MASM x86サンプル

はじめに

先ずCのアセンブリ出力を参考にしてx64版を作り、x86版を作る。

環境

• Windows 11 Pro (64bit)
• Visual Studio Community 2022

VC++

fig1.c

// cl /MD fig1.c
// cl /c /FAscu fig1.c
#include <windows.h>

const char msg[] = "hello, world\r\n";
#define len 14

static HANDLE hOut;

int main(void)
{
	hOut = GetStdHandle(STD_OUTPUT_HANDLE);
	WriteConsoleA(hOut, msg, len, NULL, NULL);
	ExitProcess(0);
}

MASM(x64)

dev2.bat

@echo off
set vcdir=C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.42.34433
path %path%;%vcdir%\bin\Hostx64\x64
set lib=C:\Program Files (x86)\Windows Kits\10\Lib\10.0.22621.0\um\x64
prompt $e[33m$p$g$e[m
cmd

fig2.asm

comment *
ml64 /c /Fl fig2.asm
link /subsystem:console /entry:_start fig2
*
includelib kernel32

extern ExitProcess :proc
extern GetStdHandle :proc
extern WriteConsoleA :proc

	.const
_msg	db	'hello, world',0dh,0ah
_len	equ	$ - _msg

	.data?
_hOut	dq	?

	.code
	public _start
_start:
	sub	rsp, 40

	mov	ecx, -11	; STD_OUTPUT_HANDLE
	call	GetStdHandle
	mov	_hOut, rax

	mov	qword ptr [rsp+32], 0
	xor	r9d, r9d
	mov	r8d, _len
	lea	rdx, offset _msg
	mov	rcx, _hOut
	call	WriteConsoleA

	xor	ecx, ecx
	call	ExitProcess

	end

MASM(x86)

dev3.bat

@echo off
set vcdir=C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.42.34433
path %path%;%vcdir%\bin\Hostx64\x86
set lib=C:\Program Files (x86)\Windows Kits\10\Lib\10.0.22621.0\um\x86
prompt $e[33m$p$g$e[m
cmd

fig3.asm

comment *
ml /c /Fl /Sa fig3.asm
link /subsystem:console fig3
*
includelib kernel32

	.model flat

ExitProcess proto stdcall, :dword
GetStdHandle proto stdcall, :dword
WriteConsoleA proto stdcall, :ptr, :ptr, :dword, :ptr, :ptr

	.const
_msg	db	'hello, world',0dh,0ah
_len	equ	$ - _msg

	.data?
_hOut	dd	?

	.code
	public _start
_start:
	invoke	GetStdHandle, -11	; STD_OUTPUT_HANDLE
	mov	_hOut, eax
	invoke	WriteConsoleA, _hOut, addr _msg, _len, 0, 0
	invoke	ExitProcess, 0

	end	_start

mlに/coffを付け、.386を指定すればMASM32でも作れる。