nasm - console 32bits

nasm - console 32bits

概述

看到一个nasm的例子(用nasm实现一个32bits控制台的程序架子)
学习一下

笔记

my_build.bat

@echo off
rem my_build.batrem env
rem NASM version 2.16.03 compiled on Apr 17 2024
rem GoLink.Exe Version 1.0.4.6  Copyright Jeremy Gordon 2002-2025cls
set path=C:\Program Files\NASM;D:\my_dev\my_study_re\src\nasm\NasmX86AndX64ProgrammingExamples\tools\Golink;%path%rem .bat默认是不支持中文的
rem echo full path name - %~f0
rem echo full path      - %~dp0
rem echo file name      - %~nx0
rem echo work path      - %cd%if "%1" == "build" (goto build
) else if "%1" == "clear" (goto clear
) else (goto usage
):usage
echo usage my_build.bat [option]
echo build - build asm to EXE
echo clear - clear trush on the project
goto end:build
echo build ...rem find file on work path
if exist "nasm_main.obj"  (del "nasm_main.obj" 
) nasm -f win32 nasm_main.asm -o nasm_main.obj
rem 用IDA打开.obj 已经可以看到实现逻辑了if exist "console_win32.exe"  (del "console_win32.exe" 
) rem 如果不指定要连接的dll, 会报错
golink /entry:Start /console kernel32.dll nasm_main.obj /fo console_win32.exeif exist "console_win32.exe"  (echo run console_win32.exe console_win32.exe 
)
goto end:clear
echo clear ...
if exist "nasm_main.obj"  (del "nasm_main.obj" 
) if exist "console_win32.exe"  (del "console_win32.exe" 
)
goto end:end
echo END
rem pause
call cmd

nasm_main.asm

; @file nasm_main.asm
; @brief 用NASM实现一个32bits控制台程序NULL EQU 0
STD_OUTPUT_HANDLE EQU -11; 调用的win32API不用特意修饰, 用API的原始名称就行, 不必搞成 _WriteFile@20
extern GetStdHandle
extern WriteFile
extern ExitProcessglobal Startsection .dataMessage db "Console Message 32", 0x0D, 0x0AMessageLength EQU $-Messagesection .bssStandardHandle resd 1Written resd 1section .text
Start:push STD_OUTPUT_HANDLEcall GetStdHandlemov dword[StandardHandle], EAXpush NULLpush Writtenpush MessageLengthpush Messagepush dword[StandardHandle]call WriteFilepush NULL
call ExitProcess

用VS2019写个程序，按照win32方式编译，比较一下。

#include <Windows.h>int main()
{const char* pMsg = "Console Message 64 ...";DWORD NumberOfBytesWritten = 0;system("pause");HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);WriteFile(hStdOut, pMsg, strlen(pMsg), &NumberOfBytesWritten, NULL);ExitProcess(0);
}

然后单步调试，断住后，转到反汇编。比较了一下手写的NASM代码，发现基本和反汇编的结果一致。
NASM的语法和VS2019反汇编出来的代码几乎一模一样。

; @file nasm_main.asm
; @brief 用NASM实现一个32bits控制台程序NULL EQU 0
STD_OUTPUT_HANDLE EQU -11; 调用的win32API不用特意修饰, 用API的原始名称就行, 不必搞成 _WriteFile@20
extern GetStdHandle
extern WriteFile
extern ExitProcessglobal Startsection .dataMessage db "Console Message 32", 0x0D, 0x0AMessageLength EQU $-Messagesection .bssStandardHandle resd 1Written resd 1section .text
Start:; HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);; 00DB17D4  mov         esi,esp  ; 00DB17D6  push        0FFFFFFF5h // !; 00DB17D8  call        dword ptr [__imp__GetStdHandle@4 (0DBB000h)] // !  ; 00DB17DE  cmp         esi,esp  ; 00DB17E0  call        __RTC_CheckEsp (0DB1235h)  ; 00DB17E5  mov         dword ptr [hStdOut],eax // !push STD_OUTPUT_HANDLEcall GetStdHandlemov dword[StandardHandle], EAX; WriteFile(hStdOut, pMsg, strlen(pMsg), &NumberOfBytesWritten, NULL);; 00DB17E8  mov         esi,esp  ; 00DB17EA  push        0 // !; 00DB17EC  lea         eax,[NumberOfBytesWritten]  ; 00DB17EF  push        eax // !; 00DB17F0  mov         ecx,dword ptr [pMsg]  ; 00DB17F3  push        ecx // !; 00DB17F4  call        _strlen (0DB1366h)  ; 00DB17F9  add         esp,4  ; 00DB17FC  push        eax // ! ; 00DB17FD  mov         edx,dword ptr [pMsg]  ; 00DB1800  push        edx // ! ; 00DB1801  mov         eax,dword ptr [hStdOut]  ; 00DB1804  push        eax // ! ; 00DB1805  call        dword ptr [__imp__WriteFile@20 (0DBB004h)] // !; 00DB180B  cmp         esi,esp  ; 00DB180D  call        __RTC_CheckEsp (0DB1235h)  push NULLpush Writtenpush MessageLengthpush Messagepush dword[StandardHandle]call WriteFile; ExitProcess(0);; 00DB1812  mov         esi,esp  ; 00DB1814  push        0 // !; 00DB1816  call        dword ptr [__imp__ExitProcess@4 (0DBB008h)] // !; 00DB181C  cmp         esi,esp  ; 00DB181E  call        __RTC_CheckEsp (0DB1235h)  push NULLcall ExitProcess

备注

从VS2019 c++ console工程的代码和NASM例子代码比较，可以得到一个提示。
如果用NASM手写代码不太熟练，可以从VS2019 c++代码的反汇编代码抽取汇编代码，直接就能用在NASM工程上。

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