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binutils-gdb/sim/igen/gen-engine.c

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/* This file is part of the program psim.
Copyright (C) 1994-1998, 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 "igen.h"
#include "ld-insn.h"
#include "ld-decode.h"
#include "gen.h"
#include "gen-idecode.h"
#include "gen-engine.h"
#include "gen-icache.h"
#include "gen-semantics.h"
static void
print_engine_issue_prefix_hook (lf *file)
{
lf_printf (file, "\n");
lf_indent_suppress (file);
lf_printf (file, "#if defined (%sENGINE_ISSUE_PREFIX_HOOK)\n",
options.module.global.prefix.l);
lf_printf (file, "%sENGINE_ISSUE_PREFIX_HOOK();\n",
options.module.global.prefix.l);
lf_indent_suppress (file);
lf_printf (file, "#endif\n");
lf_printf (file, "\n");
}
static void
print_engine_issue_postfix_hook (lf *file)
{
lf_printf (file, "\n");
lf_indent_suppress (file);
lf_printf (file, "#if defined (%sENGINE_ISSUE_POSTFIX_HOOK)\n",
options.module.global.prefix.l);
lf_printf (file, "%sENGINE_ISSUE_POSTFIX_HOOK();\n",
options.module.global.prefix.l);
lf_indent_suppress (file);
lf_printf (file, "#endif\n");
lf_printf (file, "\n");
}
static void
print_run_body (lf *file,
gen_entry *table)
{
/* Output the function to execute real code:
Unfortunatly, there are multiple cases to consider vis:
<icache> X <smp>
Consequently this function is written in multiple different ways */
lf_printf (file, "{\n");
lf_indent (file, +2);
if (!options.gen.smp)
{
lf_printf (file, "%sinstruction_address cia;\n", options.module.global.prefix.l);
}
lf_printf (file, "int current_cpu = next_cpu_nr;\n");
if (options.gen.icache)
{
lf_printf (file, "/* flush the icache of a possible break insn */\n");
lf_printf (file, "{\n");
lf_printf (file, " int cpu_nr;\n");
lf_printf (file, " for (cpu_nr = 0; cpu_nr < nr_cpus; cpu_nr++)\n");
lf_printf (file, " cpu_flush_icache (STATE_CPU (sd, cpu_nr));\n");
lf_printf (file, "}\n");
}
if (!options.gen.smp)
{
lf_putstr (file, "
/* CASE 1: NO SMP (with or with out instruction cache).
In this case, we can take advantage of the fact that the current
instruction address (CIA) does not need to be read from / written to
the CPU object after the execution of an instruction.
Instead, CIA is only saved when the main loop exits. This occures
when either sim_engine_halt or sim_engine_restart is called. Both of
these functions save the current instruction address before halting /
restarting the simulator.
As a variation, there may also be support for an instruction cracking
cache. */
");
lf_putstr (file, "\n");
lf_putstr (file, "/* prime the main loop */\n");
lf_putstr (file, "SIM_ASSERT (current_cpu == 0);\n");
lf_putstr (file, "SIM_ASSERT (nr_cpus == 1);\n");
lf_putstr (file, "cia = CIA_GET (CPU);\n");
lf_putstr (file, "\n");
lf_putstr (file, "while (1)\n");
lf_putstr (file, " {\n");
lf_indent (file, +4);
lf_printf (file, "%sinstruction_address nia;\n",
options.module.global.prefix.l);
lf_printf (file, "\n");
if (!options.gen.icache)
{
lf_printf (file, "%sinstruction_word instruction_0 = IMEM%d (cia);\n",
options.module.global.prefix.l,
options.insn_bit_size);
print_engine_issue_prefix_hook (file);
print_idecode_body (file, table, "nia = ");
print_engine_issue_postfix_hook (file);
}
else
{
lf_putstr (file, "idecode_cache *cache_entry =\n");
lf_putstr (file, " cpu_icache_entry (cpu, cia);\n");
lf_putstr (file, "if (cache_entry->address == cia)\n");
lf_putstr (file, " {\n");
lf_indent (file, -4);
lf_putstr (file, "/* cache hit */\n");
lf_putstr (file, "idecode_semantic *const semantic = cache_entry->semantic;\n");
lf_putstr (file, "cia = semantic (cpu, cache_entry, cia);\n");
/* tail */
lf_indent (file, -4);
