CONFIG_X86_64 */
1336 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1337 static const struct user_regset x86_32_regsets
[] = {
1338 [REGSET_GENERAL
] = {
1339 .core_note_type
= NT_PRSTATUS
,
1340 .n
= sizeof(struct user_regs_struct32
) / sizeof(u32
),
1341 .size
= sizeof(u32
), .align
= sizeof(u32
),
1342 .get
= genregs32_get
, .set
= genregs32_set
1345 .core_note_type
= NT_PRFPREG
,
1346 .n
= sizeof(struct user_i387_struct
) / sizeof(u32
),
1347 .size
= sizeof(u32
), .align
= sizeof(u32
),
1348 .active
= fpregs_active
, .get
= fpregs_get
, .set
= fpregs_set
1351 .core_note_type
= NT_PRXFPREG
,
1352 .n
= sizeof(struct user_i387_struct
) / sizeof(u32
),
1353 .size
= sizeof(u32
), .align
= sizeof(u32
),
1354 .active
= xfpregs_active
, .get
= xfpregs_get
, .set
= xfpregs_set
1357 .core_note_type
= NT_386_TLS
,
1358 .n
= GDT_ENTRY_TLS_ENTRIES
, .bias
= GDT_ENTRY_TLS_MIN
,
1359 .size
= sizeof(struct user_desc
),
1360 .align
= sizeof(struct user_desc
),
1361 .active
= regset_tls_active
,
1362 .get
= regset_tls_get
, .set
= regset_tls_set
1366 static const struct user_regset_view user_x86_32_view
= {
1367 .name
= "i386", .e_machine
= EM_386
,
1368 .regsets
= x86_32_regsets
, .n
= ARRAY_SIZE(x86_32_regsets
)
1372 const struct user_regset_view
*task_user_regset_view(struct task_struct
*task
)
1374 #ifdef CONFIG_IA32_EMULATION
1375 if (test_tsk_thread_flag(task
, TIF_IA32
))
1377 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1378 return &user_x86_32_view
;
1380 #ifdef CONFIG_X86_64
1381 return &user_x86_64_view
;
1385 #ifdef CONFIG_X86_32
1387 void send_sigtrap(struct task_struct
*tsk
, struct pt_regs
*regs
, int error_code
)
1389 struct siginfo info
;
1391 tsk
->thread
.trap_no
= 1;
1392 tsk
->thread
.error_code
= error_code
;
1394 memset(&info
, 0, sizeof(info
));
1395 info
.si_signo
= SIGTRAP
;
1396 info
.si_code
= TRAP_BRKPT
;
1399 info
.si_addr
= user_mode_vm(regs
) ? (void __user
*) regs
->ip
: NULL
;
1401 /* Send us the fake SIGTRAP */
1402 force_sig_info(SIGTRAP
, &info
, tsk
);
1405 /* notification of system call entry/exit
1406 * - triggered by current->work.syscall_trace
1408 __attribute__((regparm(3)))
1409 int do_syscall_trace(struct pt_regs
*regs
, int entryexit
)
1411 int is_sysemu
= test_thread_flag(TIF_SYSCALL_EMU
);
1413 * With TIF_SYSCALL_EMU set we want to ignore TIF_SINGLESTEP for syscall
1416 int is_singlestep
= !is_sysemu
&& test_thread_flag(TIF_SINGLESTEP
);
1419 /* do the secure computing check first */
1421 secure_computing(regs
->orig_ax
);
1423 if (unlikely(current
->audit_context
)) {
1425 audit_syscall_exit(AUDITSC_RESULT(regs
->ax
),
1427 /* Debug traps, when using PTRACE_SINGLESTEP, must be sent only
1428 * on the syscall exit path. Normally, when TIF_SYSCALL_AUDIT is
1429 * not used, entry.S will call us only on syscall exit, not
1430 * entry; so when TIF_SYSCALL_AUDIT is used we must avoid
1431 * calling send_sigtrap() on syscall entry.
