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594 lines
15 KiB
C
594 lines
15 KiB
C
/* Configurable Xtensa ISA support.
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Copyright 2003 Free Software Foundation, Inc.
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This file is part of BFD, the Binary File Descriptor library.
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This program 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 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public 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 program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <string.h>
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#include "xtensa-isa.h"
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#include "xtensa-isa-internal.h"
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xtensa_isa xtensa_default_isa = NULL;
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static int
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opname_lookup_compare (const void *v1, const void *v2)
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{
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opname_lookup_entry *e1 = (opname_lookup_entry *)v1;
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opname_lookup_entry *e2 = (opname_lookup_entry *)v2;
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return strcmp (e1->key, e2->key);
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}
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xtensa_isa
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xtensa_isa_init (void)
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{
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xtensa_isa isa;
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int mod;
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isa = xtensa_load_isa (0);
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if (isa == 0)
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{
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fprintf (stderr, "Failed to initialize Xtensa base ISA module\n");
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return NULL;
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}
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for (mod = 1; xtensa_isa_modules[mod].get_num_opcodes_fn; mod++)
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{
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if (!xtensa_extend_isa (isa, mod))
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{
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fprintf (stderr, "Failed to initialize Xtensa TIE ISA module\n");
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return NULL;
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}
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}
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return isa;
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}
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/* ISA information. */
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static int
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xtensa_check_isa_config (xtensa_isa_internal *isa,
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struct config_struct *config_table)
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{
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int i, j;
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if (!config_table)
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{
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fprintf (stderr, "Error: Empty configuration table in ISA DLL\n");
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return 0;
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}
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/* For the first module, save a pointer to the table and record the
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specified endianness and availability of the density option. */
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if (isa->num_modules == 0)
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{
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int found_memory_order = 0;
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isa->config = config_table;
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isa->has_density = 1; /* Default to have density option. */
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for (i = 0; config_table[i].param_name; i++)
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{
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if (!strcmp (config_table[i].param_name, "IsaMemoryOrder"))
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{
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isa->is_big_endian =
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(strcmp (config_table[i].param_value, "BigEndian") == 0);
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found_memory_order = 1;
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}
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if (!strcmp (config_table[i].param_name, "IsaUseDensityInstruction"))
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{
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isa->has_density = atoi (config_table[i].param_value);
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}
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}
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if (!found_memory_order)
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{
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fprintf (stderr, "Error: \"IsaMemoryOrder\" missing from "
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"configuration table in ISA DLL\n");
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return 0;
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}
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return 1;
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}
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/* For subsequent modules, check that the parameters match. Note: This
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code is sufficient to handle the current model where there are never
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more than 2 modules; we might at some point want to handle cases where
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module N > 0 specifies some parameters not included in the base table,
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and we would then add those to isa->config so that subsequent modules
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would check against them. */
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for (i = 0; config_table[i].param_name; i++)
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{
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for (j = 0; isa->config[j].param_name; j++)
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{
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if (!strcmp (config_table[i].param_name, isa->config[j].param_name))
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{
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int mismatch;
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if (!strcmp (config_table[i].param_name, "IsaCoprocessorCount"))
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{
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/* Only require the coprocessor count to be <= the base. */
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int tiecnt = atoi (config_table[i].param_value);
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int basecnt = atoi (isa->config[j].param_value);
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mismatch = (tiecnt > basecnt);
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}
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else
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mismatch = strcmp (config_table[i].param_value,
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isa->config[j].param_value);
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if (mismatch)
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{
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#define MISMATCH_MESSAGE \
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"Error: Configuration mismatch in the \"%s\" parameter:\n\
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the configuration used when the TIE file was compiled had a value of\n\
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\"%s\", while the current configuration has a value of\n\
