Add an entry for CMP (immediate) (Encoding T1) to the g_thumb_opcodes table.
llvm-svn: 125333
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@ -1661,6 +1661,55 @@ EmulateInstructionARM::EmulateAddRdnRm (ARMEncoding encoding)
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return true;
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}
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bool
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EmulateInstructionARM::EmulateCmpRnImm (ARMEncoding encoding)
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{
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#if 0
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// ARM pseudo code...
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if ConditionPassed() then
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EncodingSpecificOperations();
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(result, carry, overflow) = AddWithCarry(R[n], NOT(imm32), '1');
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APSR.N = result<31>;
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APSR.Z = IsZeroBit(result);
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APSR.C = carry;
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APSR.V = overflow;
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#endif
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bool success = false;
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const uint32_t opcode = OpcodeAsUnsigned (&success);
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if (!success)
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return false;
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uint32_t Rn; // the first operand
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uint32_t imm32; // the immediate value to be compared with
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switch (encoding) {
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case eEncodingT1:
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Rn = Bits32(opcode, 10, 8);
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imm32 = Bits32(opcode, 7, 0);
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break;
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default:
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return false;
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}
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// Read the register value from the operand register Rn.
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uint32_t reg_val = ReadRegisterUnsigned(eRegisterKindDWARF, dwarf_r0 + Rn, 0, &success);
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if (!success)
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return false;
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EmulateInstruction::Context context = { EmulateInstruction::eContextImmediate, 0, 0, 0};
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AddWithCarryResult res = AddWithCarry(reg_val, ~imm32, 1);
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m_new_inst_cpsr = m_inst_cpsr;
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SetBit32(m_new_inst_cpsr, CPSR_N, Bit32(res.result, CPSR_N));
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SetBit32(m_new_inst_cpsr, CPSR_Z, res.result == 0 ? 1 : 0);
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SetBit32(m_new_inst_cpsr, CPSR_C, res.carry_out);
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SetBit32(m_new_inst_cpsr, CPSR_V, res.overflow);
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if (m_new_inst_cpsr != m_inst_cpsr)
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{
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if (!WriteRegisterUnsigned (context, eRegisterKindGeneric, LLDB_REGNUM_GENERIC_FLAGS, m_new_inst_cpsr))
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return false;
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}
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return true;
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}
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// LDM loads multiple registers from consecutive memory locations, using an
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// address from a base register. Optionally the addres just above the highest of those locations
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// can be written back to the base register.
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@ -2288,6 +2337,8 @@ EmulateInstructionARM::GetThumbOpcodeForInstruction (const uint32_t opcode)
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{ 0xffffff00, 0x00004600, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateMovRdRm, "mov<c> <Rd>, <Rm>"},
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// move from low register to low register
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{ 0xffffffc0, 0x00000000, ARMvAll, eEncodingT2, eSize16, &EmulateInstructionARM::EmulateMovRdRm, "movs <Rd>, <Rm>"},
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// compare a register with immediate
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{ 0xfffff800, 0x00002800, ARMvAll, eEncodingT1, eSize16, &EmulateInstructionARM::EmulateCmpRnImm, "cmp<c> <Rn>, #imm8"},
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//----------------------------------------------------------------------
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// Load instructions
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@ -271,6 +271,13 @@ protected:
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bool
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EmulateAddRdnRm (ARMEncoding encoding);
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// MOV (register)
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bool
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EmulateMovRdRm (ARMEncoding encoding);
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bool
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EmulateCmpRnImm (ARMEncoding encoding);
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bool
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EmulateLDM (ARMEncoding encoding);
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@ -283,10 +290,6 @@ protected:
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bool
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EmulateLDRRtRnImm (ARMEncoding encoding);
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// MOV (register)
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bool
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EmulateMovRdRm (ARMEncoding encoding);
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uint32_t m_arm_isa;
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Mode m_inst_mode;
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uint32_t m_inst_cpsr;
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