diff options
Diffstat (limited to 'arch/um')
| -rw-r--r-- | arch/um/drivers/mconsole_kern.c | 52 | ||||
| -rw-r--r-- | arch/um/drivers/mconsole_user.c | 1 | ||||
| -rw-r--r-- | arch/um/include/mconsole.h | 1 | ||||
| -rw-r--r-- | arch/um/kernel/process_kern.c | 9 |
4 files changed, 62 insertions, 1 deletions
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c index c190c2414197..12c95368124a 100644 --- a/arch/um/drivers/mconsole_kern.c +++ b/arch/um/drivers/mconsole_kern.c @@ -32,6 +32,7 @@ #include "os.h" #include "umid.h" #include "irq_kern.h" +#include "choose-mode.h" static int do_unlink_socket(struct notifier_block *notifier, unsigned long what, void *data) @@ -276,6 +277,7 @@ void mconsole_proc(struct mc_request *req) go - continue the UML after a 'stop' \n\ log <string> - make UML enter <string> into the kernel log\n\ proc <file> - returns the contents of the UML's /proc/<file>\n\ + stack <pid> - returns the stack of the specified pid\n\ " void mconsole_help(struct mc_request *req) @@ -479,6 +481,56 @@ void mconsole_sysrq(struct mc_request *req) } #endif +/* Mconsole stack trace + * Added by Allan Graves, Jeff Dike + * Dumps a stacks registers to the linux console. + * Usage stack <pid>. + */ +void do_stack(struct mc_request *req) +{ + char *ptr = req->request.data; + int pid_requested= -1; + struct task_struct *from = NULL; + struct task_struct *to = NULL; + + /* Would be nice: + * 1) Send showregs output to mconsole. + * 2) Add a way to stack dump all pids. + */ + + ptr += strlen("stack"); + while(isspace(*ptr)) ptr++; + + /* Should really check for multiple pids or reject bad args here */ + /* What do the arguments in mconsole_reply mean? */ + if(sscanf(ptr, "%d", &pid_requested) == 0){ + mconsole_reply(req, "Please specify a pid", 1, 0); + return; + } + + from = current; + to = find_task_by_pid(pid_requested); + + if((to == NULL) || (pid_requested == 0)) { + mconsole_reply(req, "Couldn't find that pid", 1, 0); + return; + } + to->thread.saved_task = current; + + switch_to(from, to, from); + mconsole_reply(req, "Stack Dumped to console and message log", 0, 0); +} + +void mconsole_stack(struct mc_request *req) +{ + /* This command doesn't work in TT mode, so let's check and then + * get out of here + */ + CHOOSE_MODE(mconsole_reply(req, "Sorry, this doesn't work in TT mode", + 1, 0), + do_stack(req)); +} + /* Changed by mconsole_setup, which is __setup, and called before SMP is * active. */ diff --git a/arch/um/drivers/mconsole_user.c b/arch/um/drivers/mconsole_user.c index fe5afb13252c..a5b8aeade1c5 100644 --- a/arch/um/drivers/mconsole_user.c +++ b/arch/um/drivers/mconsole_user.c @@ -30,6 +30,7 @@ static struct mconsole_command commands[] = { { "go", mconsole_go, MCONSOLE_INTR }, { "log", mconsole_log, MCONSOLE_INTR }, { "proc", mconsole_proc, MCONSOLE_PROC }, + { "stack", mconsole_stack, MCONSOLE_INTR }, }; /* Initialized in mconsole_init, which is an initcall */ 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); extern void mconsole_go(struct mc_request *req); extern void mconsole_log(struct mc_request *req); extern void mconsole_proc(struct mc_request *req); +extern void mconsole_stack(struct mc_request *req); extern int mconsole_get_request(int fd, struct mc_request *req); extern int mconsole_notify(char *sock_name, int type, const void *data, diff --git a/arch/um/kernel/process_kern.c b/arch/um/kernel/process_kern.c index 1143f5e522b2..39cf568ccfaf 100644 --- a/arch/um/kernel/process_kern.c +++ b/arch/um/kernel/process_kern.c @@ -119,7 +119,14 @@ void *_switch_to(void *prev, void *next, void *last) to->thread.prev_sched = from; set_current(to); - CHOOSE_MODE_PROC(switch_to_tt, switch_to_skas, prev, next); + do { + current->thread.saved_task = NULL ; + CHOOSE_MODE_PROC(switch_to_tt, switch_to_skas, prev, next); + if(current->thread.saved_task) + show_regs(&(current->thread.regs)); + next= current->thread.saved_task; + prev= current; + } while(current->thread.saved_task); return(current->thread.prev_sched); |