* mmix-dis.c, mmix-opc.c: New files.

1 files changed, 523 insertions, 0 deletions

diff --git a/opcodes/mmix-dis.c b/opcodes/mmix-dis.c
new file mode 100644
index 0000000000..c81e679f4e
--- /dev/null
+++ b/opcodes/mmix-dis.c
@@ -0,0 +1,523 @@
+/* mmix-dis.c -- Disassemble MMIX instructions.
+   Copyright (C) 2000, 2001 Free Software Foundation, Inc.
+   Written by Hans-Peter Nilsson (hp@bitrange.com)
+
+This file is part of GDB and the GNU binutils.
+
+GDB and the GNU binutils are free software; you can redistribute
+them and/or modify them under the terms of the GNU General Public
+License as published by the Free Software Foundation; either version 2,
+or (at your option) any later version.
+
+GDB and the GNU binutils are distributed in the hope that they
+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 file; see the file COPYING.  If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include "opcode/mmix.h"
+#include "dis-asm.h"
+#include "libiberty.h"
+#include "bfd.h"
+#include "opintl.h"
+
+#define BAD_CASE(x)				\
+ do						\
+   {						\
+     fprintf (stderr,				\
+	      _("Bad case %d (%s) in %s:%d\n"),	\
+	      x, #x, __FILE__, __LINE__);	\
+     abort ();					\
+   }						\
+ while (0)
+
+#define FATAL_DEBUG								\
+ do										\
+   {										\
+     fprintf (stderr,								\
+	      _("Internal: Non-debugged code (test-case missing): %s:%d"),	\
+	      __FILE__, __LINE__);						\
+     abort ();									\
+   }						\
+ while (0)
+
+#define ROUND_MODE(n)					\
+ ((n) == 1 ? "ROUND_OFF" : (n) == 2 ? "ROUND_UP" :	\
+  (n) == 3 ? "ROUND_DOWN" : (n) == 4 ? "ROUND_NEAR" :	\
+  _("(unknown)"))
+
+#define INSN_IMMEDIATE_BIT (IMM_OFFSET_BIT << 24)
+#define INSN_BACKWARD_OFFSET_BIT (1 << 24)
+
+struct mmix_dis_info
+ {
+   const char *reg_name[256];
+   const char *spec_reg_name[32];
+
+   /* Waste a little memory so we don't have to allocate each separately.
+      We could have an array with static contents for these, but on the
+      other hand, we don't have to.  */
+   char basic_reg_name[256][sizeof ("$255")];
+ };
+
+static boolean initialize_mmix_dis_info PARAMS ((struct disassemble_info *));
+static const struct mmix_opcode *get_opcode PARAMS ((unsigned long));
+
+
+/* Initialize a target-specific array in INFO.  */
+
+static boolean
+initialize_mmix_dis_info (info)
+     struct disassemble_info *info;
+{
+  struct mmix_dis_info *minfop = malloc (sizeof (struct mmix_dis_info));
+  int i;
+
+  if (minfop == NULL)
+    return false;
+
+  memset (minfop, 0, sizeof (*minfop));
+
+  /* Initialize register names from register symbols.  If there's no
+     register section, then there are no register symbols.  */
+  if ((info->section != NULL && info->section->owner != NULL)
+      || (info->symbols != NULL
+	  && info->symbols[0] != NULL
+	  && bfd_asymbol_bfd (info->symbols[0]) != NULL))
+    {
+      bfd *abfd = info->section && info->section->owner != NULL
+	? info->section->owner
+	: bfd_asymbol_bfd (info->symbols[0]);
+      asection *reg_section = bfd_get_section_by_name (abfd, "*REG*");
+
+      if (reg_section != NULL)
+	{
+	  /* The returned symcount *does* include the ending NULL.  */
+	  long symsize = bfd_get_symtab_upper_bound (abfd);
+	  asymbol **syms = malloc (symsize);
+	  long nsyms;
+	  long i;
+
+	  if (syms == NULL)
+	    { FATAL_DEBUG;
+	      free (minfop);
+	      return false;
+	    }
+	  nsyms = bfd_canonicalize_symtab (abfd, syms);
+
+	  /* We use the first name for a register.  If this is MMO, then
+	     it's the name with the first sequence number, presumably the
+	     first in the source.  */
+	  for (i = 0; i < nsyms && syms[i] != NULL; i++)
+	    {
+	      if (syms[i]->section == reg_section
