| 1 | /* Assembler interface for targets using CGEN. -*- C -*-
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| 2 | CGEN: Cpu tools GENerator
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| 3 |
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| 4 | THIS FILE IS MACHINE GENERATED WITH CGEN.
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| 5 | - the resultant file is machine generated, cgen-asm.in isn't
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| 6 |
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| 7 | Copyright 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
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| 8 |
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| 9 | This file is part of the GNU Binutils and GDB, the GNU debugger.
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| 10 |
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| 11 | This program is free software; you can redistribute it and/or modify
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| 12 | it under the terms of the GNU General Public License as published by
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| 13 | the Free Software Foundation; either version 2, or (at your option)
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| 14 | any later version.
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| 15 |
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| 16 | This program is distributed in the hope that it will be useful,
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| 17 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | GNU General Public License for more details.
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| 20 |
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| 21 | You should have received a copy of the GNU General Public License
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| 22 | along with this program; if not, write to the Free Software Foundation, Inc.,
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| 23 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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| 24 |
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| 25 | /* ??? Eventually more and more of this stuff can go to cpu-independent files.
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| 26 | Keep that in mind. */
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| 27 |
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| 28 | #include "sysdep.h"
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| 29 | #include <ctype.h>
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| 30 | #include <stdio.h>
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| 31 | #include "ansidecl.h"
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| 32 | #include "bfd.h"
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| 33 | #include "symcat.h"
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| 34 | #include "@prefix@-desc.h"
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| 35 | #include "@prefix@-opc.h"
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| 36 | #include "opintl.h"
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| 37 |
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| 38 | #undef min
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| 39 | #define min(a,b) ((a) < (b) ? (a) : (b))
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| 40 | #undef max
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| 41 | #define max(a,b) ((a) > (b) ? (a) : (b))
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| 42 |
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| 43 | static const char * parse_insn_normal
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| 44 | PARAMS ((CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *));
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| 45 | |
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| 46 |
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| 47 | /* -- assembler routines inserted here */
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| 48 | |
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| 49 |
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| 50 | /* Default insn parser.
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| 51 |
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| 52 | The syntax string is scanned and operands are parsed and stored in FIELDS.
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| 53 | Relocs are queued as we go via other callbacks.
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| 54 |
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| 55 | ??? Note that this is currently an all-or-nothing parser. If we fail to
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| 56 | parse the instruction, we return 0 and the caller will start over from
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| 57 | the beginning. Backtracking will be necessary in parsing subexpressions,
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| 58 | but that can be handled there. Not handling backtracking here may get
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| 59 | expensive in the case of the m68k. Deal with later.
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| 60 |
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| 61 | Returns NULL for success, an error message for failure.
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| 62 | */
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| 63 |
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| 64 | static const char *
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| 65 | parse_insn_normal (cd, insn, strp, fields)
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| 66 | CGEN_CPU_DESC cd;
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| 67 | const CGEN_INSN *insn;
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| 68 | const char **strp;
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| 69 | CGEN_FIELDS *fields;
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| 70 | {
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| 71 | /* ??? Runtime added insns not handled yet. */
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| 72 | const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
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| 73 | const char *str = *strp;
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| 74 | const char *errmsg;
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| 75 | const char *p;
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| 76 | const CGEN_SYNTAX_CHAR_TYPE * syn;
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| 77 | #ifdef CGEN_MNEMONIC_OPERANDS
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| 78 | /* FIXME: wip */
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| 79 | int past_opcode_p;
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| 80 | #endif
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| 81 |
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| 82 | /* For now we assume the mnemonic is first (there are no leading operands).
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| 83 | We can parse it without needing to set up operand parsing.
