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authorJeff Dike <jdike@addtoit.com>2005-09-16 22:27:46 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-17 14:49:59 -0400
commit3eddddcf239c89bbd3c50d1440001a3d384ed40a (patch)
tree8f41380260d8de20c14315bc3684c37e26632fe3 /arch/um/include
parentf6e34c6af6f18bd6c66bfb1c6a7c57068412aa73 (diff)
[PATCH] uml: breakpoint an arbitrary thread
This patch implements a stack trace for a thread, not unlike sysrq-t does. The advantage to this is that a break point can be placed on showreqs, so that upon showing the stack, you jump immediately into the debugger. While sysrq-t does the same thing, sysrq-t shows *all* threads stacks. It also doesn't work right now. In the future, I thought it might be acceptable to make this show all pids stacks, but perhaps leaving well enough alone and just using sysrq-t would be okay. For now, upon receiving the stack command, UML switches context to that thread, dumps its registers, and then switches context back to the original thread. Since UML compacts all threads into one of 4 host threads, this sort of mechanism could be expanded in the future to include other debugging helpers that sysrq does not cover. Note by jdike - The main benefit to this is that it brings an arbitrary thread back into context, where it can be examined by gdb. The fact that it dumps it stack is secondary. This provides the capability to examine a sleeping thread, which has existed in tt mode, but not in skas mode until now. Also, the other threads, that sysrq doesn't cover, can be gdb-ed directly anyway. Signed-off-by: Allan Graves<allan.graves@gmail.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/include')
-rw-r--r--arch/um/include/mconsole.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/um/include/mconsole.h b/arch/um/include/mconsole.h
index cfa368e045a5..b1b512f47035 100644
--- a/arch/um/include/mconsole.h
+++ b/arch/um/include/mconsole.h
@@ -81,6 +81,7 @@ extern void mconsole_stop(struct mc_request *req);
81extern void mconsole_go(struct mc_request *req); 81extern void mconsole_go(struct mc_request *req);
82extern void mconsole_log(struct mc_request *req); 82extern void mconsole_log(struct mc_request *req);
83extern void mconsole_proc(struct mc_request *req); 83extern void mconsole_proc(struct mc_request *req);
84extern void mconsole_stack(struct mc_request *req);
84 85
85extern int mconsole_get_request(int fd, struct mc_request *req); 86extern int mconsole_get_request(int fd, struct mc_request *req);
86extern int mconsole_notify(char *sock_name, int type, const void *data, 87extern int mconsole_notify(char *sock_name, int type, const void *data,