Calling conventions for IAR

[jonsmirl at gmail.com]

On Thu, Nov 18, 2010 at 4:26 AM, Russell King - ARM Linux
<linux at arm.linux.org.uk> wrote:
> On Wed, Nov 17, 2010 at 04:29:36PM -0500, jonsmirl at gmail.com wrote:
>> Currently we are using the ARM gcc AAPCS calling conventions. I need
>> to call into an older ROM written with an IAR compiler. Can I decorate
>> the function declarations for older calling conventions like I do on
>> x86 (_fastcall, _cdelc, _stdcall, etc)? I can't figure out the right
>> thing to search for, what's a good keyword?
>
> I think you're out of luck... you're probably better off writing some
> glue assembler code to call these functions.
>

We used to use -mcallee-super-interworking to get to these IAR
routines. They are in thumb code. "-mcallee-super-interworking" has
been removed from recent gcc compilers.

I found this:
http://stuff.mit.edu/afs/sipb/project/egcs/src/egcs/gcc/config/arm/README-interworking

Which says you can decorate like this:
int call () __attribute__((interfacearm));

But that seems to be gone too:
../lib/nvm.c:5:1: warning: ‘interfacearm’ attribute directive ignored

-- 
Jon Smirl
jonsmirl at gmail.com