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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) | |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include <stdio.h> | |
7 | #include <stdlib.h> | |
8 | #include <errno.h> | |
9 | #include <string.h> | |
10 | #include <signal.h> | |
11 | #include <sys/types.h> | |
12 | #include "ptrace_user.h" | |
13 | #include "uml-config.h" | |
14 | #include "kern_constants.h" | |
15 | #include "chan_user.h" | |
16 | #include "init.h" | |
17 | #include "user.h" | |
18 | #include "debug.h" | |
19 | #include "kern_util.h" | |
1da177e4 LT |
20 | #include "tt.h" |
21 | #include "sysdep/thread.h" | |
4fef0c10 | 22 | #include "os.h" |
1da177e4 LT |
23 | |
24 | extern int debugger_pid; | |
25 | extern int debugger_fd; | |
26 | extern int debugger_parent; | |
27 | ||
28 | int detach(int pid, int sig) | |
29 | { | |
30 | return(ptrace(PTRACE_DETACH, pid, 0, sig)); | |
31 | } | |
32 | ||
33 | int attach(int pid) | |
34 | { | |
35 | int err; | |
36 | ||
37 | err = ptrace(PTRACE_ATTACH, pid, 0, 0); | |
38 | if(err < 0) return(-errno); | |
39 | else return(err); | |
40 | } | |
41 | ||
42 | int cont(int pid) | |
43 | { | |
44 | return(ptrace(PTRACE_CONT, pid, 0, 0)); | |
45 | } | |
46 | ||
47 | #ifdef UML_CONFIG_PT_PROXY | |
48 | ||
49 | int debugger_signal(int status, pid_t pid) | |
50 | { | |
51 | return(debugger_proxy(status, pid)); | |
52 | } | |
53 | ||
54 | void child_signal(pid_t pid, int status) | |
55 | { | |
56 | child_proxy(pid, status); | |
57 | } | |
58 | ||
59 | static void gdb_announce(char *dev_name, int dev) | |
60 | { | |
61 | printf("gdb assigned device '%s'\n", dev_name); | |
62 | } | |
63 | ||
64 | static struct chan_opts opts = { | |
65 | .announce = gdb_announce, | |
66 | .xterm_title = "UML kernel debugger", | |
67 | .raw = 0, | |
68 | .tramp_stack = 0, | |
69 | .in_kernel = 0, | |
70 | }; | |
71 | ||
72 | /* Accessed by the tracing thread, which automatically serializes access */ | |
73 | static void *xterm_data; | |
74 | static int xterm_fd; | |
75 | ||
76 | extern void *xterm_init(char *, int, struct chan_opts *); | |
77 | extern int xterm_open(int, int, int, void *, char **); | |
78 | extern void xterm_close(int, void *); | |
79 | ||
80 | int open_gdb_chan(void) | |
81 | { | |
82 | char stack[UM_KERN_PAGE_SIZE], *dummy; | |
83 | ||
84 | opts.tramp_stack = (unsigned long) stack; | |
85 | xterm_data = xterm_init("", 0, &opts); | |
86 | xterm_fd = xterm_open(1, 1, 1, xterm_data, &dummy); | |
87 | return(xterm_fd); | |
88 | } | |
89 | ||
90 | static void exit_debugger_cb(void *unused) | |
91 | { | |
92 | if(debugger_pid != -1){ | |
93 | if(gdb_pid != -1){ | |
94 | fake_child_exit(); | |
95 | gdb_pid = -1; | |
96 | } | |
97 | else kill_child_dead(debugger_pid); | |
98 | debugger_pid = -1; | |
99 | if(debugger_parent != -1) | |
100 | detach(debugger_parent, SIGINT); | |
101 | } | |
102 | if(xterm_data != NULL) xterm_close(xterm_fd, xterm_data); | |
103 | } | |
104 | ||
105 | static void exit_debugger(void) | |
106 | { | |
107 | initial_thread_cb(exit_debugger_cb, NULL); | |
108 | } | |
109 | ||
110 | __uml_exitcall(exit_debugger); | |
111 | ||
112 | struct gdb_data { | |
113 | char *str; | |
114 | int err; | |
115 | }; | |
116 | ||
11100b1d JD |
117 | extern char *linux_prog; |
118 | ||
1da177e4 LT |
119 | static void config_gdb_cb(void *arg) |
120 | { | |
121 | struct gdb_data *data = arg; | |
122 | void *task; | |
123 | int pid; | |
124 | ||
125 | data->err = -1; | |
126 | if(debugger_pid != -1) exit_debugger_cb(NULL); | |
127 | if(!strncmp(data->str, "pid,", strlen("pid,"))){ | |
128 | data->str += strlen("pid,"); | |
129 | pid = strtoul(data->str, NULL, 0); | |
130 | task = cpu_tasks[0].task; | |
131 | debugger_pid = attach_debugger(TASK_EXTERN_PID(task), pid, 0); | |
132 | if(debugger_pid != -1){ | |
133 | data->err = 0; | |
134 | gdb_pid = pid; | |
135 | } | |
136 | return; | |
137 | } | |
138 | data->err = 0; | |
139 | debugger_pid = start_debugger(linux_prog, 0, 0, &debugger_fd); | |
140 | init_proxy(debugger_pid, 0, 0); | |
141 | } | |
142 | ||
