Using arm-linux-gnueabi-gcc 4.7.3-1ubuntu1 on Ubuntu 13.04 to compiled
the m5 binary yields the error:
m5op_arm.S: Assembler messages:
m5op_arm.S:85: Error: selected processor does not support ARM mode `bxj lr'
For each of of the SIMPLE_OPs. Apparently, this compiler doesn't like the
interworking of these code types for the default arch. Adding -march=armv7-a
makes it compile. Another alternative that I found to work is replacing the
bxj lr instruction with mov pc, lr, but I don't know how that affects the
KVM stuff and if bxj is needed.
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>);
}
These ops allow gem5 ops to be called from within java programs like the following:
import jni.gem5Op;
public class HelloWorld {
public static void main(String[] args) {
gem5Op gem5 = new gem5Op();
System.out.println("Rpns0:" + gem5.rpns());
System.out.println("Rpns1:" + gem5.rpns());
}
static {
System.loadLibrary("gem5OpJni");
}
}
When building you need to make sure classpath include gem5OpJni.jar:
javac -classpath $CLASSPATH:/path/to/gem5OpJni.jar HelloWorld.java
and when running you need to make sure both the java and library path are set:
java -classpath $CLASSPATH:/path/to/gem5OpJni.jar -Djava.library.path=/path/to/libgem5OpJni.so HelloWorld
