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https://gitlab.com/freepascal.org/fpc/source.git
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1311 lines
43 KiB
ObjectPascal
1311 lines
43 KiB
ObjectPascal
{
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Copyright (c) 1998-2006 by Peter Vreman
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Contains the binary elf writer
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This program 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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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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unit ogelf;
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{$i fpcdefs.inc}
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interface
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uses
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{ common }
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cclasses,globtype,
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{ target }
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systems,
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{ assembler }
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cpuinfo,cpubase,aasmbase,aasmtai,aasmdata,assemble,
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{ output }
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ogbase,
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owbase;
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type
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TElfObjSection = class(TObjSection)
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public
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secshidx : longint; { index for the section in symtab }
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shstridx,
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shtype,
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shflags,
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shlink,
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shinfo,
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shentsize : longint;
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constructor create(AList:TFPHashObjectList;const Aname:string;Aalign:shortint;Aoptions:TObjSectionOptions);override;
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constructor create_ext(AList:TFPHashObjectList;const Aname:string;Ashtype,Ashflags,Ashlink,Ashinfo:longint;Aalign:shortint;Aentsize:longint);
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destructor destroy;override;
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end;
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TElfObjData = class(TObjData)
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public
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constructor create(const n:string);override;
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destructor destroy;override;
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function sectionname(atype:TAsmSectiontype;const aname:string;aorder:TAsmSectionOrder):string;override;
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procedure CreateDebugSections;override;
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procedure writereloc(data:aint;len:aword;p:TObjSymbol;reltype:TObjRelocationType);override;
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end;
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TElfObjectOutput = class(tObjOutput)
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private
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symtabsect,
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strtabsect,
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shstrtabsect: TElfObjSection;
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{gotpcsect,
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gotoffsect,
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goTSect,
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plTSect,
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symsect : TElfObjSection;}
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elf32data : TElfObjData;
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symidx,
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localsyms : longint;
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procedure createrelocsection(s:TElfObjSection);
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procedure createshstrtab;
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procedure createsymtab;
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procedure writesectionheader(s:TElfObjSection);
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procedure writesectiondata(s:TElfObjSection);
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procedure write_internal_symbol(astridx:longint;ainfo:byte;ashndx:word);
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procedure section_write_symbol(p:TObject;arg:pointer);
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procedure section_write_sh_string(p:TObject;arg:pointer);
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procedure section_count_sections(p:TObject;arg:pointer);
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procedure section_create_relocsec(p:TObject;arg:pointer);
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procedure section_set_datapos(p:TObject;arg:pointer);
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procedure section_write_data(p:TObject;arg:pointer);
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procedure section_write_sechdr(p:TObject;arg:pointer);
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protected
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function writedata(data:TObjData):boolean;override;
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public
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constructor Create(AWriter:TObjectWriter);override;
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destructor Destroy;override;
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end;
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TElfAssembler = class(tinternalassembler)
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constructor create(smart:boolean);override;
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end;
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implementation
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uses
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SysUtils,
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verbose,
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cutils,globals,fmodule;
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const
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symbolresize = 200*18;
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const
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{ Relocation types }
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{$ifdef i386}
