89 lines
2.4 KiB
C++
89 lines
2.4 KiB
C++
/* This file is part of the dynarmic project.
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* Copyright (c) 2016 MerryMage
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* This software may be used and distributed according to the terms of the GNU
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* General Public License version 2 or any later version.
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*/
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#include "common/bit_util.h"
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#include "translate_arm.h"
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namespace Dynarmic::A32 {
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// B <label>
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bool ArmTranslatorVisitor::arm_B(Cond cond, Imm24 imm24) {
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if (!ConditionPassed(cond)) {
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return true;
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}
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const u32 imm32 = Common::SignExtend<26, u32>(imm24 << 2) + 8;
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const auto new_location = ir.current_location.AdvancePC(imm32);
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ir.SetTerm(IR::Term::LinkBlock{new_location});
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return false;
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}
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// BL <label>
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bool ArmTranslatorVisitor::arm_BL(Cond cond, Imm24 imm24) {
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if (!ConditionPassed(cond)) {
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return true;
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}
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ir.PushRSB(ir.current_location.AdvancePC(4));
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ir.SetRegister(Reg::LR, ir.Imm32(ir.current_location.PC() + 4));
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const u32 imm32 = Common::SignExtend<26, u32>(imm24 << 2) + 8;
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const auto new_location = ir.current_location.AdvancePC(imm32);
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ir.SetTerm(IR::Term::LinkBlock{new_location});
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return false;
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}
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// BLX <label>
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bool ArmTranslatorVisitor::arm_BLX_imm(bool H, Imm24 imm24) {
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ir.PushRSB(ir.current_location.AdvancePC(4));
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ir.SetRegister(Reg::LR, ir.Imm32(ir.current_location.PC() + 4));
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const u32 imm32 = Common::SignExtend<26, u32>((imm24 << 2)) + (H ? 2 : 0) + 8;
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const auto new_location = ir.current_location.AdvancePC(imm32).SetTFlag(true);
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ir.SetTerm(IR::Term::LinkBlock{new_location});
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return false;
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}
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// BLX <Rm>
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bool ArmTranslatorVisitor::arm_BLX_reg(Cond cond, Reg m) {
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if (m == Reg::PC) {
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return UnpredictableInstruction();
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}
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if (!ConditionPassed(cond)) {
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return true;
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}
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ir.PushRSB(ir.current_location.AdvancePC(4));
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ir.BXWritePC(ir.GetRegister(m));
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ir.SetRegister(Reg::LR, ir.Imm32(ir.current_location.PC() + 4));
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ir.SetTerm(IR::Term::FastDispatchHint{});
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return false;
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}
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// BX <Rm>
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bool ArmTranslatorVisitor::arm_BX(Cond cond, Reg m) {
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if (!ConditionPassed(cond)) {
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return true;
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}
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ir.BXWritePC(ir.GetRegister(m));
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if (m == Reg::R14) {
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ir.SetTerm(IR::Term::PopRSBHint{});
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} else {
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ir.SetTerm(IR::Term::FastDispatchHint{});
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}
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return false;
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}
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bool ArmTranslatorVisitor::arm_BXJ(Cond cond, Reg m) {
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// Jazelle not supported
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return arm_BX(cond, m);
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}
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} // namespace Dynarmic::A32
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