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| 84 | GAS's input scrubber will ensure mnemonics are lowercase, but we may
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| 85 | not be called from GAS. */
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| 86 | p = CGEN_INSN_MNEMONIC (insn);
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| 87 | while (*p && tolower (*p) == tolower (*str))
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| 88 | ++p, ++str;
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| 89 |
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| 90 | if (* p)
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| 91 | return _("unrecognized instruction");
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| 92 |
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| 93 | #ifndef CGEN_MNEMONIC_OPERANDS
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| 94 | if (* str && !isspace (* str))
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| 95 | return _("unrecognized instruction");
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| 96 | #endif
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| 97 |
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| 98 | CGEN_INIT_PARSE (cd);
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| 99 | cgen_init_parse_operand (cd);
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| 100 | #ifdef CGEN_MNEMONIC_OPERANDS
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| 101 | past_opcode_p = 0;
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| 102 | #endif
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| 103 |
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| 104 | /* We don't check for (*str != '\0') here because we want to parse
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| 105 | any trailing fake arguments in the syntax string. */
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| 106 | syn = CGEN_SYNTAX_STRING (syntax);
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| 107 |
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| 108 | /* Mnemonics come first for now, ensure valid string. */
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| 109 | if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
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| 110 | abort ();
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| 111 |
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| 112 | ++syn;
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| 113 |
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| 114 | while (* syn != 0)
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| 115 | {
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| 116 | /* Non operand chars must match exactly. */
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| 117 | if (CGEN_SYNTAX_CHAR_P (* syn))
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| 118 | {
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| 119 | /* FIXME: While we allow for non-GAS callers above, we assume the
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| 120 | first char after the mnemonic part is a space. */
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| 121 | /* FIXME: We also take inappropriate advantage of the fact that
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| 122 | GAS's input scrubber will remove extraneous blanks. */
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| 123 | if (tolower (*str) == tolower (CGEN_SYNTAX_CHAR (* syn)))
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| 124 | {
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| 125 | #ifdef CGEN_MNEMONIC_OPERANDS
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| 126 | if (CGEN_SYNTAX_CHAR(* syn) == ' ')
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| 127 | past_opcode_p = 1;
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| 128 | #endif
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| 129 | ++ syn;
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| 130 | ++ str;
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| 131 | }
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| 132 | else if (*str)
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| 133 | {
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| 134 | /* Syntax char didn't match. Can't be this insn. */
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| 135 | static char msg [80];
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| 136 | /* xgettext:c-format */
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| 137 | sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
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| 138 | CGEN_SYNTAX_CHAR(*syn), *str);
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| 139 | return msg;
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| 140 | }
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| 141 | else
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| 142 | {
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| 143 | /* Ran out of input. */
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| 144 | static char msg [80];
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| 145 | /* xgettext:c-format */
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| 146 | sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
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| 147 | CGEN_SYNTAX_CHAR(*syn));
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| 148 | return msg;
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| 149 | }
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| 150 | continue;
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| 151 | }
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| 152 |
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| 153 | /* We have an operand of some sort. */
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| 154 | errmsg = @arch@_cgen_parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
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| 155 | &str, fields);
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| 156 | if (errmsg)
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| 157 | return errmsg;
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| 158 |
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| 159 | /* Done with this operand, continue with next one. */
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| 160 | ++ syn;
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| 161 | }
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| 162 |
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| 163 | /* If we're at the end of the syntax string, we're done. */
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| 164 | if (* syn == 0)
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| 165 | {
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| 166 | /* FIXME: For the moment we assume a valid `str' can only contain
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| 167 | blanks now. IE: We needn't try again with a longer version of
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| 168 | the insn and it is assumed that longer versions of insns appear
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| 169 | before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */
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| 170 | while (isspace (* str))
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| 171 | ++ str;
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| 172 |
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| 173 | if (* str != '\0')
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| 174 | return _("junk at end of line"); /* FIXME: would like to include `str' */
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| 175 |
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| 176 | return NULL;
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| 177 | }
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| 178 |
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| 179 | /* We couldn't parse it. */
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| 180 | return _("unrecognized instruction");
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| 181 | }
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| 182 | |
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| 183 |
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| 184 | /* Main entry point.
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| 185 | This routine is called for each instruction to be assembled.
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| 186 | STR points to the insn to be assembled.
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| 187 | We assume all necessary tables have been initialized.
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| 188 | The assembled instruction, less any fixups, is stored in BUF.
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| 189 | Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
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| 190 | still needs to be converted to target byte order, otherwise BUF is an array
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| 191 | of bytes in target byte order.
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| 192 | The result is a pointer to the insn's entry in the opcode table,
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| 193 | or NULL if an error occured (an error message will have already been
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| 194 | printed).
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| 195 |
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| 196 | Note that when processing (non-alias) macro-insns,
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| 197 | this function recurses.
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| 198 |
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| 199 | ??? It's possible to make this cpu-independent.
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| 200 | One would have to deal with a few minor things.
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| 201 | At this point in time doing so would be more of a curiosity than useful
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| 202 | [for example this file isn't _that_ big], but keeping the possibility in
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| 203 | mind helps keep the design clean. */
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| 204 |
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| 205 | const CGEN_INSN *
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| 206 | @arch@_cgen_assemble_insn (cd, str, fields, buf, errmsg)
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| 207 | CGEN_CPU_DESC cd;
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| 208 | const char *str;
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| 209 | CGEN_FIELDS *fields;
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| 210 | CGEN_INSN_BYTES_PTR buf;
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| 211 | char **errmsg;
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| 212 | {
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| 213 | const char *start;
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| 214 | CGEN_INSN_LIST *ilist;
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| 215 | const char *parse_errmsg = NULL;
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| 216 | const char *insert_errmsg = NULL;
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| 217 |
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| 218 | /* Skip leading white space. */
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| 219 | while (isspace (* str))
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| 220 | ++ str;
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| 221 |
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| 222 | /* The instructions are stored in hashed lists.