lf_putstr (file, " }\n");
lf_putstr (file, "else\n");
lf_putstr (file, " {\n");
lf_indent (file, +4);
lf_putstr (file, "/* cache miss */\n");
if (!options.gen.semantic_icache)
{
lf_putstr (file, "idecode_semantic *semantic;\n");
}
lf_printf (file, "instruction_word instruction = IMEM%d (cia);\n",
options.insn_bit_size);
lf_putstr (file, "if (WITH_MON != 0)\n");
lf_putstr (file, " mon_event (mon_event_icache_miss, cpu, cia);\n");
if (options.gen.semantic_icache)
{
lf_putstr (file, "{\n");
lf_indent (file, +2);
print_engine_issue_prefix_hook (file);
print_idecode_body (file, table, "nia =");
print_engine_issue_postfix_hook (file);
lf_indent (file, -2);
lf_putstr (file, "}\n");
}
else
{
print_engine_issue_prefix_hook (file);
print_idecode_body (file, table, "semantic =");
lf_putstr (file, "nia = semantic (cpu, cache_entry, cia);\n");
print_engine_issue_postfix_hook (file);
}
lf_indent (file, -4);
lf_putstr (file, " }\n");
}
/* update the cpu if necessary */
switch (options.gen.nia)
{
case nia_is_cia_plus_one:
lf_printf (file, "\n");
lf_printf (file, "/* Update the instruction address */\n");
lf_printf (file, "cia = nia;\n");
break;
case nia_is_void:
case nia_is_invalid:
ERROR ("engine gen when NIA complex");
}
/* events */
lf_putstr (file, "\n");
lf_putstr (file, "/* process any events */\n");
lf_putstr (file, "if (sim_events_tick (sd))\n");
lf_putstr (file, " {\n");
lf_putstr (file, " CIA_SET (CPU, cia);\n");
lf_putstr (file, " sim_events_process (sd);\n");
lf_putstr (file, " cia = CIA_GET (CPU);\n");
lf_putstr (file, " }\n");
lf_indent (file, -4);
lf_printf (file, " }\n");
}
if (options.gen.smp)
{
lf_putstr (file, "
/* CASE 2: SMP (With or without ICACHE)
The complexity here comes from needing to correctly halt the simulator
when it is aborted. For instance, if cpu0 requests a restart then
cpu1 will normally be the next cpu that is run. Cpu0 being restarted
after all the other CPU's and the event queue have been processed */
");
lf_putstr (file, "\n");
lf_printf (file, "/* have ensured that the event queue is NOT next */\n");
lf_printf (file, "SIM_ASSERT (current_cpu >= 0);\n");
lf_printf (file, "SIM_ASSERT (current_cpu <= nr_cpus - 1);\n");
lf_printf (file, "SIM_ASSERT (nr_cpus <= MAX_NR_PROCESSORS);\n");
lf_putstr (file, "\n");
lf_putstr (file, "while (1)\n");
lf_putstr (file, " {\n");
lf_indent (file, +4);
lf_putstr (file, "sim_cpu *cpu = STATE_CPU (sd, current_cpu);\n");
lf_putstr (file, "instruction_address cia = CIA_GET (cpu);\n");
lf_putstr (file, "\n");
if (!options.gen.icache)
{
lf_printf (file, "instruction_word instruction_0 = IMEM%d (cia);\n",
options.insn_bit_size);
print_engine_issue_prefix_hook (file);
print_idecode_body (file, table, "cia =");
lf_putstr (file, "CIA_SET (cpu, cia);\n");
print_engine_issue_postfix_hook (file);
}
if (options.gen.icache)
{
lf_putstr (file, "engine_cache *cache_entry =\n");
lf_putstr (file, " cpu_icache_entry(processor, cia);\n");
lf_putstr (file, "\n");
lf_putstr (file, "if (cache_entry->address == cia) {\n");
{
lf_indent (file, +2);
lf_putstr (file, "\n");
lf_putstr (file, "/* cache hit */\n");
lf_putstr (file, "engine_semantic *semantic = cache_entry->semantic;\n");
lf_putstr (file, "cia = semantic(processor, cache_entry, cia);\n");
/* tail */
lf_putstr (file, "cpu_set_program_counter(processor, cia);\n");
lf_putstr (file, "\n");
lf_indent (file, -2);
}
lf_putstr (file, "}\n");
lf_putstr (file, "else {\n");
{
lf_indent (file, +2);
lf_putstr (file, "\n");
lf_putstr (file, "/* cache miss */\n");
if (!options.gen.semantic_icache)
{
lf_putstr (file, "engine_semantic *semantic;\n");
}
lf_printf (file, "instruction_word instruction = IMEM%d (cia);\n",
options.insn_bit_size);
lf_putstr (file, "if (WITH_MON != 0)\n");
