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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/smp.h>
24#include <linux/user.h>
25#include <linux/security.h>
26#include <linux/audit.h>
27#include <linux/seccomp.h>
28
29#include <asm/byteorder.h>
30#include <asm/cpu.h>
31#include <asm/dsp.h>
32#include <asm/fpu.h>
33#include <asm/mipsregs.h>
34#include <asm/mipsmtregs.h>
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>
40#include <asm/reg.h>
41
42
43
44
45
46
47void ptrace_disable(struct task_struct *child)
48{
49
50 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
51}
52
53
54
55
56
57
58int 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 = task_pt_regs(child);
67
68 for (i = 0; i < 32; i++)
69 __put_user((long)regs->regs[i], data + i);
70 __put_user((long)regs->lo, data + EF_LO - EF_R0);
71 __put_user((long)regs->hi, data + EF_HI - EF_R0);
72 __put_user((long)regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
73 __put_user((long)regs->cp0_badvaddr, data + EF_CP0_BADVADDR - EF_R0);
74 __put_user((long)regs->cp0_status, data + EF_CP0_STATUS - EF_R0);
75 __put_user((long)regs->cp0_cause, data + EF_CP0_CAUSE - EF_R0);
76
77 return 0;
78}
79
80
81
82
83
84
85int ptrace_setregs(struct task_struct *child, __s64 __user *data)
86{
87 struct pt_regs *regs;
88 int i;
89
90 if (!access_ok(VERIFY_READ, data, 38 * 8))
91 return -EIO;
92
93 regs = task_pt_regs(child);
94
95 for (i = 0; i < 32; i++)
96 __get_user(regs->regs[i], data + i);
97 __get_user(regs->lo, data + EF_LO - EF_R0);
98 __get_user(regs->hi, data + EF_HI - EF_R0);
99 __get_user(regs->cp0_epc, data + EF_CP0_EPC - EF_R0);
100
101
102
103 return 0;
104}
105
106int ptrace_getfpregs(struct task_struct *child, __u32 __user *data)
107{
108 int i;
109 unsigned int tmp;
110
111 if (!access_ok(VERIFY_WRITE, data, 33 * 8))
112 return -EIO;
113
114 if (tsk_used_math(child)) {
115 fpureg_t *fregs = get_fpu_regs(child);
116 for (i = 0; i < 32; i++)
117 __put_user(fregs[i], i + (__u64 __user *) data);
118 } else {
119 for (i = 0; i < 32; i++)
120 __put_user((__u64) -1, i + (__u64 __user *) data);
121 }
122
123 __put_user(child->thread.fpu.fcr31, data + 64);
124
125 preempt_disable();
126 if (cpu_has_fpu) {
127 unsigned int flags;
128
129 if (cpu_has_mipsmt) {
130 unsigned int vpflags = dvpe();
131 flags = read_c0_status();
132 __enable_fpu();
133 __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
134 write_c0_status(flags);
135 evpe(vpflags);
136 } else {
137 flags = read_c0_status();
138 __enable_fpu();
139 __asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
140 write_c0_status(flags);
141 }
142 } else {
143 tmp = 0;
144 }
145 preempt_enable();
146 __put_user(tmp, data + 65);
147
148 return 0;
149}
150
151int ptrace_setfpregs(struct task_struct *child, __u32 __user *data)
152{
153 fpureg_t *fregs;
154 int i;
155
156 if (!access_ok(VERIFY_READ, data, 33 * 8))
157 return -EIO;
158
159 fregs = get_fpu_regs(child);
160
161 for (i = 0; i < 32; i++)
162 __get_user(fregs[i], i + (__u64 __user *) data);
163
164 __get_user(child->thread.fpu.fcr31, data + 64);
