[deliverable/binutils-gdb.git] / gas / itbl-parse.y

/* itbl-parse.y
   Copyright 1997 Free Software Foundation, Inc.

   This file is part of GAS, the GNU Assembler.

   GAS 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, or (at your option)
   any later version.

   GAS 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 GAS; see the file COPYING.  If not, write to the Free
   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
   02111-1307, USA.  */

%{

/* 

Yacc grammar for instruction table entries.

=======================================================================
Original Instruction table specification document:

	    MIPS Coprocessor Table Specification
	    ====================================

This document describes the format of the MIPS coprocessor table.  The
table specifies a list of valid functions, data registers and control
registers that can be used in coprocessor instructions.  This list,
together with the coprocessor instruction classes listed below,
specifies the complete list of coprocessor instructions that will
be recognized and assembled by the GNU assembler.  In effect,
this makes the GNU assembler table-driven, where the table is
specified by the programmer.

The table is an ordinary text file that the GNU assembler reads when
it starts.  Using the information in the table, the assembler
generates an internal list of valid coprocessor registers and
functions.  The assembler uses this internal list in addition to the
standard MIPS registers and instructions which are built-in to the 
assembler during code generation.

To specify the coprocessor table when invoking the GNU assembler, use
the command line option "--itbl file", where file is the
complete name of the table, including path and extension.

Examples:

	    gas -t cop.tbl test.s -o test.o
	    gas -t /usr/local/lib/cop.tbl test.s -o test.o
	    gas --itbl d:\gnu\data\cop.tbl test.s -o test.o

Only one table may be supplied during a single invocation of
the assembler.


Instruction classes
===================

Below is a list of the valid coprocessor instruction classes for
any given coprocessor "z".  These instructions are already recognized
by the assembler, and are listed here only for reference.

Class   format	    	    	      instructions
-------------------------------------------------
Class1:
	op base rt offset
	    	    	    	    	    	    	    LWCz rt,offset (base)
	    	    	    	    	    	    	    SWCz rt,offset (base)
Class2:
	COPz sub rt rd 0
	    	    	    	    	    	    	    MTCz rt,rd
	    	    	    	    	    	    	    MFCz rt,rd
	    	    	    	    	    	    	    CTCz rt,rd
	    	    	    	    	    	    	    CFCz rt,rd
Class3:
	COPz CO cofun
	    	    	    	    	    	    	    COPz cofun
Class4:
	COPz BC br offset
	    	    	    	    	    	    	    BCzT offset
	    	    	    	    	    	    	    BCzF offset
Class5:
	COPz sub rt rd 0
	    	    	    	    	    	    	    DMFCz rt,rd
	    	    	    	    	    	    	    DMTCz rt,rd
Class6:
	op base rt offset
	    	    	    	    	    	    	    LDCz rt,offset (base)
	    	    	    	    	    	    	    SDCz rt,offset (base)
Class7:
	COPz BC br offset
	    	    	    	    	    	    	    BCzTL offset
	    	    	    	    	    	    	    BCzFL offset

The coprocessor table defines coprocessor-specific registers that can
be used with all of the above classes of instructions, where
appropriate.  It also defines additional coprocessor-specific
functions for Class3 (COPz cofun) instructions, Thus, the table allows
the programmer to use convenient mnemonics and operands for these
functions, instead of the COPz mmenmonic and cofun operand.

The names of the MIPS general registers and their aliases are defined
by the assembler and will be recognized as valid register names by the
assembler when used (where allowed) in coprocessor instructions.
However, the names and values of all coprocessor data and control
register mnemonics must be specified in the coprocessor table.


Table Grammar
=============

Here is the grammar for the coprocessor table:

	    table -> entry*

	    entry -> [z entrydef] [comment] '\n'

	    entrydef -> type name val
	    entrydef -> 'insn' name val funcdef ; type of entry (instruction)

	    z -> 'p'['0'..'3']	    	     ; processor number 
	    type -> ['dreg' | 'creg' | 'greg' ]	     ; type of entry (register)
	; 'dreg', 'creg' or 'greg' specifies a data, control, or general
	;	    register mnemonic, respectively
	    name -> [ltr|dec]*	    	     ; mnemonic of register/function
	    val -> [dec|hex]	    	     ; register/function number (integer constant)

