mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-04-27 18:13:47 +02:00
785550d7e3
svn+ssh://peter@www.freepascal.org/FPC/svn/fpc/branches/linker/compiler ........ r2669 | peter | 2006-02-23 09:31:21 +0100 (Thu, 23 Feb 2006) | 2 lines * add compiler dir ........ r2673 | peter | 2006-02-23 17:08:56 +0100 (Thu, 23 Feb 2006) | 2 lines * enabled more code ........ r2677 | peter | 2006-02-24 17:46:29 +0100 (Fri, 24 Feb 2006) | 2 lines * pe stub and headers ........ r2683 | peter | 2006-02-25 23:13:24 +0100 (Sat, 25 Feb 2006) | 2 lines * section options cleanup ........ r2696 | peter | 2006-02-26 20:27:41 +0100 (Sun, 26 Feb 2006) | 2 lines * fixed typecasts ........ r2699 | peter | 2006-02-26 23:04:32 +0100 (Sun, 26 Feb 2006) | 2 lines * simple linking works ........ r2700 | peter | 2006-02-27 09:44:50 +0100 (Mon, 27 Feb 2006) | 2 lines * internal linker script ........ r2701 | peter | 2006-02-27 12:05:12 +0100 (Mon, 27 Feb 2006) | 2 lines * make elf working again ........ r2702 | peter | 2006-02-27 14:04:43 +0100 (Mon, 27 Feb 2006) | 3 lines * disable dwarf for smartlinking with .a * fix section start in new .a file ........ r2704 | peter | 2006-02-27 18:30:43 +0100 (Mon, 27 Feb 2006) | 2 lines * stab section fixes ........ r2708 | peter | 2006-02-28 19:29:17 +0100 (Tue, 28 Feb 2006) | 2 lines * basic work to merge stabs sections ........ r2712 | peter | 2006-02-28 23:17:48 +0100 (Tue, 28 Feb 2006) | 2 lines * unload tmodules before linking ........ r2713 | peter | 2006-02-28 23:18:51 +0100 (Tue, 28 Feb 2006) | 2 lines * fixed stabs linking ........ r2714 | peter | 2006-02-28 23:19:19 +0100 (Tue, 28 Feb 2006) | 2 lines * show code and data size ........ r2715 | peter | 2006-02-28 23:25:35 +0100 (Tue, 28 Feb 2006) | 2 lines * unload .stabs from objdata after it is merged ........ r2718 | peter | 2006-03-01 12:24:38 +0100 (Wed, 01 Mar 2006) | 3 lines * memsize/datasize cleanup * check for exports/resources when adding module to linker ........ r2722 | peter | 2006-03-03 09:12:20 +0100 (Fri, 03 Mar 2006) | 2 lines * new TObjSymbol splitted from TAsmSymbol ........ r2723 | peter | 2006-03-03 14:08:55 +0100 (Fri, 03 Mar 2006) | 2 lines * coff fixes after recent objsymbol changes ........ r2728 | peter | 2006-03-03 22:43:04 +0100 (Fri, 03 Mar 2006) | 2 lines * fixed coff writer ........ r2729 | peter | 2006-03-04 01:10:32 +0100 (Sat, 04 Mar 2006) | 2 lines * fix read-only opening ........ r2730 | peter | 2006-03-04 01:11:16 +0100 (Sat, 04 Mar 2006) | 2 lines * Read edata from DLLs, basic work ........ r2740 | peter | 2006-03-04 21:13:43 +0100 (Sat, 04 Mar 2006) | 3 lines * deletedef added * don't remove defs from index when we are already clearing everything ........ r2769 | peter | 2006-03-05 21:42:33 +0100 (Sun, 05 Mar 2006) | 4 lines * moved TObj classes to ogbase * ObjSection.SymbolRefs and SymbolDefines list * DLL importing ........ git-svn-id: trunk@2771 -
815 lines
27 KiB
ObjectPascal
815 lines
27 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,assemble,
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{ output }
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ogbase;
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type
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TElf32ObjSection = 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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{ relocation }
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relocsect : TElf32ObjSection;
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constructor create(const Aname:string;Aalign:shortint;Aoptions:TObjSectionOptions);override;
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constructor create_ext(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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TElf32ObjData = class(TObjData)
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public
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symtabsect,
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strtabsect,
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shstrtabsect,
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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 : TElf32ObjSection;
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syms : Tdynamicarray;
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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):string;override;
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function sectiontype2align(atype:TAsmSectiontype):shortint;override;
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procedure CreateDebugSections;override;
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procedure writereloc(data,len:aint;p:TObjSymbol;relative:TObjRelocationType);override;
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procedure writestab(offset:aint;ps:TObjSymbol;nidx,nother:byte;ndesc:word;p:pchar);override;
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end;
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TElf32ObjectOutput = class(tObjOutput)
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private
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elf32data : TElf32ObjData;
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symidx,
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localsyms : longint;
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procedure createrelocsection(s:TElf32ObjSection);
