102 lines
3.4 KiB
ArmAsm
102 lines
3.4 KiB
ArmAsm
/* Special .init and .fini section support for Alpha.
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Copyright (C) 2001-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU Lesser General Public
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License, the Free Software Foundation gives you unlimited
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permission to link the compiled version of this file with other
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programs, and to distribute those programs without any restriction
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coming from the use of this file. (The GNU Lesser General Public
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License restrictions do apply in other respects; for example, they
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cover modification of the file, and distribution when not linked
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into another program.)
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Note that people who make modified versions of this file are not
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obligated to grant this special exception for their modified
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versions; it is their choice whether to do so. The GNU Lesser
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General Public License gives permission to release a modified
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version without this exception; this exception also makes it
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possible to release a modified version which carries forward this
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exception.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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/* crti.S puts a function prologue at the beginning of the .init and
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.fini sections and defines global symbols for those addresses, so
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they can be called as functions. The symbols _init and _fini are
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magic and cause the linker to emit DT_INIT and DT_FINI.
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This differs from what would be generated for ordinary code in that
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we save and restore the GP within the function. In order for linker
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relaxation to work, the value in the GP register on exit from a function
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must be valid for the function entry point. Normally, a function is
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contained within one object file and this is not an issue, provided
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that the function reloads the gp after making any function calls.
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However, _init and _fini are constructed from pieces of many object
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files, all of which may have different GP values. So we must reload
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the GP value from crti.o in crtn.o. */
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#include <libc-symbols.h>
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#include <sysdep.h>
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#ifndef PREINIT_FUNCTION
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# define PREINIT_FUNCTION __gmon_start__
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#endif
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#ifndef PREINIT_FUNCTION_WEAK
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# define PREINIT_FUNCTION_WEAK 1
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#endif
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#if PREINIT_FUNCTION_WEAK
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weak_extern (PREINIT_FUNCTION)
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#else
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.hidden PREINIT_FUNCTION
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#endif
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.section .init, "ax", @progbits
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.globl _init
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.hidden _init
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.type _init, @function
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.usepv _init, std
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_init:
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ldgp $29, 0($27)
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subq $30, 16, $30
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#if PREINIT_FUNCTION_WEAK
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lda $27, PREINIT_FUNCTION
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#endif
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stq $26, 0($30)
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stq $29, 8($30)
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#if PREINIT_FUNCTION_WEAK
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beq $27, 1f
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jsr $26, ($27), PREINIT_FUNCTION
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ldq $29, 8($30)
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1:
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#else
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bsr $26, PREINIT_FUNCTION !samegp
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#endif
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.p2align 3
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.section .fini, "ax", @progbits
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.globl _fini
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.hidden _fini
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.type _fini,@function
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.usepv _fini,std
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_fini:
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ldgp $29, 0($27)
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subq $30, 16, $30
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stq $26, 0($30)
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stq $29, 8($30)
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.p2align 3
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