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/*
* 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.
*/
#ifndef _INSTRUCTION_H_
#define _INSTRUCTION_H_
/*
* 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;
#define I_TYPE(instr, op) \
struct i_type *instr = (struct i_type *) &op
/* 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;
#define R_TYPE(instr, op) \
struct r_type *instr = (struct r_type *) &op
/* J-Type instruction */
struct j_type {
uint8_t op:6;
uint32_t imm26:26;
} __packed;
#define J_TYPE(instr, op) \
struct j_type *instr = (struct j_type *) &op
/*
* Instruction Opcodes
*/
/*
* OP Encodings for I-Type instructions (except for CALL and JMPI, which are
* J-type instructions)
*/
enum {
CALL = 0x00, /* J-type */
JMPI = 0x01, /* J-type */
/* 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,
/* 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,
};
#define I_TYPE_COUNT 0x40
/* 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,
};
#define R_TYPE_COUNT 0x40
/* Forward declaration */
struct nios2;
typedef uint32_t (*instruction_handler)(struct nios2 *cpu, uint32_t opcode);
#endif /* _INSTRUCTION_H_ */
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