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 if (tlb_type
== hypervisor
)
130 #ifdef DCACHE_ALIASING_POSSIBLE
131 /* If bit 13 of the kernel address we used to access the
132 * user page is the same as the virtual address that page
133 * is mapped to in the user's address space, we can skip the
136 if ((uaddr
^ (unsigned long) kaddr
) & (1UL << 13)) {
137 unsigned long start
= __pa(kaddr
);
138 unsigned long end
= start
+ len
;
139 unsigned long dcache_line_size
;
141 dcache_line_size
= local_cpu_data().dcache_line_size
;
143 if (tlb_type
== spitfire
) {
144 for (; start
< end
; start
+= dcache_line_size
)
145 spitfire_put_dcache_tag(start
& 0x3fe0, 0x0);
147 start
&= ~(dcache_line_size
- 1);
148 for (; start
< end
; start
+= dcache_line_size
)
149 __asm__
__volatile__(
150 "stxa %%g0, [%0] %1\n\t"
154 "i" (ASI_DCACHE_INVALIDATE
));
158 if (write
&& tlb_type
== spitfire
) {
159 unsigned long start
= (unsigned long) kaddr
;
160 unsigned long end
= start
+ len
;
161 unsigned long icache_line_size
;
163 icache_line_size
= local_cpu_data().icache_line_size
;
165 for (; start
< end
; start
+= icache_line_size
)
170 asmlinkage
void do_ptrace(struct pt_regs
*regs
)
172 int request
= regs
->u_regs
[UREG_I0
];
173 pid_t pid
= regs
->u_regs
[UREG_I1
];
174 unsigned long addr
= regs
->u_regs
[UREG_I2
];
175 unsigned long data
= regs
->u_regs
[UREG_I3
];
176 unsigned long addr2
= regs
->u_regs
[UREG_I4
];
177 struct task_struct
*child
;
180 if (test_thread_flag(TIF_32BIT
)) {
181 addr
&= 0xffffffffUL
;
182 data
&= 0xffffffffUL
;
183 addr2
&= 0xffffffffUL
;
190 if ((request
>= 0) && (request
<= 24))
195 if (request
== PTRACE_POKEDATA
&& data
== 0x91d02001){
196 printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n",
199 printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n",
200 s
, request
, pid
, addr
, data
, addr2
);
203 if (request
== PTRACE_TRACEME
) {
204 ret
= ptrace_traceme();
205 pt_succ_return(regs
, 0);
209 child
= ptrace_get_task_struct(pid
);
211 ret
= PTR_ERR(child
);
212 pt_error_return(regs
, -ret
);
216 if ((current
->personality
== PER_SUNOS
&& request
== PTRACE_SUNATTACH
)
217 || (current
->personality
!= PER_SUNOS
&& request
== PTRACE_ATTACH
)) {
218 if (ptrace_attach(child
)) {
219 pt_error_return(regs
, EPERM
);
222 pt_succ_return(regs
, 0);
226 ret
= ptrace_check_attach(child
, request
== PTRACE_KILL
);
228 pt_error_return(regs
, -ret
);
232 if (!(test_thread_flag(TIF_32BIT
)) &&
233 ((request
== PTRACE_READDATA64
) ||
234 (request
== PTRACE_WRITEDATA64
) ||
235 (request
== PTRACE_READTEXT64
) ||
236 (request
== PTRACE_WRITETEXT64
) ||
237 (request
== PTRACE_PEEKTEXT64
) ||
238 (request
== PTRACE_POKETEXT64
) ||
239 (request
== PTRACE_PEEKDATA64
) ||
240 (request
== PTRACE_POKEDATA64
))) {
241 addr
= regs
->u_regs
[UREG_G2
];
242 addr2
= regs
->u_regs
[UREG_G3
];
243 request
-= 30; /* wheee... */
249 pt_error_return(regs
, EIO
);
251 pt_succ_return(regs
, 0);
254 case PTRACE_PEEKTEXT
: /* read word at location addr. */
255 case PTRACE_PEEKDATA
: {
261 if (test_thread_flag(TIF_32BIT
)) {
262 copied
