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[S390] ftrace/mcount: fix kernel stack backchain 

With packed stack the backchain is at a different location.
Just use __SF_BACKCHAIN as an offset to store the backchain.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2009-03-18 13:27:34 +01:00 committed by Martin Schwidefsky
parent f55d63854e
commit cf08734380
1 changed files with 4 additions and 2 deletions
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6
arch/s390/kernel/mcount.S
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@ -5,6 +5,8 @@
*
*/
#include <asm/asm-offsets.h>
#ifndef CONFIG_64BIT
.globl _mcount
_mcount:
@ -14,7 +16,7 @@ _mcount:
ahi %r15,-96
l %r3,100(%r15)
la %r2,0(%r14)
st %r1,0(%r15)
st %r1,__SF_BACKCHAIN(%r15)
la %r3,0(%r3)
bras %r14,0f
.long ftrace_trace_function
@ -38,7 +40,7 @@ _mcount:
stg %r14,112(%r15)
lgr %r1,%r15
aghi %r15,-160
stg %r1,0(%r15)
stg %r1,__SF_BACKCHAIN(%r15)
lgr %r2,%r14
lg %r3,168(%r15)
larl %r14,ftrace_trace_function