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Handle the thumb branch instructions which have their cond bits embedded in the instruction stream. 

llvm-svn: 124925
This commit is contained in:
Johnny Chen 2011-02-05 01:39:52 +00:00
parent 6c9cd14bf9
commit 56902044a7
1 changed files with 17 additions and 0 deletions
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17
lldb/source/Plugins/Instruction/ARM/EmulateInstructionARM.cpp
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@ -1606,6 +1606,23 @@ EmulateInstructionARM::CurrentCond ()
return UnsignedBits(m_inst.opcode.inst32, 31, 28);
case eModeThumb:
// For T1 and T3 encodings of the Branch instruction, it returns the 4-bit
// 'cond' field of the encoding.
if (m_inst.opcode_type == eOpcode16 &&
Bits32(m_inst.opcode.inst16, 15, 12) == 0x0d &&
Bits32(m_inst.opcode.inst16, 11, 7) != 0x0f)
{
return Bits32(m_inst.opcode.inst16, 11, 7);
}
else if (m_inst.opcode_type == eOpcode32 &&
Bits32(m_inst.opcode.inst32, 31, 27) == 0x1e &&
Bits32(m_inst.opcode.inst32, 15, 14) == 0x02 &&
Bits32(m_inst.opcode.inst32, 12, 12) == 0x00 &&
Bits32(m_inst.opcode.inst32, 25, 22) <= 0x0d)
{
return Bits32(m_inst.opcode.inst32, 25, 22);
}
return m_it_session.GetCond();
}
return UINT32_MAX; // Return invalid value