1 /* By Ross Biro 1/23/92 */
3 * Pentium III FXSR, SSE support
4 * Gareth Hughes <gareth@valinux.com>, May 2000
7 #include <linux/kernel.h>
8 #include <linux/sched.h>
10 #include <linux/smp.h>
11 #include <linux/errno.h>
12 #include <linux/slab.h>
13 #include <linux/ptrace.h>
14 #include <linux/regset.h>
15 #include <linux/tracehook.h>
16 #include <linux/user.h>
17 #include <linux/elf.h>
18 #include <linux/security.h>
19 #include <linux/audit.h>
20 #include <linux/seccomp.h>
21 #include <linux/signal.h>
22 #include <linux/perf_event.h>
23 #include <linux/hw_breakpoint.h>
25 #include <asm/uaccess.h>
26 #include <asm/pgtable.h>
27 #include <asm/processor.h>
29 #include <asm/fpu-internal.h>
30 #include <asm/debugreg.h>
33 #include <asm/prctl.h>
34 #include <asm/proto.h>
35 #include <asm/hw_breakpoint.h>
36 #include <asm/traps.h>
40 #define CREATE_TRACE_POINTS
41 #include <trace/events/syscalls.h>
47 REGSET_IOPERM64
= REGSET_XFP
,
53 struct pt_regs_offset
{
58 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
59 #define REG_OFFSET_END {.name = NULL, .offset = 0}
61 static const struct pt_regs_offset regoffset_table
[] = {
85 REG_OFFSET_NAME(orig_ax
),
88 REG_OFFSET_NAME(flags
),
95 * regs_query_register_offset() - query register offset from its name
96 * @name: the name of a register
98 * regs_query_register_offset() returns the offset of a register in struct
99 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
101 int regs_query_register_offset(const char *name
)
103 const struct pt_regs_offset
*roff
;
104 for (roff
= regoffset_table
; roff
->name
!= NULL
; roff
++)
105 if (!strcmp(roff
->name
, name
))
111 * regs_query_register_name() - query register name from its offset
112 * @offset: the offset of a register in struct pt_regs.
114 * regs_query_register_name() returns the name of a register from its
115 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
117 const char *regs_query_register_name(unsigned int offset
)
119 const struct pt_regs_offset
*roff
;
120 for (roff
= regoffset_table
; roff
->name
!= NULL
; roff
++)
121 if (roff
->offset
== offset
)
126 static const int arg_offs_table
[] = {
128 [0] = offsetof(struct pt_regs
, ax
),
129 [1] = offsetof(struct pt_regs
, dx
),
130 [2] = offsetof(struct pt_regs
, cx
)
131 #else /* CONFIG_X86_64 */
132 [0] = offsetof(struct pt_regs
, di
),
133 [1] = offsetof(struct pt_regs
, si
),
134 [2] = offsetof(struct pt_regs
, dx
),
135 [3] = offsetof(struct pt_regs
, cx
),
136 [4] = offsetof(struct pt_regs
, r8
),
137 [5] = offsetof(struct pt_regs
, r9
)
142 * does not yet catch signals sent when the child dies.
143 * in exit.c or in signal.c.
147 * Determines which flags the user has access to [1 = access, 0 = no access].
149 #define FLAG_MASK_32 ((unsigned long) \
150 (X86_EFLAGS_CF | X86_EFLAGS_PF | \
151 X86_EFLAGS_AF | X86_EFLAGS_ZF | \
152 X86_EFLAGS_SF | X86_EFLAGS_TF | \
153 X86_EFLAGS_DF | X86_EFLAGS_OF | \
154 X86_EFLAGS_RF | X86_EFLAGS_AC))
157 * Determines whether a value may be installed in a segment register.
159 static inline bool invalid_selector(u16 value
)
161 return unlikely(value
!= 0 && (value
& SEGMENT_RPL_MASK
) != USER_RPL
);
166 #define FLAG_MASK FLAG_MASK_32
168 static unsigned long *pt_regs_access(struct pt_regs
*regs
, unsigned long regno
)
170 BUILD_BUG_ON(offsetof(struct pt_regs
, bx
) != 0);
171 return ®s
->bx
+ (regno
>> 2);
174 static u16
get_segment_reg(struct task_struct
*task
, unsigned long offset
)
177 * Returning the value truncates it to 16 bits.
180 if (offset
!= offsetof(struct user_regs_struct
, gs
))
181 retval
= *pt_regs_access(task_pt_regs(task
), offset
);
184 retval
= get_user_gs(task_pt_regs(task
));
186 retval
= task_user_gs(task
);
191 static int set_segment_reg(struct task_struct
*task
,
192 unsigned long offset
, u16 value
)
195 * The value argument was already truncated to 16 bits.
197 if (invalid_selector(value
))
201 * For %cs and %ss we cannot permit a null selector.
202 * We can permit a bogus selector as long as it has USER_RPL.
203 * Null selectors are fine for other segment registers, but
204 * we will never get back to user mode with invalid %cs or %ss
205 * and will take the trap in iret instead. Much code relies
206 * on user_mode() to distinguish a user trap frame (which can
207 * safely use invalid selectors) from a kernel trap frame.
