Commit | Line | Data |
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1da177e4 LT |
1 | /* ptrace.c: Sparc process tracing support. |
2 | * | |
3 | * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu) | |
4 | * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
5 | * | |
6 | * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson, | |
7 | * and David Mosberger. | |
8 | * | |
9 | * Added Linux support -miguel (weird, eh?, the original code was meant | |
10 | * to emulate SunOS). | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/mm.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> | |
f7ceba36 DM |
22 | #include <linux/seccomp.h> |
23 | #include <linux/audit.h> | |
7ed20e1a | 24 | #include <linux/signal.h> |
1da177e4 LT |
25 | |
26 | #include <asm/asi.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> | |
6a9b490d | 33 | #include <asm/page.h> |
1da177e4 LT |
34 | |
35 | /* Returning from ptrace is a bit tricky because the syscall return | |
36 | * low level code assumes any value returned which is negative and | |
37 | * is a valid errno will mean setting the condition codes to indicate | |
38 | * an error return. This doesn't work, so we have this hook. | |
39 | */ | |
40 | static inline void pt_error_return(struct pt_regs *regs, unsigned long error) | |
41 | { | |
42 | regs->u_regs[UREG_I0] = error; | |
43 | regs->tstate |= (TSTATE_ICARRY | TSTATE_XCARRY); | |
44 | regs->tpc = regs->tnpc; | |
45 | regs->tnpc += 4; | |
46 | } | |
47 | ||
48 | static inline void pt_succ_return(struct pt_regs *regs, unsigned long value) | |
49 | { | |
50 | regs->u_regs[UREG_I0] = value; | |
51 | regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY); | |
52 | regs->tpc = regs->tnpc; | |
53 | regs->tnpc += 4; | |
54 | } | |
55 | ||
56 | static inline void | |
57 | pt_succ_return_linux(struct pt_regs *regs, unsigned long value, void __user *addr) | |
58 | { | |
59 | if (test_thread_flag(TIF_32BIT)) { | |
60 | if (put_user(value, (unsigned int __user *) addr)) { | |
61 | pt_error_return(regs, EFAULT); | |
62 | return; | |
63 | } | |
64 | } else { | |
65 | if (put_user(value, (long __user *) addr)) { | |
66 | pt_error_return(regs, EFAULT); | |
67 | return; | |
68 | } | |
69 | } | |
70 | regs->u_regs[UREG_I0] = 0; | |
71 | regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY); | |
72 | regs->tpc = regs->tnpc; | |
73 | regs->tnpc += 4; | |
74 | } | |
75 | ||
76 | static void | |
77 | pt_os_succ_return (struct pt_regs *regs, unsigned long val, void __user *addr) | |
78 | { | |
79 | if (current->personality == PER_SUNOS) | |
80 | pt_succ_return (regs, val); | |
81 | else | |
82 | pt_succ_return_linux (regs, val, addr); | |
83 | } | |
84 | ||
85 | /* #define ALLOW_INIT_TRACING */ | |
86 | /* #define DEBUG_PTRACE */ | |
87 | ||
88 | #ifdef DEBUG_PTRACE | |
89 | char *pt_rq [] = { | |
90 | /* 0 */ "TRACEME", "PEEKTEXT", "PEEKDATA", "PEEKUSR", | |
91 | /* 4 */ "POKETEXT", "POKEDATA", "POKEUSR", "CONT", | |
92 | /* 8 */ "KILL", "SINGLESTEP", "SUNATTACH", "SUNDETACH", | |
93 | /* 12 */ "GETREGS", "SETREGS", "GETFPREGS", "SETFPREGS", | |
94 | /* 16 */ "READDATA", "WRITEDATA", "READTEXT", "WRITETEXT", | |
95 | /* 20 */ "GETFPAREGS", "SETFPAREGS", "unknown", "unknown", | |
96 | /* 24 */ "SYSCALL", "" | |
