]>
git.proxmox.com Git - mirror_ubuntu-kernels.git/blob - arch/um/kernel/tt/gdb.c
d284f69f04ee74b6df33ec09bab8202e3bb4733b
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 extern char *linux_prog
;
120 static void config_gdb_cb(void *arg
)
122 struct gdb_data
*data
= arg
;
127 if(debugger_pid
!= -1) exit_debugger_cb(NULL
);
128 if(!strncmp(data
->str
, "pid,", strlen("pid,"))){
129 data
->str
+= strlen("pid,");
130 pid
= strtoul(data
->str
, NULL
, 0);
131 task
= cpu_tasks
[0].task
;
132 debugger_pid
= attach_debugger(TASK_EXTERN_PID(task
), pid
, 0);
133 if(debugger_pid
!= -1){
140 debugger_pid
= start_debugger(linux_prog
, 0, 0, &debugger_fd
);
141 init_proxy(debugger_pid
, 0, 0);
144 int gdb_config(char *str
, char **error_out
)
146 struct gdb_data data
;
148 if(*str
++ != '=') return(-1);
150 initial_thread_cb(config_gdb_cb
, &data
);
154 void remove_gdb_cb(void *unused
)
156 exit_debugger_cb(NULL
);
159 int gdb_remove(int unused
, char **error_out
)
161 initial_thread_cb(remove_gdb_cb
, NULL
);
165 void signal_usr1(int sig
)
167 if(debugger_pid
!= -1){
168 printf("The debugger is already running\n");
171 debugger_pid
= start_debugger(linux_prog
, 0, 0, &debugger_fd
);
172 init_proxy(debugger_pid
, 0, 0);
175 int init_ptrace_proxy(int idle_pid
, int startup
, int stop
)
179 pid
= start_debugger(linux_prog
, startup
, stop
, &debugger_fd
);
180 status
= wait_for_stop(idle_pid
, SIGSTOP
, PTRACE_CONT
, NULL
);
185 init_proxy(pid
, 1, status
);
189 int attach_debugger(int idle_pid
, int pid
, int stop
)
195 printf("Failed to attach pid %d, errno = %d\n", pid
, -err
);
198 if(stop
) status
= wait_for_stop(idle_pid
, SIGSTOP
, PTRACE_CONT
, NULL
);
199 init_proxy(pid
, 1, status
);
203 #ifdef notdef /* Put this back in when it does something useful */
204 static int __init
uml_gdb_init_setup(char *line
, int *add
)
206 gdb_init
= uml_strdup(line
);
210 __uml_setup("gdb=", uml_gdb_init_setup
,
211 "gdb=<channel description>\n\n"
215 static int __init
uml_gdb_pid_setup(char *line
, int *add
)
217 gdb_pid
= strtoul(line
, NULL
, 0);
222 __uml_setup("gdb-pid=", uml_gdb_pid_setup
,
224 " gdb-pid is used to attach an external debugger to UML. This may be\n"
225 " an already-running gdb or a debugger-like process like strace.\n\n"
230 int debugger_signal(int status
, pid_t pid
){ return(0); }
231 void child_signal(pid_t pid
, int status
){ }
232 int init_ptrace_proxy(int idle_pid
, int startup
, int stop
)
234 printf("debug requested when CONFIG_PT_PROXY is off\n");
235 kill_child_dead(idle_pid
);
239 void signal_usr1(int sig
)
241 printf("debug requested when CONFIG_PT_PROXY is off\n");
244 int attach_debugger(int idle_pid
, int pid
, int stop
)
246 printf("attach_debugger called when CONFIG_PT_PROXY "
251 int config_gdb(char *str
)
261 int init_parent_proxy(int pid
)
266 void debugger_parent_signal(int status
, int pid
)
273 * Overrides for Emacs so that we follow Linus's tabbing style.
274 * Emacs will notice this stuff at the end of the file and automatically
275 * adjust the settings for this buffer only. This must remain at the end
277 * ---------------------------------------------------------------------------
279 * c-file-style: "linux"