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https://gitlab.com/freepascal.org/fpc/source.git
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887 lines
29 KiB
ObjectPascal
887 lines
29 KiB
ObjectPascal
{
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Copyright (c) 1998-2002 by Peter Vreman
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Contains the binary elf writer
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* This code was inspired by the NASM sources
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The Netwide Assembler is Copyright (c) 1996 Simon Tatham and
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Julian Hall. All rights reserved.
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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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telf32section = class(TAsmSection)
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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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entsize : longint;
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{ relocation }
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relocsect : telf32Section;
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constructor create(const Aname:string;Atype:TAsmSectionType;Aalign:longint;Aoptions:TAsmSectionOptions);override;
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constructor create_ext(const Aname:string;Atype:TAsmSectionType;Ashtype,Ashflags,Ashlink,Ashinfo,Aalign,Aentsize:longint);
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destructor destroy;override;
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end;
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telf32objectdata = class(TAsmObjectData)
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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 : telf32Section;
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syms : Tdynamicarray;
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constructor create(const n:string);
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destructor destroy;override;
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function sectionname(atype:tasmsectiontype;const aname:string):string;override;
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procedure writereloc(data,len:aint;p:tasmsymbol;relative:TAsmRelocationType);override;
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procedure writesymbol(p:tasmsymbol);override;
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procedure writestab(offset:aint;ps:tasmsymbol;nidx,nother,line:longint;p:pchar);override;
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procedure beforealloc;override;
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procedure beforewrite;override;
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end;
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telf32objectoutput = class(tobjectoutput)
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private
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elf32data : telf32objectdata;
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initsym : longint;
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procedure createrelocsection(s:telf32section);
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procedure createshstrtab;
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procedure createsymtab;
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procedure writesectionheader(s:telf32section);
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procedure writesectiondata(s:telf32section);
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procedure section_write_symbol(p:tnamedindexitem;arg:pointer);
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procedure section_write_sh_string(p:tnamedindexitem;arg:pointer);
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procedure section_number_symbol(p:tnamedindexitem;arg:pointer);
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procedure section_count_sects(p:tnamedindexitem;arg:pointer);
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procedure section_create_relocsec(p:tnamedindexitem;arg:pointer);
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procedure section_set_datapos(p:tnamedindexitem;arg:pointer);
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procedure section_relocsec_set_datapos(p:tnamedindexitem;arg:pointer);
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procedure section_write_data(p:tnamedindexitem;arg:pointer);
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procedure section_write_sechdr(p:tnamedindexitem;arg:pointer);
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procedure section_write_relocsec(p:tnamedindexitem;arg:pointer);
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protected
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function writedata(data:TAsmObjectData):boolean;override;
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public
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function newobjectdata(const n:string):TAsmObjectData;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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telf32stab=packed record
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strpos : longint;
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ntype : byte;
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nother : byte;
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ndesc : word;
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nvalue : longint;
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end;
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{****************************************************************************
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TSection
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****************************************************************************}
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constructor telf32section.create(const Aname:string;Atype:TAsmSectionType;Aalign:longint;Aoptions:TAsmSectionOptions);
