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Commit | Line | Data |
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1da177e4 | 1 | /* |
b123923d | 2 | * ptrace for 32-bit processes running on a 64-bit kernel. |
1da177e4 LT |
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) | |
b123923d | 13 | * and Paul Mackerras (paulus@samba.org). |
1da177e4 LT |
14 | * |
15 | * This file is subject to the terms and conditions of the GNU General | |
b123923d | 16 | * Public License. See the file COPYING in the main directory of |
1da177e4 LT |
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> | |
21a62902 PM |
36 | |
37 | #include "ptrace-common.h" | |
1da177e4 LT |
38 | |
39 | /* | |
40 | * does not yet catch signals sent when the child dies. | |
41 | * in exit.c or in signal.c. | |
42 | */ | |
43 | ||
734d6524 PM |
44 | long compat_sys_ptrace(int request, int pid, unsigned long addr, |
45 | unsigned long data) | |
1da177e4 LT |
46 | { |
47 | struct task_struct *child; | |
6b9c7ed8 | 48 | int ret; |
1da177e4 LT |
49 | |
50 | lock_kernel(); | |
51 | if (request == PTRACE_TRACEME) { | |
6b9c7ed8 | 52 | ret = ptrace_traceme(); |
1da177e4 LT |
53 | goto out; |
54 | } | |
1da177e4 | 55 | |
6b9c7ed8 CH |
56 | child = ptrace_get_task_struct(pid); |
57 | if (IS_ERR(child)) { | |
58 | ret = PTR_ERR(child); | |
59 | goto out; | |
60 | } | |
1da177e4 LT |
61 | |
62 | if (request == PTRACE_ATTACH) { | |
63 | ret = ptrace_attach(child); | |
64 | goto out_tsk; | |
65 | } | |
66 | ||
67 | ret = ptrace_check_attach(child, request == PTRACE_KILL); | |
68 | if (ret < 0) | |
69 | goto out_tsk; | |
70 | ||
71 | switch (request) { | |
72 | /* when I and D space are separate, these will need to be fixed. */ | |
73 | case PTRACE_PEEKTEXT: /* read word at location addr. */ | |
74 | case PTRACE_PEEKDATA: { | |
75 | unsigned int tmp; | |
76 | int copied; | |
77 | ||
78 | copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); | |
79 | ret = -EIO; | |
80 | if (copied != sizeof(tmp)) | |
81 | break; | |
82 | ret = put_user(tmp, (u32 __user *)data); | |
83 | break; | |
84 | } | |
85 | ||
86 | /* | |
87 | * Read 4 bytes of the other process' storage | |
88 | * data is a pointer specifying where the user wants the | |
89 | * 4 bytes copied into | |
90 | * addr is a pointer in the user's storage that contains an 8 byte | |
91 | * address in the other process of the 4 bytes that is to be read | |
92 | * (this is run in a 32-bit process looking at a 64-bit process) | |
93 | * when I and D space are separate, these will need to be fixed. | |
94 | */ | |
95 | case PPC_PTRACE_PEEKTEXT_3264: | |
96 | case PPC_PTRACE_PEEKDATA_3264: { | |
97 | u32 tmp; | |
98 | int copied; | |
99 | u32 __user * addrOthers; | |
100 | ||
101 | ret = -EIO; | |
102 | ||
103 | /* Get the addr in the other process that we want to read */ | |
104 | if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) | |
105 | break; | |
106 | ||
107 | copied = access_process_vm(child, (u64)addrOthers, &tmp, | |
108 | sizeof(tmp), 0); | |
109 | if (copied != sizeof(tmp)) | |
110 | break; | |
111 | ret = put_user(tmp, (u32 __user *)data); | |
112 | break; | |
113 | } | |
114 | ||
115 | /* Read a register (specified by ADDR) out of the "user area" */ | |
116 | case PTRACE_PEEKUSR: { | |
117 | int index; | |
118 | unsigned long tmp; | |
119 | ||
120 | ret = -EIO; | |
121 | /* convert to index and check */ | |
122 | index = (unsigned long) addr >> 2; | |
