__asm__ and -fPIC problem

[Etienne Lorrain]

Marcus Meissner wrote:
> Compiling WINE with gcc-2.95.1 and gcc-latest (via webfrontend) has some
> strange __asm__ complaints. I am not sure whether this is a bug on our
> (WINE)side, or a gcc bug. I've attached the small testcase I could
extract.

 I cannot help you with -fPIC, but there is something strange
in your testcase:
        __asm__ __volatile__(
                 "pushl %%es\n"
                 "pushl %%ds\n"
                 "pushfl\n"
                 "movl %5,%%es\n"
                 "movl %4,%%ds\n"

  After pushing registers on the stack, you can no more
 use %5 and %6 because they may be variables in stack - so
 will be encoded like "10(%esp)" - with the _old_ value of %esp !

  That is why it would be interresting to be able to clobber
 %ds, %es, %fs, %gs, %ebp, but that is another story...

  Hope that helps,
  Etienne.

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