+		  && syms[i]->value < 256
+		  && minfop->reg_name[syms[i]->value] == NULL)
+		minfop->reg_name[syms[i]->value] = syms[i]->name;
+	    }
+	}
+    }
+
+  /* Fill in the rest with the canonical names.  */
+  for (i = 0; i < 256; i++)
+    if (minfop->reg_name[i] == NULL)
+      {
+	sprintf (minfop->basic_reg_name[i], "$%d", i);
+	minfop->reg_name[i] = minfop->basic_reg_name[i];
+      }
+
+  /* We assume it's actually a one-to-one mapping of number-to-name.  */
+  for (i = 0; mmix_spec_regs[i].name != NULL; i++)
+    minfop->spec_reg_name[mmix_spec_regs[i].number] = mmix_spec_regs[i].name;
+
+  info->private_data = (PTR) minfop;
+  return true;
+}
+
+/* A table indexed by the first byte is constructed as we disassemble each
+   tetrabyte.  The contents is a pointer into mmix_insns reflecting the
+   first found entry with matching match-bits and lose-bits.  Further
+   entries are considered one after one until the operand constraints
+   match or the match-bits and lose-bits do not match.  Normally a
+   "further entry" will just show that there was no other match.  */
+
+static const struct mmix_opcode *
+get_opcode (insn)
+     unsigned long insn;
+{
+  static const struct mmix_opcode **opcodes = NULL;
+  const struct mmix_opcode *opcodep = mmix_opcodes;
+  unsigned int opcode_part = (insn >> 24) & 255;
+  if (opcodes == NULL)
+    opcodes = xcalloc (256, sizeof (struct mmix_opcode *));
+
+  opcodep = opcodes[opcode_part];
+  if (opcodep == NULL
+      || (opcodep->match & insn) != opcodep->match
+      || (opcodep->lose & insn) != 0)
+    {
+      /* Search through the table.  */
+      for (opcodep = mmix_opcodes; opcodep->name != NULL; opcodep++)
+	{
+	  /* FIXME: Break out this into an initialization function.  */
+	  if ((opcodep->match & (opcode_part << 24)) == opcode_part
+	      && (opcodep->lose & (opcode_part << 24)) == 0)
+	    opcodes[opcode_part] = opcodep;
+
+	  if ((opcodep->match & insn) == opcodep->match
+	      && (opcodep->lose & insn) == 0)
+	    break;
+	}
+    }
+
+  if (opcodep->name == NULL)
+    return NULL;
+
+  /* Check constraints.  If they don't match, loop through the next opcode
+     entries.  */
+  do
+    {
+      switch (opcodep->operands)
+	{
+	  /* These have no restraint on what can be in the lower three
+	     bytes.  */
+	case mmix_operands_regs:
+	case mmix_operands_reg_yz:
+	case mmix_operands_regs_z_opt:
+	case mmix_operands_regs_z:
+	case mmix_operands_jmp:
+	case mmix_operands_pushgo:
+	case mmix_operands_pop:
+	case mmix_operands_sync:
+	case mmix_operands_x_regs_z:
+	case mmix_operands_neg:
+	case mmix_operands_pushj:
+	case mmix_operands_regaddr:
+	case mmix_operands_get:
+	case mmix_operands_set:
+	case mmix_operands_save:
+	case mmix_operands_unsave:
+	case mmix_operands_xyz_opt:
+	  return opcodep;
+
+	  /* For a ROUND_MODE, the middle byte must be 0..4.  */
+	case mmix_operands_roundregs_z:
+	case mmix_operands_roundregs:
+	  {
+	    int midbyte = (insn >> 8) & 255;
+	    if (midbyte <= 4)
+	      return opcodep;
+	  }
+	break;
+
+	case mmix_operands_put:
+	  /* A "PUT".  If it is "immediate", then no restrictions,
+	     otherwise we have to make sure the register number is < 32.  */
+	  if ((insn & INSN_IMMEDIATE_BIT)
+	      || ((insn >> 16) & 255) < 32)
+	    return opcodep;
+	  break;
+
+	case mmix_operands_resume:
+	  /* Middle bytes must be zero.  */
+	  if ((insn & 0x00ffff00) == 0)
+	    return opcodep;
+	  break;
+
+	default:
+	  BAD_CASE (opcodep->operands);
+	}
+
+      opcodep++;
+    }
+  while ((opcodep->match & insn) == opcodep->match
+	 && (opcodep->lose & insn) == 0);
+
+  /* If we got here, we had no match.  */
+  return NULL;
+}
+
