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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 | */ | |
1da177e4 LT |
17 | #include <linux/compiler.h> |
18 | #include <linux/kernel.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/ptrace.h> | |
23 | #include <linux/audit.h> | |
24 | #include <linux/smp.h> | |
1da177e4 LT |
25 | #include <linux/user.h> |
26 | #include <linux/security.h> | |
7ed20e1a | 27 | #include <linux/signal.h> |
1da177e4 | 28 | |
f8280c8d | 29 | #include <asm/byteorder.h> |
1da177e4 | 30 | #include <asm/cpu.h> |
e50c0a8f | 31 | #include <asm/dsp.h> |
1da177e4 LT |
32 | #include <asm/fpu.h> |
33 | #include <asm/mipsregs.h> | |
101b3531 | 34 | #include <asm/mipsmtregs.h> |
1da177e4 LT |
35 | #include <asm/pgtable.h> |
36 | #include <asm/page.h> | |
37 | #include <asm/system.h> | |
38 | #include <asm/uaccess.h> | |
39 | #include <asm/bootinfo.h> | |
ea3d710f | 40 | #include <asm/reg.h> |
1da177e4 LT |
41 | |
42 | /* | |
43 | * Called by kernel/ptrace.c when detaching.. | |
44 | * | |
45 | * Make sure single step bits etc are not set. | |
46 | */ | |
47 | void ptrace_disable(struct task_struct *child) | |
48 | { | |
49 | /* Nothing to do.. */ | |
50 | } | |
51 | ||
ea3d710f DJ |
52 | /* |
53 | * Read a general register set. We always use the 64-bit format, even | |
54 | * for 32-bit kernels and for 32-bit processes on a 64-bit kernel. | |
55 | * Registers are sign extended to fill the available space. | |
56 | */ | |
57 | int ptrace_getregs (struct task_struct *child, __s64 __user *data) | |
58 | { | |
59 | struct pt_regs *regs; | |
60 | int i; | |
61 | ||
62 | if (!access_ok(VERIFY_WRITE, data, 38 * 8)) | |
63 | return -EIO; | |
64 | ||
40bc9c67 | 65 | regs = task_pt_regs(child); |
ea3d710f DJ |
66 | |
67 | for (i = 0; i < 32; i++) | |
68 | __put_user (regs->regs[i], data + i); | |
69 | __put_user (regs->lo, data + EF_LO - EF_R0); | |
70 | __put_user (regs->hi, data + EF_HI - EF_R0); | |
71 | __put_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0); | |
72 | __put_user (regs->cp0_badvaddr, data + EF_CP0_BADVADDR - EF_R0); | |
73 | __put_user (regs->cp0_status, data + EF_CP0_STATUS - EF_R0); | |
74 | __put_user (regs->cp0_cause, data + EF_CP0_CAUSE - EF_R0); | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | /* | |
80 | * Write a general register set. As for PTRACE_GETREGS, we always use | |
81 | * the 64-bit format. On a 32-bit kernel only the lower order half | |
82 | * (according to endianness) will be used. | |
83 | */ | |
84 | int ptrace_setregs (struct task_struct *child, __s64 __user *data) | |
85 | { | |
86 | struct pt_regs *regs; | |
87 | int i; | |
88 | ||
89 | if (!access_ok(VERIFY_READ, data, 38 * 8)) | |
90 | return -EIO; | |
91 | ||
40bc9c67 | 92 | regs = task_pt_regs(child); |
ea3d710f DJ |
93 | |
94 | for (i = 0; i < 32; i++) | |
95 | __get_user (regs->regs[i], data + i); | |
96 | __get_user (regs->lo, data + EF_LO - EF_R0); | |
97 | __get_user (regs->hi, data + EF_HI - EF_R0); | |
98 | __get_user (regs->cp0_epc, data + EF_CP0_EPC - EF_R0); | |
99 | ||
100 | /* badvaddr, status, and cause may not be written. */ | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | int ptrace_getfpregs (struct task_struct *child, __u32 __user *data) | |
