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/* ia64-opc.c -- Functions to access the compacted opcode table
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Copyright (C) 1999-2022 Free Software Foundation, Inc.
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Written by Bob Manson of Cygnus Solutions, <manson@cygnus.com>
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This file is part of the GNU opcodes library.
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This library is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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It is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with this file; see the file COPYING. If not, write to the
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Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "sysdep.h"
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#include "libiberty.h"
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#include "ia64-asmtab.h"
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#include "ia64-asmtab.c"
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static void get_opc_prefix (const char **, char *);
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static short int find_string_ent (const char *);
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static short int find_main_ent (short int);
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static short int find_completer (short int, short int, const char *);
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static ia64_insn apply_completer (ia64_insn, int);
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static int extract_op_bits (int, int, int);
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static int extract_op (int, int *, unsigned int *);
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static int opcode_verify (ia64_insn, int, enum ia64_insn_type);
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static int locate_opcode_ent (ia64_insn, enum ia64_insn_type);
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static struct ia64_opcode *make_ia64_opcode
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(ia64_insn, const char *, int, int);
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static struct ia64_opcode *ia64_find_matching_opcode
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(const char *, short int);
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const struct ia64_templ_desc ia64_templ_desc[16] =
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{
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{ 0, { IA64_UNIT_M, IA64_UNIT_I, IA64_UNIT_I }, "MII" }, /* 0 */
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{ 2, { IA64_UNIT_M, IA64_UNIT_I, IA64_UNIT_I }, "MII" },
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{ 0, { IA64_UNIT_M, IA64_UNIT_L, IA64_UNIT_X }, "MLX" },
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{ 0, { 0, }, "-3-" },
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{ 0, { IA64_UNIT_M, IA64_UNIT_M, IA64_UNIT_I }, "MMI" }, /* 4 */
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{ 1, { IA64_UNIT_M, IA64_UNIT_M, IA64_UNIT_I }, "MMI" },
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{ 0, { IA64_UNIT_M, IA64_UNIT_F, IA64_UNIT_I }, "MFI" },
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{ 0, { IA64_UNIT_M, IA64_UNIT_M, IA64_UNIT_F }, "MMF" },
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{ 0, { IA64_UNIT_M, IA64_UNIT_I, IA64_UNIT_B }, "MIB" }, /* 8 */
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{ 0, { IA64_UNIT_M, IA64_UNIT_B, IA64_UNIT_B }, "MBB" },
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{ 0, { 0, }, "-a-" },
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{ 0, { IA64_UNIT_B, IA64_UNIT_B, IA64_UNIT_B }, "BBB" },
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{ 0, { IA64_UNIT_M, IA64_UNIT_M, IA64_UNIT_B }, "MMB" }, /* c */
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{ 0, { 0, }, "-d-" },
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{ 0, { IA64_UNIT_M, IA64_UNIT_F, IA64_UNIT_B }, "MFB" },
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{ 0, { 0, }, "-f-" },
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};
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/* Copy the prefix contained in *PTR (up to a '.' or a NUL) to DEST.
