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us up to version 2.17.50.20070703, at the last GPLv2 commit. Amongst others, this added upstream support for some FreeBSD-specific things that we previously had to manually hack in, such as the OSABI label support, and so on. There are also quite a number of new files, some for cpu's (e.g. SPU) that we may or may not be interested in, but those can be cleaned up later on, if needed.
459 lines
11 KiB
Plaintext
459 lines
11 KiB
Plaintext
/* itbl-parse.y
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Copyright 1997, 2002, 2003, 2005, 2006, 2007 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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%{
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/*
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Yacc grammar for instruction table entries.
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=======================================================================
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Original Instruction table specification document:
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MIPS Coprocessor Table Specification
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====================================
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This document describes the format of the MIPS coprocessor table. The
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table specifies a list of valid functions, data registers and control
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registers that can be used in coprocessor instructions. This list,
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together with the coprocessor instruction classes listed below,
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specifies the complete list of coprocessor instructions that will
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be recognized and assembled by the GNU assembler. In effect,
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this makes the GNU assembler table-driven, where the table is
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specified by the programmer.
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The table is an ordinary text file that the GNU assembler reads when
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it starts. Using the information in the table, the assembler
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generates an internal list of valid coprocessor registers and
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functions. The assembler uses this internal list in addition to the
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standard MIPS registers and instructions which are built-in to the
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assembler during code generation.
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To specify the coprocessor table when invoking the GNU assembler, use
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the command line option "--itbl file", where file is the
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complete name of the table, including path and extension.
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Examples:
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gas -t cop.tbl test.s -o test.o
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gas -t /usr/local/lib/cop.tbl test.s -o test.o
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gas --itbl d:\gnu\data\cop.tbl test.s -o test.o
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Only one table may be supplied during a single invocation of
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the assembler.
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Instruction classes
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===================
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Below is a list of the valid coprocessor instruction classes for
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any given coprocessor "z". These instructions are already recognized
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by the assembler, and are listed here only for reference.
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Class format instructions
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-------------------------------------------------
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Class1:
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op base rt offset
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LWCz rt,offset (base)
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SWCz rt,offset (base)
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Class2:
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COPz sub rt rd 0
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MTCz rt,rd
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MFCz rt,rd
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CTCz rt,rd
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CFCz rt,rd
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Class3:
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COPz CO cofun
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COPz cofun
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Class4:
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COPz BC br offset
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BCzT offset
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BCzF offset
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Class5:
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COPz sub rt rd 0
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DMFCz rt,rd
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DMTCz rt,rd
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Class6:
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op base rt offset
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LDCz rt,offset (base)
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SDCz rt,offset (base)
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Class7:
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COPz BC br offset
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BCzTL offset
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BCzFL offset
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The coprocessor table defines coprocessor-specific registers that can
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be used with all of the above classes of instructions, where
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appropriate. It also defines additional coprocessor-specific
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functions for Class3 (COPz cofun) instructions, Thus, the table allows
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the programmer to use convenient mnemonics and operands for these
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functions, instead of the COPz mmenmonic and cofun operand.
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The names of the MIPS general registers and their aliases are defined
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by the assembler and will be recognized as valid register names by the
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assembler when used (where allowed) in coprocessor instructions.
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However, the names and values of all coprocessor data and control
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register mnemonics must be specified in the coprocessor table.
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Table Grammar
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=============
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Here is the grammar for the coprocessor table:
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table -> entry*
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entry -> [z entrydef] [comment] '\n'
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entrydef -> type name val
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entrydef -> 'insn' name val funcdef ; type of entry (instruction)
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z -> 'p'['0'..'3'] ; processor number
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type -> ['dreg' | 'creg' | 'greg' ] ; type of entry (register)
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; 'dreg', 'creg' or 'greg' specifies a data, control, or general
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; register mnemonic, respectively
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name -> [ltr|dec]* ; mnemonic of register/function
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val -> [dec|hex] ; register/function number (integer constant)
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funcdef -> frange flags fields
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; bitfield range for opcode
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; list of fields' formats
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fields -> field*
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field -> [','] ftype frange flags
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flags -> ['*' flagexpr]
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flagexpr -> '[' flagexpr ']'
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flagexpr -> val '|' flagexpr
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ftype -> [ type | 'immed' | 'addr' ]
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; 'immed' specifies an immediate value; see grammar for "val" above
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; 'addr' specifies a C identifier; name of symbol to be resolved at
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; link time
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frange -> ':' val '-' val ; starting to ending bit positions, where
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; where 0 is least significant bit
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frange -> (null) ; default range of 31-0 will be assumed
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comment -> [';'|'#'] [char]*
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char -> any printable character
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ltr -> ['a'..'z'|'A'..'Z']
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dec -> ['0'..'9']* ; value in decimal
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hex -> '0x'['0'..'9' | 'a'..'f' | 'A'..'F']* ; value in hexadecimal
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Examples
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========
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Example 1:
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The table:
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p1 dreg d1 1 ; data register "d1" for COP1 has value 1
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p1 creg c3 3 ; ctrl register "c3" for COP1 has value 3
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p3 func fill 0x1f:24-20 ; function "fill" for COP3 has value 31 and
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; no fields
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will allow the assembler to accept the following coprocessor instructions:
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LWC1 d1,0x100 ($2)
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fill
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Here, the general purpose register "$2", and instruction "LWC1", are standard
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mnemonics built-in to the MIPS assembler.
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Example 2:
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The table:
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p3 dreg d3 3 ; data register "d3" for COP3 has value 3
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p3 creg c2 22 ; control register "c2" for COP3 has value 22
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p3 func fee 0x1f:24-20 dreg:17-13 creg:12-8 immed:7-0
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; function "fee" for COP3 has value 31, and 3 fields
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; consisting of a data register, a control register,
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; and an immediate value.