	    funcdef -> frange flags fields
	    	    	    	; bitfield range for opcode
	    	    	    	; list of fields' formats
	    fields -> field*
	    field -> [','] ftype frange flags
	    flags -> ['*' flagexpr]
	    flagexpr -> '[' flagexpr ']'
	    flagexpr -> val '|' flagexpr 
	    ftype -> [ type | 'immed' | 'addr' ]
	; 'immed' specifies an immediate value; see grammar for "val" above
	    	; 'addr' specifies a C identifier; name of symbol to be resolved at 
	;	    link time
	    frange -> ':' val '-' val	; starting to ending bit positions, where
	    	    	    	; where 0 is least significant bit
	    frange -> (null)	    	; default range of 31-0 will be assumed

	    comment -> [';'|'#'] [char]*
	    char -> any printable character
	    ltr -> ['a'..'z'|'A'..'Z'] 
	    dec -> ['0'..'9']*	    	    	    	    	     ; value in decimal
	    hex -> '0x'['0'..'9' | 'a'..'f' | 'A'..'F']*	; value in hexadecimal 


Examples
========

Example 1:

The table:

	    p1 dreg d1 1	     ; data register "d1" for COP1 has value 1
	    p1 creg c3 3	     ; ctrl register "c3" for COP1 has value 3
	    p3 func fill 0x1f:24-20	      ; function "fill" for COP3 has value 31 and 
	    	    	; no fields

will allow the assembler to accept the following coprocessor instructions:

	    LWC1 d1,0x100 ($2)
	    fill

Here, the general purpose register "$2", and instruction "LWC1", are standard 
mnemonics built-in to the MIPS assembler.  


Example 2:

The table:

	    p3 dreg d3 3	     ; data register "d3" for COP3 has value 3
	    p3 creg c2 22	     ; control register "c2" for COP3 has value 22
	    p3 func fee 0x1f:24-20 dreg:17-13 creg:12-8 immed:7-0 
	    	; function "fee" for COP3 has value 31, and 3 fields 
	    	; consisting of a data register, a control register, 
	    	; and an immediate value.

will allow the assembler to accept the following coprocessor instruction:

	    fee d3,c2,0x1

and will emit the object code:

	    31-26  25 24-20 19-18  17-13 12-8  7-0
	    COPz   CO fun	    	      dreg  creg  immed
	    010011 1  11111 00	     00011 10110 00000001 

	    0x4ff07601


Example 3:

The table:

	    p3 dreg d3 3	     ; data register "d3" for COP3 has value 3
	    p3 creg c2 22	     ; control register "c2" for COP3 has value 22
	    p3 func fuu 0x01f00001 dreg:17-13 creg:12-8

will allow the assembler to accept the following coprocessor
instruction:

	    fuu d3,c2

and will emit the object code:

	    31-26  25 24-20 19-18  17-13 12-8  7-0
	    COPz   CO fun	    	      dreg  creg  
	    010011 1  11111 00	     00011 10110 00000001 

	    0x4ff07601

In this way, the programmer can force arbitrary bits of an instruction
to have predefined values.

=======================================================================
Additional notes:

Encoding of ranges:
To handle more than one bit position range within an instruction,
use 0s to mask out the ranges which don't apply.
May decide to modify the syntax to allow commas separate multiple 
ranges within an instruction (range','range).

Changes in grammar:
	The number of parms argument to the function entry
was deleted from the original format such that we now count the fields.

----
FIXME! should really change lexical analyzer 
to recognize 'dreg' etc. in context sensitive way.
Currently function names or mnemonics may be incorrectly parsed as keywords

FIXME! hex is ambiguous with any digit

*/

#include <stdio.h>
#include "itbl-ops.h"

/* #define DEBUG */

#ifdef DEBUG
#ifndef DBG_LVL
#define DBG_LVL 1
#endif
#else
#define DBG_LVL 0
#endif

#if DBG_LVL >= 1
#define DBG(x) printf x
#else
#define DBG(x) 
#endif

#if DBG_LVL >= 2
#define DBGL2(x) printf x
#else
#define DBGL2(x) 
#endif

static int sbit, ebit;
static struct itbl_entry *insn=0;
extern int insntbl_line;
int yyparse PARAMS ((void));
int yylex PARAMS ((void));
static int yyerror PARAMS ((const char *));

