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authorAndi Kleen <ak@suse.de>2005-04-16 15:25:00 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:25:00 -0700
commitb957591fee753101f289615abab1c54ff7b1d29d (patch)
tree369eccf7e24a263627977dd7a0986e779449c30d /arch/x86_64/kernel/head.S
parentf1290ec93e5da4a748ca4758a00b580283e06596 (diff)
[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>
Diffstat (limited to 'arch/x86_64/kernel/head.S')
-rw-r--r--arch/x86_64/kernel/head.S8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/head.S b/arch/x86_64/kernel/head.S
index b6d8725c1f6..9bd2e7a4b81 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"