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procedure createshstrtab;
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procedure createsymtab;
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procedure writesectionheader(s:TElf32ObjSection);
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procedure writesectiondata(s:TElf32ObjSection);
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procedure section_write_symbol(p,arg:pointer);
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procedure section_write_sh_string(p,arg:pointer);
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procedure section_count_sections(p,arg:pointer);
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procedure section_create_relocsec(p,arg:pointer);
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procedure section_set_datapos(p,arg:pointer);
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procedure section_relocsec_set_datapos(p,arg:pointer);
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procedure section_write_data(p,arg:pointer);
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procedure section_write_sechdr(p,arg:pointer);
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procedure section_write_relocsec(p,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(smart:boolean);override;
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end;
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TElf32assembler = 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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strings,
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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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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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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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{****************************************************************************
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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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procedure decodesechdrflags(AshType:longint;Ashflags:longint;out aoptions:TObjSectionOptions);
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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 }
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if Ashflags and SHF_ALLOC<>0 then
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include(aoptions,oso_load)
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else
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include(aoptions,oso_noload);
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if Ashflags and SHF_WRITE<>0 then
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include(aoptions,oso_write)
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else
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include(aoptions,oso_readonly);
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end;
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{****************************************************************************
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TSection
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****************************************************************************}
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constructor TElf32ObjSection.create(const Aname:string;Aalign:shortint;Aoptions:TObjSectionOptions);
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begin
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inherited create(Aname,Aalign,aoptions);
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secshidx:=0;
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shstridx:=0;
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encodesechdrflags(aoptions,shtype,shflags);
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shlink:=0;
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shinfo:=0;
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if name='.stab' then
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shentsize:=sizeof(TObjStabEntry);
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relocsect:=nil;
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end;
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constructor TElf32ObjSection.create_ext(const Aname:string;Ashtype,Ashflags,Ashlink,Ashinfo:longint;Aalign:shortint;Aentsize:longint);
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var
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aoptions : TObjSectionOptions;
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begin
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decodesechdrflags(Ashtype,Ashflags,aoptions);
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inherited create(Aname,Aalign,aoptions);
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secshidx:=0;
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shstridx:=0;
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shtype:=AshType;
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shflags:=AshFlags;
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shlink:=Ashlink;
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shinfo:=Ashinfo;
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shentsize:=Aentsize;
