什么是Windows RT ARM的原生code调用约定？ [英] What is the Windows RT on ARM native code calling convention?

问题描述

我找不到ARM的调用约定由Visual Studio C ++使用的Windows RT的任何文件。微软是采用ARM的 AAPCS ？

如果微软正在使用AAPCS / EABI为Windows RT ARM的，是它也采用的 ARM的C ++ ABI （这是从安腾C ++ ABI派生）？也许连 ARM的异常处理ABI 的<？ / p>

在是否使用ARM的Windows RT的调用约定从所使用的不同其他（嵌入式）ARM的Windows变种？

有通过predefined编译宏来检测ARM的Windows RT的可靠途径？

的更新：增加了关于C ++ ABI的问题的

解决方案

与Windows CE（使用原来的APCS 的老又名ABI）时，Windows RT上使用ARM EABI。更具体地说，它采用浮点变体寄存器来传递浮点数据和8字节堆栈/论点对准

如果我采取以下功能：

  INT克（浮X）{
  返回X;
}
 

和与VS2012的ARM编译器编译它，我得到以下组件：

  | G | PROC
    vcvt.s32.f32 S0，S0
    VMOV R0，S0
    BX LR
    ENDP; | G |
 

您可以看到，它使用 S0 ，而不是 R0 的参数。

从VS2008（可用于针对老版本的Windows CE版本）的一家生产这样的：

 海峡LR，[SP，＃ -  4]！
LDR R3，= __ imp___stoi
LDR R3，[R3]
MOV LR，PC
BX R3
LDR PC，[SP]，＃4
 

这code是调用一个辅助函数来执行转换。

Windows CE的编译器随Windows Compact 7的支持旧的调用约定（由MS称为CDECL）和EABI。见<一href=\"http://download.microsoft.com/download/2/4/A/24A36661-A629-4CE6-A615-6B2910A1367A/What%27s%20New%20in%20Platform%20Builder.pdf\">What's在新的平台生成器7 。

修改：刚才注意到你添加一个问题关于C ++。 Microsoft不会使用安腾风格的C ++ ABI，因为其实施predates它。你可以阅读有关微软在我OpenRCE执行的文章（ 1 ，的2 ）和后续侦察presentation 。又见从设计师扬灰原介绍： PDF

I couldn't find any documentation on the Windows RT on ARM calling convention used by Visual Studio C++. Is Microsoft using ARM's AAPCS?

If Microsoft is using the AAPCS/EABI for Windows RT on ARM, is it also using ARM's C++ ABI (which is derived from the Itanium C++ ABI)? Maybe even the ARM exception handling ABI?

Does the calling convention used by Windows RT on ARM differ from that used by other (embedded) ARM Windows variants?

Is there a reliable way to detect Windows RT on ARM through predefined compiler macros?

Update: Added the question regarding the C++ ABI.

解决方案

Unlike Windows CE (which uses original APCS aka Old ABI), Windows RT on ARM uses EABI. More specifically, the variant which uses floating-point registers to pass floating-point data and 8-byte stack/argument alignment.

If I take the following function:

int g(float x) {
  return x;
}

and compile it with VS2012's ARM compiler, I get the following assembly:

|g| PROC
    vcvt.s32.f32 s0,s0
    vmov        r0,s0
    bx          lr
    ENDP  ; |g|

You can see that it's using S0 and not R0 for the argument.

The one from VS2008 (which can be used to target older Windows CE versions) produces this:

str     lr, [sp,#-4]!
ldr     r3, =__imp___stoi
ldr     r3, [r3]
mov     lr, pc
bx      r3
ldr     pc, [sp],#4

This code is calling a helper function to perform the conversion.

The Windows CE compiler shipped with Windows Compact 7 supports both the old calling convention (called "cdecl" by MS) and EABI. See What's New in Platform Builder 7.

EDIT: just now noticed you added a question about C++. Microsoft does not use Itanium-style C++ ABI, since their implementation predates it. You can read about Microsoft's implementation in my OpenRCE articles (1, 2) and the follow-up Recon presentation. See also the original description from the designer Jan Gray: PDF.

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