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\"%s\". Please rerun the TIE compiler with a matching\n\
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configuration.\n"
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fprintf (stderr, MISMATCH_MESSAGE,
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config_table[i].param_name,
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config_table[i].param_value,
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isa->config[j].param_value);
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return 0;
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}
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break;
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}
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}
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}
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return 1;
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}
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static int
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xtensa_add_isa (xtensa_isa_internal *isa, libisa_module_specifier libisa)
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{
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const int (*get_num_opcodes_fn) (void);
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struct config_struct *(*get_config_table_fn) (void);
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xtensa_opcode_internal **(*get_opcodes_fn) (void);
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int (*decode_insn_fn) (const xtensa_insnbuf);
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xtensa_opcode_internal **opcodes;
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int opc, insn_size, prev_num_opcodes, new_num_opcodes, this_module;
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get_num_opcodes_fn = xtensa_isa_modules[libisa].get_num_opcodes_fn;
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get_opcodes_fn = xtensa_isa_modules[libisa].get_opcodes_fn;
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decode_insn_fn = xtensa_isa_modules[libisa].decode_insn_fn;
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get_config_table_fn = xtensa_isa_modules[libisa].get_config_table_fn;
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if (!get_num_opcodes_fn || !get_opcodes_fn || !decode_insn_fn
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|| (!get_config_table_fn && isa->num_modules == 0))
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return 0;
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if (get_config_table_fn
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&& !xtensa_check_isa_config (isa, get_config_table_fn ()))
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return 0;
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prev_num_opcodes = isa->num_opcodes;
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new_num_opcodes = (*get_num_opcodes_fn) ();
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isa->num_opcodes += new_num_opcodes;
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isa->opcode_table = (xtensa_opcode_internal **)
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realloc (isa->opcode_table, isa->num_opcodes *
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sizeof (xtensa_opcode_internal *));
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isa->opname_lookup_table = (opname_lookup_entry *)
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realloc (isa->opname_lookup_table, isa->num_opcodes *
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sizeof (opname_lookup_entry));
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opcodes = (*get_opcodes_fn) ();
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insn_size = isa->insn_size;
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for (opc = 0; opc < new_num_opcodes; opc++)
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{
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xtensa_opcode_internal *intopc = opcodes[opc];
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int newopc = prev_num_opcodes + opc;
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isa->opcode_table[newopc] = intopc;
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isa->opname_lookup_table[newopc].key = intopc->name;
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isa->opname_lookup_table[newopc].opcode = newopc;
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if (intopc->length > insn_size)
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insn_size = intopc->length;
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}
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isa->insn_size = insn_size;
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isa->insnbuf_size = ((isa->insn_size + sizeof (xtensa_insnbuf_word) - 1) /
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sizeof (xtensa_insnbuf_word));
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qsort (isa->opname_lookup_table, isa->num_opcodes,
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sizeof (opname_lookup_entry), opname_lookup_compare);
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/* Check for duplicate opcode names. */
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for (opc = 1; opc < isa->num_opcodes; opc++)
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{
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if (!opname_lookup_compare (&isa->opname_lookup_table[opc-1],
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&isa->opname_lookup_table[opc]))
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{
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fprintf (stderr, "Error: Duplicate TIE opcode \"%s\"\n",
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isa->opname_lookup_table[opc].key);
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return 0;
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}
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}
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this_module = isa->num_modules;
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isa->num_modules += 1;
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isa->module_opcode_base = (int *) realloc (isa->module_opcode_base,
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isa->num_modules * sizeof (int));
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isa->module_decode_fn = (xtensa_insn_decode_fn *)
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realloc (isa->module_decode_fn, isa->num_modules *
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sizeof (xtensa_insn_decode_fn));
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isa->module_opcode_base[this_module] = prev_num_opcodes;
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isa->module_decode_fn[this_module] = decode_insn_fn;
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xtensa_default_isa = isa;
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return 1; /* Library was successfully added. */
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}
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xtensa_isa
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xtensa_load_isa (libisa_module_specifier libisa)
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{
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xtensa_isa_internal *isa;
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isa = (xtensa_isa_internal *) malloc (sizeof (xtensa_isa_internal));
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memset (isa, 0, sizeof (xtensa_isa_internal));
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if (!xtensa_add_isa (isa, libisa))
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{
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xtensa_isa_free (isa);
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return NULL;
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}
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return (xtensa_isa) isa;
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}
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int
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xtensa_extend_isa (xtensa_isa isa, libisa_module_specifier libisa)
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{
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xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
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return xtensa_add_isa (intisa, libisa);
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}
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void
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xtensa_isa_free (xtensa_isa isa)
