1 // SPDX-License-Identifier: GPL-2.0
3 * arch/sh/kernel/ptrace_64.c
5 * Copyright (C) 2000, 2001 Paolo Alberelli
6 * Copyright (C) 2003 - 2008 Paul Mundt
8 * Started from SH3/4 version:
9 * SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
11 * Original x86 implementation:
12 * By Ross Biro 1/23/92
13 * edited by Linus Torvalds
15 #include <linux/kernel.h>
16 #include <linux/rwsem.h>
17 #include <linux/sched.h>
18 #include <linux/sched/task_stack.h>
20 #include <linux/smp.h>
21 #include <linux/bitops.h>
22 #include <linux/errno.h>
23 #include <linux/ptrace.h>
24 #include <linux/user.h>
25 #include <linux/signal.h>
26 #include <linux/syscalls.h>
27 #include <linux/audit.h>
28 #include <linux/seccomp.h>
29 #include <linux/tracehook.h>
30 #include <linux/elf.h>
31 #include <linux/regset.h>
33 #include <linux/uaccess.h>
34 #include <asm/pgtable.h>
35 #include <asm/processor.h>
36 #include <asm/mmu_context.h>
37 #include <asm/syscalls.h>
39 #include <asm/traps.h>
41 #define CREATE_TRACE_POINTS
42 #include <trace/events/syscalls.h>
44 /* This mask defines the bits of the SR which the user is not allowed to
45 change, which are everything except S, Q, M, PR, SZ, FR. */
46 #define SR_MASK (0xffff8cfd)
49 * does not yet catch signals sent when the child dies.
50 * in exit.c or in signal.c.
54 * This routine will get a word from the user area in the process kernel stack.
56 static inline int get_stack_long(struct task_struct
*task
, int offset
)
60 stack
= (unsigned char *)(task
->thread
.uregs
);
62 return (*((int *)stack
));
65 static inline unsigned long
66 get_fpu_long(struct task_struct
*task
, unsigned long addr
)
70 regs
= (struct pt_regs
*)((unsigned char *)task
+ THREAD_SIZE
) - 1;
72 if (!tsk_used_math(task
)) {
73 if (addr
== offsetof(struct user_fpu_struct
, fpscr
)) {
76 tmp
= 0xffffffffUL
; /* matches initial value in fpu.c */
81 if (last_task_used_math
== task
) {
85 last_task_used_math
= 0;
89 tmp
= ((long *)task
->thread
.xstate
)[addr
/ sizeof(unsigned long)];
94 * This routine will put a word into the user area in the process kernel stack.
96 static inline int put_stack_long(struct task_struct
*task
, int offset
,
101 stack
= (unsigned char *)(task
->thread
.uregs
);
103 *(unsigned long *) stack
= data
;
108 put_fpu_long(struct task_struct
*task
, unsigned long addr
, unsigned long data
)
110 struct pt_regs
*regs
;
112 regs
= (struct pt_regs
*)((unsigned char *)task
+ THREAD_SIZE
) - 1;
114 if (!tsk_used_math(task
)) {
116 } else if (last_task_used_math
== task
) {
120 last_task_used_math
= 0;
124 ((long *)task
->thread
.xstate
)[addr
/ sizeof(unsigned long)] = data
;
128 void user_enable_single_step(struct task_struct
*child
)
130 struct pt_regs
*regs
= child
->thread
.uregs
;
132 regs
->sr
|= SR_SSTEP
; /* auto-resetting upon exception */
134 set_tsk_thread_flag(child
, TIF_SINGLESTEP
);
137 void user_disable_single_step(struct task_struct
*child
)
139 struct pt_regs
*regs
= child
->thread
.uregs
;
141 regs
->sr
&= ~SR_SSTEP
;
143 clear_tsk_thread_flag(child
, TIF_SINGLESTEP
);
146 static int genregs_get(struct task_struct
*target
