1 /* 1
2 * ptrace for 32-bit processes running on a 64
3 *
4 * PowerPC version
5 * Copyright (C) 1995-1996 Gary Thomas (gdt
6 *
7 * Derived from "arch/m68k/kernel/ptrace.c"
8 * Copyright (C) 1994 by Hamish Macdonald
9 * Taken from linux/kernel/ptrace.c and modif
10 * linux/kernel/ptrace.c is by Ross Biro 1/23
11 *
12 * Modified by Cort Dougan (cort@hq.fsmlabs.co
13 * and Paul Mackerras (paulus@samba.org).
14 *
15 * This file is subject to the terms and condi
16 * Public License. See the file COPYING in th
17 * this archive for more details.
18 */
19
20 #include <linux/ptrace.h>
21 #include <linux/regset.h>
22 #include <linux/compat.h>
23
24 #include <asm/switch_to.h>
25
26 #include "ptrace-decl.h"
27
28 /*
29 * does not yet catch signals sent when the ch
30 * in exit.c or in signal.c.
31 */
32
33 /* Macros to workout the correct index for the
34 #define FPRNUMBER(i) (((i) - PT_FPR0) >> 1)
35 #define FPRHALF(i) (((i) - PT_FPR0) & 1)
36 #define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i)
37
38 long compat_arch_ptrace(struct task_struct *ch
39 compat_ulong_t caddr,
40 {
41 unsigned long addr = caddr;
42 unsigned long data = cdata;
43 int ret;
44
45 switch (request) {
46 /*
47 * Read 4 bytes of the other process'
48 * data is a pointer specifying where
49 * 4 bytes copied into
50 * addr is a pointer in the user's st
51 * address in the other process o
52 * (this is run in a 32-bit process lo
53 * when I and D space are separate, th
54 */
55 case PPC_PTRACE_PEEKTEXT_3264:
56 case PPC_PTRACE_PEEKDATA_3264: {
57 u32 tmp;
58 int copied;
59 u32 __user * addrOthers;
60
61 ret = -EIO;
62
63 /* Get the addr in the other p
64 if (get_user(addrOthers, (u32
65 break;
66
67 copied = ptrace_access_vm(chil
68 sizeof(tmp), F
69 if (copied != sizeof(tmp))
70 break;
71 ret = put_user(tmp, (u32 __use
72 break;
73 }
74
75 /* Read a register (specified by ADDR)
76 case PTRACE_PEEKUSR: {
77 int index;
78 unsigned long tmp;
79
80 ret = -EIO;
81 /* convert to index and check
82 index = (unsigned long) addr >
83 if ((addr & 3) || (index > PT_
84 break;
85
86 if (index < PT_FPR0) {
87 ret = ptrace_get_reg(c
88 if (ret)
89 break;
90 } else {
91 flush_fp_to_thread(chi
92 /*
93 * the user space code
94 * to be an array of u
95 * index passed in is
96 */
97 tmp = ((unsigned int *
98 [FPRINDEX(inde
99 }
100 ret = put_user((unsigned int)t
101 break;
102 }
103
104 /*
105 * Read 4 bytes out of the other proce
106 * data is a pointer specifying where
107 * 4 bytes copied into
108 * addr is the offset into the other
109 * that is to be read
110 * (this is run in a 32-bit process lo
111 */
112 case PPC_PTRACE_PEEKUSR_3264: {
113 u32 index;
114 u32 reg32bits;
115 u64 tmp;
116 u32 numReg;
117 u32 part;
118
119 ret = -EIO;
120 /* Determine which register th
121 index = (u64)addr >> 2;
122 numReg = index / 2;
123 /* Determine which part of the
124 if (index % 2)
125 part = 1; /* want the
126 else
127 part = 0; /* want the
128
129 /* Validate the input - check
130 * or beyond the end of the us
131 */
132 if ((addr & 3) || numReg > PT_
133 break;
134
135 if (numReg >= PT_FPR0) {
136 flush_fp_to_thread(chi
137 /* get 64 bit FPR */
138 tmp = child->thread.fp
139 } else { /* register within PT
140 unsigned long tmp2;
141 ret = ptrace_get_reg(c
142 if (ret)
143 break;
144 tmp = tmp2;
145 }
146 reg32bits = ((u32*)&tmp)[part]
147 ret = put_user(reg32bits, (u32
148 break;
149 }
150
151 /*
