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			929 lines
		
	
	
		
			30 KiB
		
	
	
	
		
			ObjectPascal
		
	
	
	
	
	
			
		
		
	
	
			929 lines
		
	
	
		
			30 KiB
		
	
	
	
		
			ObjectPascal
		
	
	
	
	
	
| {
 | |
|     $Id$
 | |
|     Copyright (c) 1998-2000 by Peter Vreman
 | |
| 
 | |
|     Contains the binary elf writer
 | |
| 
 | |
|     * This code was inspired by the NASM sources
 | |
|       The Netwide Assembler is copyright (C) 1996 Simon Tatham and
 | |
|       Julian Hall. All rights reserved.
 | |
| 
 | |
|     This program is free software; you can redistribute it and/or modify
 | |
|     it under the terms of the GNU General Public License as published by
 | |
|     the Free Software Foundation; either version 2 of the License, or
 | |
|     (at your option) any later version.
 | |
| 
 | |
|     This program is distributed in the hope that it will be useful,
 | |
|     but WITHOUT ANY WARRANTY; without even the implied warranty of
 | |
|     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 | |
|     GNU General Public License for more details.
 | |
| 
 | |
|     You should have received a copy of the GNU General Public License
 | |
|     along with this program; if not, write to the Free Software
 | |
|     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 | |
| 
 | |
|  ****************************************************************************
 | |
| }
 | |
| unit ogelf;
 | |
| 
 | |
| {$i defines.inc}
 | |
| 
 | |
| interface
 | |
| 
 | |
|     uses
 | |
|        { common }
 | |
|        cclasses,
 | |
|        { target }
 | |
|        systems,
 | |
|        { assembler }
 | |
|        cpubase,aasm,assemble,
 | |
|        { output }
 | |
|        ogbase;
 | |
| 
 | |
|     type
 | |
|        telf32section = class(tobjectsection)
 | |
|        public
 | |
|           secshidx  : longint; { index for the section in symtab }
 | |
|           shstridx,
 | |
|           shtype,
 | |
|           shflags,
 | |
|           shlink,
 | |
|           shinfo,
 | |
|           entsize   : longint;
 | |
|           { relocation }
 | |
|           relocsect : telf32Section;
 | |
|           constructor createsec(sec:TSection);
 | |
|           constructor createname(const Aname:string;Atype,Aflags,Alink,Ainfo,Aalign,Aentsize:longint);
 | |
|           destructor  destroy;override;
 | |
|        end;
 | |
| 
 | |
|        telf32data = class(tobjectdata)
 | |
|        public
 | |
|          symtabsect,
 | |
|          strtabsect,
 | |
|          shstrtabsect,
 | |
|          gotpcsect,
 | |
|          gotoffsect,
 | |
|          gotsect,
 | |
|          pltsect,
 | |
|          symsect  : telf32Section;
 | |
|          syms     : Tdynamicarray;
 | |
|          constructor create;
 | |
|          destructor  destroy;override;
 | |
|          procedure createsection(sec:tsection);override;
 | |
|          procedure setsectionsizes(var s:tsecsize);override;
 | |
|          procedure writereloc(data,len:longint;p:tasmsymbol;relative:relative_type);override;
 | |
|          procedure writesymbol(p:tasmsymbol);override;
 | |
|          procedure writestabs(section:tsection;offset:longint;p:pchar;nidx,nother,line:longint;reloc:boolean);override;
 | |
|          procedure writesymstabs(section:tsection;offset:longint;p:pchar;ps:tasmsymbol;
 | |
|                                  nidx,nother,line:longint;reloc:boolean);override;
 | |
|        end;
 | |
| 
 | |
|        telf32objectoutput = class(tobjectoutput)
 | |
|        private
 | |
|          initsym  : longint;
 | |
|          procedure createrelocsection(s:telf32section);
 | |
|          procedure createshstrtab;
 | |
|          procedure createsymtab;
 | |
|          procedure writesectionheader(s:telf32section);
 | |
|        protected
 | |
|          procedure writetodisk;override;
 | |
|        public
 | |
|          function  initwriting(const fn:string):boolean;override;
 | |
|        end;
 | |
| 
 | |
|        telf32assembler = class(tinternalassembler)
 | |
|          constructor create(smart:boolean);override;
 | |
|        end;
 | |
| 
 | |
| 
 | |
| implementation
 | |
| 
 | |
|       uses
 | |
| {$ifdef delphi}
 | |
