src/base/loader/aout_object.cc

/*
 * Copyright (c) 2003-2005 The Regents of The University of Michigan
 * 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 and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders 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.
 *
 * Authors: Steve Reinhardt
 */

#include "base/loader/aout_object.hh"

#include <string>

#include "base/loader/exec_aout.h"
#include "base/loader/symtab.hh"
#include "base/trace.hh"
#include "debug/Loader.hh"

using namespace std;

ObjectFile *
AoutObject::tryFile(const string &fname, size_t len, uint8_t *data)
{
    if (!N_BADMAG(*(aout_exechdr *)data)) {
        // right now this is only used for Alpha PAL code
        return new AoutObject(fname, len, data,
                              ObjectFile::Alpha, ObjectFile::UnknownOpSys);
    } else {
        return nullptr;
    }
}


AoutObject::AoutObject(const string &_filename,
                       size_t _len, uint8_t *_data,
                       Arch _arch, OpSys _opSys)
    : ObjectFile(_filename, _len, _data, _arch, _opSys)
{
    execHdr = (aout_exechdr *)fileData;
    entry = execHdr->entry;
}

MemoryImage
AoutObject::buildImage() const
{
    MemoryImage image({
            { "text", N_TXTADDR(*execHdr),
              fileData + N_TXTOFF(*execHdr), execHdr->tsize },
            { "data", N_DATADDR(*execHdr),
              fileData + N_DATOFF(*execHdr), execHdr->dsize },
            { "bss", N_BSSADDR(*execHdr), nullptr, execHdr->bsize}
    });

    for (auto &seg: image.segments())
        DPRINTFR(Loader, "%s\n", seg);
    return image;
}


bool
AoutObject::loadAllSymbols(SymbolTable *symtab, Addr base, Addr offset,
                           Addr addr_mask)
{
    return false;
}

bool
AoutObject::loadGlobalSymbols(SymbolTable *symtab, Addr base, Addr offset,
                              Addr addr_mask)
{
    // a.out symbols not supported yet
    return false;
}

bool
AoutObject::loadLocalSymbols(SymbolTable *symtab, Addr base, Addr offset,
                             Addr addr_mask)
{
    // a.out symbols not supported yet
    return false;
}