return keyword on prototypes;
mov myvar,invoke function,par1,par2,par3
From what I have see, on ms-dos, linux and windows (32 or 64), most functions return values on ax/eax/rax register, and if 2nd return value exists it will be on dx/edx/rdx register. But some functions can return some flags setup. This can be expanded to xmm registers, ... .
If function above have a void return type, so an error message should inform user.
A enum macro can be usefull too.
A syscall like invoke (with prototype check):
__NR_exit equ 60 <--- an enum
syscall __NR_exit,0 <---
I cannot create prototypes to syscall instruction, the same way I can't create to 'int' instruction, like int 80,int 21,int 2f...
syscall eax,rdi,rsi,rdx,r10,r8,r9 <--eax means function enum, other registers are parameters, used on linux x86-64.
int 80h,eax,ebx,ecx,edx,esi,edi,ebp <--eax means function enum, used on linux 32 to call native functions, system call.
Please, check abi just to be sure if sequence above is right.
So, you should create a new name (cannot be invoke because we can mix 'call' and 'syscall' on same source code) , I don't have suggestions, and program will appear like ideal mode to be portable, we can port linux 32 to 64 bits this way. What changes are enumerations only. On 32 bits, "__NR_exit EQU 1" and on x86-64 "__NR_exit EQU 60".
I don't have sure if on linux 32 bits have 2 different calling way, maybe from kernel 2.2 below is one and above 2.2 is the one listed above.
So, linux to bsd can be done too (bsd use other abi or calling convention, I don't know exact name to be said).
