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>
9 #include <linux/sched/task_stack.h>
11 #include <linux/smp.h>
12 #include <linux/errno.h>
13 #include <linux/slab.h>
14 #include <linux/ptrace.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>
24 #include <linux/rcupdate.h>
25 #include <linux/export.h>
26 #include <linux/context_tracking.h>
28 #include <linux/uaccess.h>
29 #include <asm/pgtable.h>
30 #include <asm/processor.h>
31 #include <asm/fpu/internal.h>
32 #include <asm/fpu/signal.h>
33 #include <asm/fpu/regset.h>
34 #include <asm/debugreg.h>
37 #include <asm/prctl.h>
38 #include <asm/proto.h>
39 #include <asm/hw_breakpoint.h>
40 #include <asm/traps.h>
41 #include <asm/syscall.h>
49 REGSET_IOPERM64
= REGSET_XFP
,
55 struct pt_regs_offset
{
60 #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
61 #define REG_OFFSET_END {.name = NULL, .offset = 0}
63 static const struct pt_regs_offset regoffset_table
[] = {
87 REG_OFFSET_NAME(orig_ax
),
90 REG_OFFSET_NAME(flags
),
97 * regs_query_register_offset() - query register offset from its name
98 * @name: the name of a register
100 * regs_query_register_offset() returns the offset of a register in struct
101 * pt_regs from its name. If the name is invalid, this returns -EINVAL;
103 int regs_query_register_offset(const char *name
)
105 const struct pt_regs_offset
*roff
;
106 for (roff
= regoffset_table
; roff
->name
!= NULL
; roff
++)
107 if (!strcmp(roff
->name
, name
))
113 * regs_query_register_name() - query register name from its offset
114 * @offset: the offset of a register in struct pt_regs.
116 * regs_query_register_name() returns the name of a register from its
117 * offset in struct pt_regs. If the @offset is invalid, this returns NULL;
119 const char *regs_query_register_name(unsigned int offset
)
121 const struct pt_regs_offset
*roff
;
122 for (roff
= regoffset_table
; roff
->name
!= NULL
; roff
++)
123 if (roff
->offset
== offset
)
129 * does not yet catch signals sent when the child dies.
130 * in exit.c or in signal.c.
134 * Determines which flags the user has access to [1 = access, 0 = no access].
136 #define FLAG_MASK_32 ((unsigned long) \
137 (X86_EFLAGS_CF | X86_EFLAGS_PF | \
138 X86_EFLAGS_AF | X86_EFLAGS_ZF | \
139 X86_EFLAGS_SF | X86_EFLAGS_TF | \
140 X86_EFLAGS_DF | X86_EFLAGS_OF | \
141 X86_EFLAGS_RF | X86_EFLAGS_AC))
144 * Determines whether a value may be installed in a segment register.
146 static inline bool invalid_selector(u16 value
)
148 return unlikely(value
!= 0 && (value
& SEGMENT_RPL_MASK
) != USER_RPL
);
153 #define FLAG_MASK FLAG_MASK_32
156 * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode
157 * when it traps. The previous stack will be directly underneath the saved
158 * registers, and 'sp/ss' won't even have been saved. Thus the '®s->sp'.
160 * Now, if the stack is empty, '®s->sp' is out of range. In this
161 * case we try to take the previous stack. To always return a non-null
162 * stack pointer we fall back to regs as stack if no previous stack
165 * This is valid only for kernel mode traps.
167 unsigned long kernel_stack_pointer(struct pt_regs
*regs
)
169 unsigned long context
= (unsigned long)regs
& ~(THREAD_SIZE
- 1);
170 unsigned long sp
= (unsigned long)®s
->sp
;
173 if (context
== (sp
& ~(THREAD_SIZE
- 1)))
176 prev_esp
= (u32
*)(context
);
178 return (unsigned long)*prev_esp
;
180 return (unsigned long)regs
;
182 EXPORT_SYMBOL_GPL(kernel_stack_pointer
);
184 static unsigned long *pt_regs_access(struct pt_regs
*regs
, unsigned long regno
)
186 BUILD_BUG_ON(offsetof(struct pt_regs
, bx
) != 0);
187 return ®s
->bx
+ (regno
>> 2);
190 static u16
get_segment_reg(struct task_struct
*task
, unsigned long offset
)
193 * Returning the value truncates it to 16 bits.
196 if (offset
!= offsetof(struct user_regs_struct
, gs
))
197 retval
= *pt_regs_access(task_pt_regs(task
), offset
);
200 retval
= get_user_gs(task_pt_regs(task
));
202 retval
= task_user_gs(task
);
207 static int set_segment_reg(struct task_struct
*task
,
208 unsigned long offset
, u16 value
)
211 * The value argument was already truncated to 16 bits.
213 if (invalid_selector(value
))
217 * For %cs and %ss we cannot permit a null selector.
