/*
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/*
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* instr.h -- instruction encoding
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* instr.h -- instruction encoding
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*/
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*/
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#ifndef _INSTR_H_
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#ifndef _INSTR_H_
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#define _INSTR_H_
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#define _INSTR_H_
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#define FORMAT_N 0 /* no operands */
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#define FORMAT_N 0 /* no operands */
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#define FORMAT_RH 1 /* one register and a half operand */
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#define FORMAT_RH 1 /* one register and a half operand */
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#define FORMAT_RHH 2 /* one register and a half operand */
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#define FORMAT_RHH 2 /* one register and a half operand */
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/* ATTENTION: high-order 16 bits encoded */
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/* ATTENTION: high-order 16 bits encoded */
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#define FORMAT_RRH 3 /* two registers and a half operand */
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#define FORMAT_RRH 3 /* two registers and a half operand */
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#define FORMAT_RRS 4 /* two registers and a signed half operand */
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#define FORMAT_RRS 4 /* two registers and a signed half operand */
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#define FORMAT_RRR 5 /* three register operands */
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#define FORMAT_RRR 5 /* three register operands */
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#define FORMAT_RRX 6 /* either FORMAT_RRR or FORMAT_RRH */
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#define FORMAT_RRX 6 /* either FORMAT_RRR or FORMAT_RRH */
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#define FORMAT_RRY 7 /* either FORMAT_RRR or FORMAT_RRS */
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#define FORMAT_RRY 7 /* either FORMAT_RRR or FORMAT_RRS */
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#define FORMAT_RRB 8 /* two registers and a 16 bit signed
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#define FORMAT_RRB 8 /* two registers and a 16 bit signed
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offset operand */
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offset operand */
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#define FORMAT_J 9 /* no registers and a 26 bit signed
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#define FORMAT_J 9 /* no registers and a 26 bit signed
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offset operand */
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offset operand */
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#define FORMAT_JR 10 /* one register operand */
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#define FORMAT_JR 10 /* one register operand */
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#define MASK(n) ((((Word) 1) << n) - 1)
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#define MASK(n) ((((Word) 1) << n) - 1)
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#define SIGN(n) (((Word) 1) << (n - 1))
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#define SIGN(n) (((Word) 1) << (n - 1))
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#define ZEXT16(x) (((Word) (x)) & MASK(16))
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#define ZEXT16(x) (((Word) (x)) & MASK(16))
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#define SEXT16(x) (((Word) (x)) & SIGN(16) ? \
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#define SEXT16(x) (((Word) (x)) & SIGN(16) ? \
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(((Word) (x)) | ~MASK(16)) : \
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(((Word) (x)) | ~MASK(16)) : \
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(((Word) (x)) & MASK(16)))
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(((Word) (x)) & MASK(16)))
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#define SEXT26(x) (((Word) (x)) & SIGN(26) ? \
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#define SEXT26(x) (((Word) (x)) & SIGN(26) ? \
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(((Word) (x)) | ~MASK(26)) : \
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(((Word) (x)) | ~MASK(26)) : \
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(((Word) (x)) & MASK(26)))
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(((Word) (x)) & MASK(26)))
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#define OP_ADD 0x00
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#define OP_ADD 0x00
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#define OP_ADDI 0x01
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#define OP_ADDI 0x01
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#define OP_SUB 0x02
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#define OP_SUB 0x02
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#define OP_SUBI 0x03
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#define OP_SUBI 0x03
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#define OP_MUL 0x04
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#define OP_MUL 0x04
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#define OP_MULI 0x05
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#define OP_MULI 0x05
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#define OP_MULU 0x06
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#define OP_MULU 0x06
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#define OP_MULUI 0x07
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#define OP_MULUI 0x07
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#define OP_DIV 0x08
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#define OP_DIV 0x08
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#define OP_DIVI 0x09
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#define OP_DIVI 0x09
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#define OP_DIVU 0x0A
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#define OP_DIVU 0x0A
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#define OP_DIVUI 0x0B
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#define OP_DIVUI 0x0B
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#define OP_REM 0x0C
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#define OP_REM 0x0C
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#define OP_REMI 0x0D
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#define OP_REMI 0x0D
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#define OP_REMU 0x0E
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#define OP_REMU 0x0E
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#define OP_REMUI 0x0F
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#define OP_REMUI 0x0F
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#define OP_AND 0x10
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#define OP_AND 0x10
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#define OP_ANDI 0x11
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#define OP_ANDI 0x11
