Minimal assembly example

apps/Makefile

@@ -6,10 +6,12 @@ all:
 	(cd helloworld && make)
 	(cd zig-mandel && make)
 	(cd rust-hello && make)
+	(cd hello-asm && make)
 
 clean:
 	(cd sketch && make clean)
 	(cd helloworld && make clean)
 	(cd zig-mandel && make clean)
 	(cd rust-hello && make clean)
+	(cd hello-asm && make clean)
 

apps/hello-asm/Makefile

@@ -0,0 +1,27 @@
+PROJECT:=hello-asm
+
+DOCKER_IMAGE=riscv-dev
+DOCKER_CMD:=docker run --rm -v ${PWD}../../../:/data -w /data/apps/${PROJECT} ${DOCKER_IMAGE}
+PREFIX:=${DOCKER_CMD} riscv64-unknown-elf-
+CFLAGS+=-I../../common
+CFLAGS+=-fno-stack-protector
+CFLAGS+=-static-libgcc -fdata-sections -ffunction-sections
+CFLAGS+=-g -Os -march=rv32ima_zicsr -mabi=ilp32 -static
+LDFLAGS:= -T ../linker.ld -nostdlib -Wl,--gc-sections
+LIBS:= #-lgcc # needed for softfp
+
+SRCS=hello-asm.s
+
+all:
+	${PREFIX}gcc -o ${PROJECT}.elf ${CFLAGS} ${LDFLAGS} ${SRCS} ${LIBS}
+	$(PREFIX)objcopy ${PROJECT}.elf -O binary ${PROJECT}.bin
+
+disasm: all
+	$(PREFIX)objdump -S -d -f ${PROJECT}.elf
+
+test: all
+	../../host/host ${PWD}/${PROJECT}.bin
+
+clean:
+	rm -f ${PROJECT}.o ${PROJECT}.elf ${PROJECT}.bin
+

apps/hello-asm/hello-asm.s

@@ -0,0 +1,9 @@
+.section .initial_jump , "ax", %progbits
+.global _start
+_start:
+la     a5, str
+csrrw zero,0x13b,a5 # println
+csrwi 0x138,0 # halt
+str:
+.ascii "Hi"
+