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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /csu/initfini.c
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initial import
Diffstat (limited to 'csu/initfini.c')
-rw-r--r--csu/initfini.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/csu/initfini.c b/csu/initfini.c
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+/* Special .init and .fini section support.
+Copyright (C) 1995 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 Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+/* This file is compiled into assembly code which is then surrounded by the
+ lines `cat > crtcommon.tmp <<\EOF_common' and `EOF_common' and thus
+ becomes a shell script which creates three files of assembly code.
+
+ * The first file is crti.s-new; this 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 second file is crtn.s-new; this puts the corresponding function
+ epilogues in the .init and .fini sections.
+
+ * The third file is crtcommon.tmp, which is whatever miscellaneous cruft
+ the compiler generated at the end; it should be appended to both crti.s-new
+ and crtn.s-new. */
+
+#include <stdlib.h>
+
+/* These declarations make the functions go in the right sections when
+ we define them below. GCC syntax does not allow the attribute
+ specifications to be in the function definitions themselves. */
+void _init (void) __attribute__ ((section (".init")));
+void _fini (void) __attribute__ ((section (".fini")));
+
+/* End the here document containing the initial common code.
+ Then move the output file crtcommon.tmp to crti.s-new and crtn.s-new. */
+asm ("\nEOF_common\n\
+mv -f crtcommon.tmp crti.s-new\n\
+cp -f crti.s-new crtn.s-new");
+
+/* Append the .init prologue to crti.s-new. */
+asm ("cat >> crti.s-new <<\\EOF.crti.init");
+void
+_init (void)
+{
+ /* End the here document containing the .init prologue code.
+ Then fetch the .section directive just written and append that
+ to crtn.s-new, followed by the function epilogue. */
+ asm ("\nEOF.crti.init
+\n\
+ fgrep .init crti.s-new >>crtn.s-new\n\
+ cat >> crtn.s-new <<\\EOF.crtn.init");
+}
+
+/* End the here document containing the .init epilogue code.
+ Then append the .fini prologue to crti.s-new. */
+asm ("\nEOF.crtn.init\
+\n\
+cat >> crti.s-new <<\\EOF.crti.fini");
+
+void
+_fini (void)
+{
+ /* End the here document containing the .fini prologue code.
+ Then fetch the .section directive just written and append that
+ to crtn.s-new, followed by the function epilogue. */
+ asm ("\nEOF.crti.fini\
+\n\
+ fgrep .fini crti.s-new >>crtn.s-new\n\
+ cat >> crtn.s-new <<\\EOF.crtn.fini");
+}
+
+/* End the here document containing the .fini epilogue code.
+ Finally, put the remainder of the generated assembly into crtcommon.tmp. */
+asm ("\nEOF.crtn.fini\
+\n\
+cat > crtcommon.tmp <<\\EOF_common");