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1da177e4 LT |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1992 Ross Biro | |
7 | * Copyright (C) Linus Torvalds | |
8 | * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle | |
9 | * Copyright (C) 1996 David S. Miller | |
10 | * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com | |
11 | * Copyright (C) 1999 MIPS Technologies, Inc. | |
12 | * Copyright (C) 2000 Ulf Carlsson | |
13 | * | |
14 | * At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit | |
15 | * binaries. | |
16 | */ | |
17 | #include <linux/config.h> | |
18 | #include <linux/compiler.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/ptrace.h> | |
24 | #include <linux/audit.h> | |
25 | #include <linux/smp.h> | |
26 | #include <linux/smp_lock.h> | |
27 | #include <linux/user.h> | |
28 | #include <linux/security.h> | |
7ed20e1a | 29 | #include <linux/signal.h> |
1da177e4 | 30 | |
f8280c8d | 31 | #include <asm/byteorder.h> |
1da177e4 | 32 | #include <asm/cpu.h> |
e50c0a8f | 33 | #include <asm/dsp.h> |
1da177e4 LT |
34 | #include <asm/fpu.h> |
35 | #include <asm/mipsregs.h> | |
36 | #include <asm/pgtable.h> | |
37 | #include <asm/page.h> | |
38 | #include <asm/system.h> | |
39 | #include <asm/uaccess.h> | |
40 | #include <asm/bootinfo.h> | |
ea3d710f | 41 | #include <asm/reg.h> |
1da177e4 LT |
42 | |
43 | /* | |
44 | * Called by kernel/ptrace.c when detaching.. | |
45 | * | |
46 | * Make sure single step bits etc are not set. | |
47 | */ | |
48 | void ptrace_disable(struct task_struct *child) | |
49 | { | |
50 | /* Nothing to do.. */ | |
51 | } | |
52 | ||
ea3d710f DJ |
53 | /* |
54 | * Read a general register set. We always use the 64-bit format, even | |
55 | * for 32-bit kernels and for 32-bit processes on a 64-bit kernel. | |
56 | * Registers are sign extended to fill the available space. | |
57 | */ | |
58 | int ptrace_getregs (struct task_struct *child, __s64 __user *data) | |
59 | { | |
60 | struct pt_regs *regs; | |
61 | int i; | |
62 | ||
63 | if (!access_ok(VERIFY_WRITE, data, 38 * 8)) | |
64 | return -EIO; | |
65 | ||
66 | regs = (struct pt_regs *) ((unsigned long) child->thread_info + | |
67 | THREAD_SIZE - 32 - sizeof(struct pt_regs)); | |
68 | ||
69 | for (i = 0; i < 32; i++) | |
70 | __put_user (regs->regs[i], data + i); | |
71 | __put_user (regs->lo, data + EF_LO - EF_R0); | |
72 | __put_user (regs->hi, data + EF_HI - EF_R0); | |
73 | __put_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0); | |
74 | __put_user (regs->cp0_badvaddr, data + EF_CP0_BADVADDR - EF_R0); | |
75 | __put_user (regs->cp0_status, data + EF_CP0_STATUS - EF_R0); | |
76 | __put_user (regs->cp0_cause, data + EF_CP0_CAUSE - EF_R0); | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
81 | /* | |
82 | * Write a general register set. As for PTRACE_GETREGS, we always use | |
83 | * the 64-bit format. On a 32-bit kernel only the lower order half | |
84 | * (according to endianness) will be used. | |
85 | */ | |
86 | int ptrace_setregs (struct task_struct *child, __s64 __user *data) | |
87 | { | |
88 | struct pt_regs *regs; | |
89 | int i; | |
90 | ||
91 | if (!access_ok(VERIFY_READ, data, 38 * 8)) | |
92 | return -EIO; | |
93 | ||
94 | regs = (struct pt_regs *) ((unsigned long) child->thread_info + | |
95 | THREAD_SIZE - 32 - sizeof(struct pt_regs)); | |
96 | ||
97 | for (i = 0; i < 32; i++) | |
98 | __get_user (regs->regs[i], data + i); | |
