From b957591fee753101f289615abab1c54ff7b1d29d Mon Sep 17 00:00:00 2001
From: Andi Kleen <ak@suse.de>
Date: Sat, 16 Apr 2005 15:25:00 -0700
Subject: [PATCH] x86_64: Dump stack and prevent recursion on early fault

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 arch/x86_64/kernel/head.S | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'arch')

diff --git a/arch/x86_64/kernel/head.S b/arch/x86_64/kernel/head.S
index b6d8725c1f61..9bd2e7a4b81e 100644
--- a/arch/x86_64/kernel/head.S
+++ b/arch/x86_64/kernel/head.S
@@ -200,14 +200,22 @@ init_rsp:
 	.quad  init_thread_union+THREAD_SIZE-8
 
 ENTRY(early_idt_handler)
+	cmpl $2,early_recursion_flag(%rip)
+	jz  1f
+	incl early_recursion_flag(%rip)
 	xorl %eax,%eax
 	movq 8(%rsp),%rsi	# get rip
 	movq (%rsp),%rdx
 	movq %cr2,%rcx
 	leaq early_idt_msg(%rip),%rdi
 	call early_printk
+	cmpl $2,early_recursion_flag(%rip)
+	jz  1f
+	call dump_stack
 1:	hlt
 	jmp 1b
+early_recursion_flag:
+	.long 0
 
 early_idt_msg:
 	.asciz "PANIC: early exception rip %lx error %lx cr2 %lx\n"
-- 
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