,
147 const struct user_regset
*regset
,
148 unsigned int pos
, unsigned int count
,
149 void *kbuf
, void __user
*ubuf
)
151 const struct pt_regs
*regs
= task_pt_regs(target
);
154 /* PC, SR, SYSCALL */
155 ret
= user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
,
157 0, 3 * sizeof(unsigned long long));
161 ret
= user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
,
163 offsetof(struct pt_regs
, regs
[0]),
164 63 * sizeof(unsigned long long));
167 ret
= user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
,
169 offsetof(struct pt_regs
, tregs
[0]),
170 8 * sizeof(unsigned long long));
173 ret
= user_regset_copyout_zero(&pos
, &count
, &kbuf
, &ubuf
,
174 sizeof(struct pt_regs
), -1);
179 static int genregs_set(struct task_struct
*target
,
180 const struct user_regset
*regset
,
181 unsigned int pos
, unsigned int count
,
182 const void *kbuf
, const void __user
*ubuf
)
184 struct pt_regs
*regs
= task_pt_regs(target
);
187 /* PC, SR, SYSCALL */
188 ret
= user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
,
190 0, 3 * sizeof(unsigned long long));
193 if (!ret
&& count
> 0)
194 ret
= user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
,
196 offsetof(struct pt_regs
, regs
[0]),
197 63 * sizeof(unsigned long long));
200 if (!ret
&& count
> 0)
201 ret
= user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
,
203 offsetof(struct pt_regs
, tregs
[0]),
204 8 * sizeof(unsigned long long));
207 ret
= user_regset_copyin_ignore(&pos
, &count
, &kbuf
, &ubuf
,
208 sizeof(struct pt_regs
), -1);
214 int fpregs_get(struct task_struct
*target
,
215 const struct user_regset
*regset
,
216 unsigned int pos
, unsigned int count
,
217 void *kbuf
, void __user
*ubuf
)
221 ret
= init_fpu(target
);
225 return user_regset_copyout(&pos
, &count
, &kbuf
, &ubuf
,
226 &target
->thread
.xstate
->hardfpu
, 0, -1);
229 static int fpregs_set(struct task_struct
*target
,
230 const struct user_regset
*regset
,
231 unsigned int pos
, unsigned int count
,
232 const void *kbuf
, const void __user
*ubuf
)
236 ret
= init_fpu(target
);
240 set_stopped_child_used_math(target
);
242 return user_regset_copyin(&pos
, &count
, &kbuf
, &ubuf
,
243 &target
->thread
.xstate
->hardfpu
, 0, -1);
246 static int fpregs_active(struct task_struct
*target
,
247 const struct user_regset
*regset
)
249 return tsk_used_math(target
) ? regset
->n
: 0;
253 const struct pt_regs_offset regoffset_table
[] = {
256 REG_OFFSET_NAME(syscall_nr
),
267 REGS_OFFSET_NAME(10),
268 REGS_OFFSET_NAME(11),
269 REGS_OFFSET_NAME(12),
270 REGS_OFFSET_NAME(13),
271 REGS_OFFSET_NAME(14),
272 REGS_OFFSET_NAME(15),
273 REGS_OFFSET_NAME(16),
274 REGS_OFFSET_NAME(17),
275 REGS_OFFSET_NAME(18),
276 REGS_OFFSET_NAME(19),
277 REGS_OFFSET_NAME(20),
278 REGS_OFFSET_NAME(21),
279 REGS_OFFSET_NAME(22),
280 REGS_OFFSET_NAME(23),
281 REGS_OFFSET_NAME(24),
282 REGS_OFFSET_NAME(25),
283 REGS_OFFSET_NAME(26),
284 REGS_OFFSET_NAME(27),
285 REGS_OFFSET_NAME(28),
286 REGS_OFFSET_NAME(29),
287 REGS_OFFSET_NAME(30),
288 REGS_OFFSET_NAME(31),
289 REGS_OFFSET_NAME(32),
290 REGS_OFFSET_NAME(33),
291 REGS_OFFSET_NAME(34),
