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1 # Define _init and _fini entry points for C-SKY.
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2 # Copyright (C) 2018-2020 Free Software Foundation, Inc.
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3 # Contributed by C-SKY Microsystems and Mentor Graphics.
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4 #
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5 # This file is free software; you can redistribute it and/or modify it
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6 # under the terms of the GNU General Public License as published by the
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7 # Free Software Foundation; either version 3, or (at your option) any
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8 # later version.
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9 #
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10 # This file is distributed in the hope that it will be useful, but
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11 # WITHOUT ANY WARRANTY; without even the implied warranty of
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12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 # General Public License for more details.
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14 #
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15 # Under Section 7 of GPL version 3, you are granted additional
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16 # permissions described in the GCC Runtime Library Exception, version
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17 # 3.1, as published by the Free Software Foundation.
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18 #
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19 # You should have received a copy of the GNU General Public License and
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20 # a copy of the GCC Runtime Library Exception along with this program;
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21 # see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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22 # <http://www.gnu.org/licenses/>.
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23
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24
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25 # This file just makes a stack frame for the contents of the .fini and
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26 # .init sections. Users may put any desired instructions in those
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27 # sections.
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28
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29 .file "crti.S"
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30
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31 /* We use more complicated versions of this code with GLIBC. */
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32 #if defined(__gnu_linux__)
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33
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34 #ifndef PREINIT_FUNCTION
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35 # define PREINIT_FUNCTION __gmon_start__
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36 #endif
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37
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38 #ifndef PREINIT_FUNCTION_WEAK
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39 # define PREINIT_FUNCTION_WEAK 1
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40 #endif
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41
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42 #if PREINIT_FUNCTION_WEAK
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43 .global PREINIT_FUNCTION
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44 .weak PREINIT_FUNCTION
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45 .align 4
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46 .type call_weak_fn, %function
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47 call_weak_fn:
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48 // push lr
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49 subi sp, 4
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50 stw lr, (sp)
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51 #ifdef __PIC__
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52 lrw a2, PREINIT_FUNCTION@GOT
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53 addu a2, gb
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54 ldw a2, (a2)
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55 #else
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56 lrw a2, PREINIT_FUNCTION
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57 #endif
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58 cmpnei a2, 0
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59 bf 1f
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60 jsr a2
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61 1:
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62 // pop lr
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63 ldw lr, (sp)
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64 addi sp, 4
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65 rts
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66
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67 .align 4
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68 #else
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69 .hidden PREINIT_FUNCTION
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70 #endif /* PREINIT_FUNCTION_WEAK */
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71
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72 .section .init,"ax",@progbits
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73 .align 4
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74 .globl _init
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75 .type _init, @function
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76 _init:
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77 subi sp, 8
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78 stw lr, (sp, 0)
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79 #ifdef __PIC__
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80 // stw gb, (sp, 4)
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81 bsr .Lgetpc
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82 .Lgetpc:
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83 lrw gb, .Lgetpc@GOTPC
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84 add gb, lr
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85 #endif
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86 #if PREINIT_FUNCTION_WEAK
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87 #ifdef __PIC__
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88 lrw a2, call_weak_fn@GOTOFF
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89 add a2, gb
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90 jsr a2
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91 #else
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92 jsri call_weak_fn
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93 #endif
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94 #else /* !PREINIT_FUNCTION_WEAK */
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95 #ifdef __PIC__
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96 lrw a2, PREINIT_FUNCTION@PLT
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97 addu a2, gb
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98 ldw a2, (a2)
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99 jsr a2
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100 #else
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101 jsri PREINIT_FUNCTION
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102 #endif
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103 #endif /* PREINIT_FUNCTION_WEAK */
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104
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105 br 2f
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106 .literals
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107 .align 4
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108 2:
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109 .section .fini,"ax",@progbits
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110 .align 4
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111 .globl _fini
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112 .type _fini, @function
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113 _fini:
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114 subi sp,8
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115 stw lr, (sp, 0)
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116 br 2f
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117 .literals
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118 .align 4
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119 2:
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120
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121 /* These are the non-GLIBC versions. */
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122 #else /* !defined(__gnu_linux__) */
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123 .section ".init"
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124 .global _init
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125 .type _init,@function
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126 .align 2
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127 _init:
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128 subi sp, 16
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129 st.w lr, (sp, 12)
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130 mov r0, r0
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131
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132 .section ".fini"
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133 .global _fini
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134 .type _fini,@function
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135 .align 2
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136 _fini:
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137 subi sp, 16
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138 st.w lr, (sp, 12)
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139 mov r0, r0
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140 #endif /* defined(__gnu_linux__) */
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