diff options
Diffstat (limited to 'instruction.h')
| -rw-r--r-- | instruction.h | 288 |
1 files changed, 178 insertions, 110 deletions
diff --git a/instruction.h b/instruction.h index 2253c86..7b5d510 100644 --- a/instruction.h +++ b/instruction.h @@ -1,120 +1,188 @@ /* - Nios-sim - one simple NIOSII simulator only for personal interest and fun. - Copyright (C) 2010 chysun2000@gmail.com + * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> + * Copyright (C) 2010 chysun2000@gmail.com + * + * This file is part of nios2sim-ng. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ - This program 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 2 of the License, or - (at your option) any later version. +#ifndef _INSTRUCTION_H_ +#define _INSTRUCTION_H_ - This program 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. +/* + * Instruction Word Formats + */ + +/* I-Type instruction */ +struct i_type { + uint8_t op:6; + uint16_t imm16; + uint8_t b:5; + uint8_t a:5; +} __packed; - You should have received a copy of the GNU General Public License along - with this program; if not, write to the Free Software Foundation, Inc., - 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. -*/ +/* R-Type instruction */ +struct r_type { + uint8_t op:6; + /* + * Some R-Type instructions embed a small immediate value in the + * low-order bits of OPX. + */ + union { + uint16_t opx11:11; + struct { + uint8_t n:5; + uint8_t opx6:6; + } __packed; + } opx; + uint8_t c:5; + uint8_t b:5; + uint8_t a:5; +} __packed; -#ifndef __INSTRUCTION_H__ -#define __INSTRUCTION_H__ +/* J-Type instruction */ +struct j_type { + uint8_t op:6; + uint32_t imm26:26; +} __packed; + +/* + * Instruction Opcodes + */ -/*--J_TYPE-------------------------------------------------------------*/ -/*--R_TYPE-------------------------------------------------------------*/ -enum OPX_TYPE_INSTR{ - ERET = 0x01, - ROLI = 0x02, - ROL = 0x03, - FLUSHP = 0x04, - RET = 0x05, - NOR = 0x06, - MULXUU = 0x07, - CMPGE = 0x08, - BRET = 0x09, - ROR=0x0B, - FLUSHI=0x0c, - JMP=0x0d, - AND=0x0e, - CMPLT = 0x10, - SLLI = 0x12, - SLL=0x13, - WRPRS = 0x14, - OR = 0x16, - MULXSU=0x17, - CMPNE=0x18, - SRLI = 0x1A, - SRL=0x1b, - NEXTPC=0x1c, - CALLR = 0x1D, - XOR=0x1e, - MULXSS=0x1f, - CMPEQ=0x20, - DIVU = 0x24, - DIV=0x25, - RDCTL, - MUL, - CMPGEU, - INITI, - TRAP = 0x2D, - WRCTL, - CMPLTU = 0x30, - ADD, - BREAK = 0x34, - SYNC = 0x36, - SUB = 0x39, - SRAI = 0x3A, - SRA=0x3b +/* OPX Encodings for R-Type instructions */ +enum { + /* 0x00 */ + ERET = 0x01, + ROLI = 0x02, + ROL = 0x03, + FLUSHP = 