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PTR will be adjusted to point to the start of the next portion
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of the opcode, or at the NUL character. */
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static void
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get_opc_prefix (const char **ptr, char *dest)
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{
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char *c = strchr (*ptr, '.');
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if (c != NULL)
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{
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memcpy (dest, *ptr, c - *ptr);
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dest[c - *ptr] = '\0';
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*ptr = c + 1;
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}
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else
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{
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int l = strlen (*ptr);
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memcpy (dest, *ptr, l);
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dest[l] = '\0';
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*ptr += l;
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}
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}
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/* Find the index of the entry in the string table corresponding to
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STR; return -1 if one does not exist. */
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static short
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find_string_ent (const char *str)
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{
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short start = 0;
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short end = sizeof (ia64_strings) / sizeof (const char *);
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short i = (start + end) / 2;
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if (strcmp (str, ia64_strings[end - 1]) > 0)
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{
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return -1;
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}
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while (start <= end)
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{
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int c = strcmp (str, ia64_strings[i]);
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if (c < 0)
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{
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end = i - 1;
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}
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else if (c == 0)
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{
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return i;
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}
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else
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{
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start = i + 1;
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}
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i = (start + end) / 2;
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}
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return -1;
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}
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/* Find the opcode in the main opcode table whose name is STRINGINDEX, or
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return -1 if one does not exist. */
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static short
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find_main_ent (short nameindex)
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{
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short start = 0;
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short end = ARRAY_SIZE (main_table);
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short i = (start + end) / 2;
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if (nameindex < main_table[0].name_index
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|| nameindex > main_table[end - 1].name_index)
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{
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return -1;
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}
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while (start <= end)
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{
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if (nameindex < main_table[i].name_index)
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{
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end = i - 1;
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}
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else if (nameindex == main_table[i].name_index)
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{
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while (i > 0 && main_table[i - 1].name_index == nameindex)
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{
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i--;
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}
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return i;
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}
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else
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{
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start = i + 1;
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}
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i = (start + end) / 2;
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}
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return -1;
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}
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/* Find the index of the entry in the completer table that is part of
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MAIN_ENT (starting from PREV_COMPLETER) that matches NAME, or
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return -1 if one does not exist. */
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static short
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find_completer (short main_ent, short prev_completer, const char *name)
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{
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short name_index = find_string_ent (name);
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if (name_index < 0)
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{
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return -1;
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}
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if (prev_completer == -1)
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{
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prev_completer = main_table[main_ent].completers;
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}
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else
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{
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prev_completer = completer_table[prev_completer].subentries;
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}
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while (prev_completer != -1)
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{
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if (completer_table[prev_completer].name_index == name_index)
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{
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return prev_completer;
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}
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prev_completer = completer_table[prev_completer].alternative;
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}
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return -1;
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}
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/* Apply the completer referred to by COMPLETER_INDEX to OPCODE, and
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return the result. */
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static ia64_insn
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apply_completer (ia64_insn opcode, int completer_index)
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{
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ia64_insn mask = completer_table[completer_index].mask;
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ia64_insn bits = completer_table[completer_index].bits;
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int shiftamt = (completer_table[completer_index].offset & 63);
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mask = mask << shiftamt;
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bits = bits << shiftamt;
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opcode = (opcode & ~mask) | bits;
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return opcode;
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}
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/* Extract BITS number of bits starting from OP_POINTER + BITOFFSET in
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the dis_table array, and return its value. (BITOFFSET is numbered
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starting from MSB to LSB, so a BITOFFSET of 0 indicates the MSB of the
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first byte in OP_POINTER.) */
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static int
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extract_op_bits (int op_pointer, int bitoffset, int bits)
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{
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int res = 0;
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op_pointer += (bitoffset / 8);
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if (bitoffset % 8)
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{
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unsigned int op = dis_table[op_pointer++];
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int numb = 8 - (bitoffset % 8);
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int mask = (1 << numb) - 1;
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int bata = (bits < numb) ? bits : numb;
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int delta = numb - bata;
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res = (res << bata) | ((op & mask) >> delta);
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bitoffset += bata;
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bits -= bata;
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}
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while (bits >= 8)
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{
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res = (res << 8) | (dis_table[op_pointer++] & 255);
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bits -= 8;
