// -*- C -*-

// Simulator definition for the MIPS 32/64 revision 2 instructions.
// Copyright (C) 2004-2021 Free Software Foundation, Inc.
// Contributed by David Ung, of MIPS Technologies.
//
// This file is part of the MIPS sim.
// 
// 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 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, see <http://www.gnu.org/licenses/>.

:function:::void:do_dsbh:int rd, int rt
{
  union { unsigned64 d; unsigned16 h[4]; } u;
  TRACE_ALU_INPUT1 (GPR[rt]);
  u.d = GPR[rt];
  u.h[0] = SWAP_2 (u.h[0]);
  u.h[1] = SWAP_2 (u.h[1]);
  u.h[2] = SWAP_2 (u.h[2]);
  u.h[3] = SWAP_2 (u.h[3]);
  GPR[rd] = u.d;
  TRACE_ALU_RESULT1 (GPR[rd]);
}

:function:::void:do_dshd:int rd, int rt
{
  unsigned64 d;
  TRACE_ALU_INPUT1 (GPR[rt]);
  d = GPR[rt];
  GPR[rd] = ((d >> 48)
	     | (d << 48)
	     | ((d & 0x0000ffff00000000ULL) >> 16)
	     | ((d & 0x00000000ffff0000ULL) << 16));
  TRACE_ALU_RESULT1 (GPR[rd]);
}

:function:::void:do_dext:int rt, int rs, int lsb, int size
{
  TRACE_ALU_INPUT3 (GPR[rs], lsb, size);
  GPR[rt] = EXTRACTED64 (GPR[rs], lsb + size, lsb);
  TRACE_ALU_RESULT1 (GPR[rt]);
}

:function:::void:do_dextm:int rt, int rs, int lsb, int size
{
  TRACE_ALU_INPUT3 (GPR[rs], lsb, size);
  GPR[rt] = EXTRACTED64 (GPR[rs], lsb + size + 32, lsb);
  TRACE_ALU_RESULT1 (GPR[rt]);
}

:function:::void:do_dextu:int rt, int rs, int lsb, int size
{
  TRACE_ALU_INPUT3 (GPR[rs], lsb, size);
  GPR[rt] = EXTRACTED64 (GPR[rs], lsb + 32 + size, lsb + 32);
  TRACE_ALU_RESULT1 (GPR[rt]);
}

:function:::void:do_di:int rt
{
  TRACE_ALU_INPUT0 ();
  GPR[rt] = EXTEND32 (SR);
  SR &= ~status_IE;
  TRACE_ALU_RESULT1 (GPR[rt]);
}

:function:::void:do_dins:int rt, int rs, int lsb, int msb
{
  TRACE_ALU_INPUT4 (GPR[rt], GPR[rs], lsb, msb);
  if (lsb <= msb)
    GPR[rt] ^= (GPR[rt] ^ (GPR[rs] << lsb)) & MASK64 (msb, lsb);
  TRACE_ALU_RESULT1 (GPR[rt]);
}

:function:::void:do_dinsm:int rt, int rs, int lsb, int msb
{
  TRACE_ALU_INPUT4 (GPR[rt], GPR[rs], lsb, msb);
  if (lsb <= msb + 32)
    GPR[rt] ^= (GPR[rt] ^ (GPR[rs] << lsb)) & MASK64 (msb + 32, lsb);
  TRACE_ALU_RESULT1 (GPR[rt]);
}

:function:::void:do_ei:int rt
{
  TRACE_ALU_INPUT0 ();
  GPR[rt] = EXTEND32 (SR);
  SR |= status_IE;
  TRACE_ALU_RESULT1 (GPR[rt]);
}

:function:::void:do_ext:int rt, int rs, int lsb, int size
{
  TRACE_ALU_INPUT3 (GPR[rs], lsb, size);
  GPR[rt] = EXTEND32 (EXTRACTED32 (GPR[rs], lsb + size, lsb));
  TRACE_ALU_RESULT1 (GPR[rt]);
}

