寻找16位x86编译器 [英] Looking for 16-bit x86 compiler

问题描述

我正在编写一个嵌入式系统项目，遇到编译器被编程嵌入到Paradigm C ++ IDE中的问题。我希望能够自动化构建。

处理器是AMD186ES。我不是与操作系统 - 只是baremetal的东西。
我需要从C ++生成实模式16位8086机器代码。

我的Google搜寻表示G ++可以建立这类程式码。

我的问题是：

可以将g ++配置为构建此机器代码吗？

是否还有其他C ++编译器可以做到这一点？

解决方案

gnu as （一部分binutils和汇编器用于gcc），我已经成功地汇编了16位汇编代码，如下：

  as< file> 
 ld --oformat binary -Ttext 0x0 -e start< file> 
  

用我的汇编文件开头：

  .code16 
 .globl start 
 .text 
 start：
  

因为它的纯二进制省略了行，

  .globl start 
开始：
  

只会产生警告，即使平面二进制不需要入口点。

---

我学到了很难的方法;

  -Ttext 0x0 
  

是至关重要的，否则 .text 段被推出16位寻址范围之外（不要问我为什么）

我个人还在学习汇编，所以这只是我的方式，

如果您正在编写引导代码，则应该更改

  -Ttext 0x0 
  

到

  -Ttext 0x7c00 
  

这将通过 0x7c00 来抵消内存地址，因为引导代码通常加载在 0x7c00 。

I am working on an embedded systems project and have run into an issue of the compiler being programatically embedded in the Paradigm C++ IDE. I would like to be able to automate building.

The processor is the AMD186ES. I am not working with the OS - just baremetal stuff. I need to generate real-mode 16-bit 8086 machine code from C++.

My googling indicates that G++ can build such code.

My questions are:

Can g++ be configured to build this machine code?

Are there other C++ compilers that can do it as well?

解决方案

I am currently using gnu as (part of binutils and the assembler used for gcc) and I have successfully been assembling 16bit assembly code with the following:

as <file>
ld --oformat binary -Ttext 0x0 -e start <file>

with my assembly files starting out with:

.code16
.globl start
.text
start:

since its plain binary omitting the lines,

.globl start
start:

will simply yield an warning, even though flat binaries need no entry point.

---

something I learned the hard way;

-Ttext 0x0

is critical, otherwise the .text segment is pushed outside of 16bit addressing range (don't ask me why)

I am personally still learning assembly, so this is just my way, not necessarily the best way.

---

EDIT: If you are writing boot code, you should change

-Ttext 0x0

to

-Ttext 0x7c00

this will offset your memory addresses by 0x7c00 since boot code is usually loaded at 0x7c00 by the BIOS.

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