/*      $NetBSD: aout.c,v 1.12 2009/03/18 16:00:10 cegger Exp $ */

/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Leo Weppelman.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/


#ifdef TOSTOOLS
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <a_out.h>

#define MALLOC(x)       malloc(x)

#else

#include <lib/libsa/stand.h>
#include <atari_stand.h>
#include <libkern.h>
#include <sys/exec_aout.h>

#define MALLOC(x)       alloc(x)
#endif

#include "libtos.h"
#include "kparamb.h"
#include "tosdefs.h"
#include "cread.h"


#ifdef TOSTOOLS
/*
* Assume compiling under TOS or MINT. The page-size will always
* be incorrect then (if it is defined anyway).
*/
#ifdef AOUT_LDPGSZ
#undef AOUT_LDPGSZ
#endif

#define AOUT_LDPGSZ     (8*1024)        /* Page size for NetBSD         */

#endif /* TOSTOOLS */

/*
* Load an a.out image.
* Exit codes:
*      -1      : Not an a.outfile
*       0      : OK
*       error# : Error during load (*errp might contain error string).
*/
int
aout_load(int fd, osdsc_t *od, char **errp, int loadsyms)
{
       long            textsz, stringsz;
       struct exec     ehdr;
       int             err;

       *errp = NULL;

       lseek(fd, (off_t)0, SEEK_SET);
       if (read(fd, (char *)&ehdr, sizeof(ehdr)) != sizeof(ehdr))
               return -1;

#ifdef TOSTOOLS
       if ((ehdr.a_magic & 0xffff) != NMAGIC)
               return -1;
#else
       if ((N_GETMAGIC(ehdr) != NMAGIC) && (N_GETMAGIC(ehdr) != OMAGIC))
               return -1;
#endif

       /*
        * Extract various sizes from the kernel executable
        */
       textsz     = (ehdr.a_text + AOUT_LDPGSZ - 1) & ~(AOUT_LDPGSZ - 1);
       od->k_esym = 0;
       od->ksize  = textsz + ehdr.a_data + ehdr.a_bss;
       od->kentry = ehdr.a_entry;

       if (loadsyms && ehdr.a_syms) {
               err = 1;
               if (lseek(fd, ehdr.a_text+ehdr.a_data+ehdr.a_syms+sizeof(ehdr),
                         0) <= 0)
                       goto error;
               err = 2;
               if (read(fd, (char *)&stringsz, sizeof(long)) != sizeof(long))
                       goto error;
               err = 3;
               if (lseek(fd, sizeof(ehdr), 0) <= 0)
                       goto error;
               od->ksize += ehdr.a_syms + sizeof(long) + stringsz;
       }

       err = 4;
       if ((od->kstart = (u_char *)MALLOC(od->ksize)) == NULL)
               goto error;

       /*
        * Read text & data, clear bss
        */
       err = 5;
       if ((read(fd, (char *)(od->kstart), ehdr.a_text) != ehdr.a_text)
           ||(read(fd,(char *)(od->kstart+textsz),ehdr.a_data) != ehdr.a_data))
               goto error;
       memset(od->kstart + textsz + ehdr.a_data, 0, ehdr.a_bss);

       /*
        * Read symbol and string table
        */
       if (loadsyms && ehdr.a_syms) {
               long    *p;

               p = (long *)((od->kstart) + textsz + ehdr.a_data + ehdr.a_bss);
               *p++ = ehdr.a_syms;
               err = 6;
               if (read(fd, (char *)p, ehdr.a_syms) != ehdr.a_syms)
                       goto error;
               p = (long *)((char *)p + ehdr.a_syms);
               err = 7;
               if (read(fd, (char *)p, stringsz) != stringsz)
                       goto error;
               od->k_esym = (long)((char *)p-(char *)od->kstart +stringsz);
       }
       return 0;

error:
#ifdef TOSTOOLS
       {
               static char *errs[] = {
                       /* 1 */ "Cannot seek to string table",
                       /* 2 */ "Cannot read string-table size",
                       /* 3 */ "Cannot seek back to text start",
                       /* 4 */ "Cannot malloc kernel image space",
                       /* 5 */ "Unable to read kernel image",
                       /* 6 */ "Cannot read symbol table",
                       /* 7 */ "Cannot read string table"
               };
               *errp = errs[err];
       }
#endif /* TOSTOOLS */

       return err;
}