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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 | ||
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> | |
ae3a197e | 35 | #include <asm/switch_to.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 | ||
9c75a31c MN |
42 | /* Macros to workout the correct index for the FPR in the thread struct */ |
43 | #define FPRNUMBER(i) (((i) - PT_FPR0) >> 1) | |
44 | #define FPRHALF(i) (((i) - PT_FPR0) & 1) | |
bc826666 | 45 | #define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) * 2 + FPRHALF(i) |
9c75a31c | 46 | |
81e695c0 RM |
47 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
48 | compat_ulong_t caddr, compat_ulong_t cdata) | |
1da177e4 | 49 | { |
81e695c0 RM |
50 | unsigned long addr = caddr; |
51 | unsigned long data = cdata; | |
6b9c7ed8 | 52 | int ret; |
1da177e4 | 53 | |
1da177e4 | 54 | switch (request) { |
1da177e4 LT |
55 | /* |
56 | * Read 4 bytes of the other process' storage | |
57 | * data is a pointer specifying where the user wants the | |
58 | * 4 bytes copied into | |
59 | * addr is a pointer in the user's storage that contains an 8 byte | |
60 | * address in the other process of the 4 bytes that is to be read | |
61 | * (this is run in a 32-bit process looking at a 64-bit process) | |
62 | * when I and D space are separate, these will need to be fixed. | |
63 | */ | |
64 | case PPC_PTRACE_PEEKTEXT_3264: | |
65 | case PPC_PTRACE_PEEKDATA_3264: { | |
66 | u32 tmp; | |
67 | int copied; | |
68 | u32 __user * addrOthers; | |
69 | ||
70 | ret = -EIO; | |
71 | ||
72 | /* Get the addr in the other process that we want to read */ | |
73 | if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) | |
74 | break; | |
75 | ||
84d77d3f | 76 | copied = ptrace_access_vm(child, (u64)addrOthers, &tmp, |
f307ab6d | 77 | sizeof(tmp), FOLL_FORCE); |
1da177e4 LT |
78 | if (copied != sizeof(tmp)) |
79 | break; | |
80 | ret = put_user(tmp, (u32 __user *)data); | |
81 | break; | |
82 | } | |
83 | ||
84 | /* Read a register (specified by ADDR) out of the "user area" */ | |
85 | case PTRACE_PEEKUSR: { | |
86 | int index; | |
87 | unsigned long tmp; | |
88 | ||
89 | ret = -EIO; | |
90 | /* convert to index and check */ | |
91 | index = (unsigned long) addr >> 2; | |
92 | if ((addr & 3) || (index > PT_FPSCR32)) | |
93 | break; | |
94 | ||
fabca2c0 | 95 | CHECK_FULL_REGS(child->thread.regs); |
1da177e4 | 96 | if (index < PT_FPR0) { |
ee4a3916 AK |
97 | ret = ptrace_get_reg(child, index, &tmp); |
98 | if (ret) | |
99 | break; | |
1da177e4 LT |
100 | } else { |
101 | flush_fp_to_thread(child); | |
102 | /* | |
103 | * the user space code considers the floating point | |
104 | * to be an array of unsigned int (32 bits) - the | |
105 | * index passed in is based on this assumption. | |
106 | */ | |
de79f7b9 | 107 | tmp = ((unsigned int *)child->thread.fp_state.fpr) |
9c75a31c | 108 | [FPRINDEX(index)]; |
1da177e4 LT |
109 | } |
110 | ret = put_user((unsigned int)tmp, (u32 __user *)data); | |
111 | break; | |
112 | } | |
113 | ||
114 | /* | |
115 | * Read 4 bytes out of the other process' pt_regs area | |
116 | * data is a pointer specifying where the user wants the | |
117 | * 4 bytes copied into | |
118 | * addr is the offset into the other process' pt_regs structure | |
119 | * that is to be read | |
120 | * (this is run in a 32-bit process looking at a 64-bit process) | |
121 | */ | |
122 | case PPC_PTRACE_PEEKUSR_3264: { | |
123 | u32 index; | |
124 | u32 reg32bits; | |
125 | u64 tmp; | |
126 | u32 numReg; | |
127 | u32 part; | |
128 | ||
129 | ret = -EIO; | |
