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/*  maverick.c -- Cirrus/DSP co-processor interface.
    Copyright (C) 2003, 2007, 2008 Free Software Foundation, Inc.
    Contributed by Aldy Hernandez (aldyh@redhat.com).
 
    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/>. */
 
#include <assert.h>
#include "armdefs.h"
#include "ansidecl.h"
#include "armemu.h"
 
/*#define CIRRUS_DEBUG 1        /**/
#if CIRRUS_DEBUG
#  define printfdbg printf
#else
#  define printfdbg printf_nothing
#endif
 
#define POS64(i) ( (~(i)) >> 63 )
#define NEG64(i) ( (i) >> 63 )
 
/* Define Co-Processor instruction handlers here.  */
 
/* Here's ARMulator's DSP definition.  A few things to note:
   1) it has 16 64-bit registers and 4 72-bit accumulators
   2) you can only access its registers with MCR and MRC.  */
 
/* We can't define these in here because this file might not be linked
   unless the target is arm9e-*.  They are defined in wrapper.c.
   Eventually the simulator should be made to handle any coprocessor
   at run time.  */
struct maverick_regs
{
  union
  {
    int i;
    float f;
  } upper;
 
  union
  {
    int i;
    float f;
  } lower;
};
 
union maverick_acc_regs
{
  long double ld;               /* Acc registers are 72-bits.  */
};
 
struct maverick_regs DSPregs[16];
union maverick_acc_regs DSPacc[4];
ARMword DSPsc;
 
#define DEST_REG        (BITS (12, 15))
#define SRC1_REG        (BITS (16, 19))
#define SRC2_REG        (BITS (0, 3))
 
static int lsw_int_index, msw_int_index;
static int lsw_float_index, msw_float_index;
 
static double mv_getRegDouble (int);
static long long mv_getReg64int (int);
static void mv_setRegDouble (int, double val);
static void mv_setReg64int (int, long long val);
 
static union
{
  double d;
  long long ll;
  int ints[2];
} reg_conv;
 
static void
printf_nothing (void * foo, ...)
{
}
 
static void
cirrus_not_implemented (char * insn)
{
  fprintf (stderr, "Cirrus instruction '%s' not implemented.\n", insn);
  fprintf (stderr, "aborting!\n");
 
  exit (1);
}
 
static unsigned
DSPInit (ARMul_State * state)
{
  ARMul_ConsolePrint (state, ", DSP present");
  return TRUE;
}
 
unsigned
DSPMRC4 (ARMul_State * state ATTRIBUTE_UNUSED,
         unsigned      type  ATTRIBUTE_UNUSED,
         ARMword       instr,
         ARMword *     value)
{
  switch (BITS (5, 7))
    {
    case 0: /* cfmvrdl */
      /* Move lower half of a DF stored in a DSP reg into an Arm reg.  */
      printfdbg ("cfmvrdl\n");
      printfdbg ("\tlower half=0x%x\n", DSPregs[SRC1_REG].lower.i);
      printfdbg ("\tentire thing=%g\n", mv_getRegDouble (SRC1_REG));
 
      *value = (ARMword) DSPregs[SRC1_REG].lower.i;
      break;
 
    case 1: /* cfmvrdh */
      /* Move upper half of a DF stored in a DSP reg into an Arm reg.  */
      printfdbg ("cfmvrdh\n");
      printfdbg ("\tupper half=0x%x\n", DSPregs[SRC1_REG].upper.i);
      printfdbg ("\tentire thing=%g\n", mv_getRegDouble (SRC1_REG));
 
      *value = (ARMword) DSPregs[SRC1_REG].upper.i;
      break;
 
    case 2: /* cfmvrs */
      /* Move SF from upper half of a DSP register to an Arm register.  */
      *value = (ARMword) DSPregs[SRC1_REG].upper.i;
      printfdbg ("cfmvrs = mvf%d <-- %f\n",
                 SRC1_REG,
                 DSPregs[SRC1_REG].upper.f);
      break;
 
#ifdef doesnt_work
    case 4: /* cfcmps */
      {
        float a, b;
        int n, z, c, v;
 
        a = DSPregs[SRC1_REG].upper.f;
        b = DSPregs[SRC2_REG].upper.f;
 
        printfdbg ("cfcmps\n");
        printfdbg ("\tcomparing %f and %f\n", a, b);
 
        z = a == b;             /* zero */
        n = a != b;             /* negative */
        v = a > b;              /* overflow */
        c = 0;                   /* carry */
        *value = (n << 31) | (z << 30) | (c << 29) | (v << 28);
        break;
      }
 
    case 5: /* cfcmpd */
      {
        double a, b;
        int n, z, c, v;
 
        a = mv_getRegDouble (SRC1_REG);
        b = mv_getRegDouble (SRC2_REG);
 
        printfdbg ("cfcmpd\n");
        printfdbg ("\tcomparing %g and %g\n", a, b);
 
        z = a == b;             /* zero */
        n = a != b;             /* negative */
        v = a > b;              /* overflow */
        c = 0;                   /* carry */
        *value = (n << 31) | (z << 30) | (c << 29) | (v << 28);
        break;
      }
#else
      case 4: /* cfcmps */
        {
          float a, b;
          int n, z, c, v;
 
          a = DSPregs[SRC1_REG].upper.f;
          b = DSPregs[SRC2_REG].upper.f;
 