210 case offsetof(struct user_regs_struct
, cs
):
211 case offsetof(struct user_regs_struct
, ss
):
212 if (unlikely(value
== 0))
216 *pt_regs_access(task_pt_regs(task
), offset
) = value
;
219 case offsetof(struct user_regs_struct
, gs
):
221 set_user_gs(task_pt_regs(task
), value
);
223 task_user_gs(task
) = value
;
229 #else /* CONFIG_X86_64 */
231 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
233 static unsigned long *pt_regs_access(struct pt_regs
*regs
, unsigned long offset
)
235 BUILD_BUG_ON(offsetof(struct pt_regs
, r15
) != 0);
236 return ®s
->r15
+ (offset
/ sizeof(regs
->r15
));
239 static u16
get_segment_reg(struct task_struct
*task
, unsigned long offset
)
242 * Returning the value truncates it to 16 bits.
247 case offsetof(struct user_regs_struct
, fs
):
248 if (task
== current
) {
249 /* Older gas can't assemble movq %?s,%r?? */
250 asm("movl %%fs,%0" : "=r" (seg
));
253 return task
->thread
.fsindex
;
254 case offsetof(struct user_regs_struct
, gs
):
255 if (task
== current
) {
256 asm("movl %%gs,%0" : "=r" (seg
));
259 return task
->thread
.gsindex
;
260 case offsetof(struct user_regs_struct
, ds
):
261 if (task
== current
) {
262 asm("movl %%ds,%0" : "=r" (seg
));
265 return task
->thread
.ds
;
266 case offsetof(struct user_regs_struct
, es
):
267 if (task
== current
) {
268 asm("movl %%es,%0" : "=r" (seg
));
271 return task
->thread
.es
;
273 case offsetof(struct user_regs_struct
, cs
):
274 case offsetof(struct user_regs_struct
, ss
):
277 return *pt_regs_access(task_pt_regs(task
), offset
);
280 static int set_segment_reg(struct task_struct
*task
,
281 unsigned long offset
, u16 value
)
284 * The value argument was already truncated to 16 bits.
286 if (invalid_selector(value
))
290 case offsetof(struct user_regs_struct
,fs
):
292 * If this is setting fs as for normal 64-bit use but
293 * setting fs_base has implicitly changed it, leave it.
295 if ((value
== FS_TLS_SEL
&& task
->thread
.fsindex
== 0 &&
296 task
->thread
.fs
!= 0) ||
297 (value
== 0 && task
->thread
.fsindex
== FS_TLS_SEL
&&
298 task
->thread
.fs
== 0))
300 task
->thread
.fsindex
= value
;
302 loadsegment(fs
, task
->thread
.fsindex
);
304 case offsetof(struct user_regs_struct
,gs
):
306 * If this is setting gs as for normal 64-bit use but
307 * setting gs_base has implicitly changed it, leave it.
309 if ((value
== GS_TLS_SEL
&& task
->thread
.gsindex
== 0 &&
310 task
->thread
.gs
!= 0) ||
311 (value
== 0 && task
->thread
.gsindex
== GS_TLS_SEL
&&
312 task
->thread
.gs
== 0))
314 task
->thread
.gsindex
= value
;
316 load_gs_index(task
->thread
.gsindex
);
318 case offsetof(struct user_regs_struct
,ds
):
319 task
->thread
.ds
= value
;
321 loadsegment(ds
, task
->thread
.ds
);
323 case offsetof(struct user_regs_struct
,es
):
324 task
->thread
.es
= value
;
326 loadsegment(es
, task
->thread
.es
);
330 * Can't actually change these in 64-bit mode.
332 case offsetof(struct user_regs_struct
,cs
):
333 if (unlikely(value
== 0))
335 #ifdef CONFIG_IA32_EMULATION
336 if (test_tsk_thread_flag(task
, TIF_IA32
))
337 task_pt_regs(task
)->cs
= value
;
340 case offsetof(struct user_regs_struct
,ss
):
341 if (unlikely(value
== 0))
343 #ifdef CONFIG_IA32_EMULATION
344 if (test_tsk_thread_flag(task
, TIF_IA32
))
345 task_pt_regs(task
)->ss
= value
;
353 #endif /* CONFIG_X86_32 */
355 static unsigned long get_flags(struct task_struct
*task
)
357 unsigned long retval
= task_pt_regs(task
)->flags
;
360 * If the debugger set TF, hide it from the readout.
362 if (test_tsk_thread_flag(task
, TIF_FORCED_TF
))
363 retval
&= ~X86_EFLAGS_TF
;
368 static int set_flags(struct task_struct
*task
, unsigned long value
)
370 struct pt_regs
*regs
= task_pt_regs(task
);
373 * If the user value contains TF, mark that
374 * it was not "us" (the debugger) that set it.
375 * If not, make sure it stays set if we had.
