/* itbl-parse.y
- Copyright 1997, 2002, 2003, 2005 Free Software Foundation, Inc.
+ Copyright (C) 1997-2020 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)
+ the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
%{
-/*
+/*
Yacc grammar for instruction table entries.
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
+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
entrydef -> type name val
entrydef -> 'insn' name val funcdef ; type of entry (instruction)
- z -> 'p'['0'..'3'] ; processor number
+ 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
field -> [','] ftype frange flags
flags -> ['*' flagexpr]
flagexpr -> '[' flagexpr ']'
- flagexpr -> val '|' 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
+ ; '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
comment -> [';'|'#'] [char]*
char -> any printable character
- ltr -> ['a'..'z'|'A'..'Z']
+ ltr -> ['a'..'z'|'A'..'Z']
dec -> ['0'..'9']* ; value in decimal
- hex -> '0x'['0'..'9' | 'a'..'f' | 'A'..'F']* ; value in hexadecimal
+ hex -> '0x'['0'..'9' | 'a'..'f' | 'A'..'F']* ; value in hexadecimal
Examples
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
+ 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.
+Here, the general purpose register "$2", and instruction "LWC1", are standard
+mnemonics built-in to the MIPS assembler.
Example 2:
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,
+ 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:
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
+ 010011 1 11111 00 00011 10110 00000001
0x4ff07601
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
+ COPz CO fun dreg creg
+ 010011 1 11111 00 00011 10110 00000001
0x4ff07601
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
+May decide to modify the syntax to allow commas separate multiple
ranges within an instruction (range','range).
Changes in grammar:
was deleted from the original format such that we now count the fields.
----
-FIXME! should really change lexical analyzer
+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
*/
-#include <stdio.h>
+#include "as.h"
#include "itbl-lex.h"
#include "itbl-ops.h"
#if DBG_LVL >= 1
#define DBG(x) printf x
#else
-#define DBG(x)
+#define DBG(x)
#endif
#if DBG_LVL >= 2
#define DBGL2(x) printf x
#else
-#define DBGL2(x)
+#define DBGL2(x)
#endif
static int sbit, ebit;
static struct itbl_entry *insn=0;
-static int yyerror PARAMS ((const char *));
+static int yyerror (const char *);
%}
-%union
+%union
{
char *str;
int num;
entry:
pnum regtype name value NL
{
- DBG (("line %d: entry pnum=%d type=%d name=%s value=x%x\n",
+ 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);
}
;
ftype:
- regtype
+ regtype
{
DBGL2 (("ftype\n"));
$$ = $1;
}
- | ADDR
+ | ADDR
{
DBGL2 (("addr\n"));
$$ = ADDR;
fieldspec:
ftype range flags
{
- DBG (("line %d: field type=%d sbit=%d ebit=%d, flags=0x%x\n",
+ 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);
}
DBGL2 (("flags=%d\n", $2));
$$ = $2;
}
- |
+ |
{
$$ = 0;
}
ebit = 0;
}
;
-
+
pnum:
PNUM
{
ID
{
DBGL2 (("name=%s\n",$1));
- $$ = $1;
+ $$ = $1;
}
;
%%
static int
-yyerror (msg)
- const char *msg;
+yyerror (const char *msg)
{
printf ("line %d: %s\n", insntbl_line, msg);
return 0;
projects / deliverable / binutils-gdb.git / blobdiff