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R_386_32 = 1; { ordinary absolute relocation }
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R_386_PC32 = 2; { PC-relative relocation }
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R_386_GOT32 = 3; { an offset into GOT }
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R_386_PLT32 = 4; { a PC-relative offset into PLT }
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R_386_GOTOFF = 9; { an offset from GOT base }
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R_386_GOTPC = 10; { a PC-relative offset _to_ GOT }
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R_386_GNU_VTINHERIT = 250;
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R_386_GNU_VTENTRY = 251;
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{$endif i386}
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{$ifdef sparc}
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R_SPARC_32 = 3;
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R_SPARC_WDISP30 = 7;
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R_SPARC_HI22 = 9;
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R_SPARC_LO10 = 12;
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R_SPARC_GNU_VTINHERIT = 250;
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R_SPARC_GNU_VTENTRY = 251;
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{$endif sparc}
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{$ifdef x86_64}
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R_X86_64_NONE = 0;
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{ Direct 64 bit }
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R_X86_64_64 = 1;
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{ PC relative 32 bit signed }
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R_X86_64_PC32 = 2;
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{ 32 bit GOT entry }
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R_X86_64_GOT32 = 3;
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{ 32 bit PLT address }
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R_X86_64_PLT32 = 4;
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{ Copy symbol at runtime }
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R_X86_64_COPY = 5;
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{ Create GOT entry }
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R_X86_64_GLOB_DAT = 6;
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{ Create PLT entry }
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R_X86_64_JUMP_SLOT = 7;
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{ Adjust by program base }
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R_X86_64_RELATIVE = 8;
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{ 32 bit signed PC relative offset to GOT }
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R_X86_64_GOTPCREL = 9;
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{ Direct 32 bit zero extended }
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R_X86_64_32 = 10;
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{ Direct 32 bit sign extended }
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R_X86_64_32S = 11;
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{ Direct 16 bit zero extended }
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R_X86_64_16 = 12;
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{ 16 bit sign extended PC relative }
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R_X86_64_PC16 = 13;
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{ Direct 8 bit sign extended }
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R_X86_64_8 = 14;
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{ 8 bit sign extended PC relative }
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R_X86_64_PC8 = 15;
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{ ID of module containing symbol }
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R_X86_64_DTPMOD64 = 16;
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{ Offset in module's TLS block }
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R_X86_64_DTPOFF64 = 17;
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{ Offset in initial TLS block }
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R_X86_64_TPOFF64 = 18;
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{ 32 bit signed PC relative offset to two GOT entries for GD symbol }
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R_X86_64_TLSGD = 19;
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{ 32 bit signed PC relative offset to two GOT entries for LD symbol }
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R_X86_64_TLSLD = 20;
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{ Offset in TLS block }
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R_X86_64_DTPOFF32 = 21;
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{ 32 bit signed PC relative offset to GOT entry for IE symbol }
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R_X86_64_GOTTPOFF = 22;
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{ Offset in initial TLS block }
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R_X86_64_TPOFF32 = 23;
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{ GNU extension to record C++ vtable hierarchy }
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R_X86_64_GNU_VTINHERIT = 24;
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{ GNU extension to record C++ vtable member usage }
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R_X86_64_GNU_VTENTRY = 25;
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{$endif x86_64}
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SHN_UNDEF = 0;
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SHN_ABS = $fff1;
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SHN_COMMON = $fff2;
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SHT_NULL = 0;
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SHT_PROGBITS = 1;
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SHT_SYMTAB = 2;
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SHT_STRTAB = 3;
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SHT_RELA = 4;
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SHT_HASH = 5;
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SHT_DYNAMIC = 6;
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SHT_NOTE = 7;
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SHT_NOBITS = 8;
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SHT_REL = 9;
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SHT_SHLIB = 10;
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SHT_DYNSYM = 11;
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SHF_WRITE = 1;
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SHF_ALLOC = 2;
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SHF_EXECINSTR = 4;
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STB_LOCAL = 0;
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STB_GLOBAL = 1;
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STB_WEAK = 2;
