gcc/config/arm/crtn.asm

   1 #   Copyright (C) 2001, 2004 Free Software Foundation, Inc.
   2 #   Written By Nick Clifton
   3 #
   4 # This file is free software; you can redistribute it and/or modify it
   5 # under the terms of the GNU General Public License as published by the
   6 # Free Software Foundation; either version 2, or (at your option) any
   7 # later version.
   8 #
   9 # In addition to the permissions in the GNU General Public License, the
  10 # Free Software Foundation gives you unlimited permission to link the
  11 # compiled version of this file with other programs, and to distribute
  12 # those programs without any restriction coming from the use of this
  13 # file.  (The General Public License restrictions do apply in other
  14 # respects; for example, they cover modification of the file, and
  15 # distribution when not linked into another program.)
  16 #
  17 # This file is distributed in the hope that it will be useful, but
  18 # WITHOUT ANY WARRANTY; without even the implied warranty of
  19 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20 # General Public License for more details.
  21 #
  22 # You should have received a copy of the GNU General Public License
  23 # along with this program; see the file COPYING.  If not, write to
  24 # the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  25 # Boston, MA 02110-1301, USA.
  26 #
  27 #    As a special exception, if you link this library with files
  28 #    compiled with GCC to produce an executable, this does not cause
  29 #    the resulting executable to be covered by the GNU General Public License.
  30 #    This exception does not however invalidate any other reasons why
  31 #    the executable file might be covered by the GNU General Public License.
  32 #
  33
  34 /* An executable stack is *not* required for these functions.  */
  35 #if defined(__ELF__) && defined(__linux__)
  36 .section .note.GNU-stack,"",%progbits
  37 .previous
  38 #endif
  39
  40 # This file just makes sure that the .fini and .init sections do in
  41 # fact return.  Users may put any desired instructions in those sections.
  42 # This file is the last thing linked into any executable.
  43
  44         # Note - this macro is complemented by the FUNC_START macro
  45         # in crti.asm.  If you change this macro you must also change
  46         # that macro match.
  47         #
  48         # Note - we do not try any fancy optimizations of the return
  49         # sequences here, it is just not worth it.  Instead keep things
  50         # simple.  Restore all the save resgisters, including the link
  51         # register and then perform the correct function return instruction.
  52         # We also save/restore r3 to ensure stack alignment.
  53 .macro FUNC_END
  54 #ifdef __thumb__
  55         .thumb
  56
  57         pop     {r3, r4, r5, r6, r7}
  58         pop     {r3}
  59         mov     lr, r3
  60 #else
  61         .arm
  62
  63         sub     sp, fp, #40
  64         ldmfd   sp, {r4, r5, r6, r7, r8, r9, sl, fp, sp, lr}
  65 #endif
  66
  67 #if defined __THUMB_INTERWORK__ || defined __thumb__
  68         bx      lr
  69 #else
  70         mov     pc, lr
  71 #endif
  72 .endm
  73
  74
  75         .file           "crtn.asm"
  76
  77         .section        ".init"
  78         ;;
  79         FUNC_END
  80
  81         .section        ".fini"
  82         ;;
  83         FUNC_END
  84
  85 # end of crtn.asm