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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 | ||
20 | #include <linux/kernel.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/smp.h> | |
24 | #include <linux/smp_lock.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/ptrace.h> | |
27 | #include <linux/user.h> | |
28 | #include <linux/security.h> | |
29 | ||
30 | #include <asm/uaccess.h> | |
31 | #include <asm/page.h> | |
32 | #include <asm/pgtable.h> | |
33 | #include <asm/system.h> | |
34 | #include <asm/ptrace-common.h> | |
35 | ||
36 | /* | |
37 | * does not yet catch signals sent when the child dies. | |
38 | * in exit.c or in signal.c. | |
39 | */ | |
40 | ||
41 | int sys32_ptrace(long request, long pid, unsigned long addr, unsigned long data) | |
42 | { | |
43 | struct task_struct *child; | |
44 | int ret = -EPERM; | |
45 | ||
46 | lock_kernel(); | |
47 | if (request == PTRACE_TRACEME) { | |
48 | /* are we already being traced? */ | |
49 | if (current->ptrace & PT_PTRACED) | |
50 | goto out; | |
51 | ret = security_ptrace(current->parent, current); | |
52 | if (ret) | |
53 | goto out; | |
54 | /* set the ptrace bit in the process flags. */ | |
55 | current->ptrace |= PT_PTRACED; | |
56 | ret = 0; | |
57 | goto out; | |
58 | } | |
59 | ret = -ESRCH; | |
60 | read_lock(&tasklist_lock); | |
61 | child = find_task_by_pid(pid); | |
62 | if (child) | |
63 | get_task_struct(child); | |
64 | read_unlock(&tasklist_lock); | |
65 | if (!child) | |
66 | goto out; | |
67 | ||
68 | ret = -EPERM; | |
69 | if (pid == 1) /* you may not mess with init */ | |
70 | goto out_tsk; | |
71 | ||
72 | if (request == PTRACE_ATTACH) { | |
73 | ret = ptrace_attach(child); | |
74 | goto out_tsk; | |
75 | } | |
76 | ||
77 | ret = ptrace_check_attach(child, request == PTRACE_KILL); | |
78 | if (ret < 0) | |
79 | goto out_tsk; | |
80 | ||
81 | switch (request) { | |
82 | /* when I and D space are separate, these will need to be fixed. */ | |
83 | case PTRACE_PEEKTEXT: /* read word at location addr. */ | |
84 | case PTRACE_PEEKDATA: { | |
85 | unsigned int tmp; | |
86 | int copied; | |
87 | ||
88 | copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); | |
89 | ret = -EIO; | |
90 | if (copied != sizeof(tmp)) | |
91 | break; | |
92 | ret = put_user(tmp, (u32 __user *)data); | |
93 | break; | |
94 | } | |
95 | ||
96 | /* | |
97 | * Read 4 bytes of the other process' storage | |
98 | * data is a pointer specifying where the user wants the | |
99 | * 4 bytes copied into | |
100 | * addr is a pointer in the user's storage that contains an 8 byte | |
101 | * address in the other process of the 4 bytes that is to be read | |
102 | * (this is run in a 32-bit process looking at a 64-bit process) | |
103 | * when I and D space are separate, these will need to be fixed. | |
104 | */ | |
105 | case PPC_PTRACE_PEEKTEXT_3264: | |
106 | case PPC_PTRACE_PEEKDATA_3264: { | |
107 | u32 tmp; | |
108 | int copied; | |
109 | u32 __user * addrOthers; | |
110 | ||
111 | ret = -EIO; | |
112 | ||
113 | /* Get the addr in the other process that we want to read */ | |
114 | if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) | |
115 | break; | |
116 | ||
117 | copied = access_process_vm(child, (u64)addrOthers, &tmp, | |