218 * We can permit a bogus selector as long as it has USER_RPL.
219 * Null selectors are fine for other segment registers, but
220 * we will never get back to user mode with invalid %cs or %ss
221 * and will take the trap in iret instead. Much code relies
222 * on user_mode() to distinguish a user trap frame (which can
223 * safely use invalid selectors) from a kernel trap frame.
226 case offsetof(struct user_regs_struct
, cs
):
227 case offsetof(struct user_regs_struct
, ss
):
228 if (unlikely(value
== 0))
232 *pt_regs_access(task_pt_regs(task
), offset
) = value
;
235 case offsetof(struct user_regs_struct
, gs
):
237 set_user_gs(task_pt_regs(task
), value
);
239 task_user_gs(task
) = value
;
245 #else /* CONFIG_X86_64 */
247 #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT)
249 static unsigned long *pt_regs_access(struct pt_regs
*regs
, unsigned long offset
)
251 BUILD_BUG_ON(offsetof(struct pt_regs
, r15
) != 0);
252 return ®s
->r15
+ (offset
/ sizeof(regs
->r15
));
255 static u16
get_segment_reg(struct task_struct
*task
, unsigned long offset
)
258 * Returning the value truncates it to 16 bits.
263 case offsetof(struct user_regs_struct
, fs
):
264 if (task
== current
) {
265 /* Older gas can't assemble movq %?s,%r?? */
266 asm("movl %%fs,%0" : "=r" (seg
));
269 return task
->thread
.fsindex
;
270 case offsetof(struct user_regs_struct
, gs
):
271 if (task
== current
) {
272 asm("movl %%gs,%0" : "=r" (seg
));
275 return task
->thread
.gsindex
;
276 case offsetof(struct user_regs_struct
, ds
):
277 if (task
== current
) {
278 asm("movl %%ds,%0" : "=r" (seg
));
281 return task
->thread
.ds
;
282 case offsetof(struct user_regs_struct
, es
):
283 if (task
== current
) {
284 asm("movl %%es,%0" : "=r" (seg
));
287 return task
->thread
.es
;
289 case offsetof(struct user_regs_struct
, cs
):
290 case offsetof(struct user_regs_struct
, ss
):
293 return *pt_regs_access(task_pt_regs(task
), offset
);
296 static int set_segment_reg(struct task_struct
*task
,
297 unsigned long offset
, u16 value
)
300 * The value argument was already truncated to 16 bits.
302 if (invalid_selector(value
))
306 case offsetof(struct user_regs_struct
,fs
):
307 task
->thread
.fsindex
= value
;
309 loadsegment(fs
, task
->thread
.fsindex
);
311 case offsetof(struct user_regs_struct
,gs
):
312 task
->thread
.gsindex
= value
;
314 load_gs_index(task
->thread
.gsindex
);
316 case offsetof(struct user_regs_struct
,ds
):
317 task
->thread
.ds
= value
;
319 loadsegment(ds
, task
->thread
.ds
);
321 case offsetof(struct user_regs_struct
,es
):
322 task
->thread
.es
= value
;
324 loadsegment(es
, task
->thread
.es
);
328 * Can't actually change these in 64-bit mode.
330 case offsetof(struct user_regs_struct
,cs
):
331 if (unlikely(value
== 0))
333 task_pt_regs(task
)->cs
= value
;
335 case offsetof(struct user_regs_struct
,ss
):
336 if (unlikely(value
== 0))
338 task_pt_regs(task
)->ss
= value
;
345 #endif /* CONFIG_X86_32 */
347 static unsigned long get_flags(struct task_struct
*task
)
349 unsigned long retval
= task_pt_regs(task
)->flags
;
352 * If the debugger set TF, hide it from the readout.
354 if (test_tsk_thread_flag(task
, TIF_FORCED_TF
))
355 retval
&= ~X86_EFLAGS_TF
;
360 static int set_flags(struct task_struct
*task
, unsigned long value
)
362 struct pt_regs
*regs
= task_pt_regs(task
);
365 * If the user value contains TF, mark that
366 * it was not "us" (the debugger) that set it.
367 * If not, make sure it stays set if we had.
369 if (value
& X86_EFLAGS_TF
)
370 clear_tsk_thread_flag(task
, TIF_FORCED_TF
);
371 else if (test_tsk_thread_flag(task
, TIF_FORCED_TF
))
372 value
|= X86_EFLAGS_TF
;
374 regs
->flags
= (regs
->flags
& ~FLAG_MASK
) | (value
& FLAG_MASK
);
379 static int putreg(struct task_struct
*child
,
380 unsigned long offset
, unsigned long value
)
383 case offsetof(struct user_regs_struct
, cs
):
384 case offsetof(struct user_regs_struct
, ds
):
385 case offsetof(struct user_regs_struct
, es
):
386 case offsetof(struct user_regs_struct
, fs
):
387 case offsetof(struct user_regs_struct
, gs
):
388 case offsetof(struct user_regs_struct
, ss
):
389 return set_segment_reg(child
, offset
, value
);
391 case offsetof(struct user_regs_struct
, flags
):
392 return set_flags(child
, value
);
395 case offsetof(struct user_regs_struct
,fs_base
):
396 if (value
>= TASK_SIZE_MAX
)
399 * When changing the segment base, use do_arch_prctl
400 * to set either thread.fs or thread.fsindex and the
401 * corresponding GDT slot.