377 if (value
& X86_EFLAGS_TF
)
378 clear_tsk_thread_flag(task
, TIF_FORCED_TF
);
379 else if (test_tsk_thread_flag(task
, TIF_FORCED_TF
))
380 value
|= X86_EFLAGS_TF
;
382 regs
->flags
= (regs
->flags
& ~FLAG_MASK
) | (value
& FLAG_MASK
);
387 static int putreg(struct task_struct
*child
,
388 unsigned long offset
, unsigned long value
)
391 case offsetof(struct user_regs_struct
, cs
):
392 case offsetof(struct user_regs_struct
, ds
):
393 case offsetof(struct user_regs_struct
, es
):
394 case offsetof(struct user_regs_struct
, fs
):
395 case offsetof(struct user_regs_struct
, gs
):
396 case offsetof(struct user_regs_struct
, ss
):
397 return set_segment_reg(child
, offset
, value
);
399 case offsetof(struct user_regs_struct
, flags
):
400 return set_flags(child
, value
);
403 case offsetof(struct user_regs_struct
,fs_base
):
404 if (value
>= TASK_SIZE_OF(child
))
407 * When changing the segment base, use do_arch_prctl
408 * to set either thread.fs or thread.fsindex and the
409 * corresponding GDT slot.
411 if (child
->thread
.fs
!= value
)
412 return do_arch_prctl(child
, ARCH_SET_FS
, value
);
414 case offsetof(struct user_regs_struct
,gs_base
):
416 * Exactly the same here as the %fs handling above.
418 if (value
>= TASK_SIZE_OF(child
))
420 if (child
->thread
.gs
!= value
)
421 return do_arch_prctl(child
, ARCH_SET_GS
, value
);
426 *pt_regs_access(task_pt_regs(child
), offset
) = value
;
430 static unsigned long getreg(struct task_struct
*task
, unsigned long offset
)
433 case offsetof(struct user_regs_struct
, cs
):
434 case offsetof(struct user_regs_struct
, ds
):
435 case offsetof(struct user_regs_struct
, es
):
436 case offsetof(struct user_regs_struct
, fs
):
437 case offsetof(struct user_regs_struct
, gs
):
438 case offsetof(struct user_regs_struct
, ss
):
439 return get_segment_reg(task
, offset
);
441 case offsetof(struct user_regs_struct
, flags
):
442 return get_flags(task
);
445 case offsetof(struct user_regs_struct
, fs_base
): {
447 * do_arch_prctl may have used a GDT slot instead of
448 * the MSR. To userland, it appears the same either
449 * way, except the %fs segment selector might not be 0.
451 unsigned int seg
= task
->thread
.fsindex
;
452 if (task
->thread
.fs
!= 0)
453 return task
->thread
.fs
;
455 asm("movl %%fs,%0" : "=r" (seg
));
456 if (seg
!= FS_TLS_SEL
)
458 return get_desc_base(&task
->thread
.tls_array
[FS_TLS
]);
460 case offsetof(struct user_regs_struct
, gs_base
): {
462 * Exactly the same here as the %fs handling above.
464 unsigned int seg
= task
->thread
.gsindex
;
465 if (task
->thread
.gs
!= 0)
466 return task
->thread
.gs
;
468 asm("movl %%gs,%0" : "=r" (seg
));
469 if (seg
!= GS_TLS_SEL
)
471 return get_desc_base(&task
->thread
.tls_array
[GS_TLS
]);
476 return *pt_regs_access(task_pt_regs(task
), offset
);
479 static int genregs_get(struct task_struct
*target
,
480 const struct user_regset
*regset
,
481 unsigned int pos
, unsigned int count
,
482 void *kbuf
, void __user
*ubuf
)
485 unsigned long *k
= kbuf
;
486 while (count
>= sizeof(*k
)) {
487 *k
++ = getreg(target
, pos
);
492 unsigned long __user
*u
= ubuf
;
493 while (count
>= sizeof(*u
)) {
494 if (__put_user(getreg(target
, pos
), u
++))
504 static int genregs_set(struct task_struct
*target
,
505 const struct user_regset
*regset
,
506 unsigned int pos
, unsigned int count
,
507 const void *kbuf
, const void __user
*ubuf
)
511 const unsigned long *k
= kbuf
;
512 while (count
>= sizeof(*k
) && !ret
) {
513 ret
= putreg(target
, pos
, *k
++);
518 const unsigned long __user
*u
= ubuf
;
519 while (count
>= sizeof(*u
) && !ret
) {
521 ret
= __get_user(word
, u
++);
524 ret
= putreg(target
, pos
, word
);
532 static void ptrace_triggered(struct perf_event
*bp
,
533 struct perf_sample_data
*data
,
534 struct pt_regs
*regs
)
537 struct thread_struct
*thread
= &(current
->thread
);
540 * Store in the virtual DR6 register the fact that the breakpoint
541 * was hit so the thread's debugger will see it.
543 for (i
= 0; i
< HBP_NUM
; i
++) {
544 if (thread
->ptrace_bps
[i
] == bp
)
548 thread
->debugreg6
|= (DR_TRAP0
<< i
);
552 * Walk through every ptrace breakpoints for this thread and
553 * build the dr7 value on top of their attributes.
556 static unsigned long ptrace_get_dr7(struct perf_event
*bp
[])
560 struct arch_hw_breakpoint
*info
;
562 for (i
= 0; i
< HBP_NUM
; i
++) {
563 if (bp
[i
] && !bp
[i
]->attr
.disabled
) {
564 info
= counter_arch_bp(bp
[i
]);
565 dr7
|= encode_dr7(i
, info
->len
, info
->type
);
573 ptrace_modify_breakpoint(struct perf_event
*bp
, int len
, int type
,
574 struct task_struct
*tsk
, int disabled
)
577 int gen_len
, gen_type
;
578 struct perf_event_attr attr
;
581 * We should have at least an inactive breakpoint at this
582 * slot. It means the user is writing dr7 without having
583 * written the address register first
588 err
= arch_bp_generic_fields(len
, type
, &gen_len
, &gen_type
);
593 attr
.bp_len
= gen_len
;
594 attr
.bp_type
= gen_type
;
595 attr
.disabled
= disabled
;
597 return modify_user_hw_breakpoint(bp
, &attr
);
601 * Handle ptrace writes to debug register 7.
