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https://gitlab.com/freepascal.org/lazarus/lazarus.git
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395 lines
11 KiB
ObjectPascal
395 lines
11 KiB
ObjectPascal
{
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This unit contains the types needed for reading Elf images.
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This file was ported from DUBY. See svn log for details
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---------------------------------------------------------------------------
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***************************************************************************
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* *
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* This source is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This code is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* General Public License for more details. *
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* *
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* A copy of the GNU General Public License is available on the World *
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* Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also *
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* obtain it by writing to the Free Software Foundation, *
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* Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1335, USA. *
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* *
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***************************************************************************
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}
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unit FpImgReaderElf;
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{$mode objfpc}{$H+}
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interface
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uses
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Classes, SysUtils,
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FpImgReaderBase,
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fpDbgSymTable,
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FpImgReaderElfTypes, LCLProc; // these files are part of
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type
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TElfSection = packed record
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name : AnsiString;
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FileOfs : QWord;
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Address : QWord;
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Size : QWord;
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end;
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{ TElfFile }
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TElfFile = class(TObject)
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private
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FIs64Bit: boolean;
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protected
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function Load32BitFile(ALoader: TDbgFileLoader): Boolean;
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function Load64BitFile(ALoader: TDbgFileLoader): Boolean;
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procedure AddSection(const name: AnsiString; FileOffset, Address, Size: Qword);
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public
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sections : array of TElfSection;
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seccount : Integer;
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function LoadFromFile(ALoader: TDbgFileLoader): Boolean;
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function FindSection(const Name: String): Integer;
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property Is64Bit: boolean read FIs64Bit;
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end;
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{ TElfDbgSource }
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TElfDbgSource = class(TDbgImageReader) // executable parser
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private
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FSections: TStringList;
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FFileLoader : TDbgFileLoader;
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fOwnSource : Boolean;
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fElfFile : TElfFile;
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protected
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function GetSection(const AName: String): PDbgImageSection; override;
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public
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class function isValid(ASource: TDbgFileLoader): Boolean; override;
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class function UserName: AnsiString; override;
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constructor Create(ASource: TDbgFileLoader; ADebugMap: TObject; OwnSource: Boolean); override;
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destructor Destroy; override;
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procedure ParseSymbolTable(AFpSymbolInfo: TfpSymbolList); override;
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//function GetSectionInfo(const SectionName: AnsiString; var Size: int64): Boolean; override;
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//function GetSectionData(const SectionName: AnsiString; Offset, Size: Int64; var Buf: array of byte): Int64; override;
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end;
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implementation
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type
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TElf32symbol=record
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st_name : longword;
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st_value : longword;
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st_size : longword;
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st_info : byte; { bit 0-3: type, 4-7: bind }
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st_other : byte;
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st_shndx : word;
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end;
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PElf32symbolArray = ^TElf32symbolArray;
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TElf32symbolArray = array[0..maxSmallint] of TElf32symbol;
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TElf64symbol=record
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st_name : longword;
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st_info : byte; { bit 0-3: type, 4-7: bind }
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st_other : byte;
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st_shndx : word;
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st_value : qword;
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st_size : qword;
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end;
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PElf64symbolArray = ^TElf64symbolArray;
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TElf64symbolArray = array[0..maxSmallint] of TElf64symbol;
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const
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// Symbol-map section name
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_symbol = '.symtab';
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_symbolstrings = '.strtab';
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{ TElfFile }
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function TElfFile.Load32BitFile(ALoader: TDbgFileLoader): Boolean;
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var
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hdr : Elf32_Ehdr;
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sect : array of Elf32_shdr;
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i, j : integer;
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nm : string;
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sz : LongWord;
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strs : array of byte;
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begin
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Result := ALoader.Read(0, sizeof(hdr), @hdr) = sizeof(hdr);
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if not Result then Exit;
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SetLength(sect, hdr.e_shnum);
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//ALoader.Position := hdr.e_shoff;
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sz := hdr.e_shetsize * hdr.e_shnum;
