Commit | Line | Data |
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1da177e4 LT |
1 | /* ptrace.c: Sparc process tracing support. |
2 | * | |
8e3fe806 | 3 | * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
4 | * |
5 | * Based upon code written by Ross Biro, Linus Torvalds, Bob Manson, | |
6 | * and David Mosberger. | |
7 | * | |
5b2afff2 | 8 | * Added Linux support -miguel (weird, eh?, the original code was meant |
1da177e4 LT |
9 | * to emulate SunOS). |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/mm.h> | |
15 | #include <linux/errno.h> | |
16 | #include <linux/ptrace.h> | |
17 | #include <linux/user.h> | |
18 | #include <linux/smp.h> | |
19 | #include <linux/smp_lock.h> | |
20 | #include <linux/security.h> | |
7ed20e1a | 21 | #include <linux/signal.h> |
8e3fe806 DM |
22 | #include <linux/regset.h> |
23 | #include <linux/elf.h> | |
1c133b4b | 24 | #include <linux/tracehook.h> |
1da177e4 LT |
25 | |
26 | #include <asm/pgtable.h> | |
27 | #include <asm/system.h> | |
28 | #include <asm/uaccess.h> | |
29 | ||
1da177e4 | 30 | /* #define ALLOW_INIT_TRACING */ |
1da177e4 LT |
31 | |
32 | /* | |
33 | * Called by kernel/ptrace.c when detaching.. | |
34 | * | |
35 | * Make sure single step bits etc are not set. | |
36 | */ | |
37 | void ptrace_disable(struct task_struct *child) | |
38 | { | |
39 | /* nothing to do */ | |
40 | } | |
41 | ||
8e3fe806 DM |
42 | enum sparc_regset { |
43 | REGSET_GENERAL, | |
44 | REGSET_FP, | |
45 | }; | |
46 | ||
47 | static int genregs32_get(struct task_struct *target, | |
48 | const struct user_regset *regset, | |
49 | unsigned int pos, unsigned int count, | |
50 | void *kbuf, void __user *ubuf) | |
51 | { | |
52 | const struct pt_regs *regs = target->thread.kregs; | |
53 | unsigned long __user *reg_window; | |
54 | unsigned long *k = kbuf; | |
55 | unsigned long __user *u = ubuf; | |
56 | unsigned long reg; | |
57 | ||
58 | if (target == current) | |
59 | flush_user_windows(); | |
60 | ||
61 | pos /= sizeof(reg); | |
62 | count /= sizeof(reg); | |
63 | ||
64 | if (kbuf) { | |
65 | for (; count > 0 && pos < 16; count--) | |
66 | *k++ = regs->u_regs[pos++]; | |
67 | ||
68 | reg_window = (unsigned long __user *) regs->u_regs[UREG_I6]; | |
69 | for (; count > 0 && pos < 32; count--) { | |
70 | if (get_user(*k++, ®_window[pos++])) | |
71 | return -EFAULT; | |
72 | } | |
73 | } else { | |
74 | for (; count > 0 && pos < 16; count--) { | |
75 | if (put_user(regs->u_regs[pos++], u++)) | |
76 | return -EFAULT; | |
77 | } | |
78 | ||
79 | reg_window = (unsigned long __user *) regs->u_regs[UREG_I6]; | |
80 | for (; count > 0 && pos < 32; count--) { | |
81 | if (get_user(reg, ®_window[pos++]) || | |
82 | put_user(reg, u++)) | |
83 | return -EFAULT; | |
84 | } | |
85 | } | |
86 | while (count > 0) { | |
87 | switch (pos) { | |
88 | case 32: /* PSR */ | |
89 | reg = regs->psr; | |
90 | break; | |
91 | case 33: /* PC */ | |
92 | reg = regs->pc; | |
93 | break; | |
94 | case 34: /* NPC */ | |
95 | reg = regs->npc; | |
96 | break; | |
97 | case 35: /* Y */ | |
98 | reg = regs->y; | |
99 | break; | |
100 | case 36: /* WIM */ | |
101 | case 37: /* TBR */ | |
102 | reg = 0; | |
103 | break; | |
104 | default: | |
105 | goto finish; | |
106 | } | |
107 | ||
108 | if (kbuf) | |
109 | *k++ = reg; | |
110 | else if (put_user(reg, u++)) | |
111 | return -EFAULT; | |
112 | pos++; | |
113 | count--; | |
114 | } | |
115 | finish: | |
116 | pos *= sizeof(reg); | |
117 | count *= sizeof(reg); | |
118 | ||
119 | return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, | |