292 REGS_OFFSET_NAME(35),
293 REGS_OFFSET_NAME(36),
294 REGS_OFFSET_NAME(37),
295 REGS_OFFSET_NAME(38),
296 REGS_OFFSET_NAME(39),
297 REGS_OFFSET_NAME(40),
298 REGS_OFFSET_NAME(41),
299 REGS_OFFSET_NAME(42),
300 REGS_OFFSET_NAME(43),
301 REGS_OFFSET_NAME(44),
302 REGS_OFFSET_NAME(45),
303 REGS_OFFSET_NAME(46),
304 REGS_OFFSET_NAME(47),
305 REGS_OFFSET_NAME(48),
306 REGS_OFFSET_NAME(49),
307 REGS_OFFSET_NAME(50),
308 REGS_OFFSET_NAME(51),
309 REGS_OFFSET_NAME(52),
310 REGS_OFFSET_NAME(53),
311 REGS_OFFSET_NAME(54),
312 REGS_OFFSET_NAME(55),
313 REGS_OFFSET_NAME(56),
314 REGS_OFFSET_NAME(57),
315 REGS_OFFSET_NAME(58),
316 REGS_OFFSET_NAME(59),
317 REGS_OFFSET_NAME(60),
318 REGS_OFFSET_NAME(61),
319 REGS_OFFSET_NAME(62),
320 REGS_OFFSET_NAME(63),
321 TREGS_OFFSET_NAME(0),
322 TREGS_OFFSET_NAME(1),
323 TREGS_OFFSET_NAME(2),
324 TREGS_OFFSET_NAME(3),
325 TREGS_OFFSET_NAME(4),
326 TREGS_OFFSET_NAME(5),
327 TREGS_OFFSET_NAME(6),
328 TREGS_OFFSET_NAME(7),
333 * These are our native regset flavours.
342 static const struct user_regset sh_regsets
[] = {
350 .core_note_type
= NT_PRSTATUS
,
352 .size
= sizeof(long long),
353 .align
= sizeof(long long),
360 .core_note_type
= NT_PRFPREG
,
361 .n
= sizeof(struct user_fpu_struct
) /
363 .size
= sizeof(long long),
364 .align
= sizeof(long long),
367 .active
= fpregs_active
,
372 static const struct user_regset_view user_sh64_native_view
= {
375 .regsets
= sh_regsets
,
376 .n
= ARRAY_SIZE(sh_regsets
),
379 const struct user_regset_view
*task_user_regset_view(struct task_struct
*task
)
381 return &user_sh64_native_view
;
384 long arch_ptrace(struct task_struct
*child
, long request
,
385 unsigned long addr
, unsigned long data
)
388 unsigned long __user
*datap
= (unsigned long __user
*) data
;
391 /* read the word at location addr in the USER area. */
392 case PTRACE_PEEKUSR
: {
396 if ((addr
& 3) || addr
< 0)
399 if (addr
< sizeof(struct pt_regs
))
400 tmp
= get_stack_long(child
, addr
);
401 else if ((addr
>= offsetof(struct user
, fpu
)) &&
402 (addr
< offsetof(struct user
, u_fpvalid
))) {
404 ret
= init_fpu(child
);
407 index
= addr
- offsetof(struct user
, fpu
);
408 tmp
= get_fpu_long(child
, index
);
409 } else if (addr
== offsetof(struct user
, u_fpvalid
)) {
410 tmp
= !!tsk_used_math(child
);
414 ret
= put_user(tmp
, datap
);
419 /* write the word at location addr in the USER area. We must
420 disallow any changes to certain SR bits or u_fpvalid, since
421 this could crash the kernel or result in a security
424 if ((addr
& 3) || addr
< 0)
427 if (addr
< sizeof(struct pt_regs
)) {
428 /* Ignore change of top 32 bits of SR */
429 if (addr
== offsetof (struct pt_regs
, sr
)+4)
434 /* If lower 32 bits of SR, ignore non-user bits */
435 if (addr
== offsetof (struct pt_regs
, sr
))
437 long cursr
= get_stack_long(child
, addr
);
439 data
|= (cursr
& SR_MASK
);
441 ret
= put_stack_long(child
, addr
, data
);
443 else if ((addr
>= offsetof(struct user
, fpu
)) &&
444 (addr
< offsetof(struct user
, u_fpvalid
))) {
446 ret
= init_fpu(child
);
449 index
= addr
- offsetof(struct user
, fpu
);
450 ret