= access_process_vm(child
, addr
,
263 &tmp32
, sizeof(tmp32
), 0);
264 tmp64
= (unsigned long) tmp32
;
265 if (copied
== sizeof(tmp32
))
268 copied
= access_process_vm(child
, addr
,
269 &tmp64
, sizeof(tmp64
), 0);
270 if (copied
== sizeof(tmp64
))
274 pt_error_return(regs
, -res
);
276 pt_os_succ_return(regs
, tmp64
, (void __user
*) data
);
280 case PTRACE_POKETEXT
: /* write the word at location addr. */
281 case PTRACE_POKEDATA
: {
284 int copied
, res
= -EIO
;
286 if (test_thread_flag(TIF_32BIT
)) {
288 copied
= access_process_vm(child
, addr
,
289 &tmp32
, sizeof(tmp32
), 1);
290 if (copied
== sizeof(tmp32
))
294 copied
= access_process_vm(child
, addr
,
295 &tmp64
, sizeof(tmp64
), 1);
296 if (copied
== sizeof(tmp64
))
300 pt_error_return(regs
, -res
);
302 pt_succ_return(regs
, res
);
306 case PTRACE_GETREGS
: {
307 struct pt_regs32 __user
*pregs
=
308 (struct pt_regs32 __user
*) addr
;
309 struct pt_regs
*cregs
= task_pt_regs(child
);
312 if (__put_user(tstate_to_psr(cregs
->tstate
), (&pregs
->psr
)) ||
313 __put_user(cregs
->tpc
, (&pregs
->pc
)) ||
314 __put_user(cregs
->tnpc
, (&pregs
->npc
)) ||
315 __put_user(cregs
->y
, (&pregs
->y
))) {
316 pt_error_return(regs
, EFAULT
);
319 for (rval
= 1; rval
< 16; rval
++)
320 if (__put_user(cregs
->u_regs
[rval
], (&pregs
->u_regs
[rval
- 1]))) {
321 pt_error_return(regs
, EFAULT
);
324 pt_succ_return(regs
, 0);
326 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs
->tpc
, cregs
->tnpc
, cregs
->u_regs
[15]);
331 case PTRACE_GETREGS64
: {
332 struct pt_regs __user
*pregs
= (struct pt_regs __user
*) addr
;
333 struct pt_regs
*cregs
= task_pt_regs(child
);
334 unsigned long tpc
= cregs
->tpc
;
337 if ((task_thread_info(child
)->flags
& _TIF_32BIT
) != 0)
339 if (__put_user(cregs
->tstate
, (&pregs
->tstate
)) ||
340 __put_user(tpc
, (&pregs
->tpc
)) ||
341 __put_user(cregs
->tnpc
, (&pregs
->tnpc
)) ||
342 __put_user(cregs
->y
, (&pregs
->y
))) {
343 pt_error_return(regs
, EFAULT
);
346 for (rval
= 1; rval
< 16; rval
++)
347 if (__put_user(cregs
->u_regs
[rval
], (&pregs
->u_regs
[rval
- 1]))) {
348 pt_error_return(regs
, EFAULT
);
351 pt_succ_return(regs
, 0);
353 printk ("PC=%lx nPC=%lx o7=%lx\n", cregs
->tpc
, cregs
->tnpc
, cregs
->u_regs
[15]);
358 case PTRACE_SETREGS
: {
359 struct pt_regs32 __user
*pregs
=
360 (struct pt_regs32 __user
*) addr
;
361 struct pt_regs
*cregs
= task_pt_regs(child
);
362 unsigned int psr
, pc
, npc
, y
;
365 /* Must be careful, tracing process can only set certain
368 if (__get_user(psr
, (&pregs
->psr
)) ||
369 __get_user(pc
, (&pregs
->pc
)) ||
370 __get_user(npc
, (&pregs
->npc
)) ||
371 __get_user(y
, (&pregs
->y
))) {
372 pt_error_return(regs
, EFAULT
);
375 cregs
->tstate
&= ~(TSTATE_ICC
);
376 cregs
->tstate
|= psr_to_tstate_icc(psr
);
377 if (!((pc
| npc
) & 3)) {
382 for (i
= 1; i
< 16; i
++) {
383 if (__get_user(cregs
->u_regs
[i
], (&pregs
->u_regs
[i
-1]))) {
384 pt_error_return(regs
, EFAULT
);
388 pt_succ_return(regs
, 0);
392 case PTRACE_SETREGS64
: {
393 struct pt_regs __user
*pregs
= (struct pt_regs __user
*) addr
;
394 struct pt_regs
