X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=opcodes%2Fcgen-dis.c;h=2d0f701c962b8e315f583a78a6932cc694abfc2b;hb=74f5402d08b857d60499b27851c204954ce6c42c;hp=9ed8a0a9973110a08fa1ca5f1067b710041ef25f;hpb=21b4ac17687ab852b5159de7bd120aa2b7713567;p=deliverable%2Fbinutils-gdb.git diff --git a/opcodes/cgen-dis.c b/opcodes/cgen-dis.c index 9ed8a0a997..2d0f701c96 100644 --- a/opcodes/cgen-dis.c +++ b/opcodes/cgen-dis.c @@ -1,168 +1,240 @@ /* CGEN generic disassembler support code. + Copyright (C) 1996-2016 Free Software Foundation, Inc. -Copyright (C) 1996, 1997 Free Software Foundation, Inc. + This file is part of libopcodes. -This file is part of the GNU Binutils and GDB, the GNU debugger. + 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. -This program 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. + 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. -This program 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. */ -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., -59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#include "config.h" +#include "sysdep.h" #include -#ifdef HAVE_STRING_H -#include -#endif -#ifdef HAVE_STRINGS_H -#include -#endif #include "ansidecl.h" #include "libiberty.h" #include "bfd.h" +#include "symcat.h" #include "opcode/cgen.h" -/* This is not published as part of the public interface so we don't - declare this in cgen.h. */ -extern CGEN_OPCODE_DATA *cgen_current_opcode_data; +static CGEN_INSN_LIST * hash_insn_array (CGEN_CPU_DESC, const CGEN_INSN *, int, int, CGEN_INSN_LIST **, CGEN_INSN_LIST *); +static CGEN_INSN_LIST * hash_insn_list (CGEN_CPU_DESC, const CGEN_INSN_LIST *, CGEN_INSN_LIST **, CGEN_INSN_LIST *); +static void build_dis_hash_table (CGEN_CPU_DESC); +static int count_decodable_bits (const CGEN_INSN *); +static void add_insn_to_hash_chain (CGEN_INSN_LIST *, + const CGEN_INSN *, + CGEN_INSN_LIST **, + unsigned int); + +/* Return the number of decodable bits in this insn. */ +static int +count_decodable_bits (const CGEN_INSN *insn) +{ + unsigned mask = CGEN_INSN_BASE_MASK (insn); + int bits = 0; + unsigned m; + + for (m = 1; m != 0; m <<= 1) + { + if (mask & m) + ++bits; + } + return bits; +} + +/* Add an instruction to the hash chain. */ +static void +add_insn_to_hash_chain (CGEN_INSN_LIST *hentbuf, + const CGEN_INSN *insn, + CGEN_INSN_LIST **htable, + unsigned int hash) +{ + CGEN_INSN_LIST *current_buf; + CGEN_INSN_LIST *previous_buf; + int insn_decodable_bits; + + /* Add insns sorted by the number of decodable bits, in decreasing order. + This ensures that any insn which is a special case of another will be + checked first. */ + insn_decodable_bits = count_decodable_bits (insn); + previous_buf = NULL; + for (current_buf = htable[hash]; current_buf != NULL; + current_buf = current_buf->next) + { + int current_decodable_bits = count_decodable_bits (current_buf->insn); + if (insn_decodable_bits >= current_decodable_bits) + break; + previous_buf = current_buf; + } + + /* Now insert the new insn. */ + hentbuf->insn = insn; + hentbuf->next = current_buf; + if (previous_buf == NULL) + htable[hash] = hentbuf; + else + previous_buf->next = hentbuf; +} + +/* Subroutine of build_dis_hash_table to add INSNS to the hash table. + + COUNT is the number of elements in INSNS. + ENTSIZE is sizeof (CGEN_IBASE) for the target. + ??? No longer used but leave in for now. + HTABLE points to the hash table. + HENTBUF is a pointer to sufficiently large buffer of hash entries. + The result