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-rw-r--r--arch/mips/kernel/ptrace32.c285
1 files changed, 285 insertions, 0 deletions
diff --git a/arch/mips/kernel/ptrace32.c b/arch/mips/kernel/ptrace32.c
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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1992 Ross Biro
7 * Copyright (C) Linus Torvalds
8 * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
9 * Copyright (C) 1996 David S. Miller
10 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
11 * Copyright (C) 1999 MIPS Technologies, Inc.
12 * Copyright (C) 2000 Ulf Carlsson
13 *
14 * At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit
15 * binaries.
16 */
17#include <linux/compiler.h>
18#include <linux/kernel.h>
19#include <linux/sched.h>
20#include <linux/mm.h>
21#include <linux/errno.h>
22#include <linux/ptrace.h>
23#include <linux/smp.h>
24#include <linux/smp_lock.h>
25#include <linux/user.h>
26#include <linux/security.h>
27
28#include <asm/cpu.h>
29#include <asm/fpu.h>
30#include <asm/mipsregs.h>
31#include <asm/pgtable.h>
32#include <asm/page.h>
33#include <asm/system.h>
34#include <asm/uaccess.h>
35#include <asm/bootinfo.h>
36
37/*
38 * Tracing a 32-bit process with a 64-bit strace and vice versa will not
39 * work. I don't know how to fix this.
40 */
41asmlinkage int sys32_ptrace(int request, int pid, int addr, int data)
42{
43 struct task_struct *child;
44 int ret;
45
46#if 0
47 printk("ptrace(r=%d,pid=%d,addr=%08lx,data=%08lx)\n",
48 (int) request, (int) pid, (unsigned long) addr,
49 (unsigned long) data);
50#endif
51 lock_kernel();
52 ret = -EPERM;
53 if (request == PTRACE_TRACEME) {
54 /* are we already being traced? */
55 if (current->ptrace & PT_PTRACED)
56 goto out;
57 if ((ret = security_ptrace(current->parent, current)))
58 goto out;
59 /* set the ptrace bit in the process flags. */
60 current->ptrace |= PT_PTRACED;
61 ret = 0;
62 goto out;
63 }
64 ret = -ESRCH;
65 read_lock(&tasklist_lock);
66 child = find_task_by_pid(pid);
67 if (child)
68 get_task_struct(child);
69 read_unlock(&tasklist_lock);
70 if (!child)
71 goto out;
72
73 ret = -EPERM;
74 if (pid == 1) /* you may not mess with init */
75 goto out_tsk;
76
77 if (request == PTRACE_ATTACH) {
78 ret = ptrace_attach(child);
79 goto out_tsk;
80 }
81
82 ret = ptrace_check_attach(child, request == PTRACE_KILL);
83 if (ret < 0)
84 goto out_tsk;
85
86 switch (request) {
87 /* when I and D space are separate, these will need to be fixed. */
88 case PTRACE_PEEKTEXT: /* read word at location addr. */
89 case PTRACE_PEEKDATA: {
90 unsigned int tmp;
91 int copied;
92
93 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0);
94 ret = -EIO;
95 if (copied != sizeof(tmp))
96 break;
97 ret = put_user(tmp, (unsigned int *) (unsigned long) data);
98 break;
99 }
100
101 /* Read the word at location addr in the USER area. */
102 case PTRACE_PEEKUSR: {
103 struct pt_regs *regs;
104 unsigned int tmp;
105
106 regs = (struct pt_regs *) ((unsigned long) child->thread_info +
107 THREAD_SIZE - 32 - sizeof(struct pt_regs));
108 ret = 0; /* Default return value. */
109
110 switch (addr) {
111 case 0 ... 31:
112 tmp = regs->regs[addr];
113 break;
114 case FPR_BASE ... FPR_BASE + 31:
115 if (tsk_used_math(child)) {
116 fpureg_t *fregs = get_fpu_regs(child);
117
118 /*
119 * The odd registers are actually the high
120 * order bits of the values stored in the even
121 * registers - unless we're using r2k_switch.S.
