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Rewrite by Zack Weinberg.
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.
This commit is contained in:
Ulrich Drepper
parent
dd33e89fb2
commit
307bcd7783
@ -1,3 +1,10 @@
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1997-04-18 02:18 Ulrich Drepper <drepper@cygnus.com>
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* csu/initfini.c: Rewrite by Zack Weinberg
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<zack@rabi.phys.columbia.edu>.
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* csu/Makefile: Add rules for rewrite.
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* csu/defs.awk: Helper script to generate derived header.
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1997-04-17 16:55 Ulrich Drepper <drepper@cygnus.com>
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* misc/libgen.h: Change prototype for of basename to XPG variant.
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42
csu/Makefile
42
csu/Makefile
@ -1,6 +1,6 @@
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# Makefile for csu code for GNU C library.
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# Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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# Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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@ -56,7 +56,7 @@ have-initfini = yes
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endif
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ifeq (yes,$(have-initfini))
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ifeq ($(have-initfini),yes)
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CPPFLAGS += -DHAVE_INITFINI
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@ -67,27 +67,29 @@ crtstuff = crti crtn
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install-lib += $(crtstuff:=.o)
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extra-objs += $(crtstuff:=.o)
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generated += $(crtstuff:=.s)
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generated += $(crtstuff:=.S) initfini.s align.h end.h
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omit-deps += $(crtstuff)
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# Compile initfini.c to assembly code, which contains embedded shell
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# commands that produce crti.s-new and crtn.s-new when run. We need to
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# disable emission of .size directives and debugging information, since
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# they will get confused by the splitting of the output we do.
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$(objpfx)cr%i.s $(objpfx)cr%n.s: initfini.c; $(initfini)
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# Special rules for the building of crti.o and crtn.o
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$(objpfx)crt%.o: $(objpfx)crt%.S $(objpfx)defs.h
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$(CC) -c -fPIC -g0 -I$(..) -I$(common-objpfx) -DASSEMBLER $< -o $@
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define initfini
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-rm -f $(objpfx)crtcommon.tmp
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(echo 'cat > crtcommon.tmp <<\EOF_common'; \
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$(CC) $< $(CPPFLAGS) $(CFLAGS) \
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-fPIC -finhibit-size-directive $(no-exceptions) -g0 -S -o -; \
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echo 'EOF_common') | (cd $(@D); $(SHELL))
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cat $(objpfx)crtcommon.tmp >> $(objpfx)crti.s-new
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cat $(objpfx)crtcommon.tmp >> $(objpfx)crtn.s-new
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rm -f $(objpfx)crtcommon.tmp
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mv -f $(objpfx)crti.s-new $(subst crtn,crti,$@)
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mv -f $(objpfx)crtn.s-new $(subst crti,crtn,$@)
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endef
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$(objpfx)initfini.s: initfini.c
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$(CC) -S -fPIC -finhibit-size-directive $(no-exceptions) $< -o $@
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$(objpfx)crti.S: $(objpfx)initfini.s
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sed -n -e '1,/@HEADER_ENDS/p' \
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-e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
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-e '/@TRAILER_BEGINS/,$$p' $< > $@
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$(objpfx)crtn.S: $(objpfx)initfini.s
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sed -n -e '1,/@HEADER_ENDS/p' \
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-e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
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-e '/@TRAILER_BEGINS/,$$p' $< > $@
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$(objpfx)defs.h: $(objpfx)initfini.s
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sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
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awk -f defs.awk > $@
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endif
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22
csu/defs.awk
Normal file
22
csu/defs.awk
Normal file
@ -0,0 +1,22 @@
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/.end/ { need_end = 1 }
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/.align/ { if($2 > max) max = $2; }
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END {
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if(need_end)
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{
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print "#define END_INIT .end _init";
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print "#define END_FINI .end _fini";
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}
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else
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{
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print "#define END_INIT";
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print "#define END_FINI";
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}
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if(max)
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print "#define ALIGN .align", max;
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else
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print "#define ALIGN";
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print "#include <libc-symbols.h>";
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print "weak_extern (__gmon_start__)";
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}
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127
csu/initfini.c
127
csu/initfini.c
@ -1,5 +1,5 @@
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/* Special .init and .fini section support.
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Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it
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@ -26,68 +26,40 @@
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write to the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* This file is compiled into assembly code which is then surrounded by the
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lines `cat > crtcommon.tmp <<\EOF_common' and `EOF_common' and thus
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becomes a shell script which creates three files of assembly code.
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/* This file is compiled into assembly code which is then munged by a sed
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script into two files: crti.s and crtn.s.
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* The first file is crti.s-new; this puts a function prologue at the
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beginning of the .init and .fini sections and defines global symbols for
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* crti.s puts a function prologue at the beginning of the
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.init and .fini sections and defines global symbols for
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those addresses, so they can be called as functions.
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* The second file is crtn.s-new; this puts the corresponding function
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epilogues in the .init and .fini sections.
