| /* Assembler interface for targets using CGEN. -*- C -*- |
| CGEN: Cpu tools GENerator |
| |
| THIS FILE IS MACHINE GENERATED WITH CGEN. |
| - the resultant file is machine generated, cgen-asm.in isn't |
| |
| Copyright (C) 1996-2016 Free Software Foundation, Inc. |
| |
| This file is part of libopcodes. |
| |
| This library 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 3, or (at your option) |
| any later version. |
| |
| It 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., |
| 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
| |
| |
| /* ??? Eventually more and more of this stuff can go to cpu-independent files. |
| Keep that in mind. */ |
| |
| #include "sysdep.h" |
| #include <stdio.h> |
| #include "ansidecl.h" |
| #include "bfd.h" |
| #include "symcat.h" |
| #include "@prefix@-desc.h" |
| #include "@prefix@-opc.h" |
| #include "opintl.h" |
| #include "xregex.h" |
| #include "libiberty.h" |
| #include "safe-ctype.h" |
| |
| #undef min |
| #define min(a,b) ((a) < (b) ? (a) : (b)) |
| #undef max |
| #define max(a,b) ((a) > (b) ? (a) : (b)) |
| |
| static const char * parse_insn_normal |
| (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *); |
| |
| /* -- assembler routines inserted here. */ |
| |
| |
| /* Regex construction routine. |
| |
| This translates an opcode syntax string into a regex string, |
| by replacing any non-character syntax element (such as an |
| opcode) with the pattern '.*' |
| |
| It then compiles the regex and stores it in the opcode, for |
| later use by @arch@_cgen_assemble_insn |
| |
| Returns NULL for success, an error message for failure. */ |
| |
| char * |
| @arch@_cgen_build_insn_regex (CGEN_INSN *insn) |
| { |
| CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn); |
| const char *mnem = CGEN_INSN_MNEMONIC (insn); |
| char rxbuf[CGEN_MAX_RX_ELEMENTS]; |
| char *rx = rxbuf; |
| const CGEN_SYNTAX_CHAR_TYPE *syn; |
| int reg_err; |
| |
| syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc)); |
| |
| /* Mnemonics come first in the syntax string. */ |
| if (! CGEN_SYNTAX_MNEMONIC_P (* syn)) |
| return _("missing mnemonic in syntax string"); |
| ++syn; |
| |
| /* Generate a case sensitive regular expression that emulates case |
| insensitive matching in the "C" locale. We cannot generate a case |
| insensitive regular expression because in Turkish locales, 'i' and 'I' |
| are not equal modulo case conversion. */ |
| |
| /* Copy the literal mnemonic out of the insn. */ |
| for (; *mnem; mnem++) |
| { |
| char c = *mnem; |
| |
| if (ISALPHA (c)) |
| { |
| *rx++ = '['; |
| *rx++ = TOLOWER (c); |
| *rx++ = TOUPPER (c); |
| *rx++ = ']'; |
| } |
| else |
| *rx++ = c; |
| } |
| |
| /* Copy any remaining literals from the syntax string into the rx. */ |
| for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn) |
| { |
| if (CGEN_SYNTAX_CHAR_P (* syn)) |
| { |
| char c = CGEN_SYNTAX_CHAR (* syn); |
| |
| switch (c) |
| { |
| /* Escape any regex metacharacters in the syntax. */ |
| case '.': case '[': case '\\': |
| case '*': case '^': case '$': |
| |
| #ifdef CGEN_ESCAPE_EXTENDED_REGEX |
| case '?': case '{': case '}': |
| case '(': case ')': case '*': |
| case '|': case '+': case ']': |
| #endif |
| *rx++ = '\\'; |
| *rx++ = c; |
| break; |
| |
| default: |
| if (ISALPHA (c)) |
| { |
| *rx++ = '['; |
| *rx++ = TOLOWER (c); |
| *rx++ = TOUPPER (c); |
| *rx++ = ']'; |
| } |
| else |
| *rx++ = c; |
| break; |
| } |
| } |
| else |
| { |
| /* Replace non-syntax fields with globs. */ |
| *rx++ = '.'; |
| *rx++ = '*'; |
| } |
| } |
| |
| /* Trailing whitespace ok. */ |
| * rx++ = '['; |
| * rx++ = ' '; |
| * rx++ = '\t'; |
| * rx++ = ']'; |
| * rx++ = '*'; |
| |
| /* But anchor it after that. */ |
| * rx++ = '$'; |
| * rx = '\0'; |
| |
| CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t)); |
| reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB); |
| |
| if (reg_err == 0) |
| return NULL; |
| else |
| { |
| static char msg[80]; |
| |
| regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80); |
| regfree ((regex_t *) CGEN_INSN_RX (insn)); |