165
166
167
168 return 0;
169}
170
171int ptrace_get_watch_regs(struct task_struct *child,
172 struct pt_watch_regs __user *addr)
173{
174 enum pt_watch_style style;
175 int i;
176
177 if (!cpu_has_watch || current_cpu_data.watch_reg_use_cnt == 0)
178 return -EIO;
179 if (!access_ok(VERIFY_WRITE, addr, sizeof(struct pt_watch_regs)))
180 return -EIO;
181
182#ifdef CONFIG_32BIT
183 style = pt_watch_style_mips32;
184#define WATCH_STYLE mips32
185#else
186 style = pt_watch_style_mips64;
187#define WATCH_STYLE mips64
188#endif
189
190 __put_user(style, &addr->style);
191 __put_user(current_cpu_data.watch_reg_use_cnt,
192 &addr->WATCH_STYLE.num_valid);
193 for (i = 0; i < current_cpu_data.watch_reg_use_cnt; i++) {
194 __put_user(child->thread.watch.mips3264.watchlo[i],
195 &addr->WATCH_STYLE.watchlo[i]);
196 __put_user(child->thread.watch.mips3264.watchhi[i] & 0xfff,
197 &addr->WATCH_STYLE.watchhi[i]);
198 __put_user(current_cpu_data.watch_reg_masks[i],
199 &addr->WATCH_STYLE.watch_masks[i]);
200 }
201 for (; i < 8; i++) {
202 __put_user(0, &addr->WATCH_STYLE.watchlo[i]);
203 __put_user(0, &addr->WATCH_STYLE.watchhi[i]);
204 __put_user(0, &addr->WATCH_STYLE.watch_masks[i]);
205 }
206
207 return 0;
208}
209
210int ptrace_set_watch_regs(struct task_struct *child,
211 struct pt_watch_regs __user *addr)
212{
213 int i;
214 int watch_active = 0;
215 unsigned long lt[NUM_WATCH_REGS];
216 u16 ht[NUM_WATCH_REGS];
217
218 if (!cpu_has_watch || current_cpu_data.watch_reg_use_cnt == 0)
219 return -EIO;
220 if (!access_ok(VERIFY_READ, addr, sizeof(struct pt_watch_regs)))
221 return -EIO;
222
223 for (i = 0; i < current_cpu_data.watch_reg_use_cnt; i++) {
224 __get_user(lt[i], &addr->WATCH_STYLE.watchlo[i]);
225#ifdef CONFIG_32BIT
226 if (lt[i] & __UA_LIMIT)
227 return -EINVAL;
228#else
229 if (test_tsk_thread_flag(child, TIF_32BIT_ADDR)) {
230 if (lt[i] & 0xffffffff80000000UL)
231 return -EINVAL;
232 } else {
233 if (lt[i] & __UA_LIMIT)
234 return -EINVAL;
235 }
236#endif
237 __get_user(ht[i], &addr->WATCH_STYLE.watchhi[i]);
238 if (ht[i] & ~0xff8)
239 return -EINVAL;
240 }
241
242 for (i = 0; i < current_cpu_data.watch_reg_use_cnt; i++) {
243 if (lt[i] & 7)
244 watch_active = 1;
245 child->thread.watch.mips3264.watchlo[i] = lt[i];
246
247 child->thread.watch.mips3264.watchhi[i] = ht[i];
248 }
249
250 if (watch_active)
251 set_tsk_thread_flag(child, TIF_LOAD_WATCH);
252 else
253 clear_tsk_thread_flag(child, TIF_LOAD_WATCH);
254
255 return 0;
256}
257
258long arch_ptrace(struct task_struct *child, long request, long addr, long data)
259{
260 int ret;
261
262 switch (request) {
263
264 case PTRACE_PEEKTEXT:
265 case PTRACE_PEEKDATA:
266 ret = generic_ptrace_peekdata(child, addr, data);
267 break;
268
269
270 case PTRACE_PEEKUSR: {
271 struct pt_regs *regs;
272 unsigned long tmp = 0;
273
274 regs = task_pt_regs(child);
275 ret = 0;
276
277 switch (addr) {
278 case 0 ... 31:
279 tmp = regs->regs[addr];
280 break;
281 case FPR_BASE ... FPR_BASE + 31:
282 if (tsk_used_math(child)) {
283 fpureg_t *fregs = get_fpu_regs(child);
284
285#ifdef CONFIG_32BIT
286
287
