libgcc/config/ia64/crtend.S

/* Copyright (C) 2000-2023 Free Software Foundation, Inc.
   Contributed by Jes Sorensen, <Jes.Sorensen@cern.ch>

   This file is part of GCC.

   GCC is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   GCC 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 General Public License for more details.

   Under Section 7 of GPL version 3, you are granted additional
   permissions described in the GCC Runtime Library Exception, version
   3.1, as published by the Free Software Foundation.

   You should have received a copy of the GNU General Public License and
   a copy of the GCC Runtime Library Exception along with this program;
   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
   <http://www.gnu.org/licenses/>.  */

#include "auto-host.h"

.section .ctors,"aw","progbits"
	.align	8
__CTOR_END__:
	data8	0

.section .dtors,"aw","progbits"
	.align 8
__DTOR_END__:
	data8	0

#if HAVE_INITFINI_ARRAY_SUPPORT
	.global __do_global_ctors_aux
	.hidden	__do_global_ctors_aux
#else /* !HAVE_INITFINI_ARRAY_SUPPORT */
/*
 * Fragment of the ELF _init routine that invokes our dtor cleanup.
 *
 * We make the call by indirection, because in large programs the 
 * .fini and .init sections are not in range of the destination, and
 * we cannot allow the linker to insert a stub at the end of this
 * fragment of the _fini function.  Further, Itanium does not implement
 * the long branch instructions, and we do not wish every program to
 * trap to the kernel for emulation.
 *
 * Note that we require __do_global_ctors_aux to preserve the GP,
 * so that the next fragment in .fini gets the right value.
 */
.section .init,"ax","progbits"
	{ .mlx
	  movl r2 = @pcrel(__do_global_ctors_aux - 16)
	}
	{ .mii
	  mov r3 = ip
	  ;;
	  add r2 = r2, r3
	  ;;
	}
	{ .mib
	  mov b6 = r2
	  br.call.sptk.many b0 = b6
	  ;;
	}
#endif /* !HAVE_INITFINI_ARRAY_SUPPORT */

.text
	.align 32
	.proc __do_global_ctors_aux
__do_global_ctors_aux:
	.prologue
	/*
		for (loc0 = __CTOR_END__-1; *p != -1; --p)
		  (*p) ();
	*/
	.save ar.pfs, r34
	alloc loc2 = ar.pfs, 0, 5, 0, 0
	movl loc0 = @gprel(__CTOR_END__ - 8)
	;;

	add loc0 = loc0, gp
	;;
	ld8 loc3 = [loc0], -8
	.save rp, loc1
	mov loc1 = rp
	.body
	;;

	cmp.eq p6, p0 = -1, loc3
	mov loc4 = gp
(p6)	br.cond.spnt.few .exit

.loop:	ld8 r15 = [loc3], 8
	;;
	ld8 gp = [loc3]
	mov b6 = r15

	ld8 loc3 = [loc0], -8
	nop 0
	br.call.sptk.many rp = b6
	;;

	cmp.ne p6, p0 = -1, loc3
	nop 0
(p6)	br.cond.sptk.few .loop

.exit:	mov gp = loc3
	mov rp = loc1
	mov ar.pfs = loc2

	br.ret.sptk.many rp
	.endp __do_global_ctors_aux