1 /* ptrace.c: Sparc process tracing support.
3 * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu)
4 * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6 * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
9 * Added Linux support -miguel (weird, eh?, the original code was meant
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
16 #include <linux/errno.h>
17 #include <linux/ptrace.h>
18 #include <linux/user.h>
19 #include <linux/smp.h>
20 #include <linux/smp_lock.h>
21 #include <linux/security.h>
22 #include <linux/seccomp.h>
23 #include <linux/audit.h>
24 #include <linux/signal.h>
27 #include <asm/pgtable.h>
28 #include <asm/system.h>
29 #include <asm/uaccess.h>
30 #include <asm/psrcompat.h>
31 #include <asm/visasm.h>
32 #include <asm/spitfire.h>
34 #include <asm/cpudata.h>
36 /* Returning from ptrace is a bit tricky because the syscall return
37 * low level code assumes any value returned which is negative and
38 * is a valid errno will mean setting the condition codes to indicate
39 * an error return. This doesn't work, so we have this hook.
41 static inline void pt_error_return(struct pt_regs
*regs
, unsigned long error
)
43 regs
->u_regs
[UREG_I0
] = error
;
44 regs
->tstate
|= (TSTATE_ICARRY
| TSTATE_XCARRY
);
45 regs
->tpc
= regs
->tnpc
;
49 static inline void pt_succ_return(struct pt_regs
*regs
, unsigned long value
)
51 regs
->u_regs
[UREG_I0
] = value
;
52 regs
->tstate
&= ~(TSTATE_ICARRY
| TSTATE_XCARRY
);
53 regs
->tpc
= regs
->tnpc
;
58 pt_succ_return_linux(struct pt_regs
*regs
, unsigned long value
, void __user
*addr
)
60 if (test_thread_flag(TIF_32BIT
)) {
61 if (put_user(value
, (unsigned int __user
*) addr
)) {
62 pt_error_return(regs
, EFAULT
);
66 if (put_user(value
, (long __user
*) addr
)) {
67 pt_error_return(regs
, EFAULT
);
71 regs
->u_regs
[UREG_I0
] = 0;
72 regs
->tstate
&= ~(TSTATE_ICARRY
| TSTATE_XCARRY
);
73 regs
->tpc
= regs
->tnpc
;
78 pt_os_succ_return (struct pt_regs
*regs
, unsigned long val
, void __user
*addr
)
80 if (current
->personality
== PER_SUNOS
)
81 pt_succ_return (regs
, val
);
83 pt_succ_return_linux (regs
, val
, addr
);
86 /* #define ALLOW_INIT_TRACING */
87 /* #define DEBUG_PTRACE */
91 /* 0 */ "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR",
92 /* 4 */ "POKETEXT", "POKEDATA", "POKEUSR", "CONT",
93 /* 8 */ "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH",
94 /* 12 */ "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS",
95 /* 16 */ "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT",
96 /* 20 */ "GETFPAREGS", "SETFPAREGS", "unknown", "unknown",
97 /* 24 */ "SYSCALL", ""
102 * Called by kernel/ptrace.c when detaching..
104 * Make sure single step bits etc are not set.
106 void ptrace_disable(struct task_struct
*child
)
111 /* To get the necessary page struct, access_process_vm() first calls
112 * get_user_pages(). This has done a flush_dcache_page() on the
113 * accessed page. Then our caller (copy_{to,from}_user_page()) did
114 * to memcpy to read/write the data from that page.