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var
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Ashflags,Ashtype,Aentsize : longint;
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begin
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Ashflags:=0;
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Ashtype:=0;
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Aentsize:=0;
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case Atype of
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sec_code :
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begin
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Ashflags:=SHF_ALLOC or SHF_EXECINSTR;
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AshType:=SHT_PROGBITS;
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AAlign:=max(sizeof(aint),AAlign);
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end;
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sec_data :
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begin
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Ashflags:=SHF_ALLOC or SHF_WRITE;
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AshType:=SHT_PROGBITS;
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AAlign:=max(sizeof(aint),AAlign);
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end;
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sec_rodata :
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begin
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{$warning TODO Remove rodata hack}
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Ashflags:=SHF_ALLOC or SHF_WRITE;
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AshType:=SHT_PROGBITS;
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AAlign:=max(sizeof(aint),AAlign);
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end;
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sec_bss,sec_threadvar :
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begin
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Ashflags:=SHF_ALLOC or SHF_WRITE;
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AshType:=SHT_NOBITS;
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AAlign:=max(sizeof(aint),AAlign);
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end;
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sec_stab :
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begin
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AshType:=SHT_PROGBITS;
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AAlign:=max(sizeof(aint),AAlign);
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Aentsize:=sizeof(telf32stab);
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end;
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sec_stabstr :
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begin
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AshType:=SHT_STRTAB;
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AAlign:=1;
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end;
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sec_fpc :
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begin
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AshFlags:=SHF_ALLOC;
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AshType:=SHT_PROGBITS ;
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AAlign:=4;// max(sizeof(aint),AAlign);
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end;
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else
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internalerror(200509122);
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end;
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create_ext(Aname,Atype,Ashtype,Ashflags,0,0,Aalign,Aentsize);
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end;
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constructor telf32section.create_ext(const Aname:string;Atype:TAsmSectionType;Ashtype,Ashflags,Ashlink,Ashinfo,Aalign,Aentsize:longint);
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var
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aoptions : TAsmSectionOptions;
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begin
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aoptions:=[];
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if (AshType=SHT_NOBITS) then
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include(aoptions,aso_alloconly);
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inherited create(Aname,Atype,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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entsize:=Aentsize;
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relocsect:=nil;
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end;
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destructor telf32section.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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telf32objectdata
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****************************************************************************}
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constructor telf32objectdata.create(const n:string);
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begin
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inherited create(n);
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CAsmSection:=TElf32Section;
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{ reset }
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Syms:=TDynamicArray.Create(symbolresize);
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{ default sections }
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symtabsect:=telf32section.create_ext('.symtab',sec_custom,2,0,0,0,4,16);
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strtabsect:=telf32section.create_ext('.strtab',sec_custom,3,0,0,0,1,0);
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shstrtabsect:=telf32section.create_ext('.shstrtab',sec_custom,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,'',0,[]);
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createsection(sec_data,'',0,[]);
