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authorAndi Kleen <ak@suse.de>2006-08-30 13:37:08 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-08-30 19:05:15 -0400
commitc05991ed12fd71e539dd8de8f5663450cd0c934c (patch)
treee9a86dac1c2bf688d0683be97a5de32af59c175e /arch/x86_64
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>
Diffstat (limited to 'arch/x86_64')
-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 6f810424df44..aa8d8939abc1 100644
--- a/arch/x86_64/kernel/entry.S
+++ b/arch/x86_64/kernel/entry.S
@@ -973,6 +973,8 @@ ENTRY(kernel_thread)
973ENDPROC(kernel_thread) 973ENDPROC(kernel_thread)
974 974
975child_rip: 975child_rip:
976 pushq $0 # fake return address
977 CFI_STARTPROC
976 /* 978 /*
977 * Here we are in the child and the registers are set as they were 979 * Here we are in the child and the registers are set as they were
978 * at kernel_thread() invocation in the parent. 980 * at kernel_thread() invocation in the parent.
@@ -983,6 +985,7 @@ child_rip:
983 # exit 985 # exit
984 xorl %edi, %edi 986 xorl %edi, %edi
985 call do_exit 987 call do_exit
988 CFI_ENDPROC
986ENDPROC(child_rip) 989ENDPROC(child_rip)
987 990
988/* 991/*
diff --git a/arch/x86_64/kernel/head.S b/arch/x86_64/kernel/head.S
index 6df05e6034fa..c9739ca81d06 100644
--- a/arch/x86_64/kernel/head.S
+++ b/arch/x86_64/kernel/head.S
@@ -191,6 +191,7 @@ startup_64:
191 * jump 191 * jump
192 */ 192 */
193 movq initial_code(%rip),%rax 193 movq initial_code(%rip),%rax
194 pushq $0 # fake return address
194 jmp *%rax 195 jmp *%rax
195 196
196 /* SMP bootup changes these two */ 197 /* SMP bootup changes these two */