116 * Now, the only thing we have to do is:
117 * 1) flush the D-cache if it's possible than an illegal alias
119 * 2) flush the I-cache if this is pre-cheetah and we did a write
121 void flush_ptrace_access(struct vm_area_struct
*vma
, struct page
*page
,
122 unsigned long uaddr
, void *kaddr
,
123 unsigned long len
, int write
)
125 BUG_ON(len
> PAGE_SIZE
);
127 #ifdef DCACHE_ALIASING_POSSIBLE
128 /* If bit 13 of the kernel address we used to access the
129 * user page is the same as the virtual address that page
130 * is mapped to in the user's address space, we can skip the
133 if ((uaddr
^ (unsigned long) kaddr
) & (1UL << 13)) {
134 unsigned long start
= __pa(kaddr
);
135 unsigned long end
= start
+ len
;
136 unsigned long dcache_line_size
;
138 dcache_line_size
= local_cpu_data().dcache_line_size
;
140 if (tlb_type
== spitfire
) {
141 for (; start
< end
; start
+= dcache_line_size
)
142 spitfire_put_dcache_tag(start
& 0x3fe0, 0x0);
144 start
&= ~(dcache_line_size
- 1);
145 for (; start
< end
; start
+= dcache_line_size
)
146 __asm__
__volatile__(
147 "stxa %%g0, [%0] %1\n\t"
151 "i" (ASI_DCACHE_INVALIDATE
));
155 if (write
&& tlb_type
== spitfire
) {
156 unsigned long start
= (unsigned long) kaddr
;
157 unsigned long end
= start
+ len
;
158 unsigned long icache_line_size
;
160 icache_line_size
= local_cpu_data().icache_line_size
;
162 for (; start
< end
; start
+= icache_line_size
)
167 asmlinkage
void do_ptrace(struct pt_regs
*regs
)
169 int request
= regs
->u_regs
[UREG_I0
];
170 pid_t pid
= regs
->u_regs
[UREG_I1
];
171 unsigned long addr
= regs
->u_regs
[UREG_I2
];
172 unsigned long data
= regs
->u_regs
[UREG_I3
];
173 unsigned long addr2
= regs
->u_regs
[UREG_I4
];
174 struct task_struct
*child
;
177 if (test_thread_flag(TIF_32BIT
)) {
178 addr
&= 0xffffffffUL
;
179 data
&= 0xffffffffUL
;
180 addr2
&= 0xffffffffUL
;
187 if ((request
>= 0) && (request
<= 24))
192 if (request
== PTRACE_POKEDATA
&& data
== 0x91d02001){
193 printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n",
196 printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n",
197 s
, request
, pid
, addr
, data
, addr2
);
200 if (request
== PTRACE_TRACEME
) {
201 ret
= ptrace_traceme();
202 pt_succ_return(regs
, 0);
206 child
= ptrace_get_task_struct(pid
);
208 ret
= PTR_ERR(child
);
209 pt_error_return(regs
, -ret
);
213 if ((current
->personality
== PER_SUNOS
&& request
== PTRACE_SUNATTACH
)
214 || (current
->personality
!= PER_SUNOS
&& request
== PTRACE_ATTACH
)) {
215 if (ptrace_attach(child
)) {
216 pt_error_return(regs
, EPERM
);
219 pt_succ_return(regs
, 0);
223 ret
= ptrace_check_attach(child
, request
== PTRACE_KILL
);
225 pt_error_return(regs
, -ret
);
229 if (!(test_thread_flag(TIF_32BIT
)) &&
230 ((request
== PTRACE_READDATA64
) ||
231 (request
== PTRACE_WRITEDATA64
) ||
232 (request
== PTRACE_READTEXT64
) ||
233 (request
== PTRACE_WRITETEXT64
) ||
234 (request
== PTRACE_PEEKTEXT64
) ||
235 (request
== PTRACE_POKETEXT64
) ||
236 (request
== PTRACE_PEEKDATA64
) ||
237 (request
== PTRACE_POKEDATA64
))) {
238 addr
= regs
->u_regs
