diff options
Diffstat (limited to 'llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp')
| -rw-r--r-- | llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp b/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp index 48bcc9b2dcd..0940e2a2407 100644 --- a/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp +++ b/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp @@ -281,6 +281,8 @@ static DecodeStatus DecodeInstSyncBarrierOption(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeMSRMask(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder); +static DecodeStatus DecodeBankedReg(MCInst &Inst, unsigned Insn, + uint64_t Address, const void *Decoder); static DecodeStatus DecodeDoubleRegLoad(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder); static DecodeStatus DecodeDoubleRegStore(MCInst &Inst, unsigned Insn, @@ -4025,6 +4027,29 @@ static DecodeStatus DecodeMSRMask(MCInst &Inst, unsigned Val, return MCDisassembler::Success; } +static DecodeStatus DecodeBankedReg(MCInst &Inst, unsigned Val, + uint64_t Address, const void *Decoder) { + + unsigned R = fieldFromInstruction(Val, 5, 1); + unsigned SysM = fieldFromInstruction(Val, 0, 5); + + // The table of encodings for these banked registers comes from B9.2.3 of the + // ARM ARM. There are patterns, but nothing regular enough to make this logic + // neater. So by fiat, these values are UNPREDICTABLE: + if (!R) { + if (SysM == 0x7 || SysM == 0xf || SysM == 0x18 || SysM == 0x19 || + SysM == 0x1a || SysM == 0x1b) + return MCDisassembler::SoftFail; + } else { + if (SysM != 0xe && SysM != 0x10 && SysM != 0x12 && SysM != 0x14 && + SysM != 0x16 && SysM != 0x1c && SysM != 0x1e) + return MCDisassembler::SoftFail; + } + + Inst.addOperand(MCOperand::CreateImm(Val)); + return MCDisassembler::Success; +} + static DecodeStatus DecodeDoubleRegLoad(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder) { DecodeStatus S = MCDisassembler::Success; |