120 | 38 * sizeof(reg), -1); | |
121 | } | |
122 | ||
123 | static int genregs32_set(struct task_struct *target, | |
124 | const struct user_regset *regset, | |
125 | unsigned int pos, unsigned int count, | |
126 | const void *kbuf, const void __user *ubuf) | |
127 | { | |
128 | struct pt_regs *regs = target->thread.kregs; | |
129 | unsigned long __user *reg_window; | |
130 | const unsigned long *k = kbuf; | |
131 | const unsigned long __user *u = ubuf; | |
132 | unsigned long reg; | |
133 | ||
134 | if (target == current) | |
135 | flush_user_windows(); | |
136 | ||
137 | pos /= sizeof(reg); | |
138 | count /= sizeof(reg); | |
139 | ||
140 | if (kbuf) { | |
141 | for (; count > 0 && pos < 16; count--) | |
142 | regs->u_regs[pos++] = *k++; | |
143 | ||
144 | reg_window = (unsigned long __user *) regs->u_regs[UREG_I6]; | |
145 | for (; count > 0 && pos < 32; count--) { | |
146 | if (put_user(*k++, ®_window[pos++])) | |
147 | return -EFAULT; | |
148 | } | |
149 | } else { | |
150 | for (; count > 0 && pos < 16; count--) { | |
151 | if (get_user(reg, u++)) | |
152 | return -EFAULT; | |
153 | regs->u_regs[pos++] = reg; | |
154 | } | |
155 | ||
156 | reg_window = (unsigned long __user *) regs->u_regs[UREG_I6]; | |
157 | for (; count > 0 && pos < 32; count--) { | |
158 | if (get_user(reg, u++) || | |
159 | put_user(reg, ®_window[pos++])) | |
160 | return -EFAULT; | |
161 | } | |
162 | } | |
163 | while (count > 0) { | |
164 | unsigned long psr; | |
165 | ||
166 | if (kbuf) | |
167 | reg = *k++; | |
168 | else if (get_user(reg, u++)) | |
169 | return -EFAULT; | |
170 | ||
171 | switch (pos) { | |
172 | case 32: /* PSR */ | |
173 | psr = regs->psr; | |
28e61036 DM |
174 | psr &= ~(PSR_ICC | PSR_SYSCALL); |
175 | psr |= (reg & (PSR_ICC | PSR_SYSCALL)); | |
8e3fe806 DM |
176 | regs->psr = psr; |
177 | break; | |
178 | case 33: /* PC */ | |
179 | regs->pc = reg; | |
180 | break; | |
181 | case 34: /* NPC */ | |
182 | regs->npc = reg; | |
183 | break; | |
184 | case 35: /* Y */ | |
185 | regs->y = reg; | |
186 | break; | |
187 | case 36: /* WIM */ | |
188 | case 37: /* TBR */ | |
189 | break; | |
190 | default: | |
191 | goto finish; | |
192 | } | |
193 | ||
194 | pos++; | |
195 | count--; | |
196 | } | |
197 | finish: | |
198 | pos *= sizeof(reg); | |
199 | count *= sizeof(reg); | |
200 | ||
201 | return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, | |
202 | 38 * sizeof(reg), -1); | |
203 | } | |
204 | ||
205 | static int fpregs32_get(struct task_struct *target, | |
206 | const struct user_regset *regset, | |
207 | unsigned int pos, unsigned int count, | |
208 | void *kbuf, void __user *ubuf) | |
209 | { | |
210 | const unsigned long *fpregs = target->thread.float_regs; | |
211 | int ret = 0; | |
212 | ||
213 | #if 0 | |
214 | if (target == current) | |
215 | save_and_clear_fpu(); | |
216 | #endif | |
217 | ||
218 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
219 | fpregs, | |
220 | 0, 32 * sizeof(u32)); | |
221 | ||
222 | if (!ret) | |
223 | ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, | |
224 | 32 * sizeof(u32), | |
225 | 33 * sizeof(u32)); | |
226 | if (!ret) | |
227 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
228 | &target->thread.fsr, | |
229 | 33 * sizeof(u32), | |
230 | 34 * sizeof(u32)); | |
231 | ||
232 | if (!ret) { | |
233 | unsigned long val; | |
234 | ||
235 | val = (1 << 8) | (8 << 16); | |
236 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, | |
237 | &val, | |
238 | 34 * sizeof(u32), | |
239 | 35 * sizeof(u32)); | |
240 | } | |
241 | ||