|         sysutils,
 | |
| {$else}
 | |
|         strings,
 | |
| {$endif}
 | |
|         verbose,
 | |
|         globtype,cutils,globals,fmodule;
 | |
| 
 | |
|     const
 | |
|       symbolresize = 200*18;
 | |
|       DataResize   = 8192;
 | |
| 
 | |
|     const
 | |
|       R_386_32 = 1;                    { ordinary absolute relocation }
 | |
|       R_386_PC32 = 2;                  { PC-relative relocation }
 | |
|       R_386_GOT32 = 3;                 { an offset into GOT }
 | |
|       R_386_PLT32 = 4;                 { a PC-relative offset into PLT }
 | |
|       R_386_GOTOFF = 9;                { an offset from GOT base }
 | |
|       R_386_GOTPC = 10;                { a PC-relative offset _to_ GOT }
 | |
| 
 | |
|       SHN_UNDEF     = 0;
 | |
|       SHN_ABS       = $fff1;
 | |
|       SHN_COMMON    = $fff2;
 | |
| 
 | |
|       SHT_NULL     = 0;
 | |
|       SHT_PROGBITS = 1;
 | |
|       SHT_SYMTAB   = 2;
 | |
|       SHT_STRTAB   = 3;
 | |
|       SHT_RELA     = 4;
 | |
|       SHT_HASH     = 5;
 | |
|       SHT_DYNAMIC  = 6;
 | |
|       SHT_NOTE     = 7;
 | |
|       SHT_NOBITS   = 8;
 | |
|       SHT_REL      = 9;
 | |
|       SHT_SHLIB    = 10;
 | |
|       SHT_DYNSYM   = 11;
 | |
| 
 | |
|       SHF_WRITE     = 1;
 | |
|       SHF_ALLOC     = 2;
 | |
|       SHF_EXECINSTR = 4;
 | |
| 
 | |
|       STB_LOCAL   = 0;
 | |
|       STB_GLOBAL  = 1;
 | |
|       STB_WEAK    = 2;
 | |
| 
 | |
|       STT_NOTYPE  = 0;
 | |
|       STT_OBJECT  = 1;
 | |
|       STT_FUNC    = 2;
 | |
|       STT_SECTION = 3;
 | |
|       STT_FILE    = 4;
 | |
| 
 | |
|       type
 | |
|       { Structures which are written directly to the output file }
 | |
|         telf32header=packed record
 | |
|           magic0123         : longint;
 | |
|           file_class        : byte;
 | |
|           data_encoding     : byte;
 | |
|           file_version      : byte;
 | |
|           padding           : array[$07..$0f] of byte;
 | |
|           e_type            : word;
 | |
|           e_machine         : word;
 | |
|           e_version         : longint;
 | |
|           e_entry           : longint;          { entrypoint }
 | |
|           e_phoff           : longint;          { program header offset }
 | |
|           e_shoff           : longint;          { sections header offset }
 | |
|           e_flags           : longint;
 | |
|           e_ehsize          : word;             { elf header size in bytes }
 | |
|           e_phentsize       : word;             { size of an entry in the program header array }
 | |
|           e_phnum           : word;             { 0..e_phnum-1 of entrys }
 | |
|           e_shentsize       : word;             { size of an entry in sections header array }
 | |
|           e_shnum           : word;             { 0..e_shnum-1 of entrys }
 | |
|           e_shstrndx        : word;             { index of string section header }
 | |
|         end;
 | |
|         telf32sechdr=packed record
 | |
|           sh_name           : longint;
 | |
|           sh_type           : longint;
 | |
|           sh_flags          : longint;
 | |
|           sh_addr           : longint;
 | |
|           sh_offset         : longint;
 | |
|           sh_size           : longint;
 | |
|           sh_link           : longint;
 | |
|           sh_info           : longint;
 | |
|           sh_addralign      : longint;
 | |
|           sh_entsize        : longint;
 | |
|         end;
 | |
|         pelf32reloc=^telf32reloc;
 | |
|         telf32reloc=packed record
 | |
|           address : longint;
 | |
|           info    : longint; { bit 0-7: type, 8-31: symbol }
 | |
|         end;
 | |
|         pelf32symbol=^telf32symbol;
 | |
|         telf32symbol=packed record
 | |
|           st_name  : longint;
 | |
|           st_value : longint;
 | |
|           st_size  : longint;
 | |
|           st_info  : byte; { bit 0-3: type, 4-7: bind }
 | |
|           st_other : byte;
 | |
|           st_shndx : word;
 | |
|         end;
 | |
|         pelf32stab=^telf32stab;
 | |
|         telf32stab=packed record
 | |
|           strpos  : longint;
 | |
|           ntype   : byte;
 | |
|           nother  : byte;
