ARMとRISC-Vでも実行出来る様に
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57
README.md
57
README.md
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此れはlibcなしの「こんにちは、世界」のデモです。\
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Linux、FreeBSD、OpenBSD、NetBSD、及びmacOSで実行出来ますが、IntelやAMD CPUが必須に成ります。
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此れはlibcなしの「こんにちは、世界」のデモです。
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This is a libc-less "hello, world" demo.\
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It runs on Linux, FreeBSD, OpenBSD, NetBSD, and macOS, but requires an Intel or AMD CPU.
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This is a libc-less "hello, world" demo.
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## 対応 | Support
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| OS | CPU | 対応 | テスト済み |
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|---------|---------|------|------------|
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| Linux | x86-64 | 〇 | 〇 |
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| Linux | AArch64 | 〇 | 〇 |
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| Linux | RISC-V | 〇 | 〇 |
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| FreeBSD | x86-64 | 〇 | 〇 |
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| OpenBSD | x86-64 | ✕ | ✕ |
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| NetBSD | x86-64 | 〇 | ✕ |
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| macOS | x86-64 | 〇 | ✕ |
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| macOS | AArch64 | 〇 | ✕ |
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| Windows | x86-64 | ✕ | ✕ |
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| Windows | AArch64 | ✕ | ✕ |
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## 使い方 | How to use
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### x86-64
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```sh
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$ cc -nostdlib -static -masm=intel -o main main.c
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$ ls -thal main
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-rwxr-xr-x 1 suwako suwako 1.6K 12月 15 15:57 main
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-rwxr-xr-x 1 suwako suwako 1.5K 12月 15 15:57 main
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$ file main
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main: ELF 64-bit LSB executable, x86-64, version 1 (FreeBSD), statically linked, not stripped
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$ objdump -M intel -d main
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@@ -29,4 +44,36 @@ Disassembly of section .text:
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201213: 0f 05 syscall
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201215: 5d pop rbp
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201216: c3 ret
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$ ./main
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こんにちは、世界！
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```
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### AArch64、RISC-V
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```sh
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$ cc -nostdlib -static -o main main.c
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$ ls -thal main
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-rwxrwxr-x 1 suwako suwako 5.5K 12月 15 16:54 main
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$ file main
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main: ELF 64-bit LSB executable, UCB RISC-V, RVC, double-float ABI, version 1 (SYSV), statically linked, BuildID[sha1]=〇〇, not stripped
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$ objdump -d main
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main: file format elf64-littleriscv
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Disassembly of section .text:
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000000000001017c <_start>:
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1017c: 00001797 auipc a5,0x1
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10180: e8478793 addi a5,a5,-380 # 11000 <msg>
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10184: 04000893 li a7,64
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10188: 4505 li a0,1
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1018a: 85be mv a1,a5
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1018c: 4671 li a2,28
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1018e: 00000073 ecall
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10192: 05d00893 li a7,93
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10196: 4501 li a0,0
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10198: 00000073 ecall
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1019c: 0001 nop
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$ ./main
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こんにちは、世界！
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```
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68
main.c
68
main.c
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#if defined(__linux__)
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#define SYS_WRITE 1
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#define SYS_EXIT 60
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#if defined(__x86_64__)
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#define SYS_WRITE 1
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#define SYS_EXIT 60
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#define SYSCALL_INST "syscall"
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#elif defined(__aarch64__)
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#define SYS_WRITE 64
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#define SYS_EXIT 93
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#define SYSCALL_INST "svc #0"
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#elif defined(__riscv) && __riscv_xlen == 64
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#define SYS_WRITE 64
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#define SYS_EXIT 93
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#define SYSCALL_INST "ecall"
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#endif
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#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
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#define SYS_WRITE 4
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#define SYS_EXIT 1
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#define SYS_WRITE 4
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#define SYS_EXIT 1
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#define SYSCALL_INST "syscall"
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#elif defined(__APPLE__)
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#define SYS_WRITE 0x2000004
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#define SYS_EXIT 0x2000001
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#define SYS_WRITE 0x2000004
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#define SYS_EXIT 0x2000001
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#if defined(__x86_64__)
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#define SYSCALL_INST "syscall"
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#elif defined(__aarch64__)
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#define SYSCALL_INST "svc #0"
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#endif
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#endif
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char msg[] = "こんにちは、世界！\n";
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__attribute((naked))
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void _start() {
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asm volatile(
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#if defined(__x86_64__)
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".intel_syntax noprefix\n"
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"mov eax, %[sys_write]\n"
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"mov edi, 1\n"
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"mov rsi, offset msg\n"
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"mov edx, %[len]\n"
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"syscall\n"
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SYSCALL_INST "\n"
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"mov eax, %[sys_exit]\n"
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"xor edi, edi\n"
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"syscall\n"
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SYSCALL_INST "\n"
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#elif defined(__aarch64__)
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"mov x8, %[sys_write]\n"
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"mov x0, #1\n"
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"mov x1, %[msg]\n"
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"mov x2, %[len]\n"
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SYSCALL_INST "\n"
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".att_syntax prefix\n"
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"mov x8, %[sys_exit]\n"
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"mov x0, #0\n"
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SYSCALL_INST "\n"
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#elif defined(__riscv) && __riscv_xlen == 64
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"li a7, %[sys_write]\n"
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"li a0, 1\n"
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"mv a1, %[msg]\n"
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"li a2, %[len]\n"
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SYSCALL_INST "\n"
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"li a7, %[sys_exit]\n"
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"li a0, 0\n"
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SYSCALL_INST "\n"
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#endif
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:: [sys_write] "i" (SYS_WRITE),
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[sys_exit] "i" (SYS_EXIT),
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[len] "i" (sizeof(msg) - 1)
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: "rax", "rdi", "rsi", "rdx", "rcx", "r11"
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[len] "i" (sizeof(msg) - 1),
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[msg] "r" (msg)
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: "memory",
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#if defined(__x86_64__)
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"rax", "rdi", "rsi", "rdx" // x86-64
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#elif defined(__aarch64__)
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"x0", "x1", "x2", "x8" // AArch64
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#elif defined(__riscv) && __riscv_xlen == 64
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"a0", "a1", "a2", "a7" // RISC-V
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#endif
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);
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}
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