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1da177e4 LT |
1 | /* |
2 | * linux/arch/ppc64/kernel/ptrace32.c | |
3 | * | |
4 | * PowerPC version | |
5 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
6 | * | |
7 | * Derived from "arch/m68k/kernel/ptrace.c" | |
8 | * Copyright (C) 1994 by Hamish Macdonald | |
9 | * Taken from linux/kernel/ptrace.c and modified for M680x0. | |
10 | * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds | |
11 | * | |
12 | * Modified by Cort Dougan (cort@hq.fsmlabs.com) | |
13 | * and Paul Mackerras (paulus@linuxcare.com.au). | |
14 | * | |
15 | * This file is subject to the terms and conditions of the GNU General | |
16 | * Public License. See the file README.legal in the main directory of | |
17 | * this archive for more details. | |
18 | */ | |
19 | ||
962bca7f | 20 | #include <linux/config.h> |
1da177e4 LT |
21 | #include <linux/kernel.h> |
22 | #include <linux/sched.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/smp.h> | |
25 | #include <linux/smp_lock.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/ptrace.h> | |
28 | #include <linux/user.h> | |
29 | #include <linux/security.h> | |
7ed20e1a | 30 | #include <linux/signal.h> |
1da177e4 LT |
31 | |
32 | #include <asm/uaccess.h> | |
33 | #include <asm/page.h> | |
34 | #include <asm/pgtable.h> | |
35 | #include <asm/system.h> | |
36 | #include <asm/ptrace-common.h> | |
37 | ||
38 | /* | |
39 | * does not yet catch signals sent when the child dies. | |
40 | * in exit.c or in signal.c. | |
41 | */ | |
42 | ||
b09a4913 | 43 | int compat_sys_ptrace(long request, long pid, unsigned long addr, unsigned long data) |
1da177e4 LT |
44 | { |
45 | struct task_struct *child; | |
46 | int ret = -EPERM; | |
47 | ||
48 | lock_kernel(); | |
49 | if (request == PTRACE_TRACEME) { | |
50 | /* are we already being traced? */ | |
51 | if (current->ptrace & PT_PTRACED) | |
52 | goto out; | |
53 | ret = security_ptrace(current->parent, current); | |
54 | if (ret) | |
55 | goto out; | |
56 | /* set the ptrace bit in the process flags. */ | |
57 | current->ptrace |= PT_PTRACED; | |
58 | ret = 0; | |
59 | goto out; | |
60 | } | |
61 | ret = -ESRCH; | |
62 | read_lock(&tasklist_lock); | |
63 | child = find_task_by_pid(pid); | |
64 | if (child) | |
65 | get_task_struct(child); | |
66 | read_unlock(&tasklist_lock); | |
67 | if (!child) | |
68 | goto out; | |
69 | ||
70 | ret = -EPERM; | |
71 | if (pid == 1) /* you may not mess with init */ | |
72 | goto out_tsk; | |
73 | ||
74 | if (request == PTRACE_ATTACH) { | |
75 | ret = ptrace_attach(child); | |
76 | goto out_tsk; | |
77 | } | |
78 | ||
79 | ret = ptrace_check_attach(child, request == PTRACE_KILL); | |
80 | if (ret < 0) | |
81 | goto out_tsk; | |
82 | ||
83 | switch (request) { | |
84 | /* when I and D space are separate, these will need to be fixed. */ | |
85 | case PTRACE_PEEKTEXT: /* read word at location addr. */ | |
86 | case PTRACE_PEEKDATA: { | |
87 | unsigned int tmp; | |
88 | int copied; | |
89 | ||
90 | copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); | |
91 | ret = -EIO; | |
92 | if (copied != sizeof(tmp)) | |
93 | break; | |
94 | ret = put_user(tmp, (u32 __user *)data); | |
95 | break; | |
96 | } | |
97 | ||
98 | /* | |
99 | * Read 4 bytes of the other process' storage | |
100 | * data is a pointer specifying where the user wants the | |
101 | * 4 bytes copied into | |
102 | * addr is a pointer in the user's storage that contains an 8 byte | |
103 | * address in the other process of the 4 bytes that is to be read | |
104 | * (this is run in a 32-bit process looking at a 64-bit process) | |
105 | * when I and D space are separate, these will need to be fixed. | |
106 | */ | |
107 | case PPC_PTRACE_PEEKTEXT_3264: | |
