820 lines
23 KiB
C
820 lines
23 KiB
C
/* The IGEN simulator generator for GDB, the GNU Debugger.
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Copyright 2002-2015 Free Software Foundation, Inc.
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Contributed by Andrew Cagney.
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This file is part of GDB.
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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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "misc.h"
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#include "lf.h"
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#include "table.h"
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#include "filter.h"
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#include "igen.h"
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#include "ld-insn.h"
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#include "ld-decode.h"
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#include "gen.h"
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#include "gen-semantics.h"
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#include "gen-idecode.h"
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#include "gen-icache.h"
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static void
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print_icache_function_header (lf *file,
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const char *basename,
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const char *format_name,
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opcode_bits *expanded_bits,
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int is_function_definition,
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int nr_prefetched_words)
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{
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lf_printf (file, "\n");
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lf_print__function_type_function (file, print_icache_function_type,
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"EXTERN_ICACHE", " ");
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print_function_name (file,
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basename, format_name, NULL,
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expanded_bits, function_name_prefix_icache);
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lf_printf (file, "\n(");
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print_icache_function_formal (file, nr_prefetched_words);
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lf_printf (file, ")");
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if (!is_function_definition)
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lf_printf (file, ";");
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lf_printf (file, "\n");
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}
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void
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print_icache_declaration (lf *file,
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insn_entry * insn,
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opcode_bits *expanded_bits,
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insn_opcodes *opcodes, int nr_prefetched_words)
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{
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print_icache_function_header (file,
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insn->name,
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insn->format_name,
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expanded_bits,
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0 /* is not function definition */ ,
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nr_prefetched_words);
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}
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static void
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print_icache_extraction (lf *file,
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const char *format_name,
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cache_entry_type cache_type,
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const char *entry_name,
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const char *entry_type,
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const char *entry_expression,
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char *single_insn_field,
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line_ref *line,
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insn_field_entry *cur_field,
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opcode_bits *expanded_bits,
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icache_decl_type what_to_declare,
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icache_body_type what_to_do)
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{
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const char *expression;
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opcode_bits *bits;
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char *reason;
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ASSERT (format_name != NULL);
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ASSERT (entry_name != NULL);
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/* figure out exactly what should be going on here */
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switch (cache_type)
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{
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case scratch_value:
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if ((what_to_do & put_values_in_icache)
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|| what_to_do == do_not_use_icache)
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{
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reason = "scratch";
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what_to_do = do_not_use_icache;
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}
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else
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return;
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break;
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case compute_value:
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if ((what_to_do & get_values_from_icache)
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|| what_to_do == do_not_use_icache)
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{
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reason = "compute";
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what_to_do = do_not_use_icache;
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}
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else
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return;
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break;
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case cache_value:
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if ((what_to_declare != undef_variables)
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|| !(what_to_do & put_values_in_icache))
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{
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reason = "cache";
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what_to_declare = ((what_to_do & put_values_in_icache)
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? declare_variables : what_to_declare);
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}
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else
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return;
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break;
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default:
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abort (); /* Bad switch. */
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}
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/* For the type, default to a simple unsigned */
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if (entry_type == NULL || strlen (entry_type) == 0)
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entry_type = "unsigned";
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/* look through the set of expanded sub fields to see if this field
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has been given a constant value */
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for (bits = expanded_bits; bits != NULL; bits = bits->next)
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{
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if (bits->field == cur_field)
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break;
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}
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/* Define a storage area for the cache element */
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switch (what_to_declare)
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{
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case undef_variables:
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/* We've finished with the #define value - destory it */
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lf_indent_suppress (file);
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lf_printf (file, "#undef %s\n", entry_name);
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return;
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case define_variables:
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/* Using direct access for this entry, clear any prior
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definition, then define it */
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lf_indent_suppress (file);
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lf_printf (file, "#undef %s\n", entry_name);
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/* Don't type cast pointer types! */
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lf_indent_suppress (file);
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if (strchr (entry_type, '*') != NULL)
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lf_printf (file, "#define %s (", entry_name);
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else
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lf_printf (file, "#define %s ((%s) ", entry_name, entry_type);
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break;
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case declare_variables:
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/* using variables to define the value */
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if (line != NULL)
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lf_print__line_ref (file, line);
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lf_printf (file, "%s const %s UNUSED = ", entry_type, entry_name);
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break;
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}
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/* define a value for that storage area as determined by what is in
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the cache */
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if (bits != NULL
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&& single_insn_field != NULL
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&& strcmp (entry_name, single_insn_field) == 0
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&& strcmp (entry_name, cur_field->val_string) == 0
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&& ((bits->opcode->is_boolean && bits->value == 0)
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|| (!bits->opcode->is_boolean)))
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{
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/* The cache rule is specifying what to do with a simple
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instruction field.