97 | }; | |
98 | #endif | |
99 | ||
100 | /* | |
101 | * Called by kernel/ptrace.c when detaching.. | |
102 | * | |
103 | * Make sure single step bits etc are not set. | |
104 | */ | |
105 | void ptrace_disable(struct task_struct *child) | |
106 | { | |
107 | /* nothing to do */ | |
108 | } | |
109 | ||
dadeafdf DM |
110 | /* To get the necessary page struct, access_process_vm() first calls |
111 | * get_user_pages(). This has done a flush_dcache_page() on the | |
112 | * accessed page. Then our caller (copy_{to,from}_user_page()) did | |
113 | * to memcpy to read/write the data from that page. | |
114 | * | |
115 | * Now, the only thing we have to do is: | |
116 | * 1) flush the D-cache if it's possible than an illegal alias | |
117 | * has been created | |
118 | * 2) flush the I-cache if this is pre-cheetah and we did a write | |
119 | */ | |
120 | void flush_ptrace_access(struct vm_area_struct *vma, struct page *page, | |
121 | unsigned long uaddr, void *kaddr, | |
122 | unsigned long len, int write) | |
123 | { | |
124 | BUG_ON(len > PAGE_SIZE); | |
125 | ||
126 | #ifdef DCACHE_ALIASING_POSSIBLE | |
127 | /* If bit 13 of the kernel address we used to access the | |
128 | * user page is the same as the virtual address that page | |
129 | * is mapped to in the user's address space, we can skip the | |
130 | * D-cache flush. | |
131 | */ | |
6a9b490d | 132 | if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) { |
dadeafdf DM |
133 | unsigned long start = __pa(kaddr); |
134 | unsigned long end = start + len; | |
135 | ||
136 | if (tlb_type == spitfire) { | |
137 | for (; start < end; start += 32) | |
6a9b490d | 138 | spitfire_put_dcache_tag(start & 0x3fe0, 0x0); |
dadeafdf DM |
139 | } else { |
140 | for (; start < end; start += 32) | |
141 | __asm__ __volatile__( | |
142 | "stxa %%g0, [%0] %1\n\t" | |
143 | "membar #Sync" | |
144 | : /* no outputs */ | |
6a9b490d | 145 | : "r" (start), |
dadeafdf DM |
146 | "i" (ASI_DCACHE_INVALIDATE)); |
147 | } | |
148 | } | |
149 | #endif | |
150 | if (write && tlb_type == spitfire) { | |
151 | unsigned long start = (unsigned long) kaddr; | |
152 | unsigned long end = start + len; | |
153 | ||
154 | for (; start < end; start += 32) | |
155 | flushi(start); | |
156 | } | |
157 | } | |
158 | ||
1da177e4 LT |
159 | asmlinkage void do_ptrace(struct pt_regs *regs) |
160 | { | |
161 | int request = regs->u_regs[UREG_I0]; | |
162 | pid_t pid = regs->u_regs[UREG_I1]; | |
163 | unsigned long addr = regs->u_regs[UREG_I2]; | |
164 | unsigned long data = regs->u_regs[UREG_I3]; | |
165 | unsigned long addr2 = regs->u_regs[UREG_I4]; | |
166 | struct task_struct *child; | |
167 | int ret; | |
168 | ||
169 | if (test_thread_flag(TIF_32BIT)) { | |
170 | addr &= 0xffffffffUL; | |
171 | data &= 0xffffffffUL; | |
172 | addr2 &= 0xffffffffUL; | |
173 | } | |
174 | lock_kernel(); | |
175 | #ifdef DEBUG_PTRACE | |
176 | { | |
177 | char *s; | |
178 | ||
179 | if ((request >= 0) && (request <= 24)) | |
180 | s = pt_rq [request]; | |
181 | else | |
182 | s = "unknown"; | |
183 | ||
184 | if (request == PTRACE_POKEDATA && data == 0x91d02001){ | |
185 | printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n", | |
186 | pid, addr, addr2); | |
187 | } else | |
