37a684b84d
o Have igen always zero r0 instead of constantly checking if the designated register is r0.
317 lines
9.1 KiB
C
317 lines
9.1 KiB
C
/* This file is part of the program psim.
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Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
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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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*/
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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 "ld-decode.h"
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#include "ld-cache.h"
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#include "ld-insn.h"
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#include "igen.h"
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#include "gen-semantics.h"
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#include "gen-icache.h"
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#include "gen-idecode.h"
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static void
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print_semantic_function_header(lf *file,
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const char *basename,
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insn_bits *expanded_bits,
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int is_function_definition)
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{
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int indent;
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lf_printf(file, "\n");
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lf_print_function_type_function(file, print_semantic_function_type, "EXTERN_SEMANTICS",
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(is_function_definition ? "\n" : " "));
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indent = print_function_name(file,
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basename,
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expanded_bits,
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function_name_prefix_semantics);
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if (is_function_definition)
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lf_indent(file, +indent);
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else
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lf_printf(file, "\n");
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lf_printf(file, "(");
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print_semantic_function_formal(file);
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lf_printf(file, ")");
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if (is_function_definition)
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lf_indent(file, -indent);
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else
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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_semantic_declaration(insn_table *entry,
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lf *file,
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void *data,
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insn *instruction,
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int depth)
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{
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if (generate_expanded_instructions) {
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ASSERT(entry->nr_insn == 1);
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print_semantic_function_header(file,
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instruction->file_entry->fields[insn_name],
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entry->expanded_bits,
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0/* is not function definition*/);
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}
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else {
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print_semantic_function_header(file,
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instruction->file_entry->fields[insn_name],
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NULL,
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0/* is not function definition*/);
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}
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}
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/* generate the semantics.c file */
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void
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print_idecode_invalid(lf *file,
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const char *result,
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invalid_type type)
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{
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const char *name;
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switch (type) {
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default: name = "unknown"; break;
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case invalid_illegal: name = "illegal"; break;
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case invalid_fp_unavailable: name = "fp_unavailable"; break;
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case invalid_wrong_slot: name = "wrong_slot"; break;
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}
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if ((code & generate_jumps))
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lf_printf(file, "goto %s_%s;\n",
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(code & generate_with_icache) ? "icache" : "semantic",
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name);
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else if ((code & generate_with_icache)) {
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lf_printf(file, "%s %sicache_%s(", result, global_name_prefix, name);
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print_icache_function_actual(file);
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lf_printf(file, ");\n");
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}
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else {
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lf_printf(file, "%s %ssemantic_%s(", result, global_name_prefix, name);
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print_semantic_function_actual(file);
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lf_printf(file, ");\n");
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}
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}
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void
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print_semantic_body(lf *file,
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insn *instruction,
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insn_bits *expanded_bits,
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opcode_field *opcodes)
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{
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print_itrace(file, instruction->file_entry, 0/*put_value_in_cache*/);
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/* validate the instruction, if a cache this has already been done */
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if (!(code & generate_with_icache))
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print_idecode_validate(file, instruction, opcodes);
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/* generate the profiling call - this is delayed until after the
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instruction has been verified */
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lf_printf(file, "\n");
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lf_indent_suppress(file);
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lf_printf(file, "#if defined(WITH_MON)\n");
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lf_printf(file, "/* monitoring: */\n");
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lf_printf(file, "if (WITH_MON & MONITOR_INSTRUCTION_ISSUE) {\n");
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lf_printf(file, " mon_issue(");
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print_function_name(file,
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instruction->file_entry->fields[insn_name],
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NULL,
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function_name_prefix_itable);
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lf_printf(file, ", cpu, cia);\n");
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lf_printf(file, "}\n");
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lf_indent_suppress(file);
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lf_printf(file, "#endif\n");
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lf_printf(file, "\n");
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/* determine the new instruction address */
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lf_printf(file, "/* keep the next instruction address handy */\n");
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if ((code & generate_with_semantic_returning_modified_nia_only))
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lf_printf(file, "nia = -1;\n");
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else if ((code & generate_with_semantic_delayed_branch)) {
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lf_printf(file, "nia.ip = cia.dp; /* instruction pointer */\n");
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lf_printf(file, "nia.dp = cia.dp + %d; /* delayed-slot pointer */\n",
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insn_bit_size / 8);
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}
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else
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lf_printf(file, "nia = cia + %d;\n", insn_bit_size / 8);
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/* if conditional, generate code to verify that the instruction
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should be issued */
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if (it_is("c", instruction->file_entry->fields[insn_options])
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|| (code & generate_with_semantic_conditional_issue)) {
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lf_printf(file, "\n");
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lf_printf(file, "/* execute only if conditional passes */\n");
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lf_printf(file, "if (IS_CONDITION_OK) {\n");
