[patch 078/198] x86_64: Dump stack and prevent recursion on early fault

[akpm@osdl.org]

From: "Andi Kleen" <ak@suse.de>

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 25-akpm/arch/x86_64/kernel/head.S |    8 ++++++++
 1 files changed, 8 insertions(+)

diff -puN arch/x86_64/kernel/head.S~x86_64-dump-stack-and-prevent-recursion-on-early-fault arch/x86_64/kernel/head.S
--- 25/arch/x86_64/kernel/head.S~x86_64-dump-stack-and-prevent-recursion-on-early-fault	2005-04-12 03:21:22.009790904 -0700
+++ 25-akpm/arch/x86_64/kernel/head.S	2005-04-12 03:21:22.012790448 -0700
@@ -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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