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> | |
24 | #include <linux/smp_lock.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/ptrace.h> | |
0deef2c7 | 27 | #include <linux/regset.h> |
1da177e4 LT |
28 | #include <linux/user.h> |
29 | #include <linux/security.h> | |
7ed20e1a | 30 | #include <linux/signal.h> |
1d48d71c | 31 | #include <linux/compat.h> |
1da177e4 LT |
32 | |
33 | #include <asm/uaccess.h> | |
34 | #include <asm/page.h> | |
35 | #include <asm/pgtable.h> | |
36 | #include <asm/system.h> | |
21a62902 | 37 | |
1da177e4 LT |
38 | /* |
39 | * does not yet catch signals sent when the child dies. | |
40 | * in exit.c or in signal.c. | |
41 | */ | |
42 | ||
e17666ba BH |
43 | /* |
44 | * Here are the old "legacy" powerpc specific getregs/setregs ptrace calls, | |
45 | * we mark them as obsolete now, they will be removed in a future version | |
46 | */ | |
47 | static long compat_ptrace_old(struct task_struct *child, long request, | |
48 | long addr, long data) | |
49 | { | |
0deef2c7 RM |
50 | switch (request) { |
51 | case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */ | |
52 | return copy_regset_to_user(child, | |
53 | task_user_regset_view(current), 0, | |
54 | 0, 32 * sizeof(compat_long_t), | |
55 | compat_ptr(data)); | |
56 | ||
57 | case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */ | |
58 | return copy_regset_from_user(child, | |
59 | task_user_regset_view(current), 0, | |
60 | 0, 32 * sizeof(compat_long_t), | |
61 | compat_ptr(data)); | |
e17666ba BH |
62 | } |
63 | ||
0deef2c7 | 64 | return -EPERM; |
e17666ba BH |
65 | } |
66 | ||
9c75a31c MN |
67 | /* Macros to workout the correct index for the FPR in the thread struct */ |
68 | #define FPRNUMBER(i) (((i) - PT_FPR0) >> 1) | |
69 | #define FPRHALF(i) (((i) - PT_FPR0) & 1) | |
bc826666 MN |
70 | #define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) * 2 + FPRHALF(i) |
71 | #define FPRINDEX_3264(i) (TS_FPRWIDTH * ((i) - PT_FPR0)) | |
9c75a31c | 72 | |
81e695c0 RM |
73 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
74 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1da177e4 | 75 | { |
81e695c0 RM |
76 | unsigned long addr = caddr; |
77 | unsigned long data = cdata; | |
6b9c7ed8 | 78 | int ret; |
1da177e4 | 79 | |
1da177e4 | 80 | switch (request) { |
1da177e4 LT |
81 | /* |
82 | * Read 4 bytes of the other process' storage | |
83 | * data is a pointer specifying where the user wants the | |
84 | * 4 bytes copied into | |
85 | * addr is a pointer in the user's storage that contains an 8 byte | |
86 | * address in the other process of the 4 bytes that is to be read | |
87 | * (this is run in a 32-bit process looking at a 64-bit process) | |
88 | * when I and D space are separate, these will need to be fixed. | |
89 | */ | |
90 | case PPC_PTRACE_PEEKTEXT_3264: | |
91 | case PPC_PTRACE_PEEKDATA_3264: { | |
92 | u32 tmp; | |
93 | int copied; | |
94 | u32 __user * addrOthers; | |
95 | ||
96 | ret = -EIO; | |
97 | ||
98 | /* Get the addr in the other process that we want to read */ | |
99 | if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) | |
100 | break; | |
101 | ||
102 | copied = access_process_vm(child, (u64)addrOthers, &tmp, | |
103 | sizeof(tmp), 0); | |
104 | if (copied != sizeof(tmp)) | |
105 | break; | |
106 | ret = put_user(tmp, (u32 __user *)data); | |
107 | break; | |
108 | } | |
109 | ||
110 | /* Read a register (specified by ADDR) out of the "user area" */ | |
111 | case PTRACE_PEEKUSR: { | |
112 | int index; | |
113 | unsigned long tmp; | |
114 | ||
115 | ret = -EIO; | |
116 | /* convert to index and check */ | |
117 | index = (unsigned long) addr >> 2; | |
118 | if ((addr & 3) || (index > PT_FPSCR32)) | |
119 | break; | |
120 | ||
fabca2c0 | 121 | CHECK_FULL_REGS(child->thread.regs); |
1da177e4 | 122 | if (index < PT_FPR0) { |
865418d8 | 123 | tmp = ptrace_get_reg(child, index); |