188 | printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n", | |
189 | s, request, pid, addr, data, addr2); | |
190 | } | |
191 | #endif | |
192 | if (request == PTRACE_TRACEME) { | |
193 | int ret; | |
194 | ||
195 | /* are we already being traced? */ | |
196 | if (current->ptrace & PT_PTRACED) { | |
197 | pt_error_return(regs, EPERM); | |
198 | goto out; | |
199 | } | |
200 | ret = security_ptrace(current->parent, current); | |
201 | if (ret) { | |
202 | pt_error_return(regs, -ret); | |
203 | goto out; | |
204 | } | |
205 | ||
206 | /* set the ptrace bit in the process flags. */ | |
207 | current->ptrace |= PT_PTRACED; | |
208 | pt_succ_return(regs, 0); | |
209 | goto out; | |
210 | } | |
211 | #ifndef ALLOW_INIT_TRACING | |
212 | if (pid == 1) { | |
213 | /* Can't dork with init. */ | |
214 | pt_error_return(regs, EPERM); | |
215 | goto out; | |
216 | } | |
217 | #endif | |
218 | read_lock(&tasklist_lock); | |
219 | child = find_task_by_pid(pid); | |
220 | if (child) | |
221 | get_task_struct(child); | |
222 | read_unlock(&tasklist_lock); | |
223 | ||
224 | if (!child) { | |
225 | pt_error_return(regs, ESRCH); | |
226 | goto out; | |
227 | } | |
228 | ||
229 | if ((current->personality == PER_SUNOS && request == PTRACE_SUNATTACH) | |
230 | || (current->personality != PER_SUNOS && request == PTRACE_ATTACH)) { | |
231 | if (ptrace_attach(child)) { | |
232 | pt_error_return(regs, EPERM); | |
233 | goto out_tsk; | |
234 | } | |
235 | pt_succ_return(regs, 0); | |
236 | goto out_tsk; | |
237 | } | |
238 | ||
239 | ret = ptrace_check_attach(child, request == PTRACE_KILL); | |
240 | if (ret < 0) { | |
241 | pt_error_return(regs, -ret); | |
242 | goto out_tsk; | |
243 | } | |
244 | ||
245 | if (!(test_thread_flag(TIF_32BIT)) && | |
246 | ((request == PTRACE_READDATA64) || | |
247 | (request == PTRACE_WRITEDATA64) || | |
248 | (request == PTRACE_READTEXT64) || | |
249 | (request == PTRACE_WRITETEXT64) || | |
250 | (request == PTRACE_PEEKTEXT64) || | |
251 | (request == PTRACE_POKETEXT64) || | |
252 | (request == PTRACE_PEEKDATA64) || | |
253 | (request == PTRACE_POKEDATA64))) { | |
254 | addr = regs->u_regs[UREG_G2]; | |
255 | addr2 = regs->u_regs[UREG_G3]; | |
256 | request -= 30; /* wheee... */ | |
257 | } | |
258 | ||
259 | switch(request) { | |
260 | case PTRACE_PEEKTEXT: /* read word at location addr. */ | |
261 | case PTRACE_PEEKDATA: { | |
262 | unsigned long tmp64; | |
263 | unsigned int tmp32; | |
264 | int res, copied; | |
265 | ||
266 | res = -EIO; | |
267 | if (test_thread_flag(TIF_32BIT)) { | |
268 | copied = access_process_vm(child, addr, | |
269 | &tmp32, sizeof(tmp32), 0); | |
270 | tmp64 = (unsigned long) tmp32; | |
271 | if (copied == sizeof(tmp32)) | |
272 | res = 0; | |
273 | } else { | |
274 | copied = access_process_vm(child, addr, | |
275 | &tmp64, sizeof(tmp64), 0); | |
276 | if (copied == sizeof(tmp64)) | |
277 | res = 0; | |
278 | } | |
279 | if (res < 0) | |
280 | pt_error_return(regs, -res); | |
281 | else | |
282 | pt_os_succ_return(regs, tmp64, (void __user *) data); | |
dadeafdf | 283 | goto out_tsk; |
1da177e4 LT |
284 | } |
285 | ||
286 | case PTRACE_POKETEXT: /* write the word at location addr. */ | |
287 | case PTRACE_POKEDATA: { | |
288 | unsigned long tmp64; | |
289 | unsigned int tmp32; | |
