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  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  *  elf.c - A function to decode a PPC Linux Kernel.
  24  *
  25  *  Copyright (c) 2000 Apple Computer, Inc.
  26  *
  27  *  DRI: Josh de Cesare
  28  */
  29
  30 #include <sl.h>
  31
  32 #include "elf.h"
  33
  34 // Public Functions
  35
  36 long ThinFatBinaryElf(void **binary, unsigned long *length)
  37 {
  38   return -1;
  39 }
  40
  41 long DecodeElf(void *binary)
  42 {
  43   ElfHeaderPtr     ehPtr;
  44   ProgramHeaderPtr phPtr;
  45   long             cnt, paddr, offset, memsz, filesz, entry, *tmp;
  46
  47   ehPtr = (ElfHeaderPtr)binary;
  48   if (ehPtr->signature != kElfSignature) return 0;
  49
  50   entry = ehPtr->entry & kElfAddressMask;
  51
  52   for (cnt = 0; cnt < ehPtr->phnum; cnt++) {
  53     phPtr = (ProgramHeaderPtr)((unsigned long)binary + ehPtr->phoff + cnt * ehPtr->phentsize);
  54
  55     if (phPtr->type == kElfProgramTypeLoad) {
  56       paddr = phPtr->paddr & kElfAddressMask;
  57       offset = phPtr->offset;
  58       filesz = phPtr->filesz;
  59       memsz = phPtr->memsz;
  60
  61       // Get the actual entry if it is in this program.
  62       if ((entry >= paddr) && (entry < (paddr + filesz))) {
  63         tmp = (long *)((unsigned long)binary + offset + entry);
  64         if (tmp[2] == 0) entry +=  tmp[0];
  65
  66       }
  67       entry += paddr;
  68
  69       // Add the kernel to the memory-map.
  70       AllocateMemoryRange("Kernel-PROGRAM", 0, memsz);
  71
  72       // Set the last address used by the kernel program.
  73       AllocateKernelMemory(paddr + memsz);
  74
  75       if (paddr < kImageAddr) {
  76         // Copy the Vectors out of the way.
  77         bcopy((char *)((unsigned long)binary + offset), gVectorSaveAddr,
  78               kVectorSize - paddr);
  79
  80         offset += kImageAddr - paddr;
  81         filesz -= kImageAddr - paddr;
  82         paddr = kImageAddr;
  83       }
  84
  85       // Move the program.
  86       bcopy((char *)((unsigned long)binary + offset), (char *)paddr, filesz);
  87     }
  88   }
  89
  90   return 0;
  91 }