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New debugging commands.

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This commit is contained in:
Geoffrey Challen 2017-02-09 09:49:42 -05:00
parent 8af1edae0e
commit e809face5f
1 changed files with 96 additions and 0 deletions
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96
kern/main/menu.c
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@ -35,6 +35,8 @@
#include <lib.h>
#include <uio.h>
#include <clock.h>
#include <mainbus.h>
#include <synch.h>
#include <thread.h>
#include <proc.h>
#include <vfs.h>
@ -237,6 +239,21 @@ cmd_sync(int nargs, char **args)
return 0;
}
/*
* Command for dropping to the debugger.
*/
static
int
cmd_debug(int nargs, char **args)
{
(void)nargs;
(void)args;
mainbus_debugger();
return 0;
}
/*
* Command for doing an intentional panic.
*/
@ -251,6 +268,81 @@ cmd_panic(int nargs, char **args)
return 0;
}
/*
* Subthread for intentially deadlocking.
*/
struct deadlock {
struct lock *lock1;
struct lock *lock2;
};
static
void
cmd_deadlockthread(void *ptr, unsigned long num)
{
struct deadlock *dl = ptr;
(void)num;
/* If it doesn't wedge right away, keep trying... */
while (1) {
lock_acquire(dl->lock2);
lock_acquire(dl->lock1);
kprintf("+");
lock_release(dl->lock1);
lock_release(dl->lock2);
}
}
/*
* Command for doing an intentional deadlock.
*/
static
int
cmd_deadlock(int nargs, char **args)
{
struct deadlock dl;
int result;
(void)nargs;
(void)args;
dl.lock1 = lock_create("deadlock1");
if (dl.lock1 == NULL) {
kprintf("lock_create failed\n");
return ENOMEM;
}
dl.lock2 = lock_create("deadlock2");
if (dl.lock2 == NULL) {
lock_destroy(dl.lock1);
kprintf("lock_create failed\n");
return ENOMEM;
}
result = thread_fork(args[0] /* thread name */,
NULL /* kernel thread */,
cmd_deadlockthread /* thread function */,
&dl /* thread arg */, 0 /* thread arg */);
if (result) {
kprintf("thread_fork failed: %s\n", strerror(result));
lock_release(dl.lock1);
lock_destroy(dl.lock2);
lock_destroy(dl.lock1);
return result;
}
/* If it doesn't wedge right away, keep trying... */
while (1) {
lock_acquire(dl.lock1);
lock_acquire(dl.lock2);
kprintf(".");
lock_release(dl.lock2);
lock_release(dl.lock1);
}
/* NOTREACHED */
return 0;
}
/*
* Command for shutting down.
*/
@ -441,7 +533,9 @@ static const char *opsmenu[] = {
"[cd] Change directory ",
"[pwd] Print current directory ",
"[sync] Sync filesystems ",
"[debug] Drop to debugger ",
"[panic] Intentional panic ",
"[deadlock] Intentional deadlock ",
"[q] Quit and shut down ",
NULL
};
@ -547,7 +641,9 @@ static struct {
{ "cd", cmd_chdir },
{ "pwd", cmd_pwd },
{ "sync", cmd_sync },
{ "debug", cmd_debug },
{ "panic", cmd_panic },
{ "deadlock", cmd_deadlock },
{ "q", cmd_quit },
{ "exit", cmd_quit },
{ "halt", cmd_quit },