123 | if ((addr & 3) || (index > PT_FPSCR32)) | |
124 | break; | |
125 | ||
126 | if (index < PT_FPR0) { | |
127 | tmp = get_reg(child, index); | |
128 | } else { | |
129 | flush_fp_to_thread(child); | |
130 | /* | |
131 | * the user space code considers the floating point | |
132 | * to be an array of unsigned int (32 bits) - the | |
133 | * index passed in is based on this assumption. | |
134 | */ | |
135 | tmp = ((unsigned int *)child->thread.fpr)[index - PT_FPR0]; | |
136 | } | |
137 | ret = put_user((unsigned int)tmp, (u32 __user *)data); | |
138 | break; | |
139 | } | |
140 | ||
141 | /* | |
142 | * Read 4 bytes out of the other process' pt_regs area | |
143 | * data is a pointer specifying where the user wants the | |
144 | * 4 bytes copied into | |
145 | * addr is the offset into the other process' pt_regs structure | |
146 | * that is to be read | |
147 | * (this is run in a 32-bit process looking at a 64-bit process) | |
148 | */ | |
149 | case PPC_PTRACE_PEEKUSR_3264: { | |
150 | u32 index; | |
151 | u32 reg32bits; | |
152 | u64 tmp; | |
153 | u32 numReg; | |
154 | u32 part; | |
155 | ||
156 | ret = -EIO; | |
157 | /* Determine which register the user wants */ | |
158 | index = (u64)addr >> 2; | |
159 | numReg = index / 2; | |
160 | /* Determine which part of the register the user wants */ | |
161 | if (index % 2) | |
162 | part = 1; /* want the 2nd half of the register (right-most). */ | |
163 | else | |
164 | part = 0; /* want the 1st half of the register (left-most). */ | |
165 | ||
166 | /* Validate the input - check to see if address is on the wrong boundary or beyond the end of the user area */ | |
167 | if ((addr & 3) || numReg > PT_FPSCR) | |
168 | break; | |
169 | ||
170 | if (numReg >= PT_FPR0) { | |
171 | flush_fp_to_thread(child); | |
172 | tmp = ((unsigned long int *)child->thread.fpr)[numReg - PT_FPR0]; | |
173 | } else { /* register within PT_REGS struct */ | |
174 | tmp = get_reg(child, numReg); | |
175 | } | |
176 | reg32bits = ((u32*)&tmp)[part]; | |
177 | ret = put_user(reg32bits, (u32 __user *)data); | |
178 | break; | |
179 | } | |
180 | ||
181 | /* If I and D space are separate, this will have to be fixed. */ | |
182 | case PTRACE_POKETEXT: /* write the word at location addr. */ | |
183 | case PTRACE_POKEDATA: { | |
184 | unsigned int tmp; | |
185 | tmp = data; | |
186 | ret = 0; | |
187 | if (access_process_vm(child, addr, &tmp, sizeof(tmp), 1) | |
188 | == sizeof(tmp)) | |
189 | break; | |
190 | ret = -EIO; | |
191 | break; | |
192 | } | |
193 | ||
194 | /* | |
195 | * Write 4 bytes into the other process' storage | |
196 | * data is the 4 bytes that the user wants written | |
197 | * addr is a pointer in the user's storage that contains an | |
198 | * 8 byte address in the other process where the 4 bytes | |
199 | * that is to be written | |
200 | * (this is run in a 32-bit process looking at a 64-bit process) | |
201 | * when I and D space are separate, these will need to be fixed. | |
202 | */ | |
203 | case PPC_PTRACE_POKETEXT_3264: | |
204 | case PPC_PTRACE_POKEDATA_3264: { | |
205 | u32 tmp = data; | |
206 | u32 __user * addrOthers; | |
207 | ||
208 | /* Get the addr in the other process that we want to write into */ | |
209 | ret = -EIO; | |
210 | if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) | |
211 | break; | |
212 | ret = 0; | |
213 | if (access_process_vm(child, (u64)addrOthers, &tmp, | |
214 | sizeof(tmp), 1) == sizeof(tmp)) | |
215 | break; | |
216 | ret = -EIO; | |