290 | int copied, res = -EIO; | |
291 | ||
292 | if (test_thread_flag(TIF_32BIT)) { | |
293 | tmp32 = data; | |
294 | copied = access_process_vm(child, addr, | |
295 | &tmp32, sizeof(tmp32), 1); | |
296 | if (copied == sizeof(tmp32)) | |
297 | res = 0; | |
298 | } else { | |
299 | tmp64 = data; | |
300 | copied = access_process_vm(child, addr, | |
301 | &tmp64, sizeof(tmp64), 1); | |
302 | if (copied == sizeof(tmp64)) | |
303 | res = 0; | |
304 | } | |
305 | if (res < 0) | |
306 | pt_error_return(regs, -res); | |
307 | else | |
308 | pt_succ_return(regs, res); | |
dadeafdf | 309 | goto out_tsk; |
1da177e4 LT |
310 | } |
311 | ||
312 | case PTRACE_GETREGS: { | |
313 | struct pt_regs32 __user *pregs = | |
314 | (struct pt_regs32 __user *) addr; | |
315 | struct pt_regs *cregs = child->thread_info->kregs; | |
316 | int rval; | |
317 | ||
318 | if (__put_user(tstate_to_psr(cregs->tstate), (&pregs->psr)) || | |
319 | __put_user(cregs->tpc, (&pregs->pc)) || | |
320 | __put_user(cregs->tnpc, (&pregs->npc)) || | |
321 | __put_user(cregs->y, (&pregs->y))) { | |
322 | pt_error_return(regs, EFAULT); | |
323 | goto out_tsk; | |
324 | } | |
325 | for (rval = 1; rval < 16; rval++) | |
326 | if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) { | |
327 | pt_error_return(regs, EFAULT); | |
328 | goto out_tsk; | |
329 | } | |
330 | pt_succ_return(regs, 0); | |
331 | #ifdef DEBUG_PTRACE | |
332 | printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]); | |
333 | #endif | |
334 | goto out_tsk; | |
335 | } | |
336 | ||
337 | case PTRACE_GETREGS64: { | |
338 | struct pt_regs __user *pregs = (struct pt_regs __user *) addr; | |
339 | struct pt_regs *cregs = child->thread_info->kregs; | |
340 | unsigned long tpc = cregs->tpc; | |
341 | int rval; | |
342 | ||
343 | if ((child->thread_info->flags & _TIF_32BIT) != 0) | |
344 | tpc &= 0xffffffff; | |
345 | if (__put_user(cregs->tstate, (&pregs->tstate)) || | |
346 | __put_user(tpc, (&pregs->tpc)) || | |
347 | __put_user(cregs->tnpc, (&pregs->tnpc)) || | |
348 | __put_user(cregs->y, (&pregs->y))) { | |
349 | pt_error_return(regs, EFAULT); | |
350 | goto out_tsk; | |
351 | } | |
352 | for (rval = 1; rval < 16; rval++) | |
353 | if (__put_user(cregs->u_regs[rval], (&pregs->u_regs[rval - 1]))) { | |
354 | pt_error_return(regs, EFAULT); | |
355 | goto out_tsk; | |
356 | } | |
357 | pt_succ_return(regs, 0); | |
358 | #ifdef DEBUG_PTRACE | |
359 | printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]); | |
360 | #endif | |
361 | goto out_tsk; | |
362 | } | |
363 | ||
364 | case PTRACE_SETREGS: { | |
365 | struct pt_regs32 __user *pregs = | |
366 | (struct pt_regs32 __user *) addr; | |
367 | struct pt_regs *cregs = child->thread_info->kregs; | |
368 | unsigned int psr, pc, npc, y; | |
369 | int i; | |
370 | ||
371 | /* Must be careful, tracing process can only set certain | |
372 | * bits in the psr. | |
373 | */ | |
374 | if (__get_user(psr, (&pregs->psr)) || | |
375 | __get_user(pc, (&pregs->pc)) || | |
376 | __get_user(npc, (&pregs->npc)) || | |
377 | __get_user(y, (&pregs->y))) { | |
378 | pt_error_return(regs, EFAULT); | |
379 | goto out_tsk; | |
380 | } | |
381 | cregs->tstate &= ~(TSTATE_ICC); | |
382 | cregs->tstate |= psr_to_tstate_icc(psr); | |
383 | if (!((pc | npc) & 3)) { | |
