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-rw-r--r--sim/igen/gen-semantics.c303
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diff --git a/sim/igen/gen-semantics.c b/sim/igen/gen-semantics.c
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+/* This file is part of the program psim.
+
+ Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+ */
+
+
+
+#include "misc.h"
+#include "lf.h"
+#include "table.h"
+#include "filter.h"
+
+#include "ld-decode.h"
+#include "ld-cache.h"
+#include "ld-insn.h"
+
+#include "igen.h"
+
+#include "gen-semantics.h"
+#include "gen-icache.h"
+#include "gen-idecode.h"
+
+
+static void
+print_semantic_function_header(lf *file,
+ const char *basename,
+ insn_bits *expanded_bits,
+ int is_function_definition)
+{
+ int indent;
+ lf_printf(file, "\n");
+ lf_print_function_type_function(file, print_semantic_function_type, "EXTERN_SEMANTICS",
+ (is_function_definition ? "\n" : " "));
+ indent = print_function_name(file,
+ basename,
+ expanded_bits,
+ function_name_prefix_semantics);
+ if (is_function_definition)
+ lf_indent(file, +indent);
+ else
+ lf_printf(file, "\n");
+ lf_printf(file, "(");
+ print_semantic_function_formal(file);
+ lf_printf(file, ")");
+ if (is_function_definition)
+ lf_indent(file, -indent);
+ else
+ lf_printf(file, ";");
+ lf_printf(file, "\n");
+}
+
+void
+print_semantic_declaration(insn_table *entry,
+ lf *file,
+ void *data,
+ insn *instruction,
+ int depth)
+{
+ if (generate_expanded_instructions) {
+ ASSERT(entry->nr_insn == 1);
+ print_semantic_function_header(file,
+ instruction->file_entry->fields[insn_name],
+ entry->expanded_bits,
+ 0/* is not function definition*/);
+ }
+ else {
+ print_semantic_function_header(file,
+ instruction->file_entry->fields[insn_name],
+ NULL,
+ 0/* is not function definition*/);
+ }
+}
+
+
+
+/* generate the semantics.c file */
+
+
+void
+print_idecode_invalid(lf *file,
+ const char *result,
+ invalid_type type)
+{
+ const char *name;
+ switch (type) {
+ case invalid_illegal: name = "illegal"; break;
+ case invalid_fp_unavailable: name = "fp_unavailable"; break;
+ case invalid_wrong_slot: name = "wrong_slot"; break;
+ }
+ if ((code & generate_jumps))
+ lf_printf(file, "goto %s_%s;\n",
+ (code & generate_with_icache) ? "icache" : "semantic",
+ name);
+ else if ((code & generate_with_icache)) {
+ lf_printf(file, "%s %sicache_%s(", result, global_name_prefix, name);
+ print_icache_function_actual(file);
+ lf_printf(file, ");\n");
+ }
+ else {
+ lf_printf(file, "%s %ssemantic_%s(", result, global_name_prefix, name);
+ print_semantic_function_actual(file);
+ lf_printf(file, ");\n");
+ }
+}
+
+
+void
+print_semantic_body(lf *file,
+ insn *instruction,
+ insn_bits *expanded_bits,
+ opcode_field *opcodes)
+{
+ print_itrace(file, instruction->file_entry, 0/*put_value_in_cache*/);
+
+ /* validate the instruction, if a cache this has already been done */
+ if (!(code & generate_with_icache))
+ print_idecode_validate(file, instruction, opcodes);
+
+ /* generate the profiling call - this is delayed until after the
+ instruction has been verified */
+ lf_printf(file, "\n");
+ lf_indent_suppress(file);
+ lf_printf(file, "#if defined(WITH_MON)\n");
+ lf_printf(file, "/* monitoring: */\n");
+ lf_printf(file, "if (WITH_MON & MONITOR_INSTRUCTION_ISSUE) {\n");
+ lf_printf(file, " mon_issue(");
+ print_function_name(file,
+ instruction->file_entry->fields[insn_name],
+ NULL,
+ function_name_prefix_itable);
+ lf_printf(file, ", cpu, cia);\n");
+ lf_printf(file, "}\n");
+ lf_indent_suppress(file);
+ lf_printf(file, "#endif\n");
+ lf_printf(file, "\n");
+
+ /* determine the new instruction address */
+ lf_printf(file, "/* keep the next instruction address handy */\n");
+ if ((code & generate_with_semantic_returning_modified_nia_only))
+ lf_printf(file, "nia = -1;\n");
+ else if ((code & generate_with_semantic_delayed_branch)) {
+ lf_printf(file, "nia.ip = cia.dp; /* instruction pointer */\n");