 | |
|           ndesc   : word;
 | |
|           nvalue  : longint;
 | |
|         end;
 | |
| 
 | |
| 
 | |
| {****************************************************************************
 | |
|                                TSection
 | |
| ****************************************************************************}
 | |
| 
 | |
|     constructor telf32section.createsec(sec:TSection);
 | |
|       var
 | |
|         Aflags,Atype,Aalign,Aentsize : longint;
 | |
|       begin
 | |
|         Aflags:=0;
 | |
|         Atype:=0;
 | |
|         Aalign:=0;
 | |
|         Aentsize:=0;
 | |
|         case sec of
 | |
|           sec_code :
 | |
|             begin
 | |
|               Aflags:=SHF_ALLOC or SHF_EXECINSTR;
 | |
|               AType:=SHT_PROGBITS;
 | |
|               AAlign:=16;
 | |
|             end;
 | |
|           sec_data :
 | |
|             begin
 | |
|               Aflags:=SHF_ALLOC or SHF_WRITE;
 | |
|               AType:=SHT_PROGBITS;
 | |
|               AAlign:=4;
 | |
|             end;
 | |
|           sec_bss :
 | |
|             begin
 | |
|               Aflags:=SHF_ALLOC or SHF_WRITE;
 | |
|               AType:=SHT_NOBITS;
 | |
|               AAlign:=4;
 | |
|             end;
 | |
|           sec_stab :
 | |
|             begin
 | |
|               AType:=SHT_PROGBITS;
 | |
|               AAlign:=4;
 | |
|               Aentsize:=sizeof(telf32stab);
 | |
|             end;
 | |
|           sec_stabstr :
 | |
|             begin
 | |
|               AType:=SHT_STRTAB;
 | |
|               AAlign:=1;
 | |
|             end;
 | |
|         end;
 | |
|         createname(target_asm.secnames[sec],Atype,Aflags,0,0,Aalign,Aentsize);
 | |
|       end;
 | |
| 
 | |
| 
 | |
|     constructor telf32section.createname(const Aname:string;Atype,Aflags,Alink,Ainfo,Aalign,Aentsize:longint);
 | |
|       begin
 | |
|         inherited create(Aname,Aalign,(AType=SHT_NOBITS));
 | |
|         secshidx:=0;
 | |
|         shstridx:=0;
 | |
|         shtype:=AType;
 | |
|         shflags:=AFlags;
 | |
|         shlink:=Alink;
 | |
|         shinfo:=Ainfo;
 | |
|         entsize:=Aentsize;
 | |
|         relocsect:=nil;
 | |
|       end;
 | |
| 
 | |
| 
 | |
|     destructor telf32section.destroy;
 | |
|       begin
 | |
|         if assigned(relocsect) then
 | |
|           relocsect.free;
 | |
|         inherited destroy;
 | |
|       end;
 | |
| 
 | |
| 
 | |
| {****************************************************************************
 | |
|                             TElf32Data
 | |
| ****************************************************************************}
 | |
| 
 | |
|     constructor telf32data.create;
 | |
|       var
 | |
|         s : string;
 | |
|       begin
 | |
|         inherited create;
 | |
|         { reset }
 | |
|         Syms:=TDynamicArray.Create(symbolresize);
 | |
|         { default sections }
 | |
|         symtabsect:=telf32section.createname('.symtab',2,0,0,0,4,16);
 | |
|         strtabsect:=telf32section.createname('.strtab',3,0,0,0,1,0);
 | |
|         shstrtabsect:=telf32section.createname('.shstrtab',3,0,0,0,1,0);
 | |
|         { insert the empty and filename as first in strtab }
 | |
|         strtabsect.writestr(#0);
 | |
|         strtabsect.writestr(SplitFileName(current_module.mainsource^)+#0);
 | |
|         { we need at least the following sections }
 | |
|         createsection(sec_code);
 | |
|         createsection(sec_data);
 | |
|         createsection(sec_bss);
 | |
|         { create stabs sections if debugging }
 | |
|         if (cs_debuginfo in aktmoduleswitches) then
 | |
|          begin
 | |
|            createsection(sec_stab);
 | |
|            createsection(sec_stabstr);
 | |
|            writestabs(sec_none,0,nil,0,0,0,false);
 | |
|            { write zero pchar and name together (PM) }
 | |
|            s:=#0+SplitFileName(current_module.mainsource^)+#0;
 | |
|            sects[sec_stabstr].write(s[1],length(s));
 | |
|          end;
 | |
|       end;
 | |
| 
 | |
| 
 | |
|     destructor telf32data.destroy;
 | |
|       begin
 | |
|         Syms.Free;
 | |
|         symtabsect.free;
 | |
|         strtabsect.free;
