| /* CGEN generic disassembler support code. |
| |
| Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc. |
| |
| This file is part of the GNU Binutils and GDB, the GNU debugger. |
| |
| 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. |
| |
| 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., |
| 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| |
| #include "sysdep.h" |
| #include <stdio.h> |
| #include "ansidecl.h" |
| #include "libiberty.h" |
| #include "bfd.h" |
| #include "symcat.h" |
| #include "opcode/cgen.h" |
| |
| /* 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 (cd, insns, count, entsize, htable, hentbuf) |
| CGEN_CPU_DESC cd; |
| const CGEN_INSN * insns; |
| int count; |
| int entsize; |
| CGEN_INSN_LIST ** htable; |
| CGEN_INSN_LIST * hentbuf; |
| { |
| int big_p = CGEN_CPU_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); |
| switch (CGEN_INSN_MASK_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 = (* cd->dis_hash) (buf, value); |
| hentbuf->next = htable[hash]; |
| hentbuf->insn = insn; |
| htable[hash] = hentbuf; |
| } |
| |
| return hentbuf; |
| } |
| |
| /* 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. */ |
| |
| static CGEN_INSN_LIST * |
| hash_insn_list (cd, insns, htable, hentbuf) |
| CGEN_CPU_DESC cd; |
| const CGEN_INSN_LIST *insns; |
| CGEN_INSN_LIST **htable; |
| CGEN_INSN_LIST *hentbuf; |
| { |
| int big_p = CGEN_CPU_ENDIAN (cd) == CGEN_ENDIAN_BIG; |
| const CGEN_INSN_LIST *ilist; |
| |
| for (ilist = insns; ilist != NULL; ilist = ilist->next, ++ hentbuf) |
| { |
| 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); |
| switch (CGEN_INSN_MASK_BITSIZE (ilist->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 = (* cd->dis_hash) (buf, value); |
| hentbuf->next = htable [hash]; |
| hentbuf->insn = ilist->insn; |
| htable [hash] = hentbuf; |
| } |
| |
| return hentbuf; |
| } |
| |
| /* Build the disassembler instruction hash table. */ |
| |
| static void |
| build_dis_hash_table (cd) |
| CGEN_CPU_DESC cd; |
| { |
| 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 *)); |
| 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. |
| 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. */ |
| |
| 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. |
| 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 (cd, buf, value) |
| CGEN_CPU_DESC cd; |
| const char * buf; |
| CGEN_INSN_INT value; |
| { |
| unsigned int hash; |
| |
| if (cd->dis_hash_table == NULL) |
| build_dis_hash_table (cd); |
| |
| hash = (* cd->dis_hash) (buf, value); |
| |
| return cd->dis_hash_table[hash]; |
| } |