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[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>
This commit is contained in:
Andi Kleen 2005-04-16 15:25:00 -07:00 committed by Linus Torvalds
parent f1290ec93e
commit b957591fee
1 changed files with 8 additions and 0 deletions
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8
arch/x86_64/kernel/head.S
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@ -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"