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1da177e4 LT |
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> | |
7ed20e1a | 27 | #include <linux/signal.h> |
1da177e4 LT |
28 | |
29 | #include <asm/cpu.h> | |
30 | #include <asm/fpu.h> | |
31 | #include <asm/mipsregs.h> | |
32 | #include <asm/pgtable.h> | |
33 | #include <asm/page.h> | |
34 | #include <asm/system.h> | |
35 | #include <asm/uaccess.h> | |
36 | #include <asm/bootinfo.h> | |
37 | ||
38 | /* | |
39 | * Tracing a 32-bit process with a 64-bit strace and vice versa will not | |
40 | * work. I don't know how to fix this. | |
41 | */ | |
42 | asmlinkage int sys32_ptrace(int request, int pid, int addr, int data) | |
43 | { | |
44 | struct task_struct *child; | |
45 | int ret; | |
46 | ||
47 | #if 0 | |
48 | printk("ptrace(r=%d,pid=%d,addr=%08lx,data=%08lx)\n", | |
49 | (int) request, (int) pid, (unsigned long) addr, | |
50 | (unsigned long) data); | |
51 | #endif | |
52 | lock_kernel(); | |
53 | ret = -EPERM; | |
54 | if (request == PTRACE_TRACEME) { | |
55 | /* are we already being traced? */ | |
56 | if (current->ptrace & PT_PTRACED) | |
57 | goto out; | |
58 | if ((ret = security_ptrace(current->parent, current))) | |
59 | goto out; | |
60 | /* set the ptrace bit in the process flags. */ | |
61 | current->ptrace |= PT_PTRACED; | |
62 | ret = 0; | |
63 | goto out; | |
64 | } | |
65 | ret = -ESRCH; | |
66 | read_lock(&tasklist_lock); | |
67 | child = find_task_by_pid(pid); | |
68 | if (child) | |
69 | get_task_struct(child); | |
70 | read_unlock(&tasklist_lock); | |
71 | if (!child) | |
72 | goto out; | |
73 | ||
74 | ret = -EPERM; | |
75 | if (pid == 1) /* you may not mess with init */ | |
76 | goto out_tsk; | |
77 | ||
78 | if (request == PTRACE_ATTACH) { | |
79 | ret = ptrace_attach(child); | |
80 | goto out_tsk; | |
81 | } | |
82 | ||
83 | ret = ptrace_check_attach(child, request == PTRACE_KILL); | |
84 | if (ret < 0) | |
85 | goto out_tsk; | |
86 | ||
87 | switch (request) { | |
88 | /* when I and D space are separate, these will need to be fixed. */ | |
89 | case PTRACE_PEEKTEXT: /* read word at location addr. */ | |
90 | case PTRACE_PEEKDATA: { | |
91 | unsigned int tmp; | |
92 | int copied; | |
93 | ||
94 | copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); | |
95 | ret = -EIO; | |
96 | if (copied != sizeof(tmp)) | |
97 | break; | |
98 | ret = put_user(tmp, (unsigned int *) (unsigned long) data); | |
99 | break; | |
100 | } | |
101 | ||
102 | /* Read the word at location addr in the USER area. */ | |
103 | case PTRACE_PEEKUSR: { | |
104 | struct pt_regs *regs; | |
105 | unsigned int tmp; | |
106 | ||
107 | regs = (struct pt_regs *) ((unsigned long) child->thread_info + | |
108 | THREAD_SIZE - 32 - sizeof(struct pt_regs)); | |
109 | ret = 0; /* Default return value. */ | |
110 | ||
111 | switch (addr) { | |
112 | case 0 ... 31: | |
113 | tmp = regs->regs[addr]; | |
114 | break; | |
115 | case FPR_BASE ... FPR_BASE + 31: | |
116 | if (tsk_used_math(child)) { | |
117 | fpureg_t *fregs = get_fpu_regs(child); | |
118 | ||
119 | /* | |
120 | * The odd registers are actually the high | |
121 | * order bits of the values stored in the even | |
122 | * registers - unless we're using r2k_switch.S. | |
123 | */ | |
124 | if (addr & 1) | |
125 | tmp = (unsigned long) (fregs[((addr & ~1) - 32)] >> 32); | |
126 | else | |
127 | tmp = (unsigned long) (fregs[(addr - 32)] & 0xffffffff); | |
128 | } else { | |
129 | tmp = -1; /* FP not yet used */ | |
130 | } | |
131 | break; | |
132 | case PC: | |
133 | tmp = regs->cp0_epc; | |
134 | break; | |
135 | case CAUSE: | |
136 | tmp = regs->cp0_cause; | |
137 | break; | |
138 | case BADVADDR: | |
139 | tmp = regs->cp0_badvaddr; | |
140 | break; | |
141 | case MMHI: | |
142 | tmp = regs->hi; | |
143 | break; | |
144 | case MMLO: | |
145 | tmp = regs->lo; | |
146 | break; | |
147 | case FPC_CSR: | |
148 | if (cpu_has_fpu) | |
149 | tmp = child->thread.fpu.hard.fcr31; | |
150 | else | |
151 | tmp = child->thread.fpu.soft.fcr31; | |
152 | break; | |
