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Commit cf087343 authored Mar 18, 2009 by Heiko Carstens Committed by Martin Schwidefsky Mar 18, 2009

[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>

parent f55d6385

arch/s390/kernel/mcount.S

+4 −2

Original line number	Diff line number	Diff line
		@@ -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