403 if (child
->thread
.fsbase
!= value
)
404 return do_arch_prctl(child
, ARCH_SET_FS
, value
);
406 case offsetof(struct user_regs_struct
,gs_base
):
408 * Exactly the same here as the %fs handling above.
410 if (value
>= TASK_SIZE_MAX
)
412 if (child
->thread
.gsbase
!= value
)
413 return do_arch_prctl(child
, ARCH_SET_GS
, value
);
418 *pt_regs_access(task_pt_regs(child
), offset
) = value
;
422 static unsigned long getreg(struct task_struct
*task
, unsigned long offset
)
425 case offsetof(struct user_regs_struct
, cs
):
426 case offsetof(struct user_regs_struct
, ds
):
427 case offsetof(struct user_regs_struct
, es
):
428 case offsetof(struct user_regs_struct
, fs
):
429 case offsetof(struct user_regs_struct
, gs
):
430 case offsetof(struct user_regs_struct
, ss
):
431 return get_segment_reg(task
, offset
);
433 case offsetof(struct user_regs_struct
, flags
):
434 return get_flags(task
);
437 case offsetof(struct user_regs_struct
, fs_base
): {
439 * XXX: This will not behave as expected if called on
440 * current or if fsindex != 0.
442 return task
->thread
.fsbase
;
444 case offsetof(struct user_regs_struct
, gs_base
): {
446 * XXX: This will not behave as expected if called on
447 * current or if fsindex != 0.
449 return task
->thread
.gsbase
;
454 return *pt_regs_access(task_pt_regs(task
), offset
);
457 static int genregs_get(struct task_struct
*target
,
458 const struct user_regset
*regset
,
459 unsigned int pos
, unsigned int count
,
460 void *kbuf
, void __user
*ubuf
)
463 unsigned long *k
= kbuf
;
464 while (count
>= sizeof(*k
)) {
465 *k
++ = getreg(target
, pos
);
470 unsigned long __user
*u
= ubuf
;
471 while (count
>= sizeof(*u
)) {
472 if (__put_user(getreg(target
, pos
), u
++))
482 static int genregs_set(struct task_struct
*target
,
483 const struct user_regset
*regset
,
484 unsigned int pos
, unsigned int count
,
485 const void *kbuf
, const void __user
*ubuf
)
489 const unsigned long *k
= kbuf
;
490 while (count
>= sizeof(*k
) && !ret
) {
491 ret
= putreg(target
, pos
, *k
++);
496 const unsigned long __user
*u
= ubuf
;
497 while (count
>= sizeof(*u
) && !ret
) {
499 ret
= __get_user(word
, u
++);
502 ret
= putreg(target
, pos
, word
);
510 static void ptrace_triggered(struct perf_event
*bp
,
511 struct perf_sample_data
*data
,
512 struct pt_regs
*regs
)
515 struct thread_struct
*thread
= &(current
->thread
);
518 * Store in the virtual DR6 register the fact that the breakpoint
519 * was hit so the thread's debugger will see it.
521 for (i
= 0; i
< HBP_NUM
; i
++) {
522 if (thread
->ptrace_bps
[i
] == bp
)
526 thread
->debugreg6
|= (DR_TRAP0
<< i
);
530 * Walk through every ptrace breakpoints for this thread and
531 * build the dr7 value on top of their attributes.
534 static unsigned long ptrace_get_dr7(struct perf_event
*bp
[])
538 struct arch_hw_breakpoint
*info
;
540 for (i
= 0; i
< HBP_NUM
; i
++) {
541 if (bp
[i
] && !bp
[i
]->attr
.disabled
) {
542 info
= counter_arch_bp(bp
[i
]);
543 dr7
|= encode_dr7(i
, info
->len
, info
->type
);
550 static int ptrace_fill_bp_fields(struct perf_event_attr
*attr
,
551 int len
, int type
, bool disabled
)
553 int err
, bp_len
, bp_type
;
555 err
= arch_bp_generic_fields(len
, type
, &bp_len
, &bp_type
);
557 attr
->bp_len
= bp_len
;
558 attr
->bp_type
= bp_type
;
559 attr
->disabled
= disabled
;
565 static struct perf_event
*
566 ptrace_register_breakpoint(struct task_struct
*tsk
, int len
, int type
,
567 unsigned long addr
, bool disabled
)
569 struct perf_event_attr attr
;
572 ptrace_breakpoint_init(&attr
);
575 err
= ptrace_fill_bp_fields(&attr
, len
, type
, disabled
);
579 return register_user_hw_breakpoint(&attr
, ptrace_triggered
,
583 static int ptrace_modify_breakpoint(struct perf_event
*bp
, int len
, int type
,
586 struct perf_event_attr attr
= bp
->attr
;
589 err
= ptrace_fill_bp_fields(&attr
, len
, type
, disabled
);
593 return modify_user_hw_breakpoint(bp
, &attr
);
597 * Handle ptrace writes to debug register 7.
