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> |
717463d8 | 34 | #include <asm/cpudata.h> |
1da177e4 LT |
35 | |
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. | |
40 | */ | |
41 | static inline void pt_error_return(struct pt_regs *regs, unsigned long error) | |
42 | { | |
43 | regs->u_regs[UREG_I0] = error; | |
44 | regs->tstate |= (TSTATE_ICARRY | TSTATE_XCARRY); | |
45 | regs->tpc = regs->tnpc; | |
46 | regs->tnpc += 4; | |
47 | } | |
48 | ||
49 | static inline void pt_succ_return(struct pt_regs *regs, unsigned long value) | |
50 | { | |
51 | regs->u_regs[UREG_I0] = value; | |
52 | regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY); | |
53 | regs->tpc = regs->tnpc; | |
54 | regs->tnpc += 4; | |
55 | } | |
56 | ||
57 | static inline void | |
58 | pt_succ_return_linux(struct pt_regs *regs, unsigned long value, void __user *addr) | |
59 | { | |
60 | if (test_thread_flag(TIF_32BIT)) { | |
61 | if (put_user(value, (unsigned int __user *) addr)) { | |
62 | pt_error_return(regs, EFAULT); | |
63 | return; | |
64 | } | |
65 | } else { | |
66 | if (put_user(value, (long __user *) addr)) { | |
67 | pt_error_return(regs, EFAULT); | |
68 | return; | |
69 | } | |
70 | } | |
71 | regs->u_regs[UREG_I0] = 0; | |
72 | regs->tstate &= ~(TSTATE_ICARRY | TSTATE_XCARRY); | |
73 | regs->tpc = regs->tnpc; | |
74 | regs->tnpc += 4; | |
75 | } | |
76 | ||
77 | static void | |
78 | pt_os_succ_return (struct pt_regs *regs, unsigned long val, void __user *addr) | |
79 | { | |
80 | if (current->personality == PER_SUNOS) | |
81 | pt_succ_return (regs, val); | |
82 | else | |
83 | pt_succ_return_linux (regs, val, addr); | |
84 | } | |
85 | ||
86 | /* #define ALLOW_INIT_TRACING */ | |
87 | /* #define DEBUG_PTRACE */ | |
88 | ||
89 | #ifdef DEBUG_PTRACE | |
90 | char *pt_rq [] = { | |
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", "" | |
98 | }; | |
99 | #endif | |
100 | ||
101 | /* | |
102 | * Called by kernel/ptrace.c when detaching.. | |
103 | * | |
104 | * Make sure single step bits etc are not set. | |
105 | */ | |
106 | void ptrace_disable(struct task_struct *child) | |
107 | { | |
108 | /* nothing to do */ | |
109 | } | |
110 | ||
dadeafdf DM |
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. | |
115 | * | |
116 | * Now, the only thing we have to do is: | |
117 | * 1) flush the D-cache if it's possible than an illegal alias | |
118 | * has been created | |
119 | * 2) flush the I-cache if this is pre-cheetah and we did a write | |
120 | */ | |
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) | |
124 | { | |
125 | BUG_ON(len > PAGE_SIZE); | |
126 | ||
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 | |
131 | * D-cache flush. | |
132 | */ | |
6a9b490d | 133 | if ((uaddr ^ (unsigned long) kaddr) & (1UL << 13)) { |
dadeafdf DM |
134 | unsigned long start = __pa(kaddr); |
135 | unsigned long end = start + len; | |
717463d8 DM |
136 | unsigned long dcache_line_size; |
137 | ||
138 | dcache_line_size = local_cpu_data().dcache_line_size; | |
dadeafdf DM |
139 | |
140 | if (tlb_type == spitfire) { | |
717463d8 | 141 | for (; start < end; start += dcache_line_size) |
6a9b490d | 142 | spitfire_put_dcache_tag(start & 0x3fe0, 0x0); |
dadeafdf | 143 | } else { |
717463d8 DM |
144 | start &= ~(dcache_line_size - 1); |
145 | for (; start < end; start += dcache_line_size) | |
dadeafdf DM |
146 | __asm__ __volatile__( |
147 | "stxa %%g0, [%0] %1\n\t" | |
148 | "membar #Sync" | |
149 | : /* no outputs */ | |
6a9b490d | 150 | : "r" (start), |
dadeafdf DM |
151 | "i" (ASI_DCACHE_INVALIDATE)); |
152 | } | |
153 | } | |
154 | #endif | |