118 | sizeof(tmp), 0); | |
119 | if (copied != sizeof(tmp)) | |
120 | break; | |
121 | ret = put_user(tmp, (u32 __user *)data); | |
122 | break; | |
123 | } | |
124 | ||
125 | /* Read a register (specified by ADDR) out of the "user area" */ | |
126 | case PTRACE_PEEKUSR: { | |
127 | int index; | |
128 | unsigned long tmp; | |
129 | ||
130 | ret = -EIO; | |
131 | /* convert to index and check */ | |
132 | index = (unsigned long) addr >> 2; | |
133 | if ((addr & 3) || (index > PT_FPSCR32)) | |
134 | break; | |
135 | ||
136 | if (index < PT_FPR0) { | |
137 | tmp = get_reg(child, index); | |
138 | } else { | |
139 | flush_fp_to_thread(child); | |
140 | /* | |
141 | * the user space code considers the floating point | |
142 | * to be an array of unsigned int (32 bits) - the | |
143 | * index passed in is based on this assumption. | |
144 | */ | |
145 | tmp = ((unsigned int *)child->thread.fpr)[index - PT_FPR0]; | |
146 | } | |
147 | ret = put_user((unsigned int)tmp, (u32 __user *)data); | |
148 | break; | |
149 | } | |
150 | ||
151 | /* | |
152 | * Read 4 bytes out of the other process' pt_regs area | |
153 | * data is a pointer specifying where the user wants the | |
154 | * 4 bytes copied into | |
155 | * addr is the offset into the other process' pt_regs structure | |
156 | * that is to be read | |
157 | * (this is run in a 32-bit process looking at a 64-bit process) | |
158 | */ | |
159 | case PPC_PTRACE_PEEKUSR_3264: { | |
160 | u32 index; | |
161 | u32 reg32bits; | |
162 | u64 tmp; | |
163 | u32 numReg; | |
164 | u32 part; | |
165 | ||
166 | ret = -EIO; | |
167 | /* Determine which register the user wants */ | |
168 | index = (u64)addr >> 2; | |
169 | numReg = index / 2; | |
170 | /* Determine which part of the register the user wants */ | |
171 | if (index % 2) | |
172 | part = 1; /* want the 2nd half of the register (right-most). */ | |
173 | else | |
174 | part = 0; /* want the 1st half of the register (left-most). */ | |
175 | ||
176 | /* Validate the input - check to see if address is on the wrong boundary or beyond the end of the user area */ | |
177 | if ((addr & 3) || numReg > PT_FPSCR) | |
178 | break; | |
179 | ||
180 | if (numReg >= PT_FPR0) { | |
181 | flush_fp_to_thread(child); | |
182 | tmp = ((unsigned long int *)child->thread.fpr)[numReg - PT_FPR0]; | |
183 | } else { /* register within PT_REGS struct */ | |
184 | tmp = get_reg(child, numReg); | |
185 | } | |
186 | reg32bits = ((u32*)&tmp)[part]; | |
187 | ret = put_user(reg32bits, (u32 __user *)data); | |
188 | break; | |
189 | } | |
190 | ||
191 | /* If I and D space are separate, this will have to be fixed. */ | |
192 | case PTRACE_POKETEXT: /* write the word at location addr. */ | |
193 | case PTRACE_POKEDATA: { | |
194 | unsigned int tmp; | |
195 | tmp = data; | |
196 | ret = 0; | |
197 | if (access_process_vm(child, addr, &tmp, sizeof(tmp), 1) | |
198 | == sizeof(tmp)) | |
199 | break; | |
200 | ret = -EIO; | |
201 | break; | |
202 | } | |
203 | ||
204 | /* | |
205 | * Write 4 bytes into the other process' storage | |
206 | * data is the 4 bytes that the user wants written | |
207 | * addr is a pointer in the user's storage that contains an | |
208 | * 8 byte address in the other process where the 4 bytes | |
