libgcc/config/aarch64/crti.S

   1 # Machine description for AArch64 architecture.
   2 # Copyright (C) 2009-2023 Free Software Foundation, Inc.
   3 # Contributed by ARM Ltd.
   4 #
   5 # This file is free software; you can redistribute it and/or modify it
   6 # under the terms of the GNU General Public License as published by the
   7 # Free Software Foundation; either version 3, or (at your option) any
   8 # later version.
   9 #
  10 # This file is distributed in the hope that it will be useful, but
  11 # WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 # General Public License for more details.
  14 #
  15 # Under Section 7 of GPL version 3, you are granted additional
  16 # permissions described in the GCC Runtime Library Exception, version
  17 # 3.1, as published by the Free Software Foundation.
  18 #
  19 # You should have received a copy of the GNU General Public License and
  20 # a copy of the GCC Runtime Library Exception along with this program;
  21 # see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  22 # <http://www.gnu.org/licenses/>.
  23
  24 /* An executable stack is *not* required for these functions.  */
  25 #if defined(__ELF__) && defined(__linux__)
  26 .section .note.GNU-stack,"",%progbits
  27 .previous
  28 #endif
  29
  30 # This file creates a stack frame for the contents of the .fini and
  31 # .init sections.  Users may put any desired instructions in those
  32 # sections.
  33
  34 #ifdef __ELF__
  35 #define TYPE(x) .type x,function
  36 #else
  37 #define TYPE(x)
  38 #endif
  39
  40         # Note - this macro is complemented by the FUNC_END macro
  41         # in crtn.S.  If you change this macro you must also change
  42         # that macro match.
  43 .macro FUNC_START
  44         #  Create a stack frame and save any call-preserved registers
  45         stp     x29, x30, [sp, #-16]!
  46         stp     x27, x28, [sp, #-16]!
  47         stp     x25, x26, [sp, #-16]!
  48         stp     x23, x24, [sp, #-16]!
  49         stp     x21, x22, [sp, #-16]!
  50         stp     x19, x20, [sp, #-16]!
  51 .endm
  52
  53         .section        ".init"
  54         .align 2
  55         .global _init
  56         TYPE(_init)
  57 _init:
  58         FUNC_START
  59
  60
  61         .section        ".fini"
  62         .align  2
  63         .global _fini
  64         TYPE(_fini)
  65 _fini:
  66         FUNC_START
  67
  68 # end of crti.S