2 * arch/sh/kernel/ptrace_64.c
4 * Copyright (C) 2000, 2001 Paolo Alberelli
5 * Copyright (C) 2003 - 2008 Paul Mundt
7 * Started from SH3/4 version:
8 * SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
10 * Original x86 implementation:
11 * By Ross Biro 1/23/92
12 * edited by Linus Torvalds
14 * This file is subject to the terms and conditions of the GNU General Public
15 * License. See the file "COPYING" in the main directory of this archive
18 #include <linux/kernel.h>
19 #include <linux/rwsem.h>
20 #include <linux/sched.h>
22 #include <linux/smp.h>
23 #include <linux/bitops.h>
24 #include <linux/errno.h>
25 #include <linux/ptrace.h>
26 #include <linux/user.h>
27 #include <linux/signal.h>
28 #include <linux/syscalls.h>
29 #include <linux/audit.h>
30 #include <linux/seccomp.h>
31 #include <linux/tracehook.h>
32 #include <linux/elf.h>
33 #include <linux/regset.h>
35 #include <asm/uaccess.h>
36 #include <asm/pgtable.h>
37 #include <asm/system.h>
38 #include <asm/processor.h>
39 #include <asm/mmu_context.h>
40 #include <asm/syscalls.h>
43 #define CREATE_TRACE_POINTS
44 #include <trace/events/syscalls.h>
46 /* This mask defines the bits of the SR which the user is not allowed to
47 change, which are everything except S, Q, M, PR, SZ, FR. */
48 #define SR_MASK (0xffff8cfd)
51 * does not yet catch signals sent when the child dies.
52 * in exit.c or in signal.c.
56 * This routine will get a word from the user area in the process kernel stack.
58 static inline int get_stack_long(struct task_struct
*task
, int offset
)
62 stack
= (unsigned char *)(task
->thread
.uregs
);
64 return (*((int *)stack
));
67 static inline unsigned long
68 get_fpu_long(struct task_struct
*task
, unsigned long addr
)
72 regs
= (struct pt_regs
*)((unsigned char *)task
+ THREAD_SIZE
) - 1;
74 if (!tsk_used_math(task
)) {
75 if (addr
== offsetof(struct user_fpu_struct
, fpscr
)) {
78 tmp
= 0xffffffffUL
; /* matches initial value in fpu.c */
83 if (last_task_used_math
== task
) {
87 last_task_used_math
= 0;
91 tmp
= ((long *)task
->thread
.xstate
)[addr
/ sizeof(unsigned long)];
96 * This routine will put a word into the user area in the process kernel stack.
98 static inline int put_stack_long(struct task_struct
*task
, int offset
,
101 unsigned char *stack
;
103 stack
= (unsigned char *)(task
->thread
.uregs
);
105 *(unsigned long *) stack
= data
;
110 put_fpu_long(struct task_struct
*task
, unsigned long addr
, unsigned long data
)
112 struct pt_regs
*regs
;
114 regs
= (struct pt_regs
*)((unsigned char *)task
+ THREAD_SIZE
) - 1;
116 if (!tsk_used_math(task
)) {
118 } else if (last_task_used_math
== task
) {
122 last_task_used_math
= 0;
126 ((long *)task
->thread
.xstate
)[addr
/ sizeof(unsigned long)] = data
;
130 void user_enable_single_step(struct task_struct
*child
)
132 struct pt_regs
*regs
= child
->thread
.uregs
;
134 regs
->sr
|= SR_SSTEP
; /* auto-resetting upon exception */
136 set_tsk_thread_flag(child
, TIF_SINGLESTEP
);
139 void user_disable_single_step(struct task_struct
*child
)
141 struct pt_regs
*regs
= child
->thread
.uregs
;
143 regs
->sr
&= ~SR_SSTEP
;
145 clear_tsk_thread_flag(child
, TIF_SINGLESTEP
);
148 static int genregs_get(struct task_struct