106 | { | |
107 | int i; | |
e04582b7 | 108 | unsigned int tmp; |
ea3d710f DJ |
109 | |
110 | if (!access_ok(VERIFY_WRITE, data, 33 * 8)) | |
111 | return -EIO; | |
112 | ||
113 | if (tsk_used_math(child)) { | |
114 | fpureg_t *fregs = get_fpu_regs(child); | |
115 | for (i = 0; i < 32; i++) | |
116 | __put_user (fregs[i], i + (__u64 __user *) data); | |
117 | } else { | |
118 | for (i = 0; i < 32; i++) | |
119 | __put_user ((__u64) -1, i + (__u64 __user *) data); | |
120 | } | |
121 | ||
eae89076 AN |
122 | __put_user (child->thread.fpu.fcr31, data + 64); |
123 | ||
e04582b7 | 124 | preempt_disable(); |
ea3d710f | 125 | if (cpu_has_fpu) { |
e04582b7 | 126 | unsigned int flags; |
ea3d710f | 127 | |
101b3531 RB |
128 | if (cpu_has_mipsmt) { |
129 | unsigned int vpflags = dvpe(); | |
130 | flags = read_c0_status(); | |
131 | __enable_fpu(); | |
132 | __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp)); | |
133 | write_c0_status(flags); | |
134 | evpe(vpflags); | |
135 | } else { | |
136 | flags = read_c0_status(); | |
137 | __enable_fpu(); | |
138 | __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp)); | |
139 | write_c0_status(flags); | |
140 | } | |
ea3d710f | 141 | } else { |
e04582b7 | 142 | tmp = 0; |
ea3d710f | 143 | } |
e04582b7 AN |
144 | preempt_enable(); |
145 | __put_user (tmp, data + 65); | |
ea3d710f DJ |
146 | |
147 | return 0; | |
148 | } | |
149 | ||
150 | int ptrace_setfpregs (struct task_struct *child, __u32 __user *data) | |
151 | { | |
152 | fpureg_t *fregs; | |
153 | int i; | |
154 | ||
155 | if (!access_ok(VERIFY_READ, data, 33 * 8)) | |
156 | return -EIO; | |
157 | ||
158 | fregs = get_fpu_regs(child); | |
159 | ||
160 | for (i = 0; i < 32; i++) | |
161 | __get_user (fregs[i], i + (__u64 __user *) data); | |
162 | ||
eae89076 | 163 | __get_user (child->thread.fpu.fcr31, data + 64); |
ea3d710f DJ |
164 | |
165 | /* FIR may not be written. */ | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
481bed45 | 170 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 171 | { |
1da177e4 LT |
172 | int ret; |
173 | ||
1da177e4 LT |
174 | switch (request) { |
175 | /* when I and D space are separate, these will need to be fixed. */ | |
176 | case PTRACE_PEEKTEXT: /* read word at location addr. */ | |
76647323 AD |
177 | case PTRACE_PEEKDATA: |
178 | ret = generic_ptrace_peekdata(child, addr, data); | |
1da177e4 | 179 | break; |
1da177e4 LT |
180 | |
181 | /* Read the word at location addr in the USER area. */ | |
182 | case PTRACE_PEEKUSR: { | |
183 | struct pt_regs *regs; | |
184 | unsigned long tmp = 0; | |
185 | ||
40bc9c67 | 186 | regs = task_pt_regs(child); |
1da177e4 LT |
187 | ret = 0; /* Default return value. */ |
188 | ||
189 | switch (addr) { | |
190 | case 0 ... 31: | |
191 | tmp = regs->regs[addr]; | |
192 | break; | |
193 | case FPR_BASE ... FPR_BASE + 31: | |
194 | if (tsk_used_math(child)) { | |
195 | fpureg_t *fregs = get_fpu_regs(child); | |
196 | ||
875d43e7 | 197 | #ifdef CONFIG_32BIT |
1da177e4 LT |
198 | /* |
199 | * The odd registers are actually the high | |
200 | * order bits of the values stored in the even | |
201 | * registers - unless we're using r2k_switch.S. | |
202 | */ | |
203 | if (addr & 1) | |
204 | tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32); | |