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STT_NOTYPE = 0;
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STT_OBJECT = 1;
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STT_FUNC = 2;
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STT_SECTION = 3;
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STT_FILE = 4;
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type
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{ Structures which are written directly to the output file }
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TElf32header=packed record
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magic0123 : longint;
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file_class : byte;
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data_encoding : byte;
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file_version : byte;
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padding : array[$07..$0f] of byte;
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e_type : word;
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e_machine : word;
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e_version : longint;
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e_entry : longint; { entrypoint }
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e_phoff : longint; { program header offset }
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e_shoff : longint; { sections header offset }
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e_flags : longint;
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e_ehsize : word; { elf header size in bytes }
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e_phentsize : word; { size of an entry in the program header array }
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e_phnum : word; { 0..e_phnum-1 of entrys }
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e_shentsize : word; { size of an entry in sections header array }
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e_shnum : word; { 0..e_shnum-1 of entrys }
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e_shstrndx : word; { index of string section header }
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end;
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TElf32sechdr=packed record
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sh_name : longint;
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sh_type : longint;
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sh_flags : longint;
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sh_addr : longint;
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sh_offset : longint;
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sh_size : longint;
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sh_link : longint;
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sh_info : longint;
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sh_addralign : longint;
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sh_entsize : longint;
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end;
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TElf32reloc=packed record
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address : longint;
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info : longint; { bit 0-7: type, 8-31: symbol }
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end;
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TElf32symbol=packed record
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st_name : longint;
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st_value : longint;
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st_size : longint;
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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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telf64header=packed record
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magic0123 : longint;
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file_class : byte;
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data_encoding : byte;
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file_version : byte;
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padding : array[$07..$0f] of byte;
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e_type : word;
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e_machine : word;
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e_version : longint;
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e_entry : qword; { entrypoint }
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e_phoff : qword; { program header offset }
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e_shoff : qword; { sections header offset }
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e_flags : longint;
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e_ehsize : word; { elf header size in bytes }
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e_phentsize : word; { size of an entry in the program header array }
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e_phnum : word; { 0..e_phnum-1 of entrys }
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e_shentsize : word; { size of an entry in sections header array }
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e_shnum : word; { 0..e_shnum-1 of entrys }
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e_shstrndx : word; { index of string section header }
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end;
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telf64sechdr=packed record
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sh_name : longint;
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sh_type : longint;
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sh_flags : qword;
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sh_addr : qword;
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sh_offset : qword;
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sh_size : qword;
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sh_link : longint;
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sh_info : longint;
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sh_addralign : qword;
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sh_entsize : qword;
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end;
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telf64reloc=packed record
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address : qword;
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info : qword; { bit 0-31: type, 32-63: symbol }
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addend : int64; { signed! }
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end;
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telf64symbol=packed record
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st_name : longint;
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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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{$ifdef cpu64bitaddr}