[UREG_G2
];
239 addr2
= regs
->u_regs
[UREG_G3
];
240 request
-= 30; /* wheee... */
244 case PTRACE_PEEKTEXT
: /* read word at location addr. */
245 case PTRACE_PEEKDATA
: {
251 if (test_thread_flag(TIF_32BIT
)) {
252 copied
= access_process_vm(child
, addr
,
253 &tmp32
, sizeof(tmp32
), 0);
254 tmp64
= (unsigned long) tmp32
;
255 if (copied
== sizeof(tmp32
))
258 copied
= access_process_vm(child
, addr
,
259 &tmp64
, sizeof(tmp64
), 0);
260 if (copied
== sizeof(tmp64
))
264 pt_error_return(regs
, -res
);
266 pt_os_succ_return(regs
, tmp64
, (void __user
*) data
);
270 case PTRACE_POKETEXT
: /* write the word at location addr. */
271 case PTRACE_POKEDATA
: {
274 int copied
, res
= -EIO
;
276 if (test_thread_flag(TIF_32BIT
)) {
278 copied
= access_process_vm(child
, addr
,
279 &tmp32
, sizeof(tmp32
), 1);
280 if (copied
== sizeof(tmp32
))
284 copied
= access_process_vm(child
, addr
,
285 &tmp64
, sizeof(tmp64
), 1);
286 if (copied
== sizeof(tmp64
))
290 pt_error_return(regs
, -res
);
292 pt_succ_return(regs
, res
);
296 case PTRACE_GETREGS
: {
297 struct pt_regs32 __user
*pregs
=
298 (struct pt_regs32 __user
*) addr
;
299 struct pt_regs
*cregs
= task_pt_regs(child
);
302 if (__put_user(tstate_to_psr(cregs
->tstate
), (&pregs
->psr
)) ||
303 __put_user(cregs
->tpc
, (&pregs
->pc
)) ||
304 __put_user(cregs
->tnpc
, (&pregs
->npc
)) ||
305 __put_user(cregs
->y
, (&pregs
->y
))) {
306 pt_error_return(regs
, EFAULT
);
309 for (rval
= 1; rval
< 16; rval
++)
310 if (__put_user(cregs
->u_regs
[rval
], (&pregs
->u_regs
[rval
- 1]))) {
311 pt_error_return(regs
, EFAULT
);
314 pt_succ_return(regs
, 0);
316 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs
->tpc
, cregs
->tnpc
, cregs
->u_regs
[15]);
321 case PTRACE_GETREGS64
: {
322 struct pt_regs __user
*pregs
= (struct pt_regs __user
*) addr
;
323 struct pt_regs
*cregs
= task_pt_regs(child
);
324 unsigned long tpc
= cregs
->tpc
;
327 if ((task_thread_info(child
)->flags
& _TIF_32BIT
) != 0)
329 if (__put_user(cregs
->tstate
, (&pregs
->tstate
)) ||
330 __put_user(tpc
, (&pregs
->tpc
)) ||
331 __put_user(cregs
->tnpc
, (&pregs
->tnpc
)) ||
332 __put_user(cregs
->y
, (&pregs
->y
))) {
333 pt_error_return(regs
, EFAULT
);
336 for (rval
= 1; rval
< 16; rval
++)
337 if (__put_user(cregs
->u_regs
[rval
], (&pregs
->u_regs
[rval
- 1]))) {
338 pt_error_return(regs
, EFAULT
);
341 pt_succ_return(regs
, 0);
343 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs
->tpc
, cregs
->tnpc
, cregs
->u_regs
[15]);
348 case PTRACE_SETREGS
: {
349 struct pt_regs32 __user
*pregs
=
350 (struct pt_regs32 __user
*) addr
;
351 struct pt_regs
*cregs
= task_pt_regs(child
);
352 unsigned int psr
, pc
, npc
, y
;
355 /* Must be careful, tracing process can only set certain
358 if (__get_user(psr
, (&pregs
->psr
)) ||
359 __get_user(pc
, (&pregs
->pc
)) ||
360 __get_user(npc
, (&pregs
->npc
)) ||
361 __get_user(y
, (&pregs
->y
))) {
362 pt_error_return(regs
, EFAULT
);
365 cregs
->tstate
&= ~(TSTATE_ICC
);
366 cregs
->tstate
|= psr_to_tstate_icc(psr
);
367 if (!((pc
| npc
) & 3)) {
372 for (i
= 1; i
< 16; i
