2021-10-03 17:14:44 +03:00
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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 "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/translator.h"
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#include <uc_priv.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 0
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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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#endif
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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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struct uc_struct *uc = (struct uc_struct *)cpu->uc;
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TCGContext *tcg_ctx = uc->tcg_ctx;
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TCGOp *prev_op = NULL;
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bool block_hook = false;
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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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/* Unicorn: early check to see if the address of this block is
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* the "run until" address. */
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2021-11-01 02:39:36 +03:00
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if (uc_addr_is_exit(uc, tb->pc)) {
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2021-10-03 17:14:44 +03:00
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// This should catch that instruction is at the end
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// and generate appropriate halting code.
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gen_tb_start(tcg_ctx, db->tb);
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ops->tb_start(db, cpu);
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db->num_insns++;
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ops->insn_start(db, cpu);
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ops->translate_insn(db, cpu);
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goto _end_loop;
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}
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/* Unicorn: trace this block on request
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* Only hook this block if it is not broken from previous translation due to
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* full translation cache
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*/
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if (HOOK_EXISTS_BOUNDED(uc, UC_HOOK_BLOCK, tb->pc)) {
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prev_op = tcg_last_op(tcg_ctx);
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block_hook = true;
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gen_uc_tracecode(tcg_ctx, 0xf8f8f8f8, UC_HOOK_BLOCK_IDX, uc, db->pc_first);
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}
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// tcg_dump_ops(tcg_ctx, false, "translator loop");
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/* Start translating. */
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gen_tb_start(tcg_ctx, db->tb);
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// tcg_dump_ops(tcg_ctx, false, "tb start");
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ops->tb_start(db, cpu);
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// tcg_dump_ops(tcg_ctx, false, "tb start 2");
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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 (!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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ops->translate_insn(db, cpu);
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// tcg_dump_ops(tcg_ctx, false, "insn translate");
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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(tcg_ctx) || 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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_end_loop:
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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(tcg_ctx, db->tb, db->num_insns - bp_insn);
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// tcg_dump_ops(tcg_ctx, false, "tb end");
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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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2022-06-02 15:46:02 +03:00
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hooked_regions_check(uc, db->tb->pc, db->tb->size);
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2021-10-03 17:14:44 +03:00
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if (block_hook) {
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TCGOp *tcg_op;
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// Unicorn: patch the callback to have the proper block size.
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if (prev_op) {
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// As explained further up in the function where prev_op is
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// assigned, we move forward in the tail queue, so we're modifying the
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// move instruction generated by gen_uc_tracecode() that contains
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// the instruction size to assign the proper size (replacing 0xF1F1F1F1).
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tcg_op = QTAILQ_NEXT(prev_op, link);
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} else {
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// this basic block is the first emulated code ever,
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// so the basic block operand is the first operand
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tcg_op = QTAILQ_FIRST(&tcg_ctx->ops);
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}
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tcg_op->args[1] = db->tb->size;
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}
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}
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