130 | /* Determine which register the user wants */ | |
131 | index = (u64)addr >> 2; | |
132 | numReg = index / 2; | |
133 | /* Determine which part of the register the user wants */ | |
134 | if (index % 2) | |
135 | part = 1; /* want the 2nd half of the register (right-most). */ | |
136 | else | |
137 | part = 0; /* want the 1st half of the register (left-most). */ | |
138 | ||
912000e7 BH |
139 | /* Validate the input - check to see if address is on the wrong boundary |
140 | * or beyond the end of the user area | |
141 | */ | |
1da177e4 LT |
142 | if ((addr & 3) || numReg > PT_FPSCR) |
143 | break; | |
144 | ||
fabca2c0 | 145 | CHECK_FULL_REGS(child->thread.regs); |
1da177e4 LT |
146 | if (numReg >= PT_FPR0) { |
147 | flush_fp_to_thread(child); | |
bc826666 | 148 | /* get 64 bit FPR */ |
de79f7b9 | 149 | tmp = child->thread.fp_state.fpr[numReg - PT_FPR0][0]; |
1da177e4 | 150 | } else { /* register within PT_REGS struct */ |
ee4a3916 AK |
151 | unsigned long tmp2; |
152 | ret = ptrace_get_reg(child, numReg, &tmp2); | |
153 | if (ret) | |
154 | break; | |
155 | tmp = tmp2; | |
1da177e4 LT |
156 | } |
157 | reg32bits = ((u32*)&tmp)[part]; | |
158 | ret = put_user(reg32bits, (u32 __user *)data); | |
159 | break; | |
160 | } | |
161 | ||
1da177e4 LT |
162 | /* |
163 | * Write 4 bytes into the other process' storage | |
164 | * data is the 4 bytes that the user wants written | |
165 | * addr is a pointer in the user's storage that contains an | |
166 | * 8 byte address in the other process where the 4 bytes | |
167 | * that is to be written | |
168 | * (this is run in a 32-bit process looking at a 64-bit process) | |
169 | * when I and D space are separate, these will need to be fixed. | |
170 | */ | |
171 | case PPC_PTRACE_POKETEXT_3264: | |
172 | case PPC_PTRACE_POKEDATA_3264: { | |
173 | u32 tmp = data; | |
174 | u32 __user * addrOthers; | |
175 | ||
176 | /* Get the addr in the other process that we want to write into */ | |
177 | ret = -EIO; | |
178 | if (get_user(addrOthers, (u32 __user * __user *)addr) != 0) | |
179 | break; | |
180 | ret = 0; | |
84d77d3f | 181 | if (ptrace_access_vm(child, (u64)addrOthers, &tmp, |
f307ab6d LS |
182 | sizeof(tmp), |
183 | FOLL_FORCE | FOLL_WRITE) == sizeof(tmp)) | |
1da177e4 LT |
184 | break; |
185 | ret = -EIO; | |
186 | break; | |
187 | } | |
188 | ||
189 | /* write the word at location addr in the USER area */ | |
190 | case PTRACE_POKEUSR: { | |
191 | unsigned long index; | |
192 | ||
193 | ret = -EIO; | |
194 | /* convert to index and check */ | |
195 | index = (unsigned long) addr >> 2; | |
196 | if ((addr & 3) || (index > PT_FPSCR32)) | |
197 | break; | |
198 | ||
fabca2c0 | 199 | CHECK_FULL_REGS(child->thread.regs); |
1da177e4 | 200 | if (index < PT_FPR0) { |
865418d8 | 201 | ret = ptrace_put_reg(child, index, data); |
1da177e4 LT |
202 | } else { |
203 | flush_fp_to_thread(child); | |
204 | /* | |
205 | * the user space code considers the floating point | |
206 | * to be an array of unsigned int (32 bits) - the | |
207 | * index passed in is based on this assumption. | |
208 | */ | |
de79f7b9 | 209 | ((unsigned int *)child->thread.fp_state.fpr) |
9c75a31c | 210 | [FPRINDEX(index)] = data; |
1da177e4 LT |
211 | ret = 0; |
212 | } | |
213 | break; | |
214 | } | |
215 | ||
216 | /* | |
217 | * Write 4 bytes into the other process' pt_regs area | |
218 | * data is the 4 bytes that the user wants written | |
219 | * addr is the offset into the other process' pt_regs structure | |
220 | * that is to be written into | |
221 | * (this is run in a 32-bit process looking at a 64-bit process) | |