 | |
|         shstrtabsect.free;
 | |
|         inherited destroy;
 | |
|       end;
 | |
| 
 | |
| 
 | |
|     procedure telf32data.createsection(sec:tsection);
 | |
|       begin
 | |
|         sects[sec]:=telf32Section.createsec(Sec);
 | |
|       end;
 | |
| 
 | |
| 
 | |
|     procedure telf32data.writesymbol(p:tasmsymbol);
 | |
|       var
 | |
|         sym : toutputsymbol;
 | |
|       begin
 | |
|         { already written ? }
 | |
|         if p.idx<>-1 then
 | |
|          exit;
 | |
|         { be sure that the section will exists }
 | |
|         if (p.section<>sec_none) and not(assigned(sects[p.section])) then
 | |
|           createsection(p.section);
 | |
|         FillChar(sym,sizeof(sym),0);
 | |
|         sym.size:=p.size;
 | |
|         sym.bind:=p.bind;
 | |
|         sym.typ:=p.typ;
 | |
|         { if local of global then set the section value to the address
 | |
|           of the symbol }
 | |
|         case sym.bind of
 | |
|           AB_LOCAL,
 | |
|           AB_GLOBAL :
 | |
|             begin
 | |
|               sym.section:=p.section;
 | |
|               sym.value:=p.address;
 | |
|             end;
 | |
|           AB_COMMON :
 | |
|             begin
 | |
|               sym.value:=$10;
 | |
|             end;
 | |
|         end;
 | |
|         { store the symbol, but not the local ones }
 | |
|         if (sym.bind<>AB_LOCAL) then
 | |
|          begin
 | |
|            { symbolname, write the #0 separate to overcome 255+1 char not possible }
 | |
|            sym.nameidx:=strtabsect.datasize;
 | |
|            strtabsect.writestr(p.name);
 | |
|            strtabsect.writestr(#0);
 | |
|            { update the asmsymbol index }
 | |
|            p.idx:=syms.size div sizeof(toutputsymbol);
 | |
|            { symbol }
 | |
|            Syms.write(sym,sizeof(toutputsymbol));
 | |
|          end
 | |
|         else
 | |
|          begin
 | |
|            p.idx:=-2; { local }
 | |
|          end;
 | |
|       end;
 | |
| 
 | |
| 
 | |
|     procedure telf32data.writereloc(data,len:longint;p:tasmsymbol;relative:relative_type);
 | |
|       var
 | |
|         symaddr : longint;
 | |
|       begin
 | |
|         if not assigned(sects[currsec]) then
 | |
|          createsection(currsec);
 | |
|         if assigned(p) then
 | |
|          begin
 | |
|            { real address of the symbol }
 | |
|            symaddr:=p.address;
 | |
|            { no symbol relocation need inside a section }
 | |
|            if p.section=currsec then
 | |
|              begin
 | |
|                case relative of
 | |
|                  relative_false :
 | |
|                    begin
 | |
|                      sects[currsec].addsectionreloc(sects[currsec].datasize,currsec,relative_false);
 | |
|                      inc(data,symaddr);
 | |
|                    end;
 | |
|                  relative_true :
 | |
|                    begin
 | |
|                      inc(data,symaddr-len-sects[currsec].datasize);
 | |
|                    end;
 | |
|                  relative_rva :
 | |
|                    internalerror(3219583);
 | |
|                end;
 | |
|              end
 | |
|            else
 | |
|              begin
 | |
|                writesymbol(p);
 | |
|                if (p.section<>sec_none) and (relative<>relative_true) then
 | |
|                 begin
 | |
|                   sects[currsec].addsectionreloc(sects[currsec].datasize,p.section,relative);
 | |
|                   inc(data,symaddr);
 | |
|                 end
 | |
|                else
 | |
|                 sects[currsec].addsymreloc(sects[currsec].datasize,p,relative);
 | |
|                if relative=relative_true then
 | |
|                 begin
 | |
|                   if p.bind=AB_EXTERNAL then
 | |
|                    dec(data,len)
 | |
|                   else
 | |
|                    dec(data,len+sects[currsec].datasize);
 | |
|                 end;
 | |
|             end;
 | |
|          end;
 | |
|         sects[currsec].write(data,len);
 | |
|       end;
 | |
| 
 | |
| 
 | |
|     procedure telf32data.writestabs(section:tsection;offset:longint;p:pchar;nidx,nother,line:longint;reloc : boolean);