          printfdbg ("cfcmps\n");
          printfdbg ("\tcomparing %f and %f\n", a, b);
 
          z = a == b;           /* zero */
          n = a < b;            /* negative */
          c = a > b;            /* carry */
          v = 0;         /* fixme */
          printfdbg ("\tz = %d, n = %d\n", z, n);
          *value = (n << 31) | (z << 30) | (c << 29) | (v << 28);
          break;
        }
 
      case 5: /* cfcmpd */
        {
          double a, b;
          int n, z, c, v;
 
          a = mv_getRegDouble (SRC1_REG);
          b = mv_getRegDouble (SRC2_REG);
 
          printfdbg ("cfcmpd\n");
          printfdbg ("\tcomparing %g and %g\n", a, b);
 
          z = a == b;           /* zero */
          n = a < b;            /* negative */
          c = a > b;            /* carry */
          v = 0;         /* fixme */
          *value = (n << 31) | (z << 30) | (c << 29) | (v << 28);
          break;
        }
#endif
    default:
      fprintf (stderr, "unknown opcode in DSPMRC4 0x%x\n", instr);
      cirrus_not_implemented ("unknown");
      break;
    }
 
  return ARMul_DONE;
}
 
unsigned
DSPMRC5 (ARMul_State * state ATTRIBUTE_UNUSED,
         unsigned      type  ATTRIBUTE_UNUSED,
         ARMword       instr,
         ARMword *     value)
{
  switch (BITS (5, 7))
    {
    case 0: /* cfmvr64l */
      /* Move lower half of 64bit int from Cirrus to Arm.  */
      *value = (ARMword) DSPregs[SRC1_REG].lower.i;
      printfdbg ("cfmvr64l ARM_REG = mvfx%d <-- %d\n",
                 DEST_REG,
                 (int) *value);
      break;
 
    case 1: /* cfmvr64h */
      /* Move upper half of 64bit int from Cirrus to Arm.  */
      *value = (ARMword) DSPregs[SRC1_REG].upper.i;
      printfdbg ("cfmvr64h <-- %d\n", (int) *value);
      break;
 
    case 4: /* cfcmp32 */
      {
        int res;
        int n, z, c, v;
        unsigned int a, b;
 
        printfdbg ("cfcmp32 mvfx%d - mvfx%d\n",
                   SRC1_REG,
                   SRC2_REG);
 
        /* FIXME: see comment for cfcmps.  */
        a = DSPregs[SRC1_REG].lower.i;
        b = DSPregs[SRC2_REG].lower.i;
 
        res = DSPregs[SRC1_REG].lower.i - DSPregs[SRC2_REG].lower.i;
        /* zero */
        z = res == 0;
        /* negative */
        n = res < 0;
        /* overflow */
        v = SubOverflow (DSPregs[SRC1_REG].lower.i, DSPregs[SRC2_REG].lower.i,
                         res);
        /* carry */
        c = (NEG (a) && POS (b) ||
             (NEG (a) && POS (res)) || (POS (b) && POS (res)));
 
        *value = (n << 31) | (z << 30) | (c << 29) | (v << 28);
        break;
      }
 
    case 5: /* cfcmp64 */
      {
        long long res;
        int n, z, c, v;
        unsigned long long a, b;
 
        printfdbg ("cfcmp64 mvdx%d - mvdx%d\n",
                   SRC1_REG,
                   SRC2_REG);
 
        /* fixme: see comment for cfcmps.  */
 
        a = mv_getReg64int (SRC1_REG);
        b = mv_getReg64int (SRC2_REG);
 
        res = mv_getReg64int (SRC1_REG) - mv_getReg64int (SRC2_REG);
        /* zero */
        z = res == 0;
        /* negative */
        n = res < 0;
        /* overflow */
        v = ((NEG64 (a) && POS64 (b) && POS64 (res))
             || (POS64 (a) && NEG64 (b) && NEG64 (res)));
        /* carry */
        c = (NEG64 (a) && POS64 (b) ||
             (NEG64 (a) && POS64 (res)) || (POS64 (b) && POS64 (res)));
 
        *value = (n << 31) | (z << 30) | (c << 29) | (v << 28);
        break;
      }
 
    default:
      fprintf (stderr, "unknown opcode in DSPMRC5 0x%x\n", instr);
      cirrus_not_implemented ("unknown");
      break;
    }
 
  return ARMul_DONE;
}
 
unsigned
DSPMRC6 (ARMul_State * state ATTRIBUTE_UNUSED,
         unsigned      type  ATTRIBUTE_UNUSED,
         ARMword       instr,
         ARMword *     value)
{
  switch (BITS (5, 7))
    {
    case 0: /* cfmval32 */
      cirrus_not_implemented ("cfmval32");
      break;
 
    case 1: /* cfmvam32 */
      cirrus_not_implemented ("cfmvam32");
      break;
 
    case 2: /* cfmvah32 */
      cirrus_not_implemented ("cfmvah32");
      break;
 
    case 3: /* cfmva32 */
      cirrus_not_implemented ("cfmva32");
      break;
 
    case 4: /* cfmva64 */
      cirrus_not_implemented ("cfmva64");
      break;
 
    case 5: /* cfmvsc32 */
      cirrus_not_implemented ("cfmvsc32");
      break;
 
