Commit | Line | Data |
---|---|---|
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 | ||
20 | #include <linux/kernel.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/smp.h> | |
1da177e4 LT |
24 | #include <linux/errno.h> |
25 | #include <linux/ptrace.h> | |
0deef2c7 | 26 | #include <linux/regset.h> |
1da177e4 LT |
27 | #include <linux/user.h> |
28 | #include <linux/security.h> | |
7ed20e1a | 29 | #include <linux/signal.h> |
1d48d71c | 30 | #include <linux/compat.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 | 36 | |
1da177e4 LT |
37 | /* |
38 | * does not yet catch signals sent when the child dies. | |
39 | * in exit.c or in signal.c. | |
40 | */ | |
41 | ||
e17666ba BH |
42 | /* |
43 | * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls, | |
44 | * we mark them as obsolete now, they will be removed in a future version | |
45 | */ | |
46 | static long compat_ptrace_old(struct task_struct *child, long request, | |
47 | long addr, long data) | |
48 | { | |
0deef2c7 RM |
49 | switch (request) { |
50 | case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */ | |
51 | return copy_regset_to_user(child, | |
52 | task_user_regset_view(current), 0, | |
53 | 0, 32 * sizeof(compat_long_t), | |
54 | compat_ptr(data)); | |
55 | ||
56 | case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */ | |
57 | return copy_regset_from_user(child, | |
58 | task_user_regset_view(current), 0, | |
59 | 0, 32 * sizeof(compat_long_t), | |
60 | compat_ptr(data)); | |
e17666ba BH |
61 | } |
62 | ||
0deef2c7 | 63 | return -EPERM; |
e17666ba BH |
64 | } |
65 | ||
9c75a31c MN |
66 | /* Macros to workout the correct index for the FPR in the thread struct */ |
67 | #define FPRNUMBER(i) (((i) - PT_FPR0) >> 1) | |
68 | #define FPRHALF(i) (((i) - PT_FPR0) & 1) | |
bc826666 MN |
69 | #define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) * 2 + FPRHALF(i) |
70 | #define FPRINDEX_3264(i) (TS_FPRWIDTH * ((i) - PT_FPR0)) | |
9c75a31c | 71 | |
81e695c0 RM |
72 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
73 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1da177e4 | 74 | { |
81e695c0 RM |
75 | unsigned long addr = caddr; |
76 | unsigned long data = cdata; | |
6b9c7ed8 | 77 | int ret; |
1da177e4 | 78 | |
1da177e4 | 79 | switch (request) { |
1da177e4 LT |
80 | /* |
81 | * Read 4 bytes of the other process' storage | |
82 | * data is a pointer specifying where the user wants the | |
83 | * 4 bytes copied into | |
84 | * addr is a pointer in the user's storage that contains an 8 byte | |
85 | * address in the other process of the 4 bytes that is to be read | |
86 | * (this is run in a 32-bit process looking at a 64-bit process) | |
87 | * when I and D space are separate, these will need to be fixed. | |
88 | */ | |
89 | case PPC_PTRACE_PEEKTEXT_3264: | |
90 | case PPC_PTRACE_PEEKDATA_3264: { | |
91 | u32 tmp; | |
92 | int copied; | |
93 | u32 __user * addrOthers; | |
94 | ||
95 | ret = -EIO; | |
96 | ||
97 | /* Get the addr in the other process that we want to read */ | |
98 | if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) | |
99 | break; | |
100 | ||
101 | copied = access_process_vm(child, (u64)addrOthers, &tmp, | |
102 | sizeof(tmp), 0); | |
103 | if (copied != sizeof(tmp)) | |
104 | break; | |
105 | ret = put_user(tmp, (u32 __user *)data); | |
106 | break; | |
107 | } | |
108 | ||
109 | /* Read a register (specified by ADDR) out of the "user area" */ | |
110 | case PTRACE_PEEKUSR: { | |
111 | int index; | |
112 | unsigned long tmp; | |
113 | ||
114 | ret = -EIO; | |
115 | /* convert to index and check */ | |
116 | index = (unsigned long) addr >> 2; | |
117 | if ((addr & 3) || (index > PT_FPSCR32)) | |
118 | break; | |
119 | ||
fabca2c0 | 120 | CHECK_FULL_REGS(child->thread.regs); |
1da177e4 | 121 | if (index < PT_FPR0) { |
865418d8 | 122 | tmp = ptrace_get_reg(child, index); |
1da177e4 LT |
