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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> | |
1da177e4 LT |
22 | #include <linux/errno.h> |
23 | #include <linux/ptrace.h> | |
24 | #include <linux/user.h> | |
7ed20e1a | 25 | #include <linux/signal.h> |
1da177e4 LT |
26 | |
27 | #include <asm/uaccess.h> | |
28 | #include <asm/page.h> | |
29 | #include <asm/pgtable.h> | |
30 | #include <asm/system.h> | |
31 | #include <asm/processor.h> | |
32 | #include <asm/signal.h> | |
33 | ||
34 | /* cpu depend functions */ | |
35 | extern long h8300_get_reg(struct task_struct *task, int regno); | |
36 | extern int h8300_put_reg(struct task_struct *task, int regno, unsigned long data); | |
37 | extern void h8300_disable_trace(struct task_struct *child); | |
38 | extern void h8300_enable_trace(struct task_struct *child); | |
39 | ||
40 | /* | |
41 | * does not yet catch signals sent when the child dies. | |
42 | * in exit.c or in signal.c. | |
43 | */ | |
44 | ||
45 | inline | |
46 | static int read_long(struct task_struct * tsk, unsigned long addr, | |
47 | unsigned long * result) | |
48 | { | |
49 | *result = *(unsigned long *)addr; | |
50 | return 0; | |
51 | } | |
52 | ||
53 | void ptrace_disable(struct task_struct *child) | |
54 | { | |
55 | h8300_disable_trace(child); | |
56 | } | |
57 | ||
481bed45 | 58 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 59 | { |
1da177e4 LT |
60 | int ret; |
61 | ||
1da177e4 LT |
62 | switch (request) { |
63 | case PTRACE_PEEKTEXT: /* read word at location addr. */ | |
64 | case PTRACE_PEEKDATA: { | |
65 | unsigned long tmp; | |
66 | ||
67 | ret = read_long(child, addr, &tmp); | |
68 | if (ret < 0) | |
69 | break ; | |
70 | ret = put_user(tmp, (unsigned long *) data); | |
71 | break ; | |
72 | } | |
73 | ||
74 | /* read the word at location addr in the USER area. */ | |
75 | case PTRACE_PEEKUSR: { | |
76 | unsigned long tmp = 0; | |
77 | ||
78 | if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) { | |
79 | ret = -EIO; | |
80 | break ; | |
81 | } | |
82 | ||
83 | ret = 0; /* Default return condition */ | |
84 | addr = addr >> 2; /* temporary hack. */ | |
85 | ||
86 | if (addr < H8300_REGS_NO) | |
87 | tmp = h8300_get_reg(child, addr); | |
88 | else { | |
89 | switch(addr) { | |
90 | case 49: | |
91 | tmp = child->mm->start_code; | |
92 | break ; | |
93 | case 50: | |
94 | tmp = child->mm->start_data; | |
95 | break ; | |
96 | case 51: | |
97 | tmp = child->mm->end_code; | |
98 | break ; | |
99 | case 52: | |
100 | tmp = child->mm->end_data; | |
101 | break ; | |
102 | default: | |
103 | ret = -EIO; | |
104 | } | |
105 | } | |
106 | if (!ret) | |
107 | ret = put_user(tmp,(unsigned long *) data); | |
108 | break ; | |
109 | } | |
110 | ||
111 | /* when I and D space are separate, this will have to be fixed. */ | |
112 | case PTRACE_POKETEXT: /* write the word at location addr. */ | |
113 | case PTRACE_POKEDATA: | |
f284ce72 | 114 | ret = generic_ptrace_pokedata(child, addr, data); |
1da177e4 LT |
115 | break; |
116 | ||
117 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ | |
118 | if ((addr & 3) || addr < 0 || addr >= sizeof(struct user)) { | |
119 | ret = -EIO; | |
120 | break ; | |
121 | } | |
122 | addr = addr >> 2; /* temporary hack. */ | |
123 | ||
124 | if (addr == PT_ORIG_ER0) { | |
125 | ret = -EIO; | |
126 | break ; | |
127 | } | |