    default:
      fprintf (stderr, "unknown opcode in DSPMRC6 0x%x\n", instr);
      cirrus_not_implemented ("unknown");
      break;
    }
 
  return ARMul_DONE;
}
 
unsigned
DSPMCR4 (ARMul_State * state,
         unsigned      type ATTRIBUTE_UNUSED,
         ARMword       instr,
         ARMword       value)
{
  switch (BITS (5, 7))
    {
    case 0: /* cfmvdlr */
      /* Move the lower half of a DF value from an Arm register into
         the lower half of a Cirrus register.  */
      printfdbg ("cfmvdlr <-- 0x%x\n", (int) value);
      DSPregs[SRC1_REG].lower.i = (int) value;
      break;
 
    case 1: /* cfmvdhr */
      /* Move the upper half of a DF value from an Arm register into
         the upper half of a Cirrus register.  */
      printfdbg ("cfmvdhr <-- 0x%x\n", (int) value);
      DSPregs[SRC1_REG].upper.i = (int) value;
      break;
 
    case 2: /* cfmvsr */
      /* Move SF from Arm register into upper half of Cirrus register.  */
      printfdbg ("cfmvsr <-- 0x%x\n", (int) value);
      DSPregs[SRC1_REG].upper.i = (int) value;
      break;
 
    default:
      fprintf (stderr, "unknown opcode in DSPMCR4 0x%x\n", instr);
      cirrus_not_implemented ("unknown");
      break;
    }
 
  return ARMul_DONE;
}
 
unsigned
DSPMCR5 (ARMul_State * state,
         unsigned      type   ATTRIBUTE_UNUSED,
         ARMword       instr,
         ARMword       value)
{
  union
  {
    int s;
    unsigned int us;
  } val;
 
  switch (BITS (5, 7))
    {
    case 0: /* cfmv64lr */
      /* Move lower half of a 64bit int from an ARM register into the
         lower half of a DSP register and sign extend it.  */
      printfdbg ("cfmv64lr mvdx%d <-- 0x%x\n", SRC1_REG, (int) value);
      DSPregs[SRC1_REG].lower.i = (int) value;
      break;
 
    case 1: /* cfmv64hr */
      /* Move upper half of a 64bit int from an ARM register into the
         upper half of a DSP register.  */
      printfdbg ("cfmv64hr ARM_REG = mvfx%d <-- 0x%x\n",
                 SRC1_REG,
                 (int) value);
      DSPregs[SRC1_REG].upper.i = (int) value;
      break;
 
    case 2: /* cfrshl32 */
      printfdbg ("cfrshl32\n");
      val.us = value;
      if (val.s > 0)
        DSPregs[SRC2_REG].lower.i = DSPregs[SRC1_REG].lower.i << value;
      else
        DSPregs[SRC2_REG].lower.i = DSPregs[SRC1_REG].lower.i >> -value;
      break;
 
    case 3: /* cfrshl64 */
      printfdbg ("cfrshl64\n");
      val.us = value;
      if (val.s > 0)
        mv_setReg64int (SRC2_REG, mv_getReg64int (SRC1_REG) << value);
      else
        mv_setReg64int (SRC2_REG, mv_getReg64int (SRC1_REG) >> -value);
      break;
 
    default:
      fprintf (stderr, "unknown opcode in DSPMCR5 0x%x\n", instr);
      cirrus_not_implemented ("unknown");
      break;
    }
 
  return ARMul_DONE;
}
 
unsigned
DSPMCR6 (ARMul_State * state,
         unsigned      type   ATTRIBUTE_UNUSED,
         ARMword       instr,
         ARMword       value)
{
  switch (BITS (5, 7))
    {
    case 0: /* cfmv32al */
      cirrus_not_implemented ("cfmv32al");
      break;
 
    case 1: /* cfmv32am */
      cirrus_not_implemented ("cfmv32am");
      break;
 
    case 2: /* cfmv32ah */
      cirrus_not_implemented ("cfmv32ah");
      break;
 
    case 3: /* cfmv32a */
      cirrus_not_implemented ("cfmv32a");
      break;
 
    case 4: /* cfmv64a */
      cirrus_not_implemented ("cfmv64a");
      break;
 
    case 5: /* cfmv32sc */
      cirrus_not_implemented ("cfmv32sc");
      break;
 
    default:
      fprintf (stderr, "unknown opcode in DSPMCR6 0x%x\n", instr);
      cirrus_not_implemented ("unknown");
      break;
    }
 
  return ARMul_DONE;
}
 
unsigned
DSPLDC4 (ARMul_State * state ATTRIBUTE_UNUSED,
         unsigned      type,
         ARMword       instr,
         ARMword       data)
{
  static unsigned words;
 
  if (type != ARMul_DATA)
    {
      words = 0;
      return ARMul_DONE;
    }
 
  if (BIT (22))
    {                           /* it's a long access, get two words */
      /* cfldrd */
 
      printfdbg ("cfldrd: %x (words = %d) (bigend = %d) DESTREG = %d\n",
                 data, words, state->bigendSig, DEST_REG);
 
      if (words == 0)
        {
          if (state->bigendSig)
            DSPregs[DEST_REG].upper.i = (int) data;
          else
            DSPregs[DEST_REG].lower.i = (int) data;
        }
      else
        {
          if (state->bigendSig)
            DSPregs[DEST_REG].lower.i = (int) data;
          else
            DSPregs[DEST_REG].upper.i = (int) data;
        }
 
