提交 cf087343 编写于 作者: H Heiko Carstens 提交者: Martin Schwidefsky

[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: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
上级 f55d6385
......@@ -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
......
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