99 | __get_user (regs->lo, data + EF_LO - EF_R0); | |
100 | __get_user (regs->hi, data + EF_HI - EF_R0); | |
101 | __get_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0); | |
102 | ||
103 | /* badvaddr, status, and cause may not be written. */ | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | int ptrace_getfpregs (struct task_struct *child, __u32 __user *data) | |
109 | { | |
110 | int i; | |
111 | ||
112 | if (!access_ok(VERIFY_WRITE, data, 33 * 8)) | |
113 | return -EIO; | |
114 | ||
115 | if (tsk_used_math(child)) { | |
116 | fpureg_t *fregs = get_fpu_regs(child); | |
117 | for (i = 0; i < 32; i++) | |
118 | __put_user (fregs[i], i + (__u64 __user *) data); | |
119 | } else { | |
120 | for (i = 0; i < 32; i++) | |
121 | __put_user ((__u64) -1, i + (__u64 __user *) data); | |
122 | } | |
123 | ||
124 | if (cpu_has_fpu) { | |
125 | unsigned int flags, tmp; | |
126 | ||
127 | __put_user (child->thread.fpu.hard.fcr31, data + 64); | |
128 | ||
129 | flags = read_c0_status(); | |
130 | __enable_fpu(); | |
131 | __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp)); | |
132 | write_c0_status(flags); | |
133 | __put_user (tmp, data + 65); | |
134 | } else { | |
135 | __put_user (child->thread.fpu.soft.fcr31, data + 64); | |
136 | __put_user ((__u32) 0, data + 65); | |
137 | } | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | int ptrace_setfpregs (struct task_struct *child, __u32 __user *data) | |
143 | { | |
144 | fpureg_t *fregs; | |
145 | int i; | |
146 | ||
147 | if (!access_ok(VERIFY_READ, data, 33 * 8)) | |
148 | return -EIO; | |
149 | ||
150 | fregs = get_fpu_regs(child); | |
151 | ||
152 | for (i = 0; i < 32; i++) | |
153 | __get_user (fregs[i], i + (__u64 __user *) data); | |
154 | ||
155 | if (cpu_has_fpu) | |
156 | __get_user (child->thread.fpu.hard.fcr31, data + 64); | |
157 | else | |
158 | __get_user (child->thread.fpu.soft.fcr31, data + 64); | |
159 | ||
160 | /* FIR may not be written. */ | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
1da177e4 LT |
165 | asmlinkage int sys_ptrace(long request, long pid, long addr, long data) |
166 | { | |
167 | struct task_struct *child; | |
168 | int ret; | |
169 | ||
170 | #if 0 | |
171 | printk("ptrace(r=%d,pid=%d,addr=%08lx,data=%08lx)\n", | |
172 | (int) request, (int) pid, (unsigned long) addr, | |
173 | (unsigned long) data); | |
174 | #endif | |
175 | lock_kernel(); | |
176 | ret = -EPERM; | |
177 | if (request == PTRACE_TRACEME) { | |
178 | /* are we already being traced? */ | |
179 | if (current->ptrace & PT_PTRACED) | |
180 | goto out; | |
181 | if ((ret = security_ptrace(current->parent, current))) | |
182 | goto out; | |
183 | /* set the ptrace bit in the process flags. */ | |
184 | current->ptrace |= PT_PTRACED; | |
185 | ret = 0; | |
186 | goto out; | |
187 | } | |
188 | ret = -ESRCH; | |
189 | read_lock(&tasklist_lock); | |
190 | child = find_task_by_pid(pid); | |
191 | if (child) | |
192 | get_task_struct(child); | |
193 | read_unlock(&tasklist_lock); | |
194 | if (!child) | |
195 | goto out; | |
196 | ||
197 | ret = -EPERM; | |
198 | if (pid == 1) /* you may not mess with init */ | |
199 | goto out_tsk; | |
200 | ||
201 | if (request == PTRACE_ATTACH) { | |
202 | ret = ptrace_attach(child); | |
203 | goto out_tsk; | |
204 | } | |
205 | ||
206 | ret = ptrace_check_attach(child, request == PTRACE_KILL); | |
207 | if (ret < 0) | |
