Commit b957591f authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
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[PATCH] x86_64: Dump stack and prevent recursion on early fault 



Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent f1290ec9

arch/x86_64/kernel/head.S

+8 −0
Original line number Diff line number Diff line
@@ -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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