__stdcall is the calling convention used for the function. This tells the compiler the rules that apply for setting up the stack, pushing arguments and getting a return value. There are a number of other calling conventions, __cdecl, __thiscall, __fastcall and the wonderfully named __declspec(naked). __stdcall is the standard calling convention for Win32 system calls. … Read more
Simple answer: I use cdecl, stdcall, and fastcall. I seldom use fastcall. stdcall is used to call Windows API functions. Detailed answer (Stolen from Wikipedia): cdecl – In cdecl, subroutine arguments are passed on the stack. Integer values and memory addresses are returned in the EAX register, floating point values in the ST0 x87 register. … Read more
Answer recommended by Intel
It depends on the ABI for the platform you are compiling for. On Linux, there are two ARM ABIs; the old one and the new one. AFAIK, the new one (EABI) is in fact ARM’s AAPCS. The complete EABI definitions currently live here on ARM’s infocenter. From the AAPCS, ยง5.1.1: r0-r3 are the argument and … Read more
Caller-saved registers (AKA volatile registers, or call-clobbered) are used to hold temporary quantities that need not be preserved across calls. For that reason, it is the caller’s responsibility to push these registers onto the stack or copy them somewhere else if it wants to restore this value after a procedure call. It’s normal to let … Read more