x86 Namespace Reference

Classes
struct	InstructionOpcodeAndModrm
	These are the three values deciding instruction control flow kind. More...

Functions
lldb::InstructionControlFlowKind	MapOpcodeIntoControlFlowKind (InstructionOpcodeAndModrm opcode_and_modrm)
	Determine the InstructionControlFlowKind based on opcode and modrm bytes.
std::optional< InstructionOpcodeAndModrm >	InstructionLengthDecode (const uint8_t *inst_bytes, int bytes_len, bool is_exec_mode_64b)
	Decode an instruction into opcode, modrm and opcode_len.
lldb::InstructionControlFlowKind	GetControlFlowKind (bool is_exec_mode_64b, Opcode m_opcode)

Function Documentation

GetControlFlowKind()

lldb::InstructionControlFlowKind x86::GetControlFlowKind	(	bool	is_exec_mode_64b,
		Opcode	m_opcode
	)

Definition at line 391 of file DisassemblerLLVMC.cpp.

References lldb::eInstructionControlFlowKindUnknown, lldb_private::Opcode::GetByteSize(), lldb_private::Opcode::GetOpcodeBytes(), InstructionLengthDecode(), and MapOpcodeIntoControlFlowKind().

Referenced by InstructionLLVMC::GetControlFlowKind().

InstructionLengthDecode()

std::optional< InstructionOpcodeAndModrm > x86::InstructionLengthDecode	(	const uint8_t *	inst_bytes,
		int	bytes_len,
		bool	is_exec_mode_64b
	)

Decode an instruction into opcode, modrm and opcode_len.

Refer to http://ref.x86asm.net/coder.html for the instruction bytes layout. Opcodes in x86 are generally the first byte of instruction, though two-byte instructions and prefixes exist. ModR/M is the byte following the opcode and adds additional information for how the instruction is executed.

Parameters

[in]	inst_bytes	Raw bytes of the instruction
[in]	bytes_len	The length of the inst_bytes array.
[in]	is_exec_mode_64b	If true, the execution mode is 64 bit.

Returns

Returns decoded instruction as struct InstructionOpcodeAndModrm, holding primary_opcode, opcode_len and modrm byte. Refer to the struct definition for more details. Otherwise if the given instruction is invalid, returns std::nullopt.

Definition at line 263 of file DisassemblerLLVMC.cpp.

References x86::InstructionOpcodeAndModrm::modrm, x86::InstructionOpcodeAndModrm::opcode_len, and x86::InstructionOpcodeAndModrm::primary_opcode.

Referenced by GetControlFlowKind().

MapOpcodeIntoControlFlowKind()

lldb::InstructionControlFlowKind x86::MapOpcodeIntoControlFlowKind

(

InstructionOpcodeAndModrm

opcode_and_modrm

)

Determine the InstructionControlFlowKind based on opcode and modrm bytes.

Refer to http://ref.x86asm.net/coder.html for the full list of opcode and instruction set.

Parameters

[in]

opcode_and_modrm

Contains primary_opcode byte, its length, and ModR/M byte. Refer to the struct InstructionOpcodeAndModrm for details.

Returns

The control flow kind of the instruction or eInstructionControlFlowKindOther if the instruction doesn't affect the control flow of the program.

Definition at line 130 of file DisassemblerLLVMC.cpp.

References lldb::eInstructionControlFlowKindCall, lldb::eInstructionControlFlowKindCondJump, lldb::eInstructionControlFlowKindFarCall, lldb::eInstructionControlFlowKindFarJump, lldb::eInstructionControlFlowKindFarReturn, lldb::eInstructionControlFlowKindJump, lldb::eInstructionControlFlowKindOther, lldb::eInstructionControlFlowKindReturn, x86::InstructionOpcodeAndModrm::modrm, x86::InstructionOpcodeAndModrm::opcode_len, and x86::InstructionOpcodeAndModrm::primary_opcode.

Referenced by GetControlFlowKind().