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/* Copyright 2009, 2010 Free Software Foundation, Inc.

   This file is part of the Xilinx MicroBlaze simulator.

   This library 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 3 of the License, or
   (at your option) any later version.

   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.

   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.  */

/*
 *  MICROBLAZE Instruction Set Architecture
 *
 *  INSTRUCTION(NAME,
 *              OPCODE,
 *              TYPE,
 *              SEMANTICS)
 *
 */

INSTRUCTION(add,
            0x00,
            INST_TYPE_RD_RA_RB,
            CARRY = C_calc(RA, RB, 0);
            RD = RA + RB;
            C_wr(CARRY);
            PC += INST_SIZE)

INSTRUCTION(rsub,
            0x01,
            INST_TYPE_RD_RA_RB, 
            CARRY = C_calc(RB, ~RA, 1);
            RD = RB + ~RA + 1;
            C_wr(CARRY);
            PC += INST_SIZE)

INSTRUCTION(addc,
            0x02,
            INST_TYPE_RD_RA_RB,
            CARRY = C_calc(RA, RB, C_rd);
            RD = RA + RB + C_rd;
            C_wr(CARRY);
            PC += INST_SIZE)

INSTRUCTION(rsubc,
            0x03,
            INST_TYPE_RD_RA_RB,
            CARRY = C_calc(RB, ~RA, C_rd);
            RD = RB + ~RA + C_rd;
            C_wr(CARRY);
            PC += INST_SIZE)

INSTRUCTION(addk,
            0x04,
            INST_TYPE_RD_RA_RB,
            RD = RA + RB;
            PC += INST_SIZE)

INSTRUCTION(rsubk,
            0x05,
            INST_TYPE_RD_RA_RB,
            RD = RB + ~RA + 1;
            PC += INST_SIZE)

INSTRUCTION(cmp,
            0x05,
            INST_TYPE_RD_RA_RB,
            {
              int tmp_reg = RB + ~RA + 1;
              if ((RB & 0x80000000) ^ (RA & 0x80000000)) {
                tmp_reg = ((tmp_reg & 0x7fffffff) | (RB & 0x80000000));
              }
              RD = tmp_reg;
              PC += INST_SIZE;
            })

INSTRUCTION(cmpu,
            0x05,
            INST_TYPE_RD_RA_RB,
            {
              int tmp_reg = RB + ~RA + 1;
              if ((RB & 0x80000000) ^ (RA & 0x80000000)) {
                tmp_reg = ((tmp_reg & 0x7fffffff) | (RA & 0x80000000));
              }
              RD = tmp_reg;
              PC += INST_SIZE;
            })

INSTRUCTION(addkc,
            0x06,
            INST_TYPE_RD_RA_RB,
            RD = RA + RB + C_rd;
            PC += INST_SIZE)

INSTRUCTION(rsubkc,
            0x07,
            INST_TYPE_RD_RA_RB,
            RD = RB + ~RA + C_rd;
            PC += INST_SIZE)

INSTRUCTION(addi,
            0x08,
            INST_TYPE_RD_RA_IMM,
            CARRY = C_calc(RA, IMM, 0);
            RD = RA + IMM;
            C_wr(CARRY);
            PC += INST_SIZE)

INSTRUCTION(rsubi,
            0x09,
            INST_TYPE_RD_RA_IMM,
            CARRY = C_calc(IMM, ~RA, 1);
            RD = IMM + ~RA + 1;
            C_wr(CARRY);
            PC += INST_SIZE)

INSTRUCTION(addic,
            0x0A,
            INST_TYPE_RD_RA_IMM,
            CARRY = C_calc(RA, IMM, C_rd);
            RD = RA + IMM + C_rd;
            C_wr(CARRY);
            PC += INST_SIZE)

INSTRUCTION(rsubic,
            0x0B,
            INST_TYPE_RD_RA_IMM,
            CARRY = C_calc(IMM, ~RA, C_rd);
            RD = IMM + ~RA + C_rd;
            C_wr(CARRY);
            PC += INST_SIZE)

INSTRUCTION(addik,
            0x0C,
            INST_TYPE_RD_RA_IMM,
            RD = RA + IMM;
            PC += INST_SIZE)

INSTRUCTION(rsubik,
            0x0D,
            INST_TYPE_RD_RA_IMM,
            RD = IMM + ~RA + 1;
            PC += INST_SIZE)