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Because of instruction expansion, the field is either a
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constant value or equal to the specified constant (boolean
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comparison). (The latter indicated by bits->value == 0).
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The case of a field not being equal to the specified boolean
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value is handled later. */
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expression = "constant field";
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ASSERT (bits->field == cur_field);
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if (bits->opcode->is_boolean)
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{
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ASSERT (bits->value == 0);
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lf_printf (file, "%d", bits->opcode->boolean_constant);
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}
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else if (bits->opcode->last < bits->field->last)
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{
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lf_printf (file, "%d",
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bits->value << (bits->field->last - bits->opcode->last));
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}
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else
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{
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lf_printf (file, "%d", bits->value);
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}
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}
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else if (bits != NULL
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&& single_insn_field != NULL
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&& strncmp (entry_name,
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single_insn_field,
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strlen (single_insn_field)) == 0
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&& strncmp (entry_name + strlen (single_insn_field),
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"_is_",
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strlen ("_is_")) == 0
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&& ((bits->opcode->is_boolean
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&& ((unsigned)
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atol (entry_name + strlen (single_insn_field) +
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strlen ("_is_")) == bits->opcode->boolean_constant))
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|| (!bits->opcode->is_boolean)))
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{
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/* The cache rule defines an entry for the comparison between a
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single instruction field and a constant. The value of the
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comparison in someway matches that of the opcode field that
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was made constant through expansion. */
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expression = "constant compare";
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if (bits->opcode->is_boolean)
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{
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lf_printf (file, "%d /* %s == %d */",
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bits->value == 0,
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single_insn_field, bits->opcode->boolean_constant);
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}
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else if (bits->opcode->last < bits->field->last)
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{
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lf_printf (file, "%d /* %s == %d */",
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(atol
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(entry_name + strlen (single_insn_field) +
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strlen ("_is_")) ==
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(bits->
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value << (bits->field->last - bits->opcode->last))),
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single_insn_field,
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(bits->
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value << (bits->field->last - bits->opcode->last)));
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}
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else
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{
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lf_printf (file, "%d /* %s == %d */",
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(atol
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(entry_name + strlen (single_insn_field) +
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strlen ("_is_")) == bits->value), single_insn_field,
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bits->value);
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}
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}
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else
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{
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/* put the field in the local variable, possibly also enter it
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into the cache */
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expression = "extraction";
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/* handle the cache */
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if ((what_to_do & get_values_from_icache)
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|| (what_to_do & put_values_in_icache))
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{
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lf_printf (file, "cache_entry->crack.%s.%s",
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format_name, entry_name);
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if (what_to_do & put_values_in_icache) /* also put it in the cache? */
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{
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lf_printf (file, " = ");
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}
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}
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if ((what_to_do & put_values_in_icache)
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|| what_to_do == do_not_use_icache)
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{
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if (cur_field != NULL)
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{
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if (entry_expression != NULL && strlen (entry_expression) > 0)
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error (line,
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"Instruction field entry with nonempty expression\n");
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if (cur_field->first == 0
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&& cur_field->last == options.insn_bit_size - 1)
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lf_printf (file, "(instruction_%d)", cur_field->word_nr);
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else if (cur_field->last == options.insn_bit_size - 1)
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lf_printf (file, "MASKED%d (instruction_%d, %d, %d)",
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options.insn_bit_size,
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cur_field->word_nr,
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i2target (options.hi_bit_nr, cur_field->first),
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i2target (options.hi_bit_nr, cur_field->last));
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else
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lf_printf (file, "EXTRACTED%d (instruction_%d, %d, %d)",
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options.insn_bit_size,
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cur_field->word_nr,