      ++ words;
 
      if (words == 2)
        {
          printfdbg ("\tmvd%d <-- mem = %g\n", DEST_REG,
                     mv_getRegDouble (DEST_REG));
 
          return ARMul_DONE;
        }
      else
        return ARMul_INC;
    }
  else
    {
      /* Get just one word.  */
 
      /* cfldrs */
      printfdbg ("cfldrs\n");
 
      DSPregs[DEST_REG].upper.i = (int) data;
 
      printfdbg ("\tmvf%d <-- mem = %f\n", DEST_REG,
                 DSPregs[DEST_REG].upper.f);
 
      return ARMul_DONE;
    }
}
 
unsigned
DSPLDC5 (ARMul_State * state ATTRIBUTE_UNUSED,
         unsigned      type,
         ARMword       instr,
         ARMword       data)
{
  static unsigned words;
 
  if (type != ARMul_DATA)
    {
      words = 0;
      return ARMul_DONE;
    }
 
  if (BIT (22))
    {
      /* It's a long access, get two words.  */
 
      /* cfldr64 */
      printfdbg ("cfldr64: %d\n", data);
 
      if (words == 0)
        {
          if (state->bigendSig)
            DSPregs[DEST_REG].upper.i = (int) data;
          else
            DSPregs[DEST_REG].lower.i = (int) data;
        }
      else
        {
          if (state->bigendSig)
            DSPregs[DEST_REG].lower.i = (int) data;
          else
            DSPregs[DEST_REG].upper.i = (int) data;
        }
 
      ++ words;
 
      if (words == 2)
        {
          printfdbg ("\tmvdx%d <-- mem = %lld\n", DEST_REG,
                     mv_getReg64int (DEST_REG));
 
          return ARMul_DONE;
        }
      else
        return ARMul_INC;
    }
  else
    {
      /* Get just one word.  */
 
      /* cfldr32 */
      printfdbg ("cfldr32 mvfx%d <-- %d\n", DEST_REG, (int) data);
 
      /* 32bit ints should be sign extended to 64bits when loaded.  */
      mv_setReg64int (DEST_REG, (long long) data);
 
      return ARMul_DONE;
    }
}
 
unsigned
DSPSTC4 (ARMul_State * state ATTRIBUTE_UNUSED,
         unsigned      type,
         ARMword       instr,
         ARMword *     data)
{
  static unsigned words;
 
  if (type != ARMul_DATA)
    {
      words = 0;
      return ARMul_DONE;
    }
 
  if (BIT (22))
    {
      /* It's a long access, get two words.  */
      /* cfstrd */
      printfdbg ("cfstrd\n");
 
      if (words == 0)
        {
          if (state->bigendSig)
            *data = (ARMword) DSPregs[DEST_REG].upper.i;
          else
            *data = (ARMword) DSPregs[DEST_REG].lower.i;
        }
      else
        {
          if (state->bigendSig)
            *data = (ARMword) DSPregs[DEST_REG].lower.i;
          else
            *data = (ARMword) DSPregs[DEST_REG].upper.i;
        }
 
      ++ words;
 
      if (words == 2)
        {
          printfdbg ("\tmem = mvd%d = %g\n", DEST_REG,
                     mv_getRegDouble (DEST_REG));
 
          return ARMul_DONE;
        }
      else
        return ARMul_INC;
    }
  else
    {
      /* Get just one word.  */
      /* cfstrs */
      printfdbg ("cfstrs mvf%d <-- %f\n", DEST_REG,
                 DSPregs[DEST_REG].upper.f);
 
      *data = (ARMword) DSPregs[DEST_REG].upper.i;
 
      return ARMul_DONE;
    }
}
 
unsigned
DSPSTC5 (ARMul_State * state ATTRIBUTE_UNUSED,
         unsigned      type,
         ARMword       instr,
         ARMword *     data)
{
  static unsigned words;
 
  if (type != ARMul_DATA)
    {
      words = 0;
      return ARMul_DONE;
    }
 
  if (BIT (22))
    {
      /* It's a long access, store two words.  */
      /* cfstr64 */
      printfdbg ("cfstr64\n");
 
      if (words == 0)
        {
          if (state->bigendSig)
            *data = (ARMword) DSPregs[DEST_REG].upper.i;
          else
            *data = (ARMword) DSPregs[DEST_REG].lower.i;
        }
      else
        {
          if (state->bigendSig)
            *data = (ARMword) DSPregs[DEST_REG].lower.i;
          else
            *data = (ARMword) DSPregs[DEST_REG].upper.i;
        }
 
