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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/* 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)
45#define FPRINDEX(i) TS_FPRWIDTH * FPRNUMBER(i) * 2 + FPRHALF(i)
46#define FPRINDEX_3264(i) (TS_FPRWIDTH * ((i) - PT_FPR0))
47
48long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
49 compat_ulong_t caddr, compat_ulong_t cdata)
50{
51 unsigned long addr = caddr;
52 unsigned long data = cdata;
53 int ret;
54
55 switch (request) {
56 /*
57 * Read 4 bytes of the other process' storage
58 * data is a pointer specifying where the user wants the
59 * 4 bytes copied into
60 * addr is a pointer in the user's storage that contains an 8 byte
61 * address in the other process of the 4 bytes that is to be read
62 * (this is run in a 32-bit process looking at a 64-bit process)
63 * when I and D space are separate, these will need to be fixed.
64 */
65 case PPC_PTRACE_PEEKTEXT_3264:
66 case PPC_PTRACE_PEEKDATA_3264: {
67 u32 tmp;
68 int copied;
69 u32 __user * addrOthers;
70
71 ret = -EIO;
72
73 /* Get the addr in the other process that we want to read */
74 if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
75 break;
76
77 copied = access_process_vm(child, (u64)addrOthers, &tmp,
78 sizeof(tmp), 0);
79 if (copied != sizeof(tmp))
80 break;
81 ret = put_user(tmp, (u32 __user *)data);
82 break;
83 }
84
85 /* Read a register (specified by ADDR) out of the "user area" */
86 case PTRACE_PEEKUSR: {
87 int index;
88 unsigned long tmp;
89
90 ret = -EIO;
91 /* convert to index and check */
92 index = (unsigned long) addr >> 2;
93 if ((addr & 3) || (index > PT_FPSCR32))
94 break;
95
96 CHECK_FULL_REGS(child->thread.regs);
97 if (index < PT_FPR0) {
98 tmp = ptrace_get_reg(child, index);
99 } else {
100 flush_fp_to_thread(child);
101 /*
102 * the user space code considers the floating point
103 * to be an array of unsigned int (32 bits) - the
104 * index passed in is based on this assumption.
105 */
106 tmp = ((unsigned int *)child->thread.fpr)
107 [FPRINDEX(index)];
108 }
109 ret = put_user((unsigned int)tmp, (u32 __user *)data);
110 break;
111 }
112
113 /*
114 * Read 4 bytes out of the other process' pt_regs area
115 * data is a pointer specifying where the user wants the
116 * 4 bytes copied into
117 * addr is the offset into the other process' pt_regs structure
118 * that is to be read
119 * (this is run in a 32-bit process looking at a 64-bit process)
120 */
121 case PPC_PTRACE_PEEKUSR_3264: {
122 u32 index;
123 u32 reg32bits;
124 u64 tmp;
125 u32 numReg;
126 u32 part;
127
128 ret = -EIO;
129 /* Determine which register the user wants */
130 index = (u64)addr >> 2;
131 numReg = index / 2;
132 /* Determine which part of the register the user wants */
133 if (index % 2)
134 part = 1; /* want the 2nd half of the register (right-most). */
135 else
136 part = 0; /* want the 1st half of the register (left-most). */
137
138 /* Validate the input - check to see if address is on the wrong boundary
139 * or beyond the end of the user area
140 */
141 if ((addr & 3) || numReg > PT_FPSCR)
142 break;
143
144 CHECK_FULL_REGS(child->thread.regs);
145 if (numReg >= PT_FPR0) {
146 flush_fp_to_thread(child);
147 /* get 64 bit FPR */
148 tmp = ((u64 *)child->thread.fpr)
149 [FPRINDEX_3264(numReg)];
150 } else { /* register within PT_REGS struct */
151 tmp = ptrace_get_reg(child, numReg);
152 }
153 reg32bits = ((u32*)&tmp)[part];
154 ret = put_user(reg32bits, (u32 __user *)data);
155 break;
156 }
157
158 /*
159 * Write 4 bytes into the other process' storage
160 * data is the 4 bytes that the user wants written
161 * addr is a pointer in the user's storage that contains an
162 * 8 byte address in the other process where the 4 bytes
163 * that is to be written
164 * (this is run in a 32-bit process looking at a 64-bit process)
165 * when I and D space are separate, these will need to be fixed.