+/* The main disassembly function.  */
+
+int
+print_insn_mmix (memaddr, info)
+     bfd_vma memaddr;
+     struct disassemble_info *info;
+{
+  unsigned char buffer[4];
+  unsigned long insn;
+  unsigned int x, y, z;
+  const struct mmix_opcode *opcodep;
+  int status = (*info->read_memory_func) (memaddr, buffer, 4, info);
+  struct mmix_dis_info *minfop;
+
+  if (status != 0)
+    {
+      (*info->memory_error_func) (status, memaddr, info);
+      return -1;
+    }
+
+  /* FIXME: Is -1 suitable?  */
+  if (info->private_data == NULL
+      && ! initialize_mmix_dis_info (info))
+    return -1;
+
+  minfop = (struct mmix_dis_info *) info->private_data;
+  x = buffer[1];
+  y = buffer[2];
+  z = buffer[3];
+
+  insn = bfd_getb32 (buffer);
+
+  opcodep = get_opcode (insn);
+
+  if (opcodep == NULL)
+    {
+      (*info->fprintf_func) (info->stream, _("*unknown*"));
+      return 4;
+    }
+
+  (*info->fprintf_func) (info->stream, "%s ", opcodep->name);
+
+  /* Present bytes in the order they are laid out in memory.  */
+  info->display_endian = BFD_ENDIAN_BIG;
+
+  info->insn_info_valid = 1;
+  info->bytes_per_chunk = 4;
+  info->branch_delay_insns = 0;
+  info->target = 0;
+  switch (opcodep->type)
+    {
+    case mmix_type_normal:
+    case mmix_type_memaccess_block:
+      info->insn_type = dis_nonbranch;
+      break;
+
+    case mmix_type_branch:
+      info->insn_type = dis_branch;
+      break;
+
+    case mmix_type_condbranch:
+      info->insn_type = dis_condbranch;
+      break;
+
+    case mmix_type_memaccess_octa:
+      info->insn_type = dis_dref;
+      info->data_size = 8;
+      break;
+
+    case mmix_type_memaccess_tetra:
+      info->insn_type = dis_dref;
+      info->data_size = 4;
+      break;
+
+    case mmix_type_memaccess_wyde:
+      info->insn_type = dis_dref;
+      info->data_size = 2;
+      break;
+
+    case mmix_type_memaccess_byte:
+      info->insn_type = dis_dref;
+      info->data_size = 1;
+      break;
+
+    case mmix_type_jsr:
+      info->insn_type = dis_jsr;
+      break;
+
+    default:
+      BAD_CASE(opcodep->type);
+    }
+
+  switch (opcodep->operands)
+    {
+    case mmix_operands_regs:
+      /*  All registers: "$X,$Y,$Z".  */
+      (*info->fprintf_func) (info->stream, "%s,%s,%s",
+			     minfop->reg_name[x],
+			     minfop->reg_name[y],
+			     minfop->reg_name[z]);
+      break;
+
+    case mmix_operands_reg_yz:
+      /* Like SETH - "$X,YZ".  */
+      (*info->fprintf_func) (info->stream, "%s,0x%x",
+			     minfop->reg_name[x], y * 256 + z);
+      break;
+
+    case mmix_operands_regs_z_opt:
+    case mmix_operands_regs_z:
+    case mmix_operands_pushgo:
+      /* The regular "$X,$Y,$Z|Z".  */
+      if (insn & INSN_IMMEDIATE_BIT)
+	(*info->fprintf_func) (info->stream, "%s,%s,%d",
+			       minfop->reg_name[x], minfop->reg_name[y], z);
+      else
+	(*info->fprintf_func) (info->stream, "%s,%s,%s",
+			       minfop->reg_name[x],
+			       minfop->reg_name[y],
+			       minfop->reg_name[z]);
+      break;
+
+    case mmix_operands_jmp:
+      /* Address; only JMP.  */
+      {
+	bfd_signed_vma offset = (x * 65536 + y * 256 + z) * 4;
+
+	if (insn & INSN_BACKWARD_OFFSET_BIT)
+	  offset -= (256 * 65536) * 4;
+
+	info->target = memaddr + offset;
+	(*info->print_address_func) (memaddr + offset, info);
+      }
+      break;
+
+    case mmix_operands_roundregs_z:
+      /* Two registers, like FLOT, possibly with rounding: "$X,$Z|Z"
+	 "$X,ROUND_MODE,$Z|Z".  */
+      if (y != 0)
+	{
+	  if (insn & INSN_IMMEDIATE_BIT)
+	    (*info->fprintf_func) (info->stream, "%s,%s,%d",
+				   minfop->reg_name[x],
+				   ROUND_MODE (y), z);
+	  else
+	    (*info->fprintf_func) (info->stream, "%s,%s,%s",
