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Non-working c3 example

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crt0.S comments are a problem and asm format is different
This commit is contained in:
Toby Jaffey 2025-12-08 13:17:26 +00:00
parent c691c3ebdf
commit 3efe58ac3c
2 changed files with 53 additions and 0 deletions
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34
apps/c3-hello/Makefile Normal file
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@ -0,0 +1,34 @@
PROJECT:=c3-hello
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
SRCS_C3 := $(wildcard *.c3)
default: ${PROJECT}.bin
${PROJECT}.a: $(SRCS_C3)
c3c --use-stdlib=no --no-entry --target elf-riscv32 static-lib $(SRCS_C3)
crt0.o: ../crt0.s
${PREFIX}gcc ${CFLAGS} -c -o crt0.o ../crt0.s
#${PROJECT}.elf: ${PROJECT}.a crt0.o ../linker.ld
# ${PREFIX}ld ${LDFLAGS} -o ${PROJECT}.elf crt0.o hello.a
${PROJECT}.elf: ${PROJECT}.a ../linker.ld
${PREFIX}gcc -o ${PROJECT}.elf ${CFLAGS} ${LDFLAGS} ../crt0.s hello.a
${PROJECT}.bin: ${PROJECT}.elf
$(PREFIX)objcopy ${PROJECT}.elf -O binary ${PROJECT}.bin
clean:
rm -f *.o *.a ${PROJECT}.elf ${PROJECT}.bin

19
apps/c3-hello/hello.c3 Normal file
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//static uint32_t syscall(uint32_t id, uint32_t param) {
// register uint32_t a0 asm("a0") = (uint32_t)(param);
// register uint32_t a1 asm("a1");
// register uint32_t a7 asm("a7") = (uint32_t)(id);
//
// asm volatile (
// "ecall"
// : "=r"(a1) // output
// : "r"(a0), "r"(a7) // input
// : "memory"
// );
// return a1;
//}
fn void main() @export("main") {
int x = 42;
TBD
}