[POWERPC] Import spu disassembly code into xmon

This patch imports and munges the spu disassembly code from binutils.

All files originated from version 1.1 in binutils cvs.
 * spu.h, spu-insns.h and spu-opc.c are unchanged except for pathnames.
 * spu-dis.c has been edited heavily:
   * use printf instead of info->fprintf_func and similar.
   * pass the instruction in rather than reading it.
   * we have no equivalent to symbol_at_address_func, so we just assume
     there is never a symbol at the address given.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

arch/powerpc/xmon/spu-dis.c

@@ -0,0 +1,249 @@
+/* Disassemble SPU instructions
+
+   Copyright 2006 Free Software Foundation, Inc.
+
+   This file is part of GDB, GAS, and the GNU binutils.
+
+   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.,
+   51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#include <linux/string.h>
+#include "nonstdio.h"
+#include "ansidecl.h"
+#include "spu.h"
+
+extern void print_address (unsigned long memaddr);
+
+/* This file provides a disassembler function which uses
+   the disassembler interface defined in dis-asm.h.   */
+
+extern const struct spu_opcode spu_opcodes[];
+extern const int spu_num_opcodes;
+
+#define SPU_DISASM_TBL_SIZE (1 << 11)
+static const struct spu_opcode *spu_disassemble_table[SPU_DISASM_TBL_SIZE];
+
+static void
+init_spu_disassemble (void)
+{
+  int i;
+
+  /* If two instructions have the same opcode then we prefer the first
+   * one.  In most cases it is just an alternate mnemonic. */
+  for (i = 0; i < spu_num_opcodes; i++)
+    {
+      int o = spu_opcodes[i].opcode;
+      if (o >= SPU_DISASM_TBL_SIZE)
+	continue; /* abort (); */
+      if (spu_disassemble_table[o] == 0)
+	spu_disassemble_table[o] = &spu_opcodes[i];
+    }
+}
+
+/* Determine the instruction from the 10 least significant bits. */
+static const struct spu_opcode *
+get_index_for_opcode (unsigned int insn)
+{
+  const struct spu_opcode *index;
+  unsigned int opcode = insn >> (32-11);
+
+  /* Init the table.  This assumes that element 0/opcode 0 (currently
+   * NOP) is always used */
+  if (spu_disassemble_table[0] == 0)
+    init_spu_disassemble ();
+
+  if ((index = spu_disassemble_table[opcode & 0x780]) != 0
+      && index->insn_type == RRR)
+    return index;
+
+  if ((index = spu_disassemble_table[opcode & 0x7f0]) != 0
+      && (index->insn_type == RI18 || index->insn_type == LBT))
+    return index;
+
+  if ((index = spu_disassemble_table[opcode & 0x7f8]) != 0
+      && index->insn_type == RI10)
+    return index;
+
+  if ((index = spu_disassemble_table[opcode & 0x7fc]) != 0
+      && (index->insn_type == RI16))
+    return index;
+
+  if ((index = spu_disassemble_table[opcode & 0x7fe]) != 0
+      && (index->insn_type == RI8))
+    return index;
+
+  if ((index = spu_disassemble_table[opcode & 0x7ff]) != 0)
+    return index;
+
+  return 0;
+}
+
+/* Print a Spu instruction.  */
+
+int
+print_insn_spu (unsigned long insn, unsigned long memaddr)
+{
+  int value;
+  int hex_value;
+  const struct spu_opcode *index;
+  enum spu_insns tag;
+
+  index = get_index_for_opcode (insn);
+
+  if (index == 0)
+    {
+      printf(".long 0x%x", insn);
+    }
+  else
+    {
+      int i;