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telfheader = telf64header;
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telfreloc = telf64reloc;
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telfsymbol = telf64symbol;
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telfsechdr = telf64sechdr;
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{$else cpu64bitaddr}
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telfheader = telf32header;
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telfreloc = telf32reloc;
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telfsymbol = telf32symbol;
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telfsechdr = telf32sechdr;
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{$endif cpu64bitaddr}
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function MayBeSwapHeader(h : telf32header) : telf32header;
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begin
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result:=h;
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if source_info.endian<>target_info.endian then
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with h do
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begin
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result.e_type:=swapendian(e_type);
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result.e_machine:=swapendian(e_machine);
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result.e_version:=swapendian(e_version);
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result.e_entry:=swapendian(e_entry);
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result.e_phoff:=swapendian(e_phoff);
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result.e_shoff:=swapendian(e_shoff);
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result.e_flags:=swapendian(e_flags);
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result.e_ehsize:=swapendian(e_ehsize);
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result.e_phentsize:=swapendian(e_phentsize);
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result.e_phnum:=swapendian(e_phnum);
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result.e_shentsize:=swapendian(e_shentsize);
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result.e_shnum:=swapendian(e_shnum);
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result.e_shstrndx:=swapendian(e_shstrndx);
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end;
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end;
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function MayBeSwapHeader(h : telf64header) : telf64header;
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begin
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result:=h;
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if source_info.endian<>target_info.endian then
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with h do
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begin
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result.e_type:=swapendian(e_type);
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result.e_machine:=swapendian(e_machine);
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result.e_version:=swapendian(e_version);
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result.e_entry:=swapendian(e_entry);
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result.e_phoff:=swapendian(e_phoff);
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result.e_shoff:=swapendian(e_shoff);
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result.e_flags:=swapendian(e_flags);
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result.e_ehsize:=swapendian(e_ehsize);
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result.e_phentsize:=swapendian(e_phentsize);
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result.e_phnum:=swapendian(e_phnum);
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result.e_shentsize:=swapendian(e_shentsize);
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result.e_shnum:=swapendian(e_shnum);
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result.e_shstrndx:=swapendian(e_shstrndx);
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end;
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end;
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function MaybeSwapSecHeader(h : telf32sechdr) : telf32sechdr;
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begin
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result:=h;
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if source_info.endian<>target_info.endian then
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with h do
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begin
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result.sh_name:=swapendian(sh_name);
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result.sh_type:=swapendian(sh_type);
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result.sh_flags:=swapendian(sh_flags);
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result.sh_addr:=swapendian(sh_addr);
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result.sh_offset:=swapendian(sh_offset);
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result.sh_size:=swapendian(sh_size);
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result.sh_link:=swapendian(sh_link);
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result.sh_info:=swapendian(sh_info);
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result.sh_addralign:=swapendian(sh_addralign);
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result.sh_entsize:=swapendian(sh_entsize);
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end;
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end;
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function MaybeSwapSecHeader(h : telf64sechdr) : telf64sechdr;
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begin
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result:=h;
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if source_info.endian<>target_info.endian then
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with h do
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begin
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result.sh_name:=swapendian(sh_name);
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result.sh_type:=swapendian(sh_type);
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result.sh_flags:=swapendian(sh_flags);
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result.sh_addr:=swapendian(sh_addr);
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result.sh_offset:=swapendian(sh_offset);
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result.sh_size:=swapendian(sh_size);
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result.sh_link:=swapendian(sh_link);
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result.sh_info:=swapendian(sh_info);
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result.sh_addralign:=swapendian(sh_addralign);
