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1da177e4 LT |
1 | /* |
2 | * linux/arch/h8300/kernel/ptrace.c | |
3 | * | |
4 | * Yoshinori Sato <ysato@users.sourceforge.jp> | |
5 | * | |
6 | * Based on: | |
7 | * linux/arch/m68k/kernel/ptrace.c | |
8 | * | |
9 | * Copyright (C) 1994 by Hamish Macdonald | |
10 | * Taken from linux/kernel/ptrace.c and modified for M680x0. | |
11 | * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds | |
12 | * | |
13 | * This file is subject to the terms and conditions of the GNU General | |
14 | * Public License. See the file COPYING in the main directory of | |
15 | * this archive for more details. | |
16 | */ | |
17 | ||
18 | #include <linux/kernel.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/smp.h> | |
22 | #include <linux/smp_lock.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/ptrace.h> | |
25 | #include <linux/user.h> | |
26 | #include <linux/config.h> | |
27 | ||
28 | #include <asm/uaccess.h> | |
29 | #include <asm/page.h> | |
30 | #include <asm/pgtable.h> | |
31 | #include <asm/system.h> | |
32 | #include <asm/processor.h> | |
33 | #include <asm/signal.h> | |
34 | ||
35 | /* cpu depend functions */ | |
36 | extern long h8300_get_reg(struct task_struct *task, int regno); | |
37 | extern int h8300_put_reg(struct task_struct *task, int regno, unsigned long data); | |
38 | extern void h8300_disable_trace(struct task_struct *child); | |
39 | extern void h8300_enable_trace(struct task_struct *child); | |
40 | ||
41 | /* | |
42 | * does not yet catch signals sent when the child dies. | |
43 | * in exit.c or in signal.c. | |
44 | */ | |
45 | ||
46 | inline | |
47 | static int read_long(struct task_struct * tsk, unsigned long addr, | |
48 | unsigned long * result) | |
49 | { | |
50 | *result = *(unsigned long *)addr; | |
51 | return 0; | |
52 | } | |
53 | ||
54 | void ptrace_disable(struct task_struct *child) | |
55 | { | |
56 | h8300_disable_trace(child); | |
57 | } | |
58 | ||
59 | asmlinkage int sys_ptrace(long request, long pid, long addr, long data) | |
60 | { | |
61 | struct task_struct *child; | |
62 | int ret; | |
63 | ||
64 | lock_kernel(); | |
65 | ret = -EPERM; | |
66 | if (request == PTRACE_TRACEME) { | |
67 | /* are we already being traced? */ | |
68 | if (current->ptrace & PT_PTRACED) | |
69 | goto out; | |
70 | /* set the ptrace bit in the process flags. */ | |
71 | current->ptrace |= PT_PTRACED; | |
72 | ret = 0; | |
73 | goto out; | |
74 | } | |
75 | ret = -ESRCH; | |
76 | read_lock(&tasklist_lock); | |
77 | child = find_task_by_pid(pid); | |
78 | if (child) | |
79 | get_task_struct(child); | |
80 | read_unlock(&tasklist_lock); | |
81 | if (!child) | |
82 | goto out; | |
83 | ||
84 | ret = -EPERM; | |
85 | if (pid == 1) /* you may not mess with init */ | |
86 | goto out_tsk; | |
87 | ||
88 | if (request == PTRACE_ATTACH) { | |
89 | ret = ptrace_attach(child); | |
90 | goto out_tsk; | |
91 | } | |
92 | ret = ptrace_check_attach(child, request == PTRACE_KILL); | |
93 | if (ret < 0) | |
94 | goto out_tsk; | |
95 | ||
96 | switch (request) { | |
97 | case PTRACE_PEEKTEXT: /* read word at location addr. */ | |
98 | case PTRACE_PEEKDATA: { | |
99 | unsigned long tmp; | |
100 | ||
101 | ret = read_long(child, addr, &tmp); | |
102 | if (ret < 0) | |
103 | break ; | |
104 | ret = put_user(tmp, (unsigned long *) data); | |
105 | break ; | |
106 | } | |
107 | ||
108 | /* read the word at location addr in the USER area. */ | |
109 | case PTRACE_PEEKUSR: { | |
110 | unsigned long tmp = 0; | |
111 | ||
112 | if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) { | |
113 | ret = -EIO; | |
114 | break ; | |
115 | } | |
116 | ||
117 | ret = 0; /* Default return condition */ | |
118 | addr = addr >> 2; /* temporary hack. */ | |
119 | ||
120 | if (addr < H8300_REGS_NO) | |
121 | tmp = h8300_get_reg(child, addr); | |
122 | else { | |
123 | switch(addr) { | |
124 | case 49: | |
125 | tmp = child->mm->start_code; | |
126 | break ; | |
127 | case 50: | |
128 | tmp = child->mm->start_data; | |
129 | break ; | |
130 | case 51: | |
131 | tmp = child->mm->end_code; | |
132 | break ; | |
133 | case 52: | |
134 | tmp = child->mm->end_data; | |
135 | break ; | |
136 | default: | |
137 | ret = -EIO; | |