*target
,
149 const struct user_regset
*regset
,
150 unsigned int pos
, unsigned int count
,
151 void *kbuf
, void __user
*ubuf
)
153 const struct pt_regs
*regs
= task_pt_regs(target
);
156 /* PC, SR, SYSCALL */
157 ret
= user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
,
159 0, 3 * sizeof(unsigned long long));
163 ret
= user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
,
165 offsetof(struct pt_regs
, regs
[0]),
166 63 * sizeof(unsigned long long));
169 ret
= user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
,
171 offsetof(struct pt_regs
, tregs
[0]),
172 8 * sizeof(unsigned long long));
175 ret
= user_regset_copyout_zero(&pos
, &count
, &kbuf
, &ubuf
,
176 sizeof(struct pt_regs
), -1);
181 static int genregs_set(struct task_struct
*target
,
182 const struct user_regset
*regset
,
183 unsigned int pos
, unsigned int count
,
184 const void *kbuf
, const void __user
*ubuf
)
186 struct pt_regs
*regs
= task_pt_regs(target
);
189 /* PC, SR, SYSCALL */
190 ret
= user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
,
192 0, 3 * sizeof(unsigned long long));
195 if (!ret
&& count
> 0)
196 ret
= user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
,
198 offsetof(struct pt_regs
, regs
[0]),
199 63 * sizeof(unsigned long long));
202 if (!ret
&& count
> 0)
203 ret
= user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
,
205 offsetof(struct pt_regs
, tregs
[0]),
206 8 * sizeof(unsigned long long));
209 ret
= user_regset_copyin_ignore(&pos
, &count
, &kbuf
, &ubuf
,
210 sizeof(struct pt_regs
), -1);
216 int fpregs_get(struct task_struct
*target
,
217 const struct user_regset
*regset
,
218 unsigned int pos
, unsigned int count
,
219 void *kbuf
, void __user
*ubuf
)
223 ret
= init_fpu(target
);
227 return user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
,
228 &target
->thread
.xstate
->hardfpu
, 0, -1);
231 static int fpregs_set(struct task_struct
*target
,
232 const struct user_regset
*regset
,
233 unsigned int pos
, unsigned int count
,
234 const void *kbuf
, const void __user
*ubuf
)
238 ret
= init_fpu(target
);
242 set_stopped_child_used_math(target
);
244 return user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
,
245 &target
->thread
.xstate
->hardfpu
, 0, -1);
248 static int fpregs_active(struct task_struct
*target
,
249 const struct user_regset
*regset
)
251 return tsk_used_math(target
) ? regset
->n
: 0;
255 const struct pt_regs_offset regoffset_table
[] = {
258 REG_OFFSET_NAME(syscall_nr
),
269 REGS_OFFSET_NAME(10),
270 REGS_OFFSET_NAME(11),
271 REGS_OFFSET_NAME(12),
272 REGS_OFFSET_NAME(13),
273 REGS_OFFSET_NAME(14),
274 REGS_OFFSET_NAME(15),
275 REGS_OFFSET_NAME(16),
276 REGS_OFFSET_NAME(17),
277 REGS_OFFSET_NAME(18),
278 REGS_OFFSET_NAME(19),
279 REGS_OFFSET_NAME(20),
280 REGS_OFFSET_NAME(21),
281 REGS_OFFSET_NAME(22),
282 REGS_OFFSET_NAME(23),
283 REGS_OFFSET_NAME(24),
284 REGS_OFFSET_NAME(25),
285 REGS_OFFSET_NAME(26),
286 REGS_OFFSET_NAME(27),
287 REGS_OFFSET_NAME(28),
288 REGS_OFFSET_NAME(29),
289 REGS_OFFSET_NAME(30),
290 REGS_OFFSET_NAME(31),
291 REGS_OFFSET_NAME(32),
292 REGS_OFFSET_NAME(33),
293 REGS_OFFSET_NAME(34),
294 REGS_OFFSET_NAME(35),
295 REGS_OFFSET_NAME(36),
