What is default C calling convention on 32 bit Linux and 64 bit Linux (Intel desktop CPU)?

Question

What is default calling convention for a static function say:

static void PrintHelloWorld(char* s) { }

under

Linux:

#36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

and with

gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3 Linux ubuntu 3.2.0-23-generic

Answer 1

Under the architecture and compiler you have listed (Linux x86_64), the calling convention described in the System V AMD64 ABI is used.

Under Linux i386, the calling convention described in the System V i386 ABI is used.