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authorAndi Kleen <ak@suse.de>2006-08-30 19:37:08 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-08-30 16:05:15 -0700
commitc05991ed12fd71e539dd8de8f5663450cd0c934c (patch)
treee9a86dac1c2bf688d0683be97a5de32af59c175e
parent11012d419cfc0e0f78ca356aca03674217910124 (diff)
[PATCH] x86_64: Add kernel thread stack frame termination for properly stopping stack unwinds.
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>
-rw-r--r--arch/x86_64/kernel/entry.S3
-rw-r--r--arch/x86_64/kernel/head.S1
2 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S
index 6f810424df4..aa8d8939abc 100644
--- a/arch/x86_64/kernel/entry.S
+++ b/arch/x86_64/kernel/entry.S
@@ -973,6 +973,8 @@ ENTRY(kernel_thread)
ENDPROC(kernel_thread)
child_rip:
+ pushq $0 # fake return address
+ CFI_STARTPROC
/*
* Here we are in the child and the registers are set as they were
* at kernel_thread() invocation in the parent.
@@ -983,6 +985,7 @@ child_rip:
# exit
xorl %edi, %edi
call do_exit
+ CFI_ENDPROC
ENDPROC(child_rip)
/*
diff --git a/arch/x86_64/kernel/head.S b/arch/x86_64/kernel/head.S
index 6df05e6034f..c9739ca81d0 100644
--- a/arch/x86_64/kernel/head.S
+++ b/arch/x86_64/kernel/head.S
@@ -191,6 +191,7 @@ startup_64:
* jump
*/
movq initial_code(%rip),%rax
+ pushq $0 # fake return address
jmp *%rax
/* SMP bootup changes these two */