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relocsect:=nil;
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end;
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destructor TElf32ObjSection.destroy;
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begin
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if assigned(relocsect) then
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relocsect.free;
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inherited destroy;
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end;
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{****************************************************************************
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TElf32ObjData
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****************************************************************************}
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constructor TElf32ObjData.create(const n:string);
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begin
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inherited create(n);
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CObjSection:=TElf32ObjSection;
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{ reset }
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Syms:=TDynamicArray.Create(symbolresize);
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{ default sections }
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symtabsect:=TElf32ObjSection.create_ext('.symtab',2,0,0,0,4,16);
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strtabsect:=TElf32ObjSection.create_ext('.strtab',3,0,0,0,1,0);
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shstrtabsect:=TElf32ObjSection.create_ext('.shstrtab',3,0,0,0,1,0);
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{ insert the empty and filename as first in strtab }
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strtabsect.writestr(#0);
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strtabsect.writestr(SplitFileName(current_module.mainsource^)+#0);
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{ we need at least the following sections }
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createsection(sec_code,'');
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createsection(sec_data,'');
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createsection(sec_bss,'');
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if tf_section_threadvars in target_info.flags then
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createsection(sec_threadvar,'');
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end;
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destructor TElf32ObjData.destroy;
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begin
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Syms.Free;
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symtabsect.free;
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strtabsect.free;
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shstrtabsect.free;
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inherited destroy;
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end;
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function TElf32ObjData.sectionname(atype:TAsmSectiontype;const aname:string):string;
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const
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secnames : array[TAsmSectiontype] of string[13] = ('',
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{$ifdef userodata}
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'.text','.data','.rodata','.bss','.threadvar',
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{$else userodata}
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'.text','.data','.data','.bss','.threadvar',
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{$endif userodata}
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'.text', { darwin stubs }
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'.stab','.stabstr',
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'.idata$2','.idata$4','.idata$5','.idata$6','.idata$7','.edata',
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'.eh_frame',
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'.debug_frame','.debug_info','.debug_line','.debug_abbrev',
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'fpc',
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''
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);
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begin
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if (use_smartlink_section and
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(aname<>'')) or (atype=sec_fpc) then
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result:=secnames[atype]+'.'+aname
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else
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result:=secnames[atype];
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end;
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function TElf32ObjData.sectiontype2align(atype:TAsmSectiontype):shortint;
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begin
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if atype=sec_stabstr then
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result:=1
