57 lines
2.1 KiB
C
57 lines
2.1 KiB
C
/* Copyright (C)
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* 2011 - Michael.Kang blackfin.kang@gmail.com
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#pragma once
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#include "core/arm/skyeye_common/armdefs.h"
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void switch_mode(ARMul_State* core, uint32_t mode);
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// Note that for the 3DS, a Thumb instruction will only ever be
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// two bytes in size. Thus we don't need to worry about ThumbEE
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// or Thumb-2 where instructions can be 4 bytes in length.
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static inline u32 GET_INST_SIZE(ARMul_State* core) {
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return core->TFlag? 2 : 4;
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}
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/**
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* Checks if the PC is being read, and if so, word-aligns it.
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* Used with address calculations.
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*
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* @param core The ARM CPU state instance.
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* @param Rn The register being read.
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*
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* @return If the PC is being read, then the word-aligned PC value is returned.
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* If the PC is not being read, then the value stored in the register is returned.
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*/
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static inline u32 CHECK_READ_REG15_WA(ARMul_State* core, int Rn) {
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return (Rn == 15) ? ((core->Reg[15] & ~0x3) + GET_INST_SIZE(core) * 2) : core->Reg[Rn];
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}
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/**
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* Reads the PC. Used for data processing operations that use the PC.
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*
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* @param core The ARM CPU state instance.
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* @param Rn The register being read.
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*
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* @return If the PC is being read, then the incremented PC value is returned.
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* If the PC is not being read, then the values stored in the register is returned.
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*/
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static inline u32 CHECK_READ_REG15(ARMul_State* core, int Rn) {
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return (Rn == 15) ? ((core->Reg[15] & ~0x1) + GET_INST_SIZE(core) * 2) : core->Reg[Rn];
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}
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