*cregs
= task_pt_regs(child
);
395 unsigned long tstate
, tpc
, tnpc
, y
;
398 /* Must be careful, tracing process can only set certain
401 if (__get_user(tstate
, (&pregs
->tstate
)) ||
402 __get_user(tpc
, (&pregs
->tpc
)) ||
403 __get_user(tnpc
, (&pregs
->tnpc
)) ||
404 __get_user(y
, (&pregs
->y
))) {
405 pt_error_return(regs
, EFAULT
);
408 if ((task_thread_info(child
)->flags
& _TIF_32BIT
) != 0) {
412 tstate
&= (TSTATE_ICC
| TSTATE_XCC
);
413 cregs
->tstate
&= ~(TSTATE_ICC
| TSTATE_XCC
);
414 cregs
->tstate
|= tstate
;
415 if (!((tpc
| tnpc
) & 3)) {
420 for (i
= 1; i
< 16; i
++) {
421 if (__get_user(cregs
->u_regs
[i
], (&pregs
->u_regs
[i
-1]))) {
422 pt_error_return(regs
, EFAULT
);
426 pt_succ_return(regs
, 0);
430 case PTRACE_GETFPREGS
: {
432 unsigned int regs
[32];
438 unsigned int insnaddr
;
442 struct fps __user
*fps
= (struct fps __user
*) addr
;
443 unsigned long *fpregs
= task_thread_info(child
)->fpregs
;
445 if (copy_to_user(&fps
->regs
[0], fpregs
,
446 (32 * sizeof(unsigned int))) ||
447 __put_user(task_thread_info(child
)->xfsr
[0], (&fps
->fsr
)) ||
448 __put_user(0, (&fps
->fpqd
)) ||
449 __put_user(0, (&fps
->flags
)) ||
450 __put_user(0, (&fps
->extra
)) ||
451 clear_user(&fps
->fpq
[0], 32 * sizeof(unsigned int))) {
452 pt_error_return(regs
, EFAULT
);
455 pt_succ_return(regs
, 0);
459 case PTRACE_GETFPREGS64
: {
461 unsigned int regs
[64];
464 struct fps __user
*fps
= (struct fps __user
*) addr
;
465 unsigned long *fpregs
= task_thread_info(child
)->fpregs
;
467 if (copy_to_user(&fps
->regs
[0], fpregs
,
468 (64 * sizeof(unsigned int))) ||
469 __put_user(task_thread_info(child
)->xfsr
[0], (&fps
->fsr
))) {
470 pt_error_return(regs
, EFAULT
);
473 pt_succ_return(regs
, 0);
477 case PTRACE_SETFPREGS
: {
479 unsigned int regs
[32];
485 unsigned int insnaddr
;
489 struct fps __user
*fps
= (struct fps __user
*) addr
;
490 unsigned long *fpregs
= task_thread_info(child
)->fpregs
;
493 if (copy_from_user(fpregs
, &fps
->regs
[0],
494 (32 * sizeof(unsigned int))) ||
495 __get_user(fsr
, (&fps
->fsr
))) {
496 pt_error_return(regs
, EFAULT
);
499 task_thread_info(child
)->xfsr
[0] &= 0xffffffff00000000UL
;
500 task_thread_info(child
)->xfsr
[0] |= fsr
;
501 if (!(task_thread_info(child
)->fpsaved
[0] & FPRS_FEF
))
502 task_thread_info(child
)->gsr
[0] = 0;
503 task_thread_info(child
)->fpsaved
[0] |= (FPRS_FEF
| FPRS_DL
);
504 pt_succ_return(regs
, 0);
508 case PTRACE_SETFPREGS64
: {
510 unsigned int regs
[64];
513 struct fps __user
*fps
= (struct fps __user
*) addr
;
514 unsigned long *fpregs
= task_thread_info(child
)->fpregs
;
516 if (copy_from_user(fpregs
, &fps
->regs
[0],
517 (64 * sizeof(unsigned int))) ||
518 __get_user(task_thread_info(child
)->xfsr
[0], (&fps
->fsr
))) {
519 pt_error_return(regs
, EFAULT
);
522 if (!(task_thread_info(child
)->fpsaved
[0] & FPRS_FEF
))
523 task_thread_info(child
)->gsr
[0] = 0;
524 task_thread_info(child
)->fpsaved
[0] |= (FPRS_FEF
| FPRS_DL
| FPRS_DU
);
525 pt_succ_return(regs
, 0);
529 case PTRACE_READTEXT
:
530 case PTRACE_READDATA
: {
531 int res
= ptrace_readdata(child