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if sz > LongWord(length(sect)*sizeof(Elf32_shdr)) then begin
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debugln(['TElfFile.Load64BitFile Size of SectHdrs is ', sz, ' expected ', LongWord(length(sect)*sizeof(Elf32_shdr))]);
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sz := LongWord(length(sect)*sizeof(Elf32_shdr));
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end;
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//ALoader.Read(sect[0], sz);
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ALoader.Read(hdr.e_shoff, sz, @sect[0]);
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i := sect[hdr.e_shstrndx].sh_offset;
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j := sect[hdr.e_shstrndx].sh_size;
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SetLength(strs, j);
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//ALoader.Position:=i;
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//ALoader.Read(strs[0], j);
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ALoader.Read(i, j, @strs[0]);
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for i := 0 to hdr.e_shnum - 1 do
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with sect[i] do begin
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nm := PChar( @strs[sh_name] );
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AddSection(nm, sh_offset, sh_addr, sh_size );
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end;
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end;
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function TElfFile.Load64BitFile(ALoader: TDbgFileLoader): Boolean;
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var
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hdr : Elf64_Ehdr;
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sect : array of Elf64_shdr;
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i, j : integer;
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nm : string;
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sz : LongWord;
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strs : array of byte;
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begin
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Result := ALoader.Read(0, sizeof(hdr), @hdr) = sizeof(hdr);
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if not Result then Exit;
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FIs64Bit:=true;
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SetLength(sect, hdr.e_shnum);
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//ALoader.Position := hdr.e_shoff;
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sz := hdr.e_shentsize * hdr.e_shnum;
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if sz > LongWord(length(sect)*sizeof(Elf64_shdr)) then begin
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debugln(['TElfFile.Load64BitFile Size of SectHdrs is ', sz, ' expected ', LongWord(length(sect)*sizeof(Elf64_shdr))]);
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sz := LongWord(length(sect)*sizeof(Elf64_shdr));
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end;
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//ALoader.Read(sect[0], sz);
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ALoader.Read(hdr.e_shoff, sz, @sect[0]);
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i := sect[hdr.e_shstrndx].sh_offset;
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j := sect[hdr.e_shstrndx].sh_size;
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SetLength(strs, j);
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//ALoader.Position:=i;
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//ALoader.Read(strs[0], j);
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ALoader.Read(i, j, @strs[0]);
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for i := 0 to hdr.e_shnum - 1 do
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with sect[i] do begin
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nm := PChar( @strs[sh_name] );
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AddSection(nm, sh_offset, sh_address, sh_size );
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end;
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Result := False;
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end;
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procedure TElfFile.AddSection(const name: AnsiString; FileOffset, Address,
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Size: Qword);
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begin
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if seccount=Length(sections) then begin
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if seccount = 0 then SetLength(sections, 4)
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else SetLength(sections, seccount*2);
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end;
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sections[seccount].Address:= Address;
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sections[seccount].name:=name;
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sections[seccount].FileOfs:=FileOffset;
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sections[seccount].Size:=Size;
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inc(seccount);
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end;
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function TElfFile.LoadFromFile(ALoader: TDbgFileLoader): Boolean;
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var
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ident : array [0..EINDENT-1] of byte;
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begin
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try
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Result := ALoader.Read(0, sizeof(ident), @ident[0]) = sizeof(ident);
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if not Result then Exit;
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Result := (ident[EI_MAG0] = $7f) and
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(ident[EI_MAG1] = byte('E')) and
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(ident[EI_MAG2] = byte('L')) and
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(ident[EI_MAG3] = byte('F'));
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if not Result then Exit;
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Result := False;
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if ident[EI_CLASS] = ELFCLASS32 then begin
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Result := Load32BitFile(ALoader);
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exit;
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end;
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if ident[EI_CLASS] = ELFCLASS64 then begin
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Result := Load64BitFile(ALoader);
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exit;
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end;
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except
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Result := false;
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end;
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end;
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function TElfFile.FindSection(const Name: String): Integer;
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var
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i : Integer;
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begin
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Result := -1;
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for i := 0 to seccount - 1 do
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if sections[i].name = Name then begin
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Result := i;
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Exit;
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end;
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end;
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{ TElfDbgSource }
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function TElfDbgSource.GetSection(const AName: String): PDbgImageSection;
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var
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i: Integer;
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ex: PDbgImageSectionEx;
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begin
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Result := nil;
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i := FSections.IndexOf(AName);
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if i < 0 then
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exit;
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ex := PDbgImageSectionEx(FSections.Objects[i]);
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Result := @ex^.Sect;
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if ex^.Loaded then