599 static int ptrace_write_dr7(struct task_struct
*tsk
, unsigned long data
)
601 struct thread_struct
*thread
= &tsk
->thread
;
602 unsigned long old_dr7
;
603 bool second_pass
= false;
606 data
&= ~DR_CONTROL_RESERVED
;
607 old_dr7
= ptrace_get_dr7(thread
->ptrace_bps
);
611 for (i
= 0; i
< HBP_NUM
; i
++) {
613 bool disabled
= !decode_dr7(data
, i
, &len
, &type
);
614 struct perf_event
*bp
= thread
->ptrace_bps
[i
];
620 bp
= ptrace_register_breakpoint(tsk
,
621 len
, type
, 0, disabled
);
627 thread
->ptrace_bps
[i
] = bp
;
631 rc
= ptrace_modify_breakpoint(bp
, len
, type
, disabled
);
636 /* Restore if the first pass failed, second_pass shouldn't fail. */
637 if (rc
&& !WARN_ON(second_pass
)) {
648 * Handle PTRACE_PEEKUSR calls for the debug register area.
650 static unsigned long ptrace_get_debugreg(struct task_struct
*tsk
, int n
)
652 struct thread_struct
*thread
= &tsk
->thread
;
653 unsigned long val
= 0;
656 struct perf_event
*bp
= thread
->ptrace_bps
[n
];
659 val
= bp
->hw
.info
.address
;
661 val
= thread
->debugreg6
;
663 val
= thread
->ptrace_dr7
;
668 static int ptrace_set_breakpoint_addr(struct task_struct
*tsk
, int nr
,
671 struct thread_struct
*t
= &tsk
->thread
;
672 struct perf_event
*bp
= t
->ptrace_bps
[nr
];
677 * Put stub len and type to create an inactive but correct bp.
679 * CHECKME: the previous code returned -EIO if the addr wasn't
680 * a valid task virtual addr. The new one will return -EINVAL in
682 * -EINVAL may be what we want for in-kernel breakpoints users,
683 * but -EIO looks better for ptrace, since we refuse a register
684 * writing for the user. And anyway this is the previous
687 bp
= ptrace_register_breakpoint(tsk
,
688 X86_BREAKPOINT_LEN_1
, X86_BREAKPOINT_WRITE
,
693 t
->ptrace_bps
[nr
] = bp
;
695 struct perf_event_attr attr
= bp
->attr
;
698 err
= modify_user_hw_breakpoint(bp
, &attr
);
705 * Handle PTRACE_POKEUSR calls for the debug register area.
707 static int ptrace_set_debugreg(struct task_struct
*tsk
, int n
,
710 struct thread_struct
*thread
= &tsk
->thread
;
711 /* There are no DR4 or DR5 registers */
715 rc
= ptrace_set_breakpoint_addr(tsk
, n
, val
);
717 thread
->debugreg6
= val
;
720 rc
= ptrace_write_dr7(tsk
, val
);
722 thread
->ptrace_dr7
= val
;
728 * These access the current or another (stopped) task's io permission
729 * bitmap for debugging or core dump.
731 static int ioperm_active(struct task_struct
*target
,
732 const struct user_regset
*regset
)
734 return target
->thread
.io_bitmap_max
/ regset
->size
;
737 static int ioperm_get(struct task_struct
*target
,
738 const struct user_regset
*regset
,
739 unsigned int pos
, unsigned int count
,
740 void *kbuf
, void __user
*ubuf
)
742 if (!target
->thread
.io_bitmap_ptr
)
745 return user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
,
746 target
->thread
.io_bitmap_ptr
,
751 * Called by kernel/ptrace.c when detaching..
753 * Make sure the single step bit is not set.