205 | else | |
206 | tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff); | |
207 | #endif | |
875d43e7 | 208 | #ifdef CONFIG_64BIT |
1da177e4 LT |
209 | tmp = fregs[addr - FPR_BASE]; |
210 | #endif | |
211 | } else { | |
212 | tmp = -1; /* FP not yet used */ | |
213 | } | |
214 | break; | |
215 | case PC: | |
216 | tmp = regs->cp0_epc; | |
217 | break; | |
218 | case CAUSE: | |
219 | tmp = regs->cp0_cause; | |
220 | break; | |
221 | case BADVADDR: | |
222 | tmp = regs->cp0_badvaddr; | |
223 | break; | |
224 | case MMHI: | |
225 | tmp = regs->hi; | |
226 | break; | |
227 | case MMLO: | |
228 | tmp = regs->lo; | |
229 | break; | |
9693a853 FBH |
230 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
231 | case ACX: | |
232 | tmp = regs->acx; | |
233 | break; | |
234 | #endif | |
1da177e4 | 235 | case FPC_CSR: |
eae89076 | 236 | tmp = child->thread.fpu.fcr31; |
1da177e4 LT |
237 | break; |
238 | case FPC_EIR: { /* implementation / version register */ | |
239 | unsigned int flags; | |
41c594ab RB |
240 | #ifdef CONFIG_MIPS_MT_SMTC |
241 | unsigned int irqflags; | |
242 | unsigned int mtflags; | |
243 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
1da177e4 | 244 | |
e04582b7 AN |
245 | preempt_disable(); |
246 | if (!cpu_has_fpu) { | |
247 | preempt_enable(); | |
1da177e4 | 248 | break; |
e04582b7 | 249 | } |
1da177e4 | 250 | |
41c594ab RB |
251 | #ifdef CONFIG_MIPS_MT_SMTC |
252 | /* Read-modify-write of Status must be atomic */ | |
253 | local_irq_save(irqflags); | |
254 | mtflags = dmt(); | |
255 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
101b3531 RB |
256 | if (cpu_has_mipsmt) { |
257 | unsigned int vpflags = dvpe(); | |
258 | flags = read_c0_status(); | |
259 | __enable_fpu(); | |
260 | __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp)); | |
261 | write_c0_status(flags); | |
262 | evpe(vpflags); | |
263 | } else { | |
264 | flags = read_c0_status(); | |
265 | __enable_fpu(); | |
266 | __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp)); | |
267 | write_c0_status(flags); | |
268 | } | |
41c594ab RB |
269 | #ifdef CONFIG_MIPS_MT_SMTC |
270 | emt(mtflags); | |
271 | local_irq_restore(irqflags); | |
272 | #endif /* CONFIG_MIPS_MT_SMTC */ | |
101b3531 | 273 | preempt_enable(); |
1da177e4 LT |
274 | break; |
275 | } | |
c134a5ec RB |
276 | case DSP_BASE ... DSP_BASE + 5: { |
277 | dspreg_t *dregs; | |
278 | ||
e50c0a8f RB |
279 | if (!cpu_has_dsp) { |
280 | tmp = 0; | |
281 | ret = -EIO; | |
481bed45 | 282 | goto out; |
e50c0a8f | 283 | } |
6c355852 RB |
284 | dregs = __get_dsp_regs(child); |
285 | tmp = (unsigned long) (dregs[addr - DSP_BASE]); | |
e50c0a8f | 286 | break; |
c134a5ec | 287 | } |
e50c0a8f RB |
288 | case DSP_CONTROL: |
289 | if (!cpu_has_dsp) { | |
290 | tmp = 0; | |
291 | ret = -EIO; | |
481bed45 | 292 | goto out; |
e50c0a8f RB |
293 | } |
294 | tmp = child->thread.dsp.dspcontrol; | |
295 | break; | |
1da177e4 LT |
296 | default: |
297 | tmp = 0; | |
298 | ret = -EIO; | |
481bed45 | 299 | goto out; |
1da177e4 | 300 | } |
fe00f943 | 301 | ret = put_user(tmp, (unsigned long __user *) data); |
1da177e4 LT |
302 | break; |
303 | } | |
304 | ||
305 | /* when I and D space are separate, this will have to be fixed. */ | |
