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/* execute.c -- Instruction specific functions.

   Copyright (C) 1999 Damjan Lampret, lampret@opencores.org

                 2000-2002 Marko Mlinar, markom@opencores.org

This file is part of OpenRISC 1000 Architectural Simulator.

This program 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 2 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., 675 Mass Ave, Cambridge, MA 02139, USA. */

INSTRUCTION (l_add) {

  signed long temp1, temp2, temp3;

  signed char temp4;

  IFF (config.cpu.dependstats) current->func_unit = it_arith;

  temp2 = (signed long)eval_operand32(2, &breakpoint);

  temp3 = (signed long)eval_operand32(1, &breakpoint);

  temp1 = temp2 + temp3;

  set_operand32(0, temp1, &breakpoint);

  set_ov_flag (temp1);

  if (ARITH_SET_FLAG) {

    flag = temp1 == 0;

    setsprbits(SPR_SR, SPR_SR_F, flag);

  }

  if ((unsigned long) temp1 < (unsigned long) temp2)

          setsprbits(SPR_SR, SPR_SR_CY, 1);

  else

          setsprbits(SPR_SR, SPR_SR_CY, 0);

  temp4 = temp1;

  if (temp4 == temp1)

    or1k_mstats.byteadd++;

}

INSTRUCTION (l_addc) {

  signed long temp1, temp2, temp3;

  signed char temp4;

  IFF (config.cpu.dependstats) current->func_unit = it_arith;

  temp2 = (signed long)eval_operand32(2, &breakpoint);

  temp3 = (signed long)eval_operand32(1, &breakpoint);

  temp1 = temp2 + temp3 + getsprbits(SPR_SR, SPR_SR_CY);

  set_operand32(0, temp1, &breakpoint);

  set_ov_flag (temp1);

  if (ARITH_SET_FLAG) {

    flag = temp1 == 0;

    setsprbits(SPR_SR, SPR_SR_F, flag);

  }

  if ((unsigned long) temp1 < (unsigned long) temp2)

        setsprbits(SPR_SR, SPR_SR_CY, 1);

  else

        setsprbits(SPR_SR, SPR_SR_CY, 0);

  temp4 = temp1;

  if (temp4 == temp1)

    or1k_mstats.byteadd++;

}

INSTRUCTION (l_sw) {

  int old_cyc = 0;

  IFF (config.cpu.dependstats) current->func_unit = it_store;

  IFF (config.cpu.sbuf_len) old_cyc = runtime.sim.mem_cycles;

  set_operand32(0, eval_operand32(1, &breakpoint), &breakpoint);

  if (config.cpu.sbuf_len) {

    int t = runtime.sim.mem_cycles;

    runtime.sim.mem_cycles = old_cyc;

    sbuf_store (t - old_cyc);

  }

}

INSTRUCTION (l_sb) {

  int old_cyc = 0;

  IFF (config.cpu.dependstats) current->func_unit = it_store;

  IFF (config.cpu.sbuf_len) old_cyc = runtime.sim.mem_cycles;

  set_operand8(0, eval_operand32(1, &breakpoint), &breakpoint);

  if (config.cpu.sbuf_len) {

    int t = runtime.sim.mem_cycles;

    runtime.sim.mem_cycles = old_cyc;

    sbuf_store (t- old_cyc);

  }

}

INSTRUCTION (l_sh) {

  int old_cyc = 0;

  IFF (config.cpu.dependstats) current->func_unit = it_store;

  IFF (config.cpu.sbuf_len) old_cyc = runtime.sim.mem_cycles;

  set_operand16(0, eval_operand32(1, &breakpoint), &breakpoint);

  if (config.cpu.sbuf_len) {

    int t = runtime.sim.mem_cycles;

    runtime.sim.mem_cycles = old_cyc;

    sbuf_store (t - old_cyc);

  }

}

INSTRUCTION (l_lwz) {

  unsigned long val;

  IFF (config.cpu.dependstats) current->func_unit = it_load;

  if (config.cpu.sbuf_len) sbuf_load ();

  val = eval_operand32(1, &breakpoint);