755 void ptrace_disable(struct task_struct
*child
)
757 user_disable_single_step(child
);
758 #ifdef TIF_SYSCALL_EMU
759 clear_tsk_thread_flag(child
, TIF_SYSCALL_EMU
);
763 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
764 static const struct user_regset_view user_x86_32_view
; /* Initialized below. */
767 long arch_ptrace(struct task_struct
*child
, long request
,
768 unsigned long addr
, unsigned long data
)
771 unsigned long __user
*datap
= (unsigned long __user
*)data
;
774 /* read the word at location addr in the USER area. */
775 case PTRACE_PEEKUSR
: {
779 if ((addr
& (sizeof(data
) - 1)) || addr
>= sizeof(struct user
))
782 tmp
= 0; /* Default return condition */
783 if (addr
< sizeof(struct user_regs_struct
))
784 tmp
= getreg(child
, addr
);
785 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
786 addr
<= offsetof(struct user
, u_debugreg
[7])) {
787 addr
-= offsetof(struct user
, u_debugreg
[0]);
788 tmp
= ptrace_get_debugreg(child
, addr
/ sizeof(data
));
790 ret
= put_user(tmp
, datap
);
794 case PTRACE_POKEUSR
: /* write the word at location addr in the USER area */
796 if ((addr
& (sizeof(data
) - 1)) || addr
>= sizeof(struct user
))
799 if (addr
< sizeof(struct user_regs_struct
))
800 ret
= putreg(child
, addr
, data
);
801 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
802 addr
<= offsetof(struct user
, u_debugreg
[7])) {
803 addr
-= offsetof(struct user
, u_debugreg
[0]);
804 ret
= ptrace_set_debugreg(child
,
805 addr
/ sizeof(data
), data
);
809 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
810 return copy_regset_to_user(child
,
811 task_user_regset_view(current
),
813 0, sizeof(struct user_regs_struct
),
816 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
817 return copy_regset_from_user(child
,
818 task_user_regset_view(current
),
820 0, sizeof(struct user_regs_struct
),
823 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
824 return copy_regset_to_user(child
,
825 task_user_regset_view(current
),
827 0, sizeof(struct user_i387_struct
),
830 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
831 return copy_regset_from_user(child
,
832 task_user_regset_view(current
),
834 0, sizeof(struct user_i387_struct
),
838 case PTRACE_GETFPXREGS
: /* Get the child extended FPU state. */
839 return copy_regset_to_user(child
, &user_x86_32_view
,
841 0, sizeof(struct user_fxsr_struct
),
844 case PTRACE_SETFPXREGS
: /* Set the child extended FPU state. */
845 return copy_regset_from_user(child
, &user_x86_32_view
,
847 0, sizeof(struct user_fxsr_struct
),
851 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
852 case PTRACE_GET_THREAD_AREA
:
855 ret
= do_get_thread_area(child
, addr
,
856 (struct user_desc __user
*)data
);
859 case PTRACE_SET_THREAD_AREA
:
862 ret
= do_set_thread_area(child
, addr
,
863 (struct user_desc __user
*)data
, 0);
868 /* normal 64bit interface to access TLS data.
869 Works just like arch_prctl, except that the arguments
871 case PTRACE_ARCH_PRCTL
:
872 ret
= do_arch_prctl(child
, data
, addr
);
877 ret
= ptrace_request(child
, request
, addr
, data
);
884 #ifdef CONFIG_IA32_EMULATION
886 #include <linux/compat.h>
887 #include <linux/syscalls.h>
888 #include <asm/ia32.h>
889 #include <asm/user32.h>
892 case offsetof(struct user32, regs.l): \
893 regs->q = value; break
896 case offsetof(struct user32, regs.rs): \
897 return set_segment_reg(child, \
898 offsetof(struct user_regs_struct, rs), \
902 static int putreg32(struct task_struct
*child
, unsigned regno
, u32 value
)
904 struct pt_regs
*regs
= task_pt_regs(child
);
925 case offsetof(struct user32
, regs
.orig_eax
):
927 * Warning: bizarre corner case fixup here. A 32-bit
928 * debugger setting orig_eax to -1 wants to disable
929 * syscall restart. Make sure that the syscall
930 * restart code sign-extends orig_ax. Also make sure
931 * we interpret the -ERESTART* codes correctly if
932 * loaded into regs->ax in case the task is not
933 * actually still sitting at the exit from a 32-bit
934 * syscall with TS_COMPAT still set.
936 regs
->orig_ax
= value
;
937 if (syscall_get_nr(child
, regs
) >= 0)
938 child
->thread
.status
|= TS_I386_REGS_POKED
;
941 case offsetof(struct user32
, regs
.eflags
):
942 return set_flags(child
, value
);
944 case offsetof(struct user32
, u_debugreg
[0]) ...