384 | cregs->tpc = pc; | |
385 | cregs->tnpc = npc; | |
386 | } | |
387 | cregs->y = y; | |
388 | for (i = 1; i < 16; i++) { | |
389 | if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) { | |
390 | pt_error_return(regs, EFAULT); | |
391 | goto out_tsk; | |
392 | } | |
393 | } | |
394 | pt_succ_return(regs, 0); | |
395 | goto out_tsk; | |
396 | } | |
397 | ||
398 | case PTRACE_SETREGS64: { | |
399 | struct pt_regs __user *pregs = (struct pt_regs __user *) addr; | |
400 | struct pt_regs *cregs = child->thread_info->kregs; | |
401 | unsigned long tstate, tpc, tnpc, y; | |
402 | int i; | |
403 | ||
404 | /* Must be careful, tracing process can only set certain | |
405 | * bits in the psr. | |
406 | */ | |
407 | if (__get_user(tstate, (&pregs->tstate)) || | |
408 | __get_user(tpc, (&pregs->tpc)) || | |
409 | __get_user(tnpc, (&pregs->tnpc)) || | |
410 | __get_user(y, (&pregs->y))) { | |
411 | pt_error_return(regs, EFAULT); | |
412 | goto out_tsk; | |
413 | } | |
414 | if ((child->thread_info->flags & _TIF_32BIT) != 0) { | |
415 | tpc &= 0xffffffff; | |
416 | tnpc &= 0xffffffff; | |
417 | } | |
418 | tstate &= (TSTATE_ICC | TSTATE_XCC); | |
419 | cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC); | |
420 | cregs->tstate |= tstate; | |
421 | if (!((tpc | tnpc) & 3)) { | |
422 | cregs->tpc = tpc; | |
423 | cregs->tnpc = tnpc; | |
424 | } | |
425 | cregs->y = y; | |
426 | for (i = 1; i < 16; i++) { | |
427 | if (__get_user(cregs->u_regs[i], (&pregs->u_regs[i-1]))) { | |
428 | pt_error_return(regs, EFAULT); | |
429 | goto out_tsk; | |
430 | } | |
431 | } | |
432 | pt_succ_return(regs, 0); | |
433 | goto out_tsk; | |
434 | } | |
435 | ||
436 | case PTRACE_GETFPREGS: { | |
437 | struct fps { | |
438 | unsigned int regs[32]; | |
439 | unsigned int fsr; | |
440 | unsigned int flags; | |
441 | unsigned int extra; | |
442 | unsigned int fpqd; | |
443 | struct fq { | |
444 | unsigned int insnaddr; | |
445 | unsigned int insn; | |
446 | } fpq[16]; | |
447 | }; | |
448 | struct fps __user *fps = (struct fps __user *) addr; | |
449 | unsigned long *fpregs = child->thread_info->fpregs; | |
450 | ||
451 | if (copy_to_user(&fps->regs[0], fpregs, | |
452 | (32 * sizeof(unsigned int))) || | |
453 | __put_user(child->thread_info->xfsr[0], (&fps->fsr)) || | |
454 | __put_user(0, (&fps->fpqd)) || | |
455 | __put_user(0, (&fps->flags)) || | |
456 | __put_user(0, (&fps->extra)) || | |
457 | clear_user(&fps->fpq[0], 32 * sizeof(unsigned int))) { | |
458 | pt_error_return(regs, EFAULT); | |
459 | goto out_tsk; | |
460 | } | |
461 | pt_succ_return(regs, 0); | |
462 | goto out_tsk; | |
463 | } | |
464 | ||
465 | case PTRACE_GETFPREGS64: { | |
466 | struct fps { | |
467 | unsigned int regs[64]; | |
468 | unsigned long fsr; | |
469 | }; | |
470 | struct fps __user *fps = (struct fps __user *) addr; | |
471 | unsigned long *fpregs = child->thread_info->fpregs; | |
472 | ||
473 | if (copy_to_user(&fps->regs[0], fpregs, | |
474 | (64 * sizeof(unsigned int))) || | |
475 | __put_user(child->thread_info->xfsr[0], (&fps->fsr))) { | |
476 | pt_error_return(regs, EFAULT); | |
477 | goto out_tsk; | |
478 | } | |
479 | pt_succ_return(regs, 0); | |
480 | goto out_tsk; | |
481 | } | |
482 | ||
483 | case PTRACE_SETFPREGS: { | |