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}
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if (bits > 0)
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{
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unsigned int op = (dis_table[op_pointer++] & 255);
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res = (res << bits) | (op >> (8 - bits));
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}
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return res;
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}
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/* Examine the state machine entry at OP_POINTER in the dis_table
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array, and extract its values into OPVAL and OP. The length of the
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state entry in bits is returned. */
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static int
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extract_op (int op_pointer, int *opval, unsigned int *op)
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{
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int oplen = 5;
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*op = dis_table[op_pointer];
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if ((*op) & 0x40)
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{
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opval[0] = extract_op_bits (op_pointer, oplen, 5);
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oplen += 5;
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}
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switch ((*op) & 0x30)
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{
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case 0x10:
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{
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opval[1] = extract_op_bits (op_pointer, oplen, 8);
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oplen += 8;
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opval[1] += op_pointer;
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break;
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}
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case 0x20:
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{
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opval[1] = extract_op_bits (op_pointer, oplen, 16);
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if (! (opval[1] & 32768))
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{
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opval[1] += op_pointer;
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}
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oplen += 16;
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break;
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}
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case 0x30:
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{
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oplen--;
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opval[2] = extract_op_bits (op_pointer, oplen, 12);
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oplen += 12;
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opval[2] |= 32768;
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break;
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}
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}
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if (((*op) & 0x08) && (((*op) & 0x30) != 0x30))
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{
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opval[2] = extract_op_bits (op_pointer, oplen, 16);
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oplen += 16;
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if (! (opval[2] & 32768))
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{
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opval[2] += op_pointer;
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}
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}
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return oplen;
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}
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/* Returns a non-zero value if the opcode in the main_table list at
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PLACE matches OPCODE and is of type TYPE. */
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static int
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opcode_verify (ia64_insn opcode, int place, enum ia64_insn_type type)
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{
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if (main_table[place].opcode_type != type)
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{
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return 0;
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}
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if (main_table[place].flags
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& (IA64_OPCODE_F2_EQ_F3 | IA64_OPCODE_LEN_EQ_64MCNT))
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{
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const struct ia64_operand *o1, *o2;
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ia64_insn f2, f3;
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if (main_table[place].flags & IA64_OPCODE_F2_EQ_F3)
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{
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o1 = elf64_ia64_operands + IA64_OPND_F2;
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o2 = elf64_ia64_operands + IA64_OPND_F3;
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(*o1->extract) (o1, opcode, &f2);
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(*o2->extract) (o2, opcode, &f3);
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if (f2 != f3)
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return 0;
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}
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else
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{
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ia64_insn len, count;
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/* length must equal 64-count: */
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o1 = elf64_ia64_operands + IA64_OPND_LEN6;
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o2 = elf64_ia64_operands + main_table[place].operands[2];
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(*o1->extract) (o1, opcode, &len);
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(*o2->extract) (o2, opcode, &count);
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if (len != 64 - count)
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return 0;
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}
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}
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return 1;
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}
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/* Find an instruction entry in the ia64_dis_names array that matches
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opcode OPCODE and is of type TYPE. Returns either a positive index
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into the array, or a negative value if an entry for OPCODE could
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not be found. Checks all matches and returns the one with the highest
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priority. */
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static int
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locate_opcode_ent (ia64_insn opcode, enum ia64_insn_type type)
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{
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int currtest[41];
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int bitpos[41];
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int op_ptr[41];
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int currstatenum = 0;
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short found_disent = -1;
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short found_priority = -1;
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currtest[currstatenum] = 0;
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op_ptr[currstatenum] = 0;
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bitpos[currstatenum] = 40;
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while (1)
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{
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int op_pointer = op_ptr[currstatenum];
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unsigned int op;
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int currbitnum = bitpos[currstatenum];
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int oplen;
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int opval[3] = {0};
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int next_op;
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int currbit;
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oplen = extract_op (op_pointer, opval, &op);
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bitpos[currstatenum] = currbitnum;
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/* Skip opval[0] bits in the instruction. */
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if (op & 0x40)
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{
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currbitnum -= opval[0];
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}
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if (currbitnum < 0)
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currbitnum = 0;
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/* The value of the current bit being tested. */
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currbit = opcode & (((ia64_insn) 1) << currbitnum) ? 1 : 0;
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next_op = -1;
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/* We always perform the tests specified in the current state in
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a particular order, falling through to the next test if the
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previous one failed. */
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switch (currtest[currstatenum])
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{
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case 0:
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currtest[currstatenum]++;
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if (currbit == 0 && (op & 0x80))
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{
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/* Check for a zero bit. If this test solely checks for
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a zero bit, we can check for up to 8 consecutive zero
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bits (the number to check is specified by the lower 3
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bits in the state code.)
