1/* Special .init and .fini section support for Alpha.
2   Copyright (C) 2001-2022 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   <https://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	.hidden	_init
71	.type	_init, @function
72	.usepv	_init, std
73_init:
74	ldgp	$29, 0($27)
75	subq	$30, 16, $30
76#if PREINIT_FUNCTION_WEAK
77	lda	$27, PREINIT_FUNCTION
78#endif
79	stq	$26, 0($30)
80	stq	$29, 8($30)
81#if PREINIT_FUNCTION_WEAK
82	beq	$27, 1f
83	jsr	$26, ($27), PREINIT_FUNCTION
84	ldq	$29, 8($30)
851:
86#else
87	bsr	$26, PREINIT_FUNCTION !samegp
88#endif
89	.p2align 3
90
91	.section .fini, "ax", @progbits
92	.globl	_fini
93	.hidden	_fini
94	.type	_fini,@function
95	.usepv	_fini,std
96_fini:
97	ldgp	$29, 0($27)
98	subq	$30, 16, $30
99	stq	$26, 0($30)
100	stq	$29, 8($30)
101	.p2align 3
102