152 * Write 4 bytes into the other proces
153 * data is the 4 bytes that the user
154 * addr is a pointer in the user's st
155 * 8 byte address in the other pr
156 * that is to be written
157 * (this is run in a 32-bit process lo
158 * when I and D space are separate, th
159 */
160 case PPC_PTRACE_POKETEXT_3264:
161 case PPC_PTRACE_POKEDATA_3264: {
162 u32 tmp = data;
163 u32 __user * addrOthers;
164
165 /* Get the addr in the other p
166 ret = -EIO;
167 if (get_user(addrOthers, (u32
168 break;
169 ret = 0;
170 if (ptrace_access_vm(child, (u
171 sizeof
172 FOLL_F
173 break;
174 ret = -EIO;
175 break;
176 }
177
178 /* write the word at location addr in
179 case PTRACE_POKEUSR: {
180 unsigned long index;
181
182 ret = -EIO;
183 /* convert to index and check
184 index = (unsigned long) addr >
185 if ((addr & 3) || (index > PT_
186 break;
187
188 if (index < PT_FPR0) {
189 ret = ptrace_put_reg(c
190 } else {
191 flush_fp_to_thread(chi
192 /*
193 * the user space code
194 * to be an array of u
195 * index passed in is
196 */
197 ((unsigned int *)child
198 [FPRINDEX(inde
199 ret = 0;
200 }
201 break;
202 }
203
204 /*
205 * Write 4 bytes into the other proces
206 * data is the 4 bytes that the user
207 * addr is the offset into the other
208 * that is to be written into
209 * (this is run in a 32-bit process lo
210 */
211 case PPC_PTRACE_POKEUSR_3264: {
212 u32 index;
213 u32 numReg;
214
215 ret = -EIO;
216 /* Determine which register th
217 index = (u64)addr >> 2;
218 numReg = index / 2;
219
220 /*
221 * Validate the input - check
222 * wrong boundary or beyond th
223 */
224 if ((addr & 3) || (numReg > PT
225 break;
226 if (numReg < PT_FPR0) {
227 unsigned long freg;
228 ret = ptrace_get_reg(c
229 if (ret)
230 break;
231 if (index % 2)
232 freg = (freg &
233 else
234 freg = (freg &
235 ret = ptrace_put_reg(c
236 } else {
237 u64 *tmp;
238 flush_fp_to_thread(chi
239 /* get 64 bit FPR ...
240 tmp = &child->thread.f
241 /* ... write the 32 bi
242 ((u32 *)tmp)[index % 2
243 ret = 0;
244 }
245 break;
246 }
247
248 case PTRACE_GET_DEBUGREG: {
249 #ifndef CONFIG_PPC_ADV_DEBUG_REGS
250 unsigned long dabr_fake;
251 #endif
252 ret = -EINVAL;
253 /* We only support one DABR an
254 if (addr > 0)
255 break;
256 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
257 ret = put_user(child->thread.d
258 #else
259 dabr_fake = (
260 (child->thread.hw_brk[
261 (child->thread.hw_brk[
262 ret = put_user(dabr_fake, (u32
263 #endif
264 break;
265 }
266
267 case PTRACE_GETREGS: /* Get all pt_
268 return copy_regset_to_user(
269 child, task_user_regse
270 0, PT_REGS_COUNT * siz
271 compat_ptr(data));
272
273 case PTRACE_SETREGS: /* Set all gp
274 return copy_regset_from_user(
275 child, task_user_regse
276 0, PT_REGS_COUNT * siz
277 compat_ptr(data));
278
279 case PTRACE_GETFPREGS:
280 case PTRACE_SETFPREGS:
281 case PTRACE_GETVRREGS:
282 case PTRACE_SETVRREGS:
283 case PTRACE_GETVSRREGS:
284 case PTRACE_SETVSRREGS:
285 case PTRACE_GETREGS64:
286 case PTRACE_SETREGS64:
287 case PTRACE_KILL:
288 case PTRACE_SINGLESTEP:
289 case PTRACE_DETACH:
290 case PTRACE_SET_DEBUGREG:
291 case PTRACE_SYSCALL:
292 case PTRACE_CONT:
293 case PPC_PTRACE_GETHWDBGINFO:
294 case PPC_PTRACE_SETHWDEBUG:
295 case PPC_PTRACE_DELHWDEBUG:
296 ret = arch_ptrace(child, reque
297 break;
298
299 default:
300 ret = compat_ptrace_request(ch
301 break;
302 }
303
304 return ret;
305 }
306
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