glibc/sysdeps/ia64/elf/initfini.c

/* Special .init and .fini section support for ia64.
   Copyright (C) 2000, 2002, 2003 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

/* This file is compiled into assembly code which is then munged by a sed
   script into two files: crti.s and crtn.s.

   * 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.

   * crtn.s puts the corresponding function epilogues
   in the .init and .fini sections. */

__asm__ ("\n\n"
"#include \"defs.h\"\n"
"\n"
"/*@HEADER_ENDS*/\n"
"\n"
"/*@_init_PROLOG_BEGINS*/\n");

#ifdef HAVE_INITFINI_ARRAY

/* 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 */

static void
__attribute__ ((used))
gmon_initializer (void)
{
  extern void weak_function __gmon_start__ (void);

  if (__gmon_start__)
    (*__gmon_start__)();
}

__asm__ (".section .init_array, \"aw\"\n"
	 "\tdata8 @fptr(gmon_initializer)\n");

#endif

__asm__ (".section .init\n"
"	.global _init#\n"
"	.proc _init#\n"
"_init:\n"
"	.prologue\n"
"	.save ar.pfs, r34\n"
"	alloc r34 = ar.pfs, 0, 3, 0, 0\n"
"	.vframe r32\n"
"	mov r32 = r12\n"
"	.save rp, r33\n"
"	mov r33 = b0\n"
"	.body\n"
"	adds r12 = -16, r12\n"
#ifdef HAVE_INITFINI_ARRAY
"	;;\n"		/* see gmon_initializer() above */
#else
"	.weak	__gmon_start__#\n"
"	addl r14 = @ltoff(@fptr(__gmon_start__#)), gp\n"
"	;;\n"
"	ld8 r15 = [r14]\n"
"	;;\n"
"	cmp.eq p6, p7 = 0, r15\n"
"	(p6) br.cond.dptk .L5\n"
"\n"
"/* we could use r35 to save gp, but we use the stack since that's what\n"
" * all the other init routines will do --davidm 00/04/05 */\n"
"	st8 [r12] = gp, -16\n"
"	br.call.sptk.many b0 = __gmon_start__# ;;\n"
"	adds r12 = 16, r12\n"
"	;;\n"
"	ld8 gp = [r12]\n"
"	;;\n"
".L5:\n"
#endif
"	.endp _init#\n"
"\n"
"/*@_init_PROLOG_ENDS*/\n"
"\n"
"/*@_init_EPILOG_BEGINS*/\n"
"	.proc _init#\n"
"	.prologue\n"
"	.save ar.pfs, r34\n"
"	.vframe r32\n"
"	.save rp, r33\n"
"	.body\n"
"	.section .init\n"
"	.regstk 0,2,0,0\n"
"	mov r12 = r32\n"
"	mov ar.pfs = r34\n"
"	mov b0 = r33\n"
"	br.ret.sptk.many b0\n"
"	.endp _init#\n"
"/*@_init_EPILOG_ENDS*/\n"
"\n"
"/*@_fini_PROLOG_BEGINS*/\n"
"	.section .fini\n"
"	.global _fini#\n"
"	.proc _fini#\n"
"_fini:\n"
"	.prologue\n"
"	.save ar.pfs, r34\n"
"	alloc r34 = ar.pfs, 0, 3, 0, 0\n"
"	.vframe r32\n"
"	mov r32 = r12\n"
"	.save rp, r33\n"
"	mov r33 = b0\n"
"	.body\n"
"	adds r12 = -16, r12\n"
"	;;\n"
"	.endp _fini#\n"
"\n"
"/*@_fini_PROLOG_ENDS*/\n"
"	br.call.sptk.many b0 = i_am_not_a_leaf# ;;\n"
"	;;\n"
"\n"
"/*@_fini_EPILOG_BEGINS*/\n"
"	.section .fini\n"
"	.proc _fini#\n"
"	.prologue\n"
"	.save ar.pfs, r34\n"
"	.vframe r32\n"
"	.save rp, r33\n"
"	.body\n"
"	mov r12 = r32\n"
"	mov ar.pfs = r34\n"
"	mov b0 = r33\n"
"	br.ret.sptk.many b0\n"
"	.endp _fini#\n"
"\n"
"/*@_fini_EPILOG_ENDS*/\n"
"\n"
"/*@TRAILER_BEGINS*/\n"
);