In-Reply-To: <[email protected]>
On Mon, 05 Jun 2006 12:55:44 -0400, Martin Bisson wrote:
> - sysenter/32 bits, executed on a 32 bit machine: I get a segfault on
> the sysenter instruction. I use the following code to enter the system
> call:
> pid_t getpid32()
> {
> pid_t resultvar;
>
> asm volatile (
> "push %%ebp\n\t"
> "push %%ecx\n\t"
> "push %%edx\n\t"
> "mov %%esp,%%ebp\n\t"
> "sysenter\n\t"
> ".space 20,0x90\n\t"
> "pop %%edx\n\t"
> "pop %%ecx\n\t"
> "pop %%ebp\n\t"
> : "=a" (resultvar)
> : "0" (__NR_getpid)
> : "memory");
>
> return resultvar;
> }
sysenter always returns to a fixed address (in the vdso) no matter
where you invoke it from.
--
Chuck
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