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[S390] ftrace: function tracer backend for s390

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This implements just the basic function tracer (_mcount) backend for s390.
The dynamic variant will come later.

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 2008-12-25 13:38:56 +01:00 committed by Martin Schwidefsky
parent 98df67b324
commit 5d360a75f8
5 changed files with 76 additions and 0 deletions
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1
arch/s390/Kconfig
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@ -74,6 +74,7 @@ mainmenu "Linux Kernel Configuration"
config S390
def_bool y
select USE_GENERIC_SMP_HELPERS if SMP
select HAVE_FUNCTION_TRACER
select HAVE_OPROFILE
select HAVE_KPROBES
select HAVE_KRETPROBES

8
arch/s390/include/asm/ftrace.h Normal file
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@ -0,0 +1,8 @@
#ifndef _ASM_S390_FTRACE_H
#define _ASM_S390_FTRACE_H
#ifndef __ASSEMBLY__
extern void _mcount(void);
#endif
#endif /* _ASM_S390_FTRACE_H */

6
arch/s390/kernel/Makefile
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@ -2,6 +2,11 @@
# Makefile for the linux kernel.
#
ifdef CONFIG_FUNCTION_TRACER
# Do not trace early boot code
CFLAGS_REMOVE_early.o = -pg
endif
#
# Passing null pointers is ok for smp code, since we access the lowcore here.
#
@ -34,6 +39,7 @@ obj-$(CONFIG_COMPAT) += compat_linux.o compat_signal.o \
obj-$(CONFIG_VIRT_TIMER) += vtime.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-$(CONFIG_KPROBES) += kprobes.o
obj-$(CONFIG_FUNCTION_TRACER) += mcount.o
# Kexec part
S390_KEXEC_OBJS := machine_kexec.o crash.o

56
arch/s390/kernel/mcount.S Normal file
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@ -0,0 +1,56 @@
/*
* Copyright IBM Corp. 2008
*
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
*
*/
#ifndef CONFIG_64BIT
.globl _mcount
_mcount:
stm %r0,%r5,8(%r15)
st %r14,56(%r15)
lr %r1,%r15
ahi %r15,-96
l %r3,100(%r15)
la %r2,0(%r14)
st %r1,0(%r15)
la %r3,0(%r3)
bras %r14,0f
.long ftrace_trace_function
0: l %r14,0(%r14)
l %r14,0(%r14)
basr %r14,%r14
ahi %r15,96
lm %r0,%r5,8(%r15)
l %r14,56(%r15)
br %r14
.globl ftrace_stub
ftrace_stub:
br %r14
#else /* CONFIG_64BIT */
.globl _mcount
_mcount:
stmg %r0,%r5,16(%r15)
stg %r14,112(%r15)
lgr %r1,%r15
aghi %r15,-160
stg %r1,0(%r15)
lgr %r2,%r14
lg %r3,168(%r15)
larl %r14,ftrace_trace_function
lg %r14,0(%r14)
basr %r14,%r14
aghi %r15,160
lmg %r0,%r5,16(%r15)
lg %r14,112(%r15)
br %r14
.globl ftrace_stub
ftrace_stub:
br %r14
#endif /* CONFIG_64BIT */

5
arch/s390/kernel/s390_ksyms.c
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@ -14,6 +14,7 @@
#include <asm/delay.h>
#include <asm/pgalloc.h>
#include <asm/setup.h>
#include <asm/ftrace.h>
#ifdef CONFIG_IP_MULTICAST
#include <net/arp.h>
#endif
@ -43,3 +44,7 @@ EXPORT_SYMBOL(csum_fold);
EXPORT_SYMBOL(console_mode);
EXPORT_SYMBOL(console_devno);
EXPORT_SYMBOL(console_irq);
#ifdef CONFIG_FUNCTION_TRACER
EXPORT_SYMBOL(_mcount);
#endif