mirror of
https://github.com/hrydgard/ppsspp.git
synced 2024-11-24 05:49:58 +00:00
103 lines
2.3 KiB
C++
103 lines
2.3 KiB
C++
// Copyright (c) 2012- PPSSPP Project.
|
|
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, version 2.0 or later versions.
|
|
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License 2.0 for more details.
|
|
|
|
// A copy of the GPL 2.0 should have been included with the program.
|
|
// If not, see http://www.gnu.org/licenses/
|
|
|
|
// Official git repository and contact information can be found at
|
|
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.
|
|
|
|
#include "MIPS.h"
|
|
#include "MIPSTables.h"
|
|
#include "MIPSCodeUtils.h"
|
|
#include "../Host.h"
|
|
|
|
namespace MIPSCodeUtils
|
|
{
|
|
|
|
#define FULLOP_JR_RA 0x03e00008
|
|
#define OP_SYSCALL 0x0000000c
|
|
#define OP_SYSCALL_MASK 0xFC00003F
|
|
|
|
u32 GetJumpTarget(u32 addr)
|
|
{
|
|
u32 op = Memory::Read_Instruction(addr);
|
|
if (op)
|
|
{
|
|
u32 maskedOp = op & 0xFC000000;
|
|
if (maskedOp == 0x0C000000 || maskedOp == 0x08000000) //jal
|
|
{
|
|
u32 target = (addr & 0xF0000000) | ((op&0x03FFFFFF) << 2);
|
|
return target;
|
|
}
|
|
else
|
|
return INVALIDTARGET;
|
|
}
|
|
else
|
|
return INVALIDTARGET;
|
|
}
|
|
|
|
u32 GetBranchTarget(u32 addr)
|
|
{
|
|
u32 op = Memory::Read_Instruction(addr);
|
|
if (op)
|
|
{
|
|
u32 info = MIPSGetInfo(op);
|
|
if (info & IS_CONDBRANCH)
|
|
{
|
|
return addr + 4 + ((signed short)(op&0xFFFF)<<2);
|
|
}
|
|
else
|
|
return INVALIDTARGET;
|
|
}
|
|
else
|
|
return INVALIDTARGET;
|
|
}
|
|
|
|
u32 GetBranchTargetNoRA(u32 addr)
|
|
{
|
|
u32 op = Memory::Read_Instruction(addr);
|
|
if (op)
|
|
{
|
|
u32 info = MIPSGetInfo(op);
|
|
if ((info & IS_CONDBRANCH) && !(info & OUT_RA))
|
|
{
|
|
return addr + 4 + ((signed short)(op&0xFFFF)<<2);
|
|
}
|
|
else
|
|
return INVALIDTARGET;
|
|
}
|
|
else
|
|
return INVALIDTARGET;
|
|
}
|
|
|
|
u32 GetSureBranchTarget(u32 addr)
|
|
{
|
|
u32 op = Memory::Read_Instruction(addr);
|
|
if (op)
|
|
{
|
|
u32 info = MIPSGetInfo(op);
|
|
if (info & IS_CONDBRANCH)
|
|
{
|
|
//TODO: safer check
|
|
if ((op & 0xFFFF0000) == 0x10000000)
|
|
return addr + ((signed short)(op&0xFFFF)<<2);
|
|
else
|
|
return INVALIDTARGET;
|
|
}
|
|
else
|
|
return INVALIDTARGET;
|
|
}
|
|
else
|
|
return INVALIDTARGET;
|
|
}
|
|
}
|