INSTRUCTION(addikc,
            0x0E,
            INST_TYPE_RD_RA_IMM,
            RD = RA + IMM + C_rd;
            PC += INST_SIZE)

INSTRUCTION(rsubikc,
            0x0F,
            INST_TYPE_RD_RA_IMM,
            RD = IMM + ~RA + C_rd;
            PC += INST_SIZE)

INSTRUCTION(mul,
            0x10,
            INST_TYPE_RD_RA_RB, 
            RD = RA * RB;
            PC += INST_SIZE)

INSTRUCTION(bsrl,
            0x11,
            INST_TYPE_RD_RA_RB,
            RD = (uword)RA >> RB;
            PC += INST_SIZE)

INSTRUCTION(bsra,
            0x11,
            INST_TYPE_RD_RA_RB,
            RD = (word)RA >> RB;
            PC += INST_SIZE)

INSTRUCTION(bsll,
            0x11,
            INST_TYPE_RD_RA_RB,
            RD = (uword)RA << RB;
            PC += INST_SIZE)

INSTRUCTION(idiv,
            0x12,
            INST_TYPE_RD_RA_RB,
            RD = (word) RB / (word) RA;
            PC += INST_SIZE)

INSTRUCTION(idivu,
            0x12,
            INST_TYPE_RD_RA_RB,
            RD = (uword) RB / (uword) RA;
            PC += INST_SIZE)

INSTRUCTION(muli,
            0x18,
            INST_TYPE_RD_RA_IMM,
            RD = RA * IMM;
            PC += INST_SIZE)

INSTRUCTION(bsrli,
            0x19,
            INST_TYPE_RD_RA_IMM5,
            RD = (uword)RA >> (IMM & 0x1F);
            PC += INST_SIZE)

INSTRUCTION(bsrai,
            0x19,
            INST_TYPE_RD_RA_IMM5,
            RD = (word)RA >> (IMM & 0x1F);
            PC += INST_SIZE)

INSTRUCTION(bslli,
            0x19,
            INST_TYPE_RD_RA_IMM5,
            RD = (uword)RA << (IMM & 0x1F);
            PC += INST_SIZE)

INSTRUCTION(get,
            0x1b,
            INST_TYPE_RD_IMM12,
            PC += INST_SIZE)

INSTRUCTION(put,
            0x1b,
            INST_TYPE_R1_IMM12,
            PC += INST_SIZE)

INSTRUCTION(nget,
            0x1b,
            INST_TYPE_RD_IMM12,
            PC += INST_SIZE)

INSTRUCTION(nput,
            0x1b,
            INST_TYPE_R1_IMM12,
            PC += INST_SIZE)

INSTRUCTION(cget,
            0x1b,
            INST_TYPE_RD_IMM12,
            PC += INST_SIZE)

INSTRUCTION(cput,
            0x1b,
            INST_TYPE_R1_IMM12,
            PC += INST_SIZE)

INSTRUCTION(ncget,
            0x1b,
            INST_TYPE_RD_IMM12,
            PC += INST_SIZE)

INSTRUCTION(ncput,
            0x1b,
            INST_TYPE_R1_IMM12,
            PC += INST_SIZE) 

INSTRUCTION(or,
            0x20,
            INST_TYPE_RD_RA_RB,
            RD = RA | RB;
            PC += INST_SIZE)

INSTRUCTION(and,
            0x21,
            INST_TYPE_RD_RA_RB,
            RD = RA & RB;
            PC += INST_SIZE)

INSTRUCTION(xor,
            0x22,
            INST_TYPE_RD_RA_RB,
            RD = RA ^ RB;
            PC += INST_SIZE)

INSTRUCTION(andn,
            0x23,
            INST_TYPE_RD_RA_RB,
            RD = RA & ~RB;
            PC += INST_SIZE)

INSTRUCTION(sra,
            0x24,
            INST_TYPE_RD_RA,
            CARRY = (RA & 0x1);
            RD = (int) (RA >> 1);
            C_wr(CARRY);
            PC += INST_SIZE)

INSTRUCTION(src,
            0x24,
            INST_TYPE_RD_RA,
            CARRY = (RA & 0x1);
            RD = ((((int) (RA >> 1)) & 0x7FFFFFFF) | (uword)(C_rd << 31));
            C_wr(CARRY);
            PC += INST_SIZE)