+				   minfop->reg_name[x],
+				   ROUND_MODE (y),
+				   minfop->reg_name[z]);
+	}
+      else
+	{
+	  if (insn & INSN_IMMEDIATE_BIT)
+	    (*info->fprintf_func) (info->stream, "%s,%d",
+				   minfop->reg_name[x], z);
+	  else
+	    (*info->fprintf_func) (info->stream, "%s,%s",
+				   minfop->reg_name[x],
+				   minfop->reg_name[z]);
+	}
+      break;
+
+    case mmix_operands_pop:
+      /* Like POP - "X,YZ".  */
+      (*info->fprintf_func) (info->stream, "%d,%d", x, y*256 + z);
+      break;
+
+    case mmix_operands_roundregs:
+      /* Two registers, possibly with rounding: "$X,$Z" or
+	 "$X,ROUND_MODE,$Z".  */
+      if (y != 0)
+	(*info->fprintf_func) (info->stream, "%s,%s,%s",
+			       minfop->reg_name[x],
+			       ROUND_MODE (y),
+			       minfop->reg_name[z]);
+      else
+	(*info->fprintf_func) (info->stream, "%s,%s",
+			       minfop->reg_name[x],
+			       minfop->reg_name[z]);
+      break;
+
+    case mmix_operands_sync:
+	/* Like SYNC - "XYZ".  */
+      (*info->fprintf_func) (info->stream, "%u",
+			     x * 65536 + y * 256 + z);
+      break;
+
+    case mmix_operands_x_regs_z:
+      /* Like SYNCD - "X,$Y,$Z|Z".  */
+      if (insn & INSN_IMMEDIATE_BIT)
+	(*info->fprintf_func) (info->stream, "%d,%s,%d",
+			       x, minfop->reg_name[y], z);
+      else
+	(*info->fprintf_func) (info->stream, "%d,%s,%s",
+			       x, minfop->reg_name[y],
+			       minfop->reg_name[z]);
+      break;
+
+    case mmix_operands_neg:
+      /* Like NEG and NEGU - "$X,Y,$Z|Z".  */
+      if (insn & INSN_IMMEDIATE_BIT)
+	(*info->fprintf_func) (info->stream, "%s,%d,%d",
+			       minfop->reg_name[x], y, z);
+      else
+	(*info->fprintf_func) (info->stream, "%s,%d,%s",
+			       minfop->reg_name[x], y,
+			       minfop->reg_name[z]);
+      break;
+
+    case mmix_operands_pushj:
+    case mmix_operands_regaddr:
+      /* Like GETA or branches - "$X,Address".  */
+      {
+	bfd_signed_vma offset = (y * 256 + z) * 4;
+
+	if (insn & INSN_BACKWARD_OFFSET_BIT)
+	  offset -= 65536 * 4;
+
+	info->target = memaddr + offset;
+
+	(*info->fprintf_func) (info->stream, "%s,", minfop->reg_name[x]);
+	(*info->print_address_func) (memaddr + offset, info);
+      }
+      break;
+
+    case mmix_operands_get:
+      /* GET - "X,spec_reg".  */
+      (*info->fprintf_func) (info->stream, "%s,%s",
+			     minfop->reg_name[x],
+			     minfop->spec_reg_name[z]);
+      break;
+
+    case mmix_operands_put:
+      /* PUT - "spec_reg,$Z|Z".  */
+      if (insn & INSN_IMMEDIATE_BIT)
+	(*info->fprintf_func) (info->stream, "%s,%d",
+			       minfop->spec_reg_name[x], z);
+      else
+	(*info->fprintf_func) (info->stream, "%s,%s",
+			       minfop->spec_reg_name[x],
+			       minfop->reg_name[z]);
+      break;
+
+    case mmix_operands_set:
+      /*  Two registers, "$X,$Y".  */
+      (*info->fprintf_func) (info->stream, "%s,%s",
+			     minfop->reg_name[x],
+			     minfop->reg_name[y]);
+      break;
+
+    case mmix_operands_save:
+      /* SAVE - "$X,0".  */
+      (*info->fprintf_func) (info->stream, "%s,0", minfop->reg_name[x]);
+      break;
+
+    case mmix_operands_unsave:
+      /* UNSAVE - "0,$Z".  */
+      (*info->fprintf_func) (info->stream, "0,%s", minfop->reg_name[z]);
+      break;
+
+    case mmix_operands_xyz_opt:
+      /* Like SWYM or TRAP - "X,Y,Z".  */
+      (*info->fprintf_func) (info->stream, "%d,%d,%d", x, y, z);
+      break;
+
+    case mmix_operands_resume:
+      /* Just "Z", like RESUME.  */
+      (*info->fprintf_func) (info->stream, "%d", z);
+      break;
+
+    default:
+      (*info->fprintf_func) (info->stream, _("*unknown operands type: %d*"),
+			     opcodep->operands);
+      break;
+    }
+
+  return 4;
+}