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result.sh_entsize:=swapendian(sh_entsize);
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end;
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end;
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function MaybeSwapElfSymbol(h : telf32symbol) : telf32symbol;
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begin
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result:=h;
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if source_info.endian<>target_info.endian then
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with h do
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begin
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result.st_name:=swapendian(st_name);
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result.st_value:=swapendian(st_value);
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result.st_size:=swapendian(st_size);
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result.st_shndx:=swapendian(st_shndx);
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end;
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end;
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function MaybeSwapElfSymbol(h : telf64symbol) : telf64symbol;
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begin
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result:=h;
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if source_info.endian<>target_info.endian then
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with h do
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begin
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result.st_name:=swapendian(st_name);
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result.st_value:=swapendian(st_value);
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result.st_size:=swapendian(st_size);
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result.st_shndx:=swapendian(st_shndx);
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end;
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end;
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function MaybeSwapElfReloc(h : telf32reloc) : telf32reloc;
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begin
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result:=h;
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if source_info.endian<>target_info.endian then
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with h do
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begin
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result.address:=swapendian(address);
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result.info:=swapendian(info);
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end;
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end;
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function MaybeSwapElfReloc(h : telf64reloc) : telf64reloc;
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begin
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result:=h;
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if source_info.endian<>target_info.endian then
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with h do
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begin
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result.address:=swapendian(address);
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result.info:=swapendian(info);
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end;
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end;
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|
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{****************************************************************************
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Helpers
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****************************************************************************}
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|
|
|
procedure encodesechdrflags(aoptions:TObjSectionOptions;out AshType:longint;out Ashflags:longint);
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begin
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{ Section Type }
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AshType:=SHT_PROGBITS;
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if oso_strings in aoptions then
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AshType:=SHT_STRTAB
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else if not(oso_data in aoptions) then
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AshType:=SHT_NOBITS;
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{ Section Flags }
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Ashflags:=0;
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if oso_load in aoptions then
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Ashflags:=Ashflags or SHF_ALLOC;
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if oso_executable in aoptions then
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Ashflags:=Ashflags or SHF_EXECINSTR;
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if oso_write in aoptions then
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Ashflags:=Ashflags or SHF_WRITE;
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end;
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|
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procedure decodesechdrflags(AshType:longint;Ashflags:longint;out aoptions:TObjSectionOptions);
|
|
begin
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aoptions:=[];
|
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{ Section Type }
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|
if AshType<>SHT_NOBITS then
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include(aoptions,oso_data);
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if AshType=SHT_STRTAB then
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include(aoptions,oso_strings);
|
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{ Section Flags }
|
|
if Ashflags and SHF_ALLOC<>0 then
|
|
include(aoptions,oso_load)
|
|
else
|
|
include(aoptions,oso_noload);
|
|
if Ashflags and SHF_WRITE<>0 then
|
|
include(aoptions,oso_write)
|
|
else
|
|
include(aoptions,oso_readonly);
|
|
end;
|
|
|
|
|
|
{****************************************************************************
|
|
TSection
|
|
****************************************************************************}
|
|
|
|
constructor TElfObjSection.create(AList:TFPHashObjectList;const Aname:string;Aalign:shortint;Aoptions:TObjSectionOptions);
|
|
begin
|
|
inherited create(AList,Aname,Aalign,aoptions);
|
|
secshidx:=0;
|
|
shstridx:=0;
|
|
encodesechdrflags(aoptions,shtype,shflags);
|
|
shlink:=0;
|
|
shinfo:=0;
|
|
if name='.stab' then
|
|
shentsize:=sizeof(TObjStabEntry);
|
|
end;
|
|
|
|
|
|
constructor TElfObjSection.create_ext(AList:TFPHashObjectList;const Aname:string;Ashtype,Ashflags,Ashlink,Ashinfo:longint;Aalign:shortint;Aentsize:longint);
|
|
var
|
|
aoptions : TObjSectionOptions;
|
|