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If the state instruction matches, we go to the very
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next state instruction; otherwise, try the next test. */
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if ((op & 0xf8) == 0x80)
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{
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int count = op & 0x7;
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int x;
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for (x = 0; x <= count; x++)
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{
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int i =
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opcode & (((ia64_insn) 1) << (currbitnum - x)) ? 1 : 0;
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if (i)
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{
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break;
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}
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}
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if (x > count)
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{
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next_op = op_pointer + ((oplen + 7) / 8);
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currbitnum -= count;
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break;
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}
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}
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else if (! currbit)
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{
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next_op = op_pointer + ((oplen + 7) / 8);
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break;
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}
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}
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/* FALLTHROUGH */
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case 1:
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/* If the bit in the instruction is one, go to the state
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instruction specified by opval[1]. */
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currtest[currstatenum]++;
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|
|
if (currbit && (op & 0x30) != 0 && ((op & 0x30) != 0x30))
|
|
|
{
|
|
|
next_op = opval[1];
|
|
|
break;
|
|
|
}
|
|
|
/* FALLTHROUGH */
|
|
|
case 2:
|
|
|
/* Don't care. Skip the current bit and go to the state
|
|
|
instruction specified by opval[2].
|
|
|
|
|
|
An encoding of 0x30 is special; this means that a 12-bit
|
|
|
offset into the ia64_dis_names[] array is specified. */
|
|
|
currtest[currstatenum]++;
|
|
|
if ((op & 0x08) || ((op & 0x30) == 0x30))
|
|
|
{
|
|
|
next_op = opval[2];
|
|
|
break;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/* If bit 15 is set in the address of the next state, an offset
|
|
|
in the ia64_dis_names array was specified instead. We then
|
|
|
check to see if an entry in the list of opcodes matches the
|
|
|
opcode we were given; if so, we have succeeded. */
|
|
|
|
|
|
if ((next_op >= 0) && (next_op & 32768))
|
|
|
{
|
|
|
short disent = next_op & 32767;
|
|
|
short priority = -1;
|
|
|
|
|
|
if (next_op > 65535)
|
|
|
{
|
|
|
return -1;
|
|
|
}
|
|
|
|
|
|
/* Run through the list of opcodes to check, trying to find
|
|
|
one that matches. */
|
|
|
while (disent >= 0)
|
|
|
{
|
|
|
int place = ia64_dis_names[disent].insn_index;
|
|
|
|
|
|
priority = ia64_dis_names[disent].priority;
|
|
|
|
|
|
if (opcode_verify (opcode, place, type)
|
|
|
&& priority > found_priority)
|
|
|
{
|
|
|
break;
|
|
|
}
|
|
|
if (ia64_dis_names[disent].next_flag)
|
|
|
{
|
|
|
disent++;
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
disent = -1;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
if (disent >= 0)
|
|
|
{
|
|
|
found_disent = disent;
|
|
|
found_priority = priority;
|
|
|
}
|
|
|
/* Try the next test in this state, regardless of whether a match
|
|
|
was found. */
|
|
|
next_op = -2;
|
|
|
}
|
|
|
|
|
|
/* next_op == -1 is "back up to the previous state".
|
|
|
next_op == -2 is "stay in this state and try the next test".