108 | case PPC_PTRACE_PEEKDATA_3264: { | |
109 | u32 tmp; | |
110 | int copied; | |
111 | u32 __user * addrOthers; | |
112 | ||
113 | ret = -EIO; | |
114 | ||
115 | /* Get the addr in the other process that we want to read */ | |
116 | if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) | |
117 | break; | |
118 | ||
119 | copied = access_process_vm(child, (u64)addrOthers, &tmp, | |
120 | sizeof(tmp), 0); | |
121 | if (copied != sizeof(tmp)) | |
122 | break; | |
123 | ret = put_user(tmp, (u32 __user *)data); | |
124 | break; | |
125 | } | |
126 | ||
127 | /* Read a register (specified by ADDR) out of the "user area" */ | |
128 | case PTRACE_PEEKUSR: { | |
129 | int index; | |
130 | unsigned long tmp; | |
131 | ||
132 | ret = -EIO; | |
133 | /* convert to index and check */ | |
134 | index = (unsigned long) addr >> 2; | |
135 | if ((addr & 3) || (index > PT_FPSCR32)) | |
136 | break; | |
137 | ||
138 | if (index < PT_FPR0) { | |
139 | tmp = get_reg(child, index); | |
140 | } else { | |
141 | flush_fp_to_thread(child); | |
142 | /* | |
143 | * the user space code considers the floating point | |
144 | * to be an array of unsigned int (32 bits) - the | |
145 | * index passed in is based on this assumption. | |
146 | */ | |
147 | tmp = ((unsigned int *)child->thread.fpr)[index - PT_FPR0]; | |
148 | } | |
149 | ret = put_user((unsigned int)tmp, (u32 __user *)data); | |
150 | break; | |
151 | } | |
152 | ||
153 | /* | |
154 | * Read 4 bytes out of the other process' pt_regs area | |
155 | * data is a pointer specifying where the user wants the | |
156 | * 4 bytes copied into | |
157 | * addr is the offset into the other process' pt_regs structure | |
158 | * that is to be read | |
159 | * (this is run in a 32-bit process looking at a 64-bit process) | |
160 | */ | |
161 | case PPC_PTRACE_PEEKUSR_3264: { | |
162 | u32 index; | |
163 | u32 reg32bits; | |
164 | u64 tmp; | |
165 | u32 numReg; | |
166 | u32 part; | |
167 | ||
168 | ret = -EIO; | |
169 | /* Determine which register the user wants */ | |
170 | index = (u64)addr >> 2; | |
171 | numReg = index / 2; | |
172 | /* Determine which part of the register the user wants */ | |
173 | if (index % 2) | |
174 | part = 1; /* want the 2nd half of the register (right-most). */ | |
175 | else | |
176 | part = 0; /* want the 1st half of the register (left-most). */ | |
177 | ||
178 | /* Validate the input - check to see if address is on the wrong boundary or beyond the end of the user area */ | |
179 | if ((addr & 3) || numReg > PT_FPSCR) | |
180 | break; | |
181 | ||
182 | if (numReg >= PT_FPR0) { | |
183 | flush_fp_to_thread(child); | |
184 | tmp = ((unsigned long int *)child->thread.fpr)[numReg - PT_FPR0]; | |
185 | } else { /* register within PT_REGS struct */ | |
186 | tmp = get_reg(child, numReg); | |
187 | } | |
188 | reg32bits = ((u32*)&tmp)[part]; | |
189 | ret = put_user(reg32bits, (u32 __user *)data); | |
190 | break; | |
191 | } | |
192 | ||
193 | /* If I and D space are separate, this will have to be fixed. */ | |
194 | case PTRACE_POKETEXT: /* write the word at location addr. */ | |
195 | case PTRACE_POKEDATA: { | |
196 | unsigned int tmp; | |
197 | tmp = data; | |
198 | ret = 0; | |
199 | if (access_process_vm(child, addr, &tmp, sizeof(tmp), 1) | |
200 | == sizeof(tmp)) | |
201 | break; | |
202 | ret = -EIO; | |
203 | break; | |
204 | } | |
205 | ||
206 | /* | |
207 | * Write 4 bytes into the other process' storage | |
208 | * data is the 4 bytes that the user wants written | |
209 | * addr is a pointer in the user's storage that contains an | |
210 | * 8 byte address in the other process where the 4 bytes | |
211 | * that is to be written | |
212 | * (this is run in a 32-bit process looking at a 64-bit process) | |
