include/opcode/v850.h

   1 /* v850.h -- Header file for NEC V850 opcode table
   2    Copyright 1996 Free Software Foundation, Inc.
   3    Written by J.T. Conklin, 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 1, 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 #ifndef V850_H
  22 #define V850_H
  23
  24 /* The opcode table is an array of struct v850_opcode.  */
  25
  26 struct v850_opcode
  27 {
  28   /* The opcode name.  */
  29   const char *name;
  30
  31   /* The opcode itself.  Those bits which will be filled in with
  32      operands are zeroes.  */
  33   unsigned long opcode;
  34
  35   /* The opcode mask.  This is used by the disassembler.  This is a
  36      mask containing ones indicating those bits which must match the
  37      opcode field, and zeroes indicating those bits which need not
  38      match (and are presumably filled in by operands).  */
  39   unsigned long mask;
  40
  41   /* An array of operand codes.  Each code is an index into the
  42      operand table.  They appear in the order which the operands must
  43      appear in assembly code, and are terminated by a zero.  */
  44   unsigned char operands[8];
  45 };
  46
  47 /* The table itself is sorted by major opcode number, and is otherwise
  48    in the order in which the disassembler should consider
  49    instructions.  */
  50 extern const struct v850_opcode v850_opcodes[];
  51 extern const int v850_num_opcodes;
  52
  53 \f
  54 /* The operands table is an array of struct powerpc_operand.  */
  55
  56 struct v850_operand
  57 {
  58   /* The number of bits in the operand.  */
  59   int bits;
  60
  61   /* How far the operand is left shifted in the instruction.  */
  62   int shift;
  63
  64   /* Insertion function.  This is used by the assembler.  To insert an
  65      operand value into an instruction, check this field.
  66
  67      If it is NULL, execute
  68          i |= (op & ((1 << o->bits) - 1)) << o->shift;
  69      (i is the instruction which we are filling in, o is a pointer to
  70      this structure, and op is the opcode value; this assumes twos
  71      complement arithmetic).
  72
  73      If this field is not NULL, then simply call it with the
  74      instruction and the operand value.  It will return the new value
  75      of the instruction.  If the ERRMSG argument is not NULL, then if
  76      the operand value is illegal, *ERRMSG will be set to a warning
  77      string (the operand will be inserted in any case).  If the
  78      operand value is legal, *ERRMSG will be unchanged (most operands
  79      can accept any value).  */
  80   unsigned long (*insert) PARAMS ((unsigned long instruction, long op,
  81                                    const char **errmsg));
  82
  83   /* Extraction function.  This is used by the disassembler.  To
  84      extract this operand type from an instruction, check this field.
  85
  86      If it is NULL, compute
  87          op = ((i) >> o->shift) & ((1 << o->bits) - 1);
  88          if ((o->flags & PPC_OPERAND_SIGNED) != 0
  89              && (op & (1 << (o->bits - 1))) != 0)
  90            op -= 1 << o->bits;
  91      (i is the instruction, o is a pointer to this structure, and op
  92      is the result; this assumes twos complement arithmetic).
  93
  94      If this field is not NULL, then simply call it with the
  95      instruction value.  It will return the value of the operand.  If
  96      the INVALID argument is not NULL, *INVALID will be set to
  97      non-zero if this operand type can not actually be extracted from
  98      this operand (i.e., the instruction does not match).  If the
  99      operand is valid, *INVALID will not be changed.  */
 100   long (*extract) PARAMS ((unsigned long instruction, int *invalid));
 101
 102   /* One bit syntax flags.  */
 103   int flags;
 104 };
 105
 106 /* Elements in the table are retrieved by indexing with values from
 107    the operands field of the v850_opcodes table.  */
 108
 109 extern const struct v850_operand v850_operands[];
 110
 111 /* Values defined for the flags field of a struct v850_operand.  */
 112
 113 /* This operand names a general purpose register */
 114 #define V850_OPERAND_REG        0x01
 115
 116 /* This operand names a system register */
 117 #define V850_OPERAND_SRG        0x02
 118
 119 /* This operand names a condition code used in the setf instruction */
 120 #define V850_OPERAND_CC         0x04
 121
 122 /* This operand takes signed values */
 123 #define V850_OPERAND_SIGNED     0x08
 124
 125 #endif /* V850_H */