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| 223 | Get the first in the list. */
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| 224 | ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
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| 225 |
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| 226 | /* Keep looking until we find a match. */
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| 227 |
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| 228 | start = str;
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| 229 | for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
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| 230 | {
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| 231 | const CGEN_INSN *insn = ilist->insn;
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| 232 |
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| 233 | #ifdef CGEN_VALIDATE_INSN_SUPPORTED
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| 234 | /* not usually needed as unsupported opcodes shouldn't be in the hash lists */
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| 235 | /* Is this insn supported by the selected cpu? */
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| 236 | if (! @arch@_cgen_insn_supported (cd, insn))
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| 237 | continue;
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| 238 | #endif
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| 239 |
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| 240 | /* If the RELAX attribute is set, this is an insn that shouldn't be
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| 241 | chosen immediately. Instead, it is used during assembler/linker
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| 242 | relaxation if possible. */
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| 243 | if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX) != 0)
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| 244 | continue;
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| 245 |
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| 246 | str = start;
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| 247 |
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| 248 | /* Allow parse/insert handlers to obtain length of insn. */
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| 249 | CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
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| 250 |
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| 251 | parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
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| 252 | if (parse_errmsg != NULL)
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| 253 | continue;
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| 254 |
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| 255 | /* ??? 0 is passed for `pc' */
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| 256 | insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
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| 257 | (bfd_vma) 0);
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| 258 | if (insert_errmsg != NULL)
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| 259 | continue;
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| 260 |
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| 261 | /* It is up to the caller to actually output the insn and any
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| 262 | queued relocs. */
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| 263 | return insn;
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| 264 | }
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| 265 |
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| 266 | {
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| 267 | static char errbuf[150];
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| 268 | const char *tmp_errmsg;
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| 269 |
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| 270 | #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
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| 271 | /* If requesting verbose error messages, use insert_errmsg.
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| 272 | Failing that, use parse_errmsg */
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| 273 | tmp_errmsg = (insert_errmsg ? insert_errmsg :
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| 274 | parse_errmsg ? parse_errmsg :
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| 275 | _("unrecognized instruction"));
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| 276 |
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| 277 | if (strlen (start) > 50)
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| 278 | /* xgettext:c-format */
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| 279 | sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
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| 280 | else
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| 281 | /* xgettext:c-format */
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| 282 | sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
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| 283 | #else
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| 284 | if (strlen (start) > 50)
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| 285 | /* xgettext:c-format */
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| 286 | sprintf (errbuf, _("bad instruction `%.50s...'"), start);
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| 287 | else
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| 288 | /* xgettext:c-format */
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| 289 | sprintf (errbuf, _("bad instruction `%.50s'"), start);
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| 290 | #endif
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| 291 |
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| 292 | *errmsg = errbuf;
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| 293 | return NULL;
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| 294 | }
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| 295 | }
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| 296 | |
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| 297 |
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| 298 | #if 0 /* This calls back to GAS which we can't do without care. */
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| 299 |
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| 300 | /* Record each member of OPVALS in the assembler's symbol table.
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| 301 | This lets GAS parse registers for us.
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| 302 | ??? Interesting idea but not currently used. */
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| 303 |
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| 304 | /* Record each member of OPVALS in the assembler's symbol table.
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| 305 | FIXME: Not currently used. */
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| 306 |
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| 307 | void
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| 308 | @arch@_cgen_asm_hash_keywords (cd, opvals)
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| 309 | CGEN_CPU_DESC cd;
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| 310 | CGEN_KEYWORD *opvals;
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| 311 | {
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| 312 | CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
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| 313 | const CGEN_KEYWORD_ENTRY * ke;
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| 314 |
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| 315 | while ((ke = cgen_keyword_search_next (& search)) != NULL)
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| 316 | {
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| 317 | #if 0 /* Unnecessary, should be done in the search routine. */
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| 318 | if (! @arch@_cgen_opval_supported (ke))
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| 319 | continue;
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| 320 | #endif
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| 321 | cgen_asm_record_register (cd, ke->name, ke->value);
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| 322 | }
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| 323 | }
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| 324 |
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| 325 | #endif /* 0 */
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