138 | } | |
139 | } | |
140 | if (!ret) | |
141 | ret = put_user(tmp,(unsigned long *) data); | |
142 | break ; | |
143 | } | |
144 | ||
145 | /* when I and D space are separate, this will have to be fixed. */ | |
146 | case PTRACE_POKETEXT: /* write the word at location addr. */ | |
147 | case PTRACE_POKEDATA: | |
148 | ret = 0; | |
149 | if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data)) | |
150 | break; | |
151 | ret = -EIO; | |
152 | break; | |
153 | ||
154 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ | |
155 | if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) { | |
156 | ret = -EIO; | |
157 | break ; | |
158 | } | |
159 | addr = addr >> 2; /* temporary hack. */ | |
160 | ||
161 | if (addr == PT_ORIG_ER0) { | |
162 | ret = -EIO; | |
163 | break ; | |
164 | } | |
165 | if (addr < H8300_REGS_NO) { | |
166 | ret = h8300_put_reg(child, addr, data); | |
167 | break ; | |
168 | } | |
169 | ret = -EIO; | |
170 | break ; | |
171 | case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ | |
172 | case PTRACE_CONT: { /* restart after signal. */ | |
173 | ret = -EIO; | |
174 | if ((unsigned long) data >= _NSIG) | |
175 | break ; | |
176 | if (request == PTRACE_SYSCALL) | |
177 | set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
178 | else | |
179 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
180 | child->exit_code = data; | |
181 | wake_up_process(child); | |
182 | /* make sure the single step bit is not set. */ | |
183 | h8300_disable_trace(child); | |
184 | ret = 0; | |
185 | } | |
186 | ||
187 | /* | |
188 | * make the child exit. Best I can do is send it a sigkill. | |
189 | * perhaps it should be put in the status that it wants to | |
190 | * exit. | |
191 | */ | |
192 | case PTRACE_KILL: { | |
193 | ||
194 | ret = 0; | |
195 | if (child->exit_state == EXIT_ZOMBIE) /* already dead */ | |
196 | break; | |
197 | child->exit_code = SIGKILL; | |
198 | h8300_disable_trace(child); | |
199 | wake_up_process(child); | |
200 | break; | |
201 | } | |
202 | ||
203 | case PTRACE_SINGLESTEP: { /* set the trap flag. */ | |
204 | ret = -EIO; | |
205 | if ((unsigned long) data > _NSIG) | |
206 | break; | |
207 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
208 | child->exit_code = data; | |
209 | h8300_enable_trace(child); | |
210 | wake_up_process(child); | |
211 | ret = 0; | |
212 | break; | |
213 | } | |
214 | ||
215 | case PTRACE_DETACH: /* detach a process that was attached. */ | |
216 | ret = ptrace_detach(child, data); | |
217 | break; | |
218 | ||
219 | case PTRACE_GETREGS: { /* Get all gp regs from the child. */ | |
220 | int i; | |
221 | unsigned long tmp; | |
222 | for (i = 0; i < H8300_REGS_NO; i++) { | |
223 | tmp = h8300_get_reg(child, i); | |
224 | if (put_user(tmp, (unsigned long *) data)) { | |
225 | ret = -EFAULT; | |
226 | break; | |
227 | } | |
228 | data += sizeof(long); | |
229 | } | |
230 | ret = 0; | |
231 | break; | |
232 | } | |
233 | ||
234 | case PTRACE_SETREGS: { /* Set all gp regs in the child. */ | |
235 | int i; | |
236 | unsigned long tmp; | |
237 | for (i = 0; i < H8300_REGS_NO; i++) { | |
238 | if (get_user(tmp, (unsigned long *) data)) { | |
239 | ret = -EFAULT; | |
240 | break; | |
241 | } | |
242 | h8300_put_reg(child, i, tmp); | |
243 | data += sizeof(long); | |
244 | } | |
245 | ret = 0; | |
246 | break; | |
247 | } | |
248 | ||
249 | default: | |
250 | ret = -EIO; | |
251 | break; | |
252 | } | |
253 | out_tsk: | |
254 | put_task_struct(child); | |
255 | out: | |
256 | unlock_kernel(); | |
257 | return ret; | |
258 | } | |
259 | ||
260 | asmlinkage void syscall_trace(void) | |
261 | { | |
262 | if (!test_thread_flag(TIF_SYSCALL_TRACE)) | |
263 | return; | |
264 | if (!(current->ptrace & PT_PTRACED)) | |
265 | return; | |
266 | ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) | |
267 | ? 0x80 : 0)); | |
268 | /* | |
269 | * this isn't the same as continuing with a signal, but it will do | |
270 | * for normal use. strace only continues with a signal if the | |
271 | * stopping signal is not SIGTRAP. -brl | |
272 | */ | |
273 | if (current->exit_code) { | |
274 | send_sig(current->exit_code, current, 1); | |
275 | current->exit_code = 0; | |
276 | } | |
277 | } |