++) {
373 if (__get_user(cregs
->u_regs
[i
], (&pregs
->u_regs
[i
-1]))) {
374 pt_error_return(regs
, EFAULT
);
378 pt_succ_return(regs
, 0);
382 case PTRACE_SETREGS64
: {
383 struct pt_regs __user
*pregs
= (struct pt_regs __user
*) addr
;
384 struct pt_regs
*cregs
= task_pt_regs(child
);
385 unsigned long tstate
, tpc
, tnpc
, y
;
388 /* Must be careful, tracing process can only set certain
391 if (__get_user(tstate
, (&pregs
->tstate
)) ||
392 __get_user(tpc
, (&pregs
->tpc
)) ||
393 __get_user(tnpc
, (&pregs
->tnpc
)) ||
394 __get_user(y
, (&pregs
->y
))) {
395 pt_error_return(regs
, EFAULT
);
398 if ((task_thread_info(child
)->flags
& _TIF_32BIT
) != 0) {
402 tstate
&= (TSTATE_ICC
| TSTATE_XCC
);
403 cregs
->tstate
&= ~(TSTATE_ICC
| TSTATE_XCC
);
404 cregs
->tstate
|= tstate
;
405 if (!((tpc
| tnpc
) & 3)) {
410 for (i
= 1; i
< 16; i
++) {
411 if (__get_user(cregs
->u_regs
[i
], (&pregs
->u_regs
[i
-1]))) {
412 pt_error_return(regs
, EFAULT
);
416 pt_succ_return(regs
, 0);
420 case PTRACE_GETFPREGS
: {
422 unsigned int regs
[32];
428 unsigned int insnaddr
;
432 struct fps __user
*fps
= (struct fps __user
*) addr
;
433 unsigned long *fpregs
= task_thread_info(child
)->fpregs
;
435 if (copy_to_user(&fps
->regs
[0], fpregs
,
436 (32 * sizeof(unsigned int))) ||
437 __put_user(task_thread_info(child
)->xfsr
[0], (&fps
->fsr
)) ||
438 __put_user(0, (&fps
->fpqd
)) ||
439 __put_user(0, (&fps
->flags
)) ||
440 __put_user(0, (&fps
->extra
)) ||
441 clear_user(&fps
->fpq
[0], 32 * sizeof(unsigned int))) {
442 pt_error_return(regs
, EFAULT
);
445 pt_succ_return(regs
, 0);
449 case PTRACE_GETFPREGS64
: {
451 unsigned int regs
[64];
454 struct fps __user
*fps
= (struct fps __user
*) addr
;
455 unsigned long *fpregs
= task_thread_info(child
)->fpregs
;
457 if (copy_to_user(&fps
->regs
[0], fpregs
,
458 (64 * sizeof(unsigned int))) ||
459 __put_user(task_thread_info(child
)->xfsr
[0], (&fps
->fsr
))) {
460 pt_error_return(regs
, EFAULT
);
463 pt_succ_return(regs
, 0);
467 case PTRACE_SETFPREGS
: {
469 unsigned int regs
[32];
475 unsigned int insnaddr
;
479 struct fps __user
*fps
= (struct fps __user
*) addr
;
480 unsigned long *fpregs
= task_thread_info(child
)->fpregs
;
483 if (copy_from_user(fpregs
, &fps
->regs
[0],
484 (32 * sizeof(unsigned int))) ||
485 __get_user(fsr
, (&fps
->fsr
))) {
486 pt_error_return(regs
, EFAULT
);
489 task_thread_info(child
)->xfsr
[0] &= 0xffffffff00000000UL
;
490 task_thread_info(child
)->xfsr
[0] |= fsr
;
491 if (!(task_thread_info(child
)->fpsaved
[0] & FPRS_FEF
))
492 task_thread_info(child
)->gsr
[0] = 0;
493 task_thread_info(child
)->fpsaved
[0] |= (FPRS_FEF
| FPRS_DL
);
494 pt_succ_return(regs
, 0);
498 case PTRACE_SETFPREGS64
: {
500 unsigned int regs
[64];
503 struct fps __user
*fps
= (struct fps __user
*) addr
;
504 unsigned long *fpregs
= task_thread_info(child
)->fpregs
;
506 if (copy_from_user(fpregs
, &fps
->regs
[0],
507 (64 * sizeof(unsigned int))) ||
508 __get_user(task_thread_info(child
)->xfsr
[0], (&fps
->fsr
))) {
509 pt_error_return(regs
, EFAULT
);
512 if (!(task_thread_info(child
