sim/igen/gen-semantics.h

   1 /* The IGEN simulator generator for GDB, the GNU Debugger.
   2
   3    Copyright 2002-2013 Free Software Foundation, Inc.
   4
   5    Contributed by Andrew Cagney.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22
  23 /* Creates the files semantics.[hc].
  24
  25    The generated file semantics contains functions that implement the
  26    operations required to model a single target processor instruction.
  27
  28    Several different variations on the semantics file can be created:
  29
  30         o       uncached
  31
  32                 No instruction cache exists.  The semantic function
  33                 needs to generate any required values locally.
  34
  35         o       cached - separate cracker and semantic
  36
  37                 Two independant functions are created.  Firstly the
  38                 function that cracks an instruction entering it into a
  39                 cache and secondly the semantic function propper that
  40                 uses the cache.
  41
  42         o       cached - semantic + cracking semantic
  43
  44                 The function that cracks the instruction and enters
  45                 all values into the cache also contains a copy of the
  46                 semantic code (avoiding the need to call both the
  47                 cracker and the semantic function when there is a
  48                 cache miss).
  49
  50    For each of these general forms, several refinements can occure:
  51
  52         o       do/don't duplicate/expand semantic functions
  53
  54                 As a consequence of decoding an instruction, the
  55                 decoder, as part of its table may have effectivly made
  56                 certain of the variable fields in an instruction
  57                 constant. Separate functions for each of the
  58                 alternative values for what would have been treated as
  59                 a variable part can be created.
  60
  61         o       use cache struct directly.
  62
  63                 When a cracking cache is present, the semantic
  64                 functions can be generated to either hold intermediate
  65                 cache values in local variables or always refer to the
  66                 contents of the cache directly. */
  67
  68
  69
  70
  71
  72
  73 extern void print_semantic_declaration
  74   (lf *file,
  75    insn_entry * insn,
  76    opcode_bits *bits, insn_opcodes *opcodes, int nr_prefetched_words);
  77
  78 extern void print_semantic_definition
  79   (lf *file,
  80    insn_entry * insn,
  81    opcode_bits *bits,
  82    insn_opcodes *opcodes, cache_entry *cache_rules, int nr_prefetched_words);
  83
  84
  85 typedef enum
  86 {
  87   invalid_illegal,
  88   invalid_fp_unavailable,
  89   invalid_wrong_slot,
  90 }
  91 invalid_type;
  92
  93 extern void print_idecode_invalid
  94   (lf *file, const char *result, invalid_type type);
  95
  96 extern void print_semantic_body
  97   (lf *file,
  98    insn_entry * instruction,
  99    opcode_bits *expanded_bits, insn_opcodes *opcodes);