208 | goto out_tsk; | |
209 | ||
210 | switch (request) { | |
211 | /* when I and D space are separate, these will need to be fixed. */ | |
212 | case PTRACE_PEEKTEXT: /* read word at location addr. */ | |
213 | case PTRACE_PEEKDATA: { | |
214 | unsigned long tmp; | |
215 | int copied; | |
216 | ||
217 | copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); | |
218 | ret = -EIO; | |
219 | if (copied != sizeof(tmp)) | |
220 | break; | |
fe00f943 | 221 | ret = put_user(tmp,(unsigned long __user *) data); |
1da177e4 LT |
222 | break; |
223 | } | |
224 | ||
225 | /* Read the word at location addr in the USER area. */ | |
226 | case PTRACE_PEEKUSR: { | |
227 | struct pt_regs *regs; | |
228 | unsigned long tmp = 0; | |
229 | ||
230 | regs = (struct pt_regs *) ((unsigned long) child->thread_info + | |
231 | THREAD_SIZE - 32 - sizeof(struct pt_regs)); | |
232 | ret = 0; /* Default return value. */ | |
233 | ||
234 | switch (addr) { | |
235 | case 0 ... 31: | |
236 | tmp = regs->regs[addr]; | |
237 | break; | |
238 | case FPR_BASE ... FPR_BASE + 31: | |
239 | if (tsk_used_math(child)) { | |
240 | fpureg_t *fregs = get_fpu_regs(child); | |
241 | ||
875d43e7 | 242 | #ifdef CONFIG_32BIT |
1da177e4 LT |
243 | /* |
244 | * The odd registers are actually the high | |
245 | * order bits of the values stored in the even | |
246 | * registers - unless we're using r2k_switch.S. | |
247 | */ | |
248 | if (addr & 1) | |
249 | tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32); | |
250 | else | |
251 | tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff); | |
252 | #endif | |
875d43e7 | 253 | #ifdef CONFIG_64BIT |
1da177e4 LT |
254 | tmp = fregs[addr - FPR_BASE]; |
255 | #endif | |
256 | } else { | |
257 | tmp = -1; /* FP not yet used */ | |
258 | } | |
259 | break; | |
260 | case PC: | |
261 | tmp = regs->cp0_epc; | |
262 | break; | |
263 | case CAUSE: | |
264 | tmp = regs->cp0_cause; | |
265 | break; | |
266 | case BADVADDR: | |
267 | tmp = regs->cp0_badvaddr; | |
268 | break; | |
269 | case MMHI: | |
270 | tmp = regs->hi; | |
271 | break; | |
272 | case MMLO: | |
273 | tmp = regs->lo; | |
274 | break; | |
275 | case FPC_CSR: | |
276 | if (cpu_has_fpu) | |
277 | tmp = child->thread.fpu.hard.fcr31; | |
278 | else | |
279 | tmp = child->thread.fpu.soft.fcr31; | |
280 | break; | |
281 | case FPC_EIR: { /* implementation / version register */ | |
282 | unsigned int flags; | |
283 | ||
284 | if (!cpu_has_fpu) | |
285 | break; | |
286 | ||
287 | flags = read_c0_status(); | |
288 | __enable_fpu(); | |
289 | __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp)); | |
290 | write_c0_status(flags); | |
291 | break; | |
292 | } | |
c134a5ec RB |
293 | case DSP_BASE ... DSP_BASE + 5: { |
294 | dspreg_t *dregs; | |
295 | ||
e50c0a8f RB |
296 | if (!cpu_has_dsp) { |
297 | tmp = 0; | |
298 | ret = -EIO; | |
299 | goto out_tsk; | |
300 | } | |
301 | if (child->thread.dsp.used_dsp) { | |
c134a5ec | 302 | dregs = __get_dsp_regs(child); |
e50c0a8f RB |
303 | tmp = (unsigned long) (dregs[addr - DSP_BASE]); |
304 | } else { | |
305 | tmp = -1; /* DSP registers yet used */ | |
306 | } | |
307 | break; | |
c134a5ec | 308 | } |
e50c0a8f RB |
309 | case DSP_CONTROL: |
310 | if (!cpu_has_dsp) { | |
311 | tmp = 0; | |
312 | ret = -EIO; | |
313 | goto out_tsk; | |
314 | } | |
315 | tmp = child->thread.dsp.dspcontrol; | |
316 | break; | |
1da177e4 LT |
317 | default: |