1433 * Note that when PTRACE_SYSEMU_SINGLESTEP is used,
1434 * is_singlestep is false, despite his name, so we will still do
1435 * the correct thing.
1437 else if (is_singlestep
)
1441 if (!(current
->ptrace
& PT_PTRACED
))
1444 /* If a process stops on the 1st tracepoint with SYSCALL_TRACE
1445 * and then is resumed with SYSEMU_SINGLESTEP, it will come in
1446 * here. We have to check this and return */
1447 if (is_sysemu
&& entryexit
)
1450 /* Fake a debug trap */
1452 send_sigtrap(current
, regs
, 0);
1454 if (!test_thread_flag(TIF_SYSCALL_TRACE
) && !is_sysemu
)
1457 /* the 0x80 provides a way for the tracing parent to distinguish
1458 between a syscall stop and SIGTRAP delivery */
1459 /* Note that the debugger could change the result of test_thread_flag!*/
1460 ptrace_notify(SIGTRAP
| ((current
->ptrace
& PT_TRACESYSGOOD
) ? 0x80:0));
1463 * this isn't the same as continuing with a signal, but it will do
1464 * for normal use. strace only continues with a signal if the
1465 * stopping signal is not SIGTRAP. -brl
1467 if (current
->exit_code
) {
1468 send_sig(current
->exit_code
, current
, 1);
1469 current
->exit_code
= 0;
1473 if (unlikely(current
->audit_context
) && !entryexit
)
1474 audit_syscall_entry(AUDIT_ARCH_I386
, regs
->orig_ax
,
1475 regs
->bx
, regs
->cx
, regs
->dx
, regs
->si
);
1479 regs
->orig_ax
= -1; /* force skip of syscall restarting */
1480 if (unlikely(current
->audit_context
))
1481 audit_syscall_exit(AUDITSC_RESULT(regs
->ax
), regs
->ax
);
1485 #else /* CONFIG_X86_64 */
1487 static void syscall_trace(struct pt_regs
*regs
)
1491 printk("trace %s ip %lx sp %lx ax %d origrax %d caller %lx tiflags %x ptrace %x\n",
1493 regs
->ip
, regs
->sp
, regs
->ax
, regs
->orig_ax
, __builtin_return_address(0),
1494 current_thread_info()->flags
, current
->ptrace
);
1497 ptrace_notify(SIGTRAP
| ((current
->ptrace
& PT_TRACESYSGOOD
)
1500 * this isn't the same as continuing with a signal, but it will do
1501 * for normal use. strace only continues with a signal if the
1502 * stopping signal is not SIGTRAP. -brl
1504 if (current
->exit_code
) {
1505 send_sig(current
->exit_code
, current
, 1);
1506 current
->exit_code
= 0;
1510 asmlinkage
void syscall_trace_enter(struct pt_regs
*regs
)
1512 /* do the secure computing check first */
1513 secure_computing(regs
->orig_ax
);
1515 if (test_thread_flag(TIF_SYSCALL_TRACE
)
1516 && (current
->ptrace
& PT_PTRACED
))
1517 syscall_trace(regs
);
1519 if (unlikely(current
->audit_context
)) {
1520 if (test_thread_flag(TIF_IA32
)) {
1521 audit_syscall_entry(AUDIT_ARCH_I386
,
1524 regs
->dx
, regs
->si
);
1526 audit_syscall_entry(AUDIT_ARCH_X86_64
,
1529 regs
->dx
, regs
->r10
);
1534 asmlinkage
void syscall_trace_leave(struct pt_regs
*regs
)
1536 if (unlikely(current
->audit_context
))
1537 audit_syscall_exit(AUDITSC_RESULT(regs
->ax
), regs
->ax
);
1539 if ((test_thread_flag(TIF_SYSCALL_TRACE
)
1540 || test_thread_flag(TIF_SINGLESTEP
))
1541 && (current
->ptrace
& PT_PTRACED
))
1542 syscall_trace(regs
);
1545 #endif /* CONFIG_X86_32 */