On 1/5/08, Brian <[EMAIL PROTECTED]> wrote: > Are register values preserved between function calls on amd64? I'm pretty > sure > they are whipped out on i386, but I'm sure about amd64. > > Do I need to write parameters to %rbp offset, then follow the x86-abi for > registers to write to before making the function call? When I disassemble C > code, it looks like the parameters are written to %rbp, then to the registers > per the x86-84 abi, and then the function is called? Is this the preferred > way > to write function calls? And I would use the same method to save the return > value in %rax, right?
it should be spilling the old register values to the stack, not the new arguments. arguments after 4 do go on the stack though.