318 | tmp = 0; | |
319 | ret = -EIO; | |
320 | goto out_tsk; | |
321 | } | |
fe00f943 | 322 | ret = put_user(tmp, (unsigned long __user *) data); |
1da177e4 LT |
323 | break; |
324 | } | |
325 | ||
326 | /* when I and D space are separate, this will have to be fixed. */ | |
327 | case PTRACE_POKETEXT: /* write the word at location addr. */ | |
328 | case PTRACE_POKEDATA: | |
329 | ret = 0; | |
330 | if (access_process_vm(child, addr, &data, sizeof(data), 1) | |
331 | == sizeof(data)) | |
332 | break; | |
333 | ret = -EIO; | |
334 | break; | |
335 | ||
336 | case PTRACE_POKEUSR: { | |
337 | struct pt_regs *regs; | |
338 | ret = 0; | |
339 | regs = (struct pt_regs *) ((unsigned long) child->thread_info + | |
340 | THREAD_SIZE - 32 - sizeof(struct pt_regs)); | |
341 | ||
342 | switch (addr) { | |
343 | case 0 ... 31: | |
344 | regs->regs[addr] = data; | |
345 | break; | |
346 | case FPR_BASE ... FPR_BASE + 31: { | |
347 | fpureg_t *fregs = get_fpu_regs(child); | |
348 | ||
349 | if (!tsk_used_math(child)) { | |
350 | /* FP not yet used */ | |
351 | memset(&child->thread.fpu.hard, ~0, | |
352 | sizeof(child->thread.fpu.hard)); | |
353 | child->thread.fpu.hard.fcr31 = 0; | |
354 | } | |
875d43e7 | 355 | #ifdef CONFIG_32BIT |
1da177e4 LT |
356 | /* |
357 | * The odd registers are actually the high order bits | |
358 | * of the values stored in the even registers - unless | |
359 | * we're using r2k_switch.S. | |
360 | */ | |
361 | if (addr & 1) { | |
362 | fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff; | |
363 | fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32; | |
364 | } else { | |
365 | fregs[addr - FPR_BASE] &= ~0xffffffffLL; | |
366 | fregs[addr - FPR_BASE] |= data; | |
367 | } | |
368 | #endif | |
875d43e7 | 369 | #ifdef CONFIG_64BIT |
1da177e4 LT |
370 | fregs[addr - FPR_BASE] = data; |
371 | #endif | |
372 | break; | |
373 | } | |
374 | case PC: | |
375 | regs->cp0_epc = data; | |
376 | break; | |
377 | case MMHI: | |
378 | regs->hi = data; | |
379 | break; | |
380 | case MMLO: | |
381 | regs->lo = data; | |
382 | break; | |
383 | case FPC_CSR: | |
384 | if (cpu_has_fpu) | |
385 | child->thread.fpu.hard.fcr31 = data; | |
386 | else | |
387 | child->thread.fpu.soft.fcr31 = data; | |
388 | break; | |
c134a5ec RB |
389 | case DSP_BASE ... DSP_BASE + 5: { |
390 | dspreg_t *dregs; | |
391 | ||
e50c0a8f RB |
392 | if (!cpu_has_dsp) { |
393 | ret = -EIO; | |
394 | break; | |
395 | } | |
396 | ||
c134a5ec | 397 | dregs = __get_dsp_regs(child); |
e50c0a8f RB |
398 | dregs[addr - DSP_BASE] = data; |
399 | break; | |
c134a5ec | 400 | } |
e50c0a8f RB |
401 | case DSP_CONTROL: |
402 | if (!cpu_has_dsp) { | |
403 | ret = -EIO; | |
404 | break; | |
405 | } | |
406 | child->thread.dsp.dspcontrol = data; | |
407 | break; | |
1da177e4 LT |
408 | default: |
409 | /* The rest are not allowed. */ | |
410 | ret = -EIO; | |
411 | break; | |
412 | } | |
413 | break; | |
414 | } | |
415 | ||
ea3d710f DJ |
416 | case PTRACE_GETREGS: |
417 | ret = ptrace_getregs (child, (__u64 __user *) data); | |
418 | break; | |
419 | ||
420 | case PTRACE_SETREGS: | |
421 | ret = ptrace_setregs (child, (__u64 __user *) data); | |
422 | break; | |
423 | ||
424 | case PTRACE_GETFPREGS: | |
425 | ret = ptrace_getfpregs (child, (__u32 __user *) data); | |
426 | break; | |
427 | ||
428 | case PTRACE_SETFPREGS: | |
429 | ret = ptrace_setfpregs (child, (__u32 __user *) data); | |