%}

%union 
  {
    char *str;
    int num;
    int processor;
    unsigned long val;
  }

%token	    DREG CREG GREG IMMED ADDR INSN NUM ID NL PNUM
%type	    <val> value flags flagexpr
%type	    <num> number NUM ftype regtype pnum PNUM
%type	    <str> ID name

%start insntbl

%%

insntbl:
	entrys
	;

entrys:
	entry entrys
	|
	;

entry:
	pnum regtype name value NL
	  {
	    DBG (("line %d: entry pnum=%d type=%d name=%s value=x%x\n", 
	    	    insntbl_line, $1, $2, $3, $4));
	    itbl_add_reg ($1, $2, $3, $4);
	  }
	| pnum INSN name value range flags
	  {
	    DBG (("line %d: entry pnum=%d type=INSN name=%s value=x%x",
	    	    insntbl_line, $1, $3, $4));
	    DBG ((" sbit=%d ebit=%d flags=0x%x\n", sbit, ebit, $6));
	    insn=itbl_add_insn ($1, $3, $4, sbit, ebit, $6);
	  }
	fieldspecs NL
	  {}
	| NL
	| error NL
	;

fieldspecs:
	',' fieldspec fieldspecs
	| fieldspec fieldspecs
	|
	;

ftype:
	regtype 
	  {
	    DBGL2 (("ftype\n"));
	    $$ = $1;
	  }
	| ADDR 
	  {
	    DBGL2 (("addr\n"));
	    $$ = ADDR;
	  }
	| IMMED
	  {
	    DBGL2 (("immed\n"));
	    $$ = IMMED;
	  }
	;

fieldspec:
	ftype range flags
	  {
	    DBG (("line %d: field type=%d sbit=%d ebit=%d, flags=0x%x\n", 
	    	    insntbl_line, $1, sbit, ebit, $3));
	    itbl_add_operand (insn, $1, sbit, ebit, $3);
	  }
	;

flagexpr:
	NUM '|' flagexpr
	  {
	    $$ = $1 | $3;
	  }
	| '[' flagexpr ']'
	  {
	    $$ = $2;
	  }
	| NUM
	  {
	    $$ = $1;
	  }
	;

flags:
	'*' flagexpr
	  {
	    DBGL2 (("flags=%d\n", $2));
	    $$ = $2;
	  }
	| 
	  {
	    $$ = 0;
	  }
	;

range:
	':' NUM '-' NUM
	  {
	    DBGL2 (("range %d %d\n", $2, $4));
	    sbit = $2;
	    ebit = $4;
	  }
	|
	  {
	    sbit = 31;
	    ebit = 0;
	  }
	;
	    
pnum:
	PNUM
	  {
	    DBGL2 (("pnum=%d\n",$1));
	    $$ = $1;
	  }
	;

regtype:
	     DREG
	  {
	    DBGL2 (("dreg\n"));
	    $$ = DREG;
	  }
	| CREG
	  {
	    DBGL2 (("creg\n"));
	    $$ = CREG;
	  }
	| GREG
	  {
	    DBGL2 (("greg\n"));
	    $$ = GREG;
	  }
	;

name:
	ID
	  {
	    DBGL2 (("name=%s\n",$1));
	    $$ = $1; 
	  }
	;

number:
	NUM
	  {
	    DBGL2 (("num=%d\n",$1));
	    $$ = $1;
	  }
	;

