forked from OSchip/llvm-project
480 lines
12 KiB
C++
480 lines
12 KiB
C++
//===-- ELFHeader.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 <cstring>
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#include "lldb/Core/DataExtractor.h"
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#include "lldb/Core/Section.h"
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#include "lldb/Core/Stream.h"
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#include "ELFHeader.h"
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using namespace elf;
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using namespace lldb;
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using namespace llvm::ELF;
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//------------------------------------------------------------------------------
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// Static utility functions.
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//
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// GetMaxU64 and GetMaxS64 wrap the similarly named methods from DataExtractor
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// with error handling code and provide for parsing a sequence of values.
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static bool
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GetMaxU64(const lldb_private::DataExtractor &data,
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lldb::offset_t *offset,
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uint64_t *value,
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uint32_t byte_size)
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{
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const lldb::offset_t saved_offset = *offset;
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*value = data.GetMaxU64(offset, byte_size);
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return *offset != saved_offset;
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}
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static bool
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GetMaxU64(const lldb_private::DataExtractor &data,
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lldb::offset_t *offset,
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uint64_t *value,
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uint32_t byte_size,
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uint32_t count)
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{
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lldb::offset_t saved_offset = *offset;
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for (uint32_t i = 0; i < count; ++i, ++value)
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{
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if (GetMaxU64(data, offset, value, byte_size) == false)
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{
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*offset = saved_offset;
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return false;
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}
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}
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return true;
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}
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static bool
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GetMaxS64(const lldb_private::DataExtractor &data,
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lldb::offset_t *offset,
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int64_t *value,
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uint32_t byte_size)
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{
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const lldb::offset_t saved_offset = *offset;
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*value = data.GetMaxS64(offset, byte_size);
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return *offset != saved_offset;
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}
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static bool
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GetMaxS64(const lldb_private::DataExtractor &data,
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lldb::offset_t *offset,
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int64_t *value,
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uint32_t byte_size,
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uint32_t count)
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{
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lldb::offset_t saved_offset = *offset;
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for (uint32_t i = 0; i < count; ++i, ++value)
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{
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if (GetMaxS64(data, offset, value, byte_size) == false)
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{
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*offset = saved_offset;
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return false;
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}
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}
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return true;
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}
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//------------------------------------------------------------------------------
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// ELFHeader
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ELFHeader::ELFHeader()
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{
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memset(this, 0, sizeof(ELFHeader));
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}
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ByteOrder
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ELFHeader::GetByteOrder() const
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{
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if (e_ident[EI_DATA] == ELFDATA2MSB)
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return eByteOrderBig;
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if (e_ident[EI_DATA] == ELFDATA2LSB)
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return eByteOrderLittle;
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return eByteOrderInvalid;
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}
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bool
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ELFHeader::Parse(lldb_private::DataExtractor &data, lldb::offset_t *offset)
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{
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// Read e_ident. This provides byte order and address size info.
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if (data.GetU8(offset, &e_ident, EI_NIDENT) == NULL)
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return false;
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const unsigned byte_size = Is32Bit() ? 4 : 8;
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data.SetByteOrder(GetByteOrder());
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data.SetAddressByteSize(byte_size);
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// Read e_type and e_machine.
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if (data.GetU16(offset, &e_type, 2) == NULL)
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return false;
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// Read e_version.
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if (data.GetU32(offset, &e_version, 1) == NULL)
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return false;
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// Read e_entry, e_phoff and e_shoff.
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if (GetMaxU64(data, offset, &e_entry, byte_size, 3) == false)
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return false;
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// Read e_flags.
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if (data.GetU32(offset, &e_flags, 1) == NULL)
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return false;
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// Read e_ehsize, e_phentsize, e_phnum, e_shentsize, e_shnum and
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// e_shstrndx.
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if (data.GetU16(offset, &e_ehsize, 6) == NULL)
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return false;
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return true;
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}
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bool
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ELFHeader::MagicBytesMatch(const uint8_t *magic)
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{
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return memcmp(magic, ElfMagic, strlen(ElfMagic)) == 0;
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}
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unsigned
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ELFHeader::AddressSizeInBytes(const uint8_t *magic)
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{
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unsigned address_size = 0;
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switch (magic[EI_CLASS])
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{
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case ELFCLASS32:
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address_size = 4;
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break;
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case ELFCLASS64:
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address_size = 8;
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break;
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}
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return address_size;
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}
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unsigned
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ELFHeader::GetRelocationJumpSlotType() const
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{
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unsigned slot = 0;
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switch (e_machine)
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{
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default:
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assert(false && "architecture not supported");
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break;
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case EM_PPC:
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slot = R_PPC_JMP_SLOT;
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break;
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case EM_PPC64:
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slot = R_PPC64_JMP_SLOT;
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break;
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case EM_386:
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case EM_IAMCU: // FIXME: is this correct?
