Tested assembly language file for the pause example

.gitignore

@@ -62,6 +62,7 @@ examples/fp/fpcalc/fpcalc
 examples/C/inline/inline
 examples/C/sum_mixed/sum_mixed
 examples/asm/trap/trap
+examples/asm/etc/pause
 src/fma/fma16_testgen
 linux/devicetree/debug/*
 !linux/devicetree/debug/dump-dts.sh

examples/asm/etc/Makefile

@@ -0,0 +1,11 @@
+TARGET = pause
+
+$(TARGET).objdump: $(TARGET)
+	riscv64-unknown-elf-objdump -D $(TARGET) > $(TARGET).objdump
+    
+pause: pause.S Makefile
+	riscv64-unknown-elf-gcc -o pause -march=rv32ia_zihintpause -mabi=ilp32 -mcmodel=medany \
+	    -nostartfiles -T../../link/link.ld  pause.S
+
+clean:
+	rm -f $(TARGET) $(TARGET).objdump

examples/asm/etc/pause.S

@@ -0,0 +1,25 @@
+.section .text.init
+.globl rvtest_entry_point
+rvtest_entry_point:
+
+
+la a0, lock
+
+spinlock:				# address of lock is in a0
+	lr.w t0, (a0)		# read the lock
+	bnez t0, retry	    # spin until free
+	li   t1, 1          
+	sc.w t0, t1, (a0)	# try to write a 1 to take lock
+	bnez t0, retry	    # spin until successful
+	ret				    # got the lock!
+retry:				    # no lock yet
+	pause				# pause hint to reduce spin power
+	j spinlock			# try again
+
+
+self_loop:
+    j self_loop
+
+.data
+lock:   
+    .word 1