217 | break; | |
218 | } | |
219 | ||
220 | /* write the word at location addr in the USER area */ | |
221 | case PTRACE_POKEUSR: { | |
222 | unsigned long index; | |
223 | ||
224 | ret = -EIO; | |
225 | /* convert to index and check */ | |
226 | index = (unsigned long) addr >> 2; | |
227 | if ((addr & 3) || (index > PT_FPSCR32)) | |
228 | break; | |
229 | ||
230 | if (index == PT_ORIG_R3) | |
231 | break; | |
232 | if (index < PT_FPR0) { | |
233 | ret = put_reg(child, index, data); | |
234 | } else { | |
235 | flush_fp_to_thread(child); | |
236 | /* | |
237 | * the user space code considers the floating point | |
238 | * to be an array of unsigned int (32 bits) - the | |
239 | * index passed in is based on this assumption. | |
240 | */ | |
241 | ((unsigned int *)child->thread.fpr)[index - PT_FPR0] = data; | |
242 | ret = 0; | |
243 | } | |
244 | break; | |
245 | } | |
246 | ||
247 | /* | |
248 | * Write 4 bytes into the other process' pt_regs area | |
249 | * data is the 4 bytes that the user wants written | |
250 | * addr is the offset into the other process' pt_regs structure | |
251 | * that is to be written into | |
252 | * (this is run in a 32-bit process looking at a 64-bit process) | |
253 | */ | |
254 | case PPC_PTRACE_POKEUSR_3264: { | |
255 | u32 index; | |
256 | u32 numReg; | |
257 | ||
258 | ret = -EIO; | |
259 | /* Determine which register the user wants */ | |
260 | index = (u64)addr >> 2; | |
261 | numReg = index / 2; | |
262 | /* | |
263 | * Validate the input - check to see if address is on the | |
264 | * wrong boundary or beyond the end of the user area | |
265 | */ | |
266 | if ((addr & 3) || (numReg > PT_FPSCR)) | |
267 | break; | |
268 | /* Insure it is a register we let them change */ | |
269 | if ((numReg == PT_ORIG_R3) | |
270 | || ((numReg > PT_CCR) && (numReg < PT_FPR0))) | |
271 | break; | |
272 | if (numReg >= PT_FPR0) { | |
273 | flush_fp_to_thread(child); | |
274 | } | |
275 | if (numReg == PT_MSR) | |
276 | data = (data & MSR_DEBUGCHANGE) | |
277 | | (child->thread.regs->msr & ~MSR_DEBUGCHANGE); | |
278 | ((u32*)child->thread.regs)[index] = data; | |
279 | ret = 0; | |
280 | break; | |
281 | } | |
282 | ||
283 | case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ | |
284 | case PTRACE_CONT: { /* restart after signal. */ | |
285 | ret = -EIO; | |
7ed20e1a | 286 | if (!valid_signal(data)) |
1da177e4 LT |
287 | break; |
288 | if (request == PTRACE_SYSCALL) | |
289 | set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
290 | else | |
291 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
292 | child->exit_code = data; | |
293 | /* make sure the single step bit is not set. */ | |
294 | clear_single_step(child); | |
295 | wake_up_process(child); | |
296 | ret = 0; | |
297 | break; | |
298 | } | |
299 | ||
300 | /* | |
301 | * make the child exit. Best I can do is send it a sigkill. | |
302 | * perhaps it should be put in the status that it wants to | |
303 | * exit. | |
304 | */ | |
305 | case PTRACE_KILL: { | |
306 | ret = 0; | |
307 | if (child->exit_state == EXIT_ZOMBIE) /* already dead */ | |
308 | break; | |
309 | child->exit_code = SIGKILL; | |
310 | /* make sure the single step bit is not set. */ | |
311 | clear_single_step(child); | |
312 | wake_up_process(child); | |
313 | break; | |
314 | } | |
315 | ||
316 | case PTRACE_SINGLESTEP: { /* set the trap flag. */ | |
317 | ret = -EIO; | |
7ed20e1a | 318 | if (!valid_signal(data)) |
1da177e4 LT |
319 | break; |
