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Thumb2 assembly parsing and encoding for LDRD(immediate).

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Refactor operand handling for STRD as well. Tests for that forthcoming.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139322 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach
2011-09-08 22:07:06 +00:00
parent 7ec8fb8830
commit a77295db19
8 changed files with 244 additions and 26 deletions
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76
lib/Target/ARM/Disassembler/ARMDisassembler.cpp
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@ -293,6 +293,10 @@ static DecodeStatus DecodeThumbBLTargetOperand(llvm::MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder);
static DecodeStatus DecodeIT(llvm::MCInst &Inst, unsigned Val,
uint64_t Address, const void *Decoder);
static DecodeStatus DecodeT2LDRDPreInstruction(llvm::MCInst &Inst,unsigned Insn,
uint64_t Address, const void *Decoder);
static DecodeStatus DecodeT2STRDPreInstruction(llvm::MCInst &Inst,unsigned Insn,
uint64_t Address, const void *Decoder);
#include "ARMGenDisassemblerTables.inc"
#include "ARMGenInstrInfo.inc"
@ -3649,3 +3653,75 @@ static DecodeStatus DecodeIT(llvm::MCInst &Inst, unsigned Insn,
Inst.addOperand(MCOperand::CreateImm(mask));
return S;
}
static DecodeStatus
DecodeT2LDRDPreInstruction(llvm::MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rt = fieldFromInstruction32(Insn, 12, 4);
unsigned Rt2 = fieldFromInstruction32(Insn, 8, 4);
unsigned Rn = fieldFromInstruction32(Insn, 16, 4);
unsigned addr = fieldFromInstruction32(Insn, 0, 8);
unsigned W = fieldFromInstruction32(Insn, 21, 1);
unsigned U = fieldFromInstruction32(Insn, 23, 1);
unsigned P = fieldFromInstruction32(Insn, 24, 1);
bool writeback = (W == 1) | (P == 0);
addr |= (U << 8) | (Rn << 9);
if (writeback && (Rn == Rt || Rn == Rt2))
Check(S, MCDisassembler::SoftFail);
if (Rt == Rt2)
Check(S, MCDisassembler::SoftFail);
// Rt
if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder)))
return MCDisassembler::Fail;
// Rt2
if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder)))
return MCDisassembler::Fail;
// Writeback operand
if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder)))
return MCDisassembler::Fail;
// addr
if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder)))
return MCDisassembler::Fail;
return S;
}
static DecodeStatus
DecodeT2STRDPreInstruction(llvm::MCInst &Inst, unsigned Insn,
uint64_t Address, const void *Decoder) {
DecodeStatus S = MCDisassembler::Success;
unsigned Rt = fieldFromInstruction32(Insn, 12, 4);
unsigned Rt2 = fieldFromInstruction32(Insn, 8, 4);
unsigned Rn = fieldFromInstruction32(Insn, 16, 4);
unsigned addr = fieldFromInstruction32(Insn, 0, 8);
unsigned W = fieldFromInstruction32(Insn, 21, 1);
unsigned U = fieldFromInstruction32(Insn, 23, 1);
unsigned P = fieldFromInstruction32(Insn, 24, 1);
bool writeback = (W == 1) | (P == 0);
addr |= (U << 8) | (Rn << 9);
if (writeback && (Rn == Rt || Rn == Rt2))
Check(S, MCDisassembler::SoftFail);
// Writeback operand
if (!Check(S, DecoderGPRRegisterClass(Inst, Rn, Address, Decoder)))
return MCDisassembler::Fail;
// Rt
if (!Check(S, DecoderGPRRegisterClass(Inst, Rt, Address, Decoder)))
return MCDisassembler::Fail;
// Rt2
if (!Check(S, DecoderGPRRegisterClass(Inst, Rt2, Address, Decoder)))
return MCDisassembler::Fail;
// addr
if (!Check(S, DecodeT2AddrModeImm8s4(Inst, addr, Address, Decoder)))
return MCDisassembler::Fail;
return S;
}