INSTRUCTION(srl,
            0x24,
            INST_TYPE_RD_RA,
            CARRY = (RA & 0x1);
            RD = (uword) ((RA >> 1) & 0x7FFFFFFF);
            C_wr(CARRY);
            PC += INST_SIZE)

INSTRUCTION(sext8,
            0x24,
            INST_TYPE_RD_RA,
            RD = MICROBLAZE_SEXT8(RA);
            PC += INST_SIZE)

INSTRUCTION(sext16,
            0x24,
            INST_TYPE_RD_RA,
            RD = MICROBLAZE_SEXT16(RA);
            PC += INST_SIZE)

INSTRUCTION(wdc,
            0x24,
            INST_TYPE_RA_RB,
            PC += INST_SIZE)

INSTRUCTION(wic,
            0x24,
            INST_TYPE_RA_RB,
            PC += INST_SIZE)

INSTRUCTION(mts,
            0x25,
            INST_TYPE_SA_RA,
            SA = RA;
            PC += INST_SIZE)

INSTRUCTION(mfs,
            0x25,
            INST_TYPE_RD_SA,
            RD = SA;
            PC += INST_SIZE)

INSTRUCTION(br,
            0x26,
            INST_TYPE_RB,
            PC += RB;
            BRANCH)

INSTRUCTION(brd,
            0x26,
            INST_TYPE_RB,
            PC += RB;
            BRANCH;
            DELAY_SLOT)

INSTRUCTION(brld,
            0x26,
            INST_TYPE_RD_RB,
            RD = PC;
            PC += RB;
            BRANCH;
            DELAY_SLOT)

INSTRUCTION(bra,
            0x26,
            INST_TYPE_RB,
            PC = RB;
            BRANCH)

INSTRUCTION(brad,
            0x26,
            INST_TYPE_RB,
            PC = RB;
            BRANCH;
            DELAY_SLOT)

INSTRUCTION(brald,
            0x26,
            INST_TYPE_RD_RB,
            RD = PC;
            PC = RB;
            BRANCH;
            DELAY_SLOT)

INSTRUCTION(microblaze_brk,
            0x26,
            INST_TYPE_RD_RB,
            RD = PC;
            PC = RB;
            MSR = MSR | BIP_MASK;
            BRANCH)

INSTRUCTION(beq,
            0x27,
            INST_TYPE_RA_RB,
            if (RA == 0) {
              PC += RB;
              BRANCH;
            } else {
              PC += INST_SIZE;
            })

INSTRUCTION(beqd,
            0x27,
            INST_TYPE_RA_RB,
            if (RA == 0) {
              PC += RB;
              BRANCH;
            } else {
              PC += INST_SIZE;
            }
            DELAY_SLOT)

INSTRUCTION(bne,
            0x27,
            INST_TYPE_RA_RB,
            if (RA != 0) {
              PC += RB;
              BRANCH;
            } else {
              PC += INST_SIZE;
            })

INSTRUCTION(bned,
            0x27,
            INST_TYPE_RA_RB,
            if (RA != 0) {
              PC += RB;
              BRANCH;
            } else {
              PC += INST_SIZE;
            }
            DELAY_SLOT)

INSTRUCTION(blt,
            0x27,
            INST_TYPE_RA_RB,
            if (RA < 0) {
              PC += RB;
              BRANCH;
            } else {
              PC += INST_SIZE;
            })

INSTRUCTION(bltd,
            0x27,
            INST_TYPE_RA_RB,
            if (RA < 0) {
              PC += RB;
              BRANCH;
            } else {
              PC += INST_SIZE;
            }
            DELAY_SLOT)

INSTRUCTION(ble,
            0x27,
            INST_TYPE_RA_RB,
            if (RA <= 0) {
              PC += RB;
              BRANCH;
            } else {
              PC += INST_SIZE;
            })

INSTRUCTION(bled,
            0x27,
            INST_TYPE_RA_RB,
            if (RA <= 0) {
              PC += RB;
              BRANCH;
            } else {
              PC += INST_SIZE;
            }
            DELAY_SLOT)

INSTRUCTION(bgt,
            0x27,
            INST_TYPE_RA_RB,
            if (RA > 0) {
              PC += RB;
              BRANCH;
            } else {
              PC += INST_SIZE;
            })