lf_putstr (file, " mon_event(mon_event_icache_miss, processors[current_cpu], cia);\n");
if (options.gen.semantic_icache)
{
lf_putstr (file, "{\n");
lf_indent (file, +2);
print_engine_issue_prefix_hook (file);
print_idecode_body(file, table, "cia =");
print_engine_issue_postfix_hook (file);
lf_indent (file, -2);
lf_putstr (file, "}\n");
}
else
{
print_engine_issue_prefix_hook (file);
print_idecode_body(file, table, "semantic = ");
lf_putstr (file, "cia = semantic(processor, cache_entry, cia);\n");
print_engine_issue_postfix_hook (file);
}
/* tail */
lf_putstr (file, "cpu_set_program_counter(processor, cia);\n");
lf_putstr (file, "\n");
lf_indent (file, -2);
}
lf_putstr (file, "}\n");
}
lf_putstr (file, "\n");
lf_putstr (file, "current_cpu += 1;\n");
lf_putstr (file, "if (current_cpu == nr_cpus)\n");
lf_putstr (file, " {\n");
lf_putstr (file, " if (sim_events_tick (sd))\n");
lf_putstr (file, " {\n");
lf_putstr (file, " sim_events_process (sd);\n");
lf_putstr (file, " }\n");
lf_putstr (file, " current_cpu = 0;\n");
lf_putstr (file, " }\n");
/* tail */
lf_indent (file, -4);
lf_putstr (file, " }\n");
}
lf_indent (file, -2);
lf_putstr (file, "}\n");
}
/****************************************************************/
#if 0
static void
print_jump (lf *file,
int is_tail)
{
if (!options.gen.smp)
{
lf_putstr (file, "if (event_queue_tick (sd))\n");
lf_putstr (file, " {\n");
lf_putstr (file, " CPU_CIA (processor) = nia;\n");
lf_putstr (file, " sim_events_process (sd);\n");
lf_putstr (file, " }\n");
lf_putstr (file, "}\n");
}
if (options.gen.smp)
{
if (is_tail)
lf_putstr (file, "cpu_set_program_counter(processor, nia);\n");
lf_putstr (file, "current_cpu += 1;\n");
lf_putstr (file, "if (current_cpu >= nr_cpus)\n");
lf_putstr (file, " {\n");
lf_putstr (file, " if (sim_events_tick (sd))\n");
lf_putstr (file, " {\n");
lf_putstr (file, " sim_events_process (sd);\n");
lf_putstr (file, " }\n");
lf_putstr (file, " current_cpu = 0;\n");
lf_putstr (file, " }\n");
lf_putstr (file, "processor = processors[current_cpu];\n");
lf_putstr (file, "nia = cpu_get_program_counter(processor);\n");
}
if (options.gen.icache)
{
lf_putstr (file, "cache_entry = cpu_icache_entry(processor, nia);\n");
lf_putstr (file, "if (cache_entry->address == nia) {\n");
lf_putstr (file, " /* cache hit */\n");
lf_putstr (file, " goto *cache_entry->semantic;\n");
lf_putstr (file, "}\n");
if (is_tail) {
lf_putstr (file, "goto cache_miss;\n");
}
}
if (!options.gen.icache && is_tail)
{
lf_printf (file, "goto engine;\n");
}
}
#endif
#if 0
static void
print_jump_insn (lf *file,
insn_entry *instruction,
opcode_bits *expanded_bits,
opcode_field *opcodes,
cache_entry *cache_rules)
{
insn_opcodes opcode_path;
memset (&opcode_path, 0, sizeof (opcode_path));
opcode_path.opcode = opcodes;
/* what we are for the moment */
lf_printf (file, "\n");
print_my_defines (file,
instruction->name,
instruction->format_name,
expanded_bits);
/* output the icache entry */
if (options.gen.icache)
{
lf_printf (file, "\n");
lf_indent (file, -1);
print_function_name (file,
instruction->name,
instruction->format_name,
NULL,
expanded_bits,
function_name_prefix_icache);
lf_printf (file, ":\n");
lf_indent (file, +1);
lf_printf (file, "{\n");
lf_indent (file, +2);
lf_putstr (file, "const unsigned_word cia = nia;\n");
print_itrace (file, instruction, 1/*putting-value-in-cache*/);
print_idecode_validate (file, instruction, &opcode_path);
lf_printf (file, "\n");
lf_printf (file, "{\n");
lf_indent (file, +2);
print_icache_body (file,
instruction,
expanded_bits,
cache_rules,
0, /*use_defines*/
put_values_in_icache);
lf_printf (file, "cache_entry->address = nia;\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");