242 | if (!ret) | |
243 | ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, | |
244 | 35 * sizeof(u32), -1); | |
245 | ||
246 | return ret; | |
247 | } | |
248 | ||
249 | static int fpregs32_set(struct task_struct *target, | |
250 | const struct user_regset *regset, | |
251 | unsigned int pos, unsigned int count, | |
252 | const void *kbuf, const void __user *ubuf) | |
253 | { | |
254 | unsigned long *fpregs = target->thread.float_regs; | |
255 | int ret; | |
256 | ||
257 | #if 0 | |
258 | if (target == current) | |
259 | save_and_clear_fpu(); | |
260 | #endif | |
261 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
262 | fpregs, | |
263 | 0, 32 * sizeof(u32)); | |
264 | if (!ret) | |
265 | user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, | |
266 | 32 * sizeof(u32), | |
267 | 33 * sizeof(u32)); | |
268 | if (!ret && count > 0) { | |
269 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, | |
270 | &target->thread.fsr, | |
271 | 33 * sizeof(u32), | |
272 | 34 * sizeof(u32)); | |
273 | } | |
274 | ||
275 | if (!ret) | |
276 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, | |
277 | 34 * sizeof(u32), -1); | |
278 | return ret; | |
279 | } | |
280 | ||
281 | static const struct user_regset sparc32_regsets[] = { | |
282 | /* Format is: | |
283 | * G0 --> G7 | |
284 | * O0 --> O7 | |
285 | * L0 --> L7 | |
286 | * I0 --> I7 | |
287 | * PSR, PC, nPC, Y, WIM, TBR | |
288 | */ | |
289 | [REGSET_GENERAL] = { | |
290 | .core_note_type = NT_PRSTATUS, | |
7d4ee289 | 291 | .n = 38, |
8e3fe806 DM |
292 | .size = sizeof(u32), .align = sizeof(u32), |
293 | .get = genregs32_get, .set = genregs32_set | |
294 | }, | |
295 | /* Format is: | |
296 | * F0 --> F31 | |
297 | * empty 32-bit word | |
298 | * FSR (32--bit word) | |
299 | * FPU QUEUE COUNT (8-bit char) | |
300 | * FPU QUEUE ENTRYSIZE (8-bit char) | |
301 | * FPU ENABLED (8-bit char) | |
302 | * empty 8-bit char | |
303 | * FPU QUEUE (64 32-bit ints) | |
304 | */ | |
305 | [REGSET_FP] = { | |
306 | .core_note_type = NT_PRFPREG, | |
7d4ee289 | 307 | .n = 99, |
8e3fe806 DM |
308 | .size = sizeof(u32), .align = sizeof(u32), |
309 | .get = fpregs32_get, .set = fpregs32_set | |
310 | }, | |
311 | }; | |
312 | ||
313 | static const struct user_regset_view user_sparc32_view = { | |
314 | .name = "sparc", .e_machine = EM_SPARC, | |
315 | .regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets) | |
316 | }; | |
317 | ||
318 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
319 | { | |
320 | return &user_sparc32_view; | |
321 | } | |
322 | ||
9775369e | 323 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 324 | { |
9775369e | 325 | unsigned long addr2 = current->thread.kregs->u_regs[UREG_I4]; |
d256eb8d DM |
326 | const struct user_regset_view *view; |
327 | int ret; | |
328 | ||
d786a4a6 | 329 | view = task_user_regset_view(current); |
1da177e4 LT |
330 | |
331 | switch(request) { | |
1da177e4 LT |
332 | case PTRACE_GETREGS: { |
333 | struct pt_regs __user *pregs = (struct pt_regs __user *) addr; | |
9775369e | 334 | |
d256eb8d DM |
335 | ret = copy_regset_to_user(child, view, REGSET_GENERAL, |
336 | 32 * sizeof(u32), | |
337 | 4 * sizeof(u32), | |
338 | &pregs->psr); | |
339 | if (!ret) | |
340 | copy_regset_to_user(child, view, REGSET_GENERAL, | |
341 | 1 * sizeof(u32), | |
342 | 15 * sizeof(u32), | |
343 | &pregs->u_regs[0]); | |
9775369e | 344 | break; |
1da177e4 LT |
345 | } |
346 | ||
347 | case PTRACE_SETREGS: { | |
348 | struct pt_regs __user *pregs = (struct pt_regs __user *) addr; | |
9775369e | 349 | |
d256eb8d DM |
