libgcc/config/nios2/crti.S

   1 /* Copyright (C) 2012-2020 Free Software Foundation, Inc.
   2    Contributed by Jonah Graham (jgraham@altera.com).
   3    Contributed by Mentor Graphics, Inc.
   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 make 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    While technically any code can be put in the init and fini sections
  30    most stuff will not work other than stuff which obeys the call frame
  31    and ABI.  All the call-preserved registers are saved, the call clobbered
  32    registers should have been saved by the code calling init and fini.
  33
  34    See crtstuff.c for an example of code that inserts itself in the init
  35    and fini sections.
  36
  37    See crt0.s for the code that calls init and fini.  */
  38
  39         .section        ".init"
  40         .align 2
  41         .global _init
  42 _init:
  43         addi    sp, sp, -48
  44         stw     ra, 44(sp)
  45         stw     r23, 40(sp)
  46         stw     r22, 36(sp)
  47         stw     r21, 32(sp)
  48         stw     r20, 28(sp)
  49         stw     r19, 24(sp)
  50         stw     r18, 20(sp)
  51         stw     r17, 16(sp)
  52         stw     r16, 12(sp)
  53         stw     fp, 8(sp)
  54         addi    fp, sp, 8
  55 #ifdef linux
  56         nextpc  r22
  57 1:      movhi   r2, %hiadj(_gp_got - 1b)
  58         addi    r2, r2, %lo(_gp_got - 1b)
  59         add     r22, r22, r2
  60 #endif
  61
  62
  63         .section        ".fini"
  64         .align  2
  65         .global _fini
  66 _fini:
  67         addi    sp, sp, -48
  68         stw     ra, 44(sp)
  69         stw     r23, 40(sp)
  70         stw     r22, 36(sp)
  71         stw     r21, 32(sp)
  72         stw     r20, 28(sp)
  73         stw     r19, 24(sp)
  74         stw     r18, 20(sp)
  75         stw     r17, 16(sp)
  76         stw     r16, 12(sp)
  77         stw     fp, 8(sp)
  78         addi    fp, sp, 8
  79 #ifdef linux
  80         nextpc  r22
  81 1:      movhi   r2, %hiadj(_gp_got - 1b)
  82         addi    r2, r2, %lo(_gp_got - 1b)
  83         add     r22, r22, r2
  84 #endif
  85