begin
|
|
decodesechdrflags(Ashtype,Ashflags,aoptions);
|
|
inherited create(AList,Aname,Aalign,aoptions);
|
|
secshidx:=0;
|
|
shstridx:=0;
|
|
shtype:=AshType;
|
|
shflags:=AshFlags;
|
|
shlink:=Ashlink;
|
|
shinfo:=Ashinfo;
|
|
shentsize:=Aentsize;
|
|
end;
|
|
|
|
|
|
destructor TElfObjSection.destroy;
|
|
begin
|
|
inherited destroy;
|
|
end;
|
|
|
|
|
|
{****************************************************************************
|
|
TElfObjData
|
|
****************************************************************************}
|
|
|
|
constructor TElfObjData.create(const n:string);
|
|
var
|
|
need_datarel : boolean;
|
|
begin
|
|
inherited create(n);
|
|
CObjSection:=TElfObjSection;
|
|
{ we need at least the following sections }
|
|
createsection(sec_code);
|
|
if (cs_create_pic in current_settings.moduleswitches) and
|
|
not(target_info.system in systems_darwin) then
|
|
begin
|
|
{ We still need an empty data section }
|
|
system.exclude(current_settings.moduleswitches,cs_create_pic);
|
|
need_datarel:=true;
|
|
end
|
|
else
|
|
need_datarel:=false;
|
|
createsection(sec_data);
|
|
if need_datarel then
|
|
system.include(current_settings.moduleswitches,cs_create_pic);
|
|
createsection(sec_bss);
|
|
if need_datarel then
|
|
createsection(sec_data);
|
|
if tf_section_threadvars in target_info.flags then
|
|
createsection(sec_threadvar);
|
|
if (tf_needs_dwarf_cfi in target_info.flags) and
|
|
(af_supports_dwarf in target_asm.flags) then
|
|
createsection(sec_debug_frame);
|
|
end;
|
|
|
|
|
|
destructor TElfObjData.destroy;
|
|
begin
|
|
inherited destroy;
|
|
end;
|
|
|
|
|
|
function TElfObjData.sectionname(atype:TAsmSectiontype;const aname:string;aorder:TAsmSectionOrder):string;
|
|
const
|
|
secnames : array[TAsmSectiontype] of string[length('__DATA, __datacoal_nt,coalesced')] = ('','',
|
|
{$ifdef userodata}
|
|
'.text','.data','.data','.rodata','.bss','.threadvar',
|
|
{$else userodata}
|
|
'.text','.data','.data','.data','.bss','.threadvar',
|
|
{$endif userodata}
|
|
'.pdata',
|
|
'.text', { darwin stubs }
|
|
'__DATA,__nl_symbol_ptr',
|
|
'__DATA,__la_symbol_ptr',
|
|
'__DATA,__mod_init_func',
|
|
'__DATA,__mod_term_func',
|
|
'.stab','.stabstr',
|
|
'.idata$2','.idata$4','.idata$5','.idata$6','.idata$7','.edata',
|
|
'.eh_frame',
|
|
'.debug_frame','.debug_info','.debug_line','.debug_abbrev',
|
|
'.fpc',
|
|
'.toc',
|
|
'.init',
|
|
'.fini',
|
|
'.objc_class',
|
|
'.objc_meta_class',
|
|
'.objc_cat_cls_meth',
|
|
'.objc_cat_inst_meth',
|
|
'.objc_protocol',
|
|
'.objc_string_object',
|
|
'.objc_cls_meth',
|
|
'.objc_inst_meth',
|
|
'.objc_cls_refs',
|
|
'.objc_message_refs',
|
|
'.objc_symbols',
|
|
'.objc_category',
|
|
'.objc_class_vars',
|
|
'.objc_instance_vars',
|
|
'.objc_module_info',
|
|
'.objc_class_names',
|
|
'.objc_meth_var_types',
|
|
'.objc_meth_var_names',
|
|
'.objc_selector_strs',
|
|
'.objc_protocol_ext',
|
|
'.objc_class_ext',
|
|
'.objc_property',
|
|
'.objc_image_info',
|
|
'.objc_cstring_object',
|
|
'.objc_sel_fixup',
|
|
'__DATA,__objc_data',
|
|
'__DATA,__objc_const',
|
|
'.objc_superrefs',
|
|
'__DATA, __datacoal_nt,coalesced',
|
|
'.objc_classlist',
|
|
'.objc_nlclasslist',
|
|
'.objc_catlist',
|
|
'.obcj_nlcatlist',
|
|
'.objc_protolist'
|
|
);
|
|
secnames_pic : array[TAsmSectiontype] of string[length('__DATA, __datacoal_nt,coalesced')] = ('','',
|
|
'.text',
|
|
'.data.rel',
|
|
'.data.rel',
|
|
'.data.rel',
|
|
'.bss',
|
|
'.threadvar',
|
|
'.pdata',
|
|
'', { stubs }
|
|
'__DATA,__nl_symbol_ptr',
|
|
'__DATA,__la_symbol_ptr',
|
|
'__DATA,__mod_init_func',
|
|
'__DATA,__mod_term_func',
|
|
'.stab',
|
|
'.stabstr',
|
|
'.idata$2','.idata$4','.idata$5','.idata$6','.idata$7','.edata',
|
|
'.eh_frame',
|
|
'.debug_frame','.debug_info','.debug_line','.debug_abbrev',
|
|
'.fpc',
|
|
'.toc',
|
|
'.init',
|
|
'.fini',
|
|
'.objc_class',
|
|
'.objc_meta_class',
|
|
'.objc_cat_cls_meth',
|
|
'.objc_cat_inst_meth',
|
|
'.objc_protocol',
|
|
'.objc_string_object',
|
|
'.objc_cls_meth',
|
|
'.objc_inst_meth',
|
|
'.objc_cls_refs',
|
|
'.objc_message_refs',
|
|
'.objc_symbols',
|
|
'.objc_category',
|
|
'.objc_class_vars',
|
|
'.objc_instance_vars',
|
|
'.objc_module_info',
|
|
'.objc_class_names',
|
|
'.objc_meth_var_types',
|
|
'.objc_meth_var_names',
|
|
'.objc_selector_strs',
|
|
'.objc_protocol_ext',
|
|
'.objc_class_ext',
|
|
'.objc_property',
|
|
'.objc_image_info',
|
|
'.objc_cstring_object',
|
|
'.objc_sel_fixup',
|
|
'__DATA,__objc_data',
|
|
'__DATA,__objc_const',
|
|
'.objc_superrefs',
|
|
'__DATA, __datacoal_nt,coalesced',
|
|
'.objc_classlist',
|
|
'.objc_nlclasslist',
|
|
'.objc_catlist',
|
|
'.obcj_nlcatlist',
|
|
'.objc_protolist'
|
|
);
|
|
var
|
|
sep : string[3];
|
|
secname : string;
|
|
begin
|
|
{ section type user gives the user full controll on the section name }
|
|
if atype=sec_user then
|
|
result:=aname
|
|
else
|
|
begin
|
|
if (cs_create_pic in current_settings.moduleswitches) and
|
|
not(target_info.system in systems_darwin) then
|
|
secname:=secnames_pic[atype]
|
|
else
|
|
secname:=secnames[atype];
|
|
if (atype=sec_fpc) and (Copy(aname,1,3)='res') then
|
|
begin
|
|
result:=secname+'.'+aname;
|
|
exit;
|
|
end;
|
|
if create_smartlink_sections and (aname<>'') then
|
|
begin
|
|
case aorder of
|
|
secorder_begin :
|
|
sep:='.b_';
|
|
secorder_end :
|
|
sep:='.z_';
|
|
else
|
|
sep:='.n_';
|
|
end;
|
|
result:=secname+sep+aname
|
|
end
|
|
else
|
|
result:=secname;
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure TElfObjData.CreateDebugSections;
|
|
begin
|
|
if target_dbg.id=dbg_stabs then
|
|
begin
|
|
stabssec:=createsection(sec_stab);
|
|
stabstrsec:=createsection(sec_stabstr);
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure TElfObjData.writereloc(data:aint;len:aword;p:TObjSymbol;reltype:TObjRelocationType);
|
|
var
|
|
symaddr : aint;
|
|
begin
|
|
if CurrObjSec=nil then
|
|
internalerror(200403292);
|
|
{$ifdef userodata}
|
|
if CurrObjSec.sectype in [sec_rodata,sec_bss,sec_threadvar] then
|
|
internalerror(200408252);
|
|
{$endif userodata}
|
|
if assigned(p) then
|
|
begin
|
|
{ real address of the symbol }
|
|
symaddr:=p.address;
|
|
{ Local ObjSymbols can be resolved already or need a section reloc }
|
|
if (p.bind=AB_LOCAL) and
|
|
(reltype in [RELOC_RELATIVE,RELOC_ABSOLUTE{$ifdef x86_64},RELOC_ABSOLUTE32{$endif x86_64}]) then
|
|
begin
|
|
{ For a reltype relocation in the same section the
|
|
value can be calculated }
|
|
if (p.objsection=CurrObjSec) and
|
|
(reltype=RELOC_RELATIVE) then
|
|
inc(data,symaddr-len-CurrObjSec.Size)
|
|
else
|
|
begin
|
|
CurrObjSec.addsectionreloc(CurrObjSec.Size,p.objsection,reltype);
|
|
inc(data,symaddr);
|
|
end;
|
|
end
|
|
else
|
|
begin
|
|
CurrObjSec.addsymreloc(CurrObjSec.Size,p,reltype);
|
|
{$ifndef x86_64}
|
|
if (reltype=RELOC_RELATIVE) or (reltype=RELOC_PLT32) then
|
|
dec(data,len);
|
|
{$endif x86_64}
|
|
end;
|
|
end;
|
|
CurrObjSec.write(data,len);
|
|
end;
|
|
|
|
|
|
{****************************************************************************
|
|
TElfObjectOutput
|
|
****************************************************************************}
|
