glibc/sysdeps/ia64/elf/initfini.c

/* Special .init and .fini section support for ia64.
   Copyright (C) 2000, 2002 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.

   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
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"
"	.align 16\n"
"	.global _init#\n"
"	.proc _init#\n"
"_init:\n"
"	alloc r34 = ar.pfs, 0, 3, 0, 0\n"
"	mov r32 = r12\n"
"	mov r33 = b0\n"
"	adds r12 = -16, r12\n"
#ifdef HAVE_INITFINI_ARRAY
 "	;;\n"		/* see gmon_initializer() below */
#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
"	.align 16\n"
"	.endp _init#\n"
"\n"
"/*@_init_PROLOG_ENDS*/\n"
"\n"
"/*@_init_EPILOG_BEGINS*/\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"
"	.align 16\n"
"	.global _fini#\n"
"	.proc _fini#\n"
"_fini:\n"
"	alloc r34 = ar.pfs, 0, 3, 0, 0\n"
"	mov r32 = r12\n"
"	mov r33 = b0\n"
"	adds r12 = -16, r12\n"
"	;;\n"
"	.align 16\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"
"	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"
);