forked from OSchip/llvm-project
677 lines
22 KiB
C++
677 lines
22 KiB
C++
//===-- DisassemblerLLVMC.cpp -----------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "DisassemblerLLVMC.h"
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#include "llvm-c/Disassembler.h"
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#include "llvm/Support/TargetSelect.h"
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#include "lldb/Core/Address.h"
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#include "lldb/Core/DataExtractor.h"
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#include "lldb/Core/Module.h"
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#include "lldb/Core/Stream.h"
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#include "lldb/Symbol/SymbolContext.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/Process.h"
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#include "lldb/Target/RegisterContext.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/StackFrame.h"
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#include <regex.h>
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using namespace lldb;
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using namespace lldb_private;
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class InstructionLLVMC : public lldb_private::Instruction
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{
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public:
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InstructionLLVMC (DisassemblerLLVMC &disasm,
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const lldb_private::Address &address,
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AddressClass addr_class) :
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Instruction(address, addr_class),
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m_is_valid(false),
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m_disasm(disasm),
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m_disasm_sp(disasm.shared_from_this()),
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m_does_branch(eLazyBoolCalculate)
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{
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}
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virtual
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~InstructionLLVMC ()
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{
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}
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static void
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PadToWidth (lldb_private::StreamString &ss,
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int new_width)
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{
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int old_width = ss.GetSize();
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if (old_width < new_width)
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{
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ss.Printf("%*s", new_width - old_width, "");
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}
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}
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virtual bool
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DoesBranch () const
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{
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return m_does_branch == eLazyBoolYes;
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}
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virtual size_t
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Decode (const lldb_private::Disassembler &disassembler,
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const lldb_private::DataExtractor &data,
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uint32_t data_offset)
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{
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// All we have to do is read the opcode which can be easy for some
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// architetures
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bool got_op = false;
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const ArchSpec &arch = m_disasm.GetArchitecture();
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const uint32_t min_op_byte_size = arch.GetMinimumOpcodeByteSize();
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const uint32_t max_op_byte_size = arch.GetMaximumOpcodeByteSize();
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if (min_op_byte_size == max_op_byte_size)
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{
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// Fixed size instructions, just read that amount of data.
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if (!data.ValidOffsetForDataOfSize(data_offset, min_op_byte_size))
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return false;
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switch (min_op_byte_size)
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{
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case 1:
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m_opcode.SetOpcode8 (data.GetU8 (&data_offset));
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got_op = true;
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break;
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case 2:
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m_opcode.SetOpcode16 (data.GetU16 (&data_offset));
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got_op = true;
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break;
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case 4:
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m_opcode.SetOpcode32 (data.GetU32 (&data_offset));
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got_op = true;
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break;
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case 8:
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m_opcode.SetOpcode64 (data.GetU64 (&data_offset));
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got_op = true;
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break;
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default:
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m_opcode.SetOpcodeBytes(data.PeekData(data_offset, min_op_byte_size), min_op_byte_size);
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got_op = true;
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break;
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}
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}
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if (!got_op)
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{
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::LLVMDisasmContextRef disasm_context = m_disasm.m_disasm_context;
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bool is_altnernate_isa = false;
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if (m_disasm.m_alternate_disasm_context)
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{
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const AddressClass address_class = GetAddressClass ();
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if (address_class == eAddressClassCodeAlternateISA)
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{
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disasm_context = m_disasm.m_alternate_disasm_context;
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is_altnernate_isa = true;
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}
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}
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const llvm::Triple::ArchType machine = arch.GetMachine();
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if (machine == llvm::Triple::arm || machine == llvm::Triple::thumb)
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{
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if (machine == llvm::Triple::thumb || is_altnernate_isa)
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{
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uint32_t thumb_opcode = data.GetU16(&data_offset);
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if ((thumb_opcode & 0xe000) != 0xe000 || ((thumb_opcode & 0x1800u) == 0))
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{
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m_opcode.SetOpcode16 (thumb_opcode);
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m_is_valid = true;
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}
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else
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{
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thumb_opcode <<= 16;
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thumb_opcode |= data.GetU16(&data_offset);
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m_opcode.SetOpcode16_2 (thumb_opcode);
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m_is_valid = true;
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}
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}
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else
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{
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m_opcode.SetOpcode32 (data.GetU32(&data_offset));
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m_is_valid = true;
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}
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}
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else
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{
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// The opcode isn't evenly sized, so we need to actually use the llvm
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// disassembler to parse it and get the size.