+      int paren = 0;
+      tag = (enum spu_insns)(index - spu_opcodes);
+      printf("%s", index->mnemonic);
+      if (tag == M_BI || tag == M_BISL || tag == M_IRET || tag == M_BISLED
+	  || tag == M_BIHNZ || tag == M_BIHZ || tag == M_BINZ || tag == M_BIZ
+          || tag == M_SYNC || tag == M_HBR)
+	{
+	  int fb = (insn >> (32-18)) & 0x7f;
+	  if (fb & 0x40)
+	    printf(tag == M_SYNC ? "c" : "p");
+	  if (fb & 0x20)
+	    printf("d");
+	  if (fb & 0x10)
+	    printf("e");
+	}
+      if (index->arg[0] != 0)
+	printf("\t");
+      hex_value = 0;
+      for (i = 1;  i <= index->arg[0]; i++)
+	{
+	  int arg = index->arg[i];
+	  if (arg != A_P && !paren && i > 1)
+	    printf(",");
+
+	  switch (arg)
+	    {
+	    case A_T:
+	      printf("$%d",
+				     DECODE_INSN_RT (insn));
+	      break;
+	    case A_A:
+	      printf("$%d",
+				     DECODE_INSN_RA (insn));
+	      break;
+	    case A_B:
+	      printf("$%d",
+				     DECODE_INSN_RB (insn));
+	      break;
+	    case A_C:
+	      printf("$%d",
+				     DECODE_INSN_RC (insn));
+	      break;
+	    case A_S:
+	      printf("$sp%d",
+				     DECODE_INSN_RA (insn));
+	      break;
+	    case A_H:
+	      printf("$ch%d",
+				     DECODE_INSN_RA (insn));
+	      break;
+	    case A_P:
+	      paren++;
+	      printf("(");
+	      break;
+	    case A_U7A:
+	      printf("%d",
+				     173 - DECODE_INSN_U8 (insn));
+	      break;
+	    case A_U7B:
+	      printf("%d",
+				     155 - DECODE_INSN_U8 (insn));
+	      break;
+	    case A_S3:
+	    case A_S6:
+	    case A_S7:
+	    case A_S7N:
+	    case A_U3:
+	    case A_U5:
+	    case A_U6:
+	    case A_U7:
+	      hex_value = DECODE_INSN_I7 (insn);
+	      printf("%d", hex_value);
+	      break;
+	    case A_S11:
+	      print_address(memaddr + DECODE_INSN_I9a (insn) * 4);
+	      break;
+	    case A_S11I:
+	      print_address(memaddr + DECODE_INSN_I9b (insn) * 4);
+	      break;
+	    case A_S10:
+	    case A_S10B:
+	      hex_value = DECODE_INSN_I10 (insn);
+	      printf("%d", hex_value);
+	      break;
+	    case A_S14:
+	      hex_value = DECODE_INSN_I10 (insn) * 16;
+	      printf("%d", hex_value);
+	      break;
+	    case A_S16:
+	      hex_value = DECODE_INSN_I16 (insn);
+	      printf("%d", hex_value);
+	      break;
+	    case A_X16:
+	      hex_value = DECODE_INSN_U16 (insn);
+	      printf("%u", hex_value);
+	      break;
+	    case A_R18:
+	      value = DECODE_INSN_I16 (insn) * 4;
+	      if (value == 0)
+		printf("%d", value);
+	      else
+		{
+		  hex_value = memaddr + value;
+		  print_address(hex_value & 0x3ffff);
+		}
+	      break;
+	    case A_S18:
+	      value = DECODE_INSN_U16 (insn) * 4;
+	      if (value == 0)
+		printf("%d", value);
+	      else
+		print_address(value);
+	      break;
+	    case A_U18:
+	      value = DECODE_INSN_U18 (insn);
+	      if (value == 0 || 1)
+		{
+		  hex_value = value;
+		  printf("%u", value);
+		}
+	      else
+		print_address(value);
+	      break;
+	    case A_U14:
+	      hex_value = DECODE_INSN_U14 (insn);
+	      printf("%u", hex_value);
+	      break;
+	    }
+	  if (arg != A_P && paren)
+	    {
+	      printf(")");
+	      paren--;
+	    }
+	}
+      if (hex_value > 16)
+	printf("\t# %x", hex_value);
+    }
+  return 4;
+}