Re: [ANNOUNCE] GCC 3.3.1 uClinux/ColdFire toolchain (20030725 snapshot)

[Bernardo Innocenti <bernie at develer dot com>]

On Friday 25 July 2003 07:15, Chris Johns wrote:
> Bernardo Innocenti wrote:
> >  - Fix atomic operations in libstdc++ for ColdFire V2 & V3 cores
> > (iostreams now work).
>
> Is this common to all Coldire users or just uCLinux users of libstdc++ ?

The old version had special ColdFire support for vxWorks and other targets
defining the __embedded__ preprocessor symbol.

This code path was using a privileged instruction (move #0,%sr) to turn
interrupts off when updating the counter. Since uClinux also defines __embedded__,
user applications linking with libstdc++ were segfaulting on the supervisor-only
opcode.

There was also generic thread-unsafe C code to be used as a last resort.

This patch replaces all of those variants with a single case using either
TAS (for 680x0, CPU32 and 5407) or BTST, which is atomic on non-SMP systems.

> If common, could I please have a copy of the patch ?

Here it is:

  http://www.develer.com/uclinux/uclinux-elf-tools/gcc-3.3.1-libstdc++-atomicity.patch

I'm still waiting for my copyright assignment papers from FSF. Please feel free to
make a patch for GCC if you like.

-- 
  // Bernardo Innocenti - Develer S.r.l., R&D dept.
\X/  http://www.develer.com/

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