PTRACE_POKEDATA consolidation
[deliverable/linux.git] / arch / mips / kernel / ptrace.c
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/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>
25 #include <linux/user.h>
26 #include <linux/security.h>
27 #include <linux/signal.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 * 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
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
65 regs = task_pt_regs(child);
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
92 regs = task_pt_regs(child);
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;
108 unsigned int tmp;
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
122 __put_user (child->thread.fpu.fcr31, data + 64);
123
124 preempt_disable();
125 if (cpu_has_fpu) {
126 unsigned int flags;
127
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 }
141 } else {
142 tmp = 0;
143 }
144 preempt_enable();
145 __put_user (tmp, data + 65);
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
163 __get_user (child->thread.fpu.fcr31, data + 64);
164
165 /* FIR may not be written. */
166
167 return 0;
168 }
169
170 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
171 {
172 int ret;
173
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. */
177 case PTRACE_PEEKDATA:
178 ret = generic_ptrace_peekdata(child, addr, data);
179 break;
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
186 regs = task_pt_regs(child);
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
197 #ifdef CONFIG_32BIT
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
208 #ifdef CONFIG_64BIT
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;
230 #ifdef CONFIG_CPU_HAS_SMARTMIPS
231 case ACX:
232 tmp = regs->acx;
233 break;
234 #endif
235 case FPC_CSR:
236 tmp = child->thread.fpu.fcr31;
237 break;
238 case FPC_EIR: { /* implementation / version register */
239 unsigned int flags;
240 #ifdef CONFIG_MIPS_MT_SMTC
241 unsigned int irqflags;
242 unsigned int mtflags;
243 #endif /* CONFIG_MIPS_MT_SMTC */
244
245 preempt_disable();
246 if (!cpu_has_fpu) {
247 preempt_enable();
248 break;
249 }
250
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 */
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 }
269 #ifdef CONFIG_MIPS_MT_SMTC
270 emt(mtflags);
271 local_irq_restore(irqflags);
272 #endif /* CONFIG_MIPS_MT_SMTC */
273 preempt_enable();
274 break;
275 }
276 case DSP_BASE ... DSP_BASE + 5: {
277 dspreg_t *dregs;
278
279 if (!cpu_has_dsp) {
280 tmp = 0;
281 ret = -EIO;
282 goto out;
283 }
284 dregs = __get_dsp_regs(child);
285 tmp = (unsigned long) (dregs[addr - DSP_BASE]);
286 break;
287 }
288 case DSP_CONTROL:
289 if (!cpu_has_dsp) {
290 tmp = 0;
291 ret = -EIO;
292 goto out;
293 }
294 tmp = child->thread.dsp.dspcontrol;
295 break;
296 default:
297 tmp = 0;
298 ret = -EIO;
299 goto out;
300 }
301 ret = put_user(tmp, (unsigned long __user *) data);
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 = generic_ptrace_pokedata(child, addr, data);
309 break;
310
311 case PTRACE_POKEUSR: {
312 struct pt_regs *regs;
313 ret = 0;
314 regs = task_pt_regs(child);
315
316 switch (addr) {
317 case 0 ... 31:
318 regs->regs[addr] = data;
319 break;
320 case FPR_BASE ... FPR_BASE + 31: {
321 fpureg_t *fregs = get_fpu_regs(child);
322
323 if (!tsk_used_math(child)) {
324 /* FP not yet used */
325 memset(&child->thread.fpu, ~0,
326 sizeof(child->thread.fpu));
327 child->thread.fpu.fcr31 = 0;
328 }
329 #ifdef CONFIG_32BIT
330 /*
331 * The odd registers are actually the high order bits
332 * of the values stored in the even registers - unless
333 * we're using r2k_switch.S.
