/*****************************************************************************************
 Copyright (c) 2002-2004 The UbixOS Project
 All rights reserved.

 Redistribution and use in source and binary forms, with or without modification, are
 permitted provided that the following conditions are met:

 Redistributions of source code must retain the above copyright notice, this list of
 conditions, the following disclaimer and the list of authors.  Redistributions in binary
 form must reproduce the above copyright notice, this list of conditions, the following
 disclaimer and the list of authors in the documentation and/or other materials provided
 with the distribution. Neither the name of the UbixOS Project nor the names of its
 contributors may be used to endorse or promote products derived from this software
 without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 $Id$

*****************************************************************************************/

#include <ubixos/types.h>
#include <ubixos/ld.h>
#include <ubixos/sched.h>
#include <ubixos/elf.h>
#include <lib/kprintf.h>
#include <lib/kmalloc.h>
#include <vfs/vfs.h>
#include <vmm/vmm.h>
#include <string.h>

uInt32 ldEnable() {
  int               i             = 0x0;
  int               x             = 0x0;
  int               rel           = 0x0;
  int               sym           = 0x0;
  char             *newLoc        = 0x0; 
  char             *shStr         = 0x0;
  char             *dynStr        = 0x0;
  uInt32           *reMap         = 0x0;
  fileDescriptor   *ldFd          = 0x0;
  elfHeader        *binaryHeader  = 0x0;
  elfProgramHeader *programHeader = 0x0;
  elfSectionHeader *sectionHeader = 0x0;
  elfDynSym        *relSymTab     = 0x0;
  elfPltInfo       *elfRel        = 0x0;

  ldFd = fopen("ld.so","rb");

  if (ldFd == 0x0) {
    kprintf("Can not open ld.so\n");
    }
 
  fseek(ldFd,0x0,0x0);
  binaryHeader = (elfHeader *)kmalloc(sizeof(elfHeader));
  fread(binaryHeader,sizeof(elfHeader),1,ldFd);

  programHeader = (elfProgramHeader *)kmalloc(sizeof(elfProgramHeader)*binaryHeader->ePhnum);
  fseek(ldFd,binaryHeader->ePhoff,0);
  fread(programHeader,sizeof(elfSectionHeader),binaryHeader->ePhnum,ldFd);

  sectionHeader = (elfSectionHeader *)kmalloc(sizeof(elfSectionHeader)*binaryHeader->eShnum);
  fseek(ldFd,binaryHeader->eShoff,0);
  fread(sectionHeader,sizeof(elfSectionHeader),binaryHeader->eShnum,ldFd);

  shStr = (char *)kmalloc(sectionHeader[binaryHeader->eShstrndx].shSize);
  fseek(ldFd,sectionHeader[binaryHeader->eShstrndx].shOffset,0);
  fread(shStr,sectionHeader[binaryHeader->eShstrndx].shSize,1,ldFd);

  for (i=0;i<binaryHeader->ePhnum;i++) {
    switch (programHeader[i].phType) {
      case 1:
      case 2:
        newLoc = (char *)programHeader[i].phVaddr + LD_START;
        /*
        Allocate Memory Im Going To Have To Make This Load Memory With Correct
        Settings so it helps us in the future
        */
        for (x=0;x < ((programHeader[i].phMemsz)+4095);x += 0x1000) {
          vmmRemapPage(vmmFindFreePage(_current->id),((programHeader[i].phVaddr & 0xFFFFF000) + x + LD_START));
          kmemset(((programHeader[i].phVaddr & 0xFFFFF000) + x + LD_START),0x0,0x1000);
          }
        /* Now Load Section To Memory */
        fseek(ldFd,programHeader[i].phOffset,0x0);
        fread(newLoc,programHeader[i].phFilesz,1,ldFd);
        break;
      default:
        kprintf("Unhandled Header\n");
        break;
      }
    }

  for (i=0x0;i<binaryHeader->eShnum;i++) {
    switch (sectionHeader[i].shType) {
     case 3:
        if (!kstrcmp((shStr + sectionHeader[i].shName),".dynstr")) {
          dynStr = (char *)kmalloc(sectionHeader[i].shSize);
          fseek(ldFd,sectionHeader[i].shOffset,0x0);
          fread(dynStr,sectionHeader[i].shSize,1,ldFd);
          }
        break;
      case 9:
        elfRel = (elfPltInfo *)kmalloc(sectionHeader[i].shSize);
        fseek(ldFd,sectionHeader[i].shOffset,0x0);
        fread(elfRel,sectionHeader[i].shSize,1,ldFd);