306 | case PTRACE_POKETEXT: /* write the word at location addr. */ | |
307 | case PTRACE_POKEDATA: | |
308 | ret = 0; | |
309 | if (access_process_vm(child, addr, &data, sizeof(data), 1) | |
310 | == sizeof(data)) | |
311 | break; | |
312 | ret = -EIO; | |
313 | break; | |
314 | ||
315 | case PTRACE_POKEUSR: { | |
316 | struct pt_regs *regs; | |
317 | ret = 0; | |
40bc9c67 | 318 | regs = task_pt_regs(child); |
1da177e4 LT |
319 | |
320 | switch (addr) { | |
321 | case 0 ... 31: | |
322 | regs->regs[addr] = data; | |
323 | break; | |
324 | case FPR_BASE ... FPR_BASE + 31: { | |
325 | fpureg_t *fregs = get_fpu_regs(child); | |
326 | ||
327 | if (!tsk_used_math(child)) { | |
328 | /* FP not yet used */ | |
eae89076 AN |
329 | memset(&child->thread.fpu, ~0, |
330 | sizeof(child->thread.fpu)); | |
331 | child->thread.fpu.fcr31 = 0; | |
1da177e4 | 332 | } |
875d43e7 | 333 | #ifdef CONFIG_32BIT |
1da177e4 LT |
334 | /* |
335 | * The odd registers are actually the high order bits | |
336 | * of the values stored in the even registers - unless | |
337 | * we're using r2k_switch.S. | |
338 | */ | |
339 | if (addr & 1) { | |
340 | fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff; | |
341 | fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32; | |
342 | } else { | |
343 | fregs[addr - FPR_BASE] &= ~0xffffffffLL; | |
344 | fregs[addr - FPR_BASE] |= data; | |
345 | } | |
346 | #endif | |
875d43e7 | 347 | #ifdef CONFIG_64BIT |
1da177e4 LT |
348 | fregs[addr - FPR_BASE] = data; |
349 | #endif | |
350 | break; | |
351 | } | |
352 | case PC: | |
353 | regs->cp0_epc = data; | |
354 | break; | |
355 | case MMHI: | |
356 | regs->hi = data; | |
357 | break; | |
358 | case MMLO: | |
359 | regs->lo = data; | |
360 | break; | |
9693a853 FBH |
361 | #ifdef CONFIG_CPU_HAS_SMARTMIPS |
362 | case ACX: | |
363 | regs->acx = data; | |
364 | break; | |
365 | #endif | |
1da177e4 | 366 | case FPC_CSR: |
eae89076 | 367 | child->thread.fpu.fcr31 = data; |
1da177e4 | 368 | break; |
c134a5ec RB |
369 | case DSP_BASE ... DSP_BASE + 5: { |
370 | dspreg_t *dregs; | |
371 | ||
e50c0a8f RB |
372 | if (!cpu_has_dsp) { |
373 | ret = -EIO; | |
374 | break; | |
375 | } | |
376 | ||
c134a5ec | 377 | dregs = __get_dsp_regs(child); |
e50c0a8f RB |
378 | dregs[addr - DSP_BASE] = data; |
379 | break; | |
c134a5ec | 380 | } |
e50c0a8f RB |
381 | case DSP_CONTROL: |
382 | if (!cpu_has_dsp) { | |
383 | ret = -EIO; | |
384 | break; | |
385 | } | |
386 | child->thread.dsp.dspcontrol = data; | |
387 | break; | |
1da177e4 LT |
388 | default: |
389 | /* The rest are not allowed. */ | |
390 | ret = -EIO; | |
391 | break; | |
392 | } | |
393 | break; | |
394 | } | |
395 | ||
ea3d710f DJ |
396 | case PTRACE_GETREGS: |
397 | ret = ptrace_getregs (child, (__u64 __user *) data); | |
398 | break; | |
399 | ||
400 | case PTRACE_SETREGS: | |
401 | ret = ptrace_setregs (child, (__u64 __user *) data); | |
402 | break; | |
403 | ||
404 | case PTRACE_GETFPREGS: | |
405 | ret = ptrace_getfpregs (child, (__u32 __user *) data); | |
406 | break; | |
407 | ||
408 | case PTRACE_SETFPREGS: | |
409 | ret = ptrace_setfpregs (child, (__u32 __user *) data); | |
410 | break; | |
411 | ||
1da177e4 LT |
412 | case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ |
