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[Mips][Disassembler]When disassembler meets load/store from coprocessor 2 instructions for mips r6 it crashes as the access to operands array is out of range. This patch adds dedicated decoder method that properly handles decoding of these instructions.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226652 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Vladimir Medic
2015-01-21 10:47:36 +00:00
parent 74670deb21
commit cde587f359
8 changed files with 39 additions and 8 deletions
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21
lib/Target/Mips/Disassembler/MipsDisassembler.cpp
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@@ -304,6 +304,10 @@ static DecodeStatus DecodeFMem3(MCInst &Inst, unsigned Insn,
uint64_t Address,
const void *Decoder);
static DecodeStatus DecodeFMemCop2R6(MCInst &Inst, unsigned Insn,
uint64_t Address,
const void *Decoder);
static DecodeStatus DecodeSpecial3LlSc(MCInst &Inst,
unsigned Insn,
uint64_t Address,
@@ -1354,6 +1358,23 @@ static DecodeStatus DecodeFMem3(MCInst &Inst,
return MCDisassembler::Success;
}
static DecodeStatus DecodeFMemCop2R6(MCInst &Inst,
unsigned Insn,
uint64_t Address,
const void *Decoder) {
int Offset = SignExtend32<11>(Insn & 0x07ff);
unsigned Reg = fieldFromInstruction(Insn, 16, 5);
unsigned Base = fieldFromInstruction(Insn, 11, 5);
Reg = getReg(Decoder, Mips::COP2RegClassID, Reg);
Base = getReg(Decoder, Mips::GPR32RegClassID, Base);
Inst.addOperand(MCOperand::CreateReg(Reg));
Inst.addOperand(MCOperand::CreateReg(Base));
Inst.addOperand(MCOperand::CreateImm(Offset));
return MCDisassembler::Success;
}
static DecodeStatus DecodeSpecial3LlSc(MCInst &Inst,
unsigned Insn,
uint64_t Address,