value:
	NUM
	  {
	    DBGL2 (("val=x%x\n",$1));
	    $$ = $1;
	  }
	;
%%

static int
yyerror (msg)
     const char *msg;
{
  printf ("line %d: %s\n", insntbl_line, msg);
  return 0;
}
Commit	Line	Data
252b5132	1	/* itbl-parse.y
f7e42eb4	2	Copyright 1997 Free Software Foundation, Inc.
252b5132 RH	3
	4	This file is part of GAS, the GNU Assembler.
	5
	6	GAS is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2, or (at your option)
	9	any later version.
	10
	11	GAS is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with GAS; see the file COPYING. If not, write to the Free
	18	Software Foundation, 59 Temple Place - Suite 330, Boston, MA
	19	02111-1307, USA. */
	20
	21	%{
	22
	23	/*
	24
	25	Yacc grammar for instruction table entries.
	26
	27	=======================================================================
	28	Original Instruction table specification document:
	29
	30	MIPS Coprocessor Table Specification
	31	====================================
	32
	33	This document describes the format of the MIPS coprocessor table. The
	34	table specifies a list of valid functions, data registers and control
	35	registers that can be used in coprocessor instructions. This list,
	36	together with the coprocessor instruction classes listed below,
	37	specifies the complete list of coprocessor instructions that will
	38	be recognized and assembled by the GNU assembler. In effect,
	39	this makes the GNU assembler table-driven, where the table is
	40	specified by the programmer.
	41
	42	The table is an ordinary text file that the GNU assembler reads when
	43	it starts. Using the information in the table, the assembler
	44	generates an internal list of valid coprocessor registers and
	45	functions. The assembler uses this internal list in addition to the
	46	standard MIPS registers and instructions which are built-in to the
	47	assembler during code generation.
	48
	49	To specify the coprocessor table when invoking the GNU assembler, use
	50	the command line option "--itbl file", where file is the
	51	complete name of the table, including path and extension.
	52
	53	Examples:
	54
	55	gas -t cop.tbl test.s -o test.o
	56	gas -t /usr/local/lib/cop.tbl test.s -o test.o
	57	gas --itbl d:\gnu\data\cop.tbl test.s -o test.o
	58
	59	Only one table may be supplied during a single invocation of
	60	the assembler.
	61
	62
	63	Instruction classes
	64	===================
	65
	66	Below is a list of the valid coprocessor instruction classes for
67	any given coprocessor "z". These instructions are already recognized
68	by the assembler, and are listed here only for reference.
69
70	Class format instructions
71	-------------------------------------------------
72	Class1:
73	op base rt offset
74	LWCz rt,offset (base)
75	SWCz rt,offset (base)
76	Class2:
77	COPz sub rt rd 0
78	MTCz rt,rd
79	MFCz rt,rd
80	CTCz rt,rd
81	CFCz rt,rd
82	Class3:
83	COPz CO cofun
84	COPz cofun
85	Class4:
86	COPz BC br offset
87	BCzT offset
88	BCzF offset
89	Class5:
90	COPz sub rt rd 0
91	DMFCz rt,rd
92	DMTCz rt,rd
93	Class6:
94	op base rt offset
95	LDCz rt,offset (base)
96	SDCz rt,offset (base)
97	Class7:
98	COPz BC br offset
99	BCzTL offset
100	BCzFL offset
101
102	The coprocessor table defines coprocessor-specific registers that can
103	be used with all of the above classes of instructions, where
104	appropriate. It also defines additional coprocessor-specific
105	functions for Class3 (COPz cofun) instructions, Thus, the table allows
106	the programmer to use convenient mnemonics and operands for these
107	functions, instead of the COPz mmenmonic and cofun operand.
108
109	The names of the MIPS general registers and their aliases are defined
110	by the assembler and will be recognized as valid register names by the
111	assembler when used (where allowed) in coprocessor instructions.
