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kgdb: Add module event hooks 

Allow gdb to auto load kernel modules when it is attached,
which makes it trivially easy to debug module init functions
or pre-set breakpoints in a kernel module that has not loaded yet.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
This commit is contained in:
Jason Wessel 2012-10-12 06:37:33 -05:00
parent a0d271cbfe
commit f30fed10c4
1 changed files with 18 additions and 0 deletions
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18
kernel/debug/debug_core.c
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@ -688,6 +688,22 @@ kgdb_handle_exception(int evector, int signo, int ecode, struct pt_regs *regs)
return kgdb_cpu_enter(ks, regs, DCPU_WANT_MASTER);
}
/*
* GDB places a breakpoint at this function to know dynamically
* loaded objects. It's not defined static so that only one instance with this
* name exists in the kernel.
*/
static int module_event(struct notifier_block *self, unsigned long val,
void *data)
{
return 0;
}
static struct notifier_block dbg_module_load_nb = {
.notifier_call = module_event,
};
int kgdb_nmicallback(int cpu, void *regs)
{
#ifdef CONFIG_SMP
@ -816,6 +832,7 @@ static void kgdb_register_callbacks(void)
kgdb_arch_init();
if (!dbg_is_early)
kgdb_arch_late();
register_module_notifier(&dbg_module_load_nb);
register_reboot_notifier(&dbg_reboot_notifier);
atomic_notifier_chain_register(&panic_notifier_list,
&kgdb_panic_event_nb);
@ -839,6 +856,7 @@ static void kgdb_unregister_callbacks(void)
if (kgdb_io_module_registered) {
kgdb_io_module_registered = 0;
unregister_reboot_notifier(&dbg_reboot_notifier);
unregister_module_notifier(&dbg_module_load_nb);
atomic_notifier_chain_unregister(&panic_notifier_list,
&kgdb_panic_event_nb);
kgdb_arch_exit();