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/* Special .init and .fini section support for IA64.
Copyright (C) 2000-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
In addition to the permissions in the GNU Lesser General Public
License, the Free Software Foundation gives you unlimited
permission to link the compiled version of this file with other
programs, and to distribute those programs without any restriction
coming from the use of this file. (The GNU Lesser General Public
License restrictions do apply in other respects; for example, they
cover modification of the file, and distribution when not linked
into another program.)
Note that people who make modified versions of this file are not
obligated to grant this special exception for their modified
versions; it is their choice whether to do so. The GNU Lesser
General Public License gives permission to release a modified
version without this exception; this exception also makes it
possible to release a modified version which carries forward this
exception.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
/* crti.S puts a function prologue at the beginning of the .init and
.fini sections and defines global symbols for those addresses, so
they can be called as functions. The symbols _init and _fini are
magic and cause the linker to emit DT_INIT and DT_FINI. */
#include <libc-symbols.h>
#include <sysdep.h>
#undef ret
#ifndef PREINIT_FUNCTION
# define PREINIT_FUNCTION __gmon_start__
#endif
#ifndef PREINIT_FUNCTION_WEAK
# define PREINIT_FUNCTION_WEAK 1
#endif
#if PREINIT_FUNCTION_WEAK
weak_extern (PREINIT_FUNCTION)
#else
.hidden PREINIT_FUNCTION
#endif
/* If we have working .init_array support, we want to keep the .init
section empty (apart from the mandatory prologue/epilogue. This
ensures that the default unwind conventions (return-pointer in b0,
frame state in ar.pfs, etc.) will do the Right Thing. To ensure
an empty .init section, we register gmon_initializer() via the
.init_array.
--davidm 02/10/29 */
#if PREINIT_FUNCTION_WEAK
/* This blob of assembly code is one simple C function:
static void
__attribute__ ((used))
gmon_initializer (void)
{
extern void weak_function __gmon_start__ (void);
if (__gmon_start__)
(*__gmon_start__)();
}
*/
.text
.align 64
.proc gmon_initializer#
gmon_initializer:
.prologue 12, 32
.mmi
.save ar.pfs, r33
alloc r33 = ar.pfs, 0, 3, 0, 0
addl r14 = @ltoff(@fptr(PREINIT_FUNCTION#)), gp
.save rp, r32
mov r32 = b0
.mmi
mov r34 = r1
.body
;;
ld8 r14 = [r14]
nop 0
;;
.mib
cmp.eq p6, p7 = 0, r14
nop 0
(p6) br.cond.spnt .L1
;;
.mib
nop 0
nop 0
br.call.sptk.many b0 = PREINIT_FUNCTION#
;;
.mmi
mov r1 = r34
nop 0
nop 0
.L1:
.mii
nop 0
mov ar.pfs = r33
nop 0
;;
.mib
nop 0
mov b0 = r32
br.ret.sptk.many b0
.endp gmon_initializer#
# undef PREINIT_FUNCTION
# define PREINIT_FUNCTION gmon_initializer
#endif
.section .init_array, "aw"
data8 @fptr(PREINIT_FUNCTION)
.section .init,"ax",@progbits
.global _init#
.proc _init#
_init:
.prologue
.save ar.pfs, r34
alloc r34 = ar.pfs, 0, 3, 0, 0
.vframe r32
mov r32 = r12
.save rp, r33
mov r33 = b0
.body
adds r12 = -16, r12
;; /* see gmon_initializer() above */
.endp _init#
.section .fini,"ax",@progbits
.global _fini#
.proc _fini#
_fini:
.prologue
.save ar.pfs, r34
alloc r34 = ar.pfs, 0, 3, 0, 0
.vframe r32
mov r32 = r12
.save rp, r33
mov r33 = b0
.body
adds r12 = -16, r12
;;
.endp _fini#
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