  /* If eval operand produced exception don't set anything */

  if (!pending.valid)

    set_operand32(0, val, &breakpoint);

}

INSTRUCTION (l_lbs) {

  signed char val;

  IFF (config.cpu.dependstats) current->func_unit = it_load;

  if (config.cpu.sbuf_len) sbuf_load ();

  val = eval_operand8(1, &breakpoint);

  /* If eval opreand produced exception don't set anything */

  if (!pending.valid)

    set_operand32(0, val, &breakpoint);

}

INSTRUCTION (l_lbz) {

  unsigned char val;

  IFF (config.cpu.dependstats) current->func_unit = it_load;

  if (config.cpu.sbuf_len) sbuf_load ();

  val = eval_operand8(1, &breakpoint);

  /* If eval opreand produced exception don't set anything */

  if (!pending.valid)

    set_operand32(0, val, &breakpoint);

}

INSTRUCTION (l_lhs) {

  signed short val;

  IFF (config.cpu.dependstats) current->func_unit = it_load;

  if (config.cpu.sbuf_len) sbuf_load ();

  val = eval_operand16(1, &breakpoint);

  /* If eval opreand produced exception don't set anything */

  if (!pending.valid)

    set_operand32(0, val, &breakpoint);

}

INSTRUCTION (l_lhz) {

  unsigned short val;

  IFF (config.cpu.dependstats) current->func_unit = it_load;

  if (config.cpu.sbuf_len) sbuf_load ();

  val = eval_operand16(1, &breakpoint);

  /* If eval opreand produced exception don't set anything */

  if (!pending.valid)

    set_operand32(0, val, &breakpoint);

}

INSTRUCTION (l_movhi) {

  IFF (config.cpu.dependstats) current->func_unit = it_movimm;

  set_operand32(0, eval_operand32(1, &breakpoint) << 16, &breakpoint);

}

INSTRUCTION (l_and) {

  unsigned long temp1;

  IFF (config.cpu.dependstats) current->func_unit = it_arith;

  set_operand32(0, temp1 = set_ov_flag (eval_operand32(1, &breakpoint) & (unsigned)eval_operand32(2, &breakpoint)), &breakpoint);

  if (ARITH_SET_FLAG) {

    flag = temp1 == 0;

    setsprbits(SPR_SR, SPR_SR_F, flag);

  }

}

INSTRUCTION (l_or) {

  IFF (config.cpu.dependstats) current->func_unit = it_arith;

  set_operand32(0, set_ov_flag (eval_operand32(1, &breakpoint) | (unsigned)eval_operand32(2, &breakpoint)), &breakpoint);

}

INSTRUCTION (l_xor) {

  IFF (config.cpu.dependstats) current->func_unit = it_arith;

  set_operand32(0, set_ov_flag (eval_operand32(1, &breakpoint) ^ (signed)eval_operand32(2, &breakpoint)), &breakpoint);

}

INSTRUCTION (l_sub) {

  IFF (config.cpu.dependstats) current->func_unit = it_arith;

  set_operand32(0, set_ov_flag ((signed long)eval_operand32(1, &breakpoint) - (signed long)eval_operand32(2, &breakpoint)), &breakpoint);

}

/*int mcount = 0;*/

INSTRUCTION (l_mul) {

  signed long temp3, temp2, temp1;

  IFF (config.cpu.dependstats) current->func_unit = it_arith;

  set_operand32(0, set_ov_flag ((signed long)eval_operand32(1, &breakpoint) * (signed long)eval_operand32(2, &breakpoint)), &breakpoint);

  /*if (!(mcount++ & 1023)) {

    PRINTF ("[%i]\n",mcount);

    }*/

}

INSTRUCTION (l_div) {

  signed long temp3, temp2, temp1;

  IFF (config.cpu.dependstats) current->func_unit = it_arith;

  temp3 = eval_operand32(2, &breakpoint);

  temp2 = eval_operand32(1, &breakpoint);

  if (temp3)

    temp1 = temp2 / temp3;

  else {

    except_handle(EXCEPT_ILLEGAL, iqueue[0].insn_addr);

    return;

  }

  set_operand32(0, set_ov_flag (temp1), &breakpoint);

