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/*
* Host code generation
*
* Copyright (c) 2003 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include "config.h"
#define NO_CPU_IO_DEFS
#include "cpu.h"
#include "exec-all.h"
#include "disas.h"
#include "tcg.h"
#include "qemu-timer.h"
/* code generation context */
TCGContext tcg_ctx;
uint16_t gen_opc_buf[OPC_BUF_SIZE];
TCGArg gen_opparam_buf[OPPARAM_BUF_SIZE];
target_ulong gen_opc_pc[OPC_BUF_SIZE];
uint16_t gen_opc_icount[OPC_BUF_SIZE];
uint8_t gen_opc_instr_start[OPC_BUF_SIZE];
void cpu_gen_init(void)
{
tcg_context_init(&tcg_ctx);
tcg_set_frame(&tcg_ctx, TCG_AREG0, offsetof(CPUState, temp_buf),
CPU_TEMP_BUF_NLONGS * sizeof(long));
}
/* return non zero if the very first instruction is invalid so that
the virtual CPU can trigger an exception.
'*gen_code_size_ptr' contains the size of the generated code (host
code).
*/
int cpu_gen_code(CPUState *env, TranslationBlock *tb, int *gen_code_size_ptr)
{
TCGContext *s = &tcg_ctx;
uint8_t *gen_code_buf;
int gen_code_size;
#ifdef CONFIG_PROFILER
int64_t ti;
#endif
#ifdef CONFIG_PROFILER
s->tb_count1++; /* includes aborted translations because of
exceptions */
ti = profile_getclock();
#endif
tcg_func_start(s);
gen_intermediate_code(env, tb);
/* generate machine code */
gen_code_buf = tb->tc_ptr;
tb->tb_next_offset[0] = 0xffff;
tb->tb_next_offset[1] = 0xffff;
s->tb_next_offset = tb->tb_next_offset;
#ifdef USE_DIRECT_JUMP
s->tb_jmp_offset = tb->tb_jmp_offset;
s->tb_next = NULL;
#else
s->tb_jmp_offset = NULL;
s->tb_next = tb->tb_next;
#endif
#ifdef CONFIG_PROFILER
s->tb_count++;
s->interm_time += profile_getclock() - ti;
s->code_time -= profile_getclock();
#endif
gen_code_size = tcg_gen_code(s, gen_code_buf);
*gen_code_size_ptr = gen_code_size;
#ifdef CONFIG_PROFILER
s->code_time += profile_getclock();
s->code_in_len += tb->size;
s->code_out_len += gen_code_size;
#endif
#ifdef DEBUG_DISAS
if (qemu_loglevel_mask(CPU_LOG_TB_OUT_ASM)) {
qemu_log("OUT: [size=%d]\n", *gen_code_size_ptr);
log_disas(tb->tc_ptr, *gen_code_size_ptr);
qemu_log("\n");
qemu_log_flush();
}
#endif
return 0;
}
/* The cpu state corresponding to 'searched_pc' is restored.
*/
int cpu_restore_state(TranslationBlock *tb,
CPUState *env, unsigned long searched_pc)
{
TCGContext *s = &tcg_ctx;
int j;
unsigned long tc_ptr;
#ifdef CONFIG_PROFILER
int64_t ti;
#endif
#ifdef CONFIG_PROFILER
ti = profile_getclock();
#endif
tcg_func_start(s);
gen_intermediate_code_pc(env, tb);
if (use_icount) {
/* Reset the cycle counter to the start of the block. */
env->icount_decr.u16.low += tb->icount;
/* Clear the IO flag. */
env->can_do_io = 0;
}
/* find opc index corresponding to search_pc */
tc_ptr = (unsigned long)tb->tc_ptr;
if (searched_pc < tc_ptr)
return -1;
s->tb_next_offset = tb->tb_next_offset;
#ifdef USE_DIRECT_JUMP
s->tb_jmp_offset = tb->tb_jmp_offset;
s->tb_next = NULL;
#else
s->tb_jmp_offset = NULL;
s->tb_next = tb->tb_next;
#endif
j = tcg_gen_code_search_pc(s, (uint8_t *)tc_ptr, searched_pc - tc_ptr);
if (j < 0)
return -1;
/* now find start of instruction before */
while (gen_opc_instr_start[j] == 0)
j--;
env->icount_decr.u16.low -= gen_opc_icount[j];
restore_state_to_opc(env, tb, j);
#ifdef CONFIG_PROFILER
s->restore_time += profile_getclock() - ti;
s->restore_count++;
#endif
return 0;
}
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