:function:::void:do_mfhc1:int rt, int fs
{
  check_fpu (SD_);
  if (SizeFGR() == 64)
    GPR[rt] = EXTEND32 (WORD64HI (FGR[fs]));
  else if ((fs & 0x1) == 0)
    GPR[rt] = EXTEND32 (FGR[fs + 1]);
  else
    {
      if (STATE_VERBOSE_P(SD))
	sim_io_eprintf (SD,
	         "Warning: PC 0x%lx: MFHC1 32-bit use of odd FPR number\n",
			(long) CIA);
      GPR[rt] = EXTEND32 (0xBADF00D);
    }
  TRACE_ALU_RESULT (GPR[rt]);
}

:function:::void:do_mthc1:int rt, int fs
{
  check_fpu (SD_);
  if (SizeFGR() == 64)
    StoreFPR (fs, fmt_uninterpreted_64, SET64HI (GPR[rt]) | VL4_8 (FGR[fs]));
  else if ((fs & 0x1) == 0)
    StoreFPR (fs + 1, fmt_uninterpreted_32, VL4_8 (GPR[rt]));
  else
    {
      if (STATE_VERBOSE_P(SD))
	sim_io_eprintf (SD,
	         "Warning: PC 0x%lx: MTHC1 32-bit use of odd FPR number\n",
			(long) CIA);
      StoreFPR (fs, fmt_uninterpreted_32, 0xDEADC0DE);
    }
  TRACE_FP_RESULT (GPR[rt]);
}

:function:::void:do_ins:int rt, int rs, int lsb, int msb
{
  TRACE_ALU_INPUT4 (GPR[rt], GPR[rs], lsb, msb);
  if (lsb <= msb)
    GPR[rt] = EXTEND32 (GPR[rt] ^
			((GPR[rt] ^ (GPR[rs] << lsb)) & MASK32 (msb, lsb)));
  TRACE_ALU_RESULT1 (GPR[rt]);
}

:function:::void:do_dinsu:int rt, int rs, int lsb, int msb
{
  TRACE_ALU_INPUT4 (GPR[rt], GPR[rs], lsb, msb);
  if (lsb <= msb)
    GPR[rt] ^= (GPR[rt] ^ (GPR[rs] << (lsb + 32)))
      & MASK64 (msb + 32, lsb + 32);
  TRACE_ALU_RESULT1 (GPR[rt]);
}

:function:::void:do_seb:int rd, int rt
{
  TRACE_ALU_INPUT1 (GPR[rt]);
  GPR[rd] = EXTEND8 (GPR[rt]);
  TRACE_ALU_RESULT1 (GPR[rd]);
}

:function:::void:do_seh:int rd, int rt
{
  TRACE_ALU_INPUT1 (GPR[rt]);
  GPR[rd] = EXTEND16 (GPR[rt]);
  TRACE_ALU_RESULT1 (GPR[rd]);
}

:function:::void:do_rdhwr:int rt, int rd
{
  // Return 0 for all hardware registers currently
  GPR[rt] = EXTEND32 (0);
  TRACE_ALU_RESULT1 (GPR[rt]);
}

:function:::void:do_wsbh:int rd, int rt
{
  union { unsigned32 w; unsigned16 h[2]; } u;
  TRACE_ALU_INPUT1 (GPR[rt]);
  u.w = GPR[rt];
  u.h[0] = SWAP_2 (u.h[0]);
  u.h[1] = SWAP_2 (u.h[1]);
  GPR[rd] = EXTEND32 (u.w);
  TRACE_ALU_RESULT1 (GPR[rd]);
}

011111,5.RS,5.RT,5.SIZE,5.LSB,000011::64::DEXT
"dext r<RT>, r<RS>, <LSB>, <SIZE+1>"
*mips64r2:
{
  check_u64 (SD_, instruction_0);
  do_dext (SD_, RT, RS, LSB, SIZE);
}

011111,5.RS,5.RT,5.SIZE,5.LSB,000001::64::DEXTM
"dextm r<RT>, r<RS>, <LSB>, <SIZE+33>"
*mips64r2:
{
  check_u64 (SD_, instruction_0);
  do_dextm (SD_, RT, RS, LSB, SIZE);
}

