arch/ppc64/xmon/ppc-dis.c

   1 /* ppc-dis.c -- Disassemble PowerPC instructions
   2    Copyright 1994 Free Software Foundation, Inc.
   3    Written by Ian Lance Taylor, Cygnus Support
   4
   5 This file is part of GDB, GAS, and the GNU binutils.
   6
   7 GDB, GAS, and the GNU binutils are free software; you can redistribute
   8 them and/or modify them under the terms of the GNU General Public
   9 License as published by the Free Software Foundation; either version
  10 2, or (at your option) any later version.
  11
  12 GDB, GAS, and the GNU binutils are distributed in the hope that they
  13 will be useful, but WITHOUT ANY WARRANTY; without even the implied
  14 warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15 the GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this file; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #include "nonstdio.h"
  22 #include "ansidecl.h"
  23 #include "ppc.h"
  24
  25 extern void print_address (unsigned long memaddr);
  26
  27 /* Print a PowerPC or POWER instruction.  */
  28
  29 int
  30 print_insn_powerpc (unsigned long insn, unsigned long memaddr, int dialect)
  31 {
  32   const struct powerpc_opcode *opcode;
  33   const struct powerpc_opcode *opcode_end;
  34   unsigned long op;
  35
  36   if (dialect == 0)
  37     dialect = PPC_OPCODE_PPC | PPC_OPCODE_CLASSIC | PPC_OPCODE_COMMON
  38               | PPC_OPCODE_64 | PPC_OPCODE_POWER4 | PPC_OPCODE_ALTIVEC;
  39
  40   /* Get the major opcode of the instruction.  */
  41   op = PPC_OP (insn);
  42
  43   /* Find the first match in the opcode table.  We could speed this up
  44      a bit by doing a binary search on the major opcode.  */
  45   opcode_end = powerpc_opcodes + powerpc_num_opcodes;
  46  again:
  47   for (opcode = powerpc_opcodes; opcode < opcode_end; opcode++)
  48     {
  49       unsigned long table_op;
  50       const unsigned char *opindex;
  51       const struct powerpc_operand *operand;
  52       int invalid;
  53       int need_comma;
  54       int need_paren;
  55
  56       table_op = PPC_OP (opcode->opcode);
  57       if (op < table_op)
  58         break;
  59       if (op > table_op)
  60         continue;
  61
  62       if ((insn & opcode->mask) != opcode->opcode
  63           || (opcode->flags & dialect) == 0)
  64         continue;
  65
  66       /* Make two passes over the operands.  First see if any of them
  67          have extraction functions, and, if they do, make sure the
  68          instruction is valid.  */
  69       invalid = 0;
  70       for (opindex = opcode->operands; *opindex != 0; opindex++)
  71         {
  72           operand = powerpc_operands + *opindex;
  73           if (operand->extract)
  74             (*operand->extract) (insn, dialect, &invalid);
  75         }
  76       if (invalid)
  77         continue;
  78
  79       /* The instruction is valid.  */
  80       printf("%s", opcode->name);
  81       if (opcode->operands[0] != 0)
  82         printf("\t");
  83
  84       /* Now extract and print the operands.  */
  85       need_comma = 0;
  86       need_paren = 0;
  87       for (opindex = opcode->operands; *opindex != 0; opindex++)
  88         {
  89           long value;
  90
  91           operand = powerpc_operands + *opindex;
  92
  93           /* Operands that are marked FAKE are simply ignored.  We
  94              already made sure that the extract function considered
  95              the instruction to be valid.  */
  96           if ((operand->flags & PPC_OPERAND_FAKE) != 0)
  97             continue;
  98
  99           /* Extract the value from the instruction.  */
 100           if (operand->extract)
 101             value = (*operand->extract) (insn, dialect, &invalid);
 102           else
 103             {
 104               value = (insn >> operand->shift) & ((1 << operand->bits) - 1);
 105               if ((operand->flags & PPC_OPERAND_SIGNED) != 0
 106                   && (value & (1 << (operand->bits - 1))) != 0)
 107                 value -= 1 << operand->bits;
 108             }
 109
 110           /* If the operand is optional, and the value is zero, don't
 111              print anything.  */
 112           if ((operand->flags & PPC_OPERAND_OPTIONAL) != 0
 113               && (operand->flags & PPC_OPERAND_NEXT) == 0
 114               && value == 0)
 115             continue;
 116
 117           if (need_comma)
 118             {
 119               printf(",");
 120               need_comma = 0;
 121             }
 122
 123           /* Print the operand as directed by the flags.  */
 124           if ((operand->flags & PPC_OPERAND_GPR) != 0)
 125             printf("r%ld", value);
 126           else if ((operand->flags & PPC_OPERAND_FPR) != 0)
 127             printf("f%ld", value);
 128           else if ((operand->flags & PPC_OPERAND_VR) != 0)
 129             printf("v%ld", value);
 130           else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0)
 131             print_address (memaddr + value);
 132           else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0)
 133             print_address (value & 0xffffffff);
 134           else if ((operand->flags & PPC_OPERAND_CR) == 0
 135                    || (dialect & PPC_OPCODE_PPC) == 0)
 136             printf("%ld", value);
 137           else
 138             {
 139               if (operand->bits == 3)
 140                 printf("cr%d", value);
 141               else
 142                 {
 143                   static const char *cbnames[4] = { "lt", "gt", "eq", "so" };
 144                   int cr;
 145                   int cc;
 146
 147                   cr = value >> 2;
 148                   if (cr != 0)
 149                     printf("4*cr%d+", cr);
 150                   cc = value & 3;
 151                   printf("%s", cbnames[cc]);
 152                 }
 153             }
 154
 155           if (need_paren)
 156             {
 157               printf(")");
 158               need_paren = 0;
 159             }
 160
 161           if ((operand->flags & PPC_OPERAND_PARENS) == 0)
 162             need_comma = 1;
 163           else
 164             {
 165               printf("(");
 166               need_paren = 1;
 167             }
 168         }
 169
 170       /* We have found and printed an instruction; return.  */
 171       return 4;
 172     }
 173
 174   if ((dialect & PPC_OPCODE_ANY) != 0)
 175     {
 176       dialect = ~PPC_OPCODE_ANY;
 177       goto again;
 178     }
 179
 180   /* We could not find a match.  */
 181   printf(".long 0x%lx", insn);
 182
 183   return 4;
 184 }