122 */
123 if (addr & 1)
124 tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32);
125 else
126 tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff);
127 } else {
128 tmp = -1; /* FP not yet used */
129 }
130 break;
131 case PC:
132 tmp = regs->cp0_epc;
133 break;
134 case CAUSE:
135 tmp = regs->cp0_cause;
136 break;
137 case BADVADDR:
138 tmp = regs->cp0_badvaddr;
139 break;
140 case MMHI:
141 tmp = regs->hi;
142 break;
143 case MMLO:
144 tmp = regs->lo;
145 break;
146 case FPC_CSR:
147 if (cpu_has_fpu)
148 tmp = child->thread.fpu.hard.fcr31;
149 else
150 tmp = child->thread.fpu.soft.fcr31;
151 break;
152 case FPC_EIR: { /* implementation / version register */
153 unsigned int flags;
154
155 if (!cpu_has_fpu)
156 break;
157
158 flags = read_c0_status();
159 __enable_fpu();
160 __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp));
161 write_c0_status(flags);
162 break;
163 }
164 default:
165 tmp = 0;
166 ret = -EIO;
167 goto out_tsk;
168 }
169 ret = put_user(tmp, (unsigned *) (unsigned long) data);
170 break;
171 }
172
173 /* when I and D space are separate, this will have to be fixed. */
174 case PTRACE_POKETEXT: /* write the word at location addr. */
175 case PTRACE_POKEDATA:
176 ret = 0;
177 if (access_process_vm(child, addr, &data, sizeof(data), 1)
178 == sizeof(data))
179 break;
180 ret = -EIO;
181 break;
182
183 case PTRACE_POKEUSR: {
184 struct pt_regs *regs;
185 ret = 0;
186 regs = (struct pt_regs *) ((unsigned long) child->thread_info +
187 THREAD_SIZE - 32 - sizeof(struct pt_regs));
188
189 switch (addr) {
190 case 0 ... 31:
191 regs->regs[addr] = data;
192 break;
193 case FPR_BASE ... FPR_BASE + 31: {
194 fpureg_t *fregs = get_fpu_regs(child);
195
196 if (!tsk_used_math(child)) {
197 /* FP not yet used */
198 memset(&child->thread.fpu.hard, ~0,
199 sizeof(child->thread.fpu.hard));
200 child->thread.fpu.hard.fcr31 = 0;
201 }
202 /*
203 * The odd registers are actually the high order bits
204 * of the values stored in the even registers - unless
205 * we're using r2k_switch.S.
206 */
207 if (addr & 1) {
208 fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff;
209 fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32;
210 } else {
211 fregs[addr - FPR_BASE] &= ~0xffffffffLL;
212 /* Must cast, lest sign extension fill upper
213 bits! */
214 fregs[addr - FPR_BASE] |= (unsigned int)data;
215 }
216 break;
217 }
218 case PC:
219 regs->cp0_epc = data;
220 break;
221 case MMHI:
222 regs->hi = data;
223 break;
224 case MMLO:
225 regs->lo = data;
226 break;
227 case FPC_CSR:
228 if (cpu_has_fpu)
229 child->thread.fpu.hard.fcr31 = data;
230 else
231 child->thread.fpu.soft.fcr31 = data;
232 break;
233 default:
234 /* The rest are not allowed. */
235 ret = -EIO;
236 break;
237 }
238 break;
239 }
240
241 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
242 case PTRACE_CONT: { /* restart after signal. */
243 ret = -EIO;
244 if ((unsigned int) data > _NSIG)
245 break;
246 if (request == PTRACE_SYSCALL) {
247 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
248 }
249 else {
250 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
251 }
252 child->exit_code = data;
253 wake_up_process(child);
254 ret = 0;
255 break;
256 }
257
258 /*
259 * make the child exit. Best I can do is send it a sigkill.
260 * perhaps it should be put in the status that it wants to
261 * exit.
262 */
263 case PTRACE_KILL:
264 ret = 0;
265 if (child->exit_state == EXIT_ZOMBIE) /* already dead */
266 break;
267 child->exit_code = SIGKILL;
268 wake_up_process(child);
269 break;
270
271 case PTRACE_DETACH: /* detach a process that was attached. */
272 ret = ptrace_detach(child, data);
273 break;
274
275 default:
276 ret = ptrace_request(child, request, addr, data);
277 break;
278 }
279
280out_tsk:
281 put_task_struct(child);
282out:
283 unlock_kernel();
284 return ret;
285}
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