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Add comments to the handling of opcode CPS3p to reject invalid instruction encoding,

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a test case of invalid CPS3p encoding and one for invalid VLDMSDB due to regs out of range.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128220 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Johnny Chen
2011-03-24 17:04:22 +00:00
parent 0a828fd7ef
commit ce1868b21c
3 changed files with 10 additions and 0 deletions
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2
lib/Target/ARM/Disassembler/ARMDisassemblerCore.cpp
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@ -2946,6 +2946,8 @@ static bool DisassembleMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
// of optional arguments is implemented.
if (Opcode == ARM::CPS3p) {
// Let's reject impossible imod values by returning false.
// AsmPrinter cannot handle imod=0b00, plus (imod=0b00,M=1,iflags!=0) is an
// invalid combination, so we just check for imod=0b00 here.
if (slice(insn, 19, 18) == 0 || slice(insn, 19, 18) == 1)
return false;
MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 18))); // imod