945 offsetof(struct user32
, u_debugreg
[7]):
946 regno
-= offsetof(struct user32
, u_debugreg
[0]);
947 return ptrace_set_debugreg(child
, regno
/ 4, value
);
950 if (regno
> sizeof(struct user32
) || (regno
& 3))
954 * Other dummy fields in the virtual user structure
966 case offsetof(struct user32, regs.l): \
967 *val = regs->q; break
970 case offsetof(struct user32, regs.rs): \
971 *val = get_segment_reg(child, \
972 offsetof(struct user_regs_struct, rs)); \
975 static int getreg32(struct task_struct
*child
, unsigned regno
, u32
*val
)
977 struct pt_regs
*regs
= task_pt_regs(child
);
995 R32(orig_eax
, orig_ax
);
999 case offsetof(struct user32
, regs
.eflags
):
1000 *val
= get_flags(child
);
1003 case offsetof(struct user32
, u_debugreg
[0]) ...
1004 offsetof(struct user32
, u_debugreg
[7]):
1005 regno
-= offsetof(struct user32
, u_debugreg
[0]);
1006 *val
= ptrace_get_debugreg(child
, regno
/ 4);
1010 if (regno
> sizeof(struct user32
) || (regno
& 3))
1014 * Other dummy fields in the virtual user structure
1026 static int genregs32_get(struct task_struct
*target
,
1027 const struct user_regset
*regset
,
1028 unsigned int pos
, unsigned int count
,
1029 void *kbuf
, void __user
*ubuf
)
1032 compat_ulong_t
*k
= kbuf
;
1033 while (count
>= sizeof(*k
)) {
1034 getreg32(target
, pos
, k
++);
1035 count
-= sizeof(*k
);
1039 compat_ulong_t __user
*u
= ubuf
;
1040 while (count
>= sizeof(*u
)) {
1041 compat_ulong_t word
;
1042 getreg32(target
, pos
, &word
);
1043 if (__put_user(word
, u
++))
1045 count
-= sizeof(*u
);
1053 static int genregs32_set(struct task_struct
*target
,
1054 const struct user_regset
*regset
,
1055 unsigned int pos
, unsigned int count
,
1056 const void *kbuf
, const void __user
*ubuf
)
1060 const compat_ulong_t
*k
= kbuf
;
1061 while (count
>= sizeof(*k
) && !ret
) {
1062 ret
= putreg32(target
, pos
, *k
++);
1063 count
-= sizeof(*k
);
1067 const compat_ulong_t __user
*u
= ubuf
;
1068 while (count
>= sizeof(*u
) && !ret
) {
1069 compat_ulong_t word
;
1070 ret
= __get_user(word
, u
++);
1073 ret
= putreg32(target
, pos
, word
);
1074 count
-= sizeof(*u
);
1081 static long ia32_arch_ptrace(struct task_struct
*child
, compat_long_t request
,
1082 compat_ulong_t caddr
, compat_ulong_t cdata
)
1084 unsigned long addr
= caddr
;
1085 unsigned long data
= cdata
;
1086 void __user
*datap
= compat_ptr(data
);
1091 case PTRACE_PEEKUSR
:
1092 ret
= getreg32(child
, addr
, &val
);
1094 ret
= put_user(val
, (__u32 __user
*)datap
);
1097 case PTRACE_POKEUSR
:
1098 ret
= putreg32(child
, addr
, data
);
1101 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
1102 return copy_regset_to_user(child
, &user_x86_32_view
,
1104 0, sizeof(struct user_regs_struct32
),
1107 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
1108 return copy_regset_from_user(child
, &user_x86_32_view
,
1110 sizeof(struct user_regs_struct32
),
1113 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
1114 return copy_regset_to_user(child
, &user_x86_32_view
,
1116 sizeof(struct user_i387_ia32_struct
),
1119 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
1120 return copy_regset_from_user(
1121 child
, &user_x86_32_view
, REGSET_FP
,
1122 0, sizeof(struct user_i387_ia32_struct
), datap
);
1124 case PTRACE_GETFPXREGS
: /* Get the child extended FPU state. */
1125 return copy_regset_to_user(child
, &user_x86_32_view
,
1127 sizeof(struct user32_fxsr_struct
),
1130 case PTRACE_SETFPXREGS
: /* Set the child extended FPU state. */
1131 return copy_regset_from_user(child
, &user_x86_32_view
,
1133 sizeof(struct user32_fxsr_struct
),
1136 case PTRACE_GET_THREAD_AREA
:
1137 case PTRACE_SET_THREAD_AREA
:
1138 return arch_ptrace(child
, request
, addr
, data
);
1141 return compat_ptrace_request(child
, request
