lkml.org 
[lkml]   [2006]   [Jun]   [6]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: x86_64 system call entry points II
FromAndi Kleen <>
Date06 Jun 2006 07:30:06 +0200
Martin Bisson <bissonm@discreet.com> writes:
> 
> - int $0x80/64 bits: All system calls return -1 (EINTR).  Is there
> something wrong in the way I call it:
> pid_t getpid64()
> {
>     pid_t resultvar;
> 
>     asm volatile (
>     "int $0x80\n\t"
>     : "=a" (resultvar)     : "0" (__NR_getpid)
>     : "memory");
> 
>     return resultvar;
> }

I tested it now. Since it ends up as a 32bit syscall you're not 
actually calling 64bit getpid() - but 32bit mkdir(). That is because 32bit and 64bit
have different syscall numbers. For me it returns -14, which is EFAULT.
Expected for a random argument to mkdir()

-Andi
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-06-06 07:32    [from the cache]
©2003-2008