if (options.gen.semantic_icache)
{
print_semantic_body (file,
instruction,
expanded_bits,
&opcode_path);
print_jump(file, 1/*is-tail*/);
}
else
{
lf_printf (file, "/* goto ");
print_function_name (file,
instruction->name,
instruction->format_name,
NULL,
expanded_bits,
function_name_prefix_semantics);
lf_printf (file, "; */\n");
}
lf_indent (file, -2);
lf_putstr (file, "}\n");
lf_indent (file, -2);
lf_printf (file, "}\n");
}
/* print the semantics */
lf_printf (file, "\n");
lf_indent (file, -1);
print_function_name (file,
instruction->name,
instruction->format_name,
NULL,
expanded_bits,
function_name_prefix_semantics);
lf_printf (file, ":\n");
lf_indent (file, +1);
lf_printf (file, "{\n");
lf_indent (file, +2);
lf_putstr (file, "const unsigned_word cia = nia;\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));
print_semantic_body (file,
instruction,
expanded_bits,
&opcode_path);
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));
print_jump(file, 1/*is tail*/);
lf_indent (file, -2);
lf_printf (file, "}\n");
}
#endif
#if 0
static void
print_jump_definition (lf *file,
gen_entry *entry,
int depth,
void *data)
{
cache_entry *cache_rules = (cache_entry*)data;
if (entry->opcode_rule->with_duplicates)
{
ASSERT (entry->nr_insns == 1
&& entry->opcode == NULL
&& entry->parent != NULL
&& entry->parent->opcode != NULL);
ASSERT (entry->nr_insns == 1
&& entry->opcode == NULL
&& entry->parent != NULL
&& entry->parent->opcode != NULL
&& entry->parent->opcode_rule != NULL);
print_jump_insn (file,
entry->insns->insn,
entry->expanded_bits,
entry->opcode,
cache_rules);
}
else
{
print_jump_insn (file,
entry->insns->insn,
NULL,
NULL,
cache_rules);
}
}
#endif
#if 0
static void
print_jump_internal_function (lf *file,
function_entry *function,
void *data)
{
if (function->is_internal)
{
lf_printf (file, "\n");
lf_print__line_ref (file, function->line);
lf_indent (file, -1);
print_function_name (file,
function->name,
NULL,
NULL,
NULL,
(options.gen.icache
? function_name_prefix_icache
: function_name_prefix_semantics));
lf_printf (file, ":\n");
lf_indent (file, +1);
lf_printf (file, "{\n");
lf_indent (file, +2);
lf_printf (file, "const unsigned_word cia = nia;\n");
table_print_code (file, function->code);
lf_print__internal_ref (file);
lf_printf (file, "error(\"Internal function must longjump\\n\");\n");
lf_indent (file, -2);
lf_printf (file, "}\n");
}
}
#endif
#if 0
static void
print_jump_body (lf *file,
gen_entry *entry,
insn_table *isa,
cache_entry *cache_rules)
{
lf_printf (file, "{\n");
lf_indent (file, +2);
lf_putstr (file, "jmp_buf halt;\n");
lf_putstr (file, "jmp_buf restart;\n");
lf_putstr (file, "cpu *processor = NULL;\n");
lf_putstr (file, "unsigned_word nia = -1;\n");
lf_putstr (file, "instruction_word instruction = 0;\n");
if (options.gen.icache)
{
lf_putstr (file, "engine_cache *cache_entry = NULL;\n");
}
if (options.gen.smp)
{
lf_putstr (file, "int current_cpu = -1;\n");
}
/* all the switches and tables - they know about jumping */
print_idecode_lookups (file, entry, cache_rules);
/* start the simulation up */
if (options.gen.icache)
{
lf_putstr (file, "\n");
lf_putstr (file, "{\n");
lf_putstr (file, " int cpu_nr;\n");
lf_putstr (file, " for (cpu_nr = 0; cpu_nr < nr_cpus; cpu_nr++)\n");
lf_putstr (file, " cpu_flush_icache(processors[cpu_nr]);\n");
lf_putstr (file, "}\n");
}
lf_putstr (file, "\n");
lf_putstr (file, "psim_set_halt_and_restart(system, &halt, &restart);\n");
lf_putstr (file, "\n");
lf_putstr (file, "if (setjmp(halt))\n");
lf_putstr (file, " return;\n");
lf_putstr (file, "\n");
lf_putstr (file, "setjmp(restart);\n");
lf_putstr (file, "\n");
if (!options.gen.smp)
{
lf_putstr (file, "processor = processors[0];\n");
