m5: Expose m5 pseudo-instructions to C/C++ via a static library

Updated the util/m5/Makefile.arm so that m5op_arm.S is used to create
a static library - libm5.a. Allowing users to insert m5
psuedo-instructions into their applications for fine-grained
checkpointing, switching cpus or dumping statistics. e.g.

#include <m5op.h>

void foo(){
	...
	m5_reset_stats(<delay>,<period>)
	m5_work_begin(<workid>,<threadid>);
	...
	m5_work_end(<workid>,<threadid>);
	m5_dump_stats(<delay>,<period>);
}

3 files changed, 30 insertions, 8 deletions

diff --git a/util/m5/Makefile.arm b/util/m5/Makefile.arm
index 0e05b028a..a90dc1011 100644
--- a/util/m5/Makefile.arm
+++ b/util/m5/Makefile.arm
@@ -46,6 +46,7 @@ endif
 CC=$(CROSS_COMPILE)gcc
 AS=$(CROSS_COMPILE)as
 LD=$(CROSS_COMPILE)ld
+AR=$(CROSS_COMPILE)ar
 
 JC=javac
 JH=javah
@@ -54,11 +55,13 @@ JR=jar
 #JDK_PATH=/path/to/jdk/version_number
 
 CFLAGS=-O2 -I $(JDK_PATH)/include/ -I $(JDK_PATH)/include/linux
+LDFLAGS=-L. -lm5
 
-OBJS=m5.o m5op_arm.o
+LIB_OBJS=m5op_arm.o
+OBJS=m5.o
 JNI_OBJS=m5op_arm.o jni_gem5Op.o
 
-all: m5
+all: libm5.a m5
 
 %.o: %.S
 	$(CC) $(CFLAGS) -o $@ -c $<
@@ -67,7 +70,10 @@ all: m5
 	$(CC)  $(CFLAGS) -o $@ -c $<
 
 m5: $(OBJS)
-	$(CC) -o $@ $(OBJS)
+	$(CC) -o $@ $(OBJS) $(LDFLAGS)
+
+libm5.a: $(LIB_OBJS)
+	$(AR) rcs $@ $<
 
 gem5OpJni: gem5OpJni.jar $(JNI_OBJS)
 	$(CC) --shared -o lib$@.so $(JNI_OBJS)
@@ -78,4 +84,4 @@ gem5OpJni.jar:
 	$(JR) cvf $@ jni/*.class
 
 clean:
-	rm -f *.o m5 libgemOpJni.so gem5OpJni.jar jni/*.class
+	rm -f *.o m5 libgemOpJni.so gem5OpJni.jar jni/*.class libm5.a
diff --git a/util/m5/Makefile.thumb b/util/m5/Makefile.thumb
index 9848f5d93..5e34e77af 100644
--- a/util/m5/Makefile.thumb
+++ b/util/m5/Makefile.thumb
@@ -47,12 +47,17 @@ endif
 CC=$(CROSS_COMPILE)gcc
 AS=$(CROSS_COMPILE)as
 LD=$(CROSS_COMPILE)ld
+AR=$(CROSS_COMPILE)ar
 
 #CFLAGS=-O2 -march=armv7 -mthumb 
 CFLAGS=-O2 -mthumb 
-OBJS=m5.o m5op_arm.o
+LDFLAGS=-L. -lm5
 
-all: m5
+OBJS=m5.o
+LIB_OBJS=m5op_arm.o
+
+
+all: libm5.a m5
 
 %.o: %.S
 	$(CC) $(CFLAGS) -o $@ -c $<
@@ -61,7 +66,11 @@ all: m5
 	$(CC)  $(CFLAGS) -o $@ -c $<
 
 m5: $(OBJS)
-	$(CC) -o $@ -march=armv7 -mthumb $(OBJS)
+	$(CC) -o $@ -march=armv7 -mthumb $(OBJS) $(LDFLAGS)
+
+libm5.a: $(LIB_OBJS)
+	$(AR) rcs $@ $<
+
 
 clean:
-	rm -f *.o m5
+	rm -f *.o m5 libm5.a
diff --git a/util/m5/m5op.h b/util/m5/m5op.h
index 4e1d0b638..9e693258e 100644
--- a/util/m5/m5op.h
+++ b/util/m5/m5op.h
@@ -32,6 +32,10 @@
 #ifndef __M5OP_H__
 #define __M5OP_H__
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #include <stdint.h>
 
 void arm(uint64_t address);
@@ -79,4 +83,7 @@ uint64_t m5a_getid(void);
 #define M5_AN_FL_LINK   0x10
 #define M5_AN_FL_RESET  0x20
 
+#ifdef __cplusplus
+}
+#endif
 #endif // __M5OP_H__