        for (x=0x0;x<sectionHeader[i].shSize/sizeof(elfPltInfo);x++) {
          rel = ELF32_R_SYM(elfRel[x].pltInfo);
          reMap = (uInt32 *)((uInt32)LD_START + elfRel[x].pltOffset);
          switch (ELF32_R_TYPE(elfRel[x].pltInfo)) {
            case R_386_32:
              *reMap += ((uInt32)LD_START + relSymTab[rel].dynValue);
              break;
            case R_386_PC32:
              *reMap += ((uInt32)LD_START + relSymTab[rel].dynValue) - (uInt32)reMap;
              break;
            case R_386_RELATIVE:
              *reMap += (uInt32)LD_START;
              break;
            default:
              kprintf("[0x%X][0x%X](%i)[%s]\n",elfRel[x].pltOffset,elfRel[x].pltInfo,rel,elfGetRelType(ELF32_R_TYPE(elfRel[x].pltInfo)));
              kprintf("relTab [%s][0x%X][0x%X]\n",dynStr + relSymTab[rel].dynName,relSymTab[rel].dynValue,relSymTab[rel].dynName);
              break;
            }
          }
        kfree(elfRel);
        break;
      case 11:
        relSymTab = (elfDynSym *)kmalloc(sectionHeader[i].shSize);
        fseek(ldFd,sectionHeader[i].shOffset,0x0);
        fread(relSymTab,sectionHeader[i].shSize,1,ldFd);
        sym = i;
        break;
      }
    }

  i = binaryHeader->eEntry + LD_START;

  kfree(dynStr);
  kfree(shStr);
  kfree(relSymTab);
  kfree(sectionHeader);
  kfree(programHeader);
  kfree(binaryHeader);
  fclose(ldFd);

  return((uInt32)i);
  }

/***
 $Log$
 Revision 1.26  2004/06/18 15:18:05  reddawg
 bug fixes: did some double checking on pointers and 0x0 out memory

 Revision 1.25  2004/06/17 13:16:55  reddawg
 debug: removed all dead debug code

 Revision 1.24  2004/06/17 13:05:14  reddawg
 dynamic linking: fixed int6 issue problem was multiple rel's

 Revision 1.23  2004/06/17 12:51:27  reddawg
 try now

 Revision 1.22  2004/06/17 12:43:59  reddawg
 debug: show me output from this

 Revision 1.21  2004/06/17 12:39:30  reddawg
 ok

 Revision 1.20  2004/06/17 12:35:15  reddawg
 Test

 Revision 1.19  2004/06/17 12:28:56  reddawg
 debug: show me the output after this is a tested

 Revision 1.18  2004/06/17 02:58:49  reddawg
 Cleaned Out Dead Code

 Revision 1.17  2004/06/17 02:19:29  reddawg
 Cleaning out dead code

 Revision 1.16  2004/06/17 01:52:54  reddawg
 Maybe?

 Revision 1.15  2004/06/17 01:23:23  reddawg
 Do This

 Revision 1.14  2004/06/17 01:09:25  reddawg
 TCA: cvs update make and give me output

 Revision 1.13  2004/06/16 19:45:11  reddawg
 Cleaned Up Code

 Revision 1.12  2004/06/16 17:49:02  reddawg
 Fixed typo printf <--> kprintf

 Revision 1.11  2004/06/16 17:46:42  reddawg
 Cleaned Dead Code

 Revision 1.10  2004/06/16 17:32:14  reddawg
 Removed Dead LD Code now part of ld.so

 Revision 1.9  2004/06/16 17:04:13  reddawg
 ld.so: rest of the commit

 Revision 1.6  2004/06/14 12:20:54  reddawg
 notes: many bugs repaired and ld works 100% now.

 Revision 1.5  2004/06/13 03:05:15  reddawg
 we now have a dynamic linker

 Revision 1.4  2004/06/12 01:27:26  reddawg
 shared objects: yes we almost fully support shared objects

 Revision 1.3  2004/05/15 02:30:28  reddawg
 Lots of changes

 END
 ***/