350 | ret = copy_regset_from_user(child, view, REGSET_GENERAL, |
351 | 32 * sizeof(u32), | |
352 | 4 * sizeof(u32), | |
353 | &pregs->psr); | |
354 | if (!ret) | |
355 | copy_regset_from_user(child, view, REGSET_GENERAL, | |
356 | 1 * sizeof(u32), | |
357 | 15 * sizeof(u32), | |
358 | &pregs->u_regs[0]); | |
9775369e | 359 | break; |
1da177e4 LT |
360 | } |
361 | ||
362 | case PTRACE_GETFPREGS: { | |
363 | struct fps { | |
364 | unsigned long regs[32]; | |
365 | unsigned long fsr; | |
366 | unsigned long flags; | |
367 | unsigned long extra; | |
368 | unsigned long fpqd; | |
369 | struct fq { | |
370 | unsigned long *insnaddr; | |
371 | unsigned long insn; | |
372 | } fpq[16]; | |
373 | }; | |
374 | struct fps __user *fps = (struct fps __user *) addr; | |
1da177e4 | 375 | |
d256eb8d DM |
376 | ret = copy_regset_to_user(child, view, REGSET_FP, |
377 | 0 * sizeof(u32), | |
378 | 32 * sizeof(u32), | |
379 | &fps->regs[0]); | |
380 | if (!ret) | |
381 | ret = copy_regset_to_user(child, view, REGSET_FP, | |
382 | 33 * sizeof(u32), | |
383 | 1 * sizeof(u32), | |
384 | &fps->fsr); | |
385 | ||
386 | if (!ret) { | |
387 | if (__put_user(0, &fps->fpqd) || | |
388 | __put_user(0, &fps->flags) || | |
389 | __put_user(0, &fps->extra) || | |
390 | clear_user(fps->fpq, sizeof(fps->fpq))) | |
391 | ret = -EFAULT; | |
1da177e4 | 392 | } |
9775369e | 393 | break; |
1da177e4 LT |
394 | } |
395 | ||
396 | case PTRACE_SETFPREGS: { | |
397 | struct fps { | |
398 | unsigned long regs[32]; | |
399 | unsigned long fsr; | |
400 | unsigned long flags; | |
401 | unsigned long extra; | |
402 | unsigned long fpqd; | |
403 | struct fq { | |
404 | unsigned long *insnaddr; | |
405 | unsigned long insn; | |
406 | } fpq[16]; | |
407 | }; | |
408 | struct fps __user *fps = (struct fps __user *) addr; | |
1da177e4 | 409 | |
d256eb8d DM |
410 | ret = copy_regset_from_user(child, view, REGSET_FP, |
411 | 0 * sizeof(u32), | |
412 | 32 * sizeof(u32), | |
413 | &fps->regs[0]); | |
414 | if (!ret) | |
415 | ret = copy_regset_from_user(child, view, REGSET_FP, | |
416 | 33 * sizeof(u32), | |
417 | 1 * sizeof(u32), | |
418 | &fps->fsr); | |
9775369e | 419 | break; |
1da177e4 LT |
420 | } |
421 | ||
422 | case PTRACE_READTEXT: | |
9775369e DM |
423 | case PTRACE_READDATA: |
424 | ret = ptrace_readdata(child, addr, | |
425 | (void __user *) addr2, data); | |
426 | ||
427 | if (ret == data) | |
428 | ret = 0; | |
429 | else if (ret >= 0) | |
430 | ret = -EIO; | |
431 | break; | |
1da177e4 LT |
432 | |
433 | case PTRACE_WRITETEXT: | |
9775369e DM |
434 | case PTRACE_WRITEDATA: |
435 | ret = ptrace_writedata(child, (void __user *) addr2, | |
436 | addr, data); | |
437 | ||
438 | if (ret == data) | |
439 | ret = 0; | |
440 | else if (ret >= 0) | |
441 | ret = -EIO; | |
442 | break; | |
1da177e4 | 443 | |
9775369e | 444 | default: |
986bef85 DM |
445 | if (request == PTRACE_SPARC_DETACH) |
446 | request = PTRACE_DETACH; | |
9775369e DM |
447 | ret = ptrace_request(child, request, addr, data); |
448 | break; | |
1da177e4 LT |
449 | } |
450 | ||
9775369e | 451 | return ret; |
1da177e4 LT |
452 | } |
453 | ||
1c133b4b | 454 | asmlinkage int syscall_trace(struct pt_regs *regs, int syscall_exit_p) |
1da177e4 | 455 | { |
1c133b4b DM |
456 | int ret = 0; |
457 | ||
458 | if (test_thread_flag(TIF_SYSCALL_TRACE)) { | |
459 | if (syscall_exit_p) | |
460 | tracehook_report_syscall_exit(regs, 0); | |
461 | else | |
462 | ret = tracehook_report_syscall_entry(regs); | |
1da177e4 | 463 | } |
1c133b4b DM |
464 | |
465 | return ret; | |
1da177e4 | 466 | } |