155 | if (write && tlb_type == spitfire) { | |
156 | unsigned long start = (unsigned long) kaddr; | |
157 | unsigned long end = start + len; | |
717463d8 DM |
158 | unsigned long icache_line_size; |
159 | ||
160 | icache_line_size = local_cpu_data().icache_line_size; | |
dadeafdf | 161 | |
717463d8 | 162 | for (; start < end; start += icache_line_size) |
dadeafdf DM |
163 | flushi(start); |
164 | } | |
165 | } | |
166 | ||
1da177e4 LT |
167 | asmlinkage void do_ptrace(struct pt_regs *regs) |
168 | { | |
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; | |
175 | int ret; | |
176 | ||
177 | if (test_thread_flag(TIF_32BIT)) { | |
178 | addr &= 0xffffffffUL; | |
179 | data &= 0xffffffffUL; | |
180 | addr2 &= 0xffffffffUL; | |
181 | } | |
182 | lock_kernel(); | |
183 | #ifdef DEBUG_PTRACE | |
184 | { | |
185 | char *s; | |
186 | ||
187 | if ((request >= 0) && (request <= 24)) | |
188 | s = pt_rq [request]; | |
189 | else | |
190 | s = "unknown"; | |
191 | ||
192 | if (request == PTRACE_POKEDATA && data == 0x91d02001){ | |
193 | printk ("do_ptrace: breakpoint pid=%d, addr=%016lx addr2=%016lx\n", | |
194 | pid, addr, addr2); | |
195 | } else | |
196 | printk("do_ptrace: rq=%s(%d) pid=%d addr=%016lx data=%016lx addr2=%016lx\n", | |
197 | s, request, pid, addr, data, addr2); | |
198 | } | |
199 | #endif | |
200 | if (request == PTRACE_TRACEME) { | |
6b9c7ed8 | 201 | ret = ptrace_traceme(); |
1da177e4 LT |
202 | pt_succ_return(regs, 0); |
203 | goto out; | |
204 | } | |
6b9c7ed8 CH |
205 | |
206 | child = ptrace_get_task_struct(pid); | |
207 | if (IS_ERR(child)) { | |
208 | ret = PTR_ERR(child); | |
209 | pt_error_return(regs, -ret); | |
1da177e4 LT |
210 | goto out; |
211 | } | |
212 | ||
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); | |
217 | goto out_tsk; | |
218 | } | |
219 | pt_succ_return(regs, 0); | |
220 | goto out_tsk; | |
221 | } | |
222 | ||
223 | ret = ptrace_check_attach(child, request == PTRACE_KILL); | |
224 | if (ret < 0) { | |
225 | pt_error_return(regs, -ret); | |
226 | goto out_tsk; | |
227 | } | |
228 | ||
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... */ | |
241 | } | |
242 | ||
243 | switch(request) { | |
244 | case PTRACE_PEEKTEXT: /* read word at location addr. */ | |
245 | case PTRACE_PEEKDATA: { | |
246 | unsigned long tmp64; | |
247 | unsigned int tmp32; | |
248 | int res, copied; | |
249 | ||
250 | res = -EIO; | |
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)) | |
256 | res = 0; | |
257 | } else { | |
258 | copied = access_process_vm(child, addr, | |
259 | &tmp64, sizeof(tmp64), 0); | |
260 | if (copied == sizeof(tmp64)) | |
261 | res = 0; | |
262 | } | |
263 | if (res < 0) | |
264 | pt_error_return(regs, -res); | |
265 | else | |
266 | pt_os_succ_return(regs, tmp64, (void __user *) data); | |
dadeafdf | 267 | goto out_tsk; |
1da177e4 LT |
268 | } |
269 | ||
270 | case PTRACE_POKETEXT: /* write the word at location addr. */ | |
271 | case PTRACE_POKEDATA: { | |
272 | unsigned long tmp64; | |
273 | unsigned int tmp32; | |
274 | int copied, res = -EIO; | |
275 | ||
276 | if (test_thread_flag(TIF_32BIT)) { | |
277 | tmp32 = data; | |
278 | copied = access_process_vm(child, addr, | |
279 | &tmp32, sizeof(tmp32), 1); | |
280 | if (copied == sizeof(tmp32)) | |
281 | res = 0; | |
282 | } else { | |
283 | tmp64 = data; | |
284 | copied = access_process_vm(child, addr, | |
285 | &tmp64, sizeof(tmp64), 1); | |
286 | if (copied == sizeof(tmp64)) | |
287 | res = 0; | |
288 | } | |
289 | if (res < 0) | |
290 | pt_error_return(regs, -res); | |
291 | else | |
292 | pt_succ_return(regs, res); | |
