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/errno.h>
25 #include <linux/ptrace.h>
26 #include <linux/regset.h>
27 #include <linux/user.h>
28 #include <linux/security.h>
29 #include <linux/signal.h>
30 #include <linux/compat.h>
31
32 #include <asm/uaccess.h>
33 #include <asm/page.h>
34 #include <asm/pgtable.h>
35 #include <asm/switch_to.h>
36
37 /*
38 * does not yet catch signals sent when the child dies.
39 * in exit.c or in signal.c.
40 */
41
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 */
compat_ptrace_old(struct task_struct * child,long request,long addr,long data)46 static long compat_ptrace_old(struct task_struct *child, long request,
47 long addr, long data)
48 {
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));
61 }
62
63 return -EPERM;
64 }
65
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)
69 #define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) * 2 + FPRHALF(i)
70 #define FPRINDEX_3264(i) (TS_FPRWIDTH * ((i) - PT_FPR0))
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 /* get 64 bit FPR */
172 tmp = ((u64 *)child->thread.fpr)
173 [FPRINDEX_3264(numReg)];
174 } else { /* register within PT_REGS struct */
175 tmp = ptrace_get_reg(child, numReg);
176 }
177 reg32bits = ((u32*)&tmp)[part];
178 ret = put_user(reg32bits, (u32 __user *)data);
179 break;
180 }
181
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
218 CHECK_FULL_REGS(child->thread.regs);
219 if (index < PT_FPR0) {
220 ret = ptrace_put_reg(child, index, data);
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 */
228 ((unsigned int *)child->thread.fpr)
229 [FPRINDEX(index)] = data;
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;
250
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;
257 CHECK_FULL_REGS(child->thread.regs);
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 {
266 u64 *tmp;
267 flush_fp_to_thread(child);
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;
273 ret = 0;
274 }
275 break;
276 }
277
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 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
284 ret = put_user(child->thread.dac1, (u32 __user *)data);
285 #else
286 ret = put_user(child->thread.dabr, (u32 __user *)data);
287 #endif
288 break;
289 }
290
291 case PTRACE_GETREGS: /* Get all pt_regs from the child. */
292 return copy_regset_to_user(
293 child, task_user_regset_view(current), 0,
294 0, PT_REGS_COUNT * sizeof(compat_long_t),
295 compat_ptr(data));
296
297 case PTRACE_SETREGS: /* Set all gp regs in the child. */
298 return copy_regset_from_user(
299 child, task_user_regset_view(current), 0,
300 0, PT_REGS_COUNT * sizeof(compat_long_t),
301 compat_ptr(data));
302
303 case PTRACE_GETFPREGS:
304 case PTRACE_SETFPREGS:
305 case PTRACE_GETVRREGS:
306 case PTRACE_SETVRREGS:
307 case PTRACE_GETVSRREGS:
308 case PTRACE_SETVSRREGS:
309 case PTRACE_GETREGS64:
310 case PTRACE_SETREGS64:
311 case PPC_PTRACE_GETFPREGS:
312 case PPC_PTRACE_SETFPREGS:
313 case PTRACE_KILL:
314 case PTRACE_SINGLESTEP:
315 case PTRACE_DETACH:
316 case PTRACE_SET_DEBUGREG:
317 case PTRACE_SYSCALL:
318 case PTRACE_CONT:
319 case PPC_PTRACE_GETHWDBGINFO:
320 case PPC_PTRACE_SETHWDEBUG:
321 case PPC_PTRACE_DELHWDEBUG:
322 ret = arch_ptrace(child, request, addr, data);
323 break;
324
325 /* Old reverse args ptrace callss */
326 case PPC_PTRACE_GETREGS: /* Get GPRs 0 - 31. */
327 case PPC_PTRACE_SETREGS: /* Set GPRs 0 - 31. */
328 ret = compat_ptrace_old(child, request, addr, data);
329 break;
330
331 default:
332 ret = compat_ptrace_request(child, request, addr, data);
333 break;
334 }
335
336 return ret;
337 }
338