      ++ words;
 
      if (words == 2)
        {
          printfdbg ("\tmem = mvd%d = %lld\n", DEST_REG,
                     mv_getReg64int (DEST_REG));
 
          return ARMul_DONE;
        }
      else
        return ARMul_INC;
    }
  else
    {
      /* Store just one word.  */
      /* cfstr32 */
      *data = (ARMword) DSPregs[DEST_REG].lower.i;
 
      printfdbg ("cfstr32 MEM = %d\n", (int) *data);
 
      return ARMul_DONE;
    }
}
 
unsigned
DSPCDP4 (ARMul_State * state,
         unsigned      type,
         ARMword       instr)
{
  int opcode2;
 
  opcode2 = BITS (5,7);
 
  switch (BITS (20,21))
    {
    case 0:
      switch (opcode2)
        {
        case 0: /* cfcpys */
          printfdbg ("cfcpys mvf%d = mvf%d = %f\n",
                     DEST_REG,
                     SRC1_REG,
                     DSPregs[SRC1_REG].upper.f);
          DSPregs[DEST_REG].upper.f = DSPregs[SRC1_REG].upper.f;
          break;
 
        case 1: /* cfcpyd */
          printfdbg ("cfcpyd mvd%d = mvd%d = %g\n",
                     DEST_REG,
                     SRC1_REG,
                     mv_getRegDouble (SRC1_REG));
          mv_setRegDouble (DEST_REG, mv_getRegDouble (SRC1_REG));
          break;
 
        case 2: /* cfcvtds */
          printfdbg ("cfcvtds mvf%d = (float) mvd%d = %f\n",
                     DEST_REG,
                     SRC1_REG,
                     (float) mv_getRegDouble (SRC1_REG));
          DSPregs[DEST_REG].upper.f = (float) mv_getRegDouble (SRC1_REG);
          break;
 
        case 3: /* cfcvtsd */
          printfdbg ("cfcvtsd mvd%d = mvf%d = %g\n",
                     DEST_REG,
                     SRC1_REG,
                     (double) DSPregs[SRC1_REG].upper.f);
          mv_setRegDouble (DEST_REG, (double) DSPregs[SRC1_REG].upper.f);
          break;
 
        case 4: /* cfcvt32s */
          printfdbg ("cfcvt32s mvf%d = mvfx%d = %f\n",
                     DEST_REG,
                     SRC1_REG,
                     (float) DSPregs[SRC1_REG].lower.i);
          DSPregs[DEST_REG].upper.f = (float) DSPregs[SRC1_REG].lower.i;
          break;
 
        case 5: /* cfcvt32d */
          printfdbg ("cfcvt32d mvd%d = mvfx%d = %g\n",
                     DEST_REG,
                     SRC1_REG,
                     (double) DSPregs[SRC1_REG].lower.i);
          mv_setRegDouble (DEST_REG, (double) DSPregs[SRC1_REG].lower.i);
          break;
 
        case 6: /* cfcvt64s */
          printfdbg ("cfcvt64s mvf%d = mvdx%d = %f\n",
                     DEST_REG,
                     SRC1_REG,
                     (float) mv_getReg64int (SRC1_REG));
          DSPregs[DEST_REG].upper.f = (float) mv_getReg64int (SRC1_REG);
          break;
 
        case 7: /* cfcvt64d */
          printfdbg ("cfcvt64d mvd%d = mvdx%d = %g\n",
                     DEST_REG,
                     SRC1_REG,
                     (double) mv_getReg64int (SRC1_REG));
          mv_setRegDouble (DEST_REG, (double) mv_getReg64int (SRC1_REG));
          break;
        }
      break;
 
    case 1:
      switch (opcode2)
        {
        case 0: /* cfmuls */
          printfdbg ("cfmuls mvf%d = mvf%d = %f\n",
                     DEST_REG,
                     SRC1_REG,
                     DSPregs[SRC1_REG].upper.f * DSPregs[SRC2_REG].upper.f);
 
          DSPregs[DEST_REG].upper.f = DSPregs[SRC1_REG].upper.f
            * DSPregs[SRC2_REG].upper.f;
          break;
 
        case 1: /* cfmuld */
          printfdbg ("cfmuld mvd%d = mvd%d = %g\n",
                     DEST_REG,
                     SRC1_REG,
                     mv_getRegDouble (SRC1_REG) * mv_getRegDouble (SRC2_REG));
 
          mv_setRegDouble (DEST_REG,
                           mv_getRegDouble (SRC1_REG)
                           * mv_getRegDouble (SRC2_REG));
          break;
 
        default:
          fprintf (stderr, "unknown opcode in DSPCDP4 0x%x\n", instr);
          cirrus_not_implemented ("unknown");
          break;
        }
      break;
 
    case 3:
      switch (opcode2)
        {
        case 0: /* cfabss */
          DSPregs[DEST_REG].upper.f = (DSPregs[SRC1_REG].upper.f < 0.0F ?
                                       -DSPregs[SRC1_REG].upper.f
                                       : DSPregs[SRC1_REG].upper.f);
          printfdbg ("cfabss mvf%d = |mvf%d| = %f\n",
                     DEST_REG,
                     SRC1_REG,
                     DSPregs[DEST_REG].upper.f);
          break;
 
        case 1: /* cfabsd */
          mv_setRegDouble (DEST_REG,
                           (mv_getRegDouble (SRC1_REG) < 0.0 ?
                            -mv_getRegDouble (SRC1_REG)
                            : mv_getRegDouble (SRC1_REG)));
          printfdbg ("cfabsd mvd%d = |mvd%d| = %g\n",
                     DEST_REG,
                     SRC1_REG,
                     mv_getRegDouble (DEST_REG));
          break;
 