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lf_indent(file, +2);
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/* FIXME - need to log a conditional failure */
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}
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/* Architecture expects r0 to be zero. Instead of having to check
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every read to see if it is refering to r0 just zap the r0
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register */
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if ((code & generate_with_semantic_delayed_branch))
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{
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lf_printf (file, "\n");
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lf_printf (file, "GPR(0) = 0;\n");
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}
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/* generate the code (or at least something */
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lf_printf(file, "\n");
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lf_printf(file, "/* semantics: */\n");
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if (instruction->file_entry->annex != NULL) {
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/* true code */
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table_entry_print_cpp_line_nr(file, instruction->file_entry);
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lf_printf(file, "{\n");
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lf_indent(file, +2);
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lf_print__c_code(file, instruction->file_entry->annex);
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lf_indent(file, -2);
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lf_printf(file, "}\n");
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lf_print__internal_reference(file);
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}
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else if (it_is("nop", instruction->file_entry->fields[insn_flags])) {
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lf_print__internal_reference(file);
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}
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else {
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/* abort so it is implemented now */
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table_entry_print_cpp_line_nr(file, instruction->file_entry);
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lf_printf(file, "engine_error (SD, CPU, cia, \"%s:%d:0x%%08lx:%%s unimplemented\\n\",\n",
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filter_filename(instruction->file_entry->file_name),
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instruction->file_entry->line_nr);
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if ((code & generate_with_semantic_delayed_branch))
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lf_printf(file, " (long)cia.ip,\n");
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else
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lf_printf(file, " (long)cia,\n");
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lf_printf(file, " itable[MY_INDEX].name);\n");
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lf_print__internal_reference(file);
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}
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/* Close off the conditional execution */
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if (it_is("c", instruction->file_entry->fields[insn_options])
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|| (code & generate_with_semantic_conditional_issue)) {
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lf_indent(file, -2);
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lf_printf(file, "}\n");
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}
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}
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static void
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print_c_semantic(lf *file,
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insn *instruction,
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insn_bits *expanded_bits,
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opcode_field *opcodes,
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cache_table *cache_rules)
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{
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lf_printf(file, "{\n");
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lf_indent(file, +2);
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print_my_defines(file, expanded_bits, instruction->file_entry);
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lf_printf(file, "\n");
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print_icache_body(file,
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instruction,
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expanded_bits,
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cache_rules,
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((code & generate_with_direct_access)
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? define_variables
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: declare_variables),
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((code & generate_with_icache)
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? get_values_from_icache
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: do_not_use_icache));
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lf_printf(file, "%sinstruction_address nia;\n", global_name_prefix);
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print_semantic_body(file,
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instruction,
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expanded_bits,
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opcodes);
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lf_printf(file, "return nia;\n");
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/* generate something to clean up any #defines created for the cache */
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if (code & generate_with_direct_access)
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print_icache_body(file,
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instruction,
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expanded_bits,
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cache_rules,
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undef_variables,
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((code & generate_with_icache)
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? get_values_from_icache
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: do_not_use_icache));
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lf_indent(file, -2);
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lf_printf(file, "}\n");
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}
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static void
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print_c_semantic_function(lf *file,
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insn *instruction,
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insn_bits *expanded_bits,
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opcode_field *opcodes,
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cache_table *cache_rules)
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{
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/* build the semantic routine to execute the instruction */
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print_semantic_function_header(file,
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instruction->file_entry->fields[insn_name],
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expanded_bits,
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1/*is-function-definition*/);
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print_c_semantic(file,
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instruction,
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expanded_bits,
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opcodes,
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cache_rules);
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}
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void
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print_semantic_definition(insn_table *entry,
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lf *file,
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void *data,
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insn *instruction,
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int depth)
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{
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cache_table *cache_rules = (cache_table*)data;
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if (generate_expanded_instructions) {
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ASSERT(entry->nr_insn == 1
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&& entry->opcode == NULL
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&& entry->parent != NULL
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&& entry->parent->opcode != NULL);
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ASSERT(entry->nr_insn == 1
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&& entry->opcode == NULL
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&& entry->parent != NULL
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&& entry->parent->opcode != NULL
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&& entry->parent->opcode_rule != NULL);
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print_c_semantic_function(file,
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entry->insns,
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entry->expanded_bits,
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entry->parent->opcode,
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cache_rules);
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}
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else {
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print_c_semantic_function(file, instruction,
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NULL, NULL,
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cache_rules);
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}
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}
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