is a pointer to the next entry to use. + + The table is scanned backwards as additions are made to the front of the + list and we want earlier ones to be prefered. */ + +static CGEN_INSN_LIST * +hash_insn_array (CGEN_CPU_DESC cd, + const CGEN_INSN * insns, + int count, + int entsize ATTRIBUTE_UNUSED, + CGEN_INSN_LIST ** htable, + CGEN_INSN_LIST * hentbuf) +{ + int big_p = CGEN_CPU_INSN_ENDIAN (cd) == CGEN_ENDIAN_BIG; + int i; + + for (i = count - 1; i >= 0; --i, ++hentbuf) + { + unsigned int hash; + char buf [4]; + unsigned long value; + const CGEN_INSN *insn = &insns[i]; + + if (! (* cd->dis_hash_p) (insn)) + continue; + + /* We don't know whether the target uses the buffer or the base insn + to hash on, so set both up. */ + + value = CGEN_INSN_BASE_VALUE (insn); + bfd_put_bits ((bfd_vma) value, + buf, + CGEN_INSN_MASK_BITSIZE (insn), + big_p); + hash = (* cd->dis_hash) (buf, value); + add_insn_to_hash_chain (hentbuf, insn, htable, hash); + } + + return hentbuf; +} -/* Disassembler instruction hash table. */ -static CGEN_INSN_LIST **dis_hash_table; +/* Subroutine of build_dis_hash_table to add INSNS to the hash table. + This function is identical to hash_insn_array except the insns are + in a list. */ -void -cgen_dis_init () +static CGEN_INSN_LIST * +hash_insn_list (CGEN_CPU_DESC cd, + const CGEN_INSN_LIST *insns, + CGEN_INSN_LIST **htable, + CGEN_INSN_LIST *hentbuf) { - if (dis_hash_table) + int big_p = CGEN_CPU_INSN_ENDIAN (cd) == CGEN_ENDIAN_BIG; + const CGEN_INSN_LIST *ilist; + + for (ilist = insns; ilist != NULL; ilist = ilist->next, ++ hentbuf) { - free (dis_hash_table); - dis_hash_table = NULL; + unsigned int hash; + char buf[4]; + unsigned long value; + + if (! (* cd->dis_hash_p) (ilist->insn)) + continue; + + /* We don't know whether the target uses the buffer or the base insn + to hash on, so set both up. */ + + value = CGEN_INSN_BASE_VALUE (ilist->insn); + bfd_put_bits((bfd_vma) value, + buf, + CGEN_INSN_MASK_BITSIZE (ilist->insn), + big_p); + hash = (* cd->dis_hash) (buf, value); + add_insn_to_hash_chain (hentbuf, ilist->insn, htable, hash); } + + return hentbuf; } /* Build the disassembler instruction hash table. */ static void -build_dis_hash_table () +build_dis_hash_table (CGEN_CPU_DESC cd) { - int i; - int big_p = cgen_current_endian == CGEN_ENDIAN_BIG; - unsigned int hash; - char buf[4]; - unsigned long value; - int count = cgen_insn_count (); - CGEN_OPCODE_DATA *data = cgen_current_opcode_data; - CGEN_INSN_TABLE *insn_table = data->insn_table; - unsigned int hash_size = insn_table->dis_hash_table_size; - const CGEN_INSN *insn; - CGEN_INSN_LIST *insn_lists,*new_insns; + int count = cgen_insn_count (cd) + cgen_macro_insn_count (cd); + CGEN_INSN_TABLE *insn_table = & cd->insn_table; + CGEN_INSN_TABLE *macro_insn_table = & cd->macro_insn_table; + unsigned int hash_size = cd->dis_hash_size; + CGEN_INSN_LIST *hash_entry_buf; + CGEN_INSN_LIST **dis_hash_table; + CGEN_INSN_LIST *dis_hash_table_entries; /* The space allocated for the hash table consists of two parts: the hash table and the hash lists. */ dis_hash_table = (CGEN_INSN_LIST **) - xmalloc (hash_size * sizeof (CGEN_INSN_LIST *) - + count * sizeof (CGEN_INSN_LIST)); - memset (dis_hash_table, 0, - hash_size * sizeof (CGEN_INSN_LIST *) - + count * sizeof (CGEN_INSN_LIST)); - insn_lists = (CGEN_INSN_LIST *) (dis_hash_table + hash_size); + xmalloc (hash_size * sizeof (CGEN_INSN_LIST *)); + memset (dis_hash_table, 0, hash_size * sizeof (CGEN_INSN_LIST *)); + dis_hash_table_entries = hash_entry_buf = (CGEN_INSN_LIST *) + xmalloc (count * sizeof (CGEN_INSN_LIST)); /* Add compiled in insns. - The table is scanned backwards as later additions are inserted in - front of earlier ones and we want earlier ones to be prefered. - We stop at the first one as it is a reserved entry. */ + Don't include the first one as it is a reserved entry. */ + /* ??? It was the end of all hash chains, and also the special + "invalid insn" marker. May be able to do it differently now. */ - for (insn = insn_table->init_entries + insn_table->num_init_entries - 1; - insn > insn_table->init_entries; - --insn, ++insn_lists) - { - /* We don't know whether the target uses the buffer or the base insn - to hash on, so set both up. */ - value = insn->syntax.value; - switch (CGEN_INSN_BITSIZE (insn)) - { - case 8: - buf[0] = value; - break; - case 16: - if (big_p) - bfd_putb16 ((bfd_vma) value, buf); - else - bfd_putl16 ((bfd_vma) value, buf); - break; - case 32: - if (big_p) - bfd_putb32 ((bfd_vma) value, buf); - else - bfd_putl32 ((bfd_vma) value, buf); - break; - default: - abort (); - } - hash = (*insn_table->dis_hash) (buf, value); - insn_lists->next = dis_hash_table[hash]; - insn_lists->insn = insn; - dis_hash_table[hash] = insn_lists; - } + hash_entry_buf = hash_insn_array (cd, + insn_table->init_entries + 1, + insn_table->num_init_entries - 1, + insn_table->entry_size, + dis_hash_table, hash_entry_buf); + + /* Add compiled in macro-insns. */ + + hash_entry_buf = hash_insn_array (cd, macro_insn_table->init_entries, + macro_insn_table->num_init_entries, + macro_insn_table->entry_size, + dis_hash_table, hash_entry_buf); /* Add runtime added insns. - ??? Currently later added insns will be prefered over earlier ones. - Not sure this is a bug or not. */ - for (new_insns = insn_table->new_entries; - new_insns != NULL; - new_insns = new_insns->next, ++insn_lists) - { - /* We don't know whether the target uses the buffer or the base insn - to hash on, so set both up. */ - value = new_insns->insn->syntax.value; - switch (CGEN_INSN_BITSIZE (new_insns->insn)) - { - case 8: - buf[0] = value; - break; - case 16: - if (big_p) - bfd_putb16 ((bfd_vma) value, buf); - else - bfd_putl16 ((bfd_vma) value, buf); - break; - case 32: - if (big_p) - bfd_putb32 ((bfd_vma) value, buf); - else - bfd_putl32 ((bfd_vma) value, buf); - break; - default: - abort (); - } - hash = (*insn_table->dis_hash) (buf, value); - insn_lists->next = dis_hash_table[hash]; - insn_lists->insn = new_insns->insn; - dis_hash_table[hash] = insn_lists; - } + Later added insns will be prefered over earlier ones. */ + + hash_entry_buf = hash_insn_list (cd, insn_table->new_entries, + dis_hash_table, hash_entry_buf); + + /* Add runtime added macro-insns. */ + + hash_insn_list (cd, macro_insn_table->new_entries, + dis_hash_table, hash_entry_buf); + + cd->dis_hash_table = dis_hash_table; + cd->dis_hash_table_entries = dis_hash_table_entries; } /* Return the first entry in the hash list for INSN. */ CGEN_INSN_LIST * -cgen_dis_lookup_insn (buf, value) - const char *buf; - unsigned long value; +cgen_dis_lookup_insn (CGEN_CPU_DESC cd, const char * buf, CGEN_INSN_INT value) { unsigned int hash; - if (dis_hash_table == NULL) - build_dis_hash_table (); + if (cd->dis_hash_table == NULL) + build_dis_hash_table (cd); + + hash = (* cd->dis_hash) (buf, value); - hash = (*cgen_current_opcode_data->insn_table->dis_hash) (buf, value); - return dis_hash_table[hash]; + return cd->dis_hash_table[hash]; }