        case 2: /* cfnegs */
          DSPregs[DEST_REG].upper.f = -DSPregs[SRC1_REG].upper.f;
          printfdbg ("cfnegs mvf%d = -mvf%d = %f\n",
                     DEST_REG,
                     SRC1_REG,
                     DSPregs[DEST_REG].upper.f);
          break;
 
        case 3: /* cfnegd */
          mv_setRegDouble (DEST_REG,
                           -mv_getRegDouble (SRC1_REG));
          printfdbg ("cfnegd mvd%d = -mvd%d = %g\n",
                     DEST_REG,
                     mv_getRegDouble (DEST_REG));
          break;
 
        case 4: /* cfadds */
          DSPregs[DEST_REG].upper.f = DSPregs[SRC1_REG].upper.f
            + DSPregs[SRC2_REG].upper.f;
          printfdbg ("cfadds mvf%d = mvf%d + mvf%d = %f\n",
                     DEST_REG,
                     SRC1_REG,
                     SRC2_REG,
                     DSPregs[DEST_REG].upper.f);
          break;
 
        case 5: /* cfaddd */
          mv_setRegDouble (DEST_REG,
                           mv_getRegDouble (SRC1_REG)
                           + mv_getRegDouble (SRC2_REG));
          printfdbg ("cfaddd: mvd%d = mvd%d + mvd%d = %g\n",
                     DEST_REG,
                     SRC1_REG,
                     SRC2_REG,
                     mv_getRegDouble (DEST_REG));
          break;
 
        case 6: /* cfsubs */
          DSPregs[DEST_REG].upper.f = DSPregs[SRC1_REG].upper.f
            - DSPregs[SRC2_REG].upper.f;
          printfdbg ("cfsubs: mvf%d = mvf%d - mvf%d = %f\n",
                     DEST_REG,
                     SRC1_REG,
                     SRC2_REG,
                     DSPregs[DEST_REG].upper.f);
          break;
 
        case 7: /* cfsubd */
          mv_setRegDouble (DEST_REG,
                           mv_getRegDouble (SRC1_REG)
                           - mv_getRegDouble (SRC2_REG));
          printfdbg ("cfsubd: mvd%d = mvd%d - mvd%d = %g\n",
                     DEST_REG,
                     SRC1_REG,
                     SRC2_REG,
                     mv_getRegDouble (DEST_REG));
          break;
        }
      break;
 
    default:
      fprintf (stderr, "unknown opcode in DSPCDP4 0x%x\n", instr);
      cirrus_not_implemented ("unknown");
      break;
    }
 
  return ARMul_DONE;
}
 
unsigned
DSPCDP5 (ARMul_State * state,
         unsigned      type,
         ARMword       instr)
{
   int opcode2;
   char shift;
 
   opcode2 = BITS (5,7);
 
   /* Shift constants are 7bit signed numbers in bits 0..3|5..7.  */
   shift = BITS (0, 3) | (BITS (5, 7)) << 4;
   if (shift & 0x40)
     shift |= 0xc0;
 
   switch (BITS (20,21))
     {
     case 0:
       /* cfsh32 */
       printfdbg ("cfsh32 %s amount=%d\n", shift < 0 ? "right" : "left",
                  shift);
       if (shift < 0)
         /* Negative shift is a right shift.  */
         DSPregs[DEST_REG].lower.i = DSPregs[SRC1_REG].lower.i >> -shift;
       else
         /* Positive shift is a left shift.  */
         DSPregs[DEST_REG].lower.i = DSPregs[SRC1_REG].lower.i << shift;
       break;
 
     case 1:
       switch (opcode2)
         {
         case 0: /* cfmul32 */
           DSPregs[DEST_REG].lower.i = DSPregs[SRC1_REG].lower.i
             * DSPregs[SRC2_REG].lower.i;
           printfdbg ("cfmul32 mvfx%d = mvfx%d * mvfx%d = %d\n",
                      DEST_REG,
                      SRC1_REG,
                      SRC2_REG,
                      DSPregs[DEST_REG].lower.i);
           break;
 
         case 1: /* cfmul64 */
           mv_setReg64int (DEST_REG,
                           mv_getReg64int (SRC1_REG)
                           * mv_getReg64int (SRC2_REG));
           printfdbg ("cfmul64 mvdx%d = mvdx%d * mvdx%d = %lld\n",
                      DEST_REG,
                      SRC1_REG,
                      SRC2_REG,
                      mv_getReg64int (DEST_REG));
           break;
 
         case 2: /* cfmac32 */
           DSPregs[DEST_REG].lower.i
             += DSPregs[SRC1_REG].lower.i * DSPregs[SRC2_REG].lower.i;
           printfdbg ("cfmac32 mvfx%d += mvfx%d * mvfx%d = %d\n",
                      DEST_REG,
                      SRC1_REG,
                      SRC2_REG,
                      DSPregs[DEST_REG].lower.i);
           break;
 
         case 3: /* cfmsc32 */
           DSPregs[DEST_REG].lower.i
             -= DSPregs[SRC1_REG].lower.i * DSPregs[SRC2_REG].lower.i;
           printfdbg ("cfmsc32 mvfx%d -= mvfx%d * mvfx%d = %d\n",
                      DEST_REG,
                      SRC1_REG,
                      SRC2_REG,
                      DSPregs[DEST_REG].lower.i);
           break;
 