0x04, + RET = 0x05, + NOR = 0x06, + MULXUU = 0x07, + CMPGE = 0x08, + BRET = 0x09, + /* 0x0A */ + ROR = 0x0B, + FLUSHI = 0x0C, + JMP = 0x0D, + AND = 0x0E, + /* 0x0F */ + CMPLT = 0x10, + /* 0x11 */ + SLLI = 0x12, + SLL = 0x13, + /* 0x14 */ + /* 0x15 */ + OR = 0x16, + MULXSU = 0x17, + CMPNE = 0x18, + /* 0x19 */ + SRLI = 0x1A, + SRL = 0x1B, + NEXTPC = 0x1C, + CALLR = 0x1D, + XOR = 0x1E, + MULXSS = 0x1F, + CMPEQ = 0x20, + /* 0x21 */ + /* 0x22 */ + /* 0x23 */ + DIVU = 0x24, + DIV = 0x25, + RDCTL = 0x26, + MUL = 0x27, + CMPGEU = 0x28, + INITI = 0x29, + /* 0x2A */ + /* 0x2B */ + /* 0x2C */ + TRAP = 0x2D, + WRCTL = 0x2E, + /* 0x2F */ + CMPLTU = 0x30, + ADD = 0x31, + /* 0x32 */ + /* 0x33 */ + BREAK = 0x34, + /* 0x35 */ + SYNC = 0x36, + /* 0x37 */ + /* 0x38 */ + SUB = 0x39, + SRAI = 0x3A, + SRA = 0x3b, }; -/*--I_TYPE-------------------------------------------------------------*/ -enum OP_TYPE_INSTR{ - CALL = 0x00, - JMPI = 0x01, - LDBU = 0x03, - ADDI = 0x04, - STB = 0x05, - BR = 0x06, - LDB = 0x07, - CMPGEI = 0x08, - LDHU = 0x0B, - ANDI = 0x0C, - STH = 0x0D, - BGE = 0x0E, - LDH = 0x0F, - CMPLTI = 0x10, - INITDA = 0x13, - ORI, - STW, - BLT, - LDW, - CMPNEI=0x18, + +/* + * OP Encodings for I-Type instructions (except for CALL, which is a J-type + * instruction) + */ +enum { + CALL = 0x00, /* J-type */ + JMPI = 0x01, + /* 0x02 */ + LDBU = 0x03, + ADDI = 0x04, + STB = 0x05, + BR = 0x06, + LDB = 0x07, + CMPGEI = 0x08, + /* 0x09 */ + /* 0x0A */ + LDHU = 0x0B, + ANDI = 0x0C, + STH = 0x0D, + BGE = 0x0E, + LDH = 0x0F, + CMPLTI = 0x10, + /* 0x11 */ + /* 0x12 */ + INITDA = 0x13, + ORI = 0x14, + STW = 0x15, + BLT = 0x16, + LDW = 0x17, + CMPNEI = 0x18, + /* 0x19 */ + /* 0x1A */ FLUSHDA = 0x1B, - XORI = 0x1C, - BNE = 0x1E, - CMPEQI = 0x20, - LDBUIO = 0x23, - MULI, - STBIO, - BEQ, - LDBIO, - CMPGEUI=0x28, - LDHUIO = 0x2B, - ANDHI = 0x2C, - STHIO = 0x2D, - BGEU = 0x2E, - LDHIO = 0x2F, - CMPLTUI = 0x30, - CUSTOM = 0x32, - INITD, - ORHI, - STWIO, - BLTU, - LDWIO, - RDPRS, - R_TYPE = 0x3A, - FLUSHD = 0x3B, - XORHI = 0x3C + XORI = 0x1C, + /* 0x1D */ + BNE = 0x1E, + /* 0x1F */ + CMPEQI = 0x20, + /* 0x21 */ + /* 0x22 */ + LDBUIO = 0x23, + MULI = 0x24, + STBIO = 0x25, + BEQ = 0x26, + LDBIO = 0x27, + CMPGEUI = 0x28, + /* 0x29 */ + /* 0x2A */ + LDHUIO = 0x2B, + ANDHI = 0x2C, + STHIO = 0x2D, + BGEU = 0x2E, + LDHIO = 0x2F, + CMPLTUI = 0x30, + /* 0x31 */ + CUSTOM = 0x32, + INITD = 0x33, + ORHI = 0x34, + STWIO = 0x35, + BLTU = 0x36, + LDWIO = 0x37, + /* 0x38 */ + /* 0x39 */ + R_TYPE = 0x3A, + FLUSHD = 0x3B, + XORHI = 0x3C, }; -#endif - +#endif /* _INSTRUCTION_H_ */ |