sim/common/cgen-utils.c

/* Support code for various pieces of CGEN simulators.
   Copyright (C) 1996-2024 Free Software Foundation, Inc.
   Contributed by Cygnus Support.

This file is part of GDB, the GNU debugger.

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/>.  */

/* This must come before any other includes.  */
#include "defs.h"

#include "bfd.h"
#include "dis-asm.h"

#include "sim-main.h"
#include "sim-signal.h"

#define MEMOPS_DEFINE_INLINE
#include "cgen-mem.h"

#define SEMOPS_DEFINE_INLINE
#include "cgen-ops.h"

const char * const cgen_mode_names[] = {
  "VOID",
  "BI",
  "QI",
  "HI",
  "SI",
  "DI",
  "UQI",
  "UHI",
  "USI",
  "UDI",
  "SF",
  "DF",
  "XF",
  "TF",
  0, /* MODE_TARGET_MAX */
  "INT",
  "UINT",
  "PTR"
};

/* Opcode table for virtual insns used by the simulator.  */

#define V CGEN_ATTR_MASK (CGEN_INSN_VIRTUAL)

static const CGEN_IBASE virtual_insn_entries[] =
{
  {
    VIRTUAL_INSN_X_INVALID, "--invalid--", NULL, 0, { V, {} }
  },
  {
    VIRTUAL_INSN_X_BEFORE, "--before--", NULL, 0, { V, {} }
  },
  {
    VIRTUAL_INSN_X_AFTER, "--after--", NULL, 0, { V, {} }
  },
  {
    VIRTUAL_INSN_X_BEGIN, "--begin--", NULL, 0, { V, {} }
  },
  {
    VIRTUAL_INSN_X_CHAIN, "--chain--", NULL, 0, { V, {} }
  },
  {
    VIRTUAL_INSN_X_CTI_CHAIN, "--cti-chain--", NULL, 0, { V, {} }
  }
};

#undef V

const CGEN_INSN cgen_virtual_insn_table[] =
{
  { & virtual_insn_entries[0] },
  { & virtual_insn_entries[1] },
  { & virtual_insn_entries[2] },
  { & virtual_insn_entries[3] },
  { & virtual_insn_entries[4] },
  { & virtual_insn_entries[5] }
};

/* Return the name of insn number I.  */

const char *
cgen_insn_name (SIM_CPU *cpu, int i)
{
  return CGEN_INSN_NAME ((* CPU_GET_IDATA (cpu)) ((cpu), (i)));
}

/* Return the maximum number of extra bytes required for a SIM_CPU struct.  */

int
cgen_cpu_max_extra_bytes (SIM_DESC sd)
{
  const SIM_MACH * const *machp;
  int extra = 0;

  SIM_ASSERT (STATE_MACHS (sd) != NULL);

  for (machp = STATE_MACHS (sd); *machp != NULL; ++machp)
    {
      int size = IMP_PROPS_SIM_CPU_SIZE (MACH_IMP_PROPS (*machp));
      if (size > extra)
	extra = size;
    }
  return extra;
}

#ifdef DI_FN_SUPPORT

DI
ANDDI (a, b)
     DI a, b;
{
  SI ahi = GETHIDI (a);
  SI alo = GETLODI (a);
  SI bhi = GETHIDI (b);
  SI blo = GETLODI (b);
  return MAKEDI (ahi & bhi, alo & blo);
}

DI
ORDI (a, b)
     DI a, b;
{
  SI ahi = GETHIDI (a);
  SI alo = GETLODI (a);
  SI bhi = GETHIDI (b);
  SI blo = GETLODI (b);
  return MAKEDI (ahi | bhi, alo | blo);
}

DI
ADDDI (a, b)
     DI a, b;
{
  USI ahi = GETHIDI (a);
  USI alo = GETLODI (a);
  USI bhi = GETHIDI (b);
  USI blo = GETLODI (b);
  USI x = alo + blo;
  return MAKEDI (ahi + bhi + (x < alo), x);
}

DI
MULDI (a, b)
     DI a, b;
{
  USI ahi = GETHIDI (a);
  USI alo = GETLODI (a);
  USI bhi = GETHIDI (b);
  USI blo = GETLODI (b);
  USI rhi,rlo;
  USI x0, x1, x2, x3;

  x0 = alo * blo;
  x1 = alo * bhi;
  x2 = ahi * blo;
  x3 = ahi * bhi;

#define SI_TYPE_SIZE 32
#define BITS4 (SI_TYPE_SIZE / 4)
#define ll_B (1L << (SI_TYPE_SIZE / 2))
#define ll_lowpart(t) ((USI) (t) % ll_B)
#define ll_highpart(t) ((USI) (t) / ll_B)
  x1 += ll_highpart (x0);	/* this can't give carry */
  x1 += x2;			/* but this indeed can */
  if (x1 < x2)			/* did we get it? */
    x3 += ll_B;			/* yes, add it in the proper pos. */

  rhi = x3 + ll_highpart (x1);
  rlo = ll_lowpart (x1) * ll_B + ll_lowpart (x0);
  return MAKEDI (rhi + (alo * bhi) + (ahi * blo), rlo);
}

