GCC modification for ARM

[Joel Sherrill]

Charles Steaderman wrote:
> 
> I am trying to port RTEMS to an ARM7 CPU. Unfortunately, the chip
> manufacturer has a bug in which data corruption can occur when using DMA
> when a SWP instruction is executed. I know that RTEMS uses patched
> compilers and libraries and I was wondering if anyone is familiar enough
> with GCC to direct me where to make a change to replace the SWP
> instruction with LDR and STR instructions.

The source for this has to be in gcc-XXX/gcc/config/arm and is probably
in
arm.md.  grep there and you might already find an option to switch the
behavior.

> Thanks,
> - Charlie
> 
> --
> Charlie Steaderman
> charlies at poliac.com
> VP Engineering
> Poliac Research Corporation
> Phone: 952.707.6245
> Cel: 612.242.6364

-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel at OARcorp.com                 On-Line Applications Research
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