209 | * that is to be written | |
210 | * (this is run in a 32-bit process looking at a 64-bit process) | |
211 | * when I and D space are separate, these will need to be fixed. | |
212 | */ | |
213 | case PPC_PTRACE_POKETEXT_3264: | |
214 | case PPC_PTRACE_POKEDATA_3264: { | |
215 | u32 tmp = data; | |
216 | u32 __user * addrOthers; | |
217 | ||
218 | /* Get the addr in the other process that we want to write into */ | |
219 | ret = -EIO; | |
220 | if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) | |
221 | break; | |
222 | ret = 0; | |
223 | if (access_process_vm(child, (u64)addrOthers, &tmp, | |
224 | sizeof(tmp), 1) == sizeof(tmp)) | |
225 | break; | |
226 | ret = -EIO; | |
227 | break; | |
228 | } | |
229 | ||
230 | /* write the word at location addr in the USER area */ | |
231 | case PTRACE_POKEUSR: { | |
232 | unsigned long index; | |
233 | ||
234 | ret = -EIO; | |
235 | /* convert to index and check */ | |
236 | index = (unsigned long) addr >> 2; | |
237 | if ((addr & 3) || (index > PT_FPSCR32)) | |
238 | break; | |
239 | ||
240 | if (index == PT_ORIG_R3) | |
241 | break; | |
242 | if (index < PT_FPR0) { | |
243 | ret = put_reg(child, index, data); | |
244 | } else { | |
245 | flush_fp_to_thread(child); | |
246 | /* | |
247 | * the user space code considers the floating point | |
248 | * to be an array of unsigned int (32 bits) - the | |
249 | * index passed in is based on this assumption. | |
250 | */ | |
251 | ((unsigned int *)child->thread.fpr)[index - PT_FPR0] = data; | |
252 | ret = 0; | |
253 | } | |
254 | break; | |
255 | } | |
256 | ||
257 | /* | |
258 | * Write 4 bytes into the other process' pt_regs area | |
259 | * data is the 4 bytes that the user wants written | |
260 | * addr is the offset into the other process' pt_regs structure | |
261 | * that is to be written into | |
262 | * (this is run in a 32-bit process looking at a 64-bit process) | |
263 | */ | |
264 | case PPC_PTRACE_POKEUSR_3264: { | |
265 | u32 index; | |
266 | u32 numReg; | |
267 | ||
268 | ret = -EIO; | |
269 | /* Determine which register the user wants */ | |
270 | index = (u64)addr >> 2; | |
271 | numReg = index / 2; | |
272 | /* | |
273 | * Validate the input - check to see if address is on the | |
274 | * wrong boundary or beyond the end of the user area | |
275 | */ | |
276 | if ((addr & 3) || (numReg > PT_FPSCR)) | |
277 | break; | |
278 | /* Insure it is a register we let them change */ | |
279 | if ((numReg == PT_ORIG_R3) | |
280 | || ((numReg > PT_CCR) && (numReg < PT_FPR0))) | |
281 | break; | |
282 | if (numReg >= PT_FPR0) { | |
283 | flush_fp_to_thread(child); | |
284 | } | |
285 | if (numReg == PT_MSR) | |
286 | data = (data & MSR_DEBUGCHANGE) | |
287 | | (child->thread.regs->msr & ~MSR_DEBUGCHANGE); | |
288 | ((u32*)child->thread.regs)[index] = data; | |
289 | ret = 0; | |
290 | break; | |
291 | } | |
292 | ||
293 | case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ | |
294 | case PTRACE_CONT: { /* restart after signal. */ | |
295 | ret = -EIO; | |
296 | if ((unsigned long) data > _NSIG) | |
297 | break; | |
298 | if (request == PTRACE_SYSCALL) | |
299 | set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
300 | else | |
