About function parameter access

[Mao, Bibo]

Hi all,
I find that there maybe exists one problem when accessing function
parameter. From the translated script, we can see that it uses MACRO
fetch_register to parameter value. Always in IA32 the first parameter is
placed in EAX register, and the macro is  fetch_register(0).

But when function is with asmlinkage prefix, it is stored in stack, but
not in register. Maybe it the same reason with what has been reported
as: http://sourceware.org/bugzilla/show_bug.cgi?id=1868

And I has tested systemtap.samples/sysopen.stp, this function is
prefixed with asmlinkage, filename parameter is accessed by MACRO
fetch_register(0).

Regards
Bibo,mao