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是否有任何工具可以将 PIC 16F877A 的 ASM 转换为 C

发布于 2024-09-02 09:26:23 字数 69 浏览 8 评论 0原文

我想将 ASM 文件转换为 C 程序。有没有可用的工具。我的目的是将PIC 16F877A程序的汇编程序转换为C程序...

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顾挽 2024-09-09 09:26:23

自动将汇编语言转换为C语言的工具是一种反编译器。
有多个针对 x86 汇编语言的反编译器。
虽然我没有使用过，但我听说 IDA（交互式反汇编器）具有反编译为 C 的选项，并且支持 Microchip PIC 汇编语言。

了解 PIC 汇编的人可以很好地手动将代码从 PIC 汇编移植到 C。
第一步是将“.asm”文件的内容复制到“.c”文件并用“asm”关键字包装它。使用 SDCC 语法，生成的文件如下所示

// the_program.c
__asm  
    ; some assembler code
    goto $0056
__endasm;

：能够编译该“.c”文件并使用“diff”来确认它编译为相同的可执行文件。
有时，人们可以将汇编程序片段翻译成 C 函数，然后编译成相同的可执行文件（使用“diff”进行比较）。
下一步通常看起来像这样

// the_program.c
__asm  
    ; some assembler code
__endasm; 
int main(void){
    for(;;){ // forever
    __asm  
        ; more assembler code
    __endasm;
    };
}
__asm  
    ; yet more assembler code
    goto $0056
__endasm;

从这里开始，您可以采取两条路径：

如果您想向这个预先存在的汇编应用程序添加一些 C 代码，并在相同 16F877A 处理器上运行它，不必费心尝试翻译大段汇编语言——将新代码粘贴到普通的 C 子例程中并从主 for() 循环中调用它。随着时间的推移，为了修复错误和添加功能，您可能会发现一次从 asm 翻译几行到 C 很方便，也许有一天它会完全转换为纯 C。但没有理由这样做一下子就完成了。
如果您想将此应用程序移植到某个完全不同的处理器，最好注释掉“.c”文件中的所有汇编语言，并添加一个简单的闪烁主循环程序。使用汇编语言作为一般指导，一次编写一两个 C 函数，每次添加后在新处理器上运行和测试程序，直到拥有足够的功能。

A tool that automatically converts assembly to C is a kind of decompiler.
There are several decompilers for x86 assembly language.
While I haven't used it, I hear that IDA, the Interactive Disassembler, has a decompile-to-C option, and supports Microchip PIC assembly language.

People who know PIC assembly can do a pretty good job manually porting code from PIC assembly to C.
The first step is copying the contents of the ".asm" file to a ".c" file and wrapping it with the "asm" keyword. With SDCC syntax, the resulting file looks something like:

// the_program.c
__asm  
    ; some assembler code
    goto $0056
__endasm;

You should be able to compile that ".c" file and use "diff" to confirm that it compiles to an identical executable.
A person can sometimes translate pieces of assembler into C functions that compile to identical executable (using "diff" to compare).
The next step often looks something like

// the_program.c
__asm  
    ; some assembler code
__endasm; 
int main(void){
    for(;;){ // forever
    __asm  
        ; more assembler code
    __endasm;
    };
}
__asm  
    ; yet more assembler code
    goto $0056
__endasm;

From here, there are two paths you can take:

If you want to add some C code to this pre-existing assembly application, and run it on the same 16F877A processor, don't bother trying to translate the big blobs of assembly language -- stick your new code in normal C subroutines and call it from the main for() loop. As time goes on, in order to fix bugs and add features, you may find it convenient to translate a few lines at a time from asm to C, and perhaps someday it will be entirely converted to pure C. But there's no reason to do it all at once.
If you want to port this application to some completely different processor, it's probably best to comment out all the assembly language in the ".c" file, and add a simple blinky-light main loop program. Use the assembly language as general guidance to write one or two C functions at a time, running and testing the program on the new processor after each addition, until you have adequate functionality.

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