[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: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

5 files changed, 76 insertions, 0 deletions

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 90ba5d35cf32..e6efc1277b04 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -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
diff --git a/arch/s390/include/asm/ftrace.h b/arch/s390/include/asm/ftrace.h
new file mode 100644
index 000000000000..5a5bc75e19d4
--- /dev/null
+++ b/arch/s390/include/asm/ftrace.h
@@ -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 */
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile
index 235b9484a4dc..92730cc3cdb4 100644
--- a/arch/s390/kernel/Makefile
+++ b/arch/s390/kernel/Makefile
@@ -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
diff --git a/arch/s390/kernel/mcount.S b/arch/s390/kernel/mcount.S
new file mode 100644
index 000000000000..397d131a345f
--- /dev/null
+++ b/arch/s390/kernel/mcount.S
@@ -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 */
diff --git a/arch/s390/kernel/s390_ksyms.c b/arch/s390/kernel/s390_ksyms.c
index 48238a114ce9..46b90cb03707 100644
--- a/arch/s390/kernel/s390_ksyms.c
+++ b/arch/s390/kernel/s390_ksyms.c
@@ -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