296 REGS_OFFSET_NAME(37),
297 REGS_OFFSET_NAME(38),
298 REGS_OFFSET_NAME(39),
299 REGS_OFFSET_NAME(40),
300 REGS_OFFSET_NAME(41),
301 REGS_OFFSET_NAME(42),
302 REGS_OFFSET_NAME(43),
303 REGS_OFFSET_NAME(44),
304 REGS_OFFSET_NAME(45),
305 REGS_OFFSET_NAME(46),
306 REGS_OFFSET_NAME(47),
307 REGS_OFFSET_NAME(48),
308 REGS_OFFSET_NAME(49),
309 REGS_OFFSET_NAME(50),
310 REGS_OFFSET_NAME(51),
311 REGS_OFFSET_NAME(52),
312 REGS_OFFSET_NAME(53),
313 REGS_OFFSET_NAME(54),
314 REGS_OFFSET_NAME(55),
315 REGS_OFFSET_NAME(56),
316 REGS_OFFSET_NAME(57),
317 REGS_OFFSET_NAME(58),
318 REGS_OFFSET_NAME(59),
319 REGS_OFFSET_NAME(60),
320 REGS_OFFSET_NAME(61),
321 REGS_OFFSET_NAME(62),
322 REGS_OFFSET_NAME(63),
323 TREGS_OFFSET_NAME(0),
324 TREGS_OFFSET_NAME(1),
325 TREGS_OFFSET_NAME(2),
326 TREGS_OFFSET_NAME(3),
327 TREGS_OFFSET_NAME(4),
328 TREGS_OFFSET_NAME(5),
329 TREGS_OFFSET_NAME(6),
330 TREGS_OFFSET_NAME(7),
335 * These are our native regset flavours.
344 static const struct user_regset sh_regsets
[] = {
352 .core_note_type
= NT_PRSTATUS
,
354 .size
= sizeof(long long),
355 .align
= sizeof(long long),
362 .core_note_type
= NT_PRFPREG
,
363 .n
= sizeof(struct user_fpu_struct
) /
365 .size
= sizeof(long long),
366 .align
= sizeof(long long),
369 .active
= fpregs_active
,
374 static const struct user_regset_view user_sh64_native_view
= {
377 .regsets
= sh_regsets
,
378 .n
= ARRAY_SIZE(sh_regsets
),
381 const struct user_regset_view
*task_user_regset_view(struct task_struct
*task
)
383 return &user_sh64_native_view
;
386 long arch_ptrace(struct task_struct
*child
, long request
,
387 unsigned long addr
, unsigned long data
)
390 unsigned long __user
*datap
= (unsigned long __user
*) data
;
393 /* read the word at location addr in the USER area. */
394 case PTRACE_PEEKUSR
: {
398 if ((addr
& 3) || addr
< 0)
401 if (addr
< sizeof(struct pt_regs
))
402 tmp
= get_stack_long(child
, addr
);
403 else if ((addr
>= offsetof(struct user
, fpu
)) &&
404 (addr
< offsetof(struct user
, u_fpvalid
))) {
406 ret
= init_fpu(child
);
409 index
= addr
- offsetof(struct user
, fpu
);
410 tmp
= get_fpu_long(child
, index
);
411 } else if (addr
== offsetof(struct user
, u_fpvalid
)) {
412 tmp
= !!tsk_used_math(child
);
416 ret
= put_user(tmp
, datap
);
421 /* write the word at location addr in the USER area. We must
422 disallow any changes to certain SR bits or u_fpvalid, since
423 this could crash the kernel or result in a security
426 if ((addr
& 3) || addr
< 0)
429 if (addr
< sizeof(struct pt_regs
)) {
430 /* Ignore change of top 32 bits of SR */
431 if (addr
== offsetof (struct pt_regs
, sr
)+4)
436 /* If lower 32 bits of SR, ignore non-user bits */
437 if (addr
== offsetof (struct pt_regs
, sr
))
439 long cursr
= get_stack_long(child
, addr
);
441 data
|= (cursr
& SR_MASK
);
443 ret
= put_stack_long(child
, addr
, data
);
445 else if ((addr
>= offsetof(struct user
, fpu
)) &&
446 (addr
< offsetof(struct user
, u_fpvalid
))) {
448 ret
= init_fpu(child
);
451 index
= addr
- offsetof(struct user
, fpu
);
452 ret
= put_fpu_long(child
, index
, data
);
457 return copy_regset_to_user(child
, &user_sh64_native_view
,
459 0, sizeof(struct pt_regs
),
