如何引用的启动的一个用户定义段在Visual Studio中，项目？ [英] How to refer to the start-of a user-defined segment in a Visual Studio-project?

问题描述

我竭力要转换GNU工具链的使用ld链接的C程序，
使它编译为视觉工作室（2005年）项目。
该方案提出。资料-符号在不同的段，期间
段之间的初始化阶段它复制数据。指针到
启动和段的端部是在LD链接脚本定义。

我知道如何变量定位到不同的用户定义
段，但我还没有能够弄清楚如何定义连接常量
如_start_of_my_segment或者如果有类​​似的连接体的东西
脚本在Visual Studio。

我的目标是能够与，prefferably编译程序
没有修改的源 - code，它是指在定义链接器
符号，但在Visual Studio中的数据我自己的自定义布局
项目。

下面是一些例子C- code，说明我想要什么
做和（简装，可能是语法不正确的）版本
化妆脚本使用gcc / ld进行链接时使用。

任何提示将不胜AP preciated！

 的#pragma data_seg（MY_DATA_FOO）
的#pragma data_seg（MY_DATA_BAR）
的#pragma评论（连接/部分：MY_DATA_BAR，R）__declspec（分配（MY_DATA_FOO））INT foo1;
__declspec（分配（MY_DATA_FOO））INT foo2的;__declspec（分配（MY_DATA_BAR））INT BAR1 = 1;
__declspec（分配（MY_DATA_BAR））INT BAR2 = 2;的#pragma data_seg（）
无效测试（）{
    foo1 = BAR1;
    foo2的= BAR2;    //我宁愿做这个作为
    //的extern unsigned int类型__start_of_MY_DATA_FOO;
    //的extern unsigned int类型__start_of_MY_DATA_BAR;
    //的extern unsigned int类型__size_of_MY_DATA_BAR;
    //的memcpy（__ start_of_MY_DATA_FOO，_start_of_MY_DATA_BAR，_size_of_MY_DATA_BAR）;
}
 

伪链接脚本（这将是对Visual Studio中的等价

  MEMORY
{
  富：有机= 0x1000中，LEN = 0x100处
  条：组织=为0x2000，LEN = 0x100处
}截面
{
    组：
    {
        MY_DATA_FOO：{}
        __start_of_MY_DATA_FOO = ADDR（MY_DATA_FOO）;
        __end_of_MY_DATA_FOO =。
        __size_of_MY_DATA_FOO = SIZEOF（MY_DATA_FOO）;
    }＆GT;富    组：
    {
        MY_DATA_BAR：{}
        __start_of_MY_DATA_BAR = ADDR（MY_DATA_BAR）;
        __end_of_MY_DATA_BAR =。
        __size_of_MY_DATA_BAR = SIZEOF（MY_DATA_BAR）;
    }＆GT;酒吧
}
 

解决方案

填充可以通过合并细分除去

例如：

 的#pragma data_seg（。foo_begin）
的#pragma data_seg（。foo_data）
的#pragma data_seg（。foo_end）的#pragma评论（连接器，/merge:.foo_begin=.foo）
的#pragma评论（连接器，/merge:.foo_data=.foo）
的#pragma评论（连接器，/merge:.foo_end=.foo）__declspec（分配（）foo_begin）INT foo_begin_marker;
__declspec（分配（）foo_end）INT foo_end_marker;__declspec（分配（）foo_data）INT foo_data;
 

I'm struggling to convert a C-program linked with ld, of the gnu tool-chain to make it compile as a visual-studio (2005) project. The program puts .data-symbols in different segments and during an initialization phase it copies data between segments. Pointers to the start and end of the segments are defined in the ld linker script.

I understand how to locate the variables into different, user-defined segments, but i havent been able to figure out how to define linker constants such as _start_of_my_segment or if there is something similar to a linker script in Visual Studio.

My goal is to be able to compile the program with, prefferably no modifications to the source-code that refers to the linker-defined symbols, but with my own custom layout of the data in the Visual Studio project.

Below is some example C-code that illustrates what i'd like to do and a (stripped-down, possibly syntax-incorrect) version of the make-script used when linking with gcc/ld.

Any hints would be greatly appreciated!

#pragma data_seg( "MY_DATA_FOO" )
#pragma data_seg( "MY_DATA_BAR" )
#pragma comment(linker, "/section:MY_DATA_BAR,R")

__declspec(allocate("MY_DATA_FOO")) int foo1;
__declspec(allocate("MY_DATA_FOO")) int foo2;

__declspec(allocate("MY_DATA_BAR")) int bar1 = 1;
__declspec(allocate("MY_DATA_BAR")) int bar2 = 2;

#pragma data_seg( )
void test() {
    foo1 = bar1;
    foo2 = bar2;

    // i would rather do this as 
    //extern unsigned int __start_of_MY_DATA_FOO;
    //extern unsigned int __start_of_MY_DATA_BAR;
    //extern unsigned int __size_of_MY_DATA_BAR;
    //memcpy(__start_of_MY_DATA_FOO, _start_of_MY_DATA_BAR, _size_of_MY_DATA_BAR);
}

Pseudo link-script (what would be the equivalent for Visual Studio

MEMORY
{
  foo:  org=0x1000, len=0x100
  bar:  org=0x2000, len=0x100
}

SECTIONS
{
    GROUP:
    {
        MY_DATA_FOO : {}
        __start_of_MY_DATA_FOO = ADDR(MY_DATA_FOO);
        __end_of_MY_DATA_FOO = .;
        __size_of_MY_DATA_FOO = SIZEOF(MY_DATA_FOO);
    } > foo

    GROUP:
    {
        MY_DATA_BAR : {}
        __start_of_MY_DATA_BAR = ADDR(MY_DATA_BAR);
        __end_of_MY_DATA_BAR = .;
        __size_of_MY_DATA_BAR = SIZEOF(MY_DATA_BAR);
    } > bar
}

解决方案

padding can be removed by segments merging

for example

#pragma data_seg(".foo_begin")
#pragma data_seg(".foo_data")
#pragma data_seg(".foo_end")

#pragma comment( linker, "/merge:.foo_begin=.foo" )
#pragma comment( linker, "/merge:.foo_data=.foo" )
#pragma comment( linker, "/merge:.foo_end=.foo" )

__declspec(allocate(".foo_begin")) int foo_begin_marker;
__declspec(allocate(".foo_end")) int foo_end_marker;

__declspec(allocate(".foo_data")) int foo_data;

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