1
/* Special .init and .fini section support for IA64.
2
Copyright (C) 2000-2012 Free Software Foundation, Inc.
3
This file is part of the GNU C Library.
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.
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.)
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
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.
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/>. */
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. */
41
#include <libc-symbols.h>
45
#ifndef PREINIT_FUNCTION
46
# define PREINIT_FUNCTION __gmon_start__
49
#ifndef PREINIT_FUNCTION_WEAK
50
# define PREINIT_FUNCTION_WEAK 1
53
#if PREINIT_FUNCTION_WEAK
54
weak_extern (PREINIT_FUNCTION)
56
.hidden PREINIT_FUNCTION
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
68
#if PREINIT_FUNCTION_WEAK
69
/* This blob of assembly code is one simple C function:
72
__attribute__ ((used))
73
gmon_initializer (void)
75
extern void weak_function __gmon_start__ (void);
83
.proc gmon_initializer#
88
alloc r33 = ar.pfs, 0, 3, 0, 0
89
addl r14 = @ltoff(@fptr(PREINIT_FUNCTION#)), gp
100
cmp.eq p6, p7 = 0, r14
102
(p6) br.cond.spnt .L1
107
br.call.sptk.many b0 = PREINIT_FUNCTION#
123
.endp gmon_initializer#
124
# undef PREINIT_FUNCTION
125
# define PREINIT_FUNCTION gmon_initializer
127
.section .init_array, "aw"
128
data8 @fptr(PREINIT_FUNCTION)
130
.section .init,"ax",@progbits
136
alloc r34 = ar.pfs, 0, 3, 0, 0
143
;; /* see gmon_initializer() above */
146
.section .fini,"ax",@progbits
152
alloc r34 = ar.pfs, 0, 3, 0, 0