| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Special .init and .fini section support for IA64. |
| 2 | Copyright (C) 2000-2015 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 | #undef ret |
| 44 | |
| 45 | #ifndef PREINIT_FUNCTION |
| 46 | # define PREINIT_FUNCTION __gmon_start__ |
| 47 | #endif |
| 48 | |
| 49 | #ifndef PREINIT_FUNCTION_WEAK |
| 50 | # define PREINIT_FUNCTION_WEAK 1 |
| 51 | #endif |
| 52 | |
| 53 | #if PREINIT_FUNCTION_WEAK |
| 54 | weak_extern (PREINIT_FUNCTION) |
| 55 | #else |
| 56 | .hidden PREINIT_FUNCTION |
| 57 | #endif |
| 58 | |
| 59 | /* If we have working .init_array support, we want to keep the .init |
| 60 | section empty (apart from the mandatory prologue/epilogue. This |
| 61 | ensures that the default unwind conventions (return-pointer in b0, |
| 62 | frame state in ar.pfs, etc.) will do the Right Thing. To ensure |
| 63 | an empty .init section, we register gmon_initializer() via the |
| 64 | .init_array. |
| 65 | |
| 66 | --davidm 02/10/29 */ |
| 67 | |
| 68 | #if PREINIT_FUNCTION_WEAK |
| 69 | /* This blob of assembly code is one simple C function: |
| 70 | |
| 71 | static void |
| 72 | __attribute__ ((used)) |
| 73 | gmon_initializer (void) |
| 74 | { |
| 75 | extern void weak_function __gmon_start__ (void); |
| 76 | |
| 77 | if (__gmon_start__) |
| 78 | (*__gmon_start__)(); |
| 79 | } |
| 80 | */ |
| 81 | .text |
| 82 | .align 64 |
| 83 | .proc gmon_initializer# |
| 84 | gmon_initializer: |
| 85 | .prologue 12, 32 |
| 86 | .mmi |
| 87 | .save ar.pfs, r33 |
| 88 | alloc r33 = ar.pfs, 0, 3, 0, 0 |
| 89 | addl r14 = @ltoff(@fptr(PREINIT_FUNCTION#)), gp |
| 90 | .save rp, r32 |
| 91 | mov r32 = b0 |
| 92 | .mmi |
| 93 | mov r34 = r1 |
| 94 | .body |
| 95 | ;; |
| 96 | ld8 r14 = [r14] |
| 97 | nop 0 |
| 98 | ;; |
| 99 | .mib |
| 100 | cmp.eq p6, p7 = 0, r14 |
| 101 | nop 0 |
| 102 | (p6) br.cond.spnt .L1 |
| 103 | ;; |
| 104 | .mib |
| 105 | nop 0 |
| 106 | nop 0 |
| 107 | br.call.sptk.many b0 = PREINIT_FUNCTION# |
| 108 | ;; |
| 109 | .mmi |
| 110 | mov r1 = r34 |
| 111 | nop 0 |
| 112 | nop 0 |
| 113 | .L1: |
| 114 | .mii |
| 115 | nop 0 |
| 116 | mov ar.pfs = r33 |
| 117 | nop 0 |
| 118 | ;; |
| 119 | .mib |
| 120 | nop 0 |
| 121 | mov b0 = r32 |
| 122 | br.ret.sptk.many b0 |
| 123 | .endp gmon_initializer# |
| 124 | # undef PREINIT_FUNCTION |
| 125 | # define PREINIT_FUNCTION gmon_initializer |
| 126 | #endif |
| 127 | .section .init_array, "aw" |
| 128 | data8 @fptr(PREINIT_FUNCTION) |
| 129 | |
| 130 | .section .init,"ax",@progbits |
| 131 | .global _init# |
| 132 | .proc _init# |
| 133 | _init: |
| 134 | .prologue |
| 135 | .save ar.pfs, r34 |
| 136 | alloc r34 = ar.pfs, 0, 3, 0, 0 |
| 137 | .vframe r32 |
| 138 | mov r32 = r12 |
| 139 | .save rp, r33 |
| 140 | mov r33 = b0 |
| 141 | .body |
| 142 | adds r12 = -16, r12 |
| 143 | ;; /* see gmon_initializer() above */ |
| 144 | .endp _init# |
| 145 | |
| 146 | .section .fini,"ax",@progbits |
| 147 | .global _fini# |
| 148 | .proc _fini# |
| 149 | _fini: |
| 150 | .prologue |
| 151 | .save ar.pfs, r34 |
| 152 | alloc r34 = ar.pfs, 0, 3, 0, 0 |
| 153 | .vframe r32 |
| 154 | mov r32 = r12 |
| 155 | .save rp, r33 |
| 156 | mov r33 = b0 |
| 157 | .body |
| 158 | adds r12 = -16, r12 |
| 159 | ;; |
| 160 | .endp _fini# |