80 lines
2.7 KiB
Markdown
80 lines
2.7 KiB
Markdown
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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## 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 | ✕ | 〇 |
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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 1.5K 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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main: file format elf64-x86-64
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Disassembly of section .text:
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00000000002011f0 <_start>:
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2011f0: 55 push rbp
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2011f1: 48 89 e5 mov rbp, rsp
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2011f4: b8 04 00 00 00 mov eax, 0x4
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2011f9: bf 01 00 00 00 mov edi, 0x1
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2011fe: 48 c7 c6 20 22 20 00 mov rsi, 0x202220
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201205: ba 1c 00 00 00 mov edx, 0x1c
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20120a: 0f 05 syscall
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20120c: b8 01 00 00 00 mov eax, 0x1
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201211: 31 ff xor edi, edi
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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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