         case 4: /* cfcvts32 */
           /* fixme: this should round */
           DSPregs[DEST_REG].lower.i = (int) DSPregs[SRC1_REG].upper.f;
           printfdbg ("cfcvts32 mvfx%d = mvf%d = %d\n",
                      DEST_REG,
                      SRC1_REG,
                      DSPregs[DEST_REG].lower.i);
           break;
 
         case 5: /* cfcvtd32 */
           /* fixme: this should round */
           DSPregs[DEST_REG].lower.i = (int) mv_getRegDouble (SRC1_REG);
           printfdbg ("cfcvtd32 mvdx%d = mvd%d = %d\n",
                      DEST_REG,
                      SRC1_REG,
                      DSPregs[DEST_REG].lower.i);
           break;
 
         case 6: /* cftruncs32 */
           DSPregs[DEST_REG].lower.i = (int) DSPregs[SRC1_REG].upper.f;
           printfdbg ("cftruncs32 mvfx%d = mvf%d = %d\n",
                      DEST_REG,
                      SRC1_REG,
                      DSPregs[DEST_REG].lower.i);
           break;
 
         case 7: /* cftruncd32 */
           DSPregs[DEST_REG].lower.i = (int) mv_getRegDouble (SRC1_REG);
           printfdbg ("cftruncd32 mvfx%d = mvd%d = %d\n",
                      DEST_REG,
                      SRC1_REG,
                      DSPregs[DEST_REG].lower.i);
           break;
         }
       break;
 
     case 2:
       /* cfsh64 */
       printfdbg ("cfsh64\n");
 
       if (shift < 0)
         /* Negative shift is a right shift.  */
         mv_setReg64int (DEST_REG,
                         mv_getReg64int (SRC1_REG) >> -shift);
       else
         /* Positive shift is a left shift.  */
         mv_setReg64int (DEST_REG,
                         mv_getReg64int (SRC1_REG) << shift);
       printfdbg ("\t%llx\n", mv_getReg64int(DEST_REG));
       break;
 
     case 3:
       switch (opcode2)
         {
         case 0: /* cfabs32 */
           DSPregs[DEST_REG].lower.i = (DSPregs[SRC1_REG].lower.i < 0
             ? -DSPregs[SRC1_REG].lower.i : DSPregs[SRC1_REG].lower.i);
           printfdbg ("cfabs32 mvfx%d = |mvfx%d| = %d\n",
                      DEST_REG,
                      SRC1_REG,
                      SRC2_REG,
                      DSPregs[DEST_REG].lower.i);
           break;
 
         case 1: /* cfabs64 */
           mv_setReg64int (DEST_REG,
                           (mv_getReg64int (SRC1_REG) < 0
                            ? -mv_getReg64int (SRC1_REG)
                            : mv_getReg64int (SRC1_REG)));
           printfdbg ("cfabs64 mvdx%d = |mvdx%d| = %lld\n",
                      DEST_REG,
                      SRC1_REG,
                      SRC2_REG,
                      mv_getReg64int (DEST_REG));
           break;
 
         case 2: /* cfneg32 */
           DSPregs[DEST_REG].lower.i = -DSPregs[SRC1_REG].lower.i;
           printfdbg ("cfneg32 mvfx%d = -mvfx%d = %d\n",
                      DEST_REG,
                      SRC1_REG,
                      SRC2_REG,
                      DSPregs[DEST_REG].lower.i);
           break;
 
         case 3: /* cfneg64 */
           mv_setReg64int (DEST_REG, -mv_getReg64int (SRC1_REG));
           printfdbg ("cfneg64 mvdx%d = -mvdx%d = %lld\n",
                      DEST_REG,
                      SRC1_REG,
                      SRC2_REG,
                      mv_getReg64int (DEST_REG));
           break;
 
         case 4: /* cfadd32 */
           DSPregs[DEST_REG].lower.i = DSPregs[SRC1_REG].lower.i
             + DSPregs[SRC2_REG].lower.i;
           printfdbg ("cfadd32 mvfx%d = mvfx%d + mvfx%d = %d\n",
                      DEST_REG,
                      SRC1_REG,
                      SRC2_REG,
                      DSPregs[DEST_REG].lower.i);
           break;
 
         case 5: /* cfadd64 */
           mv_setReg64int (DEST_REG,
                           mv_getReg64int (SRC1_REG)
                           + mv_getReg64int (SRC2_REG));
           printfdbg ("cfadd64 mvdx%d = mvdx%d + mvdx%d = %lld\n",
                      DEST_REG,
                      SRC1_REG,
                      SRC2_REG,
                      mv_getReg64int (DEST_REG));
           break;
 
         case 6: /* cfsub32 */
           DSPregs[DEST_REG].lower.i = DSPregs[SRC1_REG].lower.i
             - DSPregs[SRC2_REG].lower.i;
           printfdbg ("cfsub32 mvfx%d = mvfx%d - mvfx%d = %d\n",
                      DEST_REG,
                      SRC1_REG,
                      SRC2_REG,
                      DSPregs[DEST_REG].lower.i);
           break;
 
         case 7: /* cfsub64 */
           mv_setReg64int (DEST_REG,
                           mv_getReg64int (SRC1_REG)
                           - mv_getReg64int (SRC2_REG));
           printfdbg ("cfsub64 mvdx%d = mvdx%d - mvdx%d = %d\n",
                      DEST_REG,
                      SRC1_REG,
                      SRC2_REG,
                      mv_getReg64int (DEST_REG));
           break;
         }
       break;
 