430 | break; | |
431 | ||
1da177e4 LT |
432 | case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ |
433 | case PTRACE_CONT: { /* restart after signal. */ | |
434 | ret = -EIO; | |
7ed20e1a | 435 | if (!valid_signal(data)) |
1da177e4 LT |
436 | break; |
437 | if (request == PTRACE_SYSCALL) { | |
438 | set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
439 | } | |
440 | else { | |
441 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
442 | } | |
443 | child->exit_code = data; | |
444 | wake_up_process(child); | |
445 | ret = 0; | |
446 | break; | |
447 | } | |
448 | ||
449 | /* | |
450 | * make the child exit. Best I can do is send it a sigkill. | |
451 | * perhaps it should be put in the status that it wants to | |
452 | * exit. | |
453 | */ | |
454 | case PTRACE_KILL: | |
455 | ret = 0; | |
456 | if (child->exit_state == EXIT_ZOMBIE) /* already dead */ | |
457 | break; | |
458 | child->exit_code = SIGKILL; | |
459 | wake_up_process(child); | |
460 | break; | |
461 | ||
462 | case PTRACE_DETACH: /* detach a process that was attached. */ | |
463 | ret = ptrace_detach(child, data); | |
464 | break; | |
465 | ||
3c37026d RB |
466 | case PTRACE_GET_THREAD_AREA: |
467 | ret = put_user(child->thread_info->tp_value, | |
468 | (unsigned long __user *) data); | |
469 | break; | |
470 | ||
1da177e4 LT |
471 | default: |
472 | ret = ptrace_request(child, request, addr, data); | |
473 | break; | |
474 | } | |
475 | ||
476 | out_tsk: | |
477 | put_task_struct(child); | |
478 | out: | |
479 | unlock_kernel(); | |
480 | return ret; | |
481 | } | |
482 | ||
67eb81e1 | 483 | static inline int audit_arch(void) |
2fd6f58b | 484 | { |
f8280c8d | 485 | int arch = EM_MIPS; |
875d43e7 | 486 | #ifdef CONFIG_64BIT |
f8280c8d RB |
487 | arch |= __AUDIT_ARCH_64BIT; |
488 | #endif | |
489 | #if defined(__LITTLE_ENDIAN) | |
490 | arch |= __AUDIT_ARCH_LE; | |
491 | #endif | |
492 | return arch; | |
2fd6f58b DW |
493 | } |
494 | ||
1da177e4 LT |
495 | /* |
496 | * Notification of system call entry/exit | |
497 | * - triggered by current->work.syscall_trace | |
498 | */ | |
499 | asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit) | |
500 | { | |
2fd6f58b | 501 | if (unlikely(current->audit_context) && entryexit) |
f8280c8d RB |
502 | audit_syscall_exit(current, AUDITSC_RESULT(regs->regs[2]), |
503 | regs->regs[2]); | |
1da177e4 | 504 | |
1da177e4 | 505 | if (!(current->ptrace & PT_PTRACED)) |
2fd6f58b | 506 | goto out; |
f8280c8d RB |
507 | if (!test_thread_flag(TIF_SYSCALL_TRACE)) |
508 | goto out; | |
1da177e4 LT |
509 | |
510 | /* The 0x80 provides a way for the tracing parent to distinguish | |
511 | between a syscall stop and SIGTRAP delivery */ | |
512 | ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ? | |
513 | 0x80 : 0)); | |
514 | ||
515 | /* | |
516 | * this isn't the same as continuing with a signal, but it will do | |
517 | * for normal use. strace only continues with a signal if the | |
518 | * stopping signal is not SIGTRAP. -brl | |
519 | */ | |
520 | if (current->exit_code) { | |
521 | send_sig(current->exit_code, current, 1); | |
522 | current->exit_code = 0; | |
523 | } | |
2fd6f58b DW |
524 | out: |
525 | if (unlikely(current->audit_context) && !entryexit) | |
526 | audit_syscall_entry(current, audit_arch(), regs->regs[2], | |
527 | regs->regs[4], regs->regs[5], | |
528 | regs->regs[6], regs->regs[7]); | |
1da177e4 | 529 | } |