ARM calling conventions on WinCE and Linux?

Do WinCE and Linux use the same calling convention on ARM? What are the differences?

The documents I've found so far do not explain very well. For example on http://msdn.microsoft.com/en-us/library/ms864497.aspx, it says "Windows CE .NET Compiler" on one line, but "the ARM compiler" on the next line, and "CLARM" at the bottom, and it's not clear whether it is referring to the same compiler or different compilers. Here's what I've found so far...

• ARM Calling Sequence Specification (WinCE) - poorly-written documentation
• ARM to C calling convention (Linux) - informal explanation
• Wikipedia - no OS is specified and it d开发者_Python百科oes not say how structures, floating-point or 64-bit numbers are handled, and it does not say where extra arguments are placed in case they do not fit in registers.
• Update: Procedure Call Standard for the ARM Architecture - finally I found a comprehensive document, but it doesn't say which operating systems follow the standard (or what variants or additional constraints those OSs might impose).

The reason I ask is that I'd like to try using LLVM in WinCE to generate some simple code at run-time, but it only officially supports Linux.

Calling conventions are something that are implemented by the compiler and are not operating system specific. Having said that I can confirm that both gcc and RVCT (ARM's c/c++ compiler) both generate code that follow the Procedure call convention for ARM architecture that you mentioned above.

Looking at the link to the Microsoft documentation, I can also confirm that it follows the ARM calling convention.

I came across the exact same question for which I tried to find an answer. Namely where / what document says something or defines the ARM ABI used under LINUX.

The following document is the closest I came to an answer

ARM GNU/Linux Application Binary Interface Supplement

it is by CodeSourcery and in encoded in its abstract lies in my opinion an answer to the question above, namely that:

The Application Binary Interface (ABI) for the ARM Architecture ( a document published by ARM Ltd ) specifies various aspects of compilation and linkage required for interoperation between toolchains used for the ARM Architecture.

However, as the ABI published in this document is designed without reference to a particular operating system, there are certain aspects which remain unspecified.

Apparently the document by CodeSourcery, is intended to supplement the ABI for the ARM Architecture by specifying the decisions made for these aspects when using the GNU/Linux operating system.

I supply one link to this document ( others could be found by searching for the document's title ):

http://www.boost.org/doc/libs/1_51_0_beta1/libs/context/doc/pdf/arm-linux-aapcs.pdf

It seems that a standard specifying the ARM ABI under LINUX didn't exist, and again it seems that the document by CodeSourcery is an attempt at covering this aspect.