Problems with parsing "Extended Asm"

When I was tried to parse source with several asm instructions (described at http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html)
I faced with fails to parse similar pieces:

1 . void read_tsc(void) {
long val;
**asm**("rdtsc" : "=A" (val));
}

whereas _asm(''nothing")_ mistakenly recognized as function call.

2 . void read_tsc(void) {
long val;
asm **volatile**("rdtsc" : "=A" (val));
}

3 . void read_tsc(void) {
long fpenv;
asm(""mtfsf 255,%0"
**: :**
"f" (fpenv));
}

I suppose that highlighted parts are different states for context-free grammar used by pycparserext in whole.