dadeafdf | 293 | goto out_tsk; |
1da177e4 LT |
294 | } |
295 | ||
296 | case PTRACE_GETREGS: { | |
297 | struct pt_regs32 __user *pregs = | |
298 | (struct pt_regs32 __user *) addr; | |
299 | struct pt_regs *cregs = child->thread_info->kregs; | |
300 | int rval; | |
301 | ||
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); | |
307 | goto out_tsk; | |
308 | } | |
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); | |
312 | goto out_tsk; | |
313 | } | |
314 | pt_succ_return(regs, 0); | |
315 | #ifdef DEBUG_PTRACE | |
316 | printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]); | |
317 | #endif | |
318 | goto out_tsk; | |
319 | } | |
320 | ||
321 | case PTRACE_GETREGS64: { | |
322 | struct pt_regs __user *pregs = (struct pt_regs __user *) addr; | |
323 | struct pt_regs *cregs = child->thread_info->kregs; | |
324 | unsigned long tpc = cregs->tpc; | |
325 | int rval; | |
326 | ||
327 | if ((child->thread_info->flags & _TIF_32BIT) != 0) | |
328 | tpc &= 0xffffffff; | |
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); | |
334 | goto out_tsk; | |
335 | } | |
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); | |
339 | goto out_tsk; | |
340 | } | |
341 | pt_succ_return(regs, 0); | |
342 | #ifdef DEBUG_PTRACE | |
343 | printk ("PC=%lx nPC=%lx o7=%lx\n", cregs->tpc, cregs->tnpc, cregs->u_regs [15]); | |
344 | #endif | |
345 | goto out_tsk; | |
346 | } | |
347 | ||
348 | case PTRACE_SETREGS: { | |
349 | struct pt_regs32 __user *pregs = | |
350 | (struct pt_regs32 __user *) addr; | |
351 | struct pt_regs *cregs = child->thread_info->kregs; | |
352 | unsigned int psr, pc, npc, y; | |
353 | int i; | |
354 | ||
355 | /* Must be careful, tracing process can only set certain | |
356 | * bits in the psr. | |
357 | */ | |
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); | |
363 | goto out_tsk; | |
364 | } | |
365 | cregs->tstate &= ~(TSTATE_ICC); | |
366 | cregs->tstate |= psr_to_tstate_icc(psr); | |
367 | if (!((pc | npc) & 3)) { | |
368 | cregs->tpc = pc; | |
369 | cregs->tnpc = npc; | |
370 | } | |
371 | cregs->y = y; | |
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); | |
375 | goto out_tsk; | |
376 | } | |
377 | } | |
378 | pt_succ_return(regs, 0); | |
379 | goto out_tsk; | |
380 | } | |
381 | ||
382 | case PTRACE_SETREGS64: { | |
383 | struct pt_regs __user *pregs = (struct pt_regs __user *) addr; | |
384 | struct pt_regs *cregs = child->thread_info->kregs; | |
385 | unsigned long tstate, tpc, tnpc, y; | |
386 | int i; | |
387 | ||
388 | /* Must be careful, tracing process can only set certain | |
389 | * bits in the psr. | |
390 | */ | |
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); | |
396 | goto out_tsk; | |
397 | } | |
398 | if ((child->thread_info->flags & _TIF_32BIT) != 0) { | |
399 | tpc &= 0xffffffff; | |
400 | tnpc &= 0xffffffff; | |
401 | } | |
402 | tstate &= (TSTATE_ICC | TSTATE_XCC); | |
403 | cregs->tstate &= ~(TSTATE_ICC | TSTATE_XCC); | |
404 | cregs->tstate |= tstate; | |
405 | if (!((tpc | tnpc) & 3)) { | |
406 | cregs->tpc = tpc; | |
407 | cregs->tnpc = tnpc; | |
408 | } | |
409 | cregs->y = y; | |
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); | |
413 | goto out_tsk; | |
414 | } | |
415 | } | |
416 | pt_succ_return(regs, 0); | |
417 | goto out_tsk; | |
418 | } | |
419 | ||
420 | case PTRACE_GETFPREGS: { | |
421 | struct fps { | |
422 | unsigned int regs[32]; | |
423 | unsigned int fsr; | |
424 | unsigned int flags; | |
425 | unsigned int extra; | |
426 | unsigned int fpqd; | |
427 | struct fq { | |
428 | unsigned int insnaddr; | |
429 | unsigned int insn; | |
430 | } fpq[16]; | |
