gen-semantics.c
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/* The IGEN simulator generator for GDB, the GNU Debugger.
Copyright 2002 Free Software Foundation, Inc.
Contributed by Andrew Cagney.
This file is part of GDB.
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 "igen.h"
#include "ld-insn.h"
#include "ld-decode.h"
#include "gen.h"
#include "gen-semantics.h"
#include "gen-icache.h"
#include "gen-idecode.h"
static void
print_semantic_function_header (lf *file,
const char *basename,
const char *format_name,
opcode_bits *expanded_bits,
int is_function_definition,
int nr_prefetched_words)
{
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,
format_name,
NULL,
expanded_bits,
function_name_prefix_semantics);
if (is_function_definition)
{
indent += lf_printf (file, " ");
lf_indent (file, +indent);
}
else
{
lf_printf (file, "\n");
}
lf_printf (file, "(");
lf_indent (file, +1);
print_semantic_function_formal (file, nr_prefetched_words);
lf_indent (file, -1);
lf_printf (file, ")");
if (is_function_definition)
{
lf_indent (file, -indent);
}
else
{
lf_printf (file, ";");
}
lf_printf (file, "\n");
}
void
print_semantic_declaration (lf *file,
insn_entry * insn,
opcode_bits *expanded_bits,
insn_opcodes *opcodes, int nr_prefetched_words)
{
print_semantic_function_header (file,
insn->name,
insn->format_name,
expanded_bits,
0 /* is not function definition */ ,
nr_prefetched_words);
}
/* generate the semantics.c file */
void
print_idecode_invalid (lf *file, const char *result, invalid_type type)
{
const char *name;
switch (type)
{
default:
name = "unknown";
break;
case invalid_illegal:
name = "illegal";
break;
case invalid_fp_unavailable:
name = "fp_unavailable";
break;
case invalid_wrong_slot:
name = "wrong_slot";
break;
}
if (options.gen.code == generate_jumps)
{
lf_printf (file, "goto %s_%s;\n",
(options.gen.icache ? "icache" : "semantic"), name);
}
else if (options.gen.icache)
{
lf_printf (file, "%s %sicache_%s (", result,
options.module.global.prefix.l, name);
print_icache_function_actual (file, 0);
lf_printf (file, ");\n");
}
else
{
lf_printf (file, "%s %ssemantic_%s (", result,
options.module.global.prefix.l, name);
print_semantic_function_actual (file, 0);
lf_printf (file, ");\n");
}
}
void
print_semantic_body (lf *file,
insn_entry * instruction,
opcode_bits *expanded_bits, insn_opcodes *opcodes)
{
/* validate the instruction, if a cache this has already been done */
if (!options.gen.icache)
{
print_idecode_validate (file, instruction, opcodes);
}
print_itrace (file, instruction, 0 /*put_value_in_cache */ );
/* generate the instruction profile call - this is delayed until
after the instruction has been verified. The count macro
generated is prefixed by ITABLE_PREFIX */
{
lf_printf (file, "\n");
lf_indent_suppress (file);
lf_printf (file, "#if defined (%sPROFILE_COUNT_INSN)\n",
options.module.itable.prefix.u);
lf_printf (file, "%sPROFILE_COUNT_INSN (CPU, CIA, MY_INDEX);\n",
options.module.itable.prefix.u);
lf_indent_suppress (file);
lf_printf (file, "#endif\n");
}
/* generate the model 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->name,
instruction->format_name,
NULL, NULL, function_name_prefix_itable);
lf_printf (file, ", cpu, cia);\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 (options.gen.nia == nia_is_invalid)
{
lf_printf (file, "nia = %sINVALID_INSTRUCTION_ADDRESS;\n",
options.module.global.prefix.u);
}
else
{
int nr_immeds = instruction->nr_words - 1;
if (options.gen.delayed_branch)
{
if (nr_immeds > 0)
{
lf_printf (file, "cia.dp += %d * %d; %s\n",
options.insn_bit_size / 8, nr_immeds,
"/* skip dp immeds */");
}
lf_printf (file, "nia.ip = cia.dp; %s\n",
"/* instruction pointer */");
lf_printf (file, "nia.dp = cia.dp + %d; %s\n",
options.insn_bit_size / 8,
"/* delayed-slot pointer */");
}
else
{
if (nr_immeds > 0)
{