112	However, the names and values of all coprocessor data and control
113	register mnemonics must be specified in the coprocessor table.
114
115
116	Table Grammar
117	=============
118
119	Here is the grammar for the coprocessor table:
120
121	table -> entry*
122
123	entry -> [z entrydef] [comment] '\n'
124
125	entrydef -> type name val
126	entrydef -> 'insn' name val funcdef ; type of entry (instruction)
127
128	z -> 'p'['0'..'3'] ; processor number
129	type -> ['dreg' \| 'creg' \| 'greg' ] ; type of entry (register)
130	; 'dreg', 'creg' or 'greg' specifies a data, control, or general
131	; register mnemonic, respectively
132	name -> [ltr\|dec]* ; mnemonic of register/function
133	val -> [dec\|hex] ; register/function number (integer constant)
134
135	funcdef -> frange flags fields
136	; bitfield range for opcode
137	; list of fields' formats
138	fields -> field*
139	field -> [','] ftype frange flags
140	flags -> ['*' flagexpr]
141	flagexpr -> '[' flagexpr ']'
142	flagexpr -> val '\|' flagexpr
143	ftype -> [ type \| 'immed' \| 'addr' ]
144	; 'immed' specifies an immediate value; see grammar for "val" above
145	; 'addr' specifies a C identifier; name of symbol to be resolved at
146	; link time
147	frange -> ':' val '-' val ; starting to ending bit positions, where
148	; where 0 is least significant bit
149	frange -> (null) ; default range of 31-0 will be assumed
150
151	comment -> [';'\|'#'] [char]*
152	char -> any printable character
153	ltr -> ['a'..'z'\|'A'..'Z']
154	dec -> ['0'..'9']* ; value in decimal
47eebc20	155	hex -> '0x'['0'..'9' \| 'a'..'f' \| 'A'..'F']* ; value in hexadecimal
252b5132 RH	156
	157
	158	Examples
	159	========
	160
	161	Example 1:
	162
	163	The table:
	164
	165	p1 dreg d1 1 ; data register "d1" for COP1 has value 1
	166	p1 creg c3 3 ; ctrl register "c3" for COP1 has value 3
	167	p3 func fill 0x1f:24-20 ; function "fill" for COP3 has value 31 and
	168	; no fields
	169
	170	will allow the assembler to accept the following coprocessor instructions:
	171
	172	LWC1 d1,0x100 ($2)
	173	fill
	174
	175	Here, the general purpose register "$2", and instruction "LWC1", are standard
	176	mnemonics built-in to the MIPS assembler.
	177
	178
	179	Example 2:
	180
	181	The table:
	182
	183	p3 dreg d3 3 ; data register "d3" for COP3 has value 3
	184	p3 creg c2 22 ; control register "c2" for COP3 has value 22
	185	p3 func fee 0x1f:24-20 dreg:17-13 creg:12-8 immed:7-0
	186	; function "fee" for COP3 has value 31, and 3 fields
	187	; consisting of a data register, a control register,
	188	; and an immediate value.
	189
	190	will allow the assembler to accept the following coprocessor instruction:
	191
	192	fee d3,c2,0x1
	193
	194	and will emit the object code:
	195
	196	31-26 25 24-20 19-18 17-13 12-8 7-0
	197	COPz CO fun dreg creg immed
	198	010011 1 11111 00 00011 10110 00000001
	199
	200	0x4ff07601
	201
	202
	203	Example 3:
	204
	205	The table:
	206
	207	p3 dreg d3 3 ; data register "d3" for COP3 has value 3
	208	p3 creg c2 22 ; control register "c2" for COP3 has value 22
	209	p3 func fuu 0x01f00001 dreg:17-13 creg:12-8
	210
	211	will allow the assembler to accept the following coprocessor
	212	instruction:
	213
	214	fuu d3,c2
	215
	216	and will emit the object code:
	217
	218	31-26 25 24-20 19-18 17-13 12-8 7-0
	219	COPz CO fun dreg creg
220	010011 1 11111 00 00011 10110 00000001
221
222	0x4ff07601
223
224	In this way, the programmer can force arbitrary bits of an instruction
225	to have predefined values.
226
227	=======================================================================
228	Additional notes:
229
230	Encoding of ranges:
231	To handle more than one bit position range within an instruction,
232	use 0s to mask out the ranges which don't apply.
233	May decide to modify the syntax to allow commas separate multiple