DI
SHLDI (val, shift)
     DI val;
     SI shift;
{
  USI hi = GETHIDI (val);
  USI lo = GETLODI (val);
  /* FIXME: Need to worry about shift < 0 || shift >= 32.  */
  return MAKEDI ((hi << shift) | (lo >> (32 - shift)), lo << shift);
}

DI
SLADI (val, shift)
     DI val;
     SI shift;
{
  SI hi = GETHIDI (val);
  USI lo = GETLODI (val);
  /* FIXME: Need to worry about shift < 0 || shift >= 32.  */
  return MAKEDI ((hi << shift) | (lo >> (32 - shift)), lo << shift);
}

DI
SRADI (val, shift)
     DI val;
     SI shift;
{
  SI hi = GETHIDI (val);
  USI lo = GETLODI (val);
  /* We use SRASI because the result is implementation defined if hi < 0.  */
  /* FIXME: Need to worry about shift < 0 || shift >= 32.  */
  return MAKEDI (SRASI (hi, shift), (hi << (32 - shift)) | (lo >> shift));
}

int
GEDI (a, b)
     DI a, b;
{
  SI ahi = GETHIDI (a);
  USI alo = GETLODI (a);
  SI bhi = GETHIDI (b);
  USI blo = GETLODI (b);
  if (ahi > bhi)
    return 1;
  if (ahi == bhi)
    return alo >= blo;
  return 0;
}

int
LEDI (a, b)
     DI a, b;
{
  SI ahi = GETHIDI (a);
  USI alo = GETLODI (a);
  SI bhi = GETHIDI (b);
  USI blo = GETLODI (b);
  if (ahi < bhi)
    return 1;
  if (ahi == bhi)
    return alo <= blo;
  return 0;
}

DI
CONVHIDI (val)
     HI val;
{
  if (val < 0)
    return MAKEDI (-1, val);
  else
    return MAKEDI (0, val);
}

DI
CONVSIDI (val)
     SI val;
{
  if (val < 0)
    return MAKEDI (-1, val);
  else
    return MAKEDI (0, val);
}

SI
CONVDISI (val)
     DI val;
{
  return GETLODI (val);
}

#endif /* DI_FN_SUPPORT */

QI
RORQI (QI val, int shift)
{
  if (shift != 0)
    {
      int remain = 8 - shift;
      int mask = (1 << shift) - 1;
      QI result = (val & mask) << remain;
      mask = (1 << remain) - 1;
      result |= (val >> shift) & mask;
      return result;
    }
  return val;
}

QI
ROLQI (QI val, int shift)
{
  if (shift != 0)
    {
      int remain = 8 - shift;
      int mask = (1 << remain) - 1;
      QI result = (val & mask) << shift;
      mask = (1 << shift) - 1;
      result |= (val >> remain) & mask;
      return result;
    }
  return val;
}

HI
RORHI (HI val, int shift)
{
  if (shift != 0)
    {
      int remain = 16 - shift;
      int mask = (1 << shift) - 1;
      HI result = (val & mask) << remain;
      mask = (1 << remain) - 1;
      result |= (val >> shift) & mask;
      return result;
    }
  return val;
}

HI
ROLHI (HI val, int shift)
{
  if (shift != 0)
    {
      int remain = 16 - shift;
      int mask = (1 << remain) - 1;
      HI result = (val & mask) << shift;
      mask = (1 << shift) - 1;
      result |= (val >> remain) & mask;
      return result;
    }
  return val;
}

SI
RORSI (SI val, int shift)
{
  if (shift != 0)
    {
      int remain = 32 - shift;
      int mask = (1 << shift) - 1;
      SI result = (val & mask) << remain;
      mask = (1 << remain) - 1;
      result |= (val >> shift) & mask;
      return result;
    }
  return val;
}

SI
ROLSI (SI val, int shift)
{
  if (shift != 0)
    {
      int remain = 32 - shift;
      int mask = (1 << remain) - 1;
      SI result = (val & mask) << shift;
      mask = (1 << shift) - 1;
      result |= (val >> remain) & mask;
      return result;
    }

  return val;
}

/* Emit an error message from CGEN RTL.  */

void
cgen_rtx_error (SIM_CPU *cpu, const char * msg)
{
  SIM_DESC sd = CPU_STATE (cpu);

  sim_io_printf (sd, "%s", msg);
  sim_io_printf (sd, "\n");

  sim_engine_halt (sd, cpu, NULL, CPU_PC_GET (cpu), sim_stopped, SIM_SIGTRAP);
}