On Tue, Sep 23, 2014 at 12:41 PM, Andrew Haley <a...@redhat.com> wrote: > On 09/23/2014 10:39 AM, Bin Meng wrote: >> On Tue, Sep 23, 2014 at 5:11 PM, Bin Meng <bmeng...@gmail.com> wrote: >>> >>> Sorry I still don't get it. The inline-asm codes are put in the very end >>> of the test function just before return, so the clobbered registers are >>> not used by gcc. > > 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) > ); >
I suppose doing "m" (*params_ptr) would also work. Richard. > "If you lie to the compiler, it will get its revenge." -- Henry Spencer > > Andrew. >