413 | case PTRACE_CONT: { /* restart after signal. */ | |
414 | ret = -EIO; | |
7ed20e1a | 415 | if (!valid_signal(data)) |
1da177e4 LT |
416 | break; |
417 | if (request == PTRACE_SYSCALL) { | |
418 | set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
419 | } | |
420 | else { | |
421 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
422 | } | |
423 | child->exit_code = data; | |
424 | wake_up_process(child); | |
425 | ret = 0; | |
426 | break; | |
427 | } | |
428 | ||
429 | /* | |
430 | * make the child exit. Best I can do is send it a sigkill. | |
431 | * perhaps it should be put in the status that it wants to | |
432 | * exit. | |
433 | */ | |
434 | case PTRACE_KILL: | |
435 | ret = 0; | |
436 | if (child->exit_state == EXIT_ZOMBIE) /* already dead */ | |
437 | break; | |
438 | child->exit_code = SIGKILL; | |
439 | wake_up_process(child); | |
440 | break; | |
441 | ||
442 | case PTRACE_DETACH: /* detach a process that was attached. */ | |
443 | ret = ptrace_detach(child, data); | |
444 | break; | |
445 | ||
3c37026d | 446 | case PTRACE_GET_THREAD_AREA: |
dc8f6029 | 447 | ret = put_user(task_thread_info(child)->tp_value, |
3c37026d RB |
448 | (unsigned long __user *) data); |
449 | break; | |
450 | ||
1da177e4 LT |
451 | default: |
452 | ret = ptrace_request(child, request, addr, data); | |
453 | break; | |
454 | } | |
481bed45 | 455 | out: |
1da177e4 LT |
456 | return ret; |
457 | } | |
458 | ||
67eb81e1 | 459 | static inline int audit_arch(void) |
2fd6f58b | 460 | { |
f8280c8d | 461 | int arch = EM_MIPS; |
875d43e7 | 462 | #ifdef CONFIG_64BIT |
f8280c8d RB |
463 | arch |= __AUDIT_ARCH_64BIT; |
464 | #endif | |
465 | #if defined(__LITTLE_ENDIAN) | |
466 | arch |= __AUDIT_ARCH_LE; | |
467 | #endif | |
468 | return arch; | |
2fd6f58b | 469 | } |
470 | ||
1da177e4 LT |
471 | /* |
472 | * Notification of system call entry/exit | |
473 | * - triggered by current->work.syscall_trace | |
474 | */ | |
475 | asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit) | |
476 | { | |
2fd6f58b | 477 | if (unlikely(current->audit_context) && entryexit) |
5411be59 | 478 | audit_syscall_exit(AUDITSC_RESULT(regs->regs[2]), |
f8280c8d | 479 | regs->regs[2]); |
1da177e4 | 480 | |
1da177e4 | 481 | if (!(current->ptrace & PT_PTRACED)) |
2fd6f58b | 482 | goto out; |
f8280c8d RB |
483 | if (!test_thread_flag(TIF_SYSCALL_TRACE)) |
484 | goto out; | |
1da177e4 LT |
485 | |
486 | /* The 0x80 provides a way for the tracing parent to distinguish | |
487 | between a syscall stop and SIGTRAP delivery */ | |
488 | ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ? | |
489 | 0x80 : 0)); | |
490 | ||
491 | /* | |
492 | * this isn't the same as continuing with a signal, but it will do | |
493 | * for normal use. strace only continues with a signal if the | |
494 | * stopping signal is not SIGTRAP. -brl | |
495 | */ | |
496 | if (current->exit_code) { | |
497 | send_sig(current->exit_code, current, 1); | |
498 | current->exit_code = 0; | |
499 | } | |
2fd6f58b | 500 | out: |
501 | if (unlikely(current->audit_context) && !entryexit) | |
5411be59 | 502 | audit_syscall_entry(audit_arch(), regs->regs[2], |
2fd6f58b | 503 | regs->regs[4], regs->regs[5], |
504 | regs->regs[6], regs->regs[7]); | |
1da177e4 | 505 | } |