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createsection(sec_bss,'',0,[]);
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{$ifdef segment_threadvars}
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createsection(sec_threadvar,'',0,[]);
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{$endif}
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{ create stabs sections if debugging }
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if (cs_debuginfo in aktmoduleswitches) then
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begin
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stabssec:=createsection(sec_stab,'',0,[]);
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stabstrsec:=createsection(sec_stabstr,'',0,[]);
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end;
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end;
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destructor telf32objectdata.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 telf32objectdata.sectionname(atype:tasmsectiontype;const aname:string):string;
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const
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secnames : array[tasmsectiontype] of string[12] = ('',
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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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'common',
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'.note',
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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',
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'fpc'
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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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procedure telf32objectdata.writesymbol(p:tasmsymbol);
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begin
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if currsec=nil then
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internalerror(200403291);
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{ already written ? }
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if p.indexnr<>-1 then
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exit;
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{ calculate symbol index }
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if (p.currbind<>AB_LOCAL) then
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begin
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{ insert the symbol in the local index, the indexarray
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will take care of the numbering }
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symbols.insert(p);
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end
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else
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p.indexnr:=-2; { local }
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end;
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procedure telf32objectdata.writereloc(data,len:aint;p:tasmsymbol;relative:TAsmRelocationType);
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var
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symaddr : longint;
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begin
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if currsec=nil then
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internalerror(200403292);
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{$ifdef userodata}
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if currsec.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 symbols can be resolved already or need a section reloc }
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if (p.currbind=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.section=currsec) and
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(relative=RELOC_RELATIVE) then
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inc(data,symaddr-len-currsec.datasize)
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else
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begin
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currsec.addsectionreloc(currsec.datasize,p.section,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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writesymbol(p);
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currsec.addsymreloc(currsec.datasize,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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currsec.write(data,len);
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end;
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procedure telf32objectdata.writestab(offset:aint;ps:tasmsymbol;nidx,nother,line:longint;p:pchar);
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var
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stab : telf32stab;
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begin
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fillchar(stab,sizeof(telf32stab),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.datasize;
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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:=line;
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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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begin
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writesymbol(ps);
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stabssec.addsymreloc(stabssec.datasize-4,ps,RELOC_ABSOLUTE);
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end;
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end;
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procedure telf32objectdata.beforealloc;
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begin
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{ create stabs sections if debugging }
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if (cs_debuginfo in aktmoduleswitches) then
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begin
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StabsSec.Alloc(sizeof(telf32stab));
