## Copyright (C) 2016 Jeremiah Orians
## This file is part of stage0.
##
## stage0 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.
##
## stage0 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 stage0.  If not, see <http://www.gnu.org/licenses/>.

# M2-Planet standards
DEFINE NULL 00000000

# Registers
DEFINE R0 0
DEFINE R1 1
DEFINE R2 2
DEFINE R3 3
DEFINE R4 4
DEFINE R5 5
DEFINE R6 6
DEFINE R7 7
DEFINE R8 8
DEFINE R9 9
DEFINE R10 A
DEFINE R11 B
DEFINE R12 C
DEFINE BP C
DEFINE R13 D
DEFINE SP D
DEFINE R14 E
DEFINE LR E
DEFINE R15 F
DEFINE PC F

# Register masks for push/pop16
DEFINE {R0} 0100
DEFINE {R1} 0200
DEFINE {R2} 0400
DEFINE {R3} 0800
DEFINE {R4} 1000
DEFINE {R11} 0008
DEFINE {BP} 0010
DEFINE {LR} 0040

# Bitshift constants
DEFINE NO_SHIFT 0
DEFINE LEFT 1
DEFINE RIGHT 3
DEFINE ARITH_RIGHT 5

# LOAD/STORE
DEFINE MEMORY E5
DEFINE STORE32 08
DEFINE STORE8 0C
DEFINE LOAD32 09
DEFINE LOAD8 0D
DEFINE LOADI8_ALWAYS 0A0E3
DEFINE LOADI8_G 0A0C3
DEFINE LOADI8_GE 0A0A3
DEFINE LOADI8_EQUAL 0A003
DEFINE LOADI8_NE 0A013
DEFINE LOADI8_LE 0A0D3
DEFINE LOADI8_L 0A0B3

# JUMP/BRANCH
DEFINE JUMP_ALWAYS EA
DEFINE JUMP_EQUAL 0A
DEFINE JUMP_NE 1A
DEFINE CALL_ALWAYS EB
DEFINE CALL_REG_ALWAYS FF2FE1
DEFINE RETURN FF2FE1

# Data movement
DEFINE MOVE_ALWAYS A0E1
DEFINE MVN_ALWAYS 0E0E1
DEFINE MVN_LT 0E0B1
DEFINE MVNI8_EQUAL 0E003
DEFINE PUSH_ALWAYS 2DE9
DEFINE POP_ALWAYS BDE8

# Arithmetic/logic
DEFINE AUX_ALWAYS E1
DEFINE IMM_ALWAYS E3
DEFINE ARITH_ALWAYS E2
DEFINE ARITH_GE A2
DEFINE ARITH_LT B2
DEFINE ARITH_NE 12
DEFINE ARITH2_ALWAYS E0
DEFINE ARITH2_GE A0
DEFINE ADC 0A
DEFINE ADCS 0B
DEFINE ADD 08
DEFINE ADDS 09
DEFINE AND 00
DEFINE CMP 005
DEFINE CMPI8 005
DEFINE MUL 0
DEFINE MULS 1
DEFINE OR 08
DEFINE SHIFT A0
DEFINE SUB 04
DEFINE RSUB 06
DEFINE XOR 02

# SYSCALL
DEFINE SYSCALL_ALWAYS 000000EF
