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Diffstat (limited to 'sim/igen/ld-decode.h')
| -rw-r--r-- | sim/igen/ld-decode.h | 235 |
1 files changed, 0 insertions, 235 deletions
diff --git a/sim/igen/ld-decode.h b/sim/igen/ld-decode.h deleted file mode 100644 index b24a231266a..00000000000 --- a/sim/igen/ld-decode.h +++ /dev/null @@ -1,235 +0,0 @@ -/* This file is part of the program psim. - - Copyright (C) 1994,1995,1996, Andrew Cagney <cagney@highland.com.au> - - 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - - */ - -/* Instruction decode table: - - <decode-rule> ::= - { <option> } - ":" [ <first> ] - ":" [ <last> ] - ":" [ <force-first> ] - ":" [ <force-last> ] - ":" [ <constant-field-names> ] - ":" [ <word-nr> ] - ":" [ <format-names> ] - ":" [ <model-names> ] - ":" [ <constant> ] - ":" [ <path> { "," <path> } ] - { ":" <special-mask> - ":" [ "!" ] <special-value> - ":" <word-nr> } - <nl> - ; - - - <path> ::= <int> "," <int> ;; - - <option> ::= - <reserved-options> - | <code-options> - | <optimize-options> - | <decode-options> - | <constant> - | <search-options> - ; - - <reserved-options> ::= "zero-reserved" ; - <gen-options> ::= "array" | "switch" | "padded-switch" | "goto-switch" ; - <optimize-options> ::= "duplicate" | "combine" - <decode-options> ::= "normal" | "boolean" ; - <search-options> ::= "constants" | "variables" | "mixed" - - Ignore the below: - - - The instruction decode table contains rules that dictate how igen - is going to firstly break down the opcode table and secondly - - The table that follows is used by gen to construct a decision tree - that can identify each possible instruction. Gen then outputs this - decision tree as (according to config) a table or switch statement - as the function idecode. - - In parallel to this, as mentioned above, WITH_EXPANDED_SEMANTICS - determines of the semantic functions themselves should be expanded - in a similar way. - - <first> - <last> - - Range of bits (within the instruction) that should be searched for - an instruction field. Within such ranges, gen looks for opcodes - (constants), registers (strings) and reserved bits (slash) and - according to the rules that follows includes or excludes them from - a possible instruction field. - - <force_first> - <force_last> - - If an instruction field was found, enlarge the field size so that - it is forced to at least include bits starting from <force_first> - (<force_last>). To stop this occuring, use <force_first> = <last> - + 1 and <force_last> = <first> - 1. - - <force_reserved> - - Treat `/' (reserved) fields as a constant (zero) instead of - variable when looking for an instruction field. - - <force_expansion> - - Treat any contained register (string) fields as constant when - determining the instruction field. For the instruction decode (and - controled by IDECODE_EXPAND_SEMANTICS) this forces the expansion of - what would otherwize be non constant bits of an instruction. - - <use_switch> - - Should this table be expanded using a switch statement (val 1) and - if so, should it be padded with entries so as to force the compiler - to generate a jump table (val 2). Or a branch table (val 3). - - <special_mask> - <special_value> - <special_rule> - <special_constant> - - Special rule to fine tune how specific (or groups) of instructions - are expanded. The applicability of the rule is determined by - - <special_mask> != 0 && (instruction> & <special_mask>) == <special_value> - - Where <instruction> is obtained by looking only at constant fields - with in an instructions spec. When determining an expansion, the - rule is only considered when a node contains a single instruction. - <special_rule> can be any of: - - 0: for this instruction, expand by earlier rules - 1: expand bits <force_low> .. <force_hi> only - 2: boolean expansion of only zero/non-zero cases - 3: boolean expansion of equality of special constant - - */ - - -typedef enum { - normal_decode_rule, - boolean_rule, -} decode_special_type; - - -typedef enum { - invalid_gen, - array_gen, - switch_gen, - padded_switch_gen, - goto_switch_gen, -} decode_gen_type; - - -enum { - decode_cond_mask_field, - decode_cond_value_field, - decode_cond_word_nr_field, - nr_decode_cond_fields, -}; - -typedef struct _decode_path decode_path; -struct _decode_path { - int opcode_nr; - decode_path *parent; -}; - -typedef struct _decode_path_list decode_path_list; -struct _decode_path_list { - decode_path *path; - decode_path_list *next; -}; - - -typedef struct _decode_cond decode_cond; -struct _decode_cond { - int word_nr; - int mask[max_insn_bit_size]; - int value[max_insn_bit_size]; - int is_equal; - decode_cond *next; -}; - -typedef enum { - decode_find_mixed, - decode_find_constants, - decode_find_strings, -} decode_search_type; - -enum { - decode_options_field, - decode_first_field, - decode_last_field, - decode_force_first_field, - decode_force_last_field, - decode_constant_field_names_field, - decode_word_nr_field, - decode_format_names_field, - decode_model_names_field, - decode_paths_field, - nr_decode_fields, - min_nr_decode_fields = decode_last_field + 1, -}; - - -typedef struct _decode_table decode_table; -struct _decode_table { - line_ref *line; - decode_special_type type; - decode_gen_type gen; - decode_search_type search; - int first; - int last; - int force_first; - int force_last; - filter *constant_field_names; - int word_nr; - /* if a boolean */ - unsigned constant; - /* options */ - int with_zero_reserved; - int with_duplicates; - int with_combine; - /* conditions on the rule being applied */ - decode_path_list *paths; - filter *format_names; - filter *model_names; - decode_cond *conditions; - decode_table *next; -}; - - -extern decode_table *load_decode_table -(char *file_name); - -extern int decode_table_max_word_nr -(decode_table *rule); - -extern void dump_decode_rule -(lf *file, - char *prefix, - decode_table *rule, - char *suffix); |