sysdeps/tile/crti.S

   1 /* Special .init and .fini section support for tile.
   2    Copyright (C) 2012-2016 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    In addition to the permissions in the GNU Lesser General Public
  11    License, the Free Software Foundation gives you unlimited
  12    permission to link the compiled version of this file with other
  13    programs, and to distribute those programs without any restriction
  14    coming from the use of this file. (The GNU Lesser General Public
  15    License restrictions do apply in other respects; for example, they
  16    cover modification of the file, and distribution when not linked
  17    into another program.)
  18
  19    Note that people who make modified versions of this file are not
  20    obligated to grant this special exception for their modified
  21    versions; it is their choice whether to do so. The GNU Lesser
  22    General Public License gives permission to release a modified
  23    version without this exception; this exception also makes it
  24    possible to release a modified version which carries forward this
  25    exception.
  26
  27    The GNU C Library is distributed in the hope that it will be useful,
  28    but WITHOUT ANY WARRANTY; without even the implied warranty of
  29    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  30    Lesser General Public License for more details.
  31
  32    You should have received a copy of the GNU Lesser General Public
  33    License along with the GNU C Library; if not, see
  34    <http://www.gnu.org/licenses/>.  */
  35
  36 /* crti.S puts a function prologue at the beginning of the .init and
  37    .fini sections and defines global symbols for those addresses, so
  38    they can be called as functions.  The symbols _init and _fini are
  39    magic and cause the linker to emit DT_INIT and DT_FINI.  */
  40
  41 #include <libc-symbols.h>
  42 #include <sysdep.h>
  43
  44 #ifndef PREINIT_FUNCTION
  45 # define PREINIT_FUNCTION __gmon_start__
  46 #endif
  47
  48 #ifndef PREINIT_FUNCTION_WEAK
  49 # define PREINIT_FUNCTION_WEAK 1
  50 #endif
  51
  52 #if PREINIT_FUNCTION_WEAK
  53         weak_extern (PREINIT_FUNCTION)
  54 #else
  55         .hidden PREINIT_FUNCTION
  56 #endif
  57
  58         .section .init,"ax",@progbits
  59         .align 8
  60         .globl _init
  61         .type _init, @function
  62 _init:
  63         {
  64          move r29, sp
  65          ADDI_PTR r28, sp, -REGSIZE
  66          ST sp, lr
  67         }
  68         ADDI_PTR sp, sp, -(2 * REGSIZE)
  69         ST r28, r29
  70 #if PREINIT_FUNCTION_WEAK
  71         lnk r2
  72 0:
  73 # ifdef __tilegx__
  74         moveli r1, hw2_last(_GLOBAL_OFFSET_TABLE_ - 0b)
  75         {
  76          shl16insli r1, r1, hw1(_GLOBAL_OFFSET_TABLE_ - 0b)
  77          moveli r0, hw1_last_got(PREINIT_FUNCTION)
  78         }
  79         {
  80          shl16insli r1, r1, hw0(_GLOBAL_OFFSET_TABLE_ - 0b)
  81          shl16insli r0, r0, hw0_got(PREINIT_FUNCTION)
  82         }
  83 # else
  84         {
  85          moveli r1, lo16(_GLOBAL_OFFSET_TABLE_ - 0b)
  86          moveli r0, got_lo16(PREINIT_FUNCTION)
  87         }
  88         {
  89          auli r1, r1, ha16(_GLOBAL_OFFSET_TABLE_ - 0b)
  90          auli r0, r0, got_ha16(PREINIT_FUNCTION)
  91         }
  92 # endif
  93         ADD_PTR r0, r0, r1
  94         ADD_PTR r0, r0, r2
  95         LD_PTR r0, r0
  96         BEQZ r0, .Lno_weak_fn
  97         jalr r0
  98 #elif defined(__tilegx__) && !defined(NO_PLT_PCREL)
  99         /* Since we are calling from the start of the object to the PLT,
 100            call by loading the full address into a register.  */
 101         lnk r2
 102 0:
 103         moveli r0, hw2_last_plt(PREINIT_FUNCTION - 0b)
 104         shl16insli r0, r0, hw1_plt(PREINIT_FUNCTION - 0b)
 105         shl16insli r0, r0, hw0_plt(PREINIT_FUNCTION - 0b)
 106         add r0, r0, r2
 107         jalr r0
 108 #else
 109         jal plt(PREINIT_FUNCTION)
 110 #endif
 111 .Lno_weak_fn:
 112
 113         .section .fini,"ax",@progbits
 114         .align 8
 115         .globl _fini
 116         .type _fini, @function
 117 _fini:
 118         {
 119          move r29, sp
 120          ADDI_PTR r28, sp, -REGSIZE
 121          ST sp, lr
 122         }
 123         ADDI_PTR sp, sp, -(2 * REGSIZE)
 124         ST r28, r29