484 | struct fps { | |
485 | unsigned int regs[32]; | |
486 | unsigned int fsr; | |
487 | unsigned int flags; | |
488 | unsigned int extra; | |
489 | unsigned int fpqd; | |
490 | struct fq { | |
491 | unsigned int insnaddr; | |
492 | unsigned int insn; | |
493 | } fpq[16]; | |
494 | }; | |
495 | struct fps __user *fps = (struct fps __user *) addr; | |
496 | unsigned long *fpregs = child->thread_info->fpregs; | |
497 | unsigned fsr; | |
498 | ||
499 | if (copy_from_user(fpregs, &fps->regs[0], | |
500 | (32 * sizeof(unsigned int))) || | |
501 | __get_user(fsr, (&fps->fsr))) { | |
502 | pt_error_return(regs, EFAULT); | |
503 | goto out_tsk; | |
504 | } | |
505 | child->thread_info->xfsr[0] &= 0xffffffff00000000UL; | |
506 | child->thread_info->xfsr[0] |= fsr; | |
507 | if (!(child->thread_info->fpsaved[0] & FPRS_FEF)) | |
508 | child->thread_info->gsr[0] = 0; | |
509 | child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL); | |
510 | pt_succ_return(regs, 0); | |
511 | goto out_tsk; | |
512 | } | |
513 | ||
514 | case PTRACE_SETFPREGS64: { | |
515 | struct fps { | |
516 | unsigned int regs[64]; | |
517 | unsigned long fsr; | |
518 | }; | |
519 | struct fps __user *fps = (struct fps __user *) addr; | |
520 | unsigned long *fpregs = child->thread_info->fpregs; | |
521 | ||
522 | if (copy_from_user(fpregs, &fps->regs[0], | |
523 | (64 * sizeof(unsigned int))) || | |
524 | __get_user(child->thread_info->xfsr[0], (&fps->fsr))) { | |
525 | pt_error_return(regs, EFAULT); | |
526 | goto out_tsk; | |
527 | } | |
528 | if (!(child->thread_info->fpsaved[0] & FPRS_FEF)) | |
529 | child->thread_info->gsr[0] = 0; | |
530 | child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU); | |
531 | pt_succ_return(regs, 0); | |
532 | goto out_tsk; | |
533 | } | |
534 | ||
535 | case PTRACE_READTEXT: | |
536 | case PTRACE_READDATA: { | |
537 | int res = ptrace_readdata(child, addr, | |
538 | (char __user *)addr2, data); | |
539 | if (res == data) { | |
540 | pt_succ_return(regs, 0); | |
dadeafdf | 541 | goto out_tsk; |
1da177e4 LT |
542 | } |
543 | if (res >= 0) | |
544 | res = -EIO; | |
545 | pt_error_return(regs, -res); | |
dadeafdf | 546 | goto out_tsk; |
1da177e4 LT |
547 | } |
548 | ||
549 | case PTRACE_WRITETEXT: | |
550 | case PTRACE_WRITEDATA: { | |
551 | int res = ptrace_writedata(child, (char __user *) addr2, | |
552 | addr, data); | |
553 | if (res == data) { | |
554 | pt_succ_return(regs, 0); | |
dadeafdf | 555 | goto out_tsk; |
1da177e4 LT |
556 | } |
557 | if (res >= 0) | |
558 | res = -EIO; | |
559 | pt_error_return(regs, -res); | |
dadeafdf | 560 | goto out_tsk; |
1da177e4 LT |
561 | } |
562 | case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */ | |
563 | addr = 1; | |
564 | ||
565 | case PTRACE_CONT: { /* restart after signal. */ | |
7ed20e1a | 566 | if (!valid_signal(data)) { |
1da177e4 LT |
567 | pt_error_return(regs, EIO); |
568 | goto out_tsk; | |
569 | } | |
1da177e4 LT |
570 | |
571 | if (request == PTRACE_SYSCALL) { | |
572 | set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
573 | } else { | |
574 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
575 | } | |
576 | ||
577 | child->exit_code = data; | |
578 | #ifdef DEBUG_PTRACE | |
579 | printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm, | |