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else
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result:=sizeof(aint);
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end;
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procedure TElf32ObjData.CreateDebugSections;
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begin
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stabssec:=createsection(sec_stab,'');
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stabstrsec:=createsection(sec_stabstr,'');
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end;
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procedure TElf32ObjData.writereloc(data,len:aint;p:TObjSymbol;relative:TObjRelocationType);
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var
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symaddr : longint;
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begin
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if CurrObjSec=nil then
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internalerror(200403292);
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{$ifdef userodata}
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if CurrObjSec.sectype in [sec_rodata,sec_bss,sec_threadvar] then
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internalerror(200408252);
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{$endif userodata}
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if assigned(p) then
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begin
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{ real address of the symbol }
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symaddr:=p.address;
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{ Local ObjSymbols can be resolved already or need a section reloc }
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if (p.bind=AB_LOCAL) then
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begin
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{ For a relative relocation in the same section the
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value can be calculated }
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if (p.objsection=CurrObjSec) and
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(relative=RELOC_RELATIVE) then
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inc(data,symaddr-len-CurrObjSec.Size)
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else
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begin
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CurrObjSec.addsectionreloc(CurrObjSec.Size,p.objsection,relative);
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inc(data,symaddr);
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end;
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end
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else
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begin
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CurrObjSec.addsymreloc(CurrObjSec.Size,p,relative);
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if relative=RELOC_RELATIVE then
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dec(data,len);
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end;
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end;
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CurrObjSec.write(data,len);
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end;
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procedure TElf32ObjData.writestab(offset:aint;ps:TObjSymbol;nidx,nother:byte;ndesc:word;p:pchar);
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var
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stab : TObjStabEntry;
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begin
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if not assigned(StabsSec) then
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internalerror(200602271);
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fillchar(stab,sizeof(TObjStabEntry),0);
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if assigned(p) and (p[0]<>#0) then
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begin
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stab.strpos:=stabstrsec.Size;
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stabstrsec.write(p^,strlen(p)+1);
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end;
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stab.ntype:=nidx;
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stab.ndesc:=ndesc;
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stab.nother:=nother;
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stab.nvalue:=offset;
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stabssec.write(stab,sizeof(stab));
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if assigned(ps) then
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stabssec.addsymreloc(stabssec.Size-4,ps,RELOC_ABSOLUTE);
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end;
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|
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{****************************************************************************
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TElf32ObjectOutput
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****************************************************************************}