1da177e4 LT |
124 | } else { |
125 | flush_fp_to_thread(child); | |
126 | /* | |
127 | * the user space code considers the floating point | |
128 | * to be an array of unsigned int (32 bits) - the | |
129 | * index passed in is based on this assumption. | |
130 | */ | |
9c75a31c MN |
131 | tmp = ((unsigned int *)child->thread.fpr) |
132 | [FPRINDEX(index)]; | |
1da177e4 LT |
133 | } |
134 | ret = put_user((unsigned int)tmp, (u32 __user *)data); | |
135 | break; | |
136 | } | |
137 | ||
138 | /* | |
139 | * Read 4 bytes out of the other process' pt_regs area | |
140 | * data is a pointer specifying where the user wants the | |
141 | * 4 bytes copied into | |
142 | * addr is the offset into the other process' pt_regs structure | |
143 | * that is to be read | |
144 | * (this is run in a 32-bit process looking at a 64-bit process) | |
145 | */ | |
146 | case PPC_PTRACE_PEEKUSR_3264: { | |
147 | u32 index; | |
148 | u32 reg32bits; | |
149 | u64 tmp; | |
150 | u32 numReg; | |
151 | u32 part; | |
152 | ||
153 | ret = -EIO; | |
154 | /* Determine which register the user wants */ | |
155 | index = (u64)addr >> 2; | |
156 | numReg = index / 2; | |
157 | /* Determine which part of the register the user wants */ | |
158 | if (index % 2) | |
159 | part = 1; /* want the 2nd half of the register (right-most). */ | |
160 | else | |
161 | part = 0; /* want the 1st half of the register (left-most). */ | |
162 | ||
912000e7 BH |
163 | /* Validate the input - check to see if address is on the wrong boundary |
164 | * or beyond the end of the user area | |
165 | */ | |
1da177e4 LT |
166 | if ((addr & 3) || numReg > PT_FPSCR) |
167 | break; | |
168 | ||
fabca2c0 | 169 | CHECK_FULL_REGS(child->thread.regs); |
1da177e4 LT |
170 | if (numReg >= PT_FPR0) { |
171 | flush_fp_to_thread(child); | |
bc826666 MN |
172 | /* get 64 bit FPR */ |
173 | tmp = ((u64 *)child->thread.fpr) | |
174 | [FPRINDEX_3264(numReg)]; | |
1da177e4 | 175 | } else { /* register within PT_REGS struct */ |
865418d8 | 176 | tmp = ptrace_get_reg(child, numReg); |
1da177e4 LT |
177 | } |
178 | reg32bits = ((u32*)&tmp)[part]; | |
179 | ret = put_user(reg32bits, (u32 __user *)data); | |
180 | break; | |
181 | } | |
182 | ||
1da177e4 LT |
183 | /* |
184 | * Write 4 bytes into the other process' storage | |
185 | * data is the 4 bytes that the user wants written | |
186 | * addr is a pointer in the user's storage that contains an | |
187 | * 8 byte address in the other process where the 4 bytes | |
188 | * that is to be written | |
189 | * (this is run in a 32-bit process looking at a 64-bit process) | |
190 | * when I and D space are separate, these will need to be fixed. | |
191 | */ | |
192 | case PPC_PTRACE_POKETEXT_3264: | |
193 | case PPC_PTRACE_POKEDATA_3264: { | |
194 | u32 tmp = data; | |
195 | u32 __user * addrOthers; | |
196 | ||
197 | /* Get the addr in the other process that we want to write into */ | |
198 | ret = -EIO; | |
199 | if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) | |
200 | break; | |
201 | ret = 0; | |
202 | if (access_process_vm(child, (u64)addrOthers, &tmp, | |
203 | sizeof(tmp), 1) == sizeof(tmp)) | |
204 | break; | |
205 | ret = -EIO; | |
206 | break; | |
207 | } | |
208 | ||
209 | /* write the word at location addr in the USER area */ | |
210 | case PTRACE_POKEUSR: { | |
211 | unsigned long index; | |
212 | ||
213 | ret = -EIO; | |
214 | /* convert to index and check */ | |
215 | index = (unsigned long) addr >> 2; | |
216 | if ((addr & 3) || (index > PT_FPSCR32)) | |
217 | break; | |
218 | ||
fabca2c0 | 219 | CHECK_FULL_REGS(child->thread.regs); |
1da177e4 | 220 | if (index < PT_FPR0) { |
865418d8 | 221 | ret = ptrace_put_reg(child, index, data); |
1da177e4 LT |
222 | } else { |
223 | flush_fp_to_thread(child); | |
224 | /* | |
225 | * the user space code considers the floating point | |
226 | * to be an array of unsigned int (32 bits) - the | |