 | |
|       var
 | |
|         stab : telf32stab;
 | |
|         s : tsection;
 | |
|       begin
 | |
|         s:=section;
 | |
|         if reloc then
 | |
|          begin
 | |
|            if (offset=-1) then
 | |
|             begin
 | |
|               if s=sec_none then
 | |
|                offset:=0
 | |
|               else
 | |
|                offset:=sects[s].datasize;
 | |
|             end;
 | |
|          end;
 | |
|         fillchar(stab,sizeof(telf32stab),0);
 | |
|         if assigned(p) and (p[0]<>#0) then
 | |
|          begin
 | |
|            stab.strpos:=sects[sec_stabstr].datasize;
 | |
|            sects[sec_stabstr].write(p^,strlen(p)+1);
 | |
|          end;
 | |
|         stab.ntype:=nidx;
 | |
|         stab.ndesc:=line;
 | |
|         stab.nother:=nother;
 | |
|         stab.nvalue:=offset;
 | |
|         sects[sec_stab].write(stab,sizeof(stab));
 | |
|         { when the offset is not 0 then write a relocation, take also the
 | |
|           hdrstab into account with the offset }
 | |
|         if reloc then
 | |
|          sects[sec_stab].addsectionreloc(sects[sec_stab].datasize-4,s,relative_false);
 | |
|       end;
 | |
| 
 | |
| 
 | |
|     procedure telf32data.writesymstabs(section:tsection;offset:longint;p:pchar;ps:tasmsymbol;
 | |
|                                                  nidx,nother,line:longint;reloc:boolean);
 | |
|       var
 | |
|         stab : telf32stab;
 | |
|       begin
 | |
|         if reloc then
 | |
|          begin
 | |
|            if (offset=-1) then
 | |
|             begin
 | |
|               if section=sec_none then
 | |
|                offset:=0
 | |
|               else
 | |
|                offset:=sects[section].datasize;
 | |
|             end;
 | |
|          end;
 | |
|         fillchar(stab,sizeof(telf32stab),0);
 | |
|         if assigned(p) and (p[0]<>#0) then
 | |
|          begin
 | |
|            stab.strpos:=sects[sec_stabstr].datasize;
 | |
|            sects[sec_stabstr].write(p^,strlen(p)+1);
 | |
|          end;
 | |
|         stab.ntype:=nidx;
 | |
|         stab.ndesc:=line;
 | |
|         stab.nother:=nother;
 | |
|         stab.nvalue:=offset;
 | |
|         sects[sec_stab].write(stab,sizeof(stab));
 | |
|         { when the offset is not 0 then write a relocation, take also the
 | |
|           hdrstab into account with the offset }
 | |
|         if reloc then
 | |
|          sects[sec_stab].addsymreloc(sects[sec_stab].datasize-4,ps,relative_false);
 | |
|       end;
 | |
| 
 | |
| 
 | |
|     procedure telf32data.setsectionsizes(var s:tsecsize);
 | |
|       begin
 | |
|       end;
 | |
| 
 | |
| 
 | |
| {****************************************************************************
 | |
|                             telf32objectoutput
 | |
| ****************************************************************************}
 | |
| 
 | |
|     function telf32objectoutput.initwriting(const fn:string):boolean;
 | |
|       begin
 | |
|         result:=inherited initwriting(fn);
 | |
|         if result then
 | |
|          begin
 | |
|            initsym:=0;
 | |
|            Fdata:=telf32data.create;
 | |
|          end;
 | |
|       end;
 | |
| 
 | |
| 
 | |
|     procedure telf32objectoutput.createrelocsection(s:telf32section);
 | |
|       var
 | |
|         rel  : telf32reloc;
 | |
|         hr,r : poutputreloc;
 | |
|         relsym,reltyp : longint;
 | |
|       begin
 | |
|         with telf32data(data) do
 | |
|          begin
 | |
|            { create the reloc section }
 | |
|            s.relocsect:=telf32section.createname('.rel'+s.name,9,0,symtabsect.secshidx,s.secshidx,4,8);
 | |
|            { add the relocations }
 | |
|            r:=s.relochead;
 | |
|            while assigned(r) do
 | |
|             begin
 | |
|               rel.address:=r^.address;
 | |
|               if assigned(r^.symbol) then
 | |
|                begin
 | |
|                  if (r^.symbol.bind=AB_LOCAL) then
 | |
|                   relsym:=sects[r^.symbol.section].secsymidx
 | |
|                  else
 | |
|                   begin
 | |
|                     if r^.symbol.idx=-1 then
 | |