213 | * when I and D space are separate, these will need to be fixed. | |
214 | */ | |
215 | case PPC_PTRACE_POKETEXT_3264: | |
216 | case PPC_PTRACE_POKEDATA_3264: { | |
217 | u32 tmp = data; | |
218 | u32 __user * addrOthers; | |
219 | ||
220 | /* Get the addr in the other process that we want to write into */ | |
221 | ret = -EIO; | |
222 | if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) | |
223 | break; | |
224 | ret = 0; | |
225 | if (access_process_vm(child, (u64)addrOthers, &tmp, | |
226 | sizeof(tmp), 1) == sizeof(tmp)) | |
227 | break; | |
228 | ret = -EIO; | |
229 | break; | |
230 | } | |
231 | ||
232 | /* write the word at location addr in the USER area */ | |
233 | case PTRACE_POKEUSR: { | |
234 | unsigned long index; | |
235 | ||
236 | ret = -EIO; | |
237 | /* convert to index and check */ | |
238 | index = (unsigned long) addr >> 2; | |
239 | if ((addr & 3) || (index > PT_FPSCR32)) | |
240 | break; | |
241 | ||
242 | if (index == PT_ORIG_R3) | |
243 | break; | |
244 | if (index < PT_FPR0) { | |
245 | ret = put_reg(child, index, data); | |
246 | } else { | |
247 | flush_fp_to_thread(child); | |
248 | /* | |
249 | * the user space code considers the floating point | |
250 | * to be an array of unsigned int (32 bits) - the | |
251 | * index passed in is based on this assumption. | |
252 | */ | |
253 | ((unsigned int *)child->thread.fpr)[index - PT_FPR0] = data; | |
254 | ret = 0; | |
255 | } | |
256 | break; | |
257 | } | |
258 | ||
259 | /* | |
260 | * Write 4 bytes into the other process' pt_regs area | |
261 | * data is the 4 bytes that the user wants written | |
262 | * addr is the offset into the other process' pt_regs structure | |
263 | * that is to be written into | |
264 | * (this is run in a 32-bit process looking at a 64-bit process) | |
265 | */ | |
266 | case PPC_PTRACE_POKEUSR_3264: { | |
267 | u32 index; | |
268 | u32 numReg; | |
269 | ||
270 | ret = -EIO; | |
271 | /* Determine which register the user wants */ | |
272 | index = (u64)addr >> 2; | |
273 | numReg = index / 2; | |
274 | /* | |
275 | * Validate the input - check to see if address is on the | |
276 | * wrong boundary or beyond the end of the user area | |
277 | */ | |
278 | if ((addr & 3) || (numReg > PT_FPSCR)) | |
279 | break; | |
280 | /* Insure it is a register we let them change */ | |
281 | if ((numReg == PT_ORIG_R3) | |
282 | || ((numReg > PT_CCR) && (numReg < PT_FPR0))) | |
283 | break; | |
284 | if (numReg >= PT_FPR0) { | |
285 | flush_fp_to_thread(child); | |
286 | } | |
287 | if (numReg == PT_MSR) | |
288 | data = (data & MSR_DEBUGCHANGE) | |
289 | | (child->thread.regs->msr & ~MSR_DEBUGCHANGE); | |
290 | ((u32*)child->thread.regs)[index] = data; | |
291 | ret = 0; | |
292 | break; | |
293 | } | |
294 | ||
295 | case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ | |
296 | case PTRACE_CONT: { /* restart after signal. */ | |
297 | ret = -EIO; | |
7ed20e1a | 298 | if (!valid_signal(data)) |
1da177e4 LT |
299 | break; |
300 | if (request == PTRACE_SYSCALL) | |
301 | set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
302 | else | |
303 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
304 | child->exit_code = data; | |
305 | /* make sure the single step bit is not set. */ | |
306 | clear_single_step(child); | |
307 | wake_up_process(child); | |
308 | ret = 0; | |
309 | break; | |
310 | } | |
311 | ||
312 | /* | |
313 | * make the child exit. Best I can do is send it a sigkill. | |
314 | * perhaps it should be put in the status that it wants to | |
315 | * exit. | |
316 | */ | |
317 | case PTRACE_KILL: { | |
318 | ret = 0; | |
319 | if (child->exit_state == EXIT_ZOMBIE) /* already dead */ | |
320 | break; | |
321 | child->exit_code = SIGKILL; | |
322 | /* make sure the single step bit is not set. */ | |