}

INSTRUCTION (l_divu) {

  unsigned long temp3, temp2, temp1;

  IFF (config.cpu.dependstats) current->func_unit = it_arith;

  temp3 = eval_operand32(2, &breakpoint);

  temp2 = eval_operand32(1, &breakpoint);

  temp1 = temp2 / temp3;

  /* runtime.sim.cycles += 16; */

  set_operand32(0, set_ov_flag (temp1), &breakpoint);

}

INSTRUCTION (l_sll) {

  int sign = 1;

  IFF (config.cpu.dependstats) current->func_unit = it_shift;

  if ((signed)eval_operand32(1, &breakpoint) < 0)

    sign = -1;

  /* runtime.sim.cycles += 2; */

  set_operand32(0, set_ov_flag (eval_operand32(1, &breakpoint) << eval_operand32(2, &breakpoint)), &breakpoint);

}

INSTRUCTION (l_sra) {

  unsigned long sign = 0;

  IFF (config.cpu.dependstats) current->func_unit = it_shift;

  if ((signed)eval_operand32(1, &breakpoint) < 0)

    sign = -1;

  /* runtime.sim.cycles += 2; */

  set_operand32(0, set_ov_flag ((signed)eval_operand32(1, &breakpoint) >> eval_operand32(2, &breakpoint)), &breakpoint);

}

INSTRUCTION (l_srl) {

  IFF (config.cpu.dependstats) current->func_unit = it_shift;

  /* runtime.sim.cycles += 2; */

  set_operand32(0, set_ov_flag (eval_operand32(1, &breakpoint) >> eval_operand32(2, &breakpoint)), &breakpoint);

}

INSTRUCTION (l_bf) {

  if (config.bpb.enabled) {

    int fwd = (eval_operand32(0, &breakpoint) >= pc) ? 1 : 0;

    IFF (config.cpu.dependstats) current->func_unit = it_branch;

    or1k_mstats.bf[flag][fwd]++;

    bpb_update(current->insn_addr, flag);

  }

  if (flag) {

    pcdelay = pc + (signed)eval_operand32(0, &breakpoint) * 4;

    btic_update(pcnext);

    next_delay_insn = 1;

  } else {

    btic_update(pc);

  }

}

INSTRUCTION (l_bnf) {

  if (config.bpb.enabled) {

    int fwd = (eval_operand32(0, &breakpoint) >= pc) ? 1 : 0;

    IFF (config.cpu.dependstats) current->func_unit = it_branch;

    or1k_mstats.bnf[!flag][fwd]++;

    bpb_update(current->insn_addr, flag == 0);

  }

  if (flag == 0) {

    pcdelay = pc + (signed)eval_operand32(0, &breakpoint) * 4;

    btic_update(pcnext);

    next_delay_insn = 1;

  } else {

    btic_update(pc);

  }

}

INSTRUCTION (l_j) {

  pcdelay = pc + (signed)eval_operand32(0, &breakpoint) * 4;

  IFF (config.cpu.dependstats) current->func_unit = it_jump;

  next_delay_insn = 1;

}

INSTRUCTION (l_jal) {

  pcdelay = pc + (signed)eval_operand32(0, &breakpoint) * 4;

  IFF (config.cpu.dependstats) current->func_unit = it_jump;

  set_reg32(LINK_REGNO, pc + 8);

  next_delay_insn = 1;

  if (config.sim.profile) {

    struct mem_entry *entry;

    struct label_entry *tmp;

    if (verify_memoryarea(pcdelay) && (tmp = get_label (pcdelay)))

      fprintf (runtime.sim.fprof, "+%08X %08X %08X %s\n", runtime.sim.cycles, pc + 8, pcdelay, tmp->name);

    else

      fprintf (runtime.sim.fprof, "+%08X %08X %08X @%08X\n", runtime.sim.cycles, pc + 8, pcdelay, pcdelay);

  }

}

INSTRUCTION (l_jalr) {

  IFF (config.cpu.dependstats) current->func_unit = it_jump;

  pcdelay = eval_operand32(0, &breakpoint);

  set_reg32(LINK_REGNO, pc + 8);

  next_delay_insn = 1;