|
|
|
constructor TElfObjectOutput.create(AWriter:TObjectWriter);
|
|
begin
|
|
inherited Create(AWriter);
|
|
CObjData:=TElfObjData;
|
|
end;
|
|
|
|
|
|
destructor TElfObjectOutput.destroy;
|
|
begin
|
|
inherited destroy;
|
|
end;
|
|
|
|
|
|
procedure TElfObjectOutput.createrelocsection(s:TElfObjSection);
|
|
var
|
|
i : longint;
|
|
rel : telfreloc;
|
|
objreloc : TObjRelocation;
|
|
relsym,
|
|
reltyp : longint;
|
|
relocsect : TObjSection;
|
|
tmp: aint;
|
|
asize: longint;
|
|
begin
|
|
with elf32data do
|
|
begin
|
|
{$ifdef userodata}
|
|
{ rodata can't have relocations }
|
|
if s.sectype=sec_rodata then
|
|
begin
|
|
if assigned(s.relocations.first) then
|
|
internalerror(200408251);
|
|
exit;
|
|
end;
|
|
{$endif userodata}
|
|
{ create the reloc section }
|
|
{$ifdef i386}
|
|
relocsect:=TElfObjSection.create_ext(ObjSectionList,'.rel'+s.name,SHT_REL,0,symtabsect.secshidx,s.secshidx,4,sizeof(TElfReloc));
|
|
{$else i386}
|
|
relocsect:=TElfObjSection.create_ext(ObjSectionList,'.rela'+s.name,SHT_RELA,0,symtabsect.secshidx,s.secshidx,4,sizeof(TElfReloc));
|
|
{$endif i386}
|
|
{ add the relocations }
|
|
for i:=0 to s.Objrelocations.count-1 do
|
|
begin
|
|
objreloc:=TObjRelocation(s.Objrelocations[i]);
|
|
fillchar(rel,sizeof(rel),0);
|
|
rel.address:=objreloc.dataoffset;
|
|
|
|
{ when things settle down, we can create processor specific
|
|
derived classes }
|
|
case objreloc.typ of
|
|
{$ifdef i386}
|
|
RELOC_RELATIVE :
|
|
reltyp:=R_386_PC32;
|
|
RELOC_ABSOLUTE :
|
|
reltyp:=R_386_32;
|
|
RELOC_GOT32 :
|
|
reltyp:=R_386_GOT32;
|
|
RELOC_GOTPC :
|
|
reltyp:=R_386_GOTPC;
|
|
RELOC_PLT32 :
|
|
begin
|
|
reltyp:=R_386_PLT32;
|
|
end;
|
|
{$endif i386}
|
|
{$ifdef sparc}
|
|
RELOC_ABSOLUTE :
|
|
reltyp:=R_SPARC_32;
|
|
{$endif sparc}
|
|
{$ifdef x86_64}
|
|
RELOC_RELATIVE :
|
|
begin
|
|
reltyp:=R_X86_64_PC32;
|
|
{ length of the relocated location is handled here }
|
|
rel.addend:=-4;
|
|
end;
|
|
RELOC_ABSOLUTE :
|
|
reltyp:=R_X86_64_64;
|
|
RELOC_ABSOLUTE32 :
|
|
reltyp:=R_X86_64_32S;
|
|
RELOC_GOTPCREL :
|
|
begin
|
|
reltyp:=R_X86_64_GOTPCREL;
|
|
{ length of the relocated location is handled here }
|
|
rel.addend:=-4;
|
|
end;
|
|
RELOC_PLT32 :
|
|
begin
|
|
reltyp:=R_X86_64_PLT32;
|
|
{ length of the relocated location is handled here }
|
|
rel.addend:=-4;
|
|
end;
|
|
{$endif x86_64}
|
|
else
|
|
internalerror(200602261);
|
|
end;
|
|
|
|
{ This handles ELF 'rela'-styled relocations, which are currently used only for x86_64,
|
|
but can be used other targets, too. }
|
|
{$ifdef x86_64}
|
|
s.Data.Seek(objreloc.dataoffset);
|
|
if objreloc.typ=RELOC_ABSOLUTE then
|
|
begin
|
|
asize:=8;
|
|
s.Data.Read(tmp,8);
|
|
rel.addend:=rel.addend+tmp;
|
|
end
|
|
else
|
|
begin
|
|
asize:=4;
|
|
s.Data.Read(tmp,4);
|
|
rel.addend:=rel.addend+longint(tmp);
|
|
end;
|
|
|
|
{ and zero the data member out }
|
|
tmp:=0;
|
|
s.Data.Seek(objreloc.dataoffset);
|
|
s.Data.Write(tmp,asize);
|
|
{$endif}
|
|
|
|
{ Symbol }
|
|
if assigned(objreloc.symbol) then
|
|
begin
|
|
if objreloc.symbol.symidx=-1 then
|
|
begin
|
|
writeln(objreloc.symbol.Name);
|
|
internalerror(200603012);
|
|
end;
|
|
relsym:=objreloc.symbol.symidx;
|
|
end
|
|
else
|
|
begin
|
|
if objreloc.objsection<>nil then
|
|
relsym:=objreloc.objsection.secsymidx
|
|
else
|
|
relsym:=SHN_UNDEF;
|
|
end;
|
|
{$ifdef cpu64bitaddr}
|
|
rel.info:=(qword(relsym) shl 32) or reltyp;
|
|
{$else cpu64bitaddr}
|
|
rel.info:=(relsym shl 8) or reltyp;
|
|
{$endif cpu64bitaddr}
|
|
{ write reloc }
|
|
relocsect.write(MaybeSwapElfReloc(rel),sizeof(rel));
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure TElfObjectOutput.write_internal_symbol(astridx:longint;ainfo:byte;ashndx:word);
|
|
var
|
|
elfsym : telfsymbol;
|
|
begin
|
|
fillchar(elfsym,sizeof(elfsym),0);
|
|
elfsym.st_name:=astridx;
|
|
elfsym.st_info:=ainfo;
|
|
elfsym.st_shndx:=ashndx;
|
|
inc(symidx);
|
|
inc(localsyms);
|
|
symtabsect.write(MaybeSwapElfSymbol(elfsym),sizeof(elfsym));
|
|
end;
|
|
|
|
|
|
procedure TElfObjectOutput.section_write_symbol(p:TObject;arg:pointer);
|
|
begin
|
|
TObjSection(p).secsymidx:=symidx;
|
|
write_internal_symbol(TElfObjSection(p).shstridx,STT_SECTION,TElfObjSection(p).secshidx);
|
|
end;
|
|
|
|
|
|
procedure TElfObjectOutput.createsymtab;
|
|
|
|
procedure WriteSym(objsym:TObjSymbol);
|
|
var
|
|
elfsym : telfsymbol;
|
|
begin
|
|
with elf32data do
|
|
begin
|
|
fillchar(elfsym,sizeof(elfsym),0);
|
|
{ symbolname, write the #0 separate to overcome 255+1 char not possible }
|
|
elfsym.st_name:=strtabsect.Size;
|
|
strtabsect.writestr(objsym.name);
|
|
strtabsect.writestr(#0);
|
|
elfsym.st_size:=objsym.size;
|
|
case objsym.bind of
|
|
AB_LOCAL :
|
|
begin
|
|
elfsym.st_value:=objsym.address;
|
|
elfsym.st_info:=STB_LOCAL shl 4;
|
|
inc(localsyms);
|
|
end;
|
|
AB_COMMON :
|
|
begin
|
|
elfsym.st_value:=$10;
|
|
elfsym.st_info:=STB_GLOBAL shl 4;
|
|
end;
|
|
AB_EXTERNAL :
|
|
elfsym.st_info:=STB_GLOBAL shl 4;
|
|
AB_WEAK_EXTERNAL :
|
|
elfsym.st_info:=STB_WEAK shl 4;
|
|
AB_GLOBAL :
|
|
begin
|
|
elfsym.st_value:=objsym.address;
|
|
elfsym.st_info:=STB_GLOBAL shl 4;
|
|
end;
|
|
end;
|
|
if (objsym.bind<>AB_EXTERNAL) {and
|
|
not(assigned(objsym.objsection) and
|
|
not(oso_data in objsym.objsection.secoptions))} then
|
|
begin
|
|
case objsym.typ of
|
|
AT_FUNCTION :
|
|
elfsym.st_info:=elfsym.st_info or STT_FUNC;
|
|
AT_DATA :
|
|
elfsym.st_info:=elfsym.st_info or STT_OBJECT;
|
|
end;
|
|
end;
|
|
if objsym.bind=AB_COMMON then
|
|
elfsym.st_shndx:=SHN_COMMON
|
|
else
|
|
begin
|
|
if assigned(objsym.objsection) then
|
|
elfsym.st_shndx:=TElfObjSection(objsym.objsection).secshidx
|
|
else
|
|
elfsym.st_shndx:=SHN_UNDEF;
|
|
end;
|
|
objsym.symidx:=symidx;
|
|
inc(symidx);
|
|
symtabsect.write(MaybeSwapElfSymbol(elfsym),sizeof(elfsym));
|
|
end;
|
|
end;
|
|
|
|
var
|
|
i : longint;
|
|
objsym : TObjSymbol;
|
|
begin
|
|
with elf32data do
|
|
begin
|
|
symidx:=0;
|
|
localsyms:=0;
|
|
{ empty entry }
|
|
write_internal_symbol(0,0,0);
|
|
{ filename entry }
|
|
write_internal_symbol(1,STT_FILE,SHN_ABS);
|
|
{ section }
|
|
ObjSectionList.ForEachCall(@section_write_symbol,nil);
|
|
{ First the Local Symbols, this is required by ELF. The localsyms
|
|
count stored in shinfo is used to skip the local symbols
|
|
when traversing the symtab }
|
|
for i:=0 to ObjSymbolList.Count-1 do
|
|
begin
|
|
objsym:=TObjSymbol(ObjSymbolList[i]);
|
|
if (objsym.bind=AB_LOCAL) and (objsym.typ<>AT_LABEL) then
|
|
WriteSym(objsym);
|
|
end;
|
|
{ Global Symbols }
|
|
for i:=0 to ObjSymbolList.Count-1 do
|
|
begin
|
|
objsym:=TObjSymbol(ObjSymbolList[i]);
|
|
if (objsym.bind<>AB_LOCAL) then
|
|
WriteSym(objsym);
|
|
end;
|
|
{ update the .symtab section header }
|
|
symtabsect.shlink:=strtabsect.secshidx;
|
|
symtabsect.shinfo:=localsyms;
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure TElfObjectOutput.section_write_sh_string(p:TObject;arg:pointer);
|
|
begin
|
|
TElfObjSection(p).shstridx:=shstrtabsect.writestr(TObjSection(p).name+#0);
|
|
end;
|
|
|
|
|
|
procedure TElfObjectOutput.createshstrtab;
|
|
begin
|
|
with elf32data do
|
|
begin
|
|