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slot = R_386_JUMP_SLOT;
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break;
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case EM_X86_64:
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slot = R_X86_64_JUMP_SLOT;
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break;
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case EM_ARM:
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slot = R_ARM_JUMP_SLOT;
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break;
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case EM_HEXAGON:
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slot = R_HEX_JMP_SLOT;
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break;
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case EM_AARCH64:
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slot = R_AARCH64_JUMP_SLOT;
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break;
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case EM_MIPS:
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slot = R_MIPS_JUMP_SLOT;
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break;
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}
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return slot;
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}
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//------------------------------------------------------------------------------
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// ELFSectionHeader
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ELFSectionHeader::ELFSectionHeader()
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{
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memset(this, 0, sizeof(ELFSectionHeader));
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}
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bool
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ELFSectionHeader::Parse(const lldb_private::DataExtractor &data,
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lldb::offset_t *offset)
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{
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const unsigned byte_size = data.GetAddressByteSize();
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// Read sh_name and sh_type.
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if (data.GetU32(offset, &sh_name, 2) == NULL)
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return false;
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// Read sh_flags.
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if (GetMaxU64(data, offset, &sh_flags, byte_size) == false)
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return false;
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// Read sh_addr, sh_off and sh_size.
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if (GetMaxU64(data, offset, &sh_addr, byte_size, 3) == false)
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return false;
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// Read sh_link and sh_info.
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if (data.GetU32(offset, &sh_link, 2) == NULL)
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return false;
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// Read sh_addralign and sh_entsize.
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if (GetMaxU64(data, offset, &sh_addralign, byte_size, 2) == false)
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return false;
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return true;
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}
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//------------------------------------------------------------------------------
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// ELFSymbol
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ELFSymbol::ELFSymbol()
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{
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memset(this, 0, sizeof(ELFSymbol));
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}
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#define ENUM_TO_CSTR(e) case e: return #e
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const char *
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ELFSymbol::bindingToCString(unsigned char binding)
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{
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switch (binding)
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{
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ENUM_TO_CSTR(STB_LOCAL);
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ENUM_TO_CSTR(STB_GLOBAL);
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ENUM_TO_CSTR(STB_WEAK);
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ENUM_TO_CSTR(STB_LOOS);
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ENUM_TO_CSTR(STB_HIOS);
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ENUM_TO_CSTR(STB_LOPROC);
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ENUM_TO_CSTR(STB_HIPROC);
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}
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return "";
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}
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const char *
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ELFSymbol::typeToCString(unsigned char type)
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{
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switch (type)
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{
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ENUM_TO_CSTR(STT_NOTYPE);
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ENUM_TO_CSTR(STT_OBJECT);
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ENUM_TO_CSTR(STT_FUNC);
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ENUM_TO_CSTR(STT_SECTION);
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ENUM_TO_CSTR(STT_FILE);
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ENUM_TO_CSTR(STT_COMMON);
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ENUM_TO_CSTR(STT_TLS);
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ENUM_TO_CSTR(STT_GNU_IFUNC);
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ENUM_TO_CSTR(STT_HIOS);
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ENUM_TO_CSTR(STT_LOPROC);
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ENUM_TO_CSTR(STT_HIPROC);
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}
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return "";
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}
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const char *
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ELFSymbol::sectionIndexToCString (elf_half shndx,
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const lldb_private::SectionList *section_list)
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{
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switch (shndx)
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{
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ENUM_TO_CSTR(SHN_UNDEF);
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ENUM_TO_CSTR(SHN_LOPROC);
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ENUM_TO_CSTR(SHN_HIPROC);
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ENUM_TO_CSTR(SHN_LOOS);
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ENUM_TO_CSTR(SHN_HIOS);
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ENUM_TO_CSTR(SHN_ABS);
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ENUM_TO_CSTR(SHN_COMMON);
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ENUM_TO_CSTR(SHN_XINDEX);
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default:
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{
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const lldb_private::Section *section = section_list->GetSectionAtIndex(shndx).get();
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if (section)
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return section->GetName().AsCString("");
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}
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break;
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}
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return "";
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}
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void
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ELFSymbol::Dump (lldb_private::Stream *s,
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uint32_t idx,
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const lldb_private::DataExtractor *strtab_data,
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const lldb_private::SectionList *section_list)
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{
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s->Printf("[%3u] 0x%16.16" PRIx64 " 0x%16.16" PRIx64 " 0x%8.8x 0x%2.2x (%-10s %-13s) 0x%2.2x 0x%4.4x (%-10s) %s\n",
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idx,
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st_value,
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st_size,
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st_name,
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st_info,
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bindingToCString (getBinding()),
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typeToCString (getType()),
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st_other,
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st_shndx,
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sectionIndexToCString (st_shndx, section_list),
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strtab_data ? strtab_data->PeekCStr(st_name) : "");
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}
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bool
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ELFSymbol::Parse(const lldb_private::DataExtractor &data, lldb::offset_t *offset)
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{
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const unsigned byte_size = data.GetAddressByteSize();
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const bool parsing_32 = byte_size == 4;
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// Read st_name.