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StabStrSec.Alloc(length(SplitFileName(current_module.mainsource^))+2);
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end;
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end;
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procedure telf32objectdata.beforewrite;
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var
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s : string;
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begin
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{ create stabs sections if debugging }
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if (cs_debuginfo in aktmoduleswitches) then
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begin
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writestab(0,nil,0,0,0,nil);
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{ write zero pchar and name together (PM) }
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s:=#0+SplitFileName(current_module.mainsource^)+#0;
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stabstrsec.write(s[1],length(s));
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end;
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end;
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{****************************************************************************
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telf32objectoutput
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****************************************************************************}
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function telf32objectoutput.newobjectdata(const n:string):TAsmObjectData;
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begin
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result:=telf32objectdata.create(n);
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end;
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procedure telf32objectoutput.createrelocsection(s:telf32section);
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var
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rel : telf32reloc;
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r : tasmrelocation;
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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:=telf32section.create_ext('.rel'+s.name,sec_custom,9,0,symtabsect.secshidx,s.secshidx,4,8);
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{ add the relocations }
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r:=TasmRelocation(s.relocations.first);
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while assigned(r) do
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begin
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rel.address:=r.address;
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if assigned(r.symbol) then
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begin
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if (r.symbol.currbind=AB_LOCAL) then
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relsym:=r.symbol.section.secsymidx
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else
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begin
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if r.symbol.indexnr=-1 then
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internalerror(4321);
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{ indexnr starts with 1, ELF starts with 0 }
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relsym:=r.symbol.indexnr+initsym-1;
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end;
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end
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else
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if r.section<>nil then
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relsym:=r.section.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:=TAsmRelocation(r.next);
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure telf32objectoutput.section_write_symbol(p:tnamedindexitem;arg:pointer);
|
|
var
|
|
elfsym : telf32symbol;
|
|
begin
|
|
fillchar(elfsym,sizeof(elfsym),0);
|
|
elfsym.st_name:=telf32section(p).shstridx;
|
|
elfsym.st_info:=STT_SECTION;
|
|
elfsym.st_shndx:=telf32section(p).secshidx;
|
|
elf32data.symtabsect.write(elfsym,sizeof(elfsym));
|
|
{ increase locals count }
|
|
inc(plongint(arg)^);
|
|
end;
|
|
|
|
|
|
procedure telf32objectoutput.createsymtab;
|
|
var
|
|
elfsym : telf32symbol;
|
|
locals : longint;
|
|
sym : tasmsymbol;
|
|
begin
|
|
with elf32data do
|
|
begin
|
|
locals:=2;
|
|
{ empty entry }
|
|
fillchar(elfsym,sizeof(elfsym),0);
|
|
symtabsect.write(elfsym,sizeof(elfsym));
|
|
{ filename entry }
|
|
elfsym.st_name:=1;
|
|
elfsym.st_info:=STT_FILE;
|
|
elfsym.st_shndx:=SHN_ABS;
|
|
symtabsect.write(elfsym,sizeof(elfsym));
|
|
{ section }
|
|
sects.foreach(@section_write_symbol,@locals);
|
|
{ symbols }
|
|
sym:=Tasmsymbol(symbols.First);
|
|
while assigned(sym) do
|
|
begin
|
|
fillchar(elfsym,sizeof(elfsym),0);
|
|
{ symbolname, write the #0 separate to overcome 255+1 char not possible }
|
|
elfsym.st_name:=strtabsect.datasize;
|
|
strtabsect.writestr(sym.name);
|
|
strtabsect.writestr(#0);
|
|
case sym.currbind of
|
|
AB_LOCAL,
|
|
AB_GLOBAL :
|
|
elfsym.st_value:=sym.address;
|
|
AB_COMMON :
|
|
elfsym.st_value:=$10;
|
|
end;
|
|
elfsym.st_size:=sym.size;
|
|
case sym.currbind of
|
|
AB_LOCAL :
|
|
begin
|
|
elfsym.st_info:=STB_LOCAL shl 4;
|
|
inc(locals);
|
|
end;
|
|
AB_COMMON,
|
|
AB_EXTERNAL,
|
|
AB_GLOBAL :
|
|
elfsym.st_info:=STB_GLOBAL shl 4;
|
|
end;
|
|
if (sym.currbind<>AB_EXTERNAL) and
|
|
not(assigned(sym.section) and
|
|
(sym.section.sectype=sec_bss)) then
|
|
begin
|
|
case sym.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 sym.currbind=AB_COMMON then
|
|
elfsym.st_shndx:=SHN_COMMON
|
|
else
|
|
if assigned(sym.section) then
|
|
elfsym.st_shndx:=telf32section(sym.section).secshidx
|
|
else
|
|
elfsym.st_shndx:=SHN_UNDEF;
|
|
symtabsect.write(elfsym,sizeof(elfsym));
|
|
sym:=tasmsymbol(sym.indexnext);
|
|
end;
|
|
{ update the .symtab section header }
|
|
symtabsect.shlink:=strtabsect.secshidx;