shstrtabsect.writestr(#0);
|
|
ObjSectionList.ForEachCall(@section_write_sh_string,nil);
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure TElfObjectOutput.writesectionheader(s:TElfObjSection);
|
|
var
|
|
sechdr : telfsechdr;
|
|
begin
|
|
fillchar(sechdr,sizeof(sechdr),0);
|
|
sechdr.sh_name:=s.shstridx;
|
|
sechdr.sh_type:=s.shtype;
|
|
sechdr.sh_flags:=s.shflags;
|
|
sechdr.sh_offset:=s.datapos;
|
|
sechdr.sh_size:=s.Size;
|
|
sechdr.sh_link:=s.shlink;
|
|
sechdr.sh_info:=s.shinfo;
|
|
sechdr.sh_addralign:=s.secalign;
|
|
sechdr.sh_entsize:=s.shentsize;
|
|
writer.write(MaybeSwapSecHeader(sechdr),sizeof(sechdr));
|
|
end;
|
|
|
|
|
|
procedure TElfObjectOutput.writesectiondata(s:TElfObjSection);
|
|
begin
|
|
FWriter.writezeros(s.dataalignbytes);
|
|
if s.Datapos<>FWriter.ObjSize then
|
|
internalerror(200604031);
|
|
FWriter.writearray(s.data);
|
|
end;
|
|
|
|
|
|
procedure TElfObjectOutput.section_count_sections(p:TObject;arg:pointer);
|
|
begin
|
|
TElfObjSection(p).secshidx:=pword(arg)^;
|
|
inc(pword(arg)^);
|
|
end;
|
|
|
|
|
|
procedure TElfObjectOutput.section_create_relocsec(p:TObject;arg:pointer);
|
|
begin
|
|
if (TElfObjSection(p).ObjRelocations.count>0) then
|
|
createrelocsection(TElfObjSection(p));
|
|
end;
|
|
|
|
|
|
procedure TElfObjectOutput.section_set_datapos(p:TObject;arg:pointer);
|
|
begin
|
|
TObjSection(p).setdatapos(paword(arg)^);
|
|
end;
|
|
|
|
|
|
procedure TElfObjectOutput.section_write_data(p:TObject;arg:pointer);
|
|
begin
|
|
if (oso_data in TObjSection(p).secoptions) then
|
|
begin
|
|
if TObjSection(p).data=nil then
|
|
internalerror(200403073);
|
|
writesectiondata(TElfObjSection(p));
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure TElfObjectOutput.section_write_sechdr(p:TObject;arg:pointer);
|
|
begin
|
|
writesectionheader(TElfObjSection(p));
|
|
end;
|
|
|
|
|
|
function TElfObjectOutput.writedata(data:TObjData):boolean;
|
|
var
|
|
header : telfheader;
|
|
shoffset,
|
|
datapos : aint;
|
|
nsections : word;
|
|
begin
|
|
result:=false;
|
|
elf32data:=TElfObjData(data);
|
|
with elf32data do
|
|
begin
|
|
{ default sections }
|
|
symtabsect:=TElfObjSection.create_ext(ObjSectionList,'.symtab',SHT_SYMTAB,0,0,0,4,sizeof(telfsymbol));
|
|
strtabsect:=TElfObjSection.create_ext(ObjSectionList,'.strtab',SHT_STRTAB,0,0,0,1,0);
|
|
shstrtabsect:=TElfObjSection.create_ext(ObjSectionList,'.shstrtab',SHT_STRTAB,0,0,0,1,0);
|
|
{ "no executable stack" marker for Linux }
|
|
if (target_info.system in systems_linux) and
|
|
not(cs_executable_stack in current_settings.moduleswitches) then
|
|
TElfObjSection.create_ext(ObjSectionList,'.note.GNU-stack',SHT_PROGBITS,0,0,0,1,0);
|
|
{ insert the empty and filename as first in strtab }
|
|
strtabsect.writestr(#0);
|
|
strtabsect.writestr(ExtractFileName(current_module.mainsource^)+#0);
|
|
{ calc amount of sections we have }
|
|
nsections:=1;
|
|
{ also create the index in the section header table }
|
|
ObjSectionList.ForEachCall(@section_count_sections,@nsections);
|
|
{ create .symtab and .strtab }
|
|
createsymtab;
|
|
{ Create the relocation sections, this needs valid secidx and symidx }
|
|
ObjSectionList.ForEachCall(@section_create_relocsec,nil);
|
|
{ recalc nsections to incude the reloc sections }
|
|
nsections:=1;
|
|
ObjSectionList.ForEachCall(@section_count_sections,@nsections);
|
|
{ create .shstrtab }
|
|
createshstrtab;
|
|
|
|
{ Calculate the filepositions }
|
|
datapos:=$40; { elfheader + alignment }
|
|
{ section data }
|
|
ObjSectionList.ForEachCall(@section_set_datapos,@datapos);
|
|
{ section headers }
|
|
shoffset:=datapos;
|
|
inc(datapos,(nsections+1)*sizeof(telfsechdr));
|
|
|
|
{ Write ELF Header }
|
|
fillchar(header,sizeof(header),0);
|
|
header.magic0123:=$464c457f; { = #127'ELF' }
|
|
{$ifdef cpu64bitaddr}
|
|
header.file_class:=2;
|
|
{$else cpu64bitaddr}
|
|
header.file_class:=1;
|
|
{$endif cpu64bitaddr}
|
|
if target_info.endian=endian_big then
|
|
header.data_encoding:=2
|
|
else
|
|
header.data_encoding:=1;
|
|
|
|
header.file_version:=1;
|
|
header.e_type:=1;
|
|
{$ifdef sparc}
|
|
header.e_machine:=2;
|
|
{$endif sparc}
|
|
{$ifdef i386}
|
|
header.e_machine:=3;
|
|
{$endif i386}
|
|
{$ifdef m68k}
|
|
header.e_machine:=4;
|
|
{$endif m68k}
|
|
{$ifdef powerpc}
|
|
header.e_machine:=20;
|
|
{$endif powerpc}
|
|
{$ifdef arm}
|
|
header.e_machine:=40;
|
|
if (current_settings.fputype=cpu_soft) then
|
|
header.e_flags:=$600;
|
|
{$endif arm}
|
|
{$ifdef x86_64}
|
|
header.e_machine:=62;
|
|
{$endif x86_64}
|
|
header.e_version:=1;
|
|
header.e_shoff:=shoffset;
|
|
header.e_shstrndx:=shstrtabsect.secshidx;
|
|
|
|
header.e_shnum:=nsections;
|
|
header.e_ehsize:=sizeof(telfheader);
|
|
header.e_shentsize:=sizeof(telfsechdr);
|
|
writer.write(MaybeSwapHeader(header),sizeof(header));
|
|
writer.writezeros($40-sizeof(header)); { align }
|
|
{ Sections }
|
|
ObjSectionList.ForEachCall(@section_write_data,nil);
|
|
{ section headers, start with an empty header for sh_undef }
|
|
writer.writezeros(sizeof(telfsechdr));
|
|
ObjSectionList.ForEachCall(@section_write_sechdr,nil);
|
|
end;
|
|
result:=true;
|
|
end;
|
|
|
|
|
|
{****************************************************************************
|
|
TELFAssembler
|
|
****************************************************************************}
|
|
|
|
constructor TElfAssembler.Create(smart:boolean);
|
|
begin
|
|
inherited Create(smart);
|
|
CObjOutput:=TElfObjectOutput;
|
|
end;
|
|
|
|
|
|
{*****************************************************************************
|
|
Initialize
|
|
*****************************************************************************}
|
|
|
|
{$ifdef i386}
|
|
const
|
|
as_i386_elf32_info : tasminfo =
|
|
(
|
|
id : as_i386_elf32;
|
|
idtxt : 'ELF';
|
|
asmbin : '';
|
|
asmcmd : '';
|
|
supported_targets : [system_i386_linux,system_i386_beos,system_i386_freebsd,system_i386_haiku,system_i386_Netware,system_i386_netwlibc,
|
|
system_i386_solaris,system_i386_embedded];
|
|
flags : [af_outputbinary,af_smartlink_sections,af_supports_dwarf];
|
|
labelprefix : '.L';
|
|
comment : '';
|
|
);
|
|
{$endif i386}
|
|
{$ifdef x86_64}
|
|
const
|
|
as_x86_64_elf64_info : tasminfo =
|
|
(
|
|
id : as_x86_64_elf64;
|
|
idtxt : 'ELF';
|
|
asmbin : '';
|
|
asmcmd : '';
|
|
supported_targets : [system_x86_64_linux];
|
|
flags : [af_outputbinary,af_smartlink_sections,af_supports_dwarf];
|
|
labelprefix : '.L';
|
|
comment : '';
|
|
);
|
|
{$endif x86_64}
|
|
{$ifdef sparc}
|
|
const
|
|
as_sparc_elf32_info : tasminfo =
|
|
(
|
|
id : as_sparc_elf32;
|
|
idtxt : 'ELF';
|
|
asmbin : '';
|
|
asmcmd : '';
|
|
supported_targets : [];
|
|
// flags : [af_outputbinary,af_smartlink_sections];
|
|
flags : [af_outputbinary,af_supports_dwarf];
|
|
labelprefix : '.L';
|
|
comment : '';
|
|
);
|
|
{$endif sparc}
|
|
|
|
|
|
initialization
|
|
{$ifdef i386}
|
|
RegisterAssembler(as_i386_elf32_info,TElfAssembler);
|
|
{$endif i386}
|
|
{$ifdef sparc}
|
|
RegisterAssembler(as_sparc_elf32_info,TElfAssembler);
|
|
{$endif sparc}
|
|
{$ifdef x86_64}
|
|
RegisterAssembler(as_x86_64_elf64_info,TElfAssembler);
|
|
{$endif x86_64}
|
|
end.
|