234	ranges within an instruction (range','range).
235
236	Changes in grammar:
237	The number of parms argument to the function entry
238	was deleted from the original format such that we now count the fields.
239
240	----
241	FIXME! should really change lexical analyzer
47eebc20	242	to recognize 'dreg' etc. in context sensitive way.
252b5132 RH	243	Currently function names or mnemonics may be incorrectly parsed as keywords
	244
	245	FIXME! hex is ambiguous with any digit
	246
	247	*/
	248
	249	#include <stdio.h>
	250	#include "itbl-ops.h"
	251
	252	/* #define DEBUG */
	253
	254	#ifdef DEBUG
	255	#ifndef DBG_LVL
	256	#define DBG_LVL 1
	257	#endif
	258	#else
	259	#define DBG_LVL 0
	260	#endif
	261
	262	#if DBG_LVL >= 1
	263	#define DBG(x) printf x
	264	#else
	265	#define DBG(x)
	266	#endif
	267
	268	#if DBG_LVL >= 2
	269	#define DBGL2(x) printf x
	270	#else
	271	#define DBGL2(x)
	272	#endif
	273
	274	static int sbit, ebit;
	275	static struct itbl_entry *insn=0;
	276	extern int insntbl_line;
	277	int yyparse PARAMS ((void));
	278	int yylex PARAMS ((void));
	279	static int yyerror PARAMS ((const char *));
	280
	281	%}
	282
	283	%union
	284	{
	285	char *str;
	286	int num;
	287	int processor;
	288	unsigned long val;
	289	}
	290
	291	%token DREG CREG GREG IMMED ADDR INSN NUM ID NL PNUM
	292	%type <val> value flags flagexpr
	293	%type <num> number NUM ftype regtype pnum PNUM
	294	%type <str> ID name
	295
	296	%start insntbl
	297
	298	%%
	299
	300	insntbl:
	301	entrys
	302	;
	303
	304	entrys:
	305	entry entrys
	306	\|
307	;
308
309	entry:
310	pnum regtype name value NL
311	{
312	DBG (("line %d: entry pnum=%d type=%d name=%s value=x%x\n",
313	insntbl_line, $1, $2, $3, $4));
314	itbl_add_reg ($1, $2, $3, $4);
315	}
316	\| pnum INSN name value range flags
317	{
318	DBG (("line %d: entry pnum=%d type=INSN name=%s value=x%x",
319	insntbl_line, $1, $3, $4));
320	DBG ((" sbit=%d ebit=%d flags=0x%x\n", sbit, ebit, $6));
321	insn=itbl_add_insn ($1, $3, $4, sbit, ebit, $6);
322	}
323	fieldspecs NL
311797d5	324	{}
252b5132 RH	325	\| NL
	326	\| error NL
	327	;
	328
	329	fieldspecs:
	330	',' fieldspec fieldspecs
	331	\| fieldspec fieldspecs
	332	\|
	333	;
	334
	335	ftype:
	336	regtype
	337	{
	338	DBGL2 (("ftype\n"));
	339	$$ = $1;
	340	}
	341	\| ADDR
	342	{
	343	DBGL2 (("addr\n"));
	344	$$ = ADDR;
	345	}
	346	\| IMMED
	347	{
	348	DBGL2 (("immed\n"));
	349	$$ = IMMED;
	350	}
	351	;
	352
	353	fieldspec:
	354	ftype range flags
	355	{
	356	DBG (("line %d: field type=%d sbit=%d ebit=%d, flags=0x%x\n",
	357	insntbl_line, $1, sbit, ebit, $3));
	358	itbl_add_operand (insn, $1, sbit, ebit, $3);
	359	}
	360	;
	361
	362	flagexpr:
	363	NUM '\|' flagexpr
	364	{
	365	$$ = $1 \| $3;
	366	}
	367	\| '[' flagexpr ']'
	368	{
	369	$$ = $2;
	370	}
	371	\| NUM
	372	{
	373	$$ = $1;
	374	}
	375	;
	376
	377	flags:
	378	'*' flagexpr
	379	{
	380	DBGL2 (("flags=%d\n", $2));
	381	$$ = $2;
	382	}
	383	\|
	384	{
	385	$$ = 0;
	386	}
	387	;
	388
389	range:
390	':' NUM '-' NUM
391	{
392	DBGL2 (("range %d %d\n", $2, $4));
393	sbit = $2;
394	ebit = $4;
395	}
396	\|
397	{
398	sbit = 31;
399	ebit = 0;
400	}
401	;
402
403	pnum:
404	PNUM
405	{
406	DBGL2 (("pnum=%d\n",$1));
407	$$ = $1;
408	}
409	;
410
411	regtype:
412	DREG
413	{
414	DBGL2 (("dreg\n"));
415	$$ = DREG;
416	}
417	\| CREG
418	{
419	DBGL2 (("creg\n"));
420	$$ = CREG;
421	}
422	\| GREG
423	{
424	DBGL2 (("greg\n"));
425	$$ = GREG;
426	}
427	;
428
429	name:
430	ID
431	{
432	DBGL2 (("name=%s\n",$1));
433	$$ = $1;
434	}
435	;
436
437	number:
438	NUM
439	{
440	DBGL2 (("num=%d\n",$1));
441	$$ = $1;
442	}
443	;
444
445	value:
446	NUM
447	{
448	DBGL2 (("val=x%x\n",$1));
449	$$ = $1;
450	}
451	;
452	%%
453
454	static int
455	yyerror (msg)
456	const char *msg;
457	{
458	printf ("line %d: %s\n", insntbl_line, msg);
459	return 0;
460	}