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i2target (options.hi_bit_nr, cur_field->first),
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i2target (options.hi_bit_nr, cur_field->last));
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}
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else
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{
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lf_printf (file, "%s", entry_expression);
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}
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}
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}
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switch (what_to_declare)
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{
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case define_variables:
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lf_printf (file, ")");
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break;
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case undef_variables:
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break;
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case declare_variables:
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lf_printf (file, ";");
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break;
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}
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ASSERT (reason != NULL && expression != NULL);
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lf_printf (file, " /* %s - %s */\n", reason, expression);
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}
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void
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print_icache_body (lf *file,
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insn_entry * instruction,
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opcode_bits *expanded_bits,
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cache_entry *cache_rules,
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icache_decl_type what_to_declare,
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icache_body_type what_to_do, int nr_prefetched_words)
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{
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/* extract instruction fields */
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lf_printf (file, "/* Extraction: %s\n", instruction->name);
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lf_printf (file, " ");
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switch (what_to_declare)
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{
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case define_variables:
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lf_printf (file, "#define");
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break;
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case declare_variables:
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lf_printf (file, "declare");
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break;
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case undef_variables:
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lf_printf (file, "#undef");
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break;
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}
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lf_printf (file, " ");
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switch (what_to_do)
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{
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case get_values_from_icache:
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lf_printf (file, "get-values-from-icache");
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break;
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case put_values_in_icache:
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lf_printf (file, "put-values-in-icache");
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break;
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case both_values_and_icache:
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lf_printf (file, "get-values-from-icache|put-values-in-icache");
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break;
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case do_not_use_icache:
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lf_printf (file, "do-not-use-icache");
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break;
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}
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lf_printf (file, "\n ");
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print_insn_words (file, instruction);
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lf_printf (file, " */\n");
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/* pass zero - fetch from memory any missing instructions.
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Some of the instructions will have already been fetched (in the
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instruction array), others will still need fetching. */
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switch (what_to_do)
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{
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case get_values_from_icache:
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break;
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case put_values_in_icache:
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case both_values_and_icache:
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case do_not_use_icache:
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{
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int word_nr;
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switch (what_to_declare)
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{
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case undef_variables:
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break;
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case define_variables:
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case declare_variables:
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for (word_nr = nr_prefetched_words;
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word_nr < instruction->nr_words; word_nr++)
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{
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/* FIXME - should be using print_icache_extraction? */
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lf_printf (file,
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"%sinstruction_word instruction_%d UNUSED = ",
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options.module.global.prefix.l, word_nr);
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lf_printf (file, "IMEM%d_IMMED (cia, %d)",
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options.insn_bit_size, word_nr);
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lf_printf (file, ";\n");
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}
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}
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}
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}
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/* if putting the instruction words in the cache, define references
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for them */
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if (options.gen.insn_in_icache)
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{
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/* FIXME: is the instruction_word type correct? */
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print_icache_extraction (file, instruction->format_name, cache_value, "insn", /* name */
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"instruction_word", /* type */
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"instruction", /* expression */
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NULL, /* origin */
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NULL, /* line */
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NULL, NULL, what_to_declare, what_to_do);
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}
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lf_printf (file, "\n");
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/* pass one - process instruction fields.
