opcode-mmix.h

   1 /* mmix.h -- Header file for MMIX opcode table
   2    Copyright (C) 2001, 2003 Free Software Foundation, Inc.
   3    Written by Hans-Peter Nilsson (hp@bitrange.com)
   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 2,
  10 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, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  20
  21 /* We could have just a char*[] table indexed by the register number, but
  22    that would not allow for synonyms.  The table is terminated with an
  23    entry with a NULL name.  */
  24 struct mmix_spec_reg
  25 {
  26   const char *name;
  27   unsigned int number;
  28 };
  29
  30 /* General indication of the type of instruction.  */
  31 enum mmix_insn_type
  32  {
  33    mmix_type_pseudo,
  34    mmix_type_normal,
  35    mmix_type_branch,
  36    mmix_type_condbranch,
  37    mmix_type_memaccess_octa,
  38    mmix_type_memaccess_tetra,
  39    mmix_type_memaccess_wyde,
  40    mmix_type_memaccess_byte,
  41    mmix_type_memaccess_block,
  42    mmix_type_jsr
  43  };
  44
  45 /* Type of operands an instruction takes.  Use when parsing assembly code
  46    and disassembling.  */
  47 enum mmix_operands_type
  48  {
  49    mmix_operands_none = 0,
  50
  51    /* All operands are registers: "$X,$Y,$Z".  */
  52    mmix_operands_regs,
  53
  54    /* "$X,YZ", like SETH.  */
  55    mmix_operands_reg_yz,
  56
  57    /* The regular "$X,$Y,$Z|Z".
  58       The Z is optional; if only "$X,$Y" is given, then "$X,$Y,0" is
  59       assumed.  */
  60    mmix_operands_regs_z_opt,
  61
  62    /* The regular "$X,$Y,$Z|Z".  */
  63    mmix_operands_regs_z,
  64
  65    /* "Address"; only JMP.  Zero operands allowed unless GNU syntax.  */
  66    mmix_operands_jmp,
  67
  68    /* "$X|X,$Y,$Z|Z": PUSHGO; like "3", but X can be expressed as an
  69       integer.  */
  70    mmix_operands_pushgo,
  71
  72    /* Two registers or a register and a byte, like FLOT, possibly with
  73       rounding: "$X,$Z|Z" or "$X,ROUND_MODE,$Z|Z".  */
  74    mmix_operands_roundregs_z,
  75
  76    /* "X,YZ", POP.  Unless GNU syntax, zero or one operand is allowed.  */
  77    mmix_operands_pop,
  78
  79    /* Two registers, possibly with rounding: "$X,$Z" or
  80       "$X,ROUND_MODE,$Z".  */
  81    mmix_operands_roundregs,
  82
  83    /* "XYZ", like SYNC.  */
  84    mmix_operands_sync,
  85
  86    /* "X,$Y,$Z|Z", like SYNCD.  */
  87    mmix_operands_x_regs_z,
  88
  89    /* "$X,Y,$Z|Z", like NEG and NEGU.  The Y field is optional, default 0.  */
  90    mmix_operands_neg,
  91
  92    /* "$X,Address, like GETA or branches.  */
  93    mmix_operands_regaddr,
  94
  95    /* "$X|X,Address, like PUSHJ.  */
  96    mmix_operands_pushj,
  97
  98    /* "$X,spec_reg"; GET.  */
  99    mmix_operands_get,
 100
 101    /* "spec_reg,$Z|Z"; PUT.  */
 102    mmix_operands_put,
 103
 104    /* Two registers, "$X,$Y".  */
 105    mmix_operands_set,
 106
 107    /* "$X,0"; SAVE.  */
 108    mmix_operands_save,
 109
 110    /* "0,$Z"; UNSAVE. */
 111    mmix_operands_unsave,
 112
 113    /* "X,Y,Z"; like SWYM or TRAP.  Zero (or 1 if GNU syntax) to three
 114       operands, interpreted as 0; XYZ; X, YZ and X, Y, Z.  */
 115    mmix_operands_xyz_opt,
 116
 117    /* Just "Z", like RESUME.  Unless GNU syntax, the operand can be omitted
 118       and will then be assumed zero.  */
 119    mmix_operands_resume,
 120
 121    /* These are specials to handle that pseudo-directives are specified
 122       like ordinary insns when being mmixal-compatible.  They signify the
 123       specific pseudo-directive rather than the operands type.  */
 124
 125    /* LOC.  */
 126    mmix_operands_loc,
 127
 128    /* PREFIX.  */
 129    mmix_operands_prefix,
 130
 131    /* BYTE.  */
 132    mmix_operands_byte,
 133
 134    /* WYDE.  */
 135    mmix_operands_wyde,
 136
 137    /* TETRA.  */
 138    mmix_operands_tetra,
 139
 140    /* OCTA.  */
 141    mmix_operands_octa,
 142
 143    /* LOCAL.  */
 144    mmix_operands_local,
 145
 146    /* BSPEC.  */
 147    mmix_operands_bspec,
 148
 149    /* ESPEC.  */
 150    mmix_operands_espec,
 151  };
 152
 153 struct mmix_opcode
 154  {
 155    const char *name;
 156    unsigned long match;
 157    unsigned long lose;
 158    enum mmix_operands_type operands;
 159
 160    /* This is used by the disassembly function.  */
 161    enum mmix_insn_type type;
 162  };
 163
 164 /* Declare the actual tables.  */
 165 extern const struct mmix_opcode mmix_opcodes[];
 166
 167 /* This one is terminated with an entry with a NULL name.  */
 168 extern const struct mmix_spec_reg mmix_spec_regs[];
 169
 170 /* Some insn values we use when padding and synthesizing address loads.  */
 171 #define IMM_OFFSET_BIT 1
 172 #define COND_INV_BIT 0x8
 173 #define PRED_INV_BIT 0x10
 174
 175 #define PUSHGO_INSN_BYTE 0xbe
 176 #define GO_INSN_BYTE 0x9e
 177 #define SETL_INSN_BYTE 0xe3
 178 #define INCML_INSN_BYTE 0xe6
 179 #define INCMH_INSN_BYTE 0xe5
 180 #define INCH_INSN_BYTE 0xe4
 181 #define SWYM_INSN_BYTE 0xfd
 182 #define JMP_INSN_BYTE 0xf0
 183
 184 /* We can have 256 - 32 (local registers) - 1 ($255 is not allocatable)
 185    global registers.  */
 186 #define MAX_GREGS 223