1  /* BFD back-end definitions used by all NetBSD targets.
       2     Copyright (C) 1990-2023 Free Software Foundation, Inc.
       3  
       4     This file is part of BFD, the Binary File Descriptor library.
       5  
       6     This program is free software; you can redistribute it and/or modify
       7     it under the terms of the GNU General Public License as published by
       8     the Free Software Foundation; either version 3 of the License, or
       9     (at your option) any later version.
      10  
      11     This program is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14     GNU General Public License for more details.
      15  
      16     You should have received a copy of the GNU General Public License
      17     along with this program; if not, write to the Free Software
      18     Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
      19     MA 02110-1301, USA.  */
      20  
      21  
      22  /* Check for our machine type (part of magic number).  */
      23  #ifndef MACHTYPE_OK
      24  #define MACHTYPE_OK(m) ((m) == DEFAULT_MID || (m) == M_UNKNOWN)
      25  #endif
      26  
      27  /* This is the normal load address for executables.  */
      28  #define TEXT_START_ADDR		TARGET_PAGE_SIZE
      29  
      30  /* NetBSD ZMAGIC has its header in the text segment.  */
      31  #define N_HEADER_IN_TEXT(x)	1
      32  
      33  /* Determine if this is a shared library using the flags.  */
      34  #define N_SHARED_LIB(x)		(N_DYNAMIC (x))
      35  
      36  /* We have 6 bits of flags and 10 bits of machine ID.  */
      37  #define N_MACHTYPE(execp) \
      38  	((enum machine_type) (((execp)->a_info >> 16) & 0x03ff))
      39  #define N_FLAGS(execp) \
      40  	(((execp)->a_info >> 26) & 0x3f)
      41  
      42  #define N_SET_INFO(execp, magic, type, flags) \
      43  	((execp)->a_info = ((magic) & 0xffff) \
      44  	 | (((int) (type) & 0x3ff) << 16) \
      45  	 | (((flags) & 0x3f) << 24))
      46  #define N_SET_MACHTYPE(execp, machtype) \
      47  	((execp)->a_info = \
      48  	 ((execp)->a_info & 0xfb00ffff) | ((((int) (machtype)) & 0x3ff) << 16))
      49  #define N_SET_FLAGS(execp, flags) \
      50  	((execp)->a_info = \
      51  	 ((execp)->a_info & 0x03ffffff) | ((flags & 0x3fu) << 26))
      52  
      53  #include "sysdep.h"
      54  #include "bfd.h"
      55  #include "libbfd.h"
      56  #include "libaout.h"
      57  
      58  /* On NetBSD, the magic number is always in ntohl's "network" (big-endian)
      59     format.  */
      60  #define SWAP_MAGIC(ext) bfd_getb32 (ext)
      61  
      62  /* On NetBSD, the entry point may be taken to be the start of the text
      63     section.  */
      64  #define MY_entry_is_text_address 1
      65  
      66  #define MY_write_object_contents MY (write_object_contents)
      67  static bool MY (write_object_contents) (bfd *);
      68  
      69  #define MY_text_includes_header 1
      70  
      71  #include "aout-target.h"
      72  
      73  /* Write an object file.
      74     Section contents have already been written.  We write the
      75     file header, symbols, and relocation.  */
      76  
      77  static bool
      78  MY (write_object_contents) (bfd *abfd)
      79  {
      80    struct external_exec exec_bytes;
      81    struct internal_exec *execp = exec_hdr (abfd);
      82  
      83    /* We must make certain that the magic number has been set.  This
      84       will normally have been done by set_section_contents, but only if
      85       there actually are some section contents.  */
      86    if (! abfd->output_has_begun)
      87      NAME (aout, adjust_sizes_and_vmas) (abfd);
      88  
      89    obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
      90  
      91    /* Magic number, maestro, please!  */
      92    switch (bfd_get_arch(abfd))
      93      {
      94      case DEFAULT_ARCH:
      95        N_SET_MACHTYPE (execp, DEFAULT_MID);
      96        break;
      97      default:
      98        N_SET_MACHTYPE (execp, M_UNKNOWN);
      99        break;
     100      }
     101  
     102    /* The NetBSD magic number is always big-endian.  */
     103  #ifndef TARGET_IS_BIG_ENDIAN_P
     104    /* XXX aren't there any macro to change byteorder of a word independent of
     105       the host's or target's endiannesses?  */
     106    execp->a_info
     107      = (execp->a_info & 0xffu) << 24 | (execp->a_info & 0xff00) << 8
     108        | (execp->a_info & 0xff0000) >> 8 | (execp->a_info & 0xff000000) >> 24;
     109  #endif
     110  
     111    WRITE_HEADERS (abfd, execp);
     112  
     113    return true;
     114  }