011111,5.RS,5.RT,5.SIZE,5.LSB,000010::64::DEXTU
"dextu r<RT>, r<RS>, <LSB+32>, <SIZE+1>"
*mips64r2:
{
  check_u64 (SD_, instruction_0);
  do_dextu (SD_, RT, RS, LSB, SIZE);
}


010000,01011,5.RT,01100,00000,0,00,000::32::DI
"di":RT == 0
"di r<RT>"
*mips32r2:
*mips64r2:
{
  do_di (SD_, RT);
}


011111,5.RS,5.RT,5.MSB,5.LSB,000111::64::DINS
"dins r<RT>, r<RS>, <LSB>, <MSB-LSB+1>"
*mips64r2:
{
  check_u64 (SD_, instruction_0);
  do_dins (SD_, RT, RS, LSB, MSB);
}

011111,5.RS,5.RT,5.MSB,5.LSB,000101::64::DINSM
"dinsm r<RT>, r<RS>, <LSB>, <MSB+32-LSB+1>"
*mips64r2:
{
  check_u64 (SD_, instruction_0);
  do_dinsm (SD_, RT, RS, LSB, MSB);
}

011111,5.RS,5.RT,5.MSB,5.LSB,000110::64::DINSU
"dinsu r<RT>, r<RS>, <LSB+32>, <MSB-LSB+1>"
*mips64r2:
{
  check_u64 (SD_, instruction_0);
  do_dinsu (SD_, RT, RS, LSB, MSB);
}


011111,00000,5.RT,5.RD,00010,100100::64::DSBH
"dsbh r<RD>, r<RT>"
*mips64r2:
{
  check_u64 (SD_, instruction_0);
  do_dsbh (SD_, RD, RT);
}

011111,00000,5.RT,5.RD,00101,100100::64::DSHD
"dshd r<RD>, r<RT>"
*mips64r2:
{
  check_u64 (SD_, instruction_0);
  do_dshd (SD_, RD, RT);
}

010000,01011,5.RT,01100,00000,1,00,000::32::EI
"ei":RT == 0
"ei r<RT>"
*mips32r2:
*mips64r2:
{
  do_ei (SD_, RT);
}


011111,5.RS,5.RT,5.SIZE,5.LSB,000000::32::EXT
"ext r<RT>, r<RS>, <LSB>, <SIZE+1>"
*mips32r2:
*mips64r2:
{
  do_ext (SD_, RT, RS, LSB, SIZE);
}


010001,00011,5.RT,5.FS,00000000000:COP1Sa:32,f::MFHC1
"mfhc1 r<RT>, f<FS>"
*mips32r2:
*mips64r2:
{
  do_mfhc1 (SD_, RT, FS);
}

010001,00111,5.RT,5.FS,00000000000:COP1Sa:32,f::MTHC1
"mthc1 r<RT>, f<FS>"
*mips32r2:
*mips64r2:
{
  do_mthc1 (SD_, RT, FS);
}


011111,5.RS,5.RT,5.MSB,5.LSB,000100::32::INS
"ins r<RT>, r<RS>, <LSB>, <MSB-LSB+1>"
*mips32r2:
*mips64r2:
{
  do_ins (SD_, RT, RS, LSB, MSB);
}


011111,00000,5.RT,5.RD,10000,100000::32::SEB
"seb r<RD>, r<RT>"
*mips32r2:
*mips64r2:
{
  do_seb (SD_, RD, RT);
}

011111,00000,5.RT,5.RD,11000,100000::32::SEH
"seh r<RD>, r<RT>"
*mips32r2:
*mips64r2:
{
  do_seh (SD_, RD, RT);
}


000001,5.BASE,11111,16.OFFSET::32::SYNCI
"synci <OFFSET>(r<BASE>)"
*mips32r2:
*mips64r2:
{
  // sync i-cache - nothing to do currently
}


011111,00000,5.RT,5.RD,00000,111011::32::RDHWR
"rdhwr r<RT>, r<RD>"
*mips32r2:
*mips64r2:
{
  do_rdhwr (SD_, RT, RD);
}


011111,00000,5.RT,5.RD,00010,100000::32::WSBH
"wsbh r<RD>, r<RT>"
*mips32r2:
*mips64r2:
{
  do_wsbh (SD_, RD, RT);
}