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char out_string[512];
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m_disasm.Lock(this, NULL);
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uint8_t *opcode_data = const_cast<uint8_t *>(data.PeekData (data_offset, 1));
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const size_t opcode_data_len = data.GetByteSize() - data_offset;
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const addr_t pc = m_address.GetFileAddress();
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const size_t inst_size = ::LLVMDisasmInstruction (disasm_context,
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opcode_data,
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opcode_data_len,
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pc, // PC value
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out_string,
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sizeof(out_string));
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// The address lookup function could have caused us to fill in our comment
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m_comment.clear();
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m_disasm.Unlock();
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if (inst_size == 0)
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m_opcode.Clear();
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else
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{
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m_opcode.SetOpcodeBytes(opcode_data, inst_size);
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m_is_valid = true;
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}
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}
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}
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return m_opcode.GetByteSize();
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}
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void
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AppendComment (std::string &description)
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{
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if (m_comment.empty())
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m_comment.swap (description);
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else
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{
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m_comment.append(", ");
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m_comment.append(description);
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}
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}
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virtual void
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CalculateMnemonicOperandsAndComment (const lldb_private::ExecutionContext *exe_ctx)
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{
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DataExtractor data;
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const AddressClass address_class = GetAddressClass ();
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if (m_opcode.GetData(data))
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{
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char out_string[512];
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::LLVMDisasmContextRef disasm_context;
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if (address_class == eAddressClassCodeAlternateISA)
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disasm_context = m_disasm.m_alternate_disasm_context;
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else
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disasm_context = m_disasm.m_disasm_context;
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lldb::addr_t pc = LLDB_INVALID_ADDRESS;
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if (exe_ctx)
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{
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Target *target = exe_ctx->GetTargetPtr();
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if (target)
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pc = m_address.GetLoadAddress(target);
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}
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if (pc == LLDB_INVALID_ADDRESS)
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pc = m_address.GetFileAddress();
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m_disasm.Lock(this, exe_ctx);
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uint8_t *opcode_data = const_cast<uint8_t *>(data.PeekData (0, 1));
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const size_t opcode_data_len = data.GetByteSize();
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size_t inst_size = ::LLVMDisasmInstruction (disasm_context,
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opcode_data,
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opcode_data_len,
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pc,
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out_string,
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sizeof(out_string));
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m_disasm.Unlock();
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if (inst_size == 0)
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{
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m_comment.assign ("unknown opcode");
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inst_size = m_opcode.GetByteSize();
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StreamString mnemonic_strm;
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uint32_t offset = 0;
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switch (inst_size)
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{
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case 1:
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{
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const uint8_t uval8 = data.GetU8 (&offset);
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m_opcode.SetOpcode8 (uval8);
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m_opcode_name.assign (".byte");
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mnemonic_strm.Printf("0x%2.2x", uval8);
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}
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break;
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case 2:
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{
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const uint16_t uval16 = data.GetU16(&offset);
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m_opcode.SetOpcode16(uval16);
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m_opcode_name.assign (".short");
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mnemonic_strm.Printf("0x%4.4x", uval16);
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}
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break;
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case 4:
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{