431 | }; | |
432 | struct fps __user *fps = (struct fps __user *) addr; | |
433 | unsigned long *fpregs = child->thread_info->fpregs; | |
434 | ||
435 | if (copy_to_user(&fps->regs[0], fpregs, | |
436 | (32 * sizeof(unsigned int))) || | |
437 | __put_user(child->thread_info->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); | |
443 | goto out_tsk; | |
444 | } | |
445 | pt_succ_return(regs, 0); | |
446 | goto out_tsk; | |
447 | } | |
448 | ||
449 | case PTRACE_GETFPREGS64: { | |
450 | struct fps { | |
451 | unsigned int regs[64]; | |
452 | unsigned long fsr; | |
453 | }; | |
454 | struct fps __user *fps = (struct fps __user *) addr; | |
455 | unsigned long *fpregs = child->thread_info->fpregs; | |
456 | ||
457 | if (copy_to_user(&fps->regs[0], fpregs, | |
458 | (64 * sizeof(unsigned int))) || | |
459 | __put_user(child->thread_info->xfsr[0], (&fps->fsr))) { | |
460 | pt_error_return(regs, EFAULT); | |
461 | goto out_tsk; | |
462 | } | |
463 | pt_succ_return(regs, 0); | |
464 | goto out_tsk; | |
465 | } | |
466 | ||
467 | case PTRACE_SETFPREGS: { | |
468 | struct fps { | |
469 | unsigned int regs[32]; | |
470 | unsigned int fsr; | |
471 | unsigned int flags; | |
472 | unsigned int extra; | |
473 | unsigned int fpqd; | |
474 | struct fq { | |
475 | unsigned int insnaddr; | |
476 | unsigned int insn; | |
477 | } fpq[16]; | |
478 | }; | |
479 | struct fps __user *fps = (struct fps __user *) addr; | |
480 | unsigned long *fpregs = child->thread_info->fpregs; | |
481 | unsigned fsr; | |
482 | ||
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); | |
487 | goto out_tsk; | |
488 | } | |
489 | child->thread_info->xfsr[0] &= 0xffffffff00000000UL; | |
490 | child->thread_info->xfsr[0] |= fsr; | |
491 | if (!(child->thread_info->fpsaved[0] & FPRS_FEF)) | |
492 | child->thread_info->gsr[0] = 0; | |
493 | child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL); | |
494 | pt_succ_return(regs, 0); | |
495 | goto out_tsk; | |
496 | } | |
497 | ||
498 | case PTRACE_SETFPREGS64: { | |
499 | struct fps { | |
500 | unsigned int regs[64]; | |
501 | unsigned long fsr; | |
502 | }; | |
503 | struct fps __user *fps = (struct fps __user *) addr; | |
504 | unsigned long *fpregs = child->thread_info->fpregs; | |
505 | ||
506 | if (copy_from_user(fpregs, &fps->regs[0], | |
507 | (64 * sizeof(unsigned int))) || | |
508 | __get_user(child->thread_info->xfsr[0], (&fps->fsr))) { | |
509 | pt_error_return(regs, EFAULT); | |
510 | goto out_tsk; | |
511 | } | |
512 | if (!(child->thread_info->fpsaved[0] & FPRS_FEF)) | |
513 | child->thread_info->gsr[0] = 0; | |
514 | child->thread_info->fpsaved[0] |= (FPRS_FEF | FPRS_DL | FPRS_DU); | |
515 | pt_succ_return(regs, 0); | |
516 | goto out_tsk; | |
517 | } | |
518 | ||
519 | case PTRACE_READTEXT: | |
520 | case PTRACE_READDATA: { | |
521 | int res = ptrace_readdata(child, addr, | |
522 | (char __user *)addr2, data); | |
523 | if (res == data) { | |
524 | pt_succ_return(regs, 0); | |
dadeafdf | 525 | goto out_tsk; |
1da177e4 LT |
526 | } |
527 | if (res >= 0) | |
528 | res = -EIO; | |
529 | pt_error_return(regs, -res); | |
dadeafdf | 530 | goto out_tsk; |
1da177e4 LT |
531 | } |
532 | ||
533 | case PTRACE_WRITETEXT: | |
534 | case PTRACE_WRITEDATA: { | |
535 | int res = ptrace_writedata(child, (char __user *) addr2, | |
536 | addr, data); | |
537 | if (res == data) { | |
538 | pt_succ_return(regs, 0); | |
dadeafdf | 539 | goto out_tsk; |
1da177e4 LT |
540 | } |
541 | if (res >= 0) | |
542 | res = -EIO; | |
543 | pt_error_return(regs, -res); | |
dadeafdf | 544 | goto out_tsk; |
1da177e4 LT |
545 | } |
