/* 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.
+ Copyright (C) 1995, 1996, 1997 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.
+
+ In addition to the permissions in the GNU Library 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 Library 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.)
+
+ 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, 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
- * The second file is crtn.s-new; this puts the corresponding function
- epilogues in the .init and .fini sections.
+/* This file is compiled into assembly code which is then munged by a sed
+ script into two files: crti.s and crtn.s.
- * 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. */
+ * 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. */
#include <stdlib.h>
-/* We are compiled with -DGLOBAL=static to generate the versions used for
- shared libraries' .init and .fini sections, which do not have entry
- point symbols. */
-#ifndef GLOBAL
-#define GLOBAL
-#endif
-
-/* 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. */
-GLOBAL void _init (void) __attribute__ ((section (".init")));
-GLOBAL 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");
-GLOBAL void
+/* We use embedded asm for .section unconditionally, as this makes it
+ easier to insert the necessary directives into crtn.S. */
+#define SECTION(x) asm (".section \"" x "\"");
+
+/* Embed an #include to pull in the alignment and .end directives. */
+asm ("\n#include \"defs.h\"");
+
+/* The initial common code ends here. */
+asm ("\n/*@HEADER_ENDS*/");
+
+/* To determine whether we need .end and .align: */
+asm ("\n/*@TESTS_BEGIN*/");
+void
+dummy (void (*foo) (void))
+{
+ if (foo)
+ (*foo) ();
+}
+asm ("\n/*@TESTS_END*/");
+
+/* The beginning of _init: */
+asm ("\n/*@_init_PROLOG_BEGINS*/");
+
+SECTION (".init")
+void
_init (void)
{
- (void) &_init; /* Don't optimize out the function! */
- /* 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");
+ /* We cannot use the normal constructor mechanism in gcrt1.o because it
+ appears before crtbegin.o in the link, so the header elt of .ctors
+ would come after the elt for __gmon_start__. One approach is for
+ gcrt1.o to reference a symbol which would be defined by some library
+ module which has a constructor; but then user code's constructors
+ would come first, and not be profiled. */
+ extern void __gmon_start__ (void) __attribute__ ((weak)); /*weak_extern (__gmon_start__);*/
+
+ if (__gmon_start__)
+ __gmon_start__ ();
+
+ asm ("ALIGN");
+ asm("END_INIT");
+ /* Now the epilog. */
+ asm ("\n/*@_init_PROLOG_ENDS*/");
+ asm ("\n/*@_init_EPILOG_BEGINS*/");
+ SECTION(".init");
}
+asm ("END_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");
+/* End of the _init epilog, beginning of the _fini prolog. */
+asm ("\n/*@_init_EPILOG_ENDS*/");
+asm ("\n/*@_fini_PROLOG_BEGINS*/");
-GLOBAL void
+SECTION (".fini")
+void
_fini (void)
{
- (void) &_fini; /* Don't optimize out the function! */
- /* 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 of the _fini prolog. */
+ asm ("ALIGN");
+ asm ("END_FINI");
+ asm ("\n/*@_fini_PROLOG_ENDS*/");
+
+ {
+ /* Let GCC know that _fini is not a leaf function by having a dummy
+ function call here. We arrange for this call to be omitted from
+ either crt file. */
+ extern void i_am_not_a_leaf (void);
+ i_am_not_a_leaf ();
+ }
+
+ /* Beginning of the _fini epilog. */
+ asm ("\n/*@_fini_EPILOG_BEGINS*/");
+ SECTION (".fini");
}
+asm ("END_FINI");
+
+/* End of the _fini epilog. Any further generated assembly (e.g. .ident)
+ is shared between both crt files. */
+asm ("\n/*@_fini_EPILOG_ENDS*/");
+asm ("\n/*@TRAILER_BEGINS*/");
-/* 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");
+/* End of file. */
projects / kopensolaris-gnu / glibc.git / blobdiff