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{
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xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
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if (intisa->opcode_table)
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free (intisa->opcode_table);
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if (intisa->opname_lookup_table)
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free (intisa->opname_lookup_table);
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if (intisa->module_opcode_base)
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free (intisa->module_opcode_base);
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if (intisa->module_decode_fn)
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free (intisa->module_decode_fn);
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free (intisa);
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}
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int
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xtensa_insn_maxlength (xtensa_isa isa)
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{
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xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
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return intisa->insn_size;
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}
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int
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xtensa_insnbuf_size (xtensa_isa isa)
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{
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xtensa_isa_internal *intisa = (xtensa_isa_internal *)isa;
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return intisa->insnbuf_size;
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}
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int
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xtensa_num_opcodes (xtensa_isa isa)
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{
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xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
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return intisa->num_opcodes;
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}
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xtensa_opcode
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xtensa_opcode_lookup (xtensa_isa isa, const char *opname)
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{
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xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
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opname_lookup_entry entry, *result;
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entry.key = opname;
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result = bsearch (&entry, intisa->opname_lookup_table, intisa->num_opcodes,
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sizeof (opname_lookup_entry), opname_lookup_compare);
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if (!result) return XTENSA_UNDEFINED;
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return result->opcode;
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}
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xtensa_opcode
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xtensa_decode_insn (xtensa_isa isa, const xtensa_insnbuf insn)
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{
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xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
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int n, opc;
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for (n = 0; n < intisa->num_modules; n++) {
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opc = (intisa->module_decode_fn[n]) (insn);
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if (opc != XTENSA_UNDEFINED)
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return intisa->module_opcode_base[n] + opc;
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}
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return XTENSA_UNDEFINED;
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}
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/* Opcode information. */
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void
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xtensa_encode_insn (xtensa_isa isa, xtensa_opcode opc, xtensa_insnbuf insn)
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{
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xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
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xtensa_insnbuf template = intisa->opcode_table[opc]->template();
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int len = intisa->opcode_table[opc]->length;
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int n;
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/* Convert length to 32-bit words. */
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len = (len + 3) / 4;
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/* Copy the template. */
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for (n = 0; n < len; n++)
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insn[n] = template[n];
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/* Fill any unused buffer space with zeros. */
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for ( ; n < intisa->insnbuf_size; n++)
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insn[n] = 0;
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}
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const char *
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xtensa_opcode_name (xtensa_isa isa, xtensa_opcode opc)
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{
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xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
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return intisa->opcode_table[opc]->name;
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}
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int
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xtensa_insn_length (xtensa_isa isa, xtensa_opcode opc)
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{
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xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
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return intisa->opcode_table[opc]->length;
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}
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int
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xtensa_insn_length_from_first_byte (xtensa_isa isa, char first_byte)
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{
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xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
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int is_density = (first_byte & (intisa->is_big_endian ? 0x80 : 0x08)) != 0;
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return (intisa->has_density && is_density ? 2 : 3);
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}
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int
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xtensa_num_operands (xtensa_isa isa, xtensa_opcode opc)
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{
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xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
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return intisa->opcode_table[opc]->iclass->num_operands;
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}
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xtensa_operand
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xtensa_get_operand (xtensa_isa isa, xtensa_opcode opc, int opnd)
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{
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xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
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xtensa_iclass_internal *iclass = intisa->opcode_table[opc]->iclass;
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if (opnd >= iclass->num_operands)
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return NULL;
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return (xtensa_operand) iclass->operands[opnd];
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}
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/* Operand information. */
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char *
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xtensa_operand_kind (xtensa_operand opnd)
