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https://gitlab.com/qemu-project/qemu
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tcg: Add generic translation framework
Reviewed-by: Emilio G. Cota <cota@braap.org> Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Message-Id: <150002073981.22386.9870422422367410100.stgit@frigg.lan> [rth: Moved max_insns adjustment from tb_start to init_disas_context. Removed pc_next return from translate_insn. Removed tcg_check_temp_count from generic loop. Moved gen_io_end to exactly match gen_io_start. Use qemu_log instead of error_report for temporary leaks. Moved TB size/icount assignments before disas_log.] Signed-off-by: Richard Henderson <rth@twiddle.net>
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3805c2eba8
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@ -1,3 +1,4 @@
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obj-$(CONFIG_SOFTMMU) += tcg-all.o
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obj-$(CONFIG_SOFTMMU) += cputlb.o
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obj-y += cpu-exec.o cpu-exec-common.o translate-all.o
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obj-y += translator.o
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138
accel/tcg/translator.c
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138
accel/tcg/translator.c
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/*
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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-common.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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/* 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)
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{
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int max_insns;
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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->singlestep_enabled = cpu->singlestep_enabled;
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/* Instruction counting */
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max_insns = db->tb->cflags & CF_COUNT_MASK;
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if (max_insns == 0) {
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max_insns = CF_COUNT_MASK;
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}
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if (max_insns > TCG_MAX_INSNS) {
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max_insns = TCG_MAX_INSNS;
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}
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if (db->singlestep_enabled || singlestep) {
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max_insns = 1;
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}
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max_insns = ops->init_disas_context(db, cpu, max_insns);
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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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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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/* Pass breakpoint hits to target for further processing */
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if (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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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 == max_insns && (db->tb->cflags & 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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gen_io_end();
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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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/* 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 >= 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);
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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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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();
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}
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#endif
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}
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@ -10,6 +10,19 @@
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#ifndef EXEC__TRANSLATOR_H
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#define EXEC__TRANSLATOR_H
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/*
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* Include this header from a target-specific file, and add a
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*
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* DisasContextBase base;
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*
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* member in your target-specific DisasContext.
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*/
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#include "exec/exec-all.h"
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#include "tcg/tcg.h"
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/**
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* DisasJumpType:
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* @DISAS_NEXT: Next instruction in program order.
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DISAS_TARGET_11,
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} DisasJumpType;
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/**
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* DisasContextBase:
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* @tb: Translation block for this disassembly.
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* @pc_first: Address of first guest instruction in this TB.
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* @pc_next: Address of next guest instruction in this TB (current during
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* disassembly).
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* @is_jmp: What instruction to disassemble next.
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* @num_insns: Number of translated instructions (including current).
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* @singlestep_enabled: "Hardware" single stepping enabled.
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*
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* Architecture-agnostic disassembly context.
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*/
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typedef struct DisasContextBase {
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TranslationBlock *tb;
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target_ulong pc_first;
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target_ulong pc_next;
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DisasJumpType is_jmp;
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unsigned int num_insns;
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bool singlestep_enabled;
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} DisasContextBase;
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/**
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* TranslatorOps:
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* @init_disas_context:
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* Initialize the target-specific portions of DisasContext struct.
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* The generic DisasContextBase has already been initialized.
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* Return max_insns, modified as necessary by db->tb->flags.
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*
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* @tb_start:
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* Emit any code required before the start of the main loop,
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* after the generic gen_tb_start().
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*
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* @insn_start:
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* Emit the tcg_gen_insn_start opcode.
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*
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* @breakpoint_check:
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* When called, the breakpoint has already been checked to match the PC,
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* but the target may decide the breakpoint missed the address
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* (e.g., due to conditions encoded in their flags). Return true to
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* indicate that the breakpoint did hit, in which case no more breakpoints
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* are checked. If the breakpoint did hit, emit any code required to
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* signal the exception, and set db->is_jmp as necessary to terminate
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* the main loop.
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*
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* @translate_insn:
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* Disassemble one instruction and set db->pc_next for the start
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* of the following instruction. Set db->is_jmp as necessary to
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* terminate the main loop.
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*
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* @tb_stop:
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* Emit any opcodes required to exit the TB, based on db->is_jmp.
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*
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* @disas_log:
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* Print instruction disassembly to log.
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*/
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typedef struct TranslatorOps {
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int (*init_disas_context)(DisasContextBase *db, CPUState *cpu,
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int max_insns);
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void (*tb_start)(DisasContextBase *db, CPUState *cpu);
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void (*insn_start)(DisasContextBase *db, CPUState *cpu);
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bool (*breakpoint_check)(DisasContextBase *db, CPUState *cpu,
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const CPUBreakpoint *bp);
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void (*translate_insn)(DisasContextBase *db, CPUState *cpu);
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void (*tb_stop)(DisasContextBase *db, CPUState *cpu);
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void (*disas_log)(const DisasContextBase *db, CPUState *cpu);
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} TranslatorOps;
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/**
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* translator_loop:
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* @ops: Target-specific operations.
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* @db: Disassembly context.
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* @cpu: Target vCPU.
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* @tb: Translation block.
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*
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* Generic translator loop.
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*
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* Translation will stop in the following cases (in order):
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* - When is_jmp set by #TranslatorOps::breakpoint_check.
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* - set to DISAS_TOO_MANY exits after translating one more insn
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* - set to any other value than DISAS_NEXT exits immediately.
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* - When is_jmp set by #TranslatorOps::translate_insn.
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* - set to any value other than DISAS_NEXT exits immediately.
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* - When the TCG operation buffer is full.
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* - When single-stepping is enabled (system-wide or on the current vCPU).
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* - When too many instructions have been translated.
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*/
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void translator_loop(const TranslatorOps *ops, DisasContextBase *db,
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CPUState *cpu, TranslationBlock *tb);
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void translator_loop_temp_check(DisasContextBase *db);
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#endif /* EXEC__TRANSLATOR_H */
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