, addr
, data
);
1146 #endif /* CONFIG_IA32_EMULATION */
1148 #ifdef CONFIG_X86_X32_ABI
1149 static long x32_arch_ptrace(struct task_struct
*child
,
1150 compat_long_t request
, compat_ulong_t caddr
,
1151 compat_ulong_t cdata
)
1153 unsigned long addr
= caddr
;
1154 unsigned long data
= cdata
;
1155 void __user
*datap
= compat_ptr(data
);
1159 /* Read 32bits at location addr in the USER area. Only allow
1160 to return the lower 32bits of segment and debug registers. */
1161 case PTRACE_PEEKUSR
: {
1165 if ((addr
& (sizeof(data
) - 1)) || addr
>= sizeof(struct user
) ||
1166 addr
< offsetof(struct user_regs_struct
, cs
))
1169 tmp
= 0; /* Default return condition */
1170 if (addr
< sizeof(struct user_regs_struct
))
1171 tmp
= getreg(child
, addr
);
1172 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
1173 addr
<= offsetof(struct user
, u_debugreg
[7])) {
1174 addr
-= offsetof(struct user
, u_debugreg
[0]);
1175 tmp
= ptrace_get_debugreg(child
, addr
/ sizeof(data
));
1177 ret
= put_user(tmp
, (__u32 __user
*)datap
);
1181 /* Write the word at location addr in the USER area. Only allow
1182 to update segment and debug registers with the upper 32bits
1184 case PTRACE_POKEUSR
:
1186 if ((addr
& (sizeof(data
) - 1)) || addr
>= sizeof(struct user
) ||
1187 addr
< offsetof(struct user_regs_struct
, cs
))
1190 if (addr
< sizeof(struct user_regs_struct
))
1191 ret
= putreg(child
, addr
, data
);
1192 else if (addr
>= offsetof(struct user
, u_debugreg
[0]) &&
1193 addr
<= offsetof(struct user
, u_debugreg
[7])) {
1194 addr
-= offsetof(struct user
, u_debugreg
[0]);
1195 ret
= ptrace_set_debugreg(child
,
1196 addr
/ sizeof(data
), data
);
1200 case PTRACE_GETREGS
: /* Get all gp regs from the child. */
1201 return copy_regset_to_user(child
,
1202 task_user_regset_view(current
),
1204 0, sizeof(struct user_regs_struct
),
1207 case PTRACE_SETREGS
: /* Set all gp regs in the child. */
1208 return copy_regset_from_user(child
,
1209 task_user_regset_view(current
),
1211 0, sizeof(struct user_regs_struct
),
1214 case PTRACE_GETFPREGS
: /* Get the child FPU state. */
1215 return copy_regset_to_user(child
,
1216 task_user_regset_view(current
),
1218 0, sizeof(struct user_i387_struct
),
1221 case PTRACE_SETFPREGS
: /* Set the child FPU state. */
1222 return copy_regset_from_user(child
,
1223 task_user_regset_view(current
),
1225 0, sizeof(struct user_i387_struct
),
1229 return compat_ptrace_request(child
, request
, addr
, data
);
1236 #ifdef CONFIG_COMPAT
1237 long compat_arch_ptrace(struct task_struct
*child
, compat_long_t request
,
1238 compat_ulong_t caddr
, compat_ulong_t cdata
)
1240 #ifdef CONFIG_X86_X32_ABI
1241 if (!in_ia32_syscall())
1242 return x32_arch_ptrace(child
, request
, caddr
, cdata
);
1244 #ifdef CONFIG_IA32_EMULATION
1245 return ia32_arch_ptrace(child
, request
, caddr
, cdata
);
1250 #endif /* CONFIG_COMPAT */
1252 #ifdef CONFIG_X86_64
1254 static struct user_regset x86_64_regsets
[] __ro_after_init
= {
1255 [REGSET_GENERAL
] = {
1256 .core_note_type
= NT_PRSTATUS
,
1257 .n
= sizeof(struct user_regs_struct
) / sizeof(long),
1258 .size
= sizeof(long), .align
= sizeof(long),
1259 .get
= genregs_get
, .set
= genregs_set
1262 .core_note_type
= NT_PRFPREG
,
1263 .n
= sizeof(struct user_i387_struct
) / sizeof(long),
1264 .size
= sizeof(long), .align
= sizeof(long),
1265 .active
= regset_xregset_fpregs_active
, .get
= xfpregs_get
, .set
= xfpregs_set
1268 .core_note_type
= NT_X86_XSTATE
,
1269 .size
= sizeof(u64
), .align
= sizeof(u64
),
1270 .active
= xstateregs_active
, .get
= xstateregs_get
,
1271 .set
= xstateregs_set
1273 [REGSET_IOPERM64
] = {
1274 .core_note_type
= NT_386_IOPERM
,
1275 .n
= IO_BITMAP_LONGS
,
1276 .size
= sizeof(long), .align
= sizeof(long),
1277 .active