|                       internalerror(4321);
 | |
|                     relsym:=(r^.symbol.idx+initsym);
 | |
|                   end;
 | |
|                end
 | |
|               else
 | |
|                if r^.section<>sec_none then
 | |
|                 relsym:=sects[r^.section].secsymidx
 | |
|                else
 | |
|                 relsym:=SHN_UNDEF;
 | |
|               case r^.typ of
 | |
|                 relative_true :
 | |
|                   reltyp:=R_386_PC32;
 | |
|                 relative_false :
 | |
|                   reltyp:=R_386_32;
 | |
|               end;
 | |
|               rel.info:=(relsym shl 8) or reltyp;
 | |
|               { write reloc }
 | |
|               s.relocsect.write(rel,sizeof(rel));
 | |
|               { goto next and dispose this reloc }
 | |
|               hr:=r;
 | |
|               r:=r^.next;
 | |
|               dispose(hr);
 | |
|             end;
 | |
|          end;
 | |
|       end;
 | |
| 
 | |
| 
 | |
|     procedure telf32objectoutput.createsymtab;
 | |
|       var
 | |
|         elfsym : telf32symbol;
 | |
|         sym : toutputsymbol;
 | |
|         sec : tsection;
 | |
|         locals,
 | |
|         i : longint;
 | |
|       begin
 | |
|         with telf32data(data) 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 }
 | |
|            for sec:=low(tsection) to high(tsection) do
 | |
|             if assigned(sects[sec]) then
 | |
|              begin
 | |
|                fillchar(elfsym,sizeof(elfsym),0);
 | |
|                elfsym.st_name:=telf32section(sects[sec]).shstridx;
 | |
|                elfsym.st_info:=STT_SECTION;
 | |
|                elfsym.st_shndx:=telf32section(sects[sec]).secshidx;
 | |
|                symtabsect.write(elfsym,sizeof(elfsym));
 | |
|                inc(locals);
 | |
|              end;
 | |
|          { symbols }
 | |
|            Syms.seek(0);
 | |
|            for i:=1 to (Syms.size div sizeof(toutputsymbol)) do
 | |
|             begin
 | |
|               Syms.read(sym,sizeof(toutputsymbol));
 | |
|               fillchar(elfsym,sizeof(elfsym),0);
 | |
|               elfsym.st_name:=sym.nameidx;
 | |
|               elfsym.st_value:=sym.value;
 | |
|               elfsym.st_size:=sym.size;
 | |
|               case sym.bind 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.bind<>AB_EXTERNAL 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.bind=AB_COMMON then
 | |
|                elfsym.st_shndx:=SHN_COMMON
 | |
|               else
 | |
|                if assigned(sects[sym.section]) then
 | |
|                 elfsym.st_shndx:=telf32section(sects[sym.section]).secshidx
 | |
|                else
 | |
|                 elfsym.st_shndx:=SHN_UNDEF;
 | |
|               symtabsect.write(elfsym,sizeof(elfsym));
 | |
|             end;
 | |
|          { update the .symtab section header }
 | |
|            symtabsect.shlink:=strtabsect.secshidx;
 | |
|            symtabsect.shinfo:=locals;
 | |
|          end;
 | |
|       end;
 | |
| 
 | |
| 
 | |
|     procedure telf32objectoutput.createshstrtab;
 | |
|       var
 | |
|         sec : tsection;
 | |
|       begin
 | |
|         with telf32data(data) do
 | |
|          begin
 | |
|            with shstrtabsect do
 | |
|             begin
 | |
|               writestr(#0);
 | |
|               symtabsect.shstridx:=writestr('.symtab'#0);
 | |
|               strtabsect.shstridx:=writestr('.strtab'#0);
 | |
|               shstrtabsect.shstridx:=writestr('.shstrtab'#0);
 | |
|               for sec:=low(tsection) to high(tsection) do
 | |
|                if assigned(sects[sec]) then
 | |
|                 begin
 | |
|                   telf32section(sects[sec]).shstridx:=writestr(sects[sec].name+#0);
 | |
|                   if assigned(telf32section(sects[sec]).relocsect) then
 | |
|                    telf32section(sects[sec]).relocsect.shstridx:=writestr(telf32section(sects[sec]).relocsect.name+#0);
 | |
|                 end;
 | |
|             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.writetodisk;
 | |
|       var
 | |
|         header : telf32header;
 | |
|         datapos,
 | |
|         shoffset,
 | |