153 | case FPC_EIR: { /* implementation / version register */ | |
154 | unsigned int flags; | |
155 | ||
156 | if (!cpu_has_fpu) | |
157 | break; | |
158 | ||
159 | flags = read_c0_status(); | |
160 | __enable_fpu(); | |
161 | __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp)); | |
162 | write_c0_status(flags); | |
163 | break; | |
164 | } | |
165 | default: | |
166 | tmp = 0; | |
167 | ret = -EIO; | |
168 | goto out_tsk; | |
169 | } | |
170 | ret = put_user(tmp, (unsigned *) (unsigned long) data); | |
171 | break; | |
172 | } | |
173 | ||
174 | /* when I and D space are separate, this will have to be fixed. */ | |
175 | case PTRACE_POKETEXT: /* write the word at location addr. */ | |
176 | case PTRACE_POKEDATA: | |
177 | ret = 0; | |
178 | if (access_process_vm(child, addr, &data, sizeof(data), 1) | |
179 | == sizeof(data)) | |
180 | break; | |
181 | ret = -EIO; | |
182 | break; | |
183 | ||
184 | case PTRACE_POKEUSR: { | |
185 | struct pt_regs *regs; | |
186 | ret = 0; | |
187 | regs = (struct pt_regs *) ((unsigned long) child->thread_info + | |
188 | THREAD_SIZE - 32 - sizeof(struct pt_regs)); | |
189 | ||
190 | switch (addr) { | |
191 | case 0 ... 31: | |
192 | regs->regs[addr] = data; | |
193 | break; | |
194 | case FPR_BASE ... FPR_BASE + 31: { | |
195 | fpureg_t *fregs = get_fpu_regs(child); | |
196 | ||
197 | if (!tsk_used_math(child)) { | |
198 | /* FP not yet used */ | |
199 | memset(&child->thread.fpu.hard, ~0, | |
200 | sizeof(child->thread.fpu.hard)); | |
201 | child->thread.fpu.hard.fcr31 = 0; | |
202 | } | |
203 | /* | |
204 | * The odd registers are actually the high order bits | |
205 | * of the values stored in the even registers - unless | |
206 | * we're using r2k_switch.S. | |
207 | */ | |
208 | if (addr & 1) { | |
209 | fregs[(addr & ~1) - FPR_BASE] &= 0xffffffff; | |
210 | fregs[(addr & ~1) - FPR_BASE] |= ((unsigned long long) data) << 32; | |
211 | } else { | |
212 | fregs[addr - FPR_BASE] &= ~0xffffffffLL; | |
213 | /* Must cast, lest sign extension fill upper | |
214 | bits! */ | |
215 | fregs[addr - FPR_BASE] |= (unsigned int)data; | |
216 | } | |
217 | break; | |
218 | } | |
219 | case PC: | |
220 | regs->cp0_epc = data; | |
221 | break; | |
222 | case MMHI: | |
223 | regs->hi = data; | |
224 | break; | |
225 | case MMLO: | |
226 | regs->lo = data; | |
227 | break; | |
228 | case FPC_CSR: | |
229 | if (cpu_has_fpu) | |
230 | child->thread.fpu.hard.fcr31 = data; | |
231 | else | |
232 | child->thread.fpu.soft.fcr31 = data; | |
233 | break; | |
234 | default: | |
235 | /* The rest are not allowed. */ | |
236 | ret = -EIO; | |
237 | break; | |
238 | } | |
239 | break; | |
240 | } | |
241 | ||
242 | case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ | |
243 | case PTRACE_CONT: { /* restart after signal. */ | |
244 | ret = -EIO; | |
7ed20e1a | 245 | if (!valid_signal(data)) |
1da177e4 LT |
246 | break; |
247 | if (request == PTRACE_SYSCALL) { | |
248 | set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
249 | } | |
250 | else { | |
251 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
252 | } | |
253 | child->exit_code = data; | |
254 | wake_up_process(child); | |
255 | ret = 0; | |
256 | break; | |
257 | } | |
258 | ||
259 | /* | |
260 | * make the child exit. Best I can do is send it a sigkill. | |
261 | * perhaps it should be put in the status that it wants to | |
262 | * exit. | |
263 | */ | |
264 | case PTRACE_KILL: | |
265 | ret = 0; | |
266 | if (child->exit_state == EXIT_ZOMBIE) /* already dead */ | |
267 | break; | |
268 | child->exit_code = SIGKILL; | |
269 | wake_up_process(child); | |
270 | break; | |
271 | ||
272 | case PTRACE_DETACH: /* detach a process that was attached. */ | |
273 | ret = ptrace_detach(child, data); | |
274 | break; | |
275 | ||
276 | default: | |
277 | ret = ptrace_request(child, request, addr, data); | |
278 | break; | |
279 | } | |
280 | ||
281 | out_tsk: | |
282 | put_task_struct(child); | |
283 | out: | |
284 | unlock_kernel(); | |
285 | return ret; | |
286 | } |