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authorUlrich Drepper <drepper@redhat.com>1997-04-18 00:20:23 +0000
committerUlrich Drepper <drepper@redhat.com>1997-04-18 00:20:23 +0000
commit307bcd77838a5546a4fa65e7a88258a6ea78898c (patch)
treea0df3b4ed5d08f34b204955332c533c0114ee407 /csu/initfini.c
parentdd33e89fb2693e88ba64e6b947184c5abf70ff00 (diff)
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Rewrite by Zack Weinberg.cvs/libc-ud-970417
1997-04-18 02:18 Ulrich Drepper <drepper@cygnus.com> * csu/initfini.c: Rewrite by Zack Weinberg <zack@rabi.phys.columbia.edu>. * csu/Makefile: Add rules for rewrite. * csu/defs.awk: Helper script to generate derived header.
Diffstat (limited to 'csu/initfini.c')
-rw-r--r--csu/initfini.c127
1 files changed, 48 insertions, 79 deletions
diff --git a/csu/initfini.c b/csu/initfini.c
index 0fdfe5d..96ee7bc 100644
--- a/csu/initfini.c
+++ b/csu/initfini.c
@@ -1,5 +1,5 @@
/* 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
@@ -26,68 +26,40 @@
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=$2; } END { print max; }' \
-<<\\EOF.align");
+/* To determine whether we need .end and .align: */
+asm ("\n/*@TESTS_BEGIN*/");
void
-useless_function2 (void (*foo) (void))
+dummy (void (*foo) (void))
{
if (foo)
(*foo) ();
}
-asm ("\nEOF.align\n`\n");
+asm ("\n/*@TESTS_END*/");
-/* Append the .init prologue to crti.s-new. */
-asm ("cat >> crti.s-new <<\\EOF.crti.init");
+/* The beginning of _init: */
+asm ("\n/*@_init_PROLOG_BEGINS*/");
SECTION (".init")
void
@@ -99,38 +71,32 @@ _init (void)
gcrt1.o to reference a symbol which would be defined by some library
module which has a constructor; but then user code's constructors
would come first, and not be profiled. */
- extern void __gmon_start__ (void); weak_extern (__gmon_start__)
+ extern void __gmon_start__ (void) __attribute__ ((weak)); /*weak_extern (__gmon_start__);*/
+
if (__gmon_start__)
__gmon_start__ ();
- /* End the here document containing the .init prologue code.
- Then fetch the .section directive just written and append that
- to crtn.s-new, followed by the function epilogue. */
- asm ("\n\
-EOF.crti.init\n\
- test -n \"$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("END_INIT");
+ /* Now the epilog. */
+ asm ("\n/*@_init_PROLOG_ENDS*/");
+ asm ("\n/*@_init_EPILOG_BEGINS*/");
+ SECTION(".init");
+ asm ("ALIGN");
}
+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 ("END_FINI");
+ asm ("\n/*@_fini_PROLOG_ENDS*/");
{
/* Let GCC know that _fini is not a leaf function by having a dummy
@@ -140,14 +106,17 @@ cat > /dev/null <<\\EOF.fini.skip");
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 ("ALIGN");
}
+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*/");
+asm ("ALIGN");
-/* 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. */