f28169d2 | 143 | int gdb_config(char *str, char **error_out) |
1da177e4 LT |
144 | { |
145 | struct gdb_data data; | |
146 | ||
147 | if(*str++ != '=') return(-1); | |
148 | data.str = str; | |
149 | initial_thread_cb(config_gdb_cb, &data); | |
150 | return(data.err); | |
151 | } | |
152 | ||
153 | void remove_gdb_cb(void *unused) | |
154 | { | |
155 | exit_debugger_cb(NULL); | |
156 | } | |
157 | ||
f28169d2 | 158 | int gdb_remove(int unused, char **error_out) |
1da177e4 LT |
159 | { |
160 | initial_thread_cb(remove_gdb_cb, NULL); | |
29d56cfe | 161 | return 0; |
1da177e4 LT |
162 | } |
163 | ||
164 | void signal_usr1(int sig) | |
165 | { | |
166 | if(debugger_pid != -1){ | |
167 | printf("The debugger is already running\n"); | |
168 | return; | |
169 | } | |
170 | debugger_pid = start_debugger(linux_prog, 0, 0, &debugger_fd); | |
171 | init_proxy(debugger_pid, 0, 0); | |
172 | } | |
173 | ||
174 | int init_ptrace_proxy(int idle_pid, int startup, int stop) | |
175 | { | |
176 | int pid, status; | |
177 | ||
178 | pid = start_debugger(linux_prog, startup, stop, &debugger_fd); | |
179 | status = wait_for_stop(idle_pid, SIGSTOP, PTRACE_CONT, NULL); | |
180 | if(pid < 0){ | |
181 | cont(idle_pid); | |
182 | return(-1); | |
183 | } | |
184 | init_proxy(pid, 1, status); | |
185 | return(pid); | |
186 | } | |
187 | ||
188 | int attach_debugger(int idle_pid, int pid, int stop) | |
189 | { | |
190 | int status = 0, err; | |
191 | ||
192 | err = attach(pid); | |
193 | if(err < 0){ | |
194 | printf("Failed to attach pid %d, errno = %d\n", pid, -err); | |
195 | return(-1); | |
196 | } | |
197 | if(stop) status = wait_for_stop(idle_pid, SIGSTOP, PTRACE_CONT, NULL); | |
198 | init_proxy(pid, 1, status); | |
199 | return(pid); | |
200 | } | |
201 | ||
202 | #ifdef notdef /* Put this back in when it does something useful */ | |
203 | static int __init uml_gdb_init_setup(char *line, int *add) | |
204 | { | |
205 | gdb_init = uml_strdup(line); | |
206 | return 0; | |
207 | } | |
208 | ||
209 | __uml_setup("gdb=", uml_gdb_init_setup, | |
210 | "gdb=<channel description>\n\n" | |
211 | ); | |
212 | #endif | |
213 | ||
214 | static int __init uml_gdb_pid_setup(char *line, int *add) | |
215 | { | |
216 | gdb_pid = strtoul(line, NULL, 0); | |
217 | *add = 0; | |
218 | return 0; | |
219 | } | |
220 | ||
221 | __uml_setup("gdb-pid=", uml_gdb_pid_setup, | |
222 | "gdb-pid=<pid>\n" | |
223 | " gdb-pid is used to attach an external debugger to UML. This may be\n" | |
224 | " an already-running gdb or a debugger-like process like strace.\n\n" | |
225 | ); | |
226 | ||
227 | #else | |
228 | ||
229 | int debugger_signal(int status, pid_t pid){ return(0); } | |
230 | void child_signal(pid_t pid, int status){ } | |
231 | int init_ptrace_proxy(int idle_pid, int startup, int stop) | |
232 | { | |
233 | printf("debug requested when CONFIG_PT_PROXY is off\n"); | |
234 | kill_child_dead(idle_pid); | |
235 | exit(1); | |
236 | } | |
237 | ||
238 | void signal_usr1(int sig) | |
239 | { | |
240 | printf("debug requested when CONFIG_PT_PROXY is off\n"); | |
241 | } | |
242 | ||
243 | int attach_debugger(int idle_pid, int pid, int stop) | |
244 | { | |
245 | printf("attach_debugger called when CONFIG_PT_PROXY " | |
246 | "is off\n"); | |
247 | return(-1); | |
248 | } | |
249 | ||
250 | int config_gdb(char *str) | |
251 | { | |
252 | return(-1); | |
253 | } | |
254 | ||
255 | int remove_gdb(void) | |
256 | { | |
257 | return(-1); | |
258 | } | |
259 | ||
260 | int init_parent_proxy(int pid) | |
261 | { | |
262 | return(-1); | |
263 | } | |
264 | ||
265 | void debugger_parent_signal(int status, int pid) | |
266 | { | |
267 | } | |
268 | ||
269 | #endif | |
270 | ||
271 | /* | |
272 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
273 | * Emacs will notice this stuff at the end of the file and automatically | |
274 | * adjust the settings for this buffer only. This must remain at the end | |
275 | * of the file. | |
276 | * --------------------------------------------------------------------------- | |
277 | * Local variables: | |
278 | * c-file-style: "linux" | |
279 | * End: | |
280 | */ |