|
|
|
Otherwise, transition to the state indicated by next_op. */
|
|
|
|
|
|
if (next_op == -1)
|
|
|
{
|
|
|
currstatenum--;
|
|
|
if (currstatenum < 0)
|
|
|
{
|
|
|
return found_disent;
|
|
|
}
|
|
|
}
|
|
|
else if (next_op >= 0)
|
|
|
{
|
|
|
currstatenum++;
|
|
|
bitpos[currstatenum] = currbitnum - 1;
|
|
|
op_ptr[currstatenum] = next_op;
|
|
|
currtest[currstatenum] = 0;
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/* Construct an ia64_opcode entry based on OPCODE, NAME and PLACE. */
|
|
|
|
|
|
static struct ia64_opcode *
|
|
|
make_ia64_opcode (ia64_insn opcode, const char *name, int place, int depind)
|
|
|
{
|
|
|
struct ia64_opcode *res =
|
|
|
(struct ia64_opcode *) xmalloc (sizeof (struct ia64_opcode));
|
|
|
res->name = xstrdup (name);
|
|
|
res->type = main_table[place].opcode_type;
|
|
|
res->num_outputs = main_table[place].num_outputs;
|
|
|
res->opcode = opcode;
|
|
|
res->mask = main_table[place].mask;
|
|
|
res->operands[0] = main_table[place].operands[0];
|
|
|
res->operands[1] = main_table[place].operands[1];
|
|
|
res->operands[2] = main_table[place].operands[2];
|
|
|
res->operands[3] = main_table[place].operands[3];
|
|
|
res->operands[4] = main_table[place].operands[4];
|
|
|
res->flags = main_table[place].flags;
|
|
|
res->ent_index = place;
|
|
|
res->dependencies = &op_dependencies[depind];
|
|
|
return res;
|
|
|
}
|
|
|
|
|
|
/* Determine the ia64_opcode entry for the opcode specified by INSN
|
|
|
and TYPE. If a valid entry is not found, return NULL. */
|
|
|
struct ia64_opcode *
|
|
|
ia64_dis_opcode (ia64_insn insn, enum ia64_insn_type type)
|
|
|
{
|
|
|
int disent = locate_opcode_ent (insn, type);
|
|
|
|
|
|
if (disent < 0)
|
|
|
{
|
|
|
return NULL;
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
unsigned int cb = ia64_dis_names[disent].completer_index;
|
|
|
static char name[128];
|
|
|
int place = ia64_dis_names[disent].insn_index;
|
|
|
int ci = main_table[place].completers;
|
|
|
ia64_insn tinsn = main_table[place].opcode;
|
|
|
|
|
|
strcpy (name, ia64_strings [main_table[place].name_index]);
|
|
|
|
|
|
while (cb)
|
|
|
{
|
|
|
if (cb & 1)
|
|
|
{
|
|
|
int cname = completer_table[ci].name_index;
|
|
|
|
|
|
tinsn = apply_completer (tinsn, ci);
|
|
|
|
|
|
if (ia64_strings[cname][0] != '\0')
|
|
|
{
|
|
|
strcat (name, ".");
|
|
|
strcat (name, ia64_strings[cname]);
|
|
|
}
|
|
|
if (cb != 1)
|
|
|
{
|
|
|
ci = completer_table[ci].subentries;
|
|
|
}
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
ci = completer_table[ci].alternative;
|
|
|
}
|
|
|
if (ci < 0)
|
|
|
{
|
|
|
abort ();
|
|
|
}
|
|
|
cb = cb >> 1;
|
|
|
}
|
|
|
if (tinsn != (insn & main_table[place].mask))
|
|
|
{
|
|
|
abort ();
|
|
|
}
|
|
|
return make_ia64_opcode (insn, name, place,
|
|
|
completer_table[ci].dependencies);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/* Search the main_opcode table starting from PLACE for an opcode that
|
|
|
matches NAME. Return NULL if one is not found. */
|
|
|
|
|
|
static struct ia64_opcode *
|
|
|
ia64_find_matching_opcode (const char *name, short place)
|
|