|
|
symtabsect.shinfo:=locals;
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure telf32objectoutput.section_write_sh_string(p:tnamedindexitem;arg:pointer);
|
|
begin
|
|
telf32section(p).shstridx:=elf32data.shstrtabsect.writestr(tasmsection(p).name+#0);
|
|
if assigned(telf32section(p).relocsect) then
|
|
telf32section(p).relocsect.shstridx:=elf32data.shstrtabsect.writestr(telf32section(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);
|
|
sects.foreach(@section_write_sh_string,nil);
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure telf32objectoutput.writesectionheader(s:telf32section);
|
|
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.datasize;
|
|
sechdr.sh_link:=s.shlink;
|
|
sechdr.sh_info:=s.shinfo;
|
|
sechdr.sh_addralign:=s.addralign;
|
|
sechdr.sh_entsize:=s.entsize;
|
|
writer.write(sechdr,sizeof(sechdr));
|
|
end;
|
|
|
|
|
|
|
|
procedure telf32objectoutput.writesectiondata(s:telf32section);
|
|
var
|
|
hp : pdynamicblock;
|
|
begin
|
|
FWriter.writezeros(s.dataalignbytes);
|
|
s.alignsection;
|
|
hp:=s.data.firstblock;
|
|
while assigned(hp) do
|
|
begin
|
|
FWriter.write(hp^.data,hp^.used);
|
|
hp:=hp^.next;
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure telf32objectoutput.section_number_symbol(p:tnamedindexitem;arg:pointer);
|
|
begin
|
|
tasmsection(p).secsymidx:=plongint(arg)^;
|
|
inc(plongint(arg)^);
|
|
end;
|
|
|
|
|
|
procedure telf32objectoutput.section_count_sects(p:tnamedindexitem;arg:pointer);
|
|
begin
|
|
telf32section(p).secshidx:=plongint(arg)^;
|
|
inc(plongint(arg)^);
|
|
if telf32section(p).relocations.count>0 then
|
|
inc(plongint(arg)^);
|
|
end;
|
|
|
|
|
|
procedure telf32objectoutput.section_create_relocsec(p:tnamedindexitem;arg:pointer);
|
|
begin
|
|
if (telf32section(p).relocations.count>0) then
|
|
createrelocsection(telf32section(p));
|
|
end;
|
|
|
|
|
|
procedure telf32objectoutput.section_set_datapos(p:tnamedindexitem;arg:pointer);
|
|
begin
|
|
if (aso_alloconly in tasmsection(p).secoptions) then
|
|
tasmsection(p).datapos:=paint(arg)^
|
|
else
|
|
tasmsection(p).setdatapos(paint(arg)^);
|
|
end;
|
|
|
|
|
|
procedure telf32objectoutput.section_relocsec_set_datapos(p:tnamedindexitem;arg:pointer);
|
|
begin
|
|
if assigned(telf32section(p).relocsect) then
|
|
telf32section(p).relocsect.setdatapos(paint(arg)^);
|
|
end;
|
|
|
|
|
|
procedure telf32objectoutput.section_write_data(p:tnamedindexitem;arg:pointer);
|
|
begin
|
|
if (aso_alloconly in tasmsection(p).secoptions) then
|
|
exit;
|
|
if tasmsection(p).data=nil then
|
|
internalerror(200403073);
|
|
writesectiondata(telf32section(p));
|
|
end;
|
|
|
|
|
|
procedure telf32objectoutput.section_write_sechdr(p:tnamedindexitem;arg:pointer);
|
|
begin
|
|
writesectionheader(telf32section(p));
|
|
if assigned(telf32section(p).relocsect) then
|
|
writesectionheader(telf32section(p).relocsect);
|
|
end;
|
|
|
|
|
|
procedure telf32objectoutput.section_write_relocsec(p:tnamedindexitem;arg:pointer);
|
|
begin
|
|
if assigned(telf32section(p).relocsect) then
|
|
writesectiondata(telf32section(p).relocsect);
|
|
end;
|
|
|
|
|
|
|
|
function telf32objectoutput.writedata(data:TAsmObjectData):boolean;
|
|
var
|
|
header : telf32header;
|
|
datapos : aint;
|
|
shoffset,
|
|
nsects : longint;
|
|
hstab : telf32stab;
|
|
empty : array[0..63] of byte;
|
|
begin
|
|
result:=false;
|
|
elf32data:=telf32objectdata(data);
|
|
with elf32data do
|
|
begin
|
|
{ calc amount of sections we have }
|
|
initsym:=2;
|
|
nsects:=1;
|
|
fillchar(empty,sizeof(empty),0);
|
|
{ each section requires a symbol for relocation }
|
|
sects.foreach(@section_number_symbol,@initsym);
|
|
{ also create the index in the section header table }
|
|
sects.foreach(@section_count_sects,@nsects);
|
|
{ add default sections follows }
|
|
shstrtabsect.secshidx:=nsects;
|
|
inc(nsects);
|
|
symtabsect.secshidx:=nsects;
|
|
inc(nsects);
|
|
strtabsect.secshidx:=nsects;
|
|
inc(nsects);
|
|
{ For the stab section we need an HdrSym which can now be
|
|
calculated more easily }
|
|
if assigned(stabssec) then
|
|
begin
|
|
hstab.strpos:=1;
|
|
hstab.ntype:=0;
|
|
hstab.nother:=0;
|
|
hstab.ndesc:=(stabssec.datasize div sizeof(telf32stab))-1{+1 according to gas output PM};
|
|
hstab.nvalue:=stabstrsec.datasize;
|
|
stabssec.Data.seek(0);
|
|
stabssec.Data.write(hstab,sizeof(hstab));
|
|
end;
|
|
{ Create the relocation sections }
|
|
sects.foreach(@section_create_relocsec,nil);
|
|
{ create .symtab and .strtab }
|
|
createsymtab;
|
|
{ create .shstrtab }
|
|
createshstrtab;
|
|
{ Calculate the filepositions }
|
|
datapos:=$40; { elfheader + alignment }
|
|
{ sections first }
|
|
sects.foreach(@section_set_datapos,@datapos);
|
|
{ shstrtab }
|
|
shstrtabsect.setdatapos(datapos);
|
|
{ section headers }
|
|
shoffset:=datapos;
|
|
inc(datapos,nsects*sizeof(telf32sechdr));
|
|
{ symtab }
|
|
symtabsect.setdatapos(datapos);
|
|
{ strtab }
|
|
strtabsect.setdatapos(datapos);
|
|
{ .rel sections }
|
|
sects.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:=nsects;
|
|
header.e_ehsize:=sizeof(telf32header);
|
|
header.e_shentsize:=sizeof(telf32sechdr);
|
|
writer.write(header,sizeof(header));
|
|
writer.write(empty,$40-sizeof(header)); { align }
|
|
{ Sections }
|
|
sects.foreach(@section_write_data,nil);
|
|
{ .shstrtab }
|
|
writesectiondata(shstrtabsect);
|
|
{ section headers, start with an empty header for sh_undef }
|
|
writer.write(empty,sizeof(telf32sechdr));
|
|
sects.foreach(@section_write_sechdr,nil);
|
|
writesectionheader(shstrtabsect);
|
|
writesectionheader(symtabsect);
|
|
writesectionheader(strtabsect);
|
|
{ .symtab }
|
|
writesectiondata(symtabsect);
|
|
{ .strtab }
|
|
writesectiondata(strtabsect);
|
|
{ .rel sections }
|
|
sects.foreach(@section_write_relocsec,nil);
|
|
end;
|
|
result:=true;
|
|
end;
|
|
|
|
|
|
{****************************************************************************
|
|
TELFAssembler
|
|
****************************************************************************}
|
|
|
|
constructor TELF32Assembler.Create(smart:boolean);
|
|
begin
|
|
inherited Create(smart);
|
|
objectoutput:=telf32objectoutput.create(smart);
|
|
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.
|