On Tue, Sep 23, 2014 at 6:41 PM, Andrew Haley <a...@redhat.com> wrote: > > And neither are they used by the asm; so you have no right to expect %edx > to contain anything, and neither have you the right to touch it. > > Do this: > > asm volatile ( > "pushl %1;" > "call *%%eax;" > "addl $4, %%esp;" > : "=a"(status) : "m"(params_ptr), "a"(pcall), "d"(d) > ); > > > "If you lie to the compiler, it will get its revenge." -- Henry Spencer > > Andrew. >
Thanks for the hint. But doing "d"(d) does not fix the problem and gcc still refuses to generate codes for "params.a = d;". Seems to me adding "d"(d) only guarantee parameter d is put into %edx, nothing else. Regards, Bin