323 | clear_single_step(child); | |
324 | wake_up_process(child); | |
325 | break; | |
326 | } | |
327 | ||
328 | case PTRACE_SINGLESTEP: { /* set the trap flag. */ | |
329 | ret = -EIO; | |
7ed20e1a | 330 | if (!valid_signal(data)) |
1da177e4 LT |
331 | break; |
332 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
333 | set_single_step(child); | |
334 | child->exit_code = data; | |
335 | /* give it a chance to run. */ | |
336 | wake_up_process(child); | |
337 | ret = 0; | |
338 | break; | |
339 | } | |
340 | ||
fd9648df AB |
341 | case PTRACE_GET_DEBUGREG: { |
342 | ret = -EINVAL; | |
343 | /* We only support one DABR and no IABRS at the moment */ | |
344 | if (addr > 0) | |
345 | break; | |
346 | ret = put_user(child->thread.dabr, (u32 __user *)data); | |
347 | break; | |
348 | } | |
349 | ||
350 | case PTRACE_SET_DEBUGREG: | |
351 | ret = ptrace_set_debugreg(child, addr, data); | |
352 | break; | |
353 | ||
1da177e4 LT |
354 | case PTRACE_DETACH: |
355 | ret = ptrace_detach(child, data); | |
356 | break; | |
357 | ||
358 | case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */ | |
359 | int i; | |
360 | unsigned long *reg = &((unsigned long *)child->thread.regs)[0]; | |
361 | unsigned int __user *tmp = (unsigned int __user *)addr; | |
362 | ||
363 | for (i = 0; i < 32; i++) { | |
364 | ret = put_user(*reg, tmp); | |
365 | if (ret) | |
366 | break; | |
367 | reg++; | |
368 | tmp++; | |
369 | } | |
370 | break; | |
371 | } | |
372 | ||
373 | case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */ | |
374 | int i; | |
375 | unsigned long *reg = &((unsigned long *)child->thread.regs)[0]; | |
376 | unsigned int __user *tmp = (unsigned int __user *)addr; | |
377 | ||
378 | for (i = 0; i < 32; i++) { | |
379 | ret = get_user(*reg, tmp); | |
380 | if (ret) | |
381 | break; | |
382 | reg++; | |
383 | tmp++; | |
384 | } | |
385 | break; | |
386 | } | |
387 | ||
388 | case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */ | |
389 | int i; | |
390 | unsigned long *reg = &((unsigned long *)child->thread.fpr)[0]; | |
391 | unsigned int __user *tmp = (unsigned int __user *)addr; | |
392 | ||
393 | flush_fp_to_thread(child); | |
394 | ||
395 | for (i = 0; i < 32; i++) { | |
396 | ret = put_user(*reg, tmp); | |
397 | if (ret) | |
398 | break; | |
399 | reg++; | |
400 | tmp++; | |
401 | } | |
402 | break; | |
403 | } | |
404 | ||
405 | case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */ | |
406 | int i; | |
407 | unsigned long *reg = &((unsigned long *)child->thread.fpr)[0]; | |
408 | unsigned int __user *tmp = (unsigned int __user *)addr; | |
409 | ||
410 | flush_fp_to_thread(child); | |
411 | ||
412 | for (i = 0; i < 32; i++) { | |
413 | ret = get_user(*reg, tmp); | |
414 | if (ret) | |
415 | break; | |
416 | reg++; | |
417 | tmp++; | |
418 | } | |
419 | break; | |
420 | } | |
421 | ||
df09ce4a AB |
422 | case PTRACE_GETEVENTMSG: |
423 | ret = put_user(child->ptrace_message, (unsigned int __user *) data); | |
424 | break; | |
1da177e4 | 425 | |
962bca7f RJ |
426 | #ifdef CONFIG_ALTIVEC |
427 | case PTRACE_GETVRREGS: | |
428 | /* Get the child altivec register state. */ | |
429 | flush_altivec_to_thread(child); | |
430 | ret = get_vrregs((unsigned long __user *)data, child); | |
431 | break; | |
432 | ||
433 | case PTRACE_SETVRREGS: | |
434 | /* Set the child altivec register state. */ | |
435 | flush_altivec_to_thread(child); | |
436 | ret = set_vrregs(child, (unsigned long __user *)data); | |
437 | break; | |
438 | #endif | |
439 | ||
1da177e4 LT |
440 | default: |
441 | ret = ptrace_request(child, request, addr, data); | |
442 | break; | |
443 | } | |
444 | out_tsk: | |
445 | put_task_struct(child); | |
446 | out: | |
447 | unlock_kernel(); | |
448 | return ret; | |
449 | } |