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Commit 5d360a75 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
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[S390] ftrace: function tracer backend for s390 



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

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 98df67b3

arch/s390/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/s390/include/asm/ftrace.h

0 → 100644
+8 −0
Original line number Diff line number Diff line 
#ifndef _ASM_S390_FTRACE_H

#define _ASM_S390_FTRACE_H



#ifndef __ASSEMBLY__

extern void _mcount(void);

#endif



#endif /* _ASM_S390_FTRACE_H */

arch/s390/kernel/Makefile

+6 −0
Original line number Diff line number Diff line
@@ -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

arch/s390/kernel/mcount.S

0 → 100644
+56 −0
Original line number Diff line number Diff line 
/*

 * 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 */

arch/s390/kernel/s390_ksyms.c

+5 −0
Original line number Diff line number Diff line
@@ -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