128 | if (addr < H8300_REGS_NO) { | |
129 | ret = h8300_put_reg(child, addr, data); | |
130 | break ; | |
131 | } | |
132 | ret = -EIO; | |
133 | break ; | |
134 | case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ | |
135 | case PTRACE_CONT: { /* restart after signal. */ | |
136 | ret = -EIO; | |
7ed20e1a | 137 | if (!valid_signal(data)) |
1da177e4 LT |
138 | break ; |
139 | if (request == PTRACE_SYSCALL) | |
140 | set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
141 | else | |
142 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
143 | child->exit_code = data; | |
144 | wake_up_process(child); | |
145 | /* make sure the single step bit is not set. */ | |
146 | h8300_disable_trace(child); | |
147 | ret = 0; | |
148 | } | |
149 | ||
150 | /* | |
151 | * make the child exit. Best I can do is send it a sigkill. | |
152 | * perhaps it should be put in the status that it wants to | |
153 | * exit. | |
154 | */ | |
155 | case PTRACE_KILL: { | |
156 | ||
157 | ret = 0; | |
158 | if (child->exit_state == EXIT_ZOMBIE) /* already dead */ | |
159 | break; | |
160 | child->exit_code = SIGKILL; | |
161 | h8300_disable_trace(child); | |
162 | wake_up_process(child); | |
163 | break; | |
164 | } | |
165 | ||
166 | case PTRACE_SINGLESTEP: { /* set the trap flag. */ | |
167 | ret = -EIO; | |
7ed20e1a | 168 | if (!valid_signal(data)) |
1da177e4 LT |
169 | break; |
170 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
171 | child->exit_code = data; | |
172 | h8300_enable_trace(child); | |
173 | wake_up_process(child); | |
174 | ret = 0; | |
175 | break; | |
176 | } | |
177 | ||
178 | case PTRACE_DETACH: /* detach a process that was attached. */ | |
179 | ret = ptrace_detach(child, data); | |
180 | break; | |
181 | ||
182 | case PTRACE_GETREGS: { /* Get all gp regs from the child. */ | |
183 | int i; | |
184 | unsigned long tmp; | |
185 | for (i = 0; i < H8300_REGS_NO; i++) { | |
186 | tmp = h8300_get_reg(child, i); | |
187 | if (put_user(tmp, (unsigned long *) data)) { | |
188 | ret = -EFAULT; | |
189 | break; | |
190 | } | |
191 | data += sizeof(long); | |
192 | } | |
193 | ret = 0; | |
194 | break; | |
195 | } | |
196 | ||
197 | case PTRACE_SETREGS: { /* Set all gp regs in the child. */ | |
198 | int i; | |
199 | unsigned long tmp; | |
200 | for (i = 0; i < H8300_REGS_NO; i++) { | |
201 | if (get_user(tmp, (unsigned long *) data)) { | |
202 | ret = -EFAULT; | |
203 | break; | |
204 | } | |
205 | h8300_put_reg(child, i, tmp); | |
206 | data += sizeof(long); | |
207 | } | |
208 | ret = 0; | |
209 | break; | |
210 | } | |
211 | ||
212 | default: | |
213 | ret = -EIO; | |
214 | break; | |
215 | } | |
1da177e4 LT |
216 | return ret; |
217 | } | |
218 | ||
2fea299f | 219 | asmlinkage void do_syscall_trace(void) |
1da177e4 LT |
220 | { |
221 | if (!test_thread_flag(TIF_SYSCALL_TRACE)) | |
222 | return; | |
223 | if (!(current->ptrace & PT_PTRACED)) | |
224 | return; | |
225 | ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) | |
226 | ? 0x80 : 0)); | |
227 | /* | |
228 | * this isn't the same as continuing with a signal, but it will do | |
229 | * for normal use. strace only continues with a signal if the | |
230 | * stopping signal is not SIGTRAP. -brl | |
231 | */ | |
232 | if (current->exit_code) { | |
233 | send_sig(current->exit_code, current, 1); | |
234 | current->exit_code = 0; | |
235 | } | |
236 | } |