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ARM disassembler was erroneously accepting an invalid LSL instruction.

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For register-controlled shifts, we should check that the encoding constraint
Inst{7} = 0 and Inst{4} = 1 is satisfied.

rdar://problem/9237693


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128941 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Johnny Chen 2011-04-05 21:49:44 +00:00
parent 7670601313
commit c584e317e9
2 changed files with 13 additions and 0 deletions
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4
lib/Target/ARM/Disassembler/ARMDisassemblerCore.cpp
View File

@ -1068,6 +1068,10 @@ static bool DisassembleDPSoRegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
decodeRm(insn))));
if (Rs) {
// If Inst{7} != 0, we should reject this insn as an invalid encoding.
if (slice(insn, 7, 7))
return false;
// Register-controlled shifts: [Rm, Rs, shift].
MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
decodeRs(insn))));

9
test/MC/Disassembler/ARM/invalid-MOVs-LSL-arm.txt Normal file
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@ -0,0 +1,9 @@
# RUN: llvm-mc --disassemble %s -triple=arm-apple-darwin9 |& grep {invalid instruction encoding}
# Opcode=196 Name=MOVs Format=ARM_FORMAT_DPSOREGFRM(5)
# 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
# -------------------------------------------------------------------------------------------------
# | 1: 1: 0: 1| 0: 0: 0: 1| 1: 0: 1: 0| 0: 0: 0: 0| 0: 1: 0: 0| 0: 0: 1: 0| 1: 0: 0: 1| 0: 0: 1: 1|
# -------------------------------------------------------------------------------------------------
# A8.6.89 LSL (register): Inst{7-4} = 0b0001
0x93 0x42 0xa0 0xd1