1 /*
2 * ptrace for 32-bit processes running on a 64-bit kernel.
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@samba.org).
14 *
15 * This file is subject to the terms and conditions of the GNU General
16 * Public License. See the file COPYING 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/regset.h>
28 #include <linux/user.h>
29 #include <linux/security.h>
30 #include <linux/signal.h>
31 #include <linux/compat.h>
32
33 #include <asm/uaccess.h>
34 #include <asm/page.h>
35 #include <asm/pgtable.h>
36 #include <asm/system.h>
37
38 /*
39 * does not yet catch signals sent when the child dies.
40 * in exit.c or in signal.c.
41 */
42
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 */
compat_ptrace_old(struct task_struct * child,long request,long addr,long data)47 static long compat_ptrace_old(struct task_struct *child, long request,
48 long addr, long data)
49 {
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));
62 }
63
64 return -EPERM;
65 }
66
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)
70 #define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) + FPRHALF(i)
71
compat_arch_ptrace(struct task_struct * child,compat_long_t request,compat_ulong_t caddr,compat_ulong_t cdata)72 long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
73 compat_ulong_t caddr, compat_ulong_t cdata)
74 {
75 unsigned long addr = caddr;
76 unsigned long data = cdata;
77 int ret;
78
79 switch (request) {
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
120 CHECK_FULL_REGS(child->thread.regs);
121 if (index < PT_FPR0) {
122 tmp = ptrace_get_reg(child, index);
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 */
130 tmp = ((unsigned int *)child->thread.fpr)
131 [FPRINDEX(index)];
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
162 /* Validate the input - check to see if address is on the wrong boundary
163 * or beyond the end of the user area
164 */
165 if ((addr & 3) || numReg > PT_FPSCR)
166 break;
167
168 CHECK_FULL_REGS(child->thread.regs);
169 if (numReg >= PT_FPR0) {
170 flush_fp_to_thread(child);
171 tmp = ((unsigned long int *)child->thread.fpr)
172 [FPRINDEX(numReg)];
173 } else { /* register within PT_REGS struct */
174 tmp = ptrace_get_reg(child, numReg);
175 }
176 reg32bits = ((u32*)&tmp)[part];
177 ret = put_user(reg32bits, (u32 __user *)data);
178 break;
179 }
180
181 /*
182 * Write 4 bytes into the other process' storage
183 * data is the 4 bytes that the user wants written
184 * addr is a pointer in the user's storage that contains an
185 * 8 byte address in the other process where the 4 bytes
186 * that is to be written
187 * (this is run in a 32-bit process looking at a 64-bit process)
188 * when I and D space are separate, these will need to be fixed.
189 */
190 case PPC_PTRACE_POKETEXT_3264:
191 case PPC_PTRACE_POKEDATA_3264: {
192 u32 tmp = data;
193 u32 __user * addrOthers;
194
195 /* Get the addr in the other process that we want to write into */
196 ret = -EIO;
197 if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
198 break;
199 ret = 0;
200 if (access_process_vm(child, (u64)addrOthers, &tmp,
201 sizeof(tmp), 1) == sizeof(tmp))
202 break;
203 ret = -EIO;
204 break;
205 }
206
207 /* write the word at location addr in the USER area */
208 case PTRACE_POKEUSR: {
209 unsigned long index;
210
211 ret = -EIO;
212 /* convert to index and check */
213 index = (unsigned long) addr >> 2;
214 if ((addr & 3) || (index > PT_FPSCR32))
215 break;
216
217 CHECK_FULL_REGS(child->thread.regs);
218 if (index < PT_FPR0) {
219 ret = ptrace_put_reg(child, index, data);
220 } else {
221 flush_fp_to_thread(child);
222 /*
223 * the user space code considers the floating point
224 * to be an array of unsigned int (32 bits) - the
225 * index passed in is based on this assumption.
226 */
227 ((unsigned int *)child->thread.fpr)
228 [FPRINDEX(index)] = data;
229 ret = 0;
230 }
231 break;
232 }
233
234 /*
235 * Write 4 bytes into the other process' pt_regs area
236 * data is the 4 bytes that the user wants written
237 * addr is the offset into the other process' pt_regs structure
238 * that is to be written into
239 * (this is run in a 32-bit process looking at a 64-bit process)
240 */
241 case PPC_PTRACE_POKEUSR_3264: {
242 u32 index;
243 u32 numReg;
244
245 ret = -EIO;
246 /* Determine which register the user wants */
247 index = (u64)addr >> 2;
248 numReg = index / 2;
249
250 /*
251 * Validate the input - check to see if address is on the
252 * wrong boundary or beyond the end of the user area
253 */
254 if ((addr & 3) || (numReg > PT_FPSCR))
255 break;
256 CHECK_FULL_REGS(child->thread.regs);
257 if (numReg < PT_FPR0) {
258 unsigned long freg = ptrace_get_reg(child, numReg);
259 if (index % 2)
260 freg = (freg & ~0xfffffffful) | (data & 0xfffffffful);
261 else
262 freg = (freg & 0xfffffffful) | (data << 32);
263 ret = ptrace_put_reg(child, numReg, freg);
264 } else {
265 flush_fp_to_thread(child);
266 ((unsigned int *)child->thread.regs)[index] = data;
267 ret = 0;
268 }
269 break;
270 }
271
272 case PTRACE_GET_DEBUGREG: {
273 ret = -EINVAL;
274 /* We only support one DABR and no IABRS at the moment */
275 if (addr > 0)
276 break;
277 ret = put_user(child->thread.dabr, (u32 __user *)data);
278 break;
279 }
280
281 case PTRACE_GETREGS: /* Get all pt_regs from the child. */
282 return copy_regset_to_user(
283 child, task_user_regset_view(current), 0,
284 0, PT_REGS_COUNT * sizeof(compat_long_t),
285 compat_ptr(data));
286
287 case PTRACE_SETREGS: /* Set all gp regs in the child. */
288 return copy_regset_from_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_GETFPREGS:
294 case PTRACE_SETFPREGS:
295 case PTRACE_GETVRREGS:
296 case PTRACE_SETVRREGS:
297 case PTRACE_GETVSRREGS:
298 case PTRACE_SETVSRREGS:
299 case PTRACE_GETREGS64:
300 case PTRACE_SETREGS64:
301 case PPC_PTRACE_GETFPREGS:
302 case PPC_PTRACE_SETFPREGS:
303 case PTRACE_KILL:
304 case PTRACE_SINGLESTEP:
305 case PTRACE_DETACH:
306 case PTRACE_SET_DEBUGREG:
307 case PTRACE_SYSCALL:
308 case PTRACE_CONT:
309 ret = arch_ptrace(child, request, addr, data);
310 break;
311
312 /* Old reverse args ptrace callss */
313 case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
314 case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
315 ret = compat_ptrace_old(child, request, addr, data);
316 break;
317
318 default:
319 ret = compat_ptrace_request(child, request, addr, data);
320 break;
321 }
322
323 return ret;
324 }
325