123 | } else { |
124 | flush_fp_to_thread(child); | |
125 | /* | |
126 | * the user space code considers the floating point | |
127 | * to be an array of unsigned int (32 bits) - the | |
128 | * index passed in is based on this assumption. | |
129 | */ | |
9c75a31c MN |
130 | tmp = ((unsigned int *)child->thread.fpr) |
131 | [FPRINDEX(index)]; | |
1da177e4 LT |
132 | } |
133 | ret = put_user((unsigned int)tmp, (u32 __user *)data); | |
134 | break; | |
135 | } | |
136 | ||
137 | /* | |
138 | * Read 4 bytes out of the other process' pt_regs area | |
139 | * data is a pointer specifying where the user wants the | |
140 | * 4 bytes copied into | |
141 | * addr is the offset into the other process' pt_regs structure | |
142 | * that is to be read | |
143 | * (this is run in a 32-bit process looking at a 64-bit process) | |
144 | */ | |
145 | case PPC_PTRACE_PEEKUSR_3264: { | |
146 | u32 index; | |
147 | u32 reg32bits; | |
148 | u64 tmp; | |
149 | u32 numReg; | |
150 | u32 part; | |
151 | ||
152 | ret = -EIO; | |
153 | /* Determine which register the user wants */ | |
154 | index = (u64)addr >> 2; | |
155 | numReg = index / 2; | |
156 | /* Determine which part of the register the user wants */ | |
157 | if (index % 2) | |
158 | part = 1; /* want the 2nd half of the register (right-most). */ | |
159 | else | |
160 | part = 0; /* want the 1st half of the register (left-most). */ | |
161 | ||
912000e7 BH |
162 | /* Validate the input - check to see if address is on the wrong boundary |
163 | * or beyond the end of the user area | |
164 | */ | |
1da177e4 LT |
165 | if ((addr & 3) || numReg > PT_FPSCR) |
166 | break; | |
167 | ||
fabca2c0 | 168 | CHECK_FULL_REGS(child->thread.regs); |
1da177e4 LT |
169 | if (numReg >= PT_FPR0) { |
170 | flush_fp_to_thread(child); | |
bc826666 MN |
171 | /* get 64 bit FPR */ |
172 | tmp = ((u64 *)child->thread.fpr) | |
173 | [FPRINDEX_3264(numReg)]; | |
1da177e4 | 174 | } else { /* register within PT_REGS struct */ |
865418d8 | 175 | tmp = ptrace_get_reg(child, numReg); |
1da177e4 LT |
176 | } |
177 | reg32bits = ((u32*)&tmp)[part]; | |
178 | ret = put_user(reg32bits, (u32 __user *)data); | |
179 | break; | |
180 | } | |
181 | ||
1da177e4 LT |
182 | /* |
183 | * Write 4 bytes into the other process' storage | |
184 | * data is the 4 bytes that the user wants written | |
185 | * addr is a pointer in the user's storage that contains an | |
186 | * 8 byte address in the other process where the 4 bytes | |
187 | * that is to be written | |
188 | * (this is run in a 32-bit process looking at a 64-bit process) | |
189 | * when I and D space are separate, these will need to be fixed. | |
190 | */ | |
191 | case PPC_PTRACE_POKETEXT_3264: | |
192 | case PPC_PTRACE_POKEDATA_3264: { | |
193 | u32 tmp = data; | |
194 | u32 __user * addrOthers; | |
195 | ||
196 | /* Get the addr in the other process that we want to write into */ | |
197 | ret = -EIO; | |
198 | if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) | |
199 | break; | |
200 | ret = 0; | |
201 | if (access_process_vm(child, (u64)addrOthers, &tmp, | |
202 | sizeof(tmp), 1) == sizeof(tmp)) | |
203 | break; | |
204 | ret = -EIO; | |
205 | break; | |
206 | } | |
207 | ||
208 | /* write the word at location addr in the USER area */ | |
209 | case PTRACE_POKEUSR: { | |
210 | unsigned long index; | |
211 | ||
212 | ret = -EIO; | |
213 | /* convert to index and check */ | |
214 | index = (unsigned long) addr >> 2; | |
215 | if ((addr & 3) || (index > PT_FPSCR32)) | |
216 | break; | |
217 | ||
fabca2c0 | 218 | CHECK_FULL_REGS(child->thread.regs); |
1da177e4 | 219 | if (index < PT_FPR0) { |
865418d8 | 220 | ret = ptrace_put_reg(child, index, data); |
1da177e4 LT |
221 | } else { |
222 | flush_fp_to_thread(child); | |
223 | /* | |
224 | * the user space code considers the floating point | |
225 | * to be an array of unsigned int (32 bits) - the | |
