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[PATCH] x86_64: Add kernel thread stack frame termination for properly stopping stack unwinds.

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One open question: Should these added pushes perhaps be made
conditional upon CONFIG_STACK_UNWIND or CONFIG_UNWIND_INFO?
[AK: Not needed -- these are all very slow paths]

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen
2006-08-30 19:37:08 +02:00
committed by Linus Torvalds
parent 11012d419c
commit c05991ed12
2 changed files with 4 additions and 0 deletions
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3
arch/x86_64/kernel/entry.S
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@@ -973,6 +973,8 @@ ENTRY(kernel_thread)
ENDPROC(kernel_thread) ENDPROC(kernel_thread)
child_rip: child_rip:
pushq $0 # fake return address
CFI_STARTPROC
/* /*
* Here we are in the child and the registers are set as they were * Here we are in the child and the registers are set as they were
* at kernel_thread() invocation in the parent. * at kernel_thread() invocation in the parent.
@@ -983,6 +985,7 @@ child_rip:
# exit # exit
xorl %edi, %edi xorl %edi, %edi
call do_exit call do_exit
CFI_ENDPROC
ENDPROC(child_rip) ENDPROC(child_rip)
/* /*

1
arch/x86_64/kernel/head.S
View File

@@ -191,6 +191,7 @@ startup_64:
* jump * jump
*/ */
movq initial_code(%rip),%rax movq initial_code(%rip),%rax
pushq $0 # fake return address
jmp *%rax jmp *%rax
/* SMP bootup changes these two */ /* SMP bootup changes these two */