462 return copy_regset_from_user(child
, &user_sh64_native_view
,
464 0, sizeof(struct pt_regs
),
467 case PTRACE_GETFPREGS
:
468 return copy_regset_to_user(child
, &user_sh64_native_view
,
470 0, sizeof(struct user_fpu_struct
),
472 case PTRACE_SETFPREGS
:
473 return copy_regset_from_user(child
, &user_sh64_native_view
,
475 0, sizeof(struct user_fpu_struct
),
479 ret
= ptrace_request(child
, request
, addr
, data
);
486 asmlinkage
int sh64_ptrace(long request
, long pid
,
487 unsigned long addr
, unsigned long data
)
489 #define WPC_DBRMODE 0x0d104008
490 static unsigned long first_call
;
492 if (!test_and_set_bit(0, &first_call
)) {
493 /* Set WPC.DBRMODE to 0. This makes all debug events get
494 * delivered through RESVEC, i.e. into the handlers in entry.S.
495 * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
496 * would normally be left set to 1, which makes debug events get
497 * delivered through DBRVEC, i.e. into the remote gdb's
498 * handlers. This prevents ptrace getting them, and confuses
499 * the remote gdb.) */
500 printk("DBRMODE set to 0 to permit native debugging\n");
501 poke_real_address_q(WPC_DBRMODE
, 0);
504 return sys_ptrace(request
, pid
, addr
, data
);
507 static inline int audit_arch(void)
512 arch
|= __AUDIT_ARCH_64BIT
;
514 #ifdef CONFIG_CPU_LITTLE_ENDIAN
515 arch
|= __AUDIT_ARCH_LE
;
521 asmlinkage
long long do_syscall_trace_enter(struct pt_regs
*regs
)
525 secure_computing(regs
->regs
[9]);
527 if (test_thread_flag(TIF_SYSCALL_TRACE
) &&
528 tracehook_report_syscall_entry(regs
))
530 * Tracing decided this syscall should not happen.
531 * We'll return a bogus call number to get an ENOSYS
532 * error, but leave the original number in regs->regs[0].
536 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT
)))
537 trace_sys_enter(regs
, regs
->regs
[9]);
539 audit_syscall_entry(audit_arch(), regs
->regs
[1],
540 regs
->regs
[2], regs
->regs
[3],
541 regs
->regs
[4], regs
->regs
[5]);
543 return ret
?: regs
->regs
[9];
546 asmlinkage
void do_syscall_trace_leave(struct pt_regs
*regs
)
550 audit_syscall_exit(regs
);
552 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT
)))
553 trace_sys_exit(regs
, regs
->regs
[9]);
555 step
= test_thread_flag(TIF_SINGLESTEP
);
556 if (step
|| test_thread_flag(TIF_SYSCALL_TRACE
))
557 tracehook_report_syscall_exit(regs
, step
);
560 /* Called with interrupts disabled */
561 asmlinkage
void do_single_step(unsigned long long vec
, struct pt_regs
*regs
)
563 /* This is called after a single step exception (DEBUGSS).
564 There is no need to change the PC, as it is a post-execution
565 exception, as entry.S does not do anything to the PC for DEBUGSS.
566 We need to clear the Single Step setting in SR to avoid
567 continually stepping. */
569 regs
->sr
&= ~SR_SSTEP
;
570 force_sig(SIGTRAP
, current
);
573 /* Called with interrupts disabled */
574 BUILD_TRAP_HANDLER(breakpoint
)
578 /* We need to forward step the PC, to counteract the backstep done
581 force_sig(SIGTRAP
, current
);
586 * Called by kernel/ptrace.c when detaching..
588 * Make sure single step bits etc are not set.
590 void ptrace_disable(struct task_struct
*child
)
592 user_disable_single_step(child
);