226 | * index passed in is based on this assumption. | |
227 | */ | |
9c75a31c MN |
228 | ((unsigned int *)child->thread.fpr) |
229 | [FPRINDEX(index)] = data; | |
1da177e4 LT |
230 | ret = 0; |
231 | } | |
232 | break; | |
233 | } | |
234 | ||
235 | /* | |
236 | * Write 4 bytes into the other process' pt_regs area | |
237 | * data is the 4 bytes that the user wants written | |
238 | * addr is the offset into the other process' pt_regs structure | |
239 | * that is to be written into | |
240 | * (this is run in a 32-bit process looking at a 64-bit process) | |
241 | */ | |
242 | case PPC_PTRACE_POKEUSR_3264: { | |
243 | u32 index; | |
244 | u32 numReg; | |
245 | ||
246 | ret = -EIO; | |
247 | /* Determine which register the user wants */ | |
248 | index = (u64)addr >> 2; | |
249 | numReg = index / 2; | |
912000e7 | 250 | |
1da177e4 LT |
251 | /* |
252 | * Validate the input - check to see if address is on the | |
253 | * wrong boundary or beyond the end of the user area | |
254 | */ | |
255 | if ((addr & 3) || (numReg > PT_FPSCR)) | |
256 | break; | |
fabca2c0 | 257 | CHECK_FULL_REGS(child->thread.regs); |
912000e7 BH |
258 | if (numReg < PT_FPR0) { |
259 | unsigned long freg = ptrace_get_reg(child, numReg); | |
260 | if (index % 2) | |
261 | freg = (freg & ~0xfffffffful) | (data & 0xfffffffful); | |
262 | else | |
263 | freg = (freg & 0xfffffffful) | (data << 32); | |
264 | ret = ptrace_put_reg(child, numReg, freg); | |
265 | } else { | |
bc826666 | 266 | u64 *tmp; |
1da177e4 | 267 | flush_fp_to_thread(child); |
bc826666 MN |
268 | /* get 64 bit FPR ... */ |
269 | tmp = &(((u64 *)child->thread.fpr) | |
270 | [FPRINDEX_3264(numReg)]); | |
271 | /* ... write the 32 bit part we want */ | |
272 | ((u32 *)tmp)[index % 2] = data; | |
912000e7 | 273 | ret = 0; |
1da177e4 | 274 | } |
1da177e4 LT |
275 | break; |
276 | } | |
277 | ||
fd9648df AB |
278 | case PTRACE_GET_DEBUGREG: { |
279 | ret = -EINVAL; | |
280 | /* We only support one DABR and no IABRS at the moment */ | |
281 | if (addr > 0) | |
282 | break; | |
283 | ret = put_user(child->thread.dabr, (u32 __user *)data); | |
284 | break; | |
285 | } | |
286 | ||
0deef2c7 RM |
287 | case PTRACE_GETREGS: /* Get all pt_regs from the child. */ |
288 | return copy_regset_to_user( | |
289 | child, task_user_regset_view(current), 0, | |
290 | 0, PT_REGS_COUNT * sizeof(compat_long_t), | |
291 | compat_ptr(data)); | |
292 | ||
293 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
294 | return copy_regset_from_user( | |
295 | child, task_user_regset_view(current), 0, | |
296 | 0, PT_REGS_COUNT * sizeof(compat_long_t), | |
297 | compat_ptr(data)); | |
1da177e4 | 298 | |
e17666ba BH |
299 | case PTRACE_GETFPREGS: |
300 | case PTRACE_SETFPREGS: | |
962bca7f | 301 | case PTRACE_GETVRREGS: |
e17666ba | 302 | case PTRACE_SETVRREGS: |
33b3f03d MN |
303 | case PTRACE_GETVSRREGS: |
304 | case PTRACE_SETVSRREGS: | |
e17666ba BH |
305 | case PTRACE_GETREGS64: |
306 | case PTRACE_SETREGS64: | |
307 | case PPC_PTRACE_GETFPREGS: | |
308 | case PPC_PTRACE_SETFPREGS: | |
309 | case PTRACE_KILL: | |
310 | case PTRACE_SINGLESTEP: | |
311 | case PTRACE_DETACH: | |
312 | case PTRACE_SET_DEBUGREG: | |
313 | case PTRACE_SYSCALL: | |
314 | case PTRACE_CONT: | |
315 | ret = arch_ptrace(child, request, addr, data); | |
962bca7f RJ |
316 | break; |
317 | ||
e17666ba BH |
318 | /* Old reverse args ptrace callss */ |
319 | case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */ | |
320 | case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */ | |
321 | ret = compat_ptrace_old(child, request, addr, data); | |
962bca7f | 322 | break; |
962bca7f | 323 | |
1da177e4 | 324 | default: |
1d48d71c | 325 | ret = compat_ptrace_request(child, request, addr, data); |
1da177e4 LT |
326 | break; |
327 | } | |
81e695c0 | 328 | |
1da177e4 LT |
329 | return ret; |
330 | } |