580 | child->pid, child->exit_code, | |
581 | child->thread_info->kregs->tpc, | |
582 | child->thread_info->kregs->tnpc); | |
583 | ||
584 | #endif | |
585 | wake_up_process(child); | |
586 | pt_succ_return(regs, 0); | |
587 | goto out_tsk; | |
588 | } | |
589 | ||
590 | /* | |
591 | * make the child exit. Best I can do is send it a sigkill. | |
592 | * perhaps it should be put in the status that it wants to | |
593 | * exit. | |
594 | */ | |
595 | case PTRACE_KILL: { | |
596 | if (child->exit_state == EXIT_ZOMBIE) { /* already dead */ | |
597 | pt_succ_return(regs, 0); | |
598 | goto out_tsk; | |
599 | } | |
600 | child->exit_code = SIGKILL; | |
601 | wake_up_process(child); | |
602 | pt_succ_return(regs, 0); | |
603 | goto out_tsk; | |
604 | } | |
605 | ||
606 | case PTRACE_SUNDETACH: { /* detach a process that was attached. */ | |
607 | int error = ptrace_detach(child, data); | |
608 | if (error) { | |
609 | pt_error_return(regs, EIO); | |
610 | goto out_tsk; | |
611 | } | |
612 | pt_succ_return(regs, 0); | |
613 | goto out_tsk; | |
614 | } | |
615 | ||
616 | /* PTRACE_DUMPCORE unsupported... */ | |
617 | ||
618 | default: { | |
619 | int err = ptrace_request(child, request, addr, data); | |
620 | if (err) | |
621 | pt_error_return(regs, -err); | |
622 | else | |
623 | pt_succ_return(regs, 0); | |
624 | goto out_tsk; | |
625 | } | |
626 | } | |
1da177e4 LT |
627 | out_tsk: |
628 | if (child) | |
629 | put_task_struct(child); | |
630 | out: | |
631 | unlock_kernel(); | |
632 | } | |
633 | ||
8d8a6479 | 634 | asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p) |
1da177e4 | 635 | { |
bb49bcda | 636 | /* do the secure computing check first */ |
8d8a6479 | 637 | secure_computing(regs->u_regs[UREG_G1]); |
bb49bcda | 638 | |
f7ceba36 DM |
639 | if (unlikely(current->audit_context) && syscall_exit_p) { |
640 | unsigned long tstate = regs->tstate; | |
641 | int result = AUDITSC_SUCCESS; | |
642 | ||
643 | if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) | |
644 | result = AUDITSC_FAILURE; | |
645 | ||
646 | audit_syscall_exit(current, result, regs->u_regs[UREG_I0]); | |
647 | } | |
648 | ||
1da177e4 | 649 | if (!(current->ptrace & PT_PTRACED)) |
f7ceba36 DM |
650 | goto out; |
651 | ||
652 | if (!test_thread_flag(TIF_SYSCALL_TRACE)) | |
653 | goto out; | |
654 | ||
1da177e4 LT |
655 | ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) |
656 | ? 0x80 : 0)); | |
657 | ||
658 | /* | |
659 | * this isn't the same as continuing with a signal, but it will do | |
660 | * for normal use. strace only continues with a signal if the | |
661 | * stopping signal is not SIGTRAP. -brl | |
662 | */ | |
1da177e4 | 663 | if (current->exit_code) { |
bb49bcda | 664 | send_sig(current->exit_code, current, 1); |
1da177e4 LT |
665 | current->exit_code = 0; |
666 | } | |
f7ceba36 DM |
667 | |
668 | out: | |
669 | if (unlikely(current->audit_context) && !syscall_exit_p) | |
670 | audit_syscall_entry(current, | |
671 | (test_thread_flag(TIF_32BIT) ? | |
672 | AUDIT_ARCH_SPARC : | |
673 | AUDIT_ARCH_SPARC64), | |
674 | regs->u_regs[UREG_G1], | |
675 | regs->u_regs[UREG_I0], | |
676 | regs->u_regs[UREG_I1], | |
677 | regs->u_regs[UREG_I2], | |
678 | regs->u_regs[UREG_I3]); | |
1da177e4 | 679 | } |