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const uint32_t uval32 = data.GetU32(&offset);
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m_opcode.SetOpcode32(uval32);
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m_opcode_name.assign (".long");
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mnemonic_strm.Printf("0x%8.8x", uval32);
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}
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break;
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case 8:
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{
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const uint64_t uval64 = data.GetU64(&offset);
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m_opcode.SetOpcode64(uval64);
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m_opcode_name.assign (".quad");
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mnemonic_strm.Printf("0x%16.16llx", uval64);
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}
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break;
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default:
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if (inst_size == 0)
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return;
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else
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{
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const uint8_t *bytes = data.PeekData(offset, inst_size);
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if (bytes == NULL)
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return;
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m_opcode_name.assign (".byte");
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m_opcode.SetOpcodeBytes(bytes, inst_size);
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mnemonic_strm.Printf("0x%2.2x", bytes[0]);
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for (uint32_t i=1; i<inst_size; ++i)
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mnemonic_strm.Printf(" 0x%2.2x", bytes[i]);
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}
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break;
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}
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m_mnemocics.swap(mnemonic_strm.GetString());
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return;
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}
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else
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{
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if (m_does_branch == eLazyBoolCalculate)
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{
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if (StringRepresentsBranch (out_string, strlen(out_string)))
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m_does_branch = eLazyBoolYes;
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else
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m_does_branch = eLazyBoolNo;
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}
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}
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if (!s_regex_compiled)
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{
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::regcomp(&s_regex, "[ \t]*([^ ^\t]+)[ \t]*([^ ^\t].*)?", REG_EXTENDED);
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s_regex_compiled = true;
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}
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::regmatch_t matches[3];
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if (!::regexec(&s_regex, out_string, sizeof(matches) / sizeof(::regmatch_t), matches, 0))
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{
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if (matches[1].rm_so != -1)
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m_opcode_name.assign(out_string + matches[1].rm_so, matches[1].rm_eo - matches[1].rm_so);
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if (matches[2].rm_so != -1)
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m_mnemocics.assign(out_string + matches[2].rm_so, matches[2].rm_eo - matches[2].rm_so);
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}
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}
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}
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bool
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IsValid ()
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{
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return m_is_valid;
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}
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size_t
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GetByteSize ()
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{
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return m_opcode.GetByteSize();
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}
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protected:
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bool StringRepresentsBranch (const char *data, size_t size)
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{
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const char *cursor = data;
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bool inWhitespace = true;
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while (inWhitespace && cursor < data + size)
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{
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switch (*cursor)
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{
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default:
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inWhitespace = false;
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break;
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case ' ':
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break;
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case '\t':
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break;
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}
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if (inWhitespace)
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++cursor;
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}
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if (cursor >= data + size)
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return false;
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llvm::Triple::ArchType arch = m_disasm.GetArchitecture().GetMachine();
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switch (arch)
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{
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default:
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return false;
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case llvm::Triple::x86:
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case llvm::Triple::x86_64:
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switch (cursor[0])
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{
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default:
