GNU >> Assembly (RISC-V 64)
hello, world! (ecall)
參考資訊：
1. syscall
2. debian-mips-tutorial
3. risc-v-assembly-language-hello-world
main.s
.global _start
.data
msg: .asciz "hello, world!\n"
len = . - msg
.text
_start:
li a7, 64
li a0, 1
la a1, msg
li a2, len
ecall
li a7, 93
li a0, 0
ecall
| NR | syscall name | a7 | arg0(a0) | arg1(a1) | arg2(a2) |
|---|---|---|---|---|---|
| 64 | write | 4 | unsigned int fd | const char *buf | size_t count |
| 93 | exit | 1 | int error_code |
編譯、執行
$ riscv64-linux-gnu-gcc main.s -o main -static -nostdlib
$ qemu-riscv64 ./main
hello, world!