INSTRUCTION(bgtd,
            0x27,
            INST_TYPE_RA_RB,
            if (RA > 0) {
              PC += RB;
              BRANCH;
            } else {
              PC += INST_SIZE;
            }
            DELAY_SLOT)

INSTRUCTION(bge,
            0x27,
            INST_TYPE_RA_RB,
            if (RA >= 0) {
              PC += RB;
              BRANCH;
            } else {
              PC += INST_SIZE;
            })

INSTRUCTION(bged,
            0x27,
            INST_TYPE_RA_RB,
            if (RA >= 0) {
              PC += RB;
              BRANCH;
            } else {
              PC += INST_SIZE;
            }
            DELAY_SLOT)

INSTRUCTION(ori,
            0x28,
            INST_TYPE_RD_RA_IMM,
            RD = RA | IMM;
            PC += INST_SIZE)

INSTRUCTION(andi,
            0x29,
            INST_TYPE_RD_RA_IMM,
            RD = RA & IMM;
            PC += INST_SIZE)

INSTRUCTION(xori,
            0x2A,
            INST_TYPE_RD_RA_IMM,
            RD = RA ^ IMM;
            PC += INST_SIZE)

INSTRUCTION(andni,
            0x2B,
            INST_TYPE_RD_RA_IMM,
            RD = RA & ~IMM;
            PC += INST_SIZE)

INSTRUCTION(imm,
            0x2C,
            INST_TYPE_IMM,
            IMM_H = IMM_L;
            PC += INST_SIZE)

INSTRUCTION(rtsd,
            0x2D,
            INST_TYPE_RA_IMM,
            PC = RA + IMM;
            BRANCH;
            DELAY_SLOT)

INSTRUCTION(rtid,
            0x2D,
            INST_TYPE_RA_IMM,
            PC = RA + IMM;
            MSR = MSR | INTR_EN_MASK;
            BRANCH;
            DELAY_SLOT)

INSTRUCTION(rtbd,
            0x2D,
            INST_TYPE_RA_IMM,
            PC = RA + IMM;
            MSR = MSR & ~BIP_MASK;
            BRANCH;
            DELAY_SLOT;)

INSTRUCTION(bri,
            0x2E,
            INST_TYPE_IMM,
            PC += IMM;
            BRANCH)

INSTRUCTION(brid,
            0x2E,
            INST_TYPE_IMM,
            PC += IMM;
            BRANCH;
            DELAY_SLOT)

INSTRUCTION(brlid,
            0x2E,
            INST_TYPE_RD_IMM,
            RD = PC;
            PC += IMM;
            BRANCH;
            DELAY_SLOT)

INSTRUCTION(brai,
            0x2E,
            INST_TYPE_IMM,
            PC = IMM;
            BRANCH)

INSTRUCTION(braid,
            0x2E,
            INST_TYPE_IMM,
            PC = IMM;
            BRANCH;
            DELAY_SLOT)

INSTRUCTION(bralid,
            0x2E,
            INST_TYPE_RD_IMM,
            RD = PC;
            PC = IMM;
            BRANCH;
            DELAY_SLOT)

INSTRUCTION(brki,
            0x2E,
            INST_TYPE_RD_IMM,
            RD = PC;
            PC = IMM;
            MSR = MSR | BIP_MASK;
            BRANCH)

INSTRUCTION(beqi,
            0x2F,
            INST_TYPE_RA_IMM,
            if (RA == 0) {
              PC += IMM;
              BRANCH;
            } else {
              PC += INST_SIZE;
            })

INSTRUCTION(beqid,
            0x2F,
            INST_TYPE_RA_IMM,
            if (RA == 0) {
              PC += IMM;
              BRANCH;
            } else {
              PC += INST_SIZE;
            }
            DELAY_SLOT)

INSTRUCTION(bnei,
            0x2F,
            INST_TYPE_RA_IMM,
            if (RA != 0) {
              PC += IMM;
              BRANCH;
            } else {
              PC += INST_SIZE;
            })

INSTRUCTION(bneid,
            0x2F,
            INST_TYPE_RA_IMM,
            if (RA != 0) {
              PC += IMM;
              BRANCH;
            } else {
              PC += INST_SIZE;
            }
            DELAY_SLOT)

