32-Bit Application Binary Interface

OS X ABI Function Call Guide describes the function-calling conventions used in all the architectures supported by Mac OS X. For detailed information about the IA-32 ABI, read the section “IA-32 Function Calling Conventions,” which:

• Lists data types, sizes, and natural alignment

• Describes stack structure

• Discusses prologs and epilogs

• Provides details on how arguments are passed and results are returned

• Tells which registers preserve their value after a procedure call and which ones are volatile