| 1 | /* Special .init and .fini section support for Nios II. |
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| 2 | Copyright (C) 2012-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | In addition to the permissions in the GNU Lesser General Public |
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| 11 | License, the Free Software Foundation gives you unlimited |
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| 12 | permission to link the compiled version of this file with other |
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| 13 | programs, and to distribute those programs without any restriction |
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| 14 | coming from the use of this file. (The GNU Lesser General Public |
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| 15 | License restrictions do apply in other respects; for example, they |
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| 16 | cover modification of the file, and distribution when not linked |
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| 17 | into another program.) |
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| 18 | |
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| 19 | Note that people who make modified versions of this file are not |
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| 20 | obligated to grant this special exception for their modified |
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| 21 | versions; it is their choice whether to do so. The GNU Lesser |
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| 22 | General Public License gives permission to release a modified |
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| 23 | version without this exception; this exception also makes it |
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| 24 | possible to release a modified version which carries forward this |
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| 25 | exception. |
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| 26 | |
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| 27 | The GNU C Library is distributed in the hope that it will be useful, |
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| 28 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 29 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 30 | Lesser General Public License for more details. |
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| 31 | |
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| 32 | You should have received a copy of the GNU Lesser General Public |
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| 33 | License along with the GNU C Library. If not, see |
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| 34 | <https://www.gnu.org/licenses/>. */ |
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| 35 | |
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| 36 | /* crti.S puts a function prologue at the beginning of the .init and |
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| 37 | .fini sections and defines global symbols for those addresses, so |
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| 38 | they can be called as functions. The symbols _init and _fini are |
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| 39 | magic and cause the linker to emit DT_INIT and DT_FINI. */ |
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| 40 | |
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| 41 | #include <libc-symbols.h> |
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| 42 | |
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| 43 | #ifndef PREINIT_FUNCTION |
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| 44 | # define PREINIT_FUNCTION __gmon_start__ |
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| 45 | #endif |
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| 46 | |
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| 47 | #ifndef PREINIT_FUNCTION_WEAK |
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| 48 | # define PREINIT_FUNCTION_WEAK 1 |
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| 49 | #endif |
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| 50 | |
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| 51 | #if PREINIT_FUNCTION_WEAK |
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| 52 | weak_extern (PREINIT_FUNCTION) |
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| 53 | #else |
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| 54 | .hidden PREINIT_FUNCTION |
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| 55 | #endif |
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| 56 | |
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| 57 | .section .init,"ax" ,@progbits |
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| 58 | .align 2 |
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| 59 | .global _init |
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| 60 | .hidden _init |
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| 61 | .type _init, @function |
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| 62 | _init: |
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| 63 | addi sp, sp, -8 |
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| 64 | stw r22, 0(sp) |
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| 65 | nextpc r22 |
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| 66 | 1: |
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| 67 | movhi r8, %hiadj(_gp_got - 1b) |
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| 68 | addi r8, r8, %lo(_gp_got - 1b) |
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| 69 | add r22, r22, r8 |
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| 70 | stw ra, 4(sp) |
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| 71 | #if PREINIT_FUNCTION_WEAK |
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| 72 | movhi r2, %got_hiadj(PREINIT_FUNCTION) |
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| 73 | addi r2, r2, %got_lo(PREINIT_FUNCTION) |
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| 74 | add r2, r2, r22 |
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| 75 | ldw r2, 0(r2) |
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| 76 | beq r2, zero, .L5 |
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| 77 | #endif |
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| 78 | movhi r2, %call_hiadj(PREINIT_FUNCTION) |
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| 79 | addi r2, r2, %call_lo(PREINIT_FUNCTION) |
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| 80 | add r2, r2, r22 |
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| 81 | ldw r2, 0(r2) |
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| 82 | callr r2 |
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| 83 | .L5: |
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| 84 | |
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| 85 | .section .fini,"ax" ,@progbits |
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| 86 | .align 2 |
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| 87 | .global _fini |
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| 88 | .hidden _fini |
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| 89 | .type _fini, @function |
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| 90 | _fini: |
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| 91 | addi sp, sp, -8 |
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| 92 | stw r22, 0(sp) |
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| 93 | nextpc r22 |
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| 94 | 1: |
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| 95 | movhi r8, %hiadj(_gp_got - 1b) |
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| 96 | addi r8, r8, %lo(_gp_got - 1b) |
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| 97 | stw ra, 4(sp) |
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| 98 | add r22, r22, r8 |
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| 99 | |
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