166 */
167 case PPC_PTRACE_POKETEXT_3264:
168 case PPC_PTRACE_POKEDATA_3264: {
169 u32 tmp = data;
170 u32 __user * addrOthers;
171
172 /* Get the addr in the other process that we want to write into */
173 ret = -EIO;
174 if (get_user(addrOthers, (u32 __user * __user *)addr) != 0)
175 break;
176 ret = 0;
177 if (access_process_vm(child, (u64)addrOthers, &tmp,
178 sizeof(tmp), 1) == sizeof(tmp))
179 break;
180 ret = -EIO;
181 break;
182 }
183
184 /* write the word at location addr in the USER area */
185 case PTRACE_POKEUSR: {
186 unsigned long index;
187
188 ret = -EIO;
189 /* convert to index and check */
190 index = (unsigned long) addr >> 2;
191 if ((addr & 3) || (index > PT_FPSCR32))
192 break;
193
194 CHECK_FULL_REGS(child->thread.regs);
195 if (index < PT_FPR0) {
196 ret = ptrace_put_reg(child, index, data);
197 } else {
198 flush_fp_to_thread(child);
199 /*
200 * the user space code considers the floating point
201 * to be an array of unsigned int (32 bits) - the
202 * index passed in is based on this assumption.
203 */
204 ((unsigned int *)child->thread.fpr)
205 [FPRINDEX(index)] = data;
206 ret = 0;
207 }
208 break;
209 }
210
211 /*
212 * Write 4 bytes into the other process' pt_regs area
213 * data is the 4 bytes that the user wants written
214 * addr is the offset into the other process' pt_regs structure
215 * that is to be written into
216 * (this is run in a 32-bit process looking at a 64-bit process)
217 */
218 case PPC_PTRACE_POKEUSR_3264: {
219 u32 index;
220 u32 numReg;
221
222 ret = -EIO;
223 /* Determine which register the user wants */
224 index = (u64)addr >> 2;
225 numReg = index / 2;
226
227 /*
228 * Validate the input - check to see if address is on the
229 * wrong boundary or beyond the end of the user area
230 */
231 if ((addr & 3) || (numReg > PT_FPSCR))
232 break;
233 CHECK_FULL_REGS(child->thread.regs);
234 if (numReg < PT_FPR0) {
235 unsigned long freg = ptrace_get_reg(child, numReg);
236 if (index % 2)
237 freg = (freg & ~0xfffffffful) | (data & 0xfffffffful);
238 else
239 freg = (freg & 0xfffffffful) | (data << 32);
240 ret = ptrace_put_reg(child, numReg, freg);
241 } else {
242 u64 *tmp;
243 flush_fp_to_thread(child);
244 /* get 64 bit FPR ... */
245 tmp = &(((u64 *)child->thread.fpr)
246 [FPRINDEX_3264(numReg)]);
247 /* ... write the 32 bit part we want */
248 ((u32 *)tmp)[index % 2] = data;
249 ret = 0;
250 }
251 break;
252 }
253
254 case PTRACE_GET_DEBUGREG: {
255 ret = -EINVAL;
256 /* We only support one DABR and no IABRS at the moment */
257 if (addr > 0)
258 break;
259#ifdef CONFIG_PPC_ADV_DEBUG_REGS
260 ret = put_user(child->thread.dac1, (u32 __user *)data);
261#else
262 ret = put_user(child->thread.dabr, (u32 __user *)data);
263#endif
264 break;
265 }
266
267 case PTRACE_GETREGS: /* Get all pt_regs from the child. */
268 return copy_regset_to_user(
269 child, task_user_regset_view(current), 0,
270 0, PT_REGS_COUNT * sizeof(compat_long_t),
271 compat_ptr(data));
272
273 case PTRACE_SETREGS: /* Set all gp regs in the child. */
274 return copy_regset_from_user(
275 child, task_user_regset_view(current), 0,
276 0, PT_REGS_COUNT * sizeof(compat_long_t),
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, request, addr, data);
297 break;
298
299 default:
300 ret = compat_ptrace_request(child, request, addr, data);
301 break;
302 }
303
304 return ret;
305}