|
{
|
|
|
char op[129];
|
|
|
const char *suffix;
|
|
|
short name_index;
|
|
|
|
|
|
if ((unsigned) place >= ARRAY_SIZE (main_table))
|
|
|
return NULL;
|
|
|
|
|
|
if (strlen (name) > 128)
|
|
|
{
|
|
|
return NULL;
|
|
|
}
|
|
|
suffix = name;
|
|
|
get_opc_prefix (&suffix, op);
|
|
|
name_index = find_string_ent (op);
|
|
|
if (name_index < 0)
|
|
|
{
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
while (main_table[place].name_index == name_index)
|
|
|
{
|
|
|
const char *curr_suffix = suffix;
|
|
|
ia64_insn curr_insn = main_table[place].opcode;
|
|
|
short completer = -1;
|
|
|
|
|
|
do {
|
|
|
if (suffix[0] == '\0')
|
|
|
{
|
|
|
completer = find_completer (place, completer, suffix);
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
get_opc_prefix (&curr_suffix, op);
|
|
|
completer = find_completer (place, completer, op);
|
|
|
}
|
|
|
if (completer != -1)
|
|
|
{
|
|
|
curr_insn = apply_completer (curr_insn, completer);
|
|
|
}
|
|
|
} while (completer != -1 && curr_suffix[0] != '\0');
|
|
|
|
|
|
if (completer != -1 && curr_suffix[0] == '\0'
|
|
|
&& completer_table[completer].terminal_completer)
|
|
|
{
|
|
|
int depind = completer_table[completer].dependencies;
|
|
|
return make_ia64_opcode (curr_insn, name, place, depind);
|
|
|
}
|
|
|
else
|
|
|
{
|
|
|
place++;
|
|
|
}
|
|
|
}
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
/* Find the next opcode after PREV_ENT that matches PREV_ENT, or return NULL
|
|
|
if one does not exist.
|
|
|
|
|
|
It is the caller's responsibility to invoke ia64_free_opcode () to
|
|
|
release any resources used by the returned entry. */
|
|
|
|
|
|
struct ia64_opcode *
|
|
|
ia64_find_next_opcode (struct ia64_opcode *prev_ent)
|
|
|
{
|
|
|
return ia64_find_matching_opcode (prev_ent->name,
|
|
|
prev_ent->ent_index + 1);
|
|
|
}
|
|
|
|
|
|
/* Find the first opcode that matches NAME, or return NULL if it does
|
|
|
not exist.
|
|
|
|
|
|
It is the caller's responsibility to invoke ia64_free_opcode () to
|
|
|
release any resources used by the returned entry. */
|
|
|
|
|
|
struct ia64_opcode *
|
|
|
ia64_find_opcode (const char *name)
|
|
|
{
|
|
|
char op[129];
|
|
|
const char *suffix;
|
|
|
short place;
|
|
|
short name_index;
|
|
|
|
|
|
if (strlen (name) > 128)
|
|
|
{
|
|
|
return NULL;
|
|
|
}
|
|
|
suffix = name;
|
|
|
get_opc_prefix (&suffix, op);
|
|
|
name_index = find_string_ent (op);
|
|
|
if (name_index < 0)
|
|
|
{
|
|
|
return NULL;
|
|
|
}
|
|
|
|
|
|
place = find_main_ent (name_index);
|
|
|
|
|
|
if (place < 0)
|
|
|
{
|
|
|
return NULL;
|
|
|
}
|
|
|
return ia64_find_matching_opcode (name, place);
|
|
|
}
|
|
|
|
|
|
/* Free any resources used by ENT. */
|
|
|
void
|
|
|
ia64_free_opcode (struct ia64_opcode *ent)
|
|
|
{
|
|
|
free ((void *)ent->name);
|
|
|
free (ent);
|
|
|
}
|
|
|
|
|
|
const struct ia64_dependency *
|
|
|
ia64_find_dependency (int dep_index)
|
|
|
{
|
|
|
dep_index = DEP(dep_index);
|
|
|
|
|
|
if (dep_index < 0
|
|
|
|| dep_index >= (int) ARRAY_SIZE (dependencies))
|
|
|
return NULL;
|
|
|
|
|
|
return &dependencies[dep_index];
|
|
|
}
|