546 | case PTRACE_SYSCALL: /* continue and stop at (return from) syscall */ | |
547 | addr = 1; | |
548 | ||
549 | case PTRACE_CONT: { /* restart after signal. */ | |
7ed20e1a | 550 | if (!valid_signal(data)) { |
1da177e4 LT |
551 | pt_error_return(regs, EIO); |
552 | goto out_tsk; | |
553 | } | |
1da177e4 LT |
554 | |
555 | if (request == PTRACE_SYSCALL) { | |
556 | set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
557 | } else { | |
558 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
559 | } | |
560 | ||
561 | child->exit_code = data; | |
562 | #ifdef DEBUG_PTRACE | |
563 | printk("CONT: %s [%d]: set exit_code = %x %lx %lx\n", child->comm, | |
564 | child->pid, child->exit_code, | |
565 | child->thread_info->kregs->tpc, | |
566 | child->thread_info->kregs->tnpc); | |
567 | ||
568 | #endif | |
569 | wake_up_process(child); | |
570 | pt_succ_return(regs, 0); | |
571 | goto out_tsk; | |
572 | } | |
573 | ||
574 | /* | |
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 | |
577 | * exit. | |
578 | */ | |
579 | case PTRACE_KILL: { | |
580 | if (child->exit_state == EXIT_ZOMBIE) { /* already dead */ | |
581 | pt_succ_return(regs, 0); | |
582 | goto out_tsk; | |
583 | } | |
584 | child->exit_code = SIGKILL; | |
585 | wake_up_process(child); | |
586 | pt_succ_return(regs, 0); | |
587 | goto out_tsk; | |
588 | } | |
589 | ||
590 | case PTRACE_SUNDETACH: { /* detach a process that was attached. */ | |
591 | int error = ptrace_detach(child, data); | |
592 | if (error) { | |
593 | pt_error_return(regs, EIO); | |
594 | goto out_tsk; | |
595 | } | |
596 | pt_succ_return(regs, 0); | |
597 | goto out_tsk; | |
598 | } | |
599 | ||
600 | /* PTRACE_DUMPCORE unsupported... */ | |
601 | ||
602 | default: { | |
603 | int err = ptrace_request(child, request, addr, data); | |
604 | if (err) | |
605 | pt_error_return(regs, -err); | |
606 | else | |
607 | pt_succ_return(regs, 0); | |
608 | goto out_tsk; | |
609 | } | |
610 | } | |
1da177e4 LT |
611 | out_tsk: |
612 | if (child) | |
613 | put_task_struct(child); | |
614 | out: | |
615 | unlock_kernel(); | |
616 | } | |
617 | ||
8d8a6479 | 618 | asmlinkage void syscall_trace(struct pt_regs *regs, int syscall_exit_p) |
1da177e4 | 619 | { |
bb49bcda | 620 | /* do the secure computing check first */ |
8d8a6479 | 621 | secure_computing(regs->u_regs[UREG_G1]); |
bb49bcda | 622 | |
f7ceba36 DM |
623 | if (unlikely(current->audit_context) && syscall_exit_p) { |
624 | unsigned long tstate = regs->tstate; | |
625 | int result = AUDITSC_SUCCESS; | |
626 | ||
627 | if (unlikely(tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) | |
628 | result = AUDITSC_FAILURE; | |
629 | ||
630 | audit_syscall_exit(current, result, regs->u_regs[UREG_I0]); | |
631 | } | |
632 | ||
1da177e4 | 633 | if (!(current->ptrace & PT_PTRACED)) |
f7ceba36 DM |
634 | goto out; |
635 | ||
636 | if (!test_thread_flag(TIF_SYSCALL_TRACE)) | |
637 | goto out; | |
638 | ||
1da177e4 LT |
639 | ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) |
640 | ? 0x80 : 0)); | |
641 | ||
642 | /* | |
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 | |
646 | */ | |
1da177e4 | 647 | if (current->exit_code) { |
bb49bcda | 648 | send_sig(current->exit_code, current, 1); |
1da177e4 LT |
649 | current->exit_code = 0; |
650 | } | |
f7ceba36 DM |
651 | |
652 | out: | |
653 | if (unlikely(current->audit_context) && !syscall_exit_p) | |
654 | audit_syscall_entry(current, | |
655 | (test_thread_flag(TIF_32BIT) ? | |
656 | AUDIT_ARCH_SPARC : | |
657 | AUDIT_ARCH_SPARC64), | |
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]); | |
1da177e4 | 663 | } |