Initialization code for libpthread on Alpha.

sysdeps/alpha/nptl/elf/pt-initfini.c

@@ -0,0 +1,93 @@
+/* Special .init and .fini section support for Alpha.  NPTL version.
+   Copyright (C) 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.
+
+   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.
+
+   This differs from what would be generated by the generic code in that
+   we save and restore the GP within the function.  In order for linker
+   relaxation to work, the value in the GP register on exit from a function
+   must be valid for the function entry point.  Normally, a function is
+   contained within one object file and this is not an issue, provided
+   that the function reloads the gp after making any function calls.
+   However, _init and _fini are constructed from pieces of many object
+   files, all of which may have different GP values.  So we must reload
+   the GP value from crti.o in crtn.o.  */
+
+__asm__ ("						\n\
+#include \"defs.h\"					\n\
+							\n\
+/*@HEADER_ENDS*/					\n\
+							\n\
+/*@_init_PROLOG_BEGINS*/				\n\
+	.section .init, \"ax\", @progbits		\n\
+	.globl	_init					\n\
+	.ent	_init					\n\
+_init:							\n\
+	ldgp	$29, 0($27)				\n\
+	subq	$30, 16, $30				\n\
+	stq	$26, 0($30)				\n\
+	stq	$29, 8($30)				\n\
+	.prologue 1					\n\
+	bsr	$26, __pthread_initialize_minimal_internal !samegp \n\
+	.align 3					\n\
+	.end	_init					\n\
+	.size	_init, 0				\n\
+/*@_init_PROLOG_ENDS*/					\n\
+							\n\
+/*@_init_EPILOG_BEGINS*/				\n\
+	.section .init, \"ax\", @progbits		\n\
+	ldq	$26, 0($30)				\n\
+	ldq	$29, 8($30)				\n\
+	addq	$30, 16, $30				\n\
+	ret						\n\
+/*@_init_EPILOG_ENDS*/					\n\
+							\n\
+/*@_fini_PROLOG_BEGINS*/				\n\
+	.section .fini, \"ax\", @progbits		\n\
+	.globl	_fini					\n\
+	.ent	_fini					\n\
+_fini:							\n\
+	ldgp	$29, 0($27)				\n\
+	subq	$30, 16, $30				\n\
+	stq	$26, 0($30)				\n\
+	stq	$29, 8($30)				\n\
+	.prologue 1					\n\
+	.align 3					\n\
+	.end	_fini					\n\
+	.size	_fini, 0				\n\
+/*@_fini_PROLOG_ENDS*/					\n\
+							\n\
+/*@_fini_EPILOG_BEGINS*/				\n\
+	.section .fini, \"ax\", @progbits		\n\
+	ldq	$26, 0($30)				\n\
+	ldq	$29, 8($30)				\n\
+	addq	$30, 16, $30				\n\
+	ret						\n\
+/*@_fini_EPILOG_ENDS*/					\n\
+							\n\
+/*@TRAILER_BEGINS*/					\n\
+");