}

INSTRUCTION (l_jr) {

  IFF (config.cpu.dependstats) current->func_unit = it_jump;

  pcdelay = eval_operand32(0, &breakpoint);

  next_delay_insn = 1;

  if (config.sim.profile)

    fprintf (runtime.sim.fprof, "-%08X %08X\n", runtime.sim.cycles, pcdelay);

}

INSTRUCTION (l_rfe) {

  IFF (config.cpu.dependstats) current->func_unit = it_exception;

  pcnext = mfspr(SPR_EPCR_BASE);

  mtspr(SPR_SR, mfspr(SPR_ESR_BASE));

}

INSTRUCTION (l_nop) {

  unsigned long stackaddr;

  int k = eval_operand32(0, &breakpoint);

  IFF (config.cpu.dependstats) current->func_unit = it_nop;

  switch (k) {

    case NOP_NOP:

      break;

    case NOP_EXIT:

      PRINTF("exit(%d)\n", evalsim_reg32 (3));

      if (config.debug.gdb_enabled)

        set_stall_state (1);

      else

        runtime.sim.cont_run = 0;

      break;

    case NOP_PRINTF:

      stackaddr = evalsim_reg32(4);

      simprintf(stackaddr, evalsim_reg32(3));

      debug(5, "simprintf %x\n", stackaddr);

      break;

    case NOP_REPORT:

      PRINTF("report(0x%x);\n", evalsim_reg32(3));

    default:

      if (k >= NOP_REPORT_FIRST && k <= NOP_REPORT_LAST)

      PRINTF("report %i (0x%x);\n", k - NOP_REPORT_FIRST, evalsim_reg32(3));

      break;

  }

}

INSTRUCTION (l_sfeq) {

  IFF (config.cpu.dependstats) current->func_unit = it_compare;

  flag = eval_operand32(0, &breakpoint) == eval_operand32(1, &breakpoint);

  setsprbits(SPR_SR, SPR_SR_F, flag);

}

INSTRUCTION (l_sfne) {

  IFF (config.cpu.dependstats) current->func_unit = it_compare;

  flag = eval_operand32(0, &breakpoint) != eval_operand32(1, &breakpoint);

  setsprbits(SPR_SR, SPR_SR_F, flag);

}

INSTRUCTION (l_sfgts) {

  IFF (config.cpu.dependstats) current->func_unit = it_compare;

  flag = (signed)eval_operand32(0, &breakpoint) > (signed)eval_operand32(1, &breakpoint);

  setsprbits(SPR_SR, SPR_SR_F, flag);

}

INSTRUCTION (l_sfges) {

  IFF (config.cpu.dependstats) current->func_unit = it_compare;

  flag = (signed)eval_operand32(0, &breakpoint) >= (signed)eval_operand32(1, &breakpoint);

  setsprbits(SPR_SR, SPR_SR_F, flag);

}

INSTRUCTION (l_sflts) {

  IFF (config.cpu.dependstats) current->func_unit = it_compare;

  flag = (signed)eval_operand32(0, &breakpoint) < (signed)eval_operand32(1, &breakpoint);

  setsprbits(SPR_SR, SPR_SR_F, flag);

}

INSTRUCTION (l_sfles) {

  IFF (config.cpu.dependstats) current->func_unit = it_compare;

  flag = (signed)eval_operand32(0, &breakpoint) <= (signed)eval_operand32(1, &breakpoint);

  setsprbits(SPR_SR, SPR_SR_F, flag);

}

INSTRUCTION (l_sfgtu) {

  IFF (config.cpu.dependstats) current->func_unit = it_compare;

  flag = (unsigned)eval_operand32(0, &breakpoint) > (unsigned)eval_operand32(1, &breakpoint);

  setsprbits(SPR_SR, SPR_SR_F, flag);

}

INSTRUCTION (l_sfgeu) {

  IFF (config.cpu.dependstats) current->func_unit = it_compare;

  flag = (unsigned)eval_operand32(0, &breakpoint) >= (unsigned) eval_operand32(1, &breakpoint);

  setsprbits(SPR_SR, SPR_SR_F, flag);