lf_printf (file, "nia = cia + %d * (%d + 1); %s\n",
options.insn_bit_size / 8, nr_immeds,
"/* skip immeds as well */");
}
else
{
lf_printf (file, "nia = cia + %d;\n",
options.insn_bit_size / 8);
}
}
}
}
/* if conditional, generate code to verify that the instruction
should be issued */
if (filter_is_member (instruction->options, "c")
|| options.gen.conditional_issue)
{
lf_printf (file, "\n");
lf_printf (file, "/* execute only if conditional passes */\n");
lf_printf (file, "if (IS_CONDITION_OK)\n");
lf_printf (file, " {\n");
lf_indent (file, +4);
/* FIXME - need to log a conditional failure */
}
/* Architecture expects a REG to be zero. Instead of having to
check every read to see if it is refering to that REG just zap it
at the start of every instruction */
if (options.gen.zero_reg)
{
lf_printf (file, "\n");
lf_printf (file, "/* Architecture expects REG to be zero */\n");
lf_printf (file, "GPR_CLEAR(%d);\n", options.gen.zero_reg_nr);
}
/* generate the code (or at least something */
lf_printf (file, "\n");
lf_printf (file, "/* semantics: */\n");
if (instruction->code != NULL)
{
/* true code */
lf_printf (file, "{\n");
lf_indent (file, +2);
lf_print__line_ref (file, instruction->code->line);
table_print_code (file, instruction->code);
lf_indent (file, -2);
lf_printf (file, "}\n");
lf_print__internal_ref (file);
}
else if (filter_is_member (instruction->options, "nop"))
{
lf_print__internal_ref (file);
}
else
{
const char *prefix = "sim_engine_abort (";
int indent = strlen (prefix);
/* abort so it is implemented now */
lf_print__line_ref (file, instruction->line);
lf_printf (file, "%sSD, CPU, cia, \\\n", prefix);
lf_indent (file, +indent);
lf_printf (file, "\"%s:%d:0x%%08lx:%%s unimplemented\\n\", \\\n",
filter_filename (instruction->line->file_name),
instruction->line->line_nr);
lf_printf (file, "(long) CIA, \\\n");
lf_printf (file, "%sitable[MY_INDEX].name);\n",
options.module.itable.prefix.l);
lf_indent (file, -indent);
lf_print__internal_ref (file);
}
/* Close off the conditional execution */
if (filter_is_member (instruction->options, "c")
|| options.gen.conditional_issue)
{
lf_indent (file, -4);
lf_printf (file, " }\n");
}
}
static void
print_c_semantic (lf *file,
insn_entry * instruction,
opcode_bits *expanded_bits,
insn_opcodes *opcodes,
cache_entry *cache_rules, int nr_prefetched_words)
{
lf_printf (file, "{\n");
lf_indent (file, +2);
print_my_defines (file,
instruction->name,
instruction->format_name, expanded_bits);
lf_printf (file, "\n");
print_icache_body (file,
instruction,
expanded_bits,
cache_rules,
(options.gen.direct_access
? define_variables
: declare_variables),
(options.gen.icache
? get_values_from_icache
: do_not_use_icache), nr_prefetched_words);
lf_printf (file, "%sinstruction_address nia;\n",
options.module.global.prefix.l);
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 (options.gen.direct_access)
{
print_icache_body (file,
instruction,
expanded_bits,
cache_rules,
undef_variables,
(options.gen.icache
? get_values_from_icache
: do_not_use_icache), nr_prefetched_words);
}
lf_indent (file, -2);
lf_printf (file, "}\n");
}
static void
print_c_semantic_function (lf *file,
insn_entry * instruction,
opcode_bits *expanded_bits,
insn_opcodes *opcodes,
cache_entry *cache_rules, int nr_prefetched_words)
{
/* build the semantic routine to execute the instruction */
print_semantic_function_header (file,
instruction->name,
instruction->format_name,
expanded_bits,
1 /*is-function-definition */ ,
nr_prefetched_words);
print_c_semantic (file,
instruction,
expanded_bits, opcodes, cache_rules, nr_prefetched_words);
}
void
print_semantic_definition (lf *file,
insn_entry * insn,
opcode_bits *expanded_bits,
insn_opcodes *opcodes,
cache_entry *cache_rules, int nr_prefetched_words)
{
print_c_semantic_function (file,
insn,
expanded_bits,
opcodes, cache_rules, nr_prefetched_words);
}