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authorMarek Polacek <polacek@redhat.com>2012-02-14 13:50:44 +0100
committerMarek Polacek <polacek@redhat.com>2012-02-14 13:50:44 +0100
commited656b4065ae8b948e67a865c0964f24e90c5133 (patch)
tree04c3e74a7f3c65fc825d3521a4dea4a31a38fded /sysdeps/x86_64/crti.S
parent2a979d3a148057b7220aa4a173258cfec69f0ad1 (diff)
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Provide crt[in].S for x86-64.
Diffstat (limited to 'sysdeps/x86_64/crti.S')
-rw-r--r--sysdeps/x86_64/crti.S80
1 files changed, 80 insertions, 0 deletions
diff --git a/sysdeps/x86_64/crti.S b/sysdeps/x86_64/crti.S
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+/* Special .init and .fini section support for x86-64.
+ Copyright (C) 2012 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>
+
+#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
+
+ .section .init,"ax",@progbits
+ .p2align 2
+ .globl _init
+ .type _init, @function
+_init:
+ /* Maintain 16-byte stack alignment for called functions. */
+ subq $8, %rsp
+#if PREINIT_FUNCTION_WEAK
+ movq PREINIT_FUNCTION@GOTPCREL(%rip), %rax
+ testq %rax, %rax
+ je .Lno_weak_fn
+ call PREINIT_FUNCTION@PLT
+.Lno_weak_fn:
+#else
+ call PREINIT_FUNCTION
+#endif
+
+ .section .fini,"ax",@progbits
+ .p2align 2
+ .globl _fini
+ .type _fini, @function
+_fini:
+ subq $8, %rsp