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[PATCH] kdump: Use real pt_regs from exception

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Makes kexec_crashdump() take a pt_regs * as an argument.  This allows to
get exact register state at the point of the crash.  If we come from direct
panic assertion NULL will be passed and the current registers saved before
crashdump.

This hooks into two places:
die(): check the conditions under which we will panic when calling
do_exit and go there directly with the pt_regs that caused the fatal
fault.

die_nmi(): If we receive an NMI lockup while in the kernel use the
pt_regs and go directly to crash_kexec(). We're probably nested up badly
at this point so this might be the only chance to escape with proper
information.

Signed-off-by: Alexander Nyberg <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Alexander Nyberg 2005-06-25 14:58:26 -07:00 • committed by Linus Torvalds
commit 6e274d1443
11 changed files with 66 additions and 23 deletions
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13
kernel/kexec.c
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@ -18,6 +18,8 @@
#include <linux/reboot.h>
#include <linux/syscalls.h>
#include <linux/ioport.h>
#include <linux/hardirq.h>
#include <asm/page.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@ -32,6 +34,13 @@ struct resource crashk_res = {
.flags = IORESOURCE_BUSY | IORESOURCE_MEM
};
int kexec_should_crash(struct task_struct *p)
{
if (in_interrupt() || !p->pid || p->pid == 1 || panic_on_oops)
return 1;
return 0;
}
/*
* When kexec transitions to the new kernel there is a one-to-one
* mapping between physical and virtual addresses. On processors
@ -1010,7 +1019,7 @@ asmlinkage long compat_sys_kexec_load(unsigned long entry,
}
#endif
void crash_kexec(void)
void crash_kexec(struct pt_regs *regs)
{
struct kimage *image;
int locked;
@ -1028,7 +1037,7 @@ void crash_kexec(void)
if (!locked) {
image = xchg(&kexec_crash_image, NULL);
if (image) {
machine_crash_shutdown();
machine_crash_shutdown(regs);
machine_kexec(image);
}
xchg(&kexec_lock, 0);