mirror of https://gitee.com/openkylin/qemu.git
149 lines
4.7 KiB
C
149 lines
4.7 KiB
C
/*
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* Generic intermediate code generation.
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*
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* Copyright (C) 2016-2017 Lluís Vilanova <vilanova@ac.upc.edu>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu/error-report.h"
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#include "cpu.h"
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#include "tcg/tcg.h"
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#include "tcg/tcg-op.h"
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#include "exec/exec-all.h"
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#include "exec/gen-icount.h"
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#include "exec/log.h"
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#include "exec/translator.h"
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#include "exec/plugin-gen.h"
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/* Pairs with tcg_clear_temp_count.
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To be called by #TranslatorOps.{translate_insn,tb_stop} if
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(1) the target is sufficiently clean to support reporting,
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(2) as and when all temporaries are known to be consumed.
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For most targets, (2) is at the end of translate_insn. */
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void translator_loop_temp_check(DisasContextBase *db)
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{
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if (tcg_check_temp_count()) {
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qemu_log("warning: TCG temporary leaks before "
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TARGET_FMT_lx "\n", db->pc_next);
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}
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}
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void translator_loop(const TranslatorOps *ops, DisasContextBase *db,
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CPUState *cpu, TranslationBlock *tb, int max_insns)
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{
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int bp_insn = 0;
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bool plugin_enabled;
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/* Initialize DisasContext */
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db->tb = tb;
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db->pc_first = tb->pc;
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db->pc_next = db->pc_first;
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db->is_jmp = DISAS_NEXT;
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db->num_insns = 0;
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db->max_insns = max_insns;
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db->singlestep_enabled = cpu->singlestep_enabled;
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ops->init_disas_context(db, cpu);
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tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */
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/* Reset the temp count so that we can identify leaks */
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tcg_clear_temp_count();
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/* Start translating. */
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gen_tb_start(db->tb);
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ops->tb_start(db, cpu);
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tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */
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plugin_enabled = plugin_gen_tb_start(cpu, tb);
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while (true) {
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db->num_insns++;
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ops->insn_start(db, cpu);
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tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */
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if (plugin_enabled) {
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plugin_gen_insn_start(cpu, db);
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}
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/* Pass breakpoint hits to target for further processing */
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if (!db->singlestep_enabled
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&& unlikely(!QTAILQ_EMPTY(&cpu->breakpoints))) {
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CPUBreakpoint *bp;
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QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
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if (bp->pc == db->pc_next) {
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if (ops->breakpoint_check(db, cpu, bp)) {
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bp_insn = 1;
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break;
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}
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}
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}
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/* The breakpoint_check hook may use DISAS_TOO_MANY to indicate
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that only one more instruction is to be executed. Otherwise
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it should use DISAS_NORETURN when generating an exception,
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but may use a DISAS_TARGET_* value for Something Else. */
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if (db->is_jmp > DISAS_TOO_MANY) {
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break;
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}
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}
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/* Disassemble one instruction. The translate_insn hook should
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update db->pc_next and db->is_jmp to indicate what should be
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done next -- either exiting this loop or locate the start of
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the next instruction. */
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if (db->num_insns == db->max_insns
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&& (tb_cflags(db->tb) & CF_LAST_IO)) {
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/* Accept I/O on the last instruction. */
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gen_io_start();
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ops->translate_insn(db, cpu);
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} else {
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ops->translate_insn(db, cpu);
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}
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/* Stop translation if translate_insn so indicated. */
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if (db->is_jmp != DISAS_NEXT) {
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break;
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}
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/*
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* We can't instrument after instructions that change control
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* flow although this only really affects post-load operations.
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*/
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if (plugin_enabled) {
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plugin_gen_insn_end();
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}
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/* Stop translation if the output buffer is full,
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or we have executed all of the allowed instructions. */
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if (tcg_op_buf_full() || db->num_insns >= db->max_insns) {
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db->is_jmp = DISAS_TOO_MANY;
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break;
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}
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}
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/* Emit code to exit the TB, as indicated by db->is_jmp. */
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ops->tb_stop(db, cpu);
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gen_tb_end(db->tb, db->num_insns - bp_insn);
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if (plugin_enabled) {
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plugin_gen_tb_end(cpu);
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}
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/* The disas_log hook may use these values rather than recompute. */
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db->tb->size = db->pc_next - db->pc_first;
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db->tb->icount = db->num_insns;
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#ifdef DEBUG_DISAS
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if (qemu_loglevel_mask(CPU_LOG_TB_IN_ASM)
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&& qemu_log_in_addr_range(db->pc_first)) {
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FILE *logfile = qemu_log_lock();
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qemu_log("----------------\n");
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ops->disas_log(db, cpu);
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qemu_log("\n");
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qemu_log_unlock(logfile);
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}
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#endif
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}
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