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Diffstat (limited to 'sim/ppc/ld-decode.h')
-rw-r--r-- | sim/ppc/ld-decode.h | 139 |
1 files changed, 0 insertions, 139 deletions
diff --git a/sim/ppc/ld-decode.h b/sim/ppc/ld-decode.h deleted file mode 100644 index 30992ee..0000000 --- a/sim/ppc/ld-decode.h +++ /dev/null @@ -1,139 +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: - - <options>:<first>:<last>:<force-first>:<force-last>:<force-expand>:<special>... - - - - 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_slash> - - Treat `/' fields as a constant 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, - expand_forced_rule, - boolean_rule, - nr_decode_rules -} decode_special_type; - -typedef enum { - array_gen, - switch_gen, - padded_switch_gen, - goto_gen, - nr_decode_gen_types, -} decode_gen_type; - - -typedef struct _decode_table decode_table; -struct _decode_table { - decode_special_type type; - decode_gen_type gen; - int first; - int last; - int force_first; - int force_last; - int force_slash; - char *force_expansion; - unsigned special_mask; - unsigned special_value; - unsigned special_constant; - decode_table *next; -}; - - -extern decode_table *load_decode_table -(char *file_name, - int hi_bit_nr); - -extern void dump_decode_rule -(decode_table *rule, - int indent); |