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/*

 * instr.h -- instruction encoding

 */

#ifndef _INSTR_H_

#define _INSTR_H_

#define FORMAT_N        0        /* no operands */

#define FORMAT_RH       1       /* one register and a half operand */

#define FORMAT_RHH      2       /* one register and a half operand */

                                /* ATTENTION: high-order 16 bits encoded */

#define FORMAT_RRH      3       /* two registers and a half operand */

#define FORMAT_RRS      4       /* two registers and a signed half operand */

#define FORMAT_RRR      5       /* three register operands */

#define FORMAT_RRX      6       /* either FORMAT_RRR or FORMAT_RRH */

#define FORMAT_RRY      7       /* either FORMAT_RRR or FORMAT_RRS */

#define FORMAT_RRB      8       /* two registers and a 16 bit signed

                                   offset operand */

#define FORMAT_J        9       /* no registers and a 26 bit signed

                                   offset operand */

#define FORMAT_JR       10      /* one register operand */

#define MASK(n)         ((((Word) 1) << n) - 1)

#define SIGN(n)         (((Word) 1) << (n - 1))

#define ZEXT16(x)       (((Word) (x)) & MASK(16))

#define SEXT16(x)       (((Word) (x)) & SIGN(16) ? \

                         (((Word) (x)) | ~MASK(16)) : \

                         (((Word) (x)) & MASK(16)))

#define SEXT26(x)       (((Word) (x)) & SIGN(26) ? \

                         (((Word) (x)) | ~MASK(26)) : \

                         (((Word) (x)) & MASK(26)))

#define OP_ADD          0x00

#define OP_ADDI         0x01

#define OP_SUB          0x02

#define OP_SUBI         0x03

#define OP_MUL          0x04

#define OP_MULI         0x05

#define OP_MULU         0x06

#define OP_MULUI        0x07

#define OP_DIV          0x08

#define OP_DIVI         0x09

#define OP_DIVU         0x0A

#define OP_DIVUI        0x0B

#define OP_REM          0x0C

#define OP_REMI         0x0D

#define OP_REMU         0x0E

#define OP_REMUI        0x0F

#define OP_AND          0x10

#define OP_ANDI         0x11

#define OP_OR           0x12

#define OP_ORI          0x13

#define OP_XOR          0x14

#define OP_XORI         0x15

#define OP_XNOR         0x16

#define OP_XNORI        0x17

#define OP_SLL          0x18

#define OP_SLLI         0x19

#define OP_SLR          0x1A

#define OP_SLRI         0x1B

#define OP_SAR          0x1C

#define OP_SARI         0x1D

#define OP_LDHI         0x1F

#define OP_BEQ          0x20

#define OP_BNE          0x21

#define OP_BLE          0x22

#define OP_BLEU         0x23

#define OP_BLT          0x24

#define OP_BLTU         0x25

#define OP_BGE          0x26

#define OP_BGEU         0x27

#define OP_BGT          0x28

#define OP_BGTU         0x29

#define OP_J            0x2A

#define OP_JR           0x2B

#define OP_JAL          0x2C

#define OP_JALR         0x2D

#define OP_TRAP         0x2E

#define OP_RFX          0x2F

#define OP_LDW          0x30

#define OP_LDH          0x31

#define OP_LDHU         0x32

#define OP_LDB          0x33

#define OP_LDBU         0x34

#define OP_STW          0x35

#define OP_STH          0x36

#define OP_STB          0x37

#define OP_MVFS         0x38

#define OP_MVTS         0x39

#define OP_TBS          0x3A

#define OP_TBWR         0x3B

#define OP_TBRI         0x3C

#define OP_TBWI         0x3D

typedef struct {

  char *name;

  int format;

  Byte opcode;

} Instr;

extern Instr instrTbl[];

extern Instr *instrCodeTbl[];

void initInstrTable(void);

Instr *lookupInstr(char *name);

#endif /* _INSTR_H_ */