+ lf_printf(file, "nia.dp = cia.dp + %d; /* delayed-slot pointer\n",
+ insn_bit_size / 8);
+ }
+ else
+ lf_printf(file, "nia = cia + %d;\n", insn_bit_size / 8);
+
+ /* if conditional, generate code to verify that the instruction
+ should be issued */
+ if (it_is("c", instruction->file_entry->fields[insn_options])
+ || (code & generate_with_semantic_conditional_issue)) {
+ lf_printf(file, "\n");
+ lf_printf(file, "/* execute only if conditional passes */\n");
+ lf_printf(file, "if (IS_CONDITION_OK) {\n");
+ lf_indent(file, +2);
+ /* FIXME - need to log a conditional failure */
+ }
+
+ /* generate the code (or at least something */
+ lf_printf(file, "\n");
+ lf_printf(file, "/* semantics: */\n");
+ if (instruction->file_entry->annex != NULL) {
+ /* true code */
+ table_entry_print_cpp_line_nr(file, instruction->file_entry);
+ lf_printf(file, "{\n");
+ lf_indent(file, +2);
+ lf_print__c_code(file, instruction->file_entry->annex);
+ lf_indent(file, -2);
+ lf_printf(file, "}\n");
+ lf_print__internal_reference(file);
+ }
+ else if (it_is("nop", instruction->file_entry->fields[insn_flags])) {
+ lf_print__internal_reference(file);
+ }
+ else {
+ /* abort so it is implemented now */
+ table_entry_print_cpp_line_nr(file, instruction->file_entry);
+ lf_printf(file, "engine_error(system, \"%s:%d:0x%%08lx:%%s unimplemented\\n\",\n",
+ filter_filename(instruction->file_entry->file_name),
+ instruction->file_entry->line_nr);
+ lf_printf(file, " (long)cia, itable[MY_INDEX].name);\n");
+ lf_print__internal_reference(file);
+ }
+
+ /* Close off the conditional execution */
+ if (it_is("c", instruction->file_entry->fields[insn_options])
+ || (code & generate_with_semantic_conditional_issue)) {
+ lf_indent(file, -2);
+ lf_printf(file, "}\n");
+ }
+}
+
+static void
+print_c_semantic(lf *file,
+ insn *instruction,
+ insn_bits *expanded_bits,
+ opcode_field *opcodes,
+ cache_table *cache_rules)
+{
+
+ lf_printf(file, "{\n");
+ lf_indent(file, +2);
+
+ print_my_defines(file, expanded_bits, instruction->file_entry);
+ lf_printf(file, "\n");
+ print_icache_body(file,
+ instruction,
+ expanded_bits,
+ cache_rules,
+ ((code & generate_with_direct_access)
+ ? define_variables
+ : declare_variables),
+ ((code & generate_with_icache)
+ ? get_values_from_icache
+ : do_not_use_icache));
+
+ lf_printf(file, "instruction_address nia;\n");
+ print_semantic_body(file,
+ instruction,
+ expanded_bits,
+ opcodes);
+ lf_printf(file, "return nia;\n");
+
+ /* generate something to clean up any #defines created for the cache */
+ if (code & generate_with_direct_access)
+ print_icache_body(file,
+ instruction,
+ expanded_bits,
+ cache_rules,
+ undef_variables,
+ ((code & generate_with_icache)
+ ? get_values_from_icache
+ : do_not_use_icache));
+
+ lf_indent(file, -2);
+ lf_printf(file, "}\n");
+}
+
+static void
+print_c_semantic_function(lf *file,
+ insn *instruction,
+ insn_bits *expanded_bits,
+ opcode_field *opcodes,
+ cache_table *cache_rules)
+{
+ /* build the semantic routine to execute the instruction */
+ print_semantic_function_header(file,
+ instruction->file_entry->fields[insn_name],
+ expanded_bits,
+ 1/*is-function-definition*/);
+ print_c_semantic(file,
+ instruction,
+ expanded_bits,
+ opcodes,
+ cache_rules);
+}
+
+void
+print_semantic_definition(insn_table *entry,
+ lf *file,
+ void *data,
+ insn *instruction,
+ int depth)
+{
+ cache_table *cache_rules = (cache_table*)data;
+ if (generate_expanded_instructions) {
+ ASSERT(entry->nr_insn == 1
+ && entry->opcode == NULL
+ && entry->parent != NULL
+ && entry->parent->opcode != NULL);
+ ASSERT(entry->nr_insn == 1
+ && entry->opcode == NULL
+ && entry->parent != NULL
+ && entry->parent->opcode != NULL
+ && entry->parent->opcode_rule != NULL);
+ print_c_semantic_function(file,
+ entry->insns,
+ entry->expanded_bits,
+ entry->parent->opcode,
+ cache_rules);
+ }
+ else {
+ print_c_semantic_function(file, instruction,
+ NULL, NULL,
+ cache_rules);
+ }
+}
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