}

INSTRUCTION (l_sfltu) {

  IFF (config.cpu.dependstats) current->func_unit = it_compare;

  flag = (unsigned)eval_operand32(0, &breakpoint) < (unsigned)eval_operand32(1, &breakpoint);

  setsprbits(SPR_SR, SPR_SR_F, flag);

}

INSTRUCTION (l_sfleu) {

  IFF (config.cpu.dependstats) current->func_unit = it_compare;

  flag = (unsigned)eval_operand32(0, &breakpoint) <= (unsigned)eval_operand32(1, &breakpoint);

  setsprbits(SPR_SR, SPR_SR_F, flag);

}

INSTRUCTION (l_extbs) {

  unsigned char x;

  IFF (config.cpu.dependstats) current->func_unit = it_move;

  x = eval_operand32(1, &breakpoint);

  set_operand32(0, (signed long)x, &breakpoint);

}

INSTRUCTION (l_extbz) {

  unsigned char x;

  IFF (config.cpu.dependstats) current->func_unit = it_move;

  x = eval_operand32(1, &breakpoint);

  set_operand32(0, (unsigned long)x, &breakpoint);

}

INSTRUCTION (l_exths) {

  unsigned short x;

  IFF (config.cpu.dependstats) current->func_unit = it_move;

  x = eval_operand32(1, &breakpoint);

  set_operand32(0, (signed long)x, &breakpoint);

}

INSTRUCTION (l_exthz) {

  unsigned short x;

  IFF (config.cpu.dependstats) current->func_unit = it_move;

  x = eval_operand32(1, &breakpoint);

  set_operand32(0, (unsigned long)x, &breakpoint);

}

INSTRUCTION (l_extws) {

  unsigned int x;

  IFF (config.cpu.dependstats) current->func_unit = it_move;

  x = eval_operand32(1, &breakpoint);

  set_operand32(0, (signed long)x, &breakpoint);

}

INSTRUCTION (l_extwz) {

  unsigned int x;

  IFF (config.cpu.dependstats) current->func_unit = it_move;

  x = eval_operand32(1, &breakpoint);

  set_operand32(0, (unsigned long)x, &breakpoint);

}

INSTRUCTION (l_mtspr) {

  unsigned long regno = eval_operand32(0, &breakpoint) + eval_operand32(2, &breakpoint);

  unsigned long value = eval_operand32(1, &breakpoint);

  if (runtime.sim.fspr_log) {

    fprintf(runtime.sim.fspr_log, "Write to SPR  : [%08lX] <- [%08lX]\n", regno, value);

  }

  IFF (config.cpu.dependstats) current->func_unit = it_move;

  if (mfspr(SPR_SR) & SPR_SR_SM)

    mtspr(regno, value);

  else {

    PRINTF("WARNING: trying to write SPR while SR[SUPV] is cleared.\n");

    runtime.sim.cont_run = 0;

  }

}

INSTRUCTION (l_mfspr) {

  unsigned long regno = eval_operand32(1, &breakpoint) + eval_operand32(2, &breakpoint);

  unsigned long value = mfspr(regno);

  if (runtime.sim.fspr_log) {

    fprintf(runtime.sim.fspr_log, "Read from SPR : [%08lX] -> [%08lX]\n", regno, value);

  }

  IFF (config.cpu.dependstats) current->func_unit = it_move;

  if (mfspr(SPR_SR) & SPR_SR_SM)

    set_operand32(0, value, &breakpoint);

  else {

    set_operand32(0, 0, &breakpoint);

    PRINTF("WARNING: trying to read SPR while SR[SUPV] is cleared.\n");

    runtime.sim.cont_run = 0;

  }

}

INSTRUCTION (l_sys) {

  except_handle(EXCEPT_SYSCALL, mfspr(SPR_EEAR_BASE));

}

INSTRUCTION (l_trap) {

  /* TODO: some SR related code here! */

  except_handle(EXCEPT_TRAP, mfspr(SPR_EEAR_BASE));

}

INSTRUCTION (l_mac) {

  sprword lo, hi;

  LONGEST l;

  long x, y;