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constructor TElf32ObjectOutput.create(smart:boolean);
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begin
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inherited Create(smart);
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CObjData:=TElf32ObjData;
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end;
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procedure TElf32ObjectOutput.createrelocsection(s:TElf32ObjSection);
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var
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rel : TElf32reloc;
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r : TObjRelocation;
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relsym,reltyp : longint;
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begin
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with elf32data do
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begin
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{$ifdef userodata}
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{ rodata can't have relocations }
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if s.sectype=sec_rodata then
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begin
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if assigned(s.relocations.first) then
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internalerror(200408251);
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exit;
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end;
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{$endif userodata}
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{ create the reloc section }
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s.relocsect:=TElf32ObjSection.create_ext('.rel'+s.name,9,0,symtabsect.secshidx,s.secshidx,4,8);
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{ add the relocations }
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r:=TObjRelocation(s.relocations.first);
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while assigned(r) do
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begin
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rel.address:=r.dataoffset;
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if assigned(r.symbol) then
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begin
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if (r.symbol.bind=AB_LOCAL) then
|
|
relsym:=r.symbol.objsection.secsymidx
|
|
else
|
|
begin
|
|
if r.symbol.symidx=-1 then
|
|
internalerror(200603012);
|
|
relsym:=r.symbol.symidx;
|
|
end;
|
|
end
|
|
else
|
|
if r.objsection<>nil then
|
|
relsym:=r.objsection.secsymidx
|
|
else
|
|
relsym:=SHN_UNDEF;
|
|
case r.typ of
|
|
RELOC_RELATIVE :
|
|
reltyp:=R_386_PC32;
|
|
RELOC_ABSOLUTE :
|
|
reltyp:=R_386_32;
|
|
end;
|
|
rel.info:=(relsym shl 8) or reltyp;
|
|
{ write reloc }
|
|
s.relocsect.write(rel,sizeof(rel));
|
|
r:=TObjRelocation(r.next);
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure TElf32ObjectOutput.section_write_symbol(p,arg:pointer);
|
|
var
|
|
elfsym : TElf32symbol;
|
|
begin
|
|
fillchar(elfsym,sizeof(elfsym),0);
|
|
elfsym.st_name:=TElf32ObjSection(p).shstridx;
|
|
elfsym.st_info:=STT_SECTION;
|
|
elfsym.st_shndx:=TElf32ObjSection(p).secshidx;
|
|
TObjSection(p).secsymidx:=symidx;
|
|
inc(symidx);
|
|
inc(localsyms);
|
|
elf32data.symtabsect.write(elfsym,sizeof(elfsym));
|
|
end;
|
|
|
|
|
|
procedure TElf32ObjectOutput.createsymtab;
|
|
var
|
|
elfsym : TElf32symbol;
|
|
i : longint;
|
|
objsym : TObjSymbol;
|
|
begin
|
|
with elf32data do
|
|
begin
|
|
symidx:=0;
|
|
localsyms:=0;
|
|
{ empty entry }
|
|
fillchar(elfsym,sizeof(elfsym),0);
|
|
symtabsect.write(elfsym,sizeof(elfsym));
|
|
inc(symidx);
|
|
inc(localsyms);
|
|
{ filename entry }
|
|
elfsym.st_name:=1;
|
|
elfsym.st_info:=STT_FILE;
|
|
elfsym.st_shndx:=SHN_ABS;
|
|
symtabsect.write(elfsym,sizeof(elfsym));
|
|
inc(symidx);
|
|
inc(localsyms);
|
|
{ section }
|
|
ObjSectionList.foreach(@section_write_symbol,nil);
|
|
{ ObjSymbols }
|
|
for i:=0 to ObjSymbolList.Count-1 do
|
|
begin
|
|
objsym:=TObjSymbol(ObjSymbolList[i]);
|
|
if objsym.bind<>AB_LOCAL then
|
|
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_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:=TElf32ObjSection(objsym.objsection).secshidx
|
|
else
|
|
elfsym.st_shndx:=SHN_UNDEF;
|
|
end;
|
|
objsym.symidx:=symidx;
|
|
inc(symidx);
|
|
symtabsect.write(elfsym,sizeof(elfsym));
|
|
end;
|
|
end;
|
|
{ update the .symtab section header }
|
|
symtabsect.shlink:=strtabsect.secshidx;
|
|
symtabsect.shinfo:=localsyms;
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure TElf32ObjectOutput.section_write_sh_string(p,arg:pointer);
|
|
begin
|
|
TElf32ObjSection(p).shstridx:=elf32data.shstrtabsect.writestr(TObjSection(p).name+#0);
|
|
if assigned(TElf32ObjSection(p).relocsect) then
|
|
TElf32ObjSection(p).relocsect.shstridx:=elf32data.shstrtabsect.writestr(TElf32ObjSection(p).relocsect.name+#0);
|
|
end;
|
|
|
|
|
|
procedure TElf32ObjectOutput.createshstrtab;
|
|
begin
|
|
with elf32data do
|
|
begin
|
|
with shstrtabsect do
|
|
begin
|
|
writestr(#0);
|
|
symtabsect.shstridx:=writestr('.symtab'#0);
|
|
strtabsect.shstridx:=writestr('.strtab'#0);
|
|
shstrtabsect.shstridx:=writestr('.shstrtab'#0);
|
|