227 | * index passed in is based on this assumption. | |
228 | */ | |
9c75a31c MN |
229 | ((unsigned int *)child->thread.fpr) |
230 | [FPRINDEX(index)] = data; | |
1da177e4 LT |
231 | ret = 0; |
232 | } | |
233 | break; | |
234 | } | |
235 | ||
236 | /* | |
237 | * Write 4 bytes into the other process' pt_regs area | |
238 | * data is the 4 bytes that the user wants written | |
239 | * addr is the offset into the other process' pt_regs structure | |
240 | * that is to be written into | |
241 | * (this is run in a 32-bit process looking at a 64-bit process) | |
242 | */ | |
243 | case PPC_PTRACE_POKEUSR_3264: { | |
244 | u32 index; | |
245 | u32 numReg; | |
246 | ||
247 | ret = -EIO; | |
248 | /* Determine which register the user wants */ | |
249 | index = (u64)addr >> 2; | |
250 | numReg = index / 2; | |
912000e7 | 251 | |
1da177e4 LT |
252 | /* |
253 | * Validate the input - check to see if address is on the | |
254 | * wrong boundary or beyond the end of the user area | |
255 | */ | |
256 | if ((addr & 3) || (numReg > PT_FPSCR)) | |
257 | break; | |
fabca2c0 | 258 | CHECK_FULL_REGS(child->thread.regs); |
912000e7 BH |
259 | if (numReg < PT_FPR0) { |
260 | unsigned long freg = ptrace_get_reg(child, numReg); | |
261 | if (index % 2) | |
262 | freg = (freg & ~0xfffffffful) | (data & 0xfffffffful); | |
263 | else | |
264 | freg = (freg & 0xfffffffful) | (data << 32); | |
265 | ret = ptrace_put_reg(child, numReg, freg); | |
266 | } else { | |
bc826666 | 267 | u64 *tmp; |
1da177e4 | 268 | flush_fp_to_thread(child); |
bc826666 MN |
269 | /* get 64 bit FPR ... */ |
270 | tmp = &(((u64 *)child->thread.fpr) | |
271 | [FPRINDEX_3264(numReg)]); | |
272 | /* ... write the 32 bit part we want */ | |
273 | ((u32 *)tmp)[index % 2] = data; | |
912000e7 | 274 | ret = 0; |
1da177e4 | 275 | } |
1da177e4 LT |
276 | break; |
277 | } | |
278 | ||
fd9648df AB |
279 | case PTRACE_GET_DEBUGREG: { |
280 | ret = -EINVAL; | |
281 | /* We only support one DABR and no IABRS at the moment */ | |
282 | if (addr > 0) | |
283 | break; | |
284 | ret = put_user(child->thread.dabr, (u32 __user *)data); | |
285 | break; | |
286 | } | |
287 | ||
0deef2c7 RM |
288 | case PTRACE_GETREGS: /* Get all pt_regs from the child. */ |
289 | return copy_regset_to_user( | |
290 | child, task_user_regset_view(current), 0, | |
291 | 0, PT_REGS_COUNT * sizeof(compat_long_t), | |
292 | compat_ptr(data)); | |
293 | ||
294 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
295 | return copy_regset_from_user( | |
296 | child, task_user_regset_view(current), 0, | |
297 | 0, PT_REGS_COUNT * sizeof(compat_long_t), | |
298 | compat_ptr(data)); | |
1da177e4 | 299 | |
e17666ba BH |
300 | case PTRACE_GETFPREGS: |
301 | case PTRACE_SETFPREGS: | |
962bca7f | 302 | case PTRACE_GETVRREGS: |
e17666ba | 303 | case PTRACE_SETVRREGS: |
33b3f03d MN |
304 | case PTRACE_GETVSRREGS: |
305 | case PTRACE_SETVSRREGS: | |
e17666ba BH |
306 | case PTRACE_GETREGS64: |
307 | case PTRACE_SETREGS64: | |
308 | case PPC_PTRACE_GETFPREGS: | |
309 | case PPC_PTRACE_SETFPREGS: | |
310 | case PTRACE_KILL: | |
311 | case PTRACE_SINGLESTEP: | |
312 | case PTRACE_DETACH: | |
313 | case PTRACE_SET_DEBUGREG: | |
314 | case PTRACE_SYSCALL: | |
315 | case PTRACE_CONT: | |
316 | ret = arch_ptrace(child, request, addr, data); | |
962bca7f RJ |
317 | break; |
318 | ||
e17666ba BH |
319 | /* Old reverse args ptrace callss */ |
320 | case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */ | |
321 | case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */ | |
322 | ret = compat_ptrace_old(child, request, addr, data); | |
962bca7f | 323 | break; |
962bca7f | 324 | |
1da177e4 | 325 | default: |
1d48d71c | 326 | ret = compat_ptrace_request(child, request, addr, data); |
1da177e4 LT |
327 | break; |
328 | } | |
81e695c0 | 329 | |
1da177e4 LT |
330 | return ret; |
331 | } |