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{
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xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
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return intop->operand_kind;
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}
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char
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xtensa_operand_inout (xtensa_operand opnd)
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{
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xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
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return intop->inout;
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}
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uint32
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xtensa_operand_get_field (xtensa_operand opnd, const xtensa_insnbuf insn)
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{
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xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
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return (*intop->get_field) (insn);
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}
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void
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xtensa_operand_set_field (xtensa_operand opnd, xtensa_insnbuf insn, uint32 val)
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{
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xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
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return (*intop->set_field) (insn, val);
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}
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xtensa_encode_result
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xtensa_operand_encode (xtensa_operand opnd, uint32 *valp)
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{
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xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
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return (*intop->encode) (valp);
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}
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uint32
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xtensa_operand_decode (xtensa_operand opnd, uint32 val)
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{
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xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
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return (*intop->decode) (val);
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}
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int
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xtensa_operand_isPCRelative (xtensa_operand opnd)
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{
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xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
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return intop->isPCRelative;
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}
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uint32
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xtensa_operand_do_reloc (xtensa_operand opnd, uint32 addr, uint32 pc)
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{
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xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
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if (!intop->isPCRelative)
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return addr;
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return (*intop->do_reloc) (addr, pc);
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}
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uint32
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xtensa_operand_undo_reloc (xtensa_operand opnd, uint32 offset, uint32 pc)
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{
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xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
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if (!intop->isPCRelative)
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return offset;
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return (*intop->undo_reloc) (offset, pc);
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}
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/* Instruction buffers. */
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xtensa_insnbuf
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xtensa_insnbuf_alloc (xtensa_isa isa)
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{
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return (xtensa_insnbuf) malloc (xtensa_insnbuf_size (isa) *
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sizeof (xtensa_insnbuf_word));
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}
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void
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xtensa_insnbuf_free (xtensa_insnbuf buf)
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{
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free( buf );
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}
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/* Given <byte_index>, the index of a byte in a xtensa_insnbuf, our
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internal representation of a xtensa instruction word, return the index of
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its word and the bit index of its low order byte in the xtensa_insnbuf. */
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static inline int
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byte_to_word_index (int byte_index)
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{
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return byte_index / sizeof (xtensa_insnbuf_word);
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}
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static inline int
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byte_to_bit_index (int byte_index)
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{
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return (byte_index & 0x3) * 8;
|
|
}
|
|
|
|
|
|
/* Copy an instruction in the 32 bit words pointed at by <insn> to characters
|
|
pointed at by <cp>. This is more complicated than you might think because
|
|
we want 16 bit instructions in bytes 2,3 for big endian. This function
|
|
allows us to specify which byte in <insn> to start with and which way to
|
|
increment, allowing trivial implementation for both big and little endian.
|
|
And it seems to make pretty good code for both. */
|
|
|
|
void
|
|
xtensa_insnbuf_to_chars (xtensa_isa isa, const xtensa_insnbuf insn, char *cp)
|
|
{
|
|
xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
|
|
int insn_size = xtensa_insn_maxlength (intisa);
|
|
int fence_post, start, increment, i, byte_count;
|
|
xtensa_opcode opc;
|
|
|
|
if (intisa->is_big_endian)
|
|
{
|
|
start = insn_size - 1;
|
|
increment = -1;
|
|
}
|
|
else
|
|
{
|
|
start = 0;
|
|
increment = 1;
|
|
}
|
|
|
|
/* Find the opcode; do nothing if the buffer does not contain a valid
|
|
instruction since we need to know how many bytes to copy. */
|
|
opc = xtensa_decode_insn (isa, insn);
|
|
if (opc == XTENSA_UNDEFINED)
|
|
return;
|
|
|
|
byte_count = xtensa_insn_length (isa, opc);
|
|
fence_post = start + (byte_count * increment);
|
|
|
|
for (i = start; i != fence_post; i += increment, ++cp)
|
|
{
|
|
int word_inx = byte_to_word_index (i);
|
|
int bit_inx = byte_to_bit_index (i);
|
|
|
|
*cp = (insn[word_inx] >> bit_inx) & 0xff;
|
|
}
|
|
}
|
|
|
|
/* Inward conversion from byte stream to xtensa_insnbuf. See
|
|
xtensa_insnbuf_to_chars for a discussion of why this is
|
|
complicated by endianness. */
|
|
|
|
void
|
|
xtensa_insnbuf_from_chars (xtensa_isa isa, xtensa_insnbuf insn, const char* cp)
|
|
{
|
|
xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
|
|
int insn_size = xtensa_insn_maxlength (intisa);
|
|
int fence_post, start, increment, i;
|
|
|
|
if (intisa->is_big_endian)
|
|
{
|
|
start = insn_size - 1;
|
|
increment = -1;
|
|
}
|
|
else
|
|
{
|
|
start = 0;
|
|
increment = 1;
|
|
}
|
|
|
|
fence_post = start + (insn_size * increment);
|
|
memset (insn, 0, xtensa_insnbuf_size (isa) * sizeof (xtensa_insnbuf_word));
|
|
|
|
for ( i = start; i != fence_post; i += increment, ++cp )
|
|
{
|
|
int word_inx = byte_to_word_index (i);
|
|
int bit_inx = byte_to_bit_index (i);
|
|
|
|
insn[word_inx] |= (*cp & 0xff) << bit_inx;
|
|
}
|
|
}
|
|
|