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If there is no cache rule, the default is to enter the field into
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the cache */
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{
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insn_word_entry *word;
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for (word = instruction->words; word != NULL; word = word->next)
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{
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insn_field_entry *cur_field;
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for (cur_field = word->first;
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cur_field->first < options.insn_bit_size;
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cur_field = cur_field->next)
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{
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/* Always expand named fields (even if constant), so
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references are valid. */
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if (cur_field->type == insn_field_string)
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{
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cache_entry *cache_rule;
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cache_entry_type value_type = cache_value;
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line_ref *value_line = instruction->line;
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/* check the cache table to see if it contains a rule
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overriding the default cache action for an
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instruction field */
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for (cache_rule = cache_rules;
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cache_rule != NULL; cache_rule = cache_rule->next)
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{
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if (filter_is_subset (instruction->field_names,
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cache_rule->original_fields)
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&& strcmp (cache_rule->name,
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cur_field->val_string) == 0)
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{
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value_type = cache_rule->entry_type;
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value_line = cache_rule->line;
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if (value_type == compute_value)
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{
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options.warning (cache_rule->line,
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"instruction field of type `compute' changed to `cache'\n");
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cache_rule->entry_type = cache_value;
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}
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break;
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}
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}
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/* Define an entry for the field within the
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instruction */
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print_icache_extraction (file, instruction->format_name, value_type, cur_field->val_string, /* name */
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NULL, /* type */
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NULL, /* expression */
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cur_field->val_string, /* insn field */
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value_line,
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cur_field,
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expanded_bits,
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what_to_declare, what_to_do);
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}
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}
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}
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}
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/* pass two - any cache fields not processed above */
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{
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cache_entry *cache_rule;
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for (cache_rule = cache_rules;
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cache_rule != NULL; cache_rule = cache_rule->next)
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{
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if (filter_is_subset (instruction->field_names,
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cache_rule->original_fields)
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&& !filter_is_member (instruction->field_names, cache_rule->name))
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{
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char *single_field =
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filter_next (cache_rule->original_fields, "");
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if (filter_next (cache_rule->original_fields, single_field) !=
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NULL)
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single_field = NULL;