ObjSectionList.foreach(@section_write_sh_string,nil);
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure TElf32ObjectOutput.writesectionheader(s:TElf32ObjSection);
|
|
var
|
|
sechdr : TElf32sechdr;
|
|
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(sechdr,sizeof(sechdr));
|
|
end;
|
|
|
|
|
|
|
|
procedure TElf32ObjectOutput.writesectiondata(s:TElf32ObjSection);
|
|
begin
|
|
FWriter.writezeros(s.dataalignbytes);
|
|
FWriter.writearray(s.data);
|
|
end;
|
|
|
|
|
|
procedure TElf32ObjectOutput.section_count_sections(p,arg:pointer);
|
|
begin
|
|
TElf32ObjSection(p).secshidx:=pword(arg)^;
|
|
inc(pword(arg)^);
|
|
if TElf32ObjSection(p).relocations.count>0 then
|
|
inc(pword(arg)^);
|
|
end;
|
|
|
|
|
|
procedure TElf32ObjectOutput.section_create_relocsec(p,arg:pointer);
|
|
begin
|
|
if (TElf32ObjSection(p).relocations.count>0) then
|
|
createrelocsection(TElf32ObjSection(p));
|
|
end;
|
|
|
|
|
|
procedure TElf32ObjectOutput.section_set_datapos(p,arg:pointer);
|
|
begin
|
|
TObjSection(p).setdatapos(paint(arg)^);
|
|
end;
|
|
|
|
|
|
procedure TElf32ObjectOutput.section_relocsec_set_datapos(p,arg:pointer);
|
|
begin
|
|
if assigned(TElf32ObjSection(p).relocsect) then
|
|
TElf32ObjSection(p).relocsect.setdatapos(paint(arg)^);
|
|
end;
|
|
|
|
|
|
procedure TElf32ObjectOutput.section_write_data(p,arg:pointer);
|
|
begin
|
|
if (oso_data in TObjSection(p).secoptions) then
|
|
begin
|
|
if TObjSection(p).data=nil then
|
|
internalerror(200403073);
|
|
writesectiondata(TElf32ObjSection(p));
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure TElf32ObjectOutput.section_write_sechdr(p,arg:pointer);
|
|
begin
|
|
writesectionheader(TElf32ObjSection(p));
|
|
if assigned(TElf32ObjSection(p).relocsect) then
|
|
writesectionheader(TElf32ObjSection(p).relocsect);
|
|
end;
|
|
|
|
|
|
procedure TElf32ObjectOutput.section_write_relocsec(p,arg:pointer);
|
|
begin
|
|
if assigned(TElf32ObjSection(p).relocsect) then
|
|
writesectiondata(TElf32ObjSection(p).relocsect);
|
|
end;
|
|
|
|
|
|
|
|
function TElf32ObjectOutput.writedata(data:TObjData):boolean;
|
|
var
|
|
header : TElf32header;
|
|
shoffset,
|
|
datapos : aint;
|
|
nsections : word;
|
|
begin
|
|
result:=false;
|
|
elf32data:=TElf32ObjData(data);
|
|
with elf32data do
|
|
begin
|
|
{ calc amount of sections we have }
|
|
nsections:=1;
|
|
{ also create the index in the section header table }
|
|
ObjSectionList.foreach(@section_count_sections,@nsections);
|
|
{ add default sections }
|
|
shstrtabsect.secshidx:=nsections;
|
|
inc(nsections);
|
|
symtabsect.secshidx:=nsections;
|
|
inc(nsections);
|
|
strtabsect.secshidx:=nsections;
|
|
inc(nsections);
|
|
{ create .symtab and .strtab }
|
|
createsymtab;
|
|
{ Create the relocation sections }
|
|
ObjSectionList.foreach(@section_create_relocsec,nil);
|
|
{ create .shstrtab }
|
|
createshstrtab;
|
|
|
|
{ Calculate the filepositions }
|
|
datapos:=$40; { elfheader + alignment }
|
|
{ sections first }
|
|
ObjSectionList.foreach(@section_set_datapos,@datapos);
|
|
{ shstrtab }
|
|
shstrtabsect.setdatapos(datapos);
|
|
{ section headers }
|
|
shoffset:=datapos;
|
|
inc(datapos,nsections*sizeof(TElf32sechdr));
|
|
{ symtab }
|
|
symtabsect.setdatapos(datapos);
|
|
{ strtab }
|
|
strtabsect.setdatapos(datapos);
|
|
{ .rel sections }
|
|
ObjSectionList.foreach(@section_relocsec_set_datapos,@datapos);
|
|
|
|
{ Write ELF Header }
|
|
fillchar(header,sizeof(header),0);
|
|
header.magic0123:=$464c457f; { = #127'ELF' }
|
|
header.file_class:=1;
|
|
header.data_encoding:=1;
|
|
header.file_version:=1;
|
|
header.e_type:=1;
|
|
header.e_machine:=3;
|
|
header.e_version:=1;
|
|
header.e_shoff:=shoffset;
|
|
header.e_shstrndx:=shstrtabsect.secshidx;
|
|
header.e_shnum:=nsections;
|
|
header.e_ehsize:=sizeof(TElf32header);
|
|
header.e_shentsize:=sizeof(TElf32sechdr);
|
|
writer.write(header,sizeof(header));
|
|
writer.writezeros($40-sizeof(header)); { align }
|
|
{ Sections }
|
|
ObjSectionList.foreach(@section_write_data,nil);
|
|
{ .shstrtab }
|
|
writesectiondata(shstrtabsect);
|
|
{ section headers, start with an empty header for sh_undef }
|
|
writer.writezeros(sizeof(TElf32sechdr));
|
|
ObjSectionList.foreach(@section_write_sechdr,nil);
|
|
writesectionheader(shstrtabsect);
|
|
writesectionheader(symtabsect);
|
|
writesectionheader(strtabsect);
|
|
{ .symtab }
|
|
writesectiondata(symtabsect);
|
|
{ .strtab }
|
|
writesectiondata(strtabsect);
|
|
{ .rel sections }
|
|
ObjSectionList.foreach(@section_write_relocsec,nil);
|
|
end;
|
|
result:=true;
|
|
end;
|
|
|
|
|
|
{****************************************************************************
|
|
TELFAssembler
|
|
****************************************************************************}
|
|
|
|
constructor TElf32Assembler.Create(smart:boolean);
|
|
begin
|
|
inherited Create(smart);
|
|
CObjOutput:=TElf32ObjectOutput;
|
|
end;
|
|
|
|
|
|
{*****************************************************************************
|
|
Initialize
|
|
*****************************************************************************}
|
|
|
|
const
|
|
as_i386_elf32_info : tasminfo =
|
|
(
|
|
id : as_i386_elf32;
|
|
idtxt : 'ELF';
|
|
asmbin : '';
|
|
asmcmd : '';
|
|
supported_target : system_any; //target_i386_linux;
|
|
flags : [af_outputbinary,af_smartlink_sections];
|
|
labelprefix : '.L';
|
|
comment : '';
|
|
);
|
|
|
|
|
|
initialization
|
|
RegisterAssembler(as_i386_elf32_info,TElf32Assembler);
|
|
end.
|