/*
 * opcode.h
 * $Id: opcode.h,v 1.7 2003/10/27 09:46:07 mah Exp $
 * Christoph Berg <cb@cs.uni-sb.de>
 *
 * 010811
 */

// instruction formats from [MP00] pg 520
#define OPCODE(x) (((x) >> 26) & 0x3f)
#define RS1(x) (((x) >> 21) & 0x1f)
#define RS2(x) (((x) >> 16) & 0x1f)
#define RD_I(x) (((x) >> 16) & 0x1f)
#define RD_R(x) (((x) >> 11) & 0x1f)
#define SA(x) (((x) >> 6) & 0x1f)
#define FUNC(x) ((x) & 0x3f)
#define IMM_I(x) (((x) << 16) >> 16) // sign-extended
#define IMM_J(x) (((x) << 6) >> 6) // sign-extended
#define FMT_FR(x) (((x) >> 6) & 0x07)

// J type ([MP00] pg 521)
#define OP_J    0x02
#define OP_JAL  0x03
#define OP_TRAP 0x3e
#define OP_RFE  0x3f

// I type ([MP00] pg 523)
#define OP_LB   0x20
#define OP_LH   0x21
#define OP_LW   0x23
#define OP_LBU  0x24
#define OP_LHU  0x25
#define OP_SB   0x28
#define OP_SH   0x29
#define OP_SW   0x2b

#define OP_ADDIO 0x08
#define OP_ADDI  0x09
#define OP_SUBIO 0x0a
#define OP_SUBI  0x0b
#define OVF(x) ((x) & 0x01)

#define OP_ANDI 0x0c
#define OP_ORI  0x0d
#define OP_XORI 0x0e
#define OP_LHGI 0x0f

#define OP_CLRI 0x18
#define OP_SGRI 0x19
#define OP_SEQI 0x1a
#define OP_SGEI 0x1b
#define OP_SLSI 0x1c
#define OP_SNEI 0x1d
#define OP_SLEI 0x1e
#define OP_SETI 0x1f

#define OP_BEQZ 0x04
#define OP_BNEZ 0x05
#define OP_JR   0x16
#define OP_JALR 0x17

// FI type ([MP00] pg 525)
#define OP_LOAD_S  0x31
#define OP_LOAD_D  0x35
#define OP_STORE_S 0x39
#define OP_STORE_D 0x3d
#define OP_FBEQZ   0x06
#define OP_FBNEZ   0x07

// R type ([MP00] pg 522)
#define OP_R 0x00

#define R_SLLI 0x00
#define R_SRLI 0x02
#define R_SRAI 0x03
#define R_SLL  0x04
#define R_SRL  0x06
#define R_SRA  0x07

#define R_ADDO 0x20
#define R_ADD  0x21
#define R_SUBO 0x22
#define R_SUB  0x23
#define R_AND  0x24
#define R_OR   0x25
#define R_XOR  0x26
#define R_LHG  0x27

#define R_CLR 0x28
#define R_SGR 0x29
#define R_SEQ 0x2a
#define R_SGE 0x2b
#define R_SLS 0x2c
#define R_SNE 0x2d
#define R_SLE 0x2e
#define R_SET 0x2f

#define R_MOVS2I 0x10
#define R_MOVI2S 0x11

// FR type ([MP00] pg 526)
#define OP_FR 0x11

#define FR_FADD 0x00
#define FR_FSUB 0x01
#define FR_FMUL 0x02
#define FR_FDIV 0x03
#define FR_FNEG 0x04
#define FR_FABS 0x05
#define FR_FSQT 0x06
#define FR_FREM 0x07

#define FR_FC_CON 0x30
#define FR_FC_CON_MASK 0x30
#define FR_FC_CON_OP(x) (OPCODE(x) & 0x0f)

#define FR_FMOV 0x08
#define FR_MF2I 0x09
#define FR_MI2F 0x0a

#define FR_CVT_S 0x20
#define FR_CVT_D 0x21
#define FR_CVT_I 0x24

#define FMT_S 0x0
#define FMT_D 0x1
#define FMT_I 0x4

#define FR_EQ 0x32 
#define FR_NE 0x3d
#define FR_LT 0x34
#define FR_GT 0x38
#define FR_LE 0x36
#define FR_GE 0x3a