libgcc/config/arm/crti.S

   1 #   Copyright (C) 2001-2022 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 3, or (at your option) any
   7 # later version.
   8 #
   9 # This file is distributed in the hope that it will be useful, but
  10 # WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 # General Public License for more details.
  13 #
  14 # Under Section 7 of GPL version 3, you are granted additional
  15 # permissions described in the GCC Runtime Library Exception, version
  16 # 3.1, as published by the Free Software Foundation.
  17 #
  18 # You should have received a copy of the GNU General Public License and
  19 # a copy of the GCC Runtime Library Exception along with this program;
  20 # see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  21 # <http://www.gnu.org/licenses/>.
  22
  23 /* An executable stack is *not* required for these functions.  */
  24 #if defined(__ELF__) && defined(__linux__)
  25 .section .note.GNU-stack,"",%progbits
  26 .previous
  27 #endif
  28
  29 # This file just make a stack frame for the contents of the .fini and
  30 # .init sections.  Users may put any desired instructions in those
  31 # sections.
  32
  33 #ifdef __ELF__
  34 #define TYPE(x) .type x,function
  35 #else
  36 #define TYPE(x)
  37 #endif
  38 #ifdef __ARM_EABI__
  39 /* Some attributes that are common to all routines in this file.  */
  40         /* Tag_ABI_align_needed: This code does not require 8-byte
  41            alignment from the caller.  */
  42         /* .eabi_attribute 24, 0  -- default setting.  */
  43         /* Tag_ABI_align_preserved: This code preserves 8-byte
  44            alignment in any callee.  */
  45         .eabi_attribute 25, 1
  46 #endif /* __ARM_EABI__ */
  47
  48         # Note - this macro is complemented by the FUNC_END macro
  49         # in crtn.S.  If you change this macro you must also change
  50         # that macro match.
  51 .macro FUNC_START
  52 #ifdef __thumb__
  53         .thumb
  54
  55         push    {r3, r4, r5, r6, r7, lr}
  56 #else
  57         .arm
  58         #  Create a stack frame and save any call-preserved registers
  59         mov     ip, sp
  60         stmdb   sp!, {r3, r4, r5, r6, r7, r8, r9, sl, fp, ip, lr, pc}
  61         sub     fp, ip, #4
  62 #endif
  63 .endm
  64
  65         .section        ".init"
  66         .align 2
  67         .global _init
  68 #ifdef __thumb__
  69         .thumb_func
  70 #endif
  71         TYPE(_init)
  72 _init:
  73         FUNC_START
  74
  75
  76         .section        ".fini"
  77         .align  2
  78         .global _fini
  79 #ifdef __thumb__
  80         .thumb_func
  81 #endif
  82         TYPE(_fini)
  83 _fini:
  84         FUNC_START
  85
  86 # end of crti.S