|         nsects : longint;
 | |
|         hstab  : telf32stab;
 | |
|         sec    : tsection;
 | |
|         empty  : array[0..63] of byte;
 | |
|         hp     : pdynamicblock;
 | |
|       begin
 | |
|         with telf32data(data) do
 | |
|          begin
 | |
|          { calc amount of sections we have }
 | |
|            fillchar(empty,sizeof(empty),0);
 | |
|            nsects:=1;
 | |
|            initsym:=2;
 | |
|            for sec:=low(tsection) to high(tsection) do
 | |
|             if assigned(sects[sec]) then
 | |
|              begin
 | |
|                { each section requires a symbol for relocation }
 | |
|                sects[sec].secsymidx:=initsym;
 | |
|                inc(initsym);
 | |
|                { also create the index in the section header table }
 | |
|                telf32section(sects[sec]).secshidx:=nsects;
 | |
|                inc(nsects);
 | |
|                if assigned(sects[sec].relochead) then
 | |
|                 inc(nsects);
 | |
|              end;
 | |
|            { 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(sects[sec_stab]) then
 | |
|             begin
 | |
|               hstab.strpos:=1;
 | |
|               hstab.ntype:=0;
 | |
|               hstab.nother:=0;
 | |
|               hstab.ndesc:=(sects[sec_stab].datasize div sizeof(telf32stab))-1{+1 according to gas output PM};
 | |
|               hstab.nvalue:=sects[sec_stabstr].datasize;
 | |
|               sects[sec_stab].Data.seek(0);
 | |
|               sects[sec_stab].Data.write(hstab,sizeof(hstab));
 | |
|             end;
 | |
|          { Create the relocation sections }
 | |
|            for sec:=low(tsection) to high(tsection) do
 | |
|             if assigned(sects[sec]) and
 | |
|                (sects[sec].nrelocs>0) then
 | |
|               createrelocsection(telf32section(sects[sec]));
 | |
|          { create .symtab }
 | |
|            createsymtab;
 | |
|          { create .shstrtab }
 | |
|            createshstrtab;
 | |
|          { Calculate the filepositions }
 | |
|            datapos:=$40; { elfheader + alignment }
 | |
|            { sections first }
 | |
|            for sec:=low(tsection) to high(tsection) do
 | |
|             if assigned(sects[sec]) then
 | |
|              begin
 | |
|                sects[sec].datapos:=datapos;
 | |
|                if assigned(sects[sec].data) then
 | |
|                  inc(datapos,sects[sec].aligneddatasize);
 | |
|              end;
 | |
|            { shstrtab }
 | |
|            shstrtabsect.datapos:=datapos;
 | |
|            inc(datapos,shstrtabsect.aligneddatasize);
 | |
|            { section headers }
 | |
|            shoffset:=datapos;
 | |
|            inc(datapos,nsects*sizeof(telf32sechdr));
 | |
|            { symtab }
 | |
|            symtabsect.datapos:=datapos;
 | |
|            inc(datapos,symtabsect.aligneddatasize);
 | |
|            { strtab }
 | |
|            strtabsect.datapos:=datapos;
 | |
|            inc(datapos,align(strtabsect.datasize,4));
 | |
|            { .rel sections }
 | |
|            for sec:=low(tsection) to high(tsection) do
 | |
|             if assigned(sects[sec]) and
 | |
|                assigned(telf32section(sects[sec]).relocsect) then
 | |
|              begin
 | |
|                telf32section(sects[sec]).relocsect.datapos:=datapos;
 | |
|                inc(datapos,telf32section(sects[sec]).relocsect.aligneddatasize);
 | |
|              end;
 | |
|          { 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 }
 | |
|            for sec:=low(tsection) to high(tsection) do
 | |
|             if assigned(sects[sec]) and
 | |
|                assigned(sects[sec].data) then
 | |
|              begin
 | |
|                sects[sec].alignsection;
 | |
|                hp:=sects[sec].Data.firstblock;
 | |
|                while assigned(hp) do
 | |
|                 begin
 | |
|                   writer.write(hp^.data,hp^.used);
 | |
|                   hp:=hp^.next;
 | |
|                 end;
 | |
|              end;
 | |
|          { .shstrtab }
 | |
|            shstrtabsect.alignsection;
 | |
|            hp:=shstrtabsect.Data.firstblock;
 | |
