oriansj--M2libc/knight/libc-core.M1

## Copyright (C) 2016 Jeremiah Orians
## This file is part of M2-Planet.
##
## M2-Planet is free software: you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## M2-Planet is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with M2-Planet.  If not, see <http://www.gnu.org/licenses/>.

:_start
	;; Kernel Setup R12 as HEAP pointer after end of the stack
	;; Kernel Setup R15 as Stack pointer after the initial stack frame

	;; Default stack frame is:
	;; ARGC, ARGV, ENVP, NULL

	SUBI R14 R15 16             ; Set our base pointer

	;; Perform the main loop
	LOADR R0 4
	JUMP 4
	&FUNCTION_main
	CALL R0 R15

	COPY R14 R15                ; Setup base pointer
	PUSHR R0 R15                ; Put return on the stack

:FUNCTION_exit
:FUNCTION__exit
	LOAD R0 R14 0
	SYS_EXIT