libgcc/config/csky/crti.S

   1 # Define _init and _fini entry points for C-SKY.
   2 # Copyright (C) 2018-2020 Free Software Foundation, Inc.
   3 # Contributed by C-SKY Microsystems and Mentor Graphics.
   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
  25 # This file just makes a stack frame for the contents of the .fini and
  26 # .init sections.  Users may put any desired instructions in those
  27 # sections.
  28
  29         .file    "crti.S"
  30
  31 /* We use more complicated versions of this code with GLIBC.  */
  32 #if defined(__gnu_linux__)
  33
  34 #ifndef PREINIT_FUNCTION
  35 # define PREINIT_FUNCTION __gmon_start__
  36 #endif
  37
  38 #ifndef PREINIT_FUNCTION_WEAK
  39 # define PREINIT_FUNCTION_WEAK 1
  40 #endif
  41
  42 #if PREINIT_FUNCTION_WEAK
  43         .global PREINIT_FUNCTION
  44         .weak PREINIT_FUNCTION
  45         .align 4
  46         .type call_weak_fn, %function
  47 call_weak_fn:
  48         // push  lr
  49         subi    sp, 4
  50         stw     lr, (sp)
  51 #ifdef  __PIC__
  52         lrw     a2, PREINIT_FUNCTION@GOT
  53         addu    a2, gb
  54         ldw     a2, (a2)
  55 #else
  56         lrw     a2, PREINIT_FUNCTION
  57 #endif
  58         cmpnei  a2, 0
  59         bf      1f
  60         jsr     a2
  61 1:
  62         // pop lr
  63         ldw     lr, (sp)
  64         addi    sp, 4
  65         rts
  66
  67         .align 4
  68 #else
  69         .hidden PREINIT_FUNCTION
  70 #endif /* PREINIT_FUNCTION_WEAK */
  71
  72         .section .init,"ax",@progbits
  73         .align 4
  74         .globl _init
  75         .type _init, @function
  76 _init:
  77         subi    sp, 8
  78         stw     lr, (sp, 0)
  79 #ifdef __PIC__
  80         //  stw     gb, (sp, 4)
  81         bsr     .Lgetpc
  82 .Lgetpc:
  83         lrw     gb, .Lgetpc@GOTPC
  84         add     gb, lr
  85 #endif
  86 #if PREINIT_FUNCTION_WEAK
  87 #ifdef __PIC__
  88         lrw     a2, call_weak_fn@GOTOFF
  89         add     a2, gb
  90         jsr     a2
  91 #else
  92         jsri    call_weak_fn
  93 #endif
  94 #else /* !PREINIT_FUNCTION_WEAK */
  95 #ifdef  __PIC__
  96         lrw     a2, PREINIT_FUNCTION@PLT
  97         addu    a2, gb
  98         ldw     a2, (a2)
  99         jsr     a2
 100 #else
 101         jsri    PREINIT_FUNCTION
 102 #endif
 103 #endif /* PREINIT_FUNCTION_WEAK */
 104
 105         br      2f
 106         .literals
 107         .align  4
 108 2:
 109         .section .fini,"ax",@progbits
 110         .align 4
 111         .globl _fini
 112         .type _fini, @function
 113 _fini:
 114         subi    sp,8
 115         stw     lr, (sp, 0)
 116         br      2f
 117         .literals
 118         .align  4
 119 2:
 120
 121 /* These are the non-GLIBC versions.  */
 122 #else  /* !defined(__gnu_linux__) */
 123         .section  ".init"
 124         .global  _init
 125         .type  _init,@function
 126         .align  2
 127 _init:
 128         subi  sp, 16
 129         st.w  lr, (sp, 12)
 130         mov     r0, r0
 131
 132         .section  ".fini"
 133         .global  _fini
 134         .type  _fini,@function
 135         .align  2
 136 _fini:
 137         subi  sp, 16
 138         st.w  lr, (sp, 12)
 139         mov     r0, r0
 140 #endif /* defined(__gnu_linux__) */