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      1 /* BFD back-end definitions used by all NetBSD targets.
      2    Copyright (C) 1990-2025 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 }
    115