Re: call instruction question

[John Fine <johnsfine@xxxxxxxxxxx>]

horseriver wrote:
>                 1. why use "fc ff ff ff "  in call instruction?
>   
The call uses PC relative addressing that at execution time is relative 
to the address of the instruction AFTER the call instruction.
But the relative fixup that the compiler can request from the linker is 
relative to the location being fixed, which is inside the call instruction.
So the final value required is four less than the fixup the linker will 
require, so the compiler has initialized the value to be fixed as minus 
four.