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print_icache_extraction (file, instruction->format_name, cache_rule->entry_type, cache_rule->name, cache_rule->type, cache_rule->expression, single_field, cache_rule->line, NULL, /* cur_field */
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expanded_bits,
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what_to_declare, what_to_do);
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}
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}
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}
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lf_print__internal_ref (file);
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}
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typedef struct _form_fields form_fields;
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struct _form_fields
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{
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char *name;
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filter *fields;
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form_fields *next;
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};
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static form_fields *
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insn_table_cache_fields (insn_table *isa)
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{
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form_fields *forms = NULL;
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insn_entry *insn;
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for (insn = isa->insns; insn != NULL; insn = insn->next)
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{
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form_fields **form = &forms;
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while (1)
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{
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if (*form == NULL)
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{
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/* new format name, add it */
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form_fields *new_form = ZALLOC (form_fields);
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new_form->name = insn->format_name;
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filter_add (&new_form->fields, insn->field_names);
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*form = new_form;
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break;
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}
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else if (strcmp ((*form)->name, insn->format_name) == 0)
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{
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/* already present, add field names to the existing list */
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filter_add (&(*form)->fields, insn->field_names);
|
|
break;
|
|
}
|
|
form = &(*form)->next;
|
|
}
|
|
}
|
|
return forms;
|
|
}
|
|
|
|
|
|
|
|
extern void
|
|
print_icache_struct (lf *file, insn_table *isa, cache_entry *cache_rules)
|
|
{
|
|
/* Create a list of all the different instruction formats with their
|
|
corresponding field names. */
|
|
form_fields *formats = insn_table_cache_fields (isa);
|
|
|
|
lf_printf (file, "\n");
|
|
lf_printf (file, "#define WITH_%sIDECODE_CACHE_SIZE %d\n",
|
|
options.module.global.prefix.u,
|
|
(options.gen.icache ? options.gen.icache_size : 0));
|
|
lf_printf (file, "\n");
|
|
|
|
/* create an instruction cache if being used */
|
|
if (options.gen.icache)
|
|
{
|
|
lf_printf (file, "typedef struct _%sidecode_cache {\n",
|
|
options.module.global.prefix.l);
|
|
lf_indent (file, +2);
|
|
{
|
|
form_fields *format;
|
|
lf_printf (file, "unsigned_word address;\n");
|
|
lf_printf (file, "void *semantic;\n");
|
|
lf_printf (file, "union {\n");
|
|
lf_indent (file, +2);
|
|
for (format = formats; format != NULL; format = format->next)
|
|
{
|
|
lf_printf (file, "struct {\n");
|
|
lf_indent (file, +2);
|
|
{
|
|
cache_entry *cache_rule;
|
|
char *field;
|
|
/* space for any instruction words */
|
|
if (options.gen.insn_in_icache)
|
|
lf_printf (file, "instruction_word insn[%d];\n",
|
|
isa->max_nr_words);
|
|
/* define an entry for any applicable cache rules */
|
|
for (cache_rule = cache_rules;
|
|
cache_rule != NULL; cache_rule = cache_rule->next)
|
|
{
|
|
/* nb - sort of correct - should really check against
|
|
individual instructions */
|
|
if (filter_is_subset
|
|
(format->fields, cache_rule->original_fields))
|
|
{
|
|
char *memb;
|
|
lf_printf (file, "%s %s;",
|
|
(cache_rule->type == NULL
|
|
? "unsigned"
|
|
: cache_rule->type), cache_rule->name);
|
|
lf_printf (file, " /*");
|
|
for (memb =
|
|
filter_next (cache_rule->original_fields, "");
|
|
memb != NULL;
|
|
memb =
|
|
filter_next (cache_rule->original_fields, memb))
|
|
{
|
|
lf_printf (file, " %s", memb);
|
|
}
|
|
lf_printf (file, " */\n");
|
|
}
|
|
}
|
|
/* define an entry for any fields not covered by a cache rule */
|
|
for (field = filter_next (format->fields, "");
|
|
field != NULL; field = filter_next (format->fields, field))
|
|
{
|
|
cache_entry *cache_rule;
|
|
int found_rule = 0;
|
|
for (cache_rule = cache_rules;
|
|
cache_rule != NULL; cache_rule = cache_rule->next)
|
|
{
|
|
if (strcmp (cache_rule->name, field) == 0)
|
|
{
|
|
found_rule = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (!found_rule)