222 | */ | |
223 | case PPC_PTRACE_POKEUSR_3264: { | |
224 | u32 index; | |
225 | u32 numReg; | |
226 | ||
227 | ret = -EIO; | |
228 | /* Determine which register the user wants */ | |
229 | index = (u64)addr >> 2; | |
230 | numReg = index / 2; | |
912000e7 | 231 | |
1da177e4 LT |
232 | /* |
233 | * Validate the input - check to see if address is on the | |
234 | * wrong boundary or beyond the end of the user area | |
235 | */ | |
236 | if ((addr & 3) || (numReg > PT_FPSCR)) | |
237 | break; | |
fabca2c0 | 238 | CHECK_FULL_REGS(child->thread.regs); |
912000e7 | 239 | if (numReg < PT_FPR0) { |
ee4a3916 AK |
240 | unsigned long freg; |
241 | ret = ptrace_get_reg(child, numReg, &freg); | |
242 | if (ret) | |
243 | break; | |
912000e7 BH |
244 | if (index % 2) |
245 | freg = (freg & ~0xfffffffful) | (data & 0xfffffffful); | |
246 | else | |
247 | freg = (freg & 0xfffffffful) | (data << 32); | |
248 | ret = ptrace_put_reg(child, numReg, freg); | |
249 | } else { | |
bc826666 | 250 | u64 *tmp; |
1da177e4 | 251 | flush_fp_to_thread(child); |
bc826666 | 252 | /* get 64 bit FPR ... */ |
de79f7b9 | 253 | tmp = &child->thread.fp_state.fpr[numReg - PT_FPR0][0]; |
bc826666 MN |
254 | /* ... write the 32 bit part we want */ |
255 | ((u32 *)tmp)[index % 2] = data; | |
912000e7 | 256 | ret = 0; |
1da177e4 | 257 | } |
1da177e4 LT |
258 | break; |
259 | } | |
260 | ||
fd9648df | 261 | case PTRACE_GET_DEBUGREG: { |
9422de3e MN |
262 | #ifndef CONFIG_PPC_ADV_DEBUG_REGS |
263 | unsigned long dabr_fake; | |
264 | #endif | |
fd9648df AB |
265 | ret = -EINVAL; |
266 | /* We only support one DABR and no IABRS at the moment */ | |
267 | if (addr > 0) | |
268 | break; | |
bb2c458b | 269 | #ifdef CONFIG_PPC_ADV_DEBUG_REGS |
51ae8d4a | 270 | ret = put_user(child->thread.debug.dac1, (u32 __user *)data); |
bb2c458b | 271 | #else |
9422de3e MN |
272 | dabr_fake = ( |
273 | (child->thread.hw_brk.address & (~HW_BRK_TYPE_DABR)) | | |
274 | (child->thread.hw_brk.type & HW_BRK_TYPE_DABR)); | |
275 | ret = put_user(dabr_fake, (u32 __user *)data); | |
bb2c458b | 276 | #endif |
fd9648df AB |
277 | break; |
278 | } | |
279 | ||
0deef2c7 RM |
280 | case PTRACE_GETREGS: /* Get all pt_regs from the child. */ |
281 | return copy_regset_to_user( | |
282 | child, task_user_regset_view(current), 0, | |
283 | 0, PT_REGS_COUNT * sizeof(compat_long_t), | |
284 | compat_ptr(data)); | |
285 | ||
286 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
287 | return copy_regset_from_user( | |
288 | child, task_user_regset_view(current), 0, | |
289 | 0, PT_REGS_COUNT * sizeof(compat_long_t), | |
290 | compat_ptr(data)); | |
1da177e4 | 291 | |
e17666ba BH |
292 | case PTRACE_GETFPREGS: |
293 | case PTRACE_SETFPREGS: | |
962bca7f | 294 | case PTRACE_GETVRREGS: |
e17666ba | 295 | case PTRACE_SETVRREGS: |
33b3f03d MN |
296 | case PTRACE_GETVSRREGS: |
297 | case PTRACE_SETVSRREGS: | |
e17666ba BH |
298 | case PTRACE_GETREGS64: |
299 | case PTRACE_SETREGS64: | |
e17666ba BH |
300 | case PTRACE_KILL: |
301 | case PTRACE_SINGLESTEP: | |
302 | case PTRACE_DETACH: | |
303 | case PTRACE_SET_DEBUGREG: | |
304 | case PTRACE_SYSCALL: | |
305 | case PTRACE_CONT: | |
bb2c458b AS |
306 | case PPC_PTRACE_GETHWDBGINFO: |
307 | case PPC_PTRACE_SETHWDEBUG: | |
308 | case PPC_PTRACE_DELHWDEBUG: | |
e17666ba | 309 | ret = arch_ptrace(child, request, addr, data); |
962bca7f RJ |
310 | break; |
311 | ||
1da177e4 | 312 | default: |
1d48d71c | 313 | ret = compat_ptrace_request(child, request, addr, data); |
1da177e4 LT |
314 | break; |
315 | } | |
81e695c0 | 316 | |
1da177e4 LT |
317 | return ret; |
318 | } |