     default:
       fprintf (stderr, "unknown opcode in DSPCDP5 0x%x\n", instr);
       cirrus_not_implemented ("unknown");
       break;
     }
 
  return ARMul_DONE;
}
 
unsigned
DSPCDP6 (ARMul_State * state,
         unsigned      type,
         ARMword       instr)
{
   int opcode2;
 
   opcode2 = BITS (5,7);
 
   switch (BITS (20,21))
     {
     case 0:
       /* cfmadd32 */
       cirrus_not_implemented ("cfmadd32");
       break;
 
     case 1:
       /* cfmsub32 */
       cirrus_not_implemented ("cfmsub32");
       break;
 
     case 2:
       /* cfmadda32 */
       cirrus_not_implemented ("cfmadda32");
       break;
 
     case 3:
       /* cfmsuba32 */
       cirrus_not_implemented ("cfmsuba32");
       break;
 
     default:
       fprintf (stderr, "unknown opcode in DSPCDP6 0x%x\n", instr);
     }
 
   return ARMul_DONE;
}
 
/* Conversion functions.
 
   32-bit integers are stored in the LOWER half of a 64-bit physical
   register.
 
   Single precision floats are stored in the UPPER half of a 64-bit
   physical register.  */
 
static double
mv_getRegDouble (int regnum)
{
  reg_conv.ints[lsw_float_index] = DSPregs[regnum].upper.i;
  reg_conv.ints[msw_float_index] = DSPregs[regnum].lower.i;
  return reg_conv.d;
}
 
static void
mv_setRegDouble (int regnum, double val)
{
  reg_conv.d = val;
  DSPregs[regnum].upper.i = reg_conv.ints[lsw_float_index];
  DSPregs[regnum].lower.i = reg_conv.ints[msw_float_index];
}
 
static long long
mv_getReg64int (int regnum)
{
  reg_conv.ints[lsw_int_index] = DSPregs[regnum].lower.i;
  reg_conv.ints[msw_int_index] = DSPregs[regnum].upper.i;
  return reg_conv.ll;
}
 
static void
mv_setReg64int (int regnum, long long val)
{
  reg_conv.ll = val;
  DSPregs[regnum].lower.i = reg_conv.ints[lsw_int_index];
  DSPregs[regnum].upper.i = reg_conv.ints[msw_int_index];
}
 
/* Compute LSW in a double and a long long.  */
 
void
mv_compute_host_endianness (ARMul_State * state)
{
  static union
  {
    long long ll;
    long ints[2];
    long i;
    double d;
    float floats[2];
    float f;
  } conv;
 
  /* Calculate where's the LSW in a 64bit int.  */
  conv.ll = 45;
 
  if (conv.ints[0] == 0)
    {
      msw_int_index = 0;
      lsw_int_index = 1;
    }
  else
    {
      assert (conv.ints[1] == 0);
      msw_int_index = 1;
      lsw_int_index = 0;
    }
 
  /* Calculate where's the LSW in a double.  */
  conv.d = 3.0;
 
  if (conv.ints[0] == 0)
    {
      msw_float_index = 0;
      lsw_float_index = 1;
    }
  else
    {
      assert (conv.ints[1] == 0);
      msw_float_index = 1;
      lsw_float_index = 0;
    }
 
  printfdbg ("lsw_int_index   %d\n", lsw_int_index);
  printfdbg ("lsw_float_index %d\n", lsw_float_index);
}
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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [sim/] [arm/] [maverick.c] - Blame information for rev 310

Line No.	Rev	Author	Line
1	24	jeremybenn	`/* maverick.c -- Cirrus/DSP co-processor interface.`
2			`Copyright (C) 2003, 2007, 2008 Free Software Foundation, Inc.`
3			`Contributed by Aldy Hernandez (aldyh@redhat.com).`
4
5			`This program is free software; you can redistribute it and/or modify`
6			`it under the terms of the GNU General Public License as published by`
7			`the Free Software Foundation; either version 3 of the License, or`
8			`(at your option) any later version.`
9
10			`This program is distributed in the hope that it will be useful,`
11			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
12			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
13			`GNU General Public License for more details.`
14
15			`You should have received a copy of the GNU General Public License`
16			`along with this program. If not, see <http://www.gnu.org/licenses/>. */`
17
18			`#include <assert.h>`
19			`#include "armdefs.h"`
20			`#include "ansidecl.h"`
21			`#include "armemu.h"`
22
23			`/#define CIRRUS_DEBUG 1 /*/`
24			`#if CIRRUS_DEBUG`
25			`# define printfdbg printf`
26			`#else`
27			`# define printfdbg printf_nothing`
28			`#endif`
29
30			`#define POS64(i) ( (~(i)) >> 63 )`
31			`#define NEG64(i) ( (i) >> 63 )`
32
33			`/* Define Co-Processor instruction handlers here. */`
34
35			`/* Here's ARMulator's DSP definition. A few things to note:`
36			`1) it has 16 64-bit registers and 4 72-bit accumulators`
37			`2) you can only access its registers with MCR and MRC. */`
38
39			`/* We can't define these in here because this file might not be linked`
40			`unless the target is arm9e-*. They are defined in wrapper.c.`