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Minimal assembly example

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Toby Jaffey 2025-12-07 10:45:11 +00:00
parent 95333e06d8
commit d8a2faf732
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1
README.md
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@ -164,6 +164,7 @@ The uvm32 memory size is set at compile time with `-DUVM32_MEMORY_SIZE=X` (in by
* [host-parallel](host-parallel) parallel vm host running multiple vm instances concurrently, with baked in bytecode * [host-parallel](host-parallel) parallel vm host running multiple vm instances concurrently, with baked in bytecode
* [host-arduino](host-arduino) vm host as Arduino sketch (tested on Arduino Uno ATmega328P, uses 9950 bytes of flash/1254 bytes RAM) * [host-arduino](host-arduino) vm host as Arduino sketch (tested on Arduino Uno ATmega328P, uses 9950 bytes of flash/1254 bytes RAM)
* [apps/helloworld](apps/helloworld) C hello world program * [apps/helloworld](apps/helloworld) C hello world program
* [apps/hello-asm](apps/hello-asm) Minimal hello world assembly
* [apps/fib](apps/fib) C fibonacci series program (iterative and recursive) * [apps/fib](apps/fib) C fibonacci series program (iterative and recursive)
* [apps/sketch](apps/sketch) C Arduino/Wiring/Processing type program in `setup()` and `loop()` style * [apps/sketch](apps/sketch) C Arduino/Wiring/Processing type program in `setup()` and `loop()` style
* [apps/rust-hello](apps/rust-hello) Rust hello world program (note, the version of rust installed by brew on mac has issues, use the official rust installer from https://rust-lang.org/learn/get-started/) * [apps/rust-hello](apps/rust-hello) Rust hello world program (note, the version of rust installed by brew on mac has issues, use the official rust installer from https://rust-lang.org/learn/get-started/)

2
apps/Makefile
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@ -6,10 +6,12 @@ all:
(cd helloworld && make) (cd helloworld && make)
(cd zig-mandel && make) (cd zig-mandel && make)
(cd rust-hello && make) (cd rust-hello && make)
(cd hello-asm && make)
clean: clean:
(cd sketch && make clean) (cd sketch && make clean)
(cd helloworld && make clean) (cd helloworld && make clean)
(cd zig-mandel && make clean) (cd zig-mandel && make clean)
(cd rust-hello && make clean) (cd rust-hello && make clean)
(cd hello-asm && make clean)

27
apps/hello-asm/Makefile Normal file
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@ -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

9
apps/hello-asm/hello-asm.s Normal file
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@ -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"