gcc assembly

andystanfordjason · 04-24-2008, 03:57 AM

does anyone know where i can find out how gcc passes variables through function calls? more specifically, which registers is puts variables in when its not using the stack. thanks vary much

jf.argentino · 04-24-2008, 06:14 AM

You can transform a c file into its assembly code with "gcc -S"

osor · 04-24-2008, 10:47 AM

You are basically asking about the calling convention for your specific arch. For most archs, there is an ABI which extends SVID, and details the calling convention. Usually, gcc tries to follow that ABI.

Here is a nice document which details the default calling conventions of various compilers for the x86 and x86_64 architectures.

andystanfordjason · 04-25-2008, 04:10 AM

thnaks very much, thats perfect