|            while assigned(hp) do
 | |
|             begin
 | |
|               writer.write(hp^.data,hp^.used);
 | |
|               hp:=hp^.next;
 | |
|             end;
 | |
|          { section headers, start with an empty header for sh_undef }
 | |
|            writer.write(empty,sizeof(telf32sechdr));
 | |
|            for sec:=low(tsection) to high(tsection) do
 | |
|             if assigned(sects[sec]) then
 | |
|              begin
 | |
|                writesectionheader(telf32section(sects[sec]));
 | |
|                if assigned(telf32section(sects[sec]).relocsect) then
 | |
|                 writesectionheader(telf32section(sects[sec]).relocsect);
 | |
|              end;
 | |
|            writesectionheader(shstrtabsect);
 | |
|            writesectionheader(symtabsect);
 | |
|            writesectionheader(strtabsect);
 | |
|          { .symtab }
 | |
|            symtabsect.alignsection;
 | |
|            hp:=symtabsect.Data.firstblock;
 | |
|            while assigned(hp) do
 | |
|             begin
 | |
|               writer.write(hp^.data,hp^.used);
 | |
|               hp:=hp^.next;
 | |
|             end;
 | |
|          { .strtab }
 | |
|            strtabsect.writealign(4);
 | |
|            hp:=strtabsect.Data.firstblock;
 | |
|            while assigned(hp) do
 | |
|             begin
 | |
|               writer.write(hp^.data,hp^.used);
 | |
|               hp:=hp^.next;
 | |
|             end;
 | |
|          { .rel sections }
 | |
|            for sec:=low(tsection) to high(tsection) do
 | |
|             if assigned(sects[sec]) and
 | |
|                assigned(telf32section(sects[sec]).relocsect) then
 | |
|              begin
 | |
|                telf32section(sects[sec]).relocsect.alignsection;
 | |
|                hp:=telf32section(sects[sec]).relocsect.Data.firstblock;
 | |
|                while assigned(hp) do
 | |
|                 begin
 | |
|                   writer.write(hp^.data,hp^.used);
 | |
|                   hp:=hp^.next;
 | |
|                 end;
 | |
|              end;
 | |
|          end;
 | |
|       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 : target_any;  //target_i386_linux;
 | |
|             outputbinary : true;
 | |
|             allowdirect : false;
 | |
|             externals : true;
 | |
|             needar : false;
 | |
|             labelprefix_only_inside_procedure: false;
 | |
|             labelprefix : '.L';
 | |
|             comment : '';
 | |
|             secnames : ('',
 | |
|               '.text','.data','.bss',
 | |
|               '.idata$2','.idata$4','.idata$5','.idata$6','.idata$7','.edata',
 | |
|               '.stab','.stabstr')
 | |
|           );
 | |
| 
 | |
| 
 | |
| initialization
 | |
|   RegisterAssembler(as_i386_elf32_info,TElf32Assembler);
 | |
| end.
 | |
| {
 | |
|   $Log$
 | |
|   Revision 1.10  2001-05-06 17:13:23  jonas
 | |
|     * completed incomplete typed constant records
 | |
| 
 | |
|   Revision 1.9  2001/05/04 19:50:58  peter
 | |
|     * finally added the missing outputbinary field that was missing
 | |
| 
 | |
|   Revision 1.8  2001/04/18 22:01:54  peter
 | |
|     * registration of targets and assemblers
 | |
| 
 | |
|   Revision 1.7  2001/04/13 01:22:10  peter
 | |
|     * symtable change to classes
 | |
|     * range check generation and errors fixed, make cycle DEBUG=1 works
 | |
|     * memory leaks fixed
 | |
| 
 | |
|   Revision 1.6  2001/03/05 21:40:39  peter
 | |
|     * more things for tcoffobjectinput
 | |
| 
 | |
|   Revision 1.5  2000/12/25 00:07:26  peter
 | |
|     + new tlinkedlist class (merge of old tstringqueue,tcontainer and
 | |
|       tlinkedlist objects)
 | |
| 
 | |
|   Revision 1.4  2000/12/24 12:25:32  peter
 | |
|     + cstreams unit
 | |
|     * dynamicarray object to class
 | |
| 
 | |
|   Revision 1.3  2000/12/23 19:59:35  peter
 | |
|     * object to class for ow/og objects
 | |
|     * split objectdata from objectoutput
 | |
| 
 | |
|   Revision 1.2  2000/11/12 22:45:14  peter
 | |
|     * moved setting of stab hdrsym
 | |
| 
 | |
|   Revision 1.1  2000/11/12 22:20:37  peter
 | |
|     * create generic toutputsection for binary writers
 | |
| 
 | |
| }
 | 
