void die(struct pt_regs *regs, const char *str)
{
static int die_counter;
oops_enter();
lgr_info_log();
debug_stop_all();
console_verbose();
spin_lock_irq(&die_lock);
bust_spinlocks(1);
printk("%s: %04x [#%d] ", str, regs->int_code & 0xffff, ++die_counter);
#ifdef CONFIG_PREEMPT
printk("PREEMPT ");
#endif
#ifdef CONFIG_SMP
printk("SMP ");
#endif
#ifdef CONFIG_DEBUG_PAGEALLOC
printk("DEBUG_PAGEALLOC");
#endif
printk("\n");
notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
print_modules();
show_regs(regs);
bust_spinlocks(0);
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
spin_unlock_irq(&die_lock);
if (in_interrupt())
panic("Fatal exception in interrupt");
if (panic_on_oops)
panic("Fatal exception: panic_on_oops");
oops_exit();
do_exit(SIGSEGV);
}
/*
* Start kdump: create a LGR log entry, store status of all CPUs and
* branch to __do_machine_kdump.
*/
static noinline void __machine_kdump(void *image)
{
int this_cpu, cpu;
lgr_info_log();
/* Get status of the other CPUs */
this_cpu = smp_find_processor_id(stap());
for_each_online_cpu(cpu) {
if (cpu == this_cpu)
continue;
if (smp_store_status(cpu))
continue;
}
/* Store status of the boot CPU */
if (MACHINE_HAS_VX)
save_vx_regs((void *) &S390_lowcore.vector_save_area);
/*
* To create a good backchain for this CPU in the dump store_status
* is passed the address of a function. The address is saved into
* the PSW save area of the boot CPU and the function is invoked as
* a tail call of store_status. The backchain in the dump will look
* like this:
* restart_int_handler -> __machine_kexec -> __do_machine_kdump
* The call to store_status() will not return.
*/
store_status(__do_machine_kdump, image);
}
static void __machine_kexec(void *data)
{
struct kimage *image = data;
pfault_fini();
tracing_off();
debug_locks_off();
if (image->type == KEXEC_TYPE_CRASH) {
lgr_info_log();
s390_reset_system(__do_machine_kdump, data);
} else {
s390_reset_system(__do_machine_kexec, data);
}
disabled_wait((unsigned long) __builtin_return_address(0));
}
/*
* Reset system and call either kdump or normal kexec
*/
static void __machine_kexec(void *data)
{
__arch_local_irq_stosm(0x04); /* enable DAT */
pfault_fini();
tracing_off();
debug_locks_off();
#ifdef CONFIG_CRASH_DUMP
if (((struct kimage *) data)->type == KEXEC_TYPE_CRASH) {
lgr_info_log();
s390_reset_system(setup_regs, __do_machine_kdump, data);
} else
#endif
s390_reset_system(NULL, __do_machine_kexec, data);
disabled_wait((unsigned long) __builtin_return_address(0));
}
/*
* Reset system and call either kdump or normal kexec
*/
void machine_kexec(struct kimage *image)
{
if (image->type == KEXEC_TYPE_CRASH && !kdump_csum_valid(image))
return;
smp_send_stop();
pfault_fini();
tracing_off();
debug_locks_off();
if (image->type == KEXEC_TYPE_CRASH) {
lgr_info_log();
s390_reset_system(__do_machine_kdump, image);
} else {
s390_reset_system(__do_machine_kexec, image);
}
disabled_wait((unsigned long) __builtin_return_address(0));
}
