base/loader/aout_object.cc

   1 /*
   2  * Copyright (c) 2003 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <string>
  30
  31 #include "base/loader/aout_object.hh"
  32
  33 #include "mem/functional/functional.hh"
  34 #include "base/loader/symtab.hh"
  35
  36 #include "base/trace.hh"        // for DPRINTF
  37
  38 #include "base/loader/exec_aout.h"
  39
  40 using namespace std;
  41
  42 ObjectFile *
  43 AoutObject::tryFile(const string &fname, int fd, size_t len, uint8_t *data)
  44 {
  45     if (!N_BADMAG(*(aout_exechdr *)data)) {
  46         // right now this is only used for Alpha PAL code
  47         return new AoutObject(fname, fd, len, data,
  48                               ObjectFile::Alpha, ObjectFile::UnknownOpSys);
  49     }
  50     else {
  51         return NULL;
  52     }
  53 }
  54
  55
  56 AoutObject::AoutObject(const string &_filename, int _fd,
  57                        size_t _len, uint8_t *_data,
  58                        Arch _arch, OpSys _opSys)
  59     : ObjectFile(_filename, _fd, _len, _data, _arch, _opSys)
  60 {
  61     execHdr = (aout_exechdr *)fileData;
  62
  63     entry = execHdr->entry;
  64
  65     text.baseAddr = N_TXTADDR(*execHdr);
  66     text.size = execHdr->tsize;
  67
  68     data.baseAddr = N_DATADDR(*execHdr);
  69     data.size = execHdr->dsize;
  70
  71     bss.baseAddr = N_BSSADDR(*execHdr);
  72     bss.size = execHdr->bsize;
  73
  74     DPRINTFR(Loader, "text: 0x%x %d\ndata: 0x%x %d\nbss: 0x%x %d\n",
  75              text.baseAddr, text.size, data.baseAddr, data.size,
  76              bss.baseAddr, bss.size);
  77 }
  78
  79
  80 bool
  81 AoutObject::loadSections(FunctionalMemory *mem, bool loadPhys)
  82 {
  83     Addr textAddr = text.baseAddr;
  84     Addr dataAddr = data.baseAddr;
  85
  86     if (loadPhys) {
  87         textAddr &= (ULL(1) << 40) - 1;
  88         dataAddr &= (ULL(1) << 40) - 1;
  89     }
  90
  91     // Since we don't really have an MMU and all memory is
  92     // zero-filled, there's no need to set up the BSS segment.
  93     if (text.size != 0)
  94         mem->prot_write(textAddr, fileData + N_TXTOFF(*execHdr), text.size);
  95     if (data.size != 0)
  96         mem->prot_write(dataAddr, fileData + N_DATOFF(*execHdr), data.size);
  97
  98     return true;
  99 }
 100
 101
 102 bool
 103 AoutObject::loadGlobalSymbols(SymbolTable *symtab)
 104 {
 105     // a.out symbols not supported yet
 106     return false;
 107 }
 108
 109 bool
 110 AoutObject::loadLocalSymbols(SymbolTable *symtab)
 111 {
 112     // a.out symbols not supported yet
 113     return false;
 114 }