603 static int ptrace_write_dr7(struct task_struct
*tsk
, unsigned long data
)
605 struct thread_struct
*thread
= &(tsk
->thread
);
606 unsigned long old_dr7
;
607 int i
, orig_ret
= 0, rc
= 0;
608 int enabled
, second_pass
= 0;
610 struct perf_event
*bp
;
612 if (ptrace_get_breakpoints(tsk
) < 0)
615 data
&= ~DR_CONTROL_RESERVED
;
616 old_dr7
= ptrace_get_dr7(thread
->ptrace_bps
);
619 * Loop through all the hardware breakpoints, making the
620 * appropriate changes to each.
622 for (i
= 0; i
< HBP_NUM
; i
++) {
623 enabled
= decode_dr7(data
, i
, &len
, &type
);
624 bp
= thread
->ptrace_bps
[i
];
629 * Don't unregister the breakpoints right-away,
630 * unless all register_user_hw_breakpoint()
631 * requests have succeeded. This prevents
632 * any window of opportunity for debug
633 * register grabbing by other users.
638 rc
= ptrace_modify_breakpoint(bp
, len
, type
,
646 rc
= ptrace_modify_breakpoint(bp
, len
, type
, tsk
, 0);
651 * Make a second pass to free the remaining unused breakpoints
652 * or to restore the original breakpoints if an error occurred.
663 ptrace_put_breakpoints(tsk
);
665 return ((orig_ret
< 0) ? orig_ret
: rc
);
669 * Handle PTRACE_PEEKUSR calls for the debug register area.
671 static unsigned long ptrace_get_debugreg(struct task_struct
*tsk
, int n
)
673 struct thread_struct
*thread
= &(tsk
->thread
);
674 unsigned long val
= 0;
677 struct perf_event
*bp
;
679 if (ptrace_get_breakpoints(tsk
) < 0)
682 bp
= thread
->ptrace_bps
[n
];
686 val
= bp
->hw
.info
.address
;
688 ptrace_put_breakpoints(tsk
);
690 val
= thread
->debugreg6
;
692 val
= thread
->ptrace_dr7
;
697 static int ptrace_set_breakpoint_addr(struct task_struct
*tsk
, int nr
,
700 struct perf_event
*bp
;
701 struct thread_struct
*t
= &tsk
->thread
;
702 struct perf_event_attr attr
;
705 if (ptrace_get_breakpoints(tsk
) < 0)
708 if (!t
->ptrace_bps
[nr
]) {
709 ptrace_breakpoint_init(&attr
);
711 * Put stub len and type to register (reserve) an inactive but
715 attr
.bp_len
= HW_BREAKPOINT_LEN_1
;
716 attr
.bp_type
= HW_BREAKPOINT_W
;
719 bp
= register_user_hw_breakpoint(&attr
, ptrace_triggered
,
723 * CHECKME: the previous code returned -EIO if the addr wasn't
724 * a valid task virtual addr. The new one will return -EINVAL in
726 * -EINVAL may be what we want for in-kernel breakpoints users,
727 * but -EIO looks better for ptrace, since we refuse a register
728 * writing for the user. And anyway this is the previous
736 t
->ptrace_bps
[nr
] = bp
;
738 bp
= t
->ptrace_bps
[nr
];
742 err
= modify_user_hw_breakpoint(bp
, &attr
);
746 ptrace_put_breakpoints(tsk
);
751 * Handle PTRACE_POKEUSR calls for the debug register area.
753 static int ptrace_set_debugreg(struct task_struct
*tsk
, int n
,
756 struct thread_struct
*thread
= &(tsk
->thread
);
759 /* There are no DR4 or DR5 registers */
760 if (n
== 4 || n
== 5)
764 thread
->debugreg6
= val
;
768 rc
= ptrace_set_breakpoint_addr(tsk
, n
, val
);
772 /* All that's left is DR7 */
774 rc
= ptrace_write_dr7(tsk
, val
);
776 thread
->ptrace_dr7
= val
;
784 * These access the current or another (stopped) task's io permission
785 * bitmap for debugging or core dump.
787 static int ioperm_active(struct task_struct
*target
,
788 const struct user_regset
*regset
)
790 return target
->thread
.io_bitmap_max
/ regset
->size
;
793 static int ioperm_get(struct task_struct
*target
,
794 const struct user_regset
*regset
,
795 unsigned int pos
, unsigned int count
,
796 void *kbuf
, void __user
*ubuf
)
798 if (!target
->thread
.io_bitmap_ptr
)
801 return user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
,
802 target
->thread
.io_bitmap_ptr
,
807 * Called by kernel/ptrace.c when detaching..
809 * Make sure the single step bit is not set.
