31 lines
1.2 KiB
Markdown
31 lines
1.2 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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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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```sh
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make
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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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$ 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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```
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