334 */
335 if (addr & 1) {
336 fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
337 fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32;
338 } else {
339 fregs[addr - FPR_BASE] &= ~0xffffffffLL;
340 fregs[addr - FPR_BASE] |= data;
341 }
342 #endif
343 #ifdef CONFIG_64BIT
344 fregs[addr - FPR_BASE] = data;
345 #endif
346 break;
347 }
348 case PC:
349 regs->cp0_epc = data;
350 break;
351 case MMHI:
352 regs->hi = data;
353 break;
354 case MMLO:
355 regs->lo = data;
356 break;
357 #ifdef CONFIG_CPU_HAS_SMARTMIPS
358 case ACX:
359 regs->acx = data;
360 break;
361 #endif
362 case FPC_CSR:
363 child->thread.fpu.fcr31 = data;
364 break;
365 case DSP_BASE ... DSP_BASE + 5: {
366 dspreg_t *dregs;
367
368 if (!cpu_has_dsp) {
369 ret = -EIO;
370 break;
371 }
372
373 dregs = __get_dsp_regs(child);
374 dregs[addr - DSP_BASE] = data;
375 break;
376 }
377 case DSP_CONTROL:
378 if (!cpu_has_dsp) {
379 ret = -EIO;
380 break;
381 }
382 child->thread.dsp.dspcontrol = data;
383 break;
384 default:
385 /* The rest are not allowed. */
386 ret = -EIO;
387 break;
388 }
389 break;
390 }
391
392 case PTRACE_GETREGS:
393 ret = ptrace_getregs (child, (__u64 __user *) data);
394 break;
395
396 case PTRACE_SETREGS:
397 ret = ptrace_setregs (child, (__u64 __user *) data);
398 break;
399
400 case PTRACE_GETFPREGS:
401 ret = ptrace_getfpregs (child, (__u32 __user *) data);
402 break;
403
404 case PTRACE_SETFPREGS:
405 ret = ptrace_setfpregs (child, (__u32 __user *) data);
406 break;
407
408 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
409 case PTRACE_CONT: { /* restart after signal. */
410 ret = -EIO;
411 if (!valid_signal(data))
412 break;
413 if (request == PTRACE_SYSCALL) {
414 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
415 }
416 else {
417 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
418 }
419 child->exit_code = data;
420 wake_up_process(child);
421 ret = 0;
422 break;
423 }
424
425 /*
426 * make the child exit. Best I can do is send it a sigkill.
427 * perhaps it should be put in the status that it wants to
428 * exit.
429 */
430 case PTRACE_KILL:
431 ret = 0;
432 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
433 break;
434 child->exit_code = SIGKILL;
435 wake_up_process(child);
436 break;
437
438 case PTRACE_DETACH: /* detach a process that was attached. */
439 ret = ptrace_detach(child, data);
440 break;
441
442 case PTRACE_GET_THREAD_AREA:
443 ret = put_user(task_thread_info(child)->tp_value,
444 (unsigned long __user *) data);
445 break;
446
447 default:
448 ret = ptrace_request(child, request, addr, data);
449 break;
450 }
451 out:
452 return ret;
453 }
454
455 static inline int audit_arch(void)
456 {
457 int arch = EM_MIPS;
458 #ifdef CONFIG_64BIT
459 arch |= __AUDIT_ARCH_64BIT;
460 #endif
461 #if defined(__LITTLE_ENDIAN)
462 arch |= __AUDIT_ARCH_LE;
463 #endif
464 return arch;
465 }
466
467 /*
468 * Notification of system call entry/exit
469 * - triggered by current->work.syscall_trace
470 */
471 asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
472 {
473 if (unlikely(current->audit_context) && entryexit)
474 audit_syscall_exit(AUDITSC_RESULT(regs->regs[2]),
475 regs->regs[2]);
476
477 if (!(current->ptrace & PT_PTRACED))
478 goto out;
479 if (!test_thread_flag(TIF_SYSCALL_TRACE))
480 goto out;
481
482 /* The 0x80 provides a way for the tracing parent to distinguish
483 between a syscall stop and SIGTRAP delivery */
484 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ?
485 0x80 : 0));
486
487 /*
488 * this isn't the same as continuing with a signal, but it will do
489 * for normal use. strace only continues with a signal if the
490 * stopping signal is not SIGTRAP. -brl
491 */
492 if (current->exit_code) {
493 send_sig(current->exit_code, current, 1);
494 current->exit_code = 0;
495 }
496 out:
497 if (unlikely(current->audit_context) && !entryexit)
498 audit_syscall_entry(audit_arch(), regs->regs[2],
499 regs->regs[4], regs->regs[5],
500 regs->regs[6], regs->regs[7]);
501 }
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