811 void ptrace_disable(struct task_struct
*child
)
813 user_disable_single_step(child
);
814 #ifdef TIF_SYSCALL_EMU
815 clear_tsk_thread_flag(child
, TIF_SYSCALL_EMU
);
819 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
820 static const struct user_regset_view user_x86_32_view
; /* Initialized below. */
823 long arch_ptrace(struct task_struct
*child
, long request
,
824 unsigned long addr
, unsigned long data
)
827 unsigned long __user
*datap
= (unsigned long __user
*)data
;
830 /* read the word at location addr in the USER area. */
831 case PTRACE_PEEKUSR
: {
835 if ((addr
& (sizeof(data
) - 1)) || addr
>= sizeof(struct user
))
838 tmp
= 0; /* Default return condition */
839 if (addr
< sizeof(struct user_regs_struct
))
840 tmp
= getreg(child
, addr
);
841 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
842 addr
<= offsetof(struct user
, u_debugreg
[7])) {
843 addr
-= offsetof(struct user
, u_debugreg
[0]);
844 tmp
= ptrace_get_debugreg(child
, addr
/ sizeof(data
));
846 ret
= put_user(tmp
, datap
);
850 case PTRACE_POKEUSR
: /* write the word at location addr in the USER area */
852 if ((addr
& (sizeof(data
) - 1)) || addr
>= sizeof(struct user
))
855 if (addr
< sizeof(struct user_regs_struct
))
856 ret
= putreg(child
, addr
, data
);
857 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
858 addr
<= offsetof(struct user
, u_debugreg
[7])) {
859 addr
-= offsetof(struct user
, u_debugreg
[0]);
860 ret
= ptrace_set_debugreg(child
,
861 addr
/ sizeof(data
), data
);
865 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
866 return copy_regset_to_user(child
,
867 task_user_regset_view(current
),
869 0, sizeof(struct user_regs_struct
),
872 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
873 return copy_regset_from_user(child
,
874 task_user_regset_view(current
),
876 0, sizeof(struct user_regs_struct
),
879 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
880 return copy_regset_to_user(child
,
881 task_user_regset_view(current
),
883 0, sizeof(struct user_i387_struct
),
886 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
887 return copy_regset_from_user(child
,
888 task_user_regset_view(current
),
890 0, sizeof(struct user_i387_struct
),
894 case PTRACE_GETFPXREGS
: /* Get the child extended FPU state. */
895 return copy_regset_to_user(child
, &user_x86_32_view
,
897 0, sizeof(struct user_fxsr_struct
),
900 case PTRACE_SETFPXREGS
: /* Set the child extended FPU state. */
901 return copy_regset_from_user(child
, &user_x86_32_view
,
903 0, sizeof(struct user_fxsr_struct
),
907 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
908 case PTRACE_GET_THREAD_AREA
:
911 ret
= do_get_thread_area(child
, addr
,
912 (struct user_desc __user
*)data
);
915 case PTRACE_SET_THREAD_AREA
:
918 ret
= do_set_thread_area(child
, addr
,
919 (struct user_desc __user
*)data
, 0);
924 /* normal 64bit interface to access TLS data.
925 Works just like arch_prctl, except that the arguments
927 case PTRACE_ARCH_PRCTL
:
928 ret
= do_arch_prctl(child
, data
, addr
);
933 ret
= ptrace_request(child
, request
, addr
, data
);
940 #ifdef CONFIG_IA32_EMULATION
942 #include <linux/compat.h>
943 #include <linux/syscalls.h>
944 #include <asm/ia32.h>
945 #include <asm/user32.h>
948 case offsetof(struct user32, regs.l): \
949 regs->q = value; break
952 case offsetof(struct user32, regs.rs): \
953 return set_segment_reg(child, \
954 offsetof(struct user_regs_struct, rs), \
958 static int putreg32(struct task_struct
*child
, unsigned regno
, u32 value
)
960 struct pt_regs
*regs
= task_pt_regs(child
);
981 case offsetof(struct user32
, regs
.orig_eax
):
983 * A 32-bit debugger setting orig_eax means to restore
984 * the state of the task restarting a 32-bit syscall.
985 * Make sure we interpret the -ERESTART* codes correctly
986 * in case the task is not actually still sitting at the
987 * exit from a 32-bit syscall with TS_COMPAT still set.
989 regs
->orig_ax
= value
;
990 if (syscall_get_nr(child
, regs
) >= 0)
991 task_thread_info(child
)->status
|= TS_COMPAT
;
994 case offsetof(struct user32
, regs
.eflags
):
995 return set_flags(child
, value
);
997 case offsetof(struct user32
, u_debugreg
[0]) ...
998 offsetof(struct user32
, u_debugreg
[7]):
999 regno
-= offsetof(struct user32
, u_debugreg
[0]);
1000 return ptrace_set_debugreg(child
, regno
/ 4, value
);
1003 if (regno
> sizeof(struct user32
) || (regno
& 3))
1007 * Other dummy fields in the virtual user structure
1019 case offsetof(struct user32, regs.l): \
1020 *val = regs->q; break
1023 case offsetof(struct user32, regs.rs): \
1024 *val = get_segment_reg(child, \
1025 offsetof(struct user_regs_struct, rs)); \
1028 static int getreg32(struct task_struct
*child
, unsigned regno
, u32
*val
)
1030 struct pt_regs
*regs
= task_pt_regs(child
);
1048 R32(orig_eax
, orig_ax
);
1052 case offsetof(struct user32
, regs
.eflags
):
1053 *val
= get_flags(child
);
1056 case offsetof(struct user32
, u_debugreg
[0]) ...