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if (data.GetU32(offset, &st_name, 1) == NULL)
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return false;
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if (parsing_32)
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{
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// Read st_value and st_size.
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if (GetMaxU64(data, offset, &st_value, byte_size, 2) == false)
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return false;
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// Read st_info and st_other.
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if (data.GetU8(offset, &st_info, 2) == NULL)
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return false;
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// Read st_shndx.
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if (data.GetU16(offset, &st_shndx, 1) == NULL)
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return false;
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}
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else
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{
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// Read st_info and st_other.
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if (data.GetU8(offset, &st_info, 2) == NULL)
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return false;
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// Read st_shndx.
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if (data.GetU16(offset, &st_shndx, 1) == NULL)
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return false;
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// Read st_value and st_size.
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if (data.GetU64(offset, &st_value, 2) == NULL)
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return false;
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}
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return true;
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}
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//------------------------------------------------------------------------------
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// ELFProgramHeader
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ELFProgramHeader::ELFProgramHeader()
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{
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memset(this, 0, sizeof(ELFProgramHeader));
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}
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bool
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ELFProgramHeader::Parse(const lldb_private::DataExtractor &data,
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lldb::offset_t *offset)
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{
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const uint32_t byte_size = data.GetAddressByteSize();
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const bool parsing_32 = byte_size == 4;
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// Read p_type;
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if (data.GetU32(offset, &p_type, 1) == NULL)
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return false;
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if (parsing_32) {
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// Read p_offset, p_vaddr, p_paddr, p_filesz and p_memsz.
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if (GetMaxU64(data, offset, &p_offset, byte_size, 5) == false)
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return false;
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// Read p_flags.
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if (data.GetU32(offset, &p_flags, 1) == NULL)
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return false;
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// Read p_align.
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if (GetMaxU64(data, offset, &p_align, byte_size) == false)
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return false;
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}
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else {
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// Read p_flags.
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if (data.GetU32(offset, &p_flags, 1) == NULL)
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return false;
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// Read p_offset, p_vaddr, p_paddr, p_filesz, p_memsz and p_align.
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if (GetMaxU64(data, offset, &p_offset, byte_size, 6) == false)
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return false;
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}
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return true;
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}
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//------------------------------------------------------------------------------
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// ELFDynamic
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ELFDynamic::ELFDynamic()
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{
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memset(this, 0, sizeof(ELFDynamic));
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}
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bool
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ELFDynamic::Parse(const lldb_private::DataExtractor &data, lldb::offset_t *offset)
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{
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const unsigned byte_size = data.GetAddressByteSize();
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return GetMaxS64(data, offset, &d_tag, byte_size, 2);
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}
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//------------------------------------------------------------------------------
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// ELFRel
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ELFRel::ELFRel()
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{
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memset(this, 0, sizeof(ELFRel));
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}
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bool
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ELFRel::Parse(const lldb_private::DataExtractor &data, lldb::offset_t *offset)
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{
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const unsigned byte_size = data.GetAddressByteSize();
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// Read r_offset and r_info.
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if (GetMaxU64(data, offset, &r_offset, byte_size, 2) == false)
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return false;
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return true;
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}
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//------------------------------------------------------------------------------
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// ELFRela
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ELFRela::ELFRela()
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{
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memset(this, 0, sizeof(ELFRela));
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}
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bool
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ELFRela::Parse(const lldb_private::DataExtractor &data, lldb::offset_t *offset)
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{
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const unsigned byte_size = data.GetAddressByteSize();
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// Read r_offset and r_info.
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if (GetMaxU64(data, offset, &r_offset, byte_size, 2) == false)
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return false;
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// Read r_addend;
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if (GetMaxS64(data, offset, &r_addend, byte_size) == false)
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return false;
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return true;
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}
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