gem5/base/loader/ecoff_object.cc

/*
 * Copyright (c) 2003 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.
 */

#include <string>

#include "ecoff_object.hh"

#include "functional_memory.hh"
#include "symtab.hh"

#include "trace.hh"	// for DPRINTF

#include "exec_ecoff.h"
#include "coff_sym.h"
#include "coff_symconst.h"

using namespace std;

ObjectFile *
EcoffObject::tryFile(const string &fname, int fd, size_t len, uint8_t *data)
{
    if (((ecoff_filehdr *)data)->f_magic == ECOFF_MAGIC_ALPHA) {
        // it's Alpha ECOFF
        return new EcoffObject(fname, fd, len, data);
    }
    else {
        return NULL;
    }
}


EcoffObject::EcoffObject(const string &_filename, int _fd,
                         size_t _len, uint8_t *_data)
    : ObjectFile(_filename, _fd, _len, _data)
{
    execHdr = (ecoff_exechdr *)fileData;
    fileHdr = &(execHdr->f);
    aoutHdr = &(execHdr->a);

    entry = aoutHdr->entry;

    text.baseAddr = aoutHdr->text_start;
    text.size = aoutHdr->tsize;

    data.baseAddr = aoutHdr->data_start;
    data.size = aoutHdr->dsize;

    bss.baseAddr = aoutHdr->bss_start;
    bss.size = aoutHdr->bsize;

    DPRINTFR(Loader, "text: 0x%x %d\ndata: 0x%x %d\nbss: 0x%x %d\n",
             text.baseAddr, text.size, data.baseAddr, data.size,
             bss.baseAddr, bss.size);
}


bool
EcoffObject::loadSections(FunctionalMemory *mem, bool loadPhys)
{
    Addr textAddr = text.baseAddr;
    Addr dataAddr = data.baseAddr;

    if (loadPhys) {
        textAddr &= (ULL(1) << 40) - 1;
        dataAddr &= (ULL(1) << 40) - 1;
    }

    // Since we don't really have an MMU and all memory is
    // zero-filled, there's no need to set up the BSS segment.
    mem->prot_write(textAddr, fileData + ECOFF_TXTOFF(execHdr), text.size);
    mem->prot_write(dataAddr, fileData + ECOFF_DATOFF(execHdr), data.size);

    return true;
}


bool
EcoffObject::loadGlobalSymbols(SymbolTable *symtab)
{
    if (!symtab)
        return false;

    if (fileHdr->f_magic != ECOFF_MAGIC_ALPHA) {
        cprintf("wrong magic\n");
        return false;
    }

    ecoff_symhdr *syms = (ecoff_symhdr *)(fileData + fileHdr->f_symptr);
    if (syms->magic != magicSym2) {
        cprintf("bad symbol header magic\n");
        exit(1);
    }

    ecoff_extsym *ext_syms = (ecoff_extsym *)(fileData + syms->cbExtOffset);

    char *ext_strings = (char *)(fileData + syms->cbSsExtOffset);
    for (int i = 0; i < syms->iextMax; i++) {
        ecoff_sym *entry = &(ext_syms[i].asym);
        if (entry->iss != -1)
            symtab->insert(entry->value, ext_strings + entry->iss);
    }

    return true;
}

bool
EcoffObject::loadLocalSymbols(SymbolTable *symtab)
{
    if (!symtab)
        return false;

    if (fileHdr->f_magic != ECOFF_MAGIC_ALPHA) {
        cprintf("wrong magic\n");
        return false;
    }

    ecoff_symhdr *syms = (ecoff_symhdr *)(fileData + fileHdr->f_symptr);
    if (syms->magic != magicSym2) {
        cprintf("bad symbol header magic\n");
        exit(1);
    }

    ecoff_sym *local_syms = (ecoff_sym *)(fileData + syms->cbSymOffset);
    char *local_strings = (char *)(fileData + syms->cbSsOffset);
    ecoff_fdr *fdesc = (ecoff_fdr *)(fileData + syms->cbFdOffset);

    for (int i = 0; i < syms->ifdMax; i++) {
        ecoff_sym *entry = (ecoff_sym *)(local_syms + fdesc[i].isymBase);
        char *strings = (char *)(local_strings + fdesc[i].issBase);
        for (int j = 0; j < fdesc[i].csym; j++) {
            if (entry[j].st == stGlobal || entry[j].st == stProc)
                if (entry[j].iss != -1)
                    symtab->insert(entry[j].value, strings + entry[j].iss);
        }
    }

    for (int i = 0; i < syms->isymMax; i++) {
        ecoff_sym *entry = &(local_syms[i]);
        if (entry->st == stProc)
            symtab->insert(entry->value, local_strings + entry->iss);
    }

    return true;
}