interesting,i search the google and find that it is in the gcc document. http://coding.derkeiler.com/Archive/Assembler/comp.lang.asm.x86/2007-03/msg00046.html http://gcc.gnu.org/onlinedocs/gcc-3.4.6/gcc/Modifiers.html 2009/11/15 Peter Teoh <htmldeveloper@xxxxxxxxx>: > this is interesting.... > > from > > http://www.nongnu.org/avr-libc/user-manual/inline_asm.html > > it seemed to mean "read-write"? > > and perhaps someone should update this: > > http://www.ibiblio.org/gferg/ldp/GCC-Inline-Assembly-HOWTO.html > > as I cannot find any such feature mentioned as well. > > On Sat, Nov 14, 2009 at 11:15 AM, dinesh bhaskar <pdineshb@xxxxxxxxx> wrote: >> >> Hello all, >> >> can somebody explain me the following assembly syntax, this I have >> seen in Linux kernel code. >> >> asm volatile("int $0x16" >> : "+a" (ax), "+b" (bx) >> : : "ecx", "edx", "esi", "edi"); >> >> I did not understand :"+a" mean. what does "+" tell there? >> Generally we use "=a", indicating the output operands and other >> registers are indicated as clobbered registeres. >> >> >> TIA >> dinesh >> >> -- >> To unsubscribe from this list: send an email with >> "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx >> Please read the FAQ at http://kernelnewbies.org/FAQ >> > > > > -- > Regards, > Peter Teoh > -- Best Regards Lin -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