= put_fpu_long(child
, index
, data
);
455 return copy_regset_to_user(child
, &user_sh64_native_view
,
457 0, sizeof(struct pt_regs
),
460 return copy_regset_from_user(child
, &user_sh64_native_view
,
462 0, sizeof(struct pt_regs
),
465 case PTRACE_GETFPREGS
:
466 return copy_regset_to_user(child
, &user_sh64_native_view
,
468 0, sizeof(struct user_fpu_struct
),
470 case PTRACE_SETFPREGS
:
471 return copy_regset_from_user(child
, &user_sh64_native_view
,
473 0, sizeof(struct user_fpu_struct
),
477 ret
= ptrace_request(child
, request
, addr
, data
);
484 asmlinkage
int sh64_ptrace(long request
, long pid
,
485 unsigned long addr
, unsigned long data
)
487 #define WPC_DBRMODE 0x0d104008
488 static unsigned long first_call
;
490 if (!test_and_set_bit(0, &first_call
)) {
491 /* Set WPC.DBRMODE to 0. This makes all debug events get
492 * delivered through RESVEC, i.e. into the handlers in entry.S.
493 * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
494 * would normally be left set to 1, which makes debug events get
495 * delivered through DBRVEC, i.e. into the remote gdb's
496 * handlers. This prevents ptrace getting them, and confuses
497 * the remote gdb.) */
498 printk("DBRMODE set to 0 to permit native debugging\n");
499 poke_real_address_q(WPC_DBRMODE
, 0);
502 return sys_ptrace(request
, pid
, addr
, data
);
505 asmlinkage
long long do_syscall_trace_enter(struct pt_regs
*regs
)
509 secure_computing_strict(regs
->regs
[9]);
511 if (test_thread_flag(TIF_SYSCALL_TRACE
) &&
512 tracehook_report_syscall_entry(regs
))
514 * Tracing decided this syscall should not happen.
515 * We'll return a bogus call number to get an ENOSYS
516 * error, but leave the original number in regs->regs[0].
520 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT
)))
521 trace_sys_enter(regs
, regs
->regs
[9]);
523 audit_syscall_entry(regs
->regs
[1], regs
->regs
[2], regs
->regs
[3],
524 regs
->regs
[4], regs
->regs
[5]);
526 return ret
?: regs
->regs
[9];
529 asmlinkage
void do_syscall_trace_leave(struct pt_regs
*regs
)
533 audit_syscall_exit(regs
);
535 if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT
)))
536 trace_sys_exit(regs
, regs
->regs
[9]);
538 step
= test_thread_flag(TIF_SINGLESTEP
);
539 if (step
|| test_thread_flag(TIF_SYSCALL_TRACE
))
540 tracehook_report_syscall_exit(regs
, step
);
543 /* Called with interrupts disabled */
544 asmlinkage
void do_single_step(unsigned long long vec
, struct pt_regs
*regs
)
546 /* This is called after a single step exception (DEBUGSS).
547 There is no need to change the PC, as it is a post-execution
548 exception, as entry.S does not do anything to the PC for DEBUGSS.
549 We need to clear the Single Step setting in SR to avoid
550 continually stepping. */
552 regs
->sr
&= ~SR_SSTEP
;
556 /* Called with interrupts disabled */
557 BUILD_TRAP_HANDLER(breakpoint
)
561 /* We need to forward step the PC, to counteract the backstep done
569 * Called by kernel/ptrace.c when detaching..
571 * Make sure single step bits etc are not set.
573 void ptrace_disable(struct task_struct
*child
)
575 user_disable_single_step(child
);