INSTRUCTION(blti,
            0x2F,
            INST_TYPE_RA_IMM,
            if (RA < 0) {
              PC += IMM;
              BRANCH;
            } else {
              PC += INST_SIZE;
            })

INSTRUCTION(bltid,
            0x2F,
            INST_TYPE_RA_IMM,
            if (RA < 0) {
              PC += IMM;
              BRANCH;
            } else {
              PC += INST_SIZE;
            }
            DELAY_SLOT)

INSTRUCTION(blei,
            0x2F,
            INST_TYPE_RA_IMM,
            if (RA <= 0) {
              PC += IMM;
              BRANCH;
            } else {
              PC += INST_SIZE;
            })

INSTRUCTION(bleid,
            0x2F,
            INST_TYPE_RA_IMM,
            if (RA <= 0) {
              PC += IMM;
              BRANCH;
            } else {
              PC += INST_SIZE;
            }
            DELAY_SLOT)

INSTRUCTION(bgti,
            0x2F,
            INST_TYPE_RA_IMM,
            if (RA > 0) {
              PC += IMM;
              BRANCH;
            } else {
              PC += INST_SIZE;
            })

INSTRUCTION(bgtid,
            0x2F,
            INST_TYPE_RA_IMM,
            if (RA > 0) {
              PC += IMM;
              BRANCH;
            } else {
              PC += INST_SIZE;
            }
            DELAY_SLOT)

INSTRUCTION(bgei,
            0x2F,
            INST_TYPE_RA_IMM,
            if (RA >= 0) {
              PC += IMM;
              BRANCH;
            } else {
              PC += INST_SIZE;
            })

INSTRUCTION(bgeid,
            0x2F,
            INST_TYPE_RA_IMM,
            if (RA >= 0) {
              PC += IMM;
              BRANCH;
            } else {
              PC += INST_SIZE;
            }
            DELAY_SLOT)

INSTRUCTION(lbu,
            0x30,
            INST_TYPE_RD_RA_RB,
            RD = (MEM_RD_UBYTE(RA + RB));
            PC += INST_SIZE)

INSTRUCTION(lhu,
            0x31,
            INST_TYPE_RD_RA_RB,
            RD = (MEM_RD_UHALF((RA + RB) & ~0x1));
            PC += INST_SIZE)

INSTRUCTION(lw,
            0x32,
            INST_TYPE_RD_RA_RB, 
            RD = (MEM_RD_WORD((RA + RB) & ~0x3));
            PC += INST_SIZE)

INSTRUCTION(sb,
            0x34,
            INST_TYPE_RD_RA_RB,
            MEM_WR_BYTE(RA + RB, RD);
            PC += INST_SIZE)

INSTRUCTION(sh,
            0x35,
            INST_TYPE_RD_RA_RB,
            MEM_WR_HALF((RA + RB) & ~0x1, RD);
            PC += INST_SIZE)

INSTRUCTION(sw,
            0x36,
            INST_TYPE_RD_RA_RB,
            MEM_WR_WORD((RA + RB) & ~0x3, RD);
            PC += INST_SIZE)

INSTRUCTION(lbui,
            0x38,
            INST_TYPE_RD_RA_IMM,
            RD = (MEM_RD_UBYTE(RA + IMM));
            PC += INST_SIZE)

INSTRUCTION(lhui,
            0x39,
            INST_TYPE_RD_RA_IMM,
            RD = (MEM_RD_UHALF((RA+IMM) & ~0x1));
            PC += INST_SIZE)

INSTRUCTION(lwi,
            0x3A,
            INST_TYPE_RD_RA_IMM, 
            RD = (MEM_RD_WORD((RA+IMM) & ~0x3));
            PC += INST_SIZE)

INSTRUCTION(sbi,
            0x3C,
            INST_TYPE_RD_RA_IMM,
            MEM_WR_BYTE(RA + IMM, RD);
            PC += INST_SIZE)

INSTRUCTION(shi,
            0x3D,
            INST_TYPE_RD_RA_IMM,
            MEM_WR_HALF((RA + IMM) & ~0x1, RD);
            PC += INST_SIZE)

INSTRUCTION(swi,
            0x3E,
            INST_TYPE_RD_RA_IMM,
            MEM_WR_WORD((RA + IMM) & ~0x3, RD);
            PC += INST_SIZE)