1057 offsetof(struct user32
, u_debugreg
[7]):
1058 regno
-= offsetof(struct user32
, u_debugreg
[0]);
1059 *val
= ptrace_get_debugreg(child
, regno
/ 4);
1063 if (regno
> sizeof(struct user32
) || (regno
& 3))
1067 * Other dummy fields in the virtual user structure
1079 static int genregs32_get(struct task_struct
*target
,
1080 const struct user_regset
*regset
,
1081 unsigned int pos
, unsigned int count
,
1082 void *kbuf
, void __user
*ubuf
)
1085 compat_ulong_t
*k
= kbuf
;
1086 while (count
>= sizeof(*k
)) {
1087 getreg32(target
, pos
, k
++);
1088 count
-= sizeof(*k
);
1092 compat_ulong_t __user
*u
= ubuf
;
1093 while (count
>= sizeof(*u
)) {
1094 compat_ulong_t word
;
1095 getreg32(target
, pos
, &word
);
1096 if (__put_user(word
, u
++))
1098 count
-= sizeof(*u
);
1106 static int genregs32_set(struct task_struct
*target
,
1107 const struct user_regset
*regset
,
1108 unsigned int pos
, unsigned int count
,
1109 const void *kbuf
, const void __user
*ubuf
)
1113 const compat_ulong_t
*k
= kbuf
;
1114 while (count
>= sizeof(*k
) && !ret
) {
1115 ret
= putreg32(target
, pos
, *k
++);
1116 count
-= sizeof(*k
);
1120 const compat_ulong_t __user
*u
= ubuf
;
1121 while (count
>= sizeof(*u
) && !ret
) {
1122 compat_ulong_t word
;
1123 ret
= __get_user(word
, u
++);
1126 ret
= putreg32(target
, pos
, word
);
1127 count
-= sizeof(*u
);
1134 #ifdef CONFIG_X86_X32_ABI
1135 static long x32_arch_ptrace(struct task_struct
*child
,
1136 compat_long_t request
, compat_ulong_t caddr
,
1137 compat_ulong_t cdata
)
1139 unsigned long addr
= caddr
;
1140 unsigned long data
= cdata
;
1141 void __user
*datap
= compat_ptr(data
);
1145 /* Read 32bits at location addr in the USER area. Only allow
1146 to return the lower 32bits of segment and debug registers. */
1147 case PTRACE_PEEKUSR
: {
1151 if ((addr
& (sizeof(data
) - 1)) || addr
>= sizeof(struct user
) ||
1152 addr
< offsetof(struct user_regs_struct
, cs
))
1155 tmp
= 0; /* Default return condition */
1156 if (addr
< sizeof(struct user_regs_struct
))
1157 tmp
= getreg(child
, addr
);
1158 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
1159 addr
<= offsetof(struct user
, u_debugreg
[7])) {
1160 addr
-= offsetof(struct user
, u_debugreg
[0]);
1161 tmp
= ptrace_get_debugreg(child
, addr
/ sizeof(data
));
1163 ret
= put_user(tmp
, (__u32 __user
*)datap
);
1167 /* Write the word at location addr in the USER area. Only allow
1168 to update segment and debug registers with the upper 32bits
1170 case PTRACE_POKEUSR
:
1172 if ((addr
& (sizeof(data
) - 1)) || addr
>= sizeof(struct user
) ||
1173 addr
< offsetof(struct user_regs_struct
, cs
))
1176 if (addr
< sizeof(struct user_regs_struct
))
1177 ret
= putreg(child
, addr
, data
);
1178 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
1179 addr
<= offsetof(struct user
, u_debugreg
[7])) {
1180 addr
-= offsetof(struct user
, u_debugreg
[0]);
1181 ret
= ptrace_set_debugreg(child
,
1182 addr
/ sizeof(data
), data
);
1186 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
1187 return copy_regset_to_user(child
,
1188 task_user_regset_view(current
),
1190 0, sizeof(struct user_regs_struct
),
1193 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
1194 return copy_regset_from_user(child
,
1195 task_user_regset_view(current
),
1197 0, sizeof(struct user_regs_struct
),
1200 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
1201 return copy_regset_to_user(child
,
1202 task_user_regset_view(current
),
1204 0, sizeof(struct user_i387_struct
),
1207 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
1208 return copy_regset_from_user(child
,
1209 task_user_regset_view(current
),
1211 0, sizeof(struct user_i387_struct
),
1214 /* normal 64bit interface to access TLS data.