= ioperm_active
, .get
= ioperm_get
1281 static const struct user_regset_view user_x86_64_view
= {
1282 .name
= "x86_64", .e_machine
= EM_X86_64
,
1283 .regsets
= x86_64_regsets
, .n
= ARRAY_SIZE(x86_64_regsets
)
1286 #else /* CONFIG_X86_32 */
1288 #define user_regs_struct32 user_regs_struct
1289 #define genregs32_get genregs_get
1290 #define genregs32_set genregs_set
1292 #endif /* CONFIG_X86_64 */
1294 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1295 static struct user_regset x86_32_regsets
[] __ro_after_init
= {
1296 [REGSET_GENERAL
] = {
1297 .core_note_type
= NT_PRSTATUS
,
1298 .n
= sizeof(struct user_regs_struct32
) / sizeof(u32
),
1299 .size
= sizeof(u32
), .align
= sizeof(u32
),
1300 .get
= genregs32_get
, .set
= genregs32_set
1303 .core_note_type
= NT_PRFPREG
,
1304 .n
= sizeof(struct user_i387_ia32_struct
) / sizeof(u32
),
1305 .size
= sizeof(u32
), .align
= sizeof(u32
),
1306 .active
= regset_fpregs_active
, .get
= fpregs_get
, .set
= fpregs_set
1309 .core_note_type
= NT_PRXFPREG
,
1310 .n
= sizeof(struct user32_fxsr_struct
) / sizeof(u32
),
1311 .size
= sizeof(u32
), .align
= sizeof(u32
),
1312 .active
= regset_xregset_fpregs_active
, .get
= xfpregs_get
, .set
= xfpregs_set
1315 .core_note_type
= NT_X86_XSTATE
,
1316 .size
= sizeof(u64
), .align
= sizeof(u64
),
1317 .active
= xstateregs_active
, .get
= xstateregs_get
,
1318 .set
= xstateregs_set
1321 .core_note_type
= NT_386_TLS
,
1322 .n
= GDT_ENTRY_TLS_ENTRIES
, .bias
= GDT_ENTRY_TLS_MIN
,
1323 .size
= sizeof(struct user_desc
),
1324 .align
= sizeof(struct user_desc
),
1325 .active
= regset_tls_active
,
1326 .get
= regset_tls_get
, .set
= regset_tls_set
1328 [REGSET_IOPERM32
] = {
1329 .core_note_type
= NT_386_IOPERM
,
1330 .n
= IO_BITMAP_BYTES
/ sizeof(u32
),
1331 .size
= sizeof(u32
), .align
= sizeof(u32
),
1332 .active
= ioperm_active
, .get
= ioperm_get
1336 static const struct user_regset_view user_x86_32_view
= {
1337 .name
= "i386", .e_machine
= EM_386
,
1338 .regsets
= x86_32_regsets
, .n
= ARRAY_SIZE(x86_32_regsets
)
1343 * This represents bytes 464..511 in the memory layout exported through
1344 * the REGSET_XSTATE interface.
1346 u64 xstate_fx_sw_bytes
[USER_XSTATE_FX_SW_WORDS
];
1348 void __init
update_regset_xstate_info(unsigned int size
, u64 xstate_mask
)
1350 #ifdef CONFIG_X86_64
1351 x86_64_regsets
[REGSET_XSTATE
].n
= size
/ sizeof(u64
);
1353 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1354 x86_32_regsets
[REGSET_XSTATE
].n
= size
/ sizeof(u64
);
1356 xstate_fx_sw_bytes
[USER_XSTATE_XCR0_WORD
] = xstate_mask
;
1359 const struct user_regset_view
*task_user_regset_view(struct task_struct
*task
)
1361 #ifdef CONFIG_IA32_EMULATION
1362 if (!user_64bit_mode(task_pt_regs(task
)))
1364 #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
1365 return &user_x86_32_view
;
1367 #ifdef CONFIG_X86_64
1368 return &user_x86_64_view
;
1372 static void fill_sigtrap_info(struct task_struct
*tsk
,
1373 struct pt_regs
*regs
,
1374 int error_code
, int si_code
,
1375 struct siginfo
*info
)
1377 tsk
->thread
.trap_nr
= X86_TRAP_DB
;
1378 tsk
->thread
.error_code
= error_code
;
1380 memset(info
, 0, sizeof(*info
));
1381 info
->si_signo
= SIGTRAP
;
1382 info
->si_code
= si_code
;
1383 info
->si_addr
= user_mode(regs
) ? (void __user
*)regs
->ip
: NULL
;
1386 void user_single_step_siginfo(struct task_struct
*tsk
,
1387 struct pt_regs
*regs
,
1388 struct siginfo
*info
)
1390 fill_sigtrap_info(tsk
, regs
, 0, TRAP_BRKPT
, info
);
1393 void send_sigtrap(struct task_struct
*tsk
, struct pt_regs
*regs
,
1394 int error_code
, int si_code
)
1396 struct siginfo info
;
1398 fill_sigtrap_info(tsk
, regs
, error_code
, si_code
, &info
);
1399 /* Send us the fake SIGTRAP */
1400 force_sig_info(SIGTRAP
, &info
, tsk
);