|
|
lf_printf (file, "unsigned %s; /* default */\n", field);
|
|
}
|
|
}
|
|
lf_indent (file, -2);
|
|
lf_printf (file, "} %s;\n", format->name);
|
|
}
|
|
lf_indent (file, -2);
|
|
lf_printf (file, "} crack;\n");
|
|
}
|
|
lf_indent (file, -2);
|
|
lf_printf (file, "} %sidecode_cache;\n",
|
|
options.module.global.prefix.l);
|
|
}
|
|
else
|
|
{
|
|
/* alernativly, since no cache, emit a dummy definition for
|
|
idecode_cache so that code refering to the type can still compile */
|
|
lf_printf (file, "typedef void %sidecode_cache;\n",
|
|
options.module.global.prefix.l);
|
|
}
|
|
lf_printf (file, "\n");
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
print_icache_function (lf *file,
|
|
insn_entry * instruction,
|
|
opcode_bits *expanded_bits,
|
|
insn_opcodes *opcodes,
|
|
cache_entry *cache_rules, int nr_prefetched_words)
|
|
{
|
|
int indent;
|
|
|
|
/* generate code to enter decoded instruction into the icache */
|
|
lf_printf (file, "\n");
|
|
lf_print__function_type_function (file, print_icache_function_type,
|
|
"EXTERN_ICACHE", "\n");
|
|
indent = print_function_name (file,
|
|
instruction->name,
|
|
instruction->format_name,
|
|
NULL,
|
|
expanded_bits, function_name_prefix_icache);
|
|
indent += lf_printf (file, " ");
|
|
lf_indent (file, +indent);
|
|
lf_printf (file, "(");
|
|
print_icache_function_formal (file, nr_prefetched_words);
|
|
lf_printf (file, ")\n");
|
|
lf_indent (file, -indent);
|
|
|
|
/* function header */
|
|
lf_printf (file, "{\n");
|
|
lf_indent (file, +2);
|
|
|
|
print_my_defines (file,
|
|
instruction->name,
|
|
instruction->format_name, expanded_bits);
|
|
print_itrace (file, instruction, 1 /*putting-value-in-cache */ );
|
|
|
|
print_idecode_validate (file, instruction, opcodes);
|
|
|
|
lf_printf (file, "\n");
|
|
lf_printf (file, "{\n");
|
|
lf_indent (file, +2);
|
|
if (options.gen.semantic_icache)
|
|
lf_printf (file, "unsigned_word nia;\n");
|
|
print_icache_body (file,
|
|
instruction,
|
|
expanded_bits,
|
|
cache_rules,
|
|
(options.gen.direct_access
|
|
? define_variables
|
|
: declare_variables),
|
|
(options.gen.semantic_icache
|
|
? both_values_and_icache
|
|
: put_values_in_icache), nr_prefetched_words);
|
|
|
|
lf_printf (file, "\n");
|
|
lf_printf (file, "cache_entry->address = cia;\n");
|
|
lf_printf (file, "cache_entry->semantic = ");
|
|
print_function_name (file,
|
|
instruction->name,
|
|
instruction->format_name,
|
|
NULL, expanded_bits, function_name_prefix_semantics);
|
|
lf_printf (file, ";\n");
|
|
lf_printf (file, "\n");
|
|
|
|
if (options.gen.semantic_icache)
|
|
{
|
|
lf_printf (file, "/* semantic routine */\n");
|
|
print_semantic_body (file, instruction, expanded_bits, opcodes);
|
|
lf_printf (file, "return nia;\n");
|
|
}
|
|
|
|
if (!options.gen.semantic_icache)
|
|
{
|
|
lf_printf (file, "/* return the function proper */\n");
|
|
lf_printf (file, "return ");
|
|
print_function_name (file,
|
|
instruction->name,
|
|
instruction->format_name,
|
|
NULL,
|
|
expanded_bits, function_name_prefix_semantics);
|
|
lf_printf (file, ";\n");
|
|
}
|
|
|
|
if (options.gen.direct_access)
|
|
{
|
|
print_icache_body (file,
|
|
instruction,
|
|
expanded_bits,
|
|
cache_rules,
|
|
undef_variables,
|
|
(options.gen.semantic_icache
|
|
? both_values_and_icache
|
|
: put_values_in_icache), nr_prefetched_words);
|
|
}
|
|
|
|
lf_indent (file, -2);
|
|
lf_printf (file, "}\n");
|
|
lf_indent (file, -2);
|
|
lf_printf (file, "}\n");
|
|
}
|
|
|
|
|
|
void
|
|
print_icache_definition (lf *file,
|
|
insn_entry * insn,
|
|
opcode_bits *expanded_bits,
|
|
insn_opcodes *opcodes,
|
|
cache_entry *cache_rules, int nr_prefetched_words)
|
|
{
|
|
print_icache_function (file,
|
|
insn,
|
|
expanded_bits,
|
|
opcodes, cache_rules, nr_prefetched_words);
|
|
}
|
|
|
|
|
|
|
|
void
|
|
print_icache_internal_function_declaration (lf *file,
|
|
function_entry * function,
|
|
void *data)
|
|
{
|
|
ASSERT (options.gen.icache);
|
|
if (function->is_internal)
|
|
{
|
|
lf_printf (file, "\n");
|
|
lf_print__function_type_function (file, print_icache_function_type,
|
|
"INLINE_ICACHE", "\n");
|
|
print_function_name (file,
|
|
function->name,
|
|
NULL, NULL, NULL, function_name_prefix_icache);
|
|
lf_printf (file, "\n(");
|
|
print_icache_function_formal (file, 0);
|
|
lf_printf (file, ");\n");
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
print_icache_internal_function_definition (lf *file,
|
|
function_entry * function,
|
|
void *data)
|
|
{
|
|
ASSERT (options.gen.icache);
|
|
if (function->is_internal)
|
|
{
|
|
lf_printf (file, "\n");
|
|
lf_print__function_type_function (file, print_icache_function_type,
|
|
"INLINE_ICACHE", "\n");
|
|
print_function_name (file,
|
|
function->name,
|
|
NULL, NULL, NULL, function_name_prefix_icache);
|
|
lf_printf (file, "\n(");
|
|
print_icache_function_formal (file, 0);
|
|
lf_printf (file, ")\n");
|
|
lf_printf (file, "{\n");
|
|
lf_indent (file, +2);
|
|
lf_printf (file, "/* semantic routine */\n");
|
|
if (options.gen.semantic_icache)
|
|
{
|
|
lf_print__line_ref (file, function->code->line);
|
|
table_print_code (file, function->code);
|
|
lf_printf (file,
|
|
"error (\"Internal function must longjump\\n\");\n");
|
|
lf_printf (file, "return 0;\n");
|
|
}
|
|
else
|
|
{
|
|
lf_printf (file, "return ");
|
|
print_function_name (file,
|
|
function->name,
|
|
NULL,
|
|
NULL, NULL, function_name_prefix_semantics);
|
|
lf_printf (file, ";\n");
|
|
}
|
|
|
|
lf_print__internal_ref (file);
|
|
lf_indent (file, -2);
|
|
lf_printf (file, "}\n");
|
|
}
|
|
}
|