| free (CGEN_INSN_RX (insn)); |
| (CGEN_INSN_RX (insn)) = NULL; |
| return msg; |
| } |
| } |
| |
| |
| /* Default insn parser. |
| |
| The syntax string is scanned and operands are parsed and stored in FIELDS. |
| Relocs are queued as we go via other callbacks. |
| |
| ??? Note that this is currently an all-or-nothing parser. If we fail to |
| parse the instruction, we return 0 and the caller will start over from |
| the beginning. Backtracking will be necessary in parsing subexpressions, |
| but that can be handled there. Not handling backtracking here may get |
| expensive in the case of the m68k. Deal with later. |
| |
| Returns NULL for success, an error message for failure. */ |
| |
| static const char * |
| parse_insn_normal (CGEN_CPU_DESC cd, |
| const CGEN_INSN *insn, |
| const char **strp, |
| CGEN_FIELDS *fields) |
| { |
| /* ??? Runtime added insns not handled yet. */ |
| const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn); |
| const char *str = *strp; |
| const char *errmsg; |
| const char *p; |
| const CGEN_SYNTAX_CHAR_TYPE * syn; |
| #ifdef CGEN_MNEMONIC_OPERANDS |
| /* FIXME: wip */ |
| int past_opcode_p; |
| #endif |
| |
| /* For now we assume the mnemonic is first (there are no leading operands). |
| We can parse it without needing to set up operand parsing. |
| GAS's input scrubber will ensure mnemonics are lowercase, but we may |
| not be called from GAS. */ |
| p = CGEN_INSN_MNEMONIC (insn); |
| while (*p && TOLOWER (*p) == TOLOWER (*str)) |
| ++p, ++str; |
| |
| if (* p) |
| return _("unrecognized instruction"); |
| |
| #ifndef CGEN_MNEMONIC_OPERANDS |
| if (* str && ! ISSPACE (* str)) |
| return _("unrecognized instruction"); |
| #endif |
| |
| CGEN_INIT_PARSE (cd); |
| cgen_init_parse_operand (cd); |
| #ifdef CGEN_MNEMONIC_OPERANDS |
| past_opcode_p = 0; |
| #endif |
| |
| /* We don't check for (*str != '\0') here because we want to parse |
| any trailing fake arguments in the syntax string. */ |
| syn = CGEN_SYNTAX_STRING (syntax); |
| |
| /* Mnemonics come first for now, ensure valid string. */ |
| if (! CGEN_SYNTAX_MNEMONIC_P (* syn)) |
| abort (); |
| |
| ++syn; |
| |
| while (* syn != 0) |
| { |
| /* Non operand chars must match exactly. */ |
| if (CGEN_SYNTAX_CHAR_P (* syn)) |
| { |
| /* FIXME: While we allow for non-GAS callers above, we assume the |
| first char after the mnemonic part is a space. */ |
| /* FIXME: We also take inappropriate advantage of the fact that |
| GAS's input scrubber will remove extraneous blanks. */ |
| if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn))) |
| { |
| #ifdef CGEN_MNEMONIC_OPERANDS |
| if (CGEN_SYNTAX_CHAR(* syn) == ' ') |
| past_opcode_p = 1; |
| #endif |
| ++ syn; |
| ++ str; |
| } |
| else if (*str) |
| { |
| /* Syntax char didn't match. Can't be this insn. */ |
| static char msg [80]; |
| |
| /* xgettext:c-format */ |
| sprintf (msg, _("syntax error (expected char `%c', found `%c')"), |
| CGEN_SYNTAX_CHAR(*syn), *str); |
| return msg; |
| } |
| else |
| { |
| /* Ran out of input. */ |
| static char msg [80]; |
| |
| /* xgettext:c-format */ |
| sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"), |
| CGEN_SYNTAX_CHAR(*syn)); |
| return msg; |
| } |
| continue; |
| } |
| |
| #ifdef CGEN_MNEMONIC_OPERANDS |
| (void) past_opcode_p; |
| #endif |
| /* We have an operand of some sort. */ |
| errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), &str, fields); |
| if (errmsg) |
| return errmsg; |
| |
| /* Done with this operand, continue with next one. */ |
| ++ syn; |
| } |
| |
| /* If we're at the end of the syntax string, we're done. */ |
| if (* syn == 0) |
| { |
| /* FIXME: For the moment we assume a valid `str' can only contain |
| blanks now. IE: We needn't try again with a longer version of |
| the insn and it is assumed that longer versions of insns appear |
| before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3). */ |
| while (ISSPACE (* str)) |
| ++ str; |
| |
| if (* str != '\0') |
| return _("junk at end of line"); /* FIXME: would like to include `str' */ |
| |
| return NULL; |
| } |
| |
| /* We couldn't parse it. */ |