301 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
302 | child->exit_code = data; | |
303 | /* make sure the single step bit is not set. */ | |
304 | clear_single_step(child); | |
305 | wake_up_process(child); | |
306 | ret = 0; | |
307 | break; | |
308 | } | |
309 | ||
310 | /* | |
311 | * make the child exit. Best I can do is send it a sigkill. | |
312 | * perhaps it should be put in the status that it wants to | |
313 | * exit. | |
314 | */ | |
315 | case PTRACE_KILL: { | |
316 | ret = 0; | |
317 | if (child->exit_state == EXIT_ZOMBIE) /* already dead */ | |
318 | break; | |
319 | child->exit_code = SIGKILL; | |
320 | /* make sure the single step bit is not set. */ | |
321 | clear_single_step(child); | |
322 | wake_up_process(child); | |
323 | break; | |
324 | } | |
325 | ||
326 | case PTRACE_SINGLESTEP: { /* set the trap flag. */ | |
327 | ret = -EIO; | |
328 | if ((unsigned long) data > _NSIG) | |
329 | break; | |
330 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
331 | set_single_step(child); | |
332 | child->exit_code = data; | |
333 | /* give it a chance to run. */ | |
334 | wake_up_process(child); | |
335 | ret = 0; | |
336 | break; | |
337 | } | |
338 | ||
339 | case PTRACE_DETACH: | |
340 | ret = ptrace_detach(child, data); | |
341 | break; | |
342 | ||
343 | case PPC_PTRACE_GETREGS: { /* Get GPRs 0 - 31. */ | |
344 | int i; | |
345 | unsigned long *reg = &((unsigned long *)child->thread.regs)[0]; | |
346 | unsigned int __user *tmp = (unsigned int __user *)addr; | |
347 | ||
348 | for (i = 0; i < 32; i++) { | |
349 | ret = put_user(*reg, tmp); | |
350 | if (ret) | |
351 | break; | |
352 | reg++; | |
353 | tmp++; | |
354 | } | |
355 | break; | |
356 | } | |
357 | ||
358 | case PPC_PTRACE_SETREGS: { /* Set 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 = get_user(*reg, tmp); | |
365 | if (ret) | |
366 | break; | |
367 | reg++; | |
368 | tmp++; | |
369 | } | |
370 | break; | |
371 | } | |
372 | ||
373 | case PPC_PTRACE_GETFPREGS: { /* Get FPRs 0 - 31. */ | |
374 | int i; | |
375 | unsigned long *reg = &((unsigned long *)child->thread.fpr)[0]; | |
376 | unsigned int __user *tmp = (unsigned int __user *)addr; | |
377 | ||
378 | flush_fp_to_thread(child); | |
379 | ||
380 | for (i = 0; i < 32; i++) { | |
381 | ret = put_user(*reg, tmp); | |
382 | if (ret) | |
383 | break; | |
384 | reg++; | |
385 | tmp++; | |
386 | } | |
387 | break; | |
388 | } | |
389 | ||
390 | case PPC_PTRACE_SETFPREGS: { /* Get FPRs 0 - 31. */ | |
391 | int i; | |
392 | unsigned long *reg = &((unsigned long *)child->thread.fpr)[0]; | |
393 | unsigned int __user *tmp = (unsigned int __user *)addr; | |
394 | ||
395 | flush_fp_to_thread(child); | |
396 | ||
397 | for (i = 0; i < 32; i++) { | |
398 | ret = get_user(*reg, tmp); | |
399 | if (ret) | |
400 | break; | |
401 | reg++; | |
402 | tmp++; | |
403 | } | |
404 | break; | |
405 | } | |
406 | ||
407 | case PTRACE_GETEVENTMSG: | |
408 | ret = put_user(child->ptrace_message, (unsigned int __user *) data); | |
409 | break; | |
410 | ||
411 | default: | |
412 | ret = ptrace_request(child, request, addr, data); | |
413 | break; | |
414 | } | |
415 | out_tsk: | |
416 | put_task_struct(child); | |
417 | out: | |
418 | unlock_kernel(); | |
419 | return ret; | |
420 | } |