  IFF (config.cpu.dependstats) current->func_unit = it_mac;

  lo = mfspr (SPR_MACLO);

  hi = mfspr (SPR_MACHI);

  x = eval_operand32(0, &breakpoint);

  y = eval_operand32(1, &breakpoint);

  PRINTF ("[%08x,%08x]\t", (unsigned long)(x), (unsigned long)(y));

  l = (ULONGEST)lo | ((LONGEST)hi << 32);

  l += (LONGEST) x * (LONGEST) y;

  /* This implementation is very fast - it needs only one cycle for mac.  */

  lo = ((ULONGEST)l) & 0xFFFFFFFF;

  hi = ((LONGEST)l) >> 32;

  mtspr (SPR_MACLO, lo);

  mtspr (SPR_MACHI, hi);

  PRINTF ("(%08x,%08x)\n", hi, lo);

}

INSTRUCTION (l_msb) {

  sprword lo, hi;

  LONGEST l;

  long x, y;

  IFF (config.cpu.dependstats) current->func_unit = it_mac;

  lo = mfspr (SPR_MACLO);

  hi = mfspr (SPR_MACHI);

  x = eval_operand32(0, &breakpoint);

  y = eval_operand32(1, &breakpoint);

  PRINTF ("[%08x,%08x]\t", (unsigned long)(x), (unsigned long)(y));

  l = (ULONGEST)lo | ((LONGEST)hi << 32);

  l -= (LONGEST) eval_operand32(0, &breakpoint) * (LONGEST)eval_operand32(1, &breakpoint);

  /* This implementation is very fast - it needs only one cycle for msb.  */

  lo = ((ULONGEST)l) & 0xFFFFFFFF;

  hi = ((LONGEST)l) >> 32;

  mtspr (SPR_MACLO, lo);

  mtspr (SPR_MACHI, hi);

  PRINTF ("(%08x,%08x)\n", hi, lo);

}

INSTRUCTION (l_macrc) {

  sprword lo, hi;

  LONGEST l;

  IFF (config.cpu.dependstats) current->func_unit = it_mac;

  /* No need for synchronization here -- all MAC instructions are 1 cycle long.  */

  lo =  mfspr (SPR_MACLO);

  hi =  mfspr (SPR_MACHI);

  l = (ULONGEST) lo | ((LONGEST)hi << 32);

  l >>= 28;

  //PRINTF ("<%08x>\n", (unsigned long)l);

  set_operand32(0, (long)l, &breakpoint);

  mtspr (SPR_MACLO, 0);

  mtspr (SPR_MACHI, 0);

}

INSTRUCTION (l_cmov) {

  IFF (config.cpu.dependstats) current->func_unit = it_move;

  set_operand32(0, flag ? eval_operand32(1, &breakpoint) : eval_operand32(2, &breakpoint), &breakpoint);

}

/******* Floating point instructions *******/

/* Single precision */

INSTRUCTION (lf_add_s) {

  IFF (config.cpu.dependstats) current->func_unit = it_float;

  set_operand32(0, (machword)((float)eval_operand32(1, &breakpoint) + (float)eval_operand32(2, &breakpoint)), &breakpoint);

}

INSTRUCTION (lf_div_s) {

  IFF (config.cpu.dependstats) current->func_unit = it_float;

  set_operand32(0, (machword)((float)eval_operand32(1, &breakpoint) / (float)eval_operand32(2, &breakpoint)), &breakpoint);

}

INSTRUCTION (lf_ftoi_s) {

  IFF (config.cpu.dependstats) current->func_unit = it_float;

//  set_operand32(0, freg[get_operand(1)], &breakpoint);

}

INSTRUCTION (lf_itof_s) {

  IFF (config.cpu.dependstats) current->func_unit = it_float;

//  freg[get_operand(0)] = eval_operand32(1, &breakpoint);

}

INSTRUCTION (lf_madd_s) {

  IFF (config.cpu.dependstats) current->func_unit = it_float;

  set_operand32(0, (machword)((float)eval_operand32(0, &breakpoint) + (float)eval_operand32(1, &breakpoint) * (float)eval_operand32(2, &breakpoint)), &breakpoint);

}