| return _("unrecognized instruction"); |
| } |
| |
| /* Main entry point. |
| This routine is called for each instruction to be assembled. |
| STR points to the insn to be assembled. |
| We assume all necessary tables have been initialized. |
| The assembled instruction, less any fixups, is stored in BUF. |
| Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value |
| still needs to be converted to target byte order, otherwise BUF is an array |
| of bytes in target byte order. |
| The result is a pointer to the insn's entry in the opcode table, |
| or NULL if an error occured (an error message will have already been |
| printed). |
| |
| Note that when processing (non-alias) macro-insns, |
| this function recurses. |
| |
| ??? It's possible to make this cpu-independent. |
| One would have to deal with a few minor things. |
| At this point in time doing so would be more of a curiosity than useful |
| [for example this file isn't _that_ big], but keeping the possibility in |
| mind helps keep the design clean. */ |
| |
| const CGEN_INSN * |
| @arch@_cgen_assemble_insn (CGEN_CPU_DESC cd, |
| const char *str, |
| CGEN_FIELDS *fields, |
| CGEN_INSN_BYTES_PTR buf, |
| char **errmsg) |
| { |
| const char *start; |
| CGEN_INSN_LIST *ilist; |
| const char *parse_errmsg = NULL; |
| const char *insert_errmsg = NULL; |
| int recognized_mnemonic = 0; |
| |
| /* Skip leading white space. */ |
| while (ISSPACE (* str)) |
| ++ str; |
| |
| /* The instructions are stored in hashed lists. |
| Get the first in the list. */ |
| ilist = CGEN_ASM_LOOKUP_INSN (cd, str); |
| |
| /* Keep looking until we find a match. */ |
| start = str; |
| for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist)) |
| { |
| const CGEN_INSN *insn = ilist->insn; |
| recognized_mnemonic = 1; |
| |
| #ifdef CGEN_VALIDATE_INSN_SUPPORTED |
| /* Not usually needed as unsupported opcodes |
| shouldn't be in the hash lists. */ |
| /* Is this insn supported by the selected cpu? */ |
| if (! @arch@_cgen_insn_supported (cd, insn)) |
| continue; |
| #endif |
| /* If the RELAXED attribute is set, this is an insn that shouldn't be |
| chosen immediately. Instead, it is used during assembler/linker |
| relaxation if possible. */ |
| if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0) |
| continue; |
| |
| str = start; |
| |
| /* Skip this insn if str doesn't look right lexically. */ |
| if (CGEN_INSN_RX (insn) != NULL && |
| regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH) |
| continue; |
| |
| /* Allow parse/insert handlers to obtain length of insn. */ |
| CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn); |
| |
| parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields); |
| if (parse_errmsg != NULL) |
| continue; |
| |
| /* ??? 0 is passed for `pc'. */ |
| insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf, |
| (bfd_vma) 0); |
| if (insert_errmsg != NULL) |
| continue; |
| |
| /* It is up to the caller to actually output the insn and any |
| queued relocs. */ |
| return insn; |
| } |
| |
| { |
| static char errbuf[150]; |
| const char *tmp_errmsg; |
| #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS |
| #define be_verbose 1 |
| #else |
| #define be_verbose 0 |
| #endif |
| |
| if (be_verbose) |
| { |
| /* If requesting verbose error messages, use insert_errmsg. |
| Failing that, use parse_errmsg. */ |
| tmp_errmsg = (insert_errmsg ? insert_errmsg : |
| parse_errmsg ? parse_errmsg : |
| recognized_mnemonic ? |
| _("unrecognized form of instruction") : |
| _("unrecognized instruction")); |
| |
| if (strlen (start) > 50) |
| /* xgettext:c-format */ |
| sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start); |
| else |
| /* xgettext:c-format */ |
| sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start); |
| } |
| else |
| { |
| if (strlen (start) > 50) |
| /* xgettext:c-format */ |
| sprintf (errbuf, _("bad instruction `%.50s...'"), start); |
| else |
| /* xgettext:c-format */ |
| sprintf (errbuf, _("bad instruction `%.50s'"), start); |
| } |
| |
| *errmsg = errbuf; |
| return NULL; |
| } |
| } |