, addr
,
532 (char __user
*)addr2
, data
);
534 pt_succ_return(regs
, 0);
539 pt_error_return(regs
, -res
);
543 case PTRACE_WRITETEXT
:
544 case PTRACE_WRITEDATA
: {
545 int res
= ptrace_writedata(child
, (char __user
*) addr2
,
548 pt_succ_return(regs
, 0);
553 pt_error_return(regs
, -res
);
556 case PTRACE_SYSCALL
: /* continue and stop at (return from) syscall */
559 case PTRACE_CONT
: { /* restart after signal. */
560 if (!valid_signal(data
)) {
561 pt_error_return(regs
, EIO
);
565 if (request
== PTRACE_SYSCALL
) {
566 set_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
568 clear_tsk_thread_flag(child
, TIF_SYSCALL_TRACE
);
571 child
->exit_code
= data
;
573 printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child
->comm
,
574 child
->pid
, child
->exit_code
,
575 task_pt_regs(child
)->tpc
,
576 task_pt_regs(child
)->tnpc
);
579 wake_up_process(child
);
580 pt_succ_return(regs
, 0);
585 * make the child exit. Best I can do is send it a sigkill.
586 * perhaps it should be put in the status that it wants to
590 if (child
->exit_state
== EXIT_ZOMBIE
) { /* already dead */
591 pt_succ_return(regs
, 0);
594 child
->exit_code
= SIGKILL
;
595 wake_up_process(child
);
596 pt_succ_return(regs
, 0);
600 case PTRACE_SUNDETACH
: { /* detach a process that was attached. */
601 int error
= ptrace_detach(child
, data
);
603 pt_error_return(regs
, EIO
);
606 pt_succ_return(regs
, 0);
610 /* PTRACE_DUMPCORE unsupported... */
612 case PTRACE_GETEVENTMSG
: {
615 if (test_thread_flag(TIF_32BIT
))
616 err
= put_user(child
->ptrace_message
,
617 (unsigned int __user
*) data
);
619 err
= put_user(child
->ptrace_message
,
620 (unsigned long __user
*) data
);
622 pt_error_return(regs
, -err
);
624 pt_succ_return(regs
, 0);
629 int err
= ptrace_request(child
, request
, addr
, data
);
631 pt_error_return(regs
, -err
);
633 pt_succ_return(regs
, 0);
639 put_task_struct(child
);
644 asmlinkage
void syscall_trace(struct pt_regs
*regs
, int syscall_exit_p
)
646 /* do the secure computing check first */
647 secure_computing(regs
->u_regs
[UREG_G1
]);
649 if (unlikely(current
->audit_context
) && syscall_exit_p
) {
650 unsigned long tstate
= regs
->tstate
;
651 int result
= AUDITSC_SUCCESS
;
653 if (unlikely(tstate
& (TSTATE_XCARRY
| TSTATE_ICARRY
)))
654 result
= AUDITSC_FAILURE
;
656 audit_syscall_exit(result
, regs
->u_regs
[UREG_I0
]);
659 if (!(current
->ptrace
& PT_PTRACED
))
662 if (!test_thread_flag(TIF_SYSCALL_TRACE
))
665 ptrace_notify(SIGTRAP
| ((current
->ptrace
& PT_TRACESYSGOOD
)
669 * this isn't the same as continuing with a signal, but it will do
670 * for normal use. strace only continues with a signal if the
671 * stopping signal is not SIGTRAP. -brl
673 if (current
->exit_code
) {
674 send_sig(current
->exit_code
, current
, 1);
675 current
->exit_code
= 0;
679 if (unlikely(current
->audit_context
) && !syscall_exit_p
)
680 audit_syscall_entry((test_thread_flag(TIF_32BIT
) ?
683 regs
->u_regs
[UREG_G1
],
684 regs
->u_regs
[UREG_I0
],
685 regs
->u_regs
[UREG_I1
],
686 regs
->u_regs
[UREG_I2
],
687 regs
->u_regs
[UREG_I3
]);