320 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
321 | set_single_step(child); | |
322 | child->exit_code = data; | |
323 | /* give it a chance to run. */ | |
324 | wake_up_process(child); | |
325 | ret = 0; | |
326 | break; | |
327 | } | |
328 | ||
fd9648df AB |
329 | case PTRACE_GET_DEBUGREG: { |
330 | ret = -EINVAL; | |
331 | /* We only support one DABR and no IABRS at the moment */ | |
332 | if (addr > 0) | |
333 | break; | |
334 | ret = put_user(child->thread.dabr, (u32 __user *)data); | |
335 | break; | |
336 | } | |
337 | ||
338 | case PTRACE_SET_DEBUGREG: | |
339 | ret = ptrace_set_debugreg(child, addr, data); | |
340 | break; | |
341 | ||
1da177e4 LT |
342 | case PTRACE_DETACH: |
343 | ret = ptrace_detach(child, data); | |
344 | break; | |
345 | ||
346 | case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */ | |
347 | int i; | |
348 | unsigned long *reg = &((unsigned long *)child->thread.regs)[0]; | |
349 | unsigned int __user *tmp = (unsigned int __user *)addr; | |
350 | ||
351 | for (i = 0; i < 32; i++) { | |
352 | ret = put_user(*reg, tmp); | |
353 | if (ret) | |
354 | break; | |
355 | reg++; | |
356 | tmp++; | |
357 | } | |
358 | break; | |
359 | } | |
360 | ||
361 | case PPC_PTRACE_SETREGS: { /* Set GPRs 0 - 31. */ | |
362 | int i; | |
363 | unsigned long *reg = &((unsigned long *)child->thread.regs)[0]; | |
364 | unsigned int __user *tmp = (unsigned int __user *)addr; | |
365 | ||
366 | for (i = 0; i < 32; i++) { | |
367 | ret = get_user(*reg, tmp); | |
368 | if (ret) | |
369 | break; | |
370 | reg++; | |
371 | tmp++; | |
372 | } | |
373 | break; | |
374 | } | |
375 | ||
376 | case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */ | |
377 | int i; | |
378 | unsigned long *reg = &((unsigned long *)child->thread.fpr)[0]; | |
379 | unsigned int __user *tmp = (unsigned int __user *)addr; | |
380 | ||
381 | flush_fp_to_thread(child); | |
382 | ||
383 | for (i = 0; i < 32; i++) { | |
384 | ret = put_user(*reg, tmp); | |
385 | if (ret) | |
386 | break; | |
387 | reg++; | |
388 | tmp++; | |
389 | } | |
390 | break; | |
391 | } | |
392 | ||
393 | case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */ | |
394 | int i; | |
395 | unsigned long *reg = &((unsigned long *)child->thread.fpr)[0]; | |
396 | unsigned int __user *tmp = (unsigned int __user *)addr; | |
397 | ||
398 | flush_fp_to_thread(child); | |
399 | ||
400 | for (i = 0; i < 32; i++) { | |
401 | ret = get_user(*reg, tmp); | |
402 | if (ret) | |
403 | break; | |
404 | reg++; | |
405 | tmp++; | |
406 | } | |
407 | break; | |
408 | } | |
409 | ||
df09ce4a AB |
410 | case PTRACE_GETEVENTMSG: |
411 | ret = put_user(child->ptrace_message, (unsigned int __user *) data); | |
412 | break; | |
1da177e4 | 413 | |
962bca7f RJ |
414 | #ifdef CONFIG_ALTIVEC |
415 | case PTRACE_GETVRREGS: | |
416 | /* Get the child altivec register state. */ | |
417 | flush_altivec_to_thread(child); | |
418 | ret = get_vrregs((unsigned long __user *)data, child); | |
419 | break; | |
420 | ||
421 | case PTRACE_SETVRREGS: | |
422 | /* Set the child altivec register state. */ | |
423 | flush_altivec_to_thread(child); | |
424 | ret = set_vrregs(child, (unsigned long __user *)data); | |
425 | break; | |
426 | #endif | |
427 | ||
1da177e4 LT |
428 | default: |
429 | ret = ptrace_request(child, request, addr, data); | |
430 | break; | |
431 | } | |
432 | out_tsk: | |
433 | put_task_struct(child); | |
434 | out: | |
435 | unlock_kernel(); | |
436 | return ret; | |
437 | } |