lf_putstr (file, "nia = cpu_get_program_counter(processor);\n");
}
else
{
lf_putstr (file, "current_cpu = psim_last_cpu(system);\n");
}
if (!options.gen.icache)
{
lf_printf (file, "\n");
lf_indent (file, -1);
lf_printf (file, "engine:\n");
lf_indent (file, +1);
}
print_jump(file, 0/*is_tail*/);
if (options.gen.icache)
{
lf_indent (file, -1);
lf_printf (file, "cache_miss:\n");
lf_indent (file, +1);
}
print_engine_issue_prefix_hook (file);
lf_putstr (file, "instruction\n");
lf_putstr (file, " = vm_instruction_map_read(cpu_instruction_map(processor),\n");
lf_putstr (file, " processor, nia);\n");
print_engine_issue_prefix_hook (file);
print_idecode_body (file, entry, "/*IGORE*/");
print_engine_issue_postfix_hook (file);
/* print out a table of all the internals functions */
function_entry_traverse (file, isa->functions,
print_jump_internal_function,
NULL);
/* print out a table of all the instructions */
ERROR ("Use the list of semantic functions, not travere_tree");
gen_entry_traverse_tree (file, entry,
1,
NULL, /* start */
print_jump_definition, /* leaf */
NULL, /* end */
cache_rules);
lf_indent (file, -2);
lf_printf (file, "}\n");
}
#endif
/****************************************************************/
void
print_engine_run_function_header (lf *file,
char *processor,
function_decl_type decl_type)
{
int indent;
lf_printf (file, "\n");
switch (decl_type)
{
case is_function_declaration:
lf_print__function_type (file, "void", "INLINE_ENGINE", "\n");
break;
case is_function_definition:
lf_print__function_type (file, "void", "INLINE_ENGINE", " ");
break;
case is_function_variable:
lf_printf (file, "void (*");
break;
}
indent = print_function_name (file,
"run",
NULL, /* format name */
processor,
NULL, /* expanded bits */
function_name_prefix_engine);
switch (decl_type)
{
case is_function_definition:
lf_putstr (file, "\n(");
indent = 1;
break;
case is_function_declaration:
indent += lf_printf (file, " (");
break;
case is_function_variable:
lf_putstr (file, ")\n(");
indent = 1;
break;
}
lf_indent (file, +indent);
lf_printf (file, "SIM_DESC sd,\n");
lf_printf (file, "int next_cpu_nr,\n");
lf_printf (file, "int nr_cpus,\n");
lf_printf (file, "int siggnal)");
lf_indent (file, -indent);
switch (decl_type)
{
case is_function_definition:
lf_putstr (file, "\n");
break;
case is_function_variable:
case is_function_declaration:
lf_putstr (file, ";\n");
break;
}
}
void
gen_engine_h (lf *file,
gen_table *gen,
insn_table *isa,
cache_entry *cache_rules)
{
gen_list *entry;
for (entry = gen->tables; entry != NULL; entry = entry->next)
{
print_engine_run_function_header (file,
(options.gen.multi_sim
? entry->model->name
: NULL),
is_function_declaration);
}
}
void
gen_engine_c(lf *file,
gen_table *gen,
insn_table *isa,
cache_entry *cache_rules)
{
gen_list *entry;
/* the intro */
print_includes (file);
print_include_inline (file, options.module.semantics);
print_include (file, options.module.engine);
lf_printf (file, "\n");
lf_printf (file, "#include \"sim-assert.h\"\n");
lf_printf (file, "\n");
print_idecode_globals (file);
lf_printf (file, "\n");
for (entry = gen->tables; entry != NULL; entry = entry->next)
{
switch (options.gen.code)
{
case generate_calls:
print_idecode_lookups (file, entry->table, cache_rules);
/* output the main engine routine */
print_engine_run_function_header (file,
(options.gen.multi_sim
? entry->model->name
: NULL),
is_function_definition);
print_run_body (file, entry->table);
break;
case generate_jumps:
ERROR ("Jumps currently unimplemented");
#if 0
print_engine_run_function_header (file,
entry->processor,
is_function_definition);
print_jump_body (file, entry->table,
isa, cache_rules);
#endif
break;
}
}
}
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