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will allow the assembler to accept the following coprocessor instruction:
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fee d3,c2,0x1
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and will emit the object code:
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31-26 25 24-20 19-18 17-13 12-8 7-0
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COPz CO fun dreg creg immed
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010011 1 11111 00 00011 10110 00000001
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0x4ff07601
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Example 3:
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The table:
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p3 dreg d3 3 ; data register "d3" for COP3 has value 3
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p3 creg c2 22 ; control register "c2" for COP3 has value 22
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p3 func fuu 0x01f00001 dreg:17-13 creg:12-8
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will allow the assembler to accept the following coprocessor
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instruction:
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fuu d3,c2
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and will emit the object code:
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31-26 25 24-20 19-18 17-13 12-8 7-0
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COPz CO fun dreg creg
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010011 1 11111 00 00011 10110 00000001
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0x4ff07601
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In this way, the programmer can force arbitrary bits of an instruction
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to have predefined values.
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=======================================================================
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Additional notes:
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Encoding of ranges:
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To handle more than one bit position range within an instruction,
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use 0s to mask out the ranges which don't apply.
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May decide to modify the syntax to allow commas separate multiple
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ranges within an instruction (range','range).
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Changes in grammar:
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The number of parms argument to the function entry
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was deleted from the original format such that we now count the fields.
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----
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FIXME! should really change lexical analyzer
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to recognize 'dreg' etc. in context sensitive way.
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Currently function names or mnemonics may be incorrectly parsed as keywords
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FIXME! hex is ambiguous with any digit
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*/
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#include "as.h"
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#include "itbl-lex.h"
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#include "itbl-ops.h"
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/* #define DEBUG */
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#ifdef DEBUG
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#ifndef DBG_LVL
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#define DBG_LVL 1
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#endif
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#else
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#define DBG_LVL 0
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#endif
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#if DBG_LVL >= 1
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#define DBG(x) printf x
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#else
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#define DBG(x)
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#endif
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#if DBG_LVL >= 2
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#define DBGL2(x) printf x
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#else
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#define DBGL2(x)
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#endif
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static int sbit, ebit;
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static struct itbl_entry *insn=0;
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static int yyerror (const char *);
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%}
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%union
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{
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char *str;
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int num;
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int processor;
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unsigned long val;
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}
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%token DREG CREG GREG IMMED ADDR INSN NUM ID NL PNUM
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%type <val> value flags flagexpr
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%type <num> number NUM ftype regtype pnum PNUM
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%type <str> ID name
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%start insntbl
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%%
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insntbl:
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entrys
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;
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entrys:
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entry entrys
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;
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entry:
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pnum regtype name value NL
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{
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DBG (("line %d: entry pnum=%d type=%d name=%s value=x%x\n",
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insntbl_line, $1, $2, $3, $4));
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itbl_add_reg ($1, $2, $3, $4);
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}
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| pnum INSN name value range flags
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{
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DBG (("line %d: entry pnum=%d type=INSN name=%s value=x%x",
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insntbl_line, $1, $3, $4));
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DBG ((" sbit=%d ebit=%d flags=0x%x\n", sbit, ebit, $6));
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insn=itbl_add_insn ($1, $3, $4, sbit, ebit, $6);
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}
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fieldspecs NL
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{}
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| NL
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| error NL
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;
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fieldspecs:
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',' fieldspec fieldspecs
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| fieldspec fieldspecs
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;
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ftype:
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regtype
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{
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DBGL2 (("ftype\n"));
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$$ = $1;
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}
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| ADDR
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{
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DBGL2 (("addr\n"));
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$$ = ADDR;
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}
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| IMMED
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{
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DBGL2 (("immed\n"));
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$$ = IMMED;
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}
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;
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fieldspec:
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ftype range flags
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{
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DBG (("line %d: field type=%d sbit=%d ebit=%d, flags=0x%x\n",
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insntbl_line, $1, sbit, ebit, $3));
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itbl_add_operand (insn, $1, sbit, ebit, $3);
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}
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;
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flagexpr:
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NUM '|' flagexpr
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{
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$$ = $1 | $3;
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}
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| '[' flagexpr ']'
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{
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$$ = $2;
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}
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| NUM
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{
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$$ = $1;
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}
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;
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flags:
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'*' flagexpr
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{
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DBGL2 (("flags=%d\n", $2));
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$$ = $2;
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}
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{
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$$ = 0;
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}
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;
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range:
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':' NUM '-' NUM
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{
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DBGL2 (("range %d %d\n", $2, $4));
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sbit = $2;
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ebit = $4;
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}
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{
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sbit = 31;
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ebit = 0;
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}
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;
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pnum:
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PNUM
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{
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DBGL2 (("pnum=%d\n",$1));
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$$ = $1;
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}
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;
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regtype:
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DREG
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{
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DBGL2 (("dreg\n"));
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$$ = DREG;
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}
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| CREG
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{
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DBGL2 (("creg\n"));
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$$ = CREG;
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}
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| GREG
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{
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DBGL2 (("greg\n"));
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$$ = GREG;
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}
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;
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name:
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ID
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{
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DBGL2 (("name=%s\n",$1));
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$$ = $1;
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}
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;
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number:
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NUM
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{
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DBGL2 (("num=%d\n",$1));
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$$ = $1;
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}
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;
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value:
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NUM
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{
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DBGL2 (("val=x%x\n",$1));
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$$ = $1;
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}
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;
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%%
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static int
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yyerror (msg)
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const char *msg;
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{
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printf ("line %d: %s\n", insntbl_line, msg);
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return 0;
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}
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