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#define OP_OR 0x12
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#define OP_OR 0x12
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#define OP_ORI 0x13
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#define OP_ORI 0x13
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#define OP_XOR 0x14
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#define OP_XOR 0x14
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#define OP_XORI 0x15
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#define OP_XORI 0x15
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#define OP_XNOR 0x16
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#define OP_XNOR 0x16
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#define OP_XNORI 0x17
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#define OP_XNORI 0x17
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#define OP_SLL 0x18
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#define OP_SLL 0x18
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#define OP_SLLI 0x19
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#define OP_SLLI 0x19
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#define OP_SLR 0x1A
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#define OP_SLR 0x1A
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#define OP_SLRI 0x1B
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#define OP_SLRI 0x1B
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#define OP_SAR 0x1C
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#define OP_SAR 0x1C
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#define OP_SARI 0x1D
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#define OP_SARI 0x1D
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#define OP_LDHI 0x1F
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#define OP_LDHI 0x1F
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#define OP_BEQ 0x20
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#define OP_BEQ 0x20
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#define OP_BNE 0x21
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#define OP_BNE 0x21
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#define OP_BLE 0x22
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#define OP_BLE 0x22
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#define OP_BLEU 0x23
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#define OP_BLEU 0x23
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#define OP_BLT 0x24
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#define OP_BLT 0x24
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#define OP_BLTU 0x25
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#define OP_BLTU 0x25
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#define OP_BGE 0x26
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#define OP_BGE 0x26
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#define OP_BGEU 0x27
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#define OP_BGEU 0x27
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#define OP_BGT 0x28
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#define OP_BGT 0x28
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#define OP_BGTU 0x29
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#define OP_BGTU 0x29
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#define OP_J 0x2A
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#define OP_J 0x2A
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#define OP_JR 0x2B
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#define OP_JR 0x2B
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#define OP_JAL 0x2C
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#define OP_JAL 0x2C
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#define OP_JALR 0x2D
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#define OP_JALR 0x2D
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#define OP_TRAP 0x2E
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#define OP_TRAP 0x2E
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#define OP_RFX 0x2F
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#define OP_RFX 0x2F
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#define OP_LDW 0x30
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#define OP_LDW 0x30
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#define OP_LDH 0x31
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#define OP_LDH 0x31
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#define OP_LDHU 0x32
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#define OP_LDHU 0x32
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#define OP_LDB 0x33
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#define OP_LDB 0x33
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#define OP_LDBU 0x34
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#define OP_LDBU 0x34
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#define OP_STW 0x35
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#define OP_STW 0x35
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#define OP_STH 0x36
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#define OP_STH 0x36
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#define OP_STB 0x37
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#define OP_STB 0x37
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#define OP_MVFS 0x38
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#define OP_MVFS 0x38
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#define OP_MVTS 0x39
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#define OP_MVTS 0x39
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#define OP_TBS 0x3A
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#define OP_TBS 0x3A
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#define OP_TBWR 0x3B
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#define OP_TBWR 0x3B
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#define OP_TBRI 0x3C
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#define OP_TBRI 0x3C
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#define OP_TBWI 0x3D
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#define OP_TBWI 0x3D
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typedef struct {
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typedef struct {
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char *name;
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char *name;
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int format;
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int format;
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Byte opcode;
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Byte opcode;
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} Instr;
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} Instr;
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extern Instr instrTbl[];
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extern Instr instrTbl[];
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extern Instr *instrCodeTbl[];
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extern Instr *instrCodeTbl[];
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void initInstrTable(void);
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void initInstrTable(void);
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Instr *lookupInstr(char *name);
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Instr *lookupInstr(char *name);
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#endif /* _INSTR_H_ */
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#endif /* _INSTR_H_ */
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