bootx.tproj/sl.subproj/elf.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  *  elf.c - A function to decode a PPC Linux Kernel.
  27  *
  28  *  Copyright (c) 2000 Apple Computer, Inc.
  29  *
  30  *  DRI: Josh de Cesare
  31  */
  32
  33 #include <sl.h>
  34
  35 #include "elf.h"
  36
  37 // Public Functions
  38
  39 long ThinFatBinaryElf(void **binary, unsigned long *length)
  40 {
  41   return -1;
  42 }
  43
  44 long DecodeElf(void *binary)
  45 {
  46   ElfHeaderPtr     ehPtr;
  47   ProgramHeaderPtr phPtr;
  48   long             cnt, paddr, offset, memsz, filesz, entry, *tmp;
  49
  50   ehPtr = (ElfHeaderPtr)binary;
  51   if (ehPtr->signature != kElfSignature) return 0;
  52
  53   entry = ehPtr->entry & kElfAddressMask;
  54
  55   for (cnt = 0; cnt < ehPtr->phnum; cnt++) {
  56     phPtr = (ProgramHeaderPtr)((unsigned long)binary + ehPtr->phoff + cnt * ehPtr->phentsize);
  57
  58     if (phPtr->type == kElfProgramTypeLoad) {
  59       paddr = phPtr->paddr & kElfAddressMask;
  60       offset = phPtr->offset;
  61       filesz = phPtr->filesz;
  62       memsz = phPtr->memsz;
  63
  64       // Get the actual entry if it is in this program.
  65       if ((entry >= paddr) && (entry < (paddr + filesz))) {
  66         tmp = (long *)((unsigned long)binary + offset + entry);
  67         if (tmp[2] == 0) entry +=  tmp[0];
  68
  69       }
  70       entry += paddr;
  71
  72       // Add the kernel to the memory-map.
  73       AllocateMemoryRange("Kernel-PROGRAM", 0, memsz);
  74
  75       // Set the last address used by the kernel program.
  76       AllocateKernelMemory(paddr + memsz);
  77
  78       if (paddr < kImageAddr) {
  79         // Copy the Vectors out of the way.
  80         bcopy((char *)((unsigned long)binary + offset), gVectorSaveAddr,
  81               kVectorSize - paddr);
  82
  83         offset += kImageAddr - paddr;
  84         filesz -= kImageAddr - paddr;
  85         paddr = kImageAddr;
  86       }
  87
  88       // Move the program.
  89       bcopy((char *)((unsigned long)binary + offset), (char *)paddr, filesz);
  90     }
  91   }
  92
  93   return 0;
  94 }