288
289
290
291 if (addr & 1)
292 tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32);
293 else
294 tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff);
295#endif
296#ifdef CONFIG_64BIT
297 tmp = fregs[addr - FPR_BASE];
298#endif
299 } else {
300 tmp = -1;
301 }
302 break;
303 case PC:
304 tmp = regs->cp0_epc;
305 break;
306 case CAUSE:
307 tmp = regs->cp0_cause;
308 break;
309 case BADVADDR:
310 tmp = regs->cp0_badvaddr;
311 break;
312 case MMHI:
313 tmp = regs->hi;
314 break;
315 case MMLO:
316 tmp = regs->lo;
317 break;
318#ifdef CONFIG_CPU_HAS_SMARTMIPS
319 case ACX:
320 tmp = regs->acx;
321 break;
322#endif
323 case FPC_CSR:
324 tmp = child->thread.fpu.fcr31;
325 break;
326 case FPC_EIR: {
327 unsigned int flags;
328#ifdef CONFIG_MIPS_MT_SMTC
329 unsigned long irqflags;
330 unsigned int mtflags;
331#endif
332
333 preempt_disable();
334 if (!cpu_has_fpu) {
335 preempt_enable();
336 break;
337 }
338
339#ifdef CONFIG_MIPS_MT_SMTC
340
341 local_irq_save(irqflags);
342 mtflags = dmt();
343#endif
344 if (cpu_has_mipsmt) {
345 unsigned int vpflags = dvpe();
346 flags = read_c0_status();
347 __enable_fpu();
348 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
349 write_c0_status(flags);
350 evpe(vpflags);
351 } else {
352 flags = read_c0_status();
353 __enable_fpu();
354 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
355 write_c0_status(flags);
356 }
357#ifdef CONFIG_MIPS_MT_SMTC
358 emt(mtflags);
359 local_irq_restore(irqflags);
360#endif
361 preempt_enable();
362 break;
363 }
364 case DSP_BASE ... DSP_BASE + 5: {
365 dspreg_t *dregs;
366
367 if (!cpu_has_dsp) {
368 tmp = 0;
369 ret = -EIO;
370 goto out;
371 }
372 dregs = __get_dsp_regs(child);
373 tmp = (unsigned long) (dregs[addr - DSP_BASE]);
374 break;
375 }
376 case DSP_CONTROL:
377 if (!cpu_has_dsp) {
378 tmp = 0;
379 ret = -EIO;
380 goto out;
381 }
382 tmp = child->thread.dsp.dspcontrol;
383 break;
384 default:
385 tmp = 0;
386 ret = -EIO;
387 goto out;
388 }
389 ret = put_user(tmp, (unsigned long __user *) data);
390 break;
391 }
392
393
394 case PTRACE_POKETEXT:
395 case PTRACE_POKEDATA:
396 ret = generic_ptrace_pokedata(child, addr, data);
397 break;
398
399 case PTRACE_POKEUSR: {
400 struct pt_regs *regs;
401 ret = 0;
402 regs = task_pt_regs(child);
403
404 switch (addr) {
405 case 0 ... 31:
406 regs->regs[addr] = data;
407 break;
408 case FPR_BASE ... FPR_BASE + 31: {
409 fpureg_t *fregs = get_fpu_regs(child);
410
411 if (!tsk_used_math(child)) {
412
413 memset(&child->thread.fpu, ~0,
414 sizeof(child->thread.fpu));
415 child->thread.fpu.fcr31 = 0;
416 }
417#ifdef CONFIG_32BIT
418
419
420
421
422
423 if (addr & 1) {
424 fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
425 fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32;
426 } else {
427 fregs[addr - FPR_BASE] &= ~0xffffffffLL;
428 fregs[addr - FPR_BASE] |= data;
429 }
430#endif
431#ifdef CONFIG_64BIT
432 fregs[addr - FPR_BASE] = data;
433#endif
434 break;
435 }
436 case PC:
437 regs->cp0_epc = data;
438 break;
439 case MMHI:
440 regs->hi = data;
441 break;
442 case MMLO:
443 regs->lo = data;