)->fpsaved
[0] & FPRS_FEF
))
513 task_thread_info(child
)->gsr
[0] = 0;
514 task_thread_info(child
)->fpsaved
[0] |= (FPRS_FEF
| FPRS_DL
| FPRS_DU
);
515 pt_succ_return(regs
, 0);
519 case PTRACE_READTEXT
:
520 case PTRACE_READDATA
: {
521 int res
= ptrace_readdata(child
, addr
,
522 (char __user
*)addr2
, data
);
524 pt_succ_return(regs
, 0);
529 pt_error_return(regs
, -res
);
533 case PTRACE_WRITETEXT
:
534 case PTRACE_WRITEDATA
: {
535 int res
= ptrace_writedata(child
, (char __user
*) addr2
,
538 pt_succ_return(regs
, 0);
543 pt_error_return(regs
, -res
);
546 case PTRACE_SYSCALL
: /* continue and stop at (return from) syscall */
549 case PTRACE_CONT
: { /* restart after signal. */
550 if (!valid_signal(data
)) {
551 pt_error_return(regs
, EIO
);
555 if (request
== PTRACE_SYSCALL
) {
556 set_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
558 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
561 child
->exit_code
= data
;
563 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child
->comm
,
564 child
->pid
, child
->exit_code
,
565 task_pt_regs(child
)->tpc
,
566 task_pt_regs(child
)->tnpc
);
569 wake_up_process(child
);
570 pt_succ_return(regs
, 0);
575 * make the child exit. Best I can do is send it a sigkill.
576 * perhaps it should be put in the status that it wants to
580 if (child
->exit_state
== EXIT_ZOMBIE
) { /* already dead */
581 pt_succ_return(regs
, 0);
584 child
->exit_code
= SIGKILL
;
585 wake_up_process(child
);
586 pt_succ_return(regs
, 0);
590 case PTRACE_SUNDETACH
: { /* detach a process that was attached. */
591 int error
= ptrace_detach(child
, data
);
593 pt_error_return(regs
, EIO
);
596 pt_succ_return(regs
, 0);
600 /* PTRACE_DUMPCORE unsupported... */
603 int err
= ptrace_request(child
, request
, addr
, data
);
605 pt_error_return(regs
, -err
);
607 pt_succ_return(regs
, 0);
613 put_task_struct(child
);
618 asmlinkage
void syscall_trace(struct pt_regs
*regs
, int syscall_exit_p
)
620 /* do the secure computing check first */
621 secure_computing(regs
->u_regs
[UREG_G1
]);
623 if (unlikely(current
->audit_context
) && syscall_exit_p
) {
624 unsigned long tstate
= regs
->tstate
;
625 int result
= AUDITSC_SUCCESS
;
627 if (unlikely(tstate
& (TSTATE_XCARRY
| TSTATE_ICARRY
)))
628 result
= AUDITSC_FAILURE
;
630 audit_syscall_exit(current
, result
, regs
->u_regs
[UREG_I0
]);
633 if (!(current
->ptrace
& PT_PTRACED
))
636 if (!test_thread_flag(TIF_SYSCALL_TRACE
))
639 ptrace_notify(SIGTRAP
| ((current
->ptrace
& PT_TRACESYSGOOD
)
643 * this isn't the same as continuing with a signal, but it will do
644 * for normal use. strace only continues with a signal if the
645 * stopping signal is not SIGTRAP. -brl
647 if (current
->exit_code
) {
648 send_sig(current
->exit_code
, current
, 1);
649 current
->exit_code
= 0;
653 if (unlikely(current
->audit_context
) && !syscall_exit_p
)
654 audit_syscall_entry(current
,
655 (test_thread_flag(TIF_32BIT
) ?
658 regs
->u_regs
[UREG_G1
],
659 regs
->u_regs
[UREG_I0
],
660 regs
->u_regs
[UREG_I1
],
661 regs
->u_regs
[UREG_I2
],
662 regs
->u_regs
[UREG_I3
]);