1215 Works just like arch_prctl, except that the arguments
1217 case PTRACE_ARCH_PRCTL
:
1218 return do_arch_prctl(child
, data
, addr
);
1221 return compat_ptrace_request(child
, request
, addr
, data
);
1228 long compat_arch_ptrace(struct task_struct
*child
, compat_long_t request
,
1229 compat_ulong_t caddr
, compat_ulong_t cdata
)
1231 unsigned long addr
= caddr
;
1232 unsigned long data
= cdata
;
1233 void __user
*datap
= compat_ptr(data
);
1237 #ifdef CONFIG_X86_X32_ABI
1238 if (!is_ia32_task())
1239 return x32_arch_ptrace(child
, request
, caddr
, cdata
);
1243 case PTRACE_PEEKUSR
:
1244 ret
= getreg32(child
, addr
, &val
);
1246 ret
= put_user(val
, (__u32 __user
*)datap
);
1249 case PTRACE_POKEUSR
:
1250 ret
= putreg32(child
, addr
, data
);
1253 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
1254 return copy_regset_to_user(child
, &user_x86_32_view
,
1256 0, sizeof(struct user_regs_struct32
),
1259 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
1260 return copy_regset_from_user(child
, &user_x86_32_view
,
1262 sizeof(struct user_regs_struct32
),
1265 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
1266 return copy_regset_to_user(child
, &user_x86_32_view
,
1268 sizeof(struct user_i387_ia32_struct
),
1271 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
1272 return copy_regset_from_user(
1273 child
, &user_x86_32_view
, REGSET_FP
,
1274 0, sizeof(struct user_i387_ia32_struct
), datap
);
1276 case PTRACE_GETFPXREGS
: /* Get the child extended FPU state. */
1277 return copy_regset_to_user(child
, &user_x86_32_view
,
1279 sizeof(struct user32_fxsr_struct
),
1282 case PTRACE_SETFPXREGS
: /* Set the child extended FPU state. */
1283 return copy_regset_from_user(child
, &user_x86_32_view
,
1285 sizeof(struct user32_fxsr_struct
),
1288 case PTRACE_GET_THREAD_AREA
:
1289 case PTRACE_SET_THREAD_AREA
:
1290 return arch_ptrace(child
, request
, addr
, data
);
1293 return compat_ptrace_request(child
, request
, addr
, data
);
1299 #endif /* CONFIG_IA32_EMULATION */
1301 #ifdef CONFIG_X86_64
1303 static struct user_regset x86_64_regsets
[] __read_mostly
= {
1304 [REGSET_GENERAL
] = {
1305 .core_note_type
= NT_PRSTATUS
,
1306 .n
= sizeof(struct user_regs_struct
) / sizeof(long),
1307 .size
= sizeof(long), .align
= sizeof(long),
1308 .get
= genregs_get
, .set
= genregs_set
1311 .core_note_type
= NT_PRFPREG
,
1312 .n
= sizeof(struct user_i387_struct
) / sizeof(long),
1313 .size
= sizeof(long), .align
= sizeof(long),
1314 .active
= xfpregs_active
, .get
= xfpregs_get
, .set
= xfpregs_set
1317 .core_note_type
= NT_X86_XSTATE
,
1318 .size
= sizeof(u64
), .align
= sizeof(u64
),
1319 .active
= xstateregs_active
, .get
= xstateregs_get
,
1320 .set
= xstateregs_set
1322 [REGSET_IOPERM64
] = {
1323 .core_note_type
= NT_386_IOPERM
,
1324 .n
= IO_BITMAP_LONGS
,
1325 .size
= sizeof(long), .align
= sizeof(long),
1326 .active
= ioperm_active
, .get
= ioperm_get
1330 static const struct user_regset_view user_x86_64_view
= {
1331 .name
= "x86_64", .e_machine
= EM_X86_64
,
1332 .regsets
= x86_64_regsets
, .n
= ARRAY_SIZE(x86_64_regsets
)
1335 #else /* CONFIG_X86_32 */
1337 #define user_regs_struct32 user_regs_struct
1338 #define genregs32_get genregs_get
1339 #define genregs32_set genregs_set
1341 #define user_i387_ia32_struct user_i387_struct
1342 #define user32_fxsr_struct user_fxsr_struct
1344 #endif /* CONFIG_X86_64 */
1346 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1347 static struct user_regset x86_32_regsets
[] __read_mostly
= {
1348 [REGSET_GENERAL
] = {
1349 .core_note_type
= NT_PRSTATUS
,
1350 .n
= sizeof(struct user_regs_struct32
) / sizeof(u32
),
1351 .size
= sizeof(u32
), .align
= sizeof(u32
),
1352 .get
= genregs32_get
, .set
= genregs32_set
1355 .core_note_type
= NT_PRFPREG
,
1356 .n
= sizeof(struct user_i387_ia32_struct
) / sizeof(u32
),
1357 .size
= sizeof(u32
), .align
= sizeof(u32
),
1358 .active
= fpregs_active
, .get
= fpregs_get
, .set
= fpregs_set
1361 .core_note_type
= NT_PRXFPREG
,
1362 .n
= sizeof(struct user32_fxsr_struct
) / sizeof(u32
),
1363 .size
= sizeof(u32
), .align
= sizeof(u32
),
1364 .active
= xfpregs_active
, .get
= xfpregs_get
, .set
= xfpregs_set
1367 .core_note_type
= NT_X86_XSTATE
,
1368 .size
= sizeof(u64
), .align
= sizeof(u64
),
1369 .active
= xstateregs_active
, .get
= xstateregs_get
,
1370 .set
= xstateregs_set
1373 .core_note_type
= NT_386_TLS
,
1374 .n
= GDT_ENTRY_TLS_ENTRIES
, .bias
= GDT_ENTRY_TLS_MIN
,
1375 .size
= sizeof(struct user_desc
),
1376 .align
= sizeof(struct user_desc
),
1377 .active
= regset_tls_active
,
1378 .get
= regset_tls_get
, .set
= regset_tls_set
1380 [REGSET_IOPERM32
] = {
1381 .core_note_type
= NT_386_IOPERM
,
1382 .n
= IO_BITMAP_BYTES
/ sizeof(u32
),
1383 .size
= sizeof(u32
), .align
= sizeof(u32
),
1384 .active
= ioperm_active
, .get
= ioperm_get
1388 static const struct user_regset_view user_x86_32_view
= {
1389 .name
= "i386", .e_machine
= EM_386
,
1390 .regsets
= x86_32_regsets
, .n
= ARRAY_SIZE(x86_32_regsets
)
1395 * This represents bytes 464..511 in the memory layout exported through
1396 * the REGSET_XSTATE interface.