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* The third file is crtcommon.tmp, which is whatever miscellaneous cruft
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the compiler generated at the end; it should be appended to both crti.s-new
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and crtn.s-new. */
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* crtn.s puts the corresponding function epilogues
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in the .init and .fini sections. */
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#include <stdlib.h>
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/* We use embedded asm for .section unconditionally, as this makes it
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easier to insert the necessary directives into crtn.S. */
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#define SECTION(x) asm (".section \"" x "\"");
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#ifdef HAVE_ELF
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/* These declarations make the functions go in the right sections when
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we define them below. GCC syntax does not allow the attribute
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specifications to be in the function definitions themselves. */
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void _init (void) __attribute__ ((section (".init")));
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void _fini (void) __attribute__ ((section (".fini")));
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/* Embed an #include to pull in the alignment and .end directives. */
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asm ("\n#include \"defs.h\"");
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#define SECTION(x) /* Put nothing extra before the defn. */
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/* The initial common code ends here. */
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asm ("\n/*@HEADER_ENDS*/");
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#else
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/* Some non-ELF systems support .init and .fini sections,
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but the __attribute__ syntax only works for ELF. */
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#define SECTION(x) asm (".section " x);
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#endif
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/* End the here document containing the initial common code.
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Then move the output file crtcommon.tmp to crti.s-new and crtn.s-new. */
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asm ("\nEOF_common\n\
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rm -f crti.s-new crtn.s-new\n\
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mv crtcommon.tmp crti.s-new\n\
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cp crti.s-new crtn.s-new");
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/* Extract a `.end' if one is produced by the compiler. */
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asm ("fgrep .end >/dev/null 2>&1 <<\\EOF.end && need_end=yes");
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/* To determine whether we need .end and .align: */
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asm ("\n/*@TESTS_BEGIN*/");
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void
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useless_function (void)
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{
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return;
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}
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asm ("\nEOF.end\n");
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/* Find out how much alignment is produced by the compiler. */
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asm ("align=`awk '$1==\".align\" { if ($2>max) max=$2; } END { print max; }' \
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<<\\EOF.align");
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void
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useless_function2 (void (*foo) (void))
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dummy (void (*foo) (void))
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{
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if (foo)
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(*foo) ();
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}
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asm ("\nEOF.align\n`\n");
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asm ("\n/*@TESTS_END*/");
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/* Append the .init prologue to crti.s-new. */
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asm ("cat >> crti.s-new <<\\EOF.crti.init");
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/* The beginning of _init: */
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asm ("\n/*@_init_PROLOG_BEGINS*/");
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SECTION (".init")
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void
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@ -99,38 +71,32 @@ _init (void)
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gcrt1.o to reference a symbol which would be defined by some library
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module which has a constructor; but then user code's constructors
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would come first, and not be profiled. */
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extern void __gmon_start__ (void); weak_extern (__gmon_start__)
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extern void __gmon_start__ (void) __attribute__ ((weak)); /*weak_extern (__gmon_start__);*/
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if (__gmon_start__)
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__gmon_start__ ();
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/* End the here document containing the .init prologue code.
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Then fetch the .section directive just written and append that
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to crtn.s-new, followed by the function epilogue. */
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asm ("\n\
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EOF.crti.init\n\
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test -n \"$align\" && echo .align $align >> crti.s-new\n\
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test -n \"$need_end\" && echo .end _init >> crti.s-new\n\
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fgrep .init crti.s-new >>crtn.s-new\n\
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fgrep -v .end >> crtn.s-new <<\\EOF.crtn.init");
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asm("END_INIT");
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/* Now the epilog. */
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asm ("\n/*@_init_PROLOG_ENDS*/");
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asm ("\n/*@_init_EPILOG_BEGINS*/");
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SECTION(".init");
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asm ("ALIGN");
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}
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asm ("END_INIT");
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/* End the here document containing the .init epilogue code.
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Then append the .fini prologue to crti.s-new. */
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asm ("\nEOF.crtn.init\
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\n\
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cat >> crti.s-new <<\\EOF.crti.fini");
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/* End of the _init epilog, beginning of the _fini prolog. */
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asm ("\n/*@_init_EPILOG_ENDS*/");
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asm ("\n/*@_fini_PROLOG_BEGINS*/");
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SECTION (".fini")
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void
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_fini (void)
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{
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/* End the here document containing the .fini prologue code.
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Then fetch the .section directive just written and append that
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to crtn.s-new, followed by the function epilogue. */
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asm ("\nEOF.crti.fini\n\
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test -n \"$align\" && echo .align $align >> crti.s-new\n\
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test -n \"$need_end\" && echo .end _fini >> crti.s-new\n\
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cat > /dev/null <<\\EOF.fini.skip");
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/* End of the _fini prolog. */
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asm ("END_FINI");
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asm ("\n/*@_fini_PROLOG_ENDS*/");
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{
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/* Let GCC know that _fini is not a leaf function by having a dummy
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@ -140,14 +106,17 @@ cat > /dev/null <<\\EOF.fini.skip");
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i_am_not_a_leaf ();
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}
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asm ("\nEOF.fini.skip\
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\n\
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fgrep .fini crti.s-new >>crtn.s-new\n\
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fgrep -v .end >> crtn.s-new <<\\EOF.crtn.fini");
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/* Beginning of the _fini epilog. */
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asm ("\n/*@_fini_EPILOG_BEGINS*/");
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SECTION (".fini");
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asm ("ALIGN");
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}
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asm ("END_FINI");
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/* End the here document containing the .fini epilogue code.
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Finally, put the remainder of the generated assembly into crtcommon.tmp. */
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asm ("\nEOF.crtn.fini\
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\n\
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cat > crtcommon.tmp <<\\EOF_common");
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/* End of the _fini epilog. Any further generated assembly (e.g. .ident)
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is shared between both crt files. */
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asm ("\n/*@_fini_EPILOG_ENDS*/");
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asm ("\n/*@TRAILER_BEGINS*/");
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asm ("ALIGN");
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/* End of file. */
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