Re: [Valgrind-developers] Darwin asm vs Linux asm

[Greg P. <gp...@ap...>]

On Feb 26, 2009, at 9:54 AM, Bart Van Assche wrote:
> On Thu, Feb 26, 2009 at 3:47 AM, Nicholas Nethercote
> <n.n...@gm...> wrote:
>> On Wed, Feb 25, 2009 at 5:56 PM, Bart Van Assche
>> <bar...@gm...> wrote:
>>> On Wed, Feb 25, 2009 at 3:50 AM, Nicholas Nethercote
>>> <n.n...@gm...> wrote:
>>>> x86/Linux assembly code and x86/Darwin assembly code appear to be
>>>> different dialects.  Some of the tests in none/tests/x86/ and
>>>> memcheck/tests/x86/ compile on x86/Darwin, eg.
>>>> memcheck/tests/bug152022.  But some don't, eg. pushfpopf, because
>>>> x86/Darwin assembler doesn't accept the .type and .size options.
>>>>
>>>> The easiest thing to do is move the ones that don't compile on  
>>>> Darwin
>>>> into an x86-linux/ directory.  Anyone have any strong opinons about
>>>> this, or other insights?
>>>
>>> Which standards apply to x86 assembler syntax ?
>>
>> I'm not sure that there are any.  This seems to be the definitive
>> documentation on Mac/x86 assembly:
>>
>> http://developer.apple.com/DOCUMENTATION/DeveloperTools/Reference/Assembler/index.html
>
> Does this mean that gcc on Darwin does not use gas but another
> assembler ? Is the gcc command-line option -mgas supported by gcc on
> Darwin ?

That's correct, Darwin uses its own home-grown assembler. I don't know  
of any GAS support for Mach-O, and -mgas is not supported.


-- 
Greg Parker     gp...@ap...     Runtime Wrangler