| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Special .init and .fini section support for Alpha. |
| 2 | Copyright (C) 2001-2016 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 | This differs from what would be generated for ordinary code in that |
| 42 | we save and restore the GP within the function. In order for linker |
| 43 | relaxation to work, the value in the GP register on exit from a function |
| 44 | must be valid for the function entry point. Normally, a function is |
| 45 | contained within one object file and this is not an issue, provided |
| 46 | that the function reloads the gp after making any function calls. |
| 47 | However, _init and _fini are constructed from pieces of many object |
| 48 | files, all of which may have different GP values. So we must reload |
| 49 | the GP value from crti.o in crtn.o. */ |
| 50 | |
| 51 | #include <libc-symbols.h> |
| 52 | #include <sysdep.h> |
| 53 | |
| 54 | #ifndef PREINIT_FUNCTION |
| 55 | # define PREINIT_FUNCTION __gmon_start__ |
| 56 | #endif |
| 57 | |
| 58 | #ifndef PREINIT_FUNCTION_WEAK |
| 59 | # define PREINIT_FUNCTION_WEAK 1 |
| 60 | #endif |
| 61 | |
| 62 | #if PREINIT_FUNCTION_WEAK |
| 63 | weak_extern (PREINIT_FUNCTION) |
| 64 | #else |
| 65 | .hidden PREINIT_FUNCTION |
| 66 | #endif |
| 67 | |
| 68 | .section .init, "ax", @progbits |
| 69 | .globl _init |
| 70 | .type _init, @function |
| 71 | .usepv _init, std |
| 72 | _init: |
| 73 | ldgp $29, 0($27) |
| 74 | subq $30, 16, $30 |
| 75 | #if PREINIT_FUNCTION_WEAK |
| 76 | lda $27, PREINIT_FUNCTION |
| 77 | #endif |
| 78 | stq $26, 0($30) |
| 79 | stq $29, 8($30) |
| 80 | #if PREINIT_FUNCTION_WEAK |
| 81 | beq $27, 1f |
| 82 | jsr $26, ($27), PREINIT_FUNCTION |
| 83 | ldq $29, 8($30) |
| 84 | 1: |
| 85 | #else |
| 86 | bsr $26, PREINIT_FUNCTION !samegp |
| 87 | #endif |
| 88 | .p2align 3 |
| 89 | |
| 90 | .section .fini, "ax", @progbits |
| 91 | .globl _fini |
| 92 | .type _fini,@function |
| 93 | .usepv _fini,std |
| 94 | _fini: |
| 95 | ldgp $29, 0($27) |
| 96 | subq $30, 16, $30 |
| 97 | stq $26, 0($30) |
| 98 | stq $29, 8($30) |
| 99 | .p2align 3 |