x86 組合語言

Windows

C 程式: https://github.com/ccccourse/sp/blob/master/code/c/03-asmVm/gcc/00-gas/windows/winHello.c

#include <windows.h>

int main(void) {
    LPSTR text = "Hello, world!\n";
    DWORD charsWritten;
    HANDLE hStdout;

    hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
    WriteFile(hStdout, text, 14, &charsWritten, NULL);
    return 0;
}

編譯為組合語言，之後再組譯成執行檔。

PS D:\ccc\course\sp\code\c\03-asmVm\gcc\00-gas\windows> gcc -S winHello.c -o winHello.s
PS D:\ccc\course\sp\code\c\03-asmVm\gcc\00-gas\windows> gcc winHello.s -o winHello
PS D:\ccc\course\sp\code\c\03-asmVm\gcc\00-gas\windows> ./winHello
Hello, world!

組合語言檔案： https://github.com/ccccourse/sp/blob/master/code/c/03-asmVm/gcc/00-gas/windows/winHello.s

	.file	"winHello.c"
	.def	___main;	.scl	2;	.type	32;	.endef
	.section .rdata,"dr"
LC0:
	.ascii "Hello, world!\12\0"
	.text
	.globl	_main
	.def	_main;	.scl	2;	.type	32;	.endef
_main:
	leal	4(%esp), %ecx
	andl	$-16, %esp
	pushl	-4(%ecx)
	pushl	%ebp
	movl	%esp, %ebp
	pushl	%ecx
	subl	$52, %esp
	call	___main
	movl	$LC0, -12(%ebp)
	movl	$-11, (%esp)
	call	_GetStdHandle@4
	subl	$4, %esp
	movl	%eax, -16(%ebp)
	movl	$0, 16(%esp)
	leal	-20(%ebp), %eax
	movl	%eax, 12(%esp)
	movl	$14, 8(%esp)
	movl	-12(%ebp), %eax
	movl	%eax, 4(%esp)
	movl	-16(%ebp), %eax
	movl	%eax, (%esp)
	call	_WriteFile@20
	subl	$20, %esp
	movl	$0, %eax
	movl	-4(%ebp), %ecx
	leave
	leal	-4(%ecx), %esp
	ret
	.ident	"GCC: (tdm-1) 5.1.0"
	.def	_GetStdHandle@4;	.scl	2;	.type	32;	.endef
	.def	_WriteFile@20;	.scl	2;	.type	32;	.endef

Linux