1398 u64 xstate_fx_sw_bytes
[USER_XSTATE_FX_SW_WORDS
];
1400 void update_regset_xstate_info(unsigned int size
, u64 xstate_mask
)
1402 #ifdef CONFIG_X86_64
1403 x86_64_regsets
[REGSET_XSTATE
].n
= size
/ sizeof(u64
);
1405 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1406 x86_32_regsets
[REGSET_XSTATE
].n
= size
/ sizeof(u64
);
1408 xstate_fx_sw_bytes
[USER_XSTATE_XCR0_WORD
] = xstate_mask
;
1411 const struct user_regset_view
*task_user_regset_view(struct task_struct
*task
)
1413 #ifdef CONFIG_IA32_EMULATION
1414 if (test_tsk_thread_flag(task
, TIF_IA32
))
1416 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1417 return &user_x86_32_view
;
1419 #ifdef CONFIG_X86_64
1420 return &user_x86_64_view
;
1424 static void fill_sigtrap_info(struct task_struct
*tsk
,
1425 struct pt_regs
*regs
,
1426 int error_code
, int si_code
,
1427 struct siginfo
*info
)
1429 tsk
->thread
.trap_nr
= X86_TRAP_DB
;
1430 tsk
->thread
.error_code
= error_code
;
1432 memset(info
, 0, sizeof(*info
));
1433 info
->si_signo
= SIGTRAP
;
1434 info
->si_code
= si_code
;
1435 info
->si_addr
= user_mode_vm(regs
) ? (void __user
*)regs
->ip
: NULL
;
1438 void user_single_step_siginfo(struct task_struct
*tsk
,
1439 struct pt_regs
*regs
,
1440 struct siginfo
*info
)
1442 fill_sigtrap_info(tsk
, regs
, 0, TRAP_BRKPT
, info
);
1445 void send_sigtrap(struct task_struct
*tsk
, struct pt_regs
*regs
,
1446 int error_code
, int si_code
)
1448 struct siginfo info
;
1450 fill_sigtrap_info(tsk
, regs
, error_code
, si_code
, &info
);
1451 /* Send us the fake SIGTRAP */
1452 force_sig_info(SIGTRAP
, &info
, tsk
);
1456 #ifdef CONFIG_X86_32
1458 #elif defined CONFIG_IA32_EMULATION
1459 # define IS_IA32 is_compat_task()
1465 * We must return the syscall number to actually look up in the table.
1466 * This can be -1L to skip running any syscall at all.
1468 long syscall_trace_enter(struct pt_regs
*regs
)
1473 * If we stepped into a sysenter/syscall insn, it trapped in
1474 * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP.
1475 * If user-mode had set TF itself, then it's still clear from
1476 * do_debug() and we need to set it again to restore the user
1477 * state. If we entered on the slow path, TF was already set.
1479 if (test_thread_flag(TIF_SINGLESTEP
))
1480 regs
->flags
|= X86_EFLAGS_TF
;
1482 /* do the secure computing check first */
1483 secure_computing(regs
->orig_ax
);
1485 if (unlikely(test_thread_flag(TIF_SYSCALL_EMU
)))
1488 if ((ret
|| test_thread_flag(TIF_SYSCALL_TRACE
)) &&
1489 tracehook_report_syscall_entry(regs
))
1492 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT
)))
1493 trace_sys_enter(regs
, regs
->orig_ax
);
1496 audit_syscall_entry(AUDIT_ARCH_I386
,
1499 regs
->dx
, regs
->si
);
1500 #ifdef CONFIG_X86_64
1502 audit_syscall_entry(AUDIT_ARCH_X86_64
,
1505 regs
->dx
, regs
->r10
);
1508 return ret
?: regs
->orig_ax
;
1511 void syscall_trace_leave(struct pt_regs
*regs
)
1515 audit_syscall_exit(regs
);
1517 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT
)))
1518 trace_sys_exit(regs
, regs
->ax
);
1521 * If TIF_SYSCALL_EMU is set, we only get here because of
1522 * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP).
1523 * We already reported this syscall instruction in
1524 * syscall_trace_enter().
1526 step
= unlikely(test_thread_flag(TIF_SINGLESTEP
)) &&
1527 !test_thread_flag(TIF_SYSCALL_EMU
);
1528 if (step
|| test_thread_flag(TIF_SYSCALL_TRACE
))
1529 tracehook_report_syscall_exit(regs
, step
);