444 break;
445#ifdef CONFIG_CPU_HAS_SMARTMIPS
446 case ACX:
447 regs->acx = data;
448 break;
449#endif
450 case FPC_CSR:
451 child->thread.fpu.fcr31 = data;
452 break;
453 case DSP_BASE ... DSP_BASE + 5: {
454 dspreg_t *dregs;
455
456 if (!cpu_has_dsp) {
457 ret = -EIO;
458 break;
459 }
460
461 dregs = __get_dsp_regs(child);
462 dregs[addr - DSP_BASE] = data;
463 break;
464 }
465 case DSP_CONTROL:
466 if (!cpu_has_dsp) {
467 ret = -EIO;
468 break;
469 }
470 child->thread.dsp.dspcontrol = data;
471 break;
472 default:
473
474 ret = -EIO;
475 break;
476 }
477 break;
478 }
479
480 case PTRACE_GETREGS:
481 ret = ptrace_getregs(child, (__s64 __user *) data);
482 break;
483
484 case PTRACE_SETREGS:
485 ret = ptrace_setregs(child, (__s64 __user *) data);
486 break;
487
488 case PTRACE_GETFPREGS:
489 ret = ptrace_getfpregs(child, (__u32 __user *) data);
490 break;
491
492 case PTRACE_SETFPREGS:
493 ret = ptrace_setfpregs(child, (__u32 __user *) data);
494 break;
495
496 case PTRACE_SYSCALL:
497 case PTRACE_CONT: {
498 ret = -EIO;
499 if (!valid_signal(data))
500 break;
501 if (request == PTRACE_SYSCALL) {
502 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
503 }
504 else {
505 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
506 }
507 child->exit_code = data;
508 wake_up_process(child);
509 ret = 0;
510 break;
511 }
512
513
514
515
516
517
518 case PTRACE_KILL:
519 ret = 0;
520 if (child->exit_state == EXIT_ZOMBIE)
521 break;
522 child->exit_code = SIGKILL;
523 wake_up_process(child);
524 break;
525
526 case PTRACE_GET_THREAD_AREA:
527 ret = put_user(task_thread_info(child)->tp_value,
528 (unsigned long __user *) data);
529 break;
530
531 case PTRACE_GET_WATCH_REGS:
532 ret = ptrace_get_watch_regs(child,
533 (struct pt_watch_regs __user *) addr);
534 break;
535
536 case PTRACE_SET_WATCH_REGS:
537 ret = ptrace_set_watch_regs(child,
538 (struct pt_watch_regs __user *) addr);
539 break;
540
541 default:
542 ret = ptrace_request(child, request, addr, data);
543 break;
544 }
545 out:
546 return ret;
547}
548
549static inline int audit_arch(void)
550{
551 int arch = EM_MIPS;
552#ifdef CONFIG_64BIT
553 arch |= __AUDIT_ARCH_64BIT;
554#endif
555#if defined(__LITTLE_ENDIAN)
556 arch |= __AUDIT_ARCH_LE;
557#endif
558 return arch;
559}
560
561
562
563
564
565asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
566{
567
568 if (!entryexit)
569 secure_computing(regs->regs[0]);
570
571 if (unlikely(current->audit_context) && entryexit)
572 audit_syscall_exit(AUDITSC_RESULT(regs->regs[2]),
573 regs->regs[2]);
574
575 if (!(current->ptrace & PT_PTRACED))
576 goto out;
577
578 if (!test_thread_flag(TIF_SYSCALL_TRACE))
579 goto out;
580
581
582
583 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ?
584 0x80 : 0));
585
586
587
588
589
590
591 if (current->exit_code) {
592 send_sig(current->exit_code, current, 1);
593 current->exit_code = 0;
594 }
595
596out:
597 if (unlikely(current->audit_context) && !entryexit)
598 audit_syscall_entry(audit_arch(), regs->regs[0],
599 regs->regs[4], regs->regs[5],
600 regs->regs[6], regs->regs[7]);
601}
602