x64 nasm: pushing memory addresses onto the stack & call function

Question

I\'m pretty new to x64-assembly on the Mac, so I\'m getting confused porting some 32-bit code in 64-bit.
The program should simply print out a message via the prin

Answer 1

According to the documentation for the x86 64bit instruction set http://download.intel.com/products/processor/manual/325383.pdf

PUSH only accepts 8, 16 and 32bit immediate values (64bit registers and register addressed memory blocks are allowed though).

PUSH msg

Where msg is a 64bit immediate address will not compile as you found out.

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What calling convention is _printf defined as in your 64bit library?

Is it expecting the parameter on the stack or using a fast-call convention where the parameters on in registers? Because x86-64 makes more general purpose registers available the fast-call convention is used more often.