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exit;
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ex^.Loaded := True;
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FFileLoader.LoadMemory(ex^.Offs, Result^.Size, Result^.RawData);
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end;
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class function TElfDbgSource.isValid(ASource: TDbgFileLoader): Boolean;
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var
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buf : array [0..3+sizeof(Elf32_EHdr)] of byte;
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begin
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try
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Result := Assigned(ASource) and
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(ASource.Read(0, sizeof(Elf32_EHdr), @buf[0]) = sizeof(Elf32_EHdr));
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if not Result then Exit;
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Result := (buf[EI_MAG0] = $7f) and (buf[EI_MAG1] = byte('E')) and
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(buf[EI_MAG2] = byte('L')) and (buf[EI_MAG3] = byte('F'));
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except
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Result := false;
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end;
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end;
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class function TElfDbgSource.UserName: AnsiString;
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begin
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Result := 'ELF executable';
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end;
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constructor TElfDbgSource.Create(ASource: TDbgFileLoader; ADebugMap: TObject; OwnSource: Boolean);
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var
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p: PDbgImageSectionEx;
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idx: integer;
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i: Integer;
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fs: TElfSection;
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begin
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FSections := TStringList.Create;
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FSections.Sorted := True;
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//FSections.Duplicates := dupError;
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FSections.CaseSensitive := False;
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FFileLoader := ASource;
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fOwnSource := OwnSource;
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fElfFile := TElfFile.Create;
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fElfFile.LoadFromFile(ASource);
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for i := 0 to fElfFile.seccount - 1 do begin
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fs := fElfFile.sections[i];
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idx := FSections.AddObject(fs.name, nil);
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New(p);
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P^.Offs := fs.FileOfs;
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p^.Sect.Size := fs.Size;
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p^.Sect.VirtualAddress := 0; // Todo? fs.Address - ImageBase
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p^.Loaded := False;
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FSections.Objects[idx] := TObject(p);
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end;
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SetImage64Bit(fElfFile.Is64Bit);
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inherited Create(ASource, ADebugMap, OwnSource);
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end;
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destructor TElfDbgSource.Destroy;
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begin
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if fOwnSource then FFileLoader.Free;
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fElfFile.Free;
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while FSections.Count > 0 do begin
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Freemem(FSections.Objects[0]);
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FSections.Delete(0);
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end;
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FreeAndNil(FSections);
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inherited Destroy;
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end;
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procedure TElfDbgSource.ParseSymbolTable(AFpSymbolInfo: TfpSymbolList);
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var
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p: PDbgImageSection;
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ps: PDbgImageSection;
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SymbolArr32: PElf32symbolArray;
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SymbolArr64: PElf64symbolArray;
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SymbolStr: pointer;
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i: integer;
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SymbolCount: integer;
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SymbolName: AnsiString;
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begin
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p := Section[_symbol];
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ps := Section[_symbolstrings];
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if assigned(p) and assigned(ps) then
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begin
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SymbolStr:=PDbgImageSectionEx(ps)^.Sect.RawData;
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if Image64Bit then
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begin
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SymbolArr64:=PDbgImageSectionEx(p)^.Sect.RawData;
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SymbolCount := PDbgImageSectionEx(p)^.Sect.Size div sizeof(TElf64symbol);
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for i := 0 to SymbolCount-1 do
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begin
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begin
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{$push}
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{$R-}
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if SymbolArr64^[i].st_name<>0 then
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begin
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SymbolName:=pchar(SymbolStr+SymbolArr64^[i].st_name);
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AfpSymbolInfo.AddObject(SymbolName, TObject(PtrUInt(SymbolArr64^[i].st_value+ImageBase)));
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end;
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{$pop}
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end
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end;
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end
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else
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begin
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SymbolArr32:=PDbgImageSectionEx(p)^.Sect.RawData;
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SymbolCount := PDbgImageSectionEx(p)^.Sect.Size div sizeof(TElf32symbol);
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for i := 0 to SymbolCount-1 do
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begin
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begin
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if SymbolArr32^[i].st_name<>0 then
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begin
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SymbolName:=pchar(SymbolStr+SymbolArr32^[i].st_name);
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AfpSymbolInfo.AddObject(SymbolName, TObject(PtrUInt(SymbolArr32^[i].st_value+ImageBase)));
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end;
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end
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end;
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end;
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end;
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end;
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initialization
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RegisterImageReaderClass( TElfDbgSource );
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end.
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