2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
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"
19 #include "kern_util.h"
20 #include "user_util.h"
22 #include "sysdep/thread.h"
25 extern int debugger_pid
;
26 extern int debugger_fd
;
27 extern int debugger_parent
;
29 int detach(int pid
, int sig
)
31 return(ptrace(PTRACE_DETACH
, pid
, 0, sig
));
38 err
= ptrace(PTRACE_ATTACH
, pid
, 0, 0);
39 if(err
< 0) return(-errno
);
45 return(ptrace(PTRACE_CONT
, pid
, 0, 0));
48 #ifdef UML_CONFIG_PT_PROXY
50 int debugger_signal(int status
, pid_t pid
)
52 return(debugger_proxy(status
, pid
));
55 void child_signal(pid_t pid
, int status
)
57 child_proxy(pid
, status
);
60 static void gdb_announce(char *dev_name
, int dev
)
62 printf("gdb assigned device '%s'\n", dev_name
);
65 static struct chan_opts opts
= {
66 .announce
= gdb_announce
,
67 .xterm_title
= "UML kernel debugger",
73 /* Accessed by the tracing thread, which automatically serializes access */
74 static void *xterm_data
;
77 extern void *xterm_init(char *, int, struct chan_opts
*);
78 extern int xterm_open(int, int, int, void *, char **);
79 extern void xterm_close(int, void *);
81 int open_gdb_chan(void)
83 char stack
[UM_KERN_PAGE_SIZE
], *dummy
;
85 opts
.tramp_stack
= (unsigned long) stack
;
86 xterm_data
= xterm_init("", 0, &opts
);
87 xterm_fd
= xterm_open(1, 1, 1, xterm_data
, &dummy
);
91 static void exit_debugger_cb(void *unused
)
93 if(debugger_pid
!= -1){
98 else kill_child_dead(debugger_pid
);
100 if(debugger_parent
!= -1)
101 detach(debugger_parent
, SIGINT
);
103 if(xterm_data
!= NULL
) xterm_close(xterm_fd
, xterm_data
);
106 static void exit_debugger(void)
108 initial_thread_cb(exit_debugger_cb
, NULL
);
111 __uml_exitcall(exit_debugger
);
118 static void config_gdb_cb(void *arg
)
120 struct gdb_data
*data
= arg
;
125 if(debugger_pid
!= -1) exit_debugger_cb(NULL
);
126 if(!strncmp(data
->str
, "pid,", strlen("pid,"))){
127 data
->str
+= strlen("pid,");
128 pid
= strtoul(data
->str
, NULL
, 0);
129 task
= cpu_tasks
[0].task
;
130 debugger_pid
= attach_debugger(TASK_EXTERN_PID(task
), pid
, 0);
131 if(debugger_pid
!= -1){
138 debugger_pid
= start_debugger(linux_prog
, 0, 0, &debugger_fd
);
139 init_proxy(debugger_pid
, 0, 0);
142 int gdb_config(char *str
)
144 struct gdb_data data
;
146 if(*str
++ != '=') return(-1);
148 initial_thread_cb(config_gdb_cb
, &data
);
152 void remove_gdb_cb(void *unused
)
154 exit_debugger_cb(NULL
);
157 int gdb_remove(int unused
)
159 initial_thread_cb(remove_gdb_cb
, NULL
);
163 void signal_usr1(int sig
)
165 if(debugger_pid
!= -1){
166 printf("The debugger is already running\n");
169 debugger_pid
= start_debugger(linux_prog
, 0, 0, &debugger_fd
);
170 init_proxy(debugger_pid
, 0, 0);
173 int init_ptrace_proxy(int idle_pid
, int startup
, int stop
)
177 pid
= start_debugger(linux_prog
, startup
, stop
, &debugger_fd
);
178 status
= wait_for_stop(idle_pid
, SIGSTOP
, PTRACE_CONT
, NULL
);
183 init_proxy(pid
, 1, status
);
187 int attach_debugger(int idle_pid
, int pid
, int stop
)
193 printf("Failed to attach pid %d, errno = %d\n", pid
, -err
);
196 if(stop
) status
= wait_for_stop(idle_pid
, SIGSTOP
, PTRACE_CONT
, NULL
);
197 init_proxy(pid
, 1, status
);
201 #ifdef notdef /* Put this back in when it does something useful */
202 static int __init
uml_gdb_init_setup(char *line
, int *add
)
204 gdb_init
= uml_strdup(line
);
208 __uml_setup("gdb=", uml_gdb_init_setup
,
209 "gdb=<channel description>\n\n"
213 static int __init
uml_gdb_pid_setup(char *line
, int *add
)
215 gdb_pid
= strtoul(line
, NULL
, 0);
220 __uml_setup("gdb-pid=", uml_gdb_pid_setup
,
222 " gdb-pid is used to attach an external debugger to UML. This may be\n"
223 " an already-running gdb or a debugger-like process like strace.\n\n"
228 int debugger_signal(int status
, pid_t pid
){ return(0); }
229 void child_signal(pid_t pid
, int status
){ }
230 int init_ptrace_proxy(int idle_pid
, int startup
, int stop
)
232 printf("debug requested when CONFIG_PT_PROXY is off\n");
233 kill_child_dead(idle_pid
);
237 void signal_usr1(int sig
)
239 printf("debug requested when CONFIG_PT_PROXY is off\n");
242 int attach_debugger(int idle_pid
, int pid
, int stop
)
244 printf("attach_debugger called when CONFIG_PT_PROXY "
249 int config_gdb(char *str
)
259 int init_parent_proxy(int pid
)
264 void debugger_parent_signal(int status
, int pid
)
271 * Overrides for Emacs so that we follow Linus's tabbing style.
272 * Emacs will notice this stuff at the end of the file and automatically
273 * adjust the settings for this buffer only. This must remain at the end
275 * ---------------------------------------------------------------------------
277 * c-file-style: "linux"