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return false;
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case 'j':
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return true;
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case 'c':
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if (cursor[1] == 'a' &&
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cursor[2] == 'l' &&
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cursor[3] == 'l')
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return true;
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else
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return false;
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}
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case llvm::Triple::arm:
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case llvm::Triple::thumb:
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switch (cursor[0])
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{
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default:
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return false;
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case 'b':
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{
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switch (cursor[1])
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{
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default:
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return true;
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case 'f':
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case 'i':
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case 'k':
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return false;
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}
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}
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case 'c':
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{
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switch (cursor[1])
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{
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default:
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return false;
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case 'b':
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return true;
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}
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}
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}
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}
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return false;
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}
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bool m_is_valid;
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DisassemblerLLVMC &m_disasm;
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DisassemblerSP m_disasm_sp; // for ownership
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LazyBool m_does_branch;
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static bool s_regex_compiled;
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static ::regex_t s_regex;
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};
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bool InstructionLLVMC::s_regex_compiled = false;
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::regex_t InstructionLLVMC::s_regex;
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Disassembler *
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DisassemblerLLVMC::CreateInstance (const ArchSpec &arch)
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{
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if (arch.GetTriple().getArch() != llvm::Triple::UnknownArch)
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{
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std::auto_ptr<DisassemblerLLVMC> disasm_ap (new DisassemblerLLVMC(arch));
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if (disasm_ap.get() && disasm_ap->IsValid())
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return disasm_ap.release();
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}
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return NULL;
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}
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DisassemblerLLVMC::DisassemblerLLVMC (const ArchSpec &arch) :
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Disassembler(arch),
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m_exe_ctx (NULL),
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m_inst (NULL),
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m_disasm_context (NULL),
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m_alternate_disasm_context (NULL)
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{
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m_disasm_context = ::LLVMCreateDisasm(arch.GetTriple().getTriple().c_str(),
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(void*)this,
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/*TagType=*/1,
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NULL,
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DisassemblerLLVMC::SymbolLookupCallback);
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if (arch.GetTriple().getArch() == llvm::Triple::arm)
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{
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ArchSpec thumb_arch(arch);
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thumb_arch.GetTriple().setArchName(llvm::StringRef("thumbv7"));
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std::string thumb_triple(thumb_arch.GetTriple().getTriple());
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m_alternate_disasm_context = ::LLVMCreateDisasm(thumb_triple.c_str(),
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(void*)this,
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/*TagType=*/1,
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NULL,
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DisassemblerLLVMC::SymbolLookupCallback);
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}
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}
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DisassemblerLLVMC::~DisassemblerLLVMC()
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{
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if (m_disasm_context)
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{
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::LLVMDisasmDispose(m_disasm_context);
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m_disasm_context = NULL;
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}
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if (m_alternate_disasm_context)
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{
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::LLVMDisasmDispose(m_alternate_disasm_context);
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m_alternate_disasm_context = NULL;
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}
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}
