/* Special .init and .fini section support.
- Copyright (C) 1995, 1996 Free Software Foundation, Inc.
+ 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
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 Libraty General Public
+ 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.)
write to the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, 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.
+/* This file is compiled into assembly code which is then munged by a sed
+ script into two files: crti.s and crtn.s.
- * 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
+ * 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 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. */
+ * crtn.s puts the corresponding function epilogues
+ in the .init and .fini sections. */
#include <stdlib.h>
+/* 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 "\"");
-#ifdef HAVE_ELF
-/* 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")));
-
-#define SECTION(x) /* Put nothing extra before the defn. */
-
-#else
-/* Some non-ELF systems support .init and .fini sections,
- but the __attribute__ syntax only works for ELF. */
-#define SECTION(x) asm (".section " x);
-#endif
+/* Embed an #include to pull in the alignment and .end directives. */
+asm ("\n#include \"defs.h\"");
-/* 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\
-rm -f crti.s-new crtn.s-new\n\
-mv crtcommon.tmp crti.s-new\n\
-cp crti.s-new crtn.s-new");
-
-/* Extract a `.end' if one is produced by the compiler. */
-asm ("fgrep .end >/dev/null 2>&1 <<\\EOF.end && need_end=yes");
-void
-useless_function (void)
-{
- return;
-}
-asm ("\nEOF.end\n");
+/* The initial common code ends here. */
+asm ("\n/*@HEADER_ENDS*/");
-/* Find out how much alignment is produced by the compiler. */
-asm ("align=`awk '$1==\".align\" { if ($2>max) max=$2; } END { print max; }' \
-<<\\EOF.align");
+/* To determine whether we need .end and .align: */
+asm ("\n/*@TESTS_BEGIN*/");
void
-useless_function2 (void (*foo) (void))
+dummy (void (*foo) (void))
{
if (foo)
(*foo) ();
}
-asm ("\nEOF.align\n`\n");
+asm ("\n/*@TESTS_END*/");
-/* Append the .init prologue to crti.s-new. */
-asm ("cat >> crti.s-new <<\\EOF.crti.init");
+/* The beginning of _init: */
+asm ("\n/*@_init_PROLOG_BEGINS*/");
SECTION (".init")
void
gcrt1.o to reference a symbol which would be defined by some library
module which has a constructor; but then user code's constructors
would come first, and not be profiled. */
- extern void __gmon_start__ (void); weak_extern (__gmon_start__)
+ extern void __gmon_start__ (void) __attribute__ ((weak)); /*weak_extern (__gmon_start__);*/
+
if (__gmon_start__)
__gmon_start__ ();
- /* End the here document containing the .init prologue code.
- Then fetch the .section directive just written and append that
- to crtn.s-new, followed by the function epilogue. */
- asm ("\n\
-EOF.crti.init\n\
- test -n \"$align\" && echo .align $align >> crti.s-new\n\
- test -n \"$need_end\" && echo .end _init >> crti.s-new\n\
- fgrep .init crti.s-new >>crtn.s-new\n\
- fgrep -v .end >> crtn.s-new <<\\EOF.crtn.init");
+ 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*/");
SECTION (".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\
-test -n \"$align\" && echo .align $align >> crti.s-new\n\
-test -n \"$need_end\" && echo .end _fini >> crti.s-new\n\
-cat > /dev/null <<\\EOF.fini.skip");
+
+ /* 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
i_am_not_a_leaf ();
}
- asm ("\nEOF.fini.skip\
-\n\
- fgrep .fini crti.s-new >>crtn.s-new\n\
- fgrep -v .end >> crtn.s-new <<\\EOF.crtn.fini");
+ /* 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