/* 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) 1996-2017 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; } }