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size_t
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DisassemblerLLVMC::DecodeInstructions (const Address &base_addr,
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const DataExtractor& data,
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uint32_t data_offset,
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uint32_t num_instructions,
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bool append)
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{
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if (!append)
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m_instruction_list.Clear();
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if (!IsValid())
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return 0;
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uint32_t data_cursor = data_offset;
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const size_t data_byte_size = data.GetByteSize();
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uint32_t instructions_parsed = 0;
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Address inst_addr(base_addr);
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while (data_cursor < data_byte_size && instructions_parsed < num_instructions)
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{
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AddressClass address_class = eAddressClassCode;
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if (m_alternate_disasm_context)
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address_class = inst_addr.GetAddressClass ();
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InstructionSP inst_sp(new InstructionLLVMC(*this,
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inst_addr,
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address_class));
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if (!inst_sp)
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break;
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uint32_t inst_size = inst_sp->Decode(*this, data, data_cursor);
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if (inst_size == 0)
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break;
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m_instruction_list.Append(inst_sp);
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data_cursor += inst_size;
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inst_addr.Slide(inst_size);
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instructions_parsed++;
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}
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return data_cursor - data_offset;
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}
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void
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DisassemblerLLVMC::Initialize()
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{
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PluginManager::RegisterPlugin (GetPluginNameStatic(),
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GetPluginDescriptionStatic(),
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CreateInstance);
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llvm::InitializeAllTargetInfos();
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llvm::InitializeAllTargetMCs();
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llvm::InitializeAllAsmParsers();
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llvm::InitializeAllDisassemblers();
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}
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void
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DisassemblerLLVMC::Terminate()
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{
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PluginManager::UnregisterPlugin (CreateInstance);
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}
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const char *
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DisassemblerLLVMC::GetPluginNameStatic()
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{
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return "llvm-mc";
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}
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const char *
|
|
DisassemblerLLVMC::GetPluginDescriptionStatic()
|
|
{
|
|
return "Disassembler that uses LLVM MC to disassemble i386, x86_64 and ARM.";
|
|
}
|
|
|
|
int DisassemblerLLVMC::OpInfoCallback (void *disassembler,
|
|
uint64_t pc,
|
|
uint64_t offset,
|
|
uint64_t size,
|
|
int tag_type,
|
|
void *tag_bug)
|
|
{
|
|
return static_cast<DisassemblerLLVMC*>(disassembler)->OpInfo (pc,
|
|
offset,
|
|
size,
|
|
tag_type,
|
|
tag_bug);
|
|
}
|
|
|
|
const char *DisassemblerLLVMC::SymbolLookupCallback (void *disassembler,
|
|
uint64_t value,
|
|
uint64_t *type,
|
|
uint64_t pc,
|
|
const char **name)
|
|
{
|
|
return static_cast<DisassemblerLLVMC*>(disassembler)->SymbolLookup(value,
|
|
type,
|
|
pc,
|
|
name);
|
|
}
|
|
|
|
int DisassemblerLLVMC::OpInfo (uint64_t PC,
|
|
uint64_t Offset,
|
|
uint64_t Size,
|
|
int tag_type,
|
|
void *tag_bug)
|
|
{
|
|
switch (tag_type)
|
|
{
|
|
default:
|
|
break;
|
|
case 1:
|
|
bzero (tag_bug, sizeof(::LLVMOpInfo1));
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
const char *DisassemblerLLVMC::SymbolLookup (uint64_t value,
|
|
uint64_t *type_ptr,
|
|
uint64_t pc,
|
|
const char **name)
|
|
{
|
|
if (*type_ptr)
|
|
{
|
|
if (m_exe_ctx && m_inst)
|
|
{
|
|
//std::string remove_this_prior_to_checkin;
|
|
Address reference_address;
|
|
|
|
Target *target = m_exe_ctx ? m_exe_ctx->GetTargetPtr() : NULL;
|
|
|
|
if (target && !target->GetSectionLoadList().IsEmpty())
|
|
target->GetSectionLoadList().ResolveLoadAddress(value, reference_address);
|
|
else
|
|
{
|
|
ModuleSP module_sp(m_inst->GetAddress().GetModule());
|
|
if (module_sp)
|
|
module_sp->ResolveFileAddress(value, reference_address);
|
|
}
|
|
|
|
if (reference_address.IsValid() && reference_address.GetSection())
|
|
{
|
|
StreamString ss;
|
|
|
|
reference_address.Dump (&ss,
|
|
target,
|
|
Address::DumpStyleResolvedDescriptionNoModule,
|
|
Address::DumpStyleSectionNameOffset);
|
|
|
|
if (!ss.GetString().empty())
|
|
{
|
|
//remove_this_prior_to_checkin = ss.GetString();
|
|
//if (*type_ptr)
|
|
m_inst->AppendComment(ss.GetString());
|
|
}
|
|
}
|
|
//printf ("DisassemblerLLVMC::SymbolLookup (value=0x%16.16llx, type=%llu, pc=0x%16.16llx, name=\"%s\") m_exe_ctx=%p, m_inst=%p\n", value, *type_ptr, pc, remove_this_prior_to_checkin.c_str(), m_exe_ctx, m_inst);
|
|
}
|
|
}
|
|
|
|
*type_ptr = LLVMDisassembler_ReferenceType_InOut_None;
|
|
*name = NULL;
|
|
return NULL;
|
|
}
|
|
|
|
//------------------------------------------------------------------
|
|
// PluginInterface protocol
|
|
//------------------------------------------------------------------
|
|
const char *
|
|
DisassemblerLLVMC::GetPluginName()
|
|
{
|
|
return "DisassemblerLLVMC";
|
|
}
|
|
|
|
const char *
|
|
DisassemblerLLVMC::GetShortPluginName()
|
|
{
|
|
return GetPluginNameStatic();
|
|
}
|
|
|
|
uint32_t
|
|
DisassemblerLLVMC::GetPluginVersion()
|
|
{
|
|
return 1;
|
|
}
|
|
|