diff options
Diffstat (limited to 'csu')
| -rw-r--r-- | csu/Makefile | 48 | ||||
| -rw-r--r-- | csu/initfini.c | 17 |
2 files changed, 46 insertions, 19 deletions
diff --git a/csu/Makefile b/csu/Makefile index 6de77b7..4943087 100644 --- a/csu/Makefile +++ b/csu/Makefile @@ -39,33 +39,51 @@ all: # Make this the default target; it will be defined in Rules. include ../Makeconfig ifneq ($(elf),yes) + # When not using ELF, there is just one startfile, called crt0.o. start-installed-name = crt0.o + else + # In the ELF universe, crt0.o is called crt1.o, and there are # some additional bizarre files. start-installed-name = crt1.o -install-lib += crti.o crtn.o -extra-objs += crti.o crtn.o -generated += crti.s crtn.s -omit-deps += crti crtn + +# These are the special initializer/finalizer files. They are always the +# first and last file in the link. crti.o ... crtn.o are used for normal +# linking; they define the global "functions" _init and _fini to run the +# .init and .fini sections. crti_s.o ... crtn_s.o are for making shared +# library objects; they put the prologue/epilogue code into the .init and +# .fini sections, but define no global symbols. +crtstuff = crti crtn crti_s crtn_s + +install-lib += $(crtstuff:=.o) +extra-objs += $(crtstuff:=.o) +generated += $(crtstuff:=.s) +omit-deps += $(crtstuff) # Compile initfini.c to assembly code, which contains embedded shell # commands that prodice crti.s-new and crtn.s-new when run. We need to # disable emission of .size directives and debugging information, since # they will get confused by the splitting of the output we do. -$(objpfx)cr%i.s $(objpfx)cr%n.s: initfini.c - -rm -f $(objpfx)crtcommon.tmp - (echo 'cat > crtcommon.tmp <<\EOF_common'; \ - $(CC) $< $(CPPFLAGS) $(CFLAGS) -finhibit-size-directive -g0 -S -o -; \ - echo 'EOF_common') | (cd $(@D); $(SHELL)) - cat $(objpfx)crtcommon.tmp >> $(objpfx)crti.s-new - cat $(objpfx)crtcommon.tmp >> $(objpfx)crtn.s-new - rm -f $(objpfx)crtcommon.tmp - mv -f $(objpfx)crti.s-new $(objpfx)crti.s - mv -f $(objpfx)crtn.s-new $(objpfx)crtn.s -endif +$(objpfx)cr%i.s $(objpfx)cr%n.s: initfini.c; $(initfini) +$(objpfx)cr%i_s.s $(objpfx)cr%n_s.s: initfini.c; $(initfini) + +define initfini +-rm -f $(objpfx)crtcommon.tmp +(echo 'cat > crtcommon.tmp <<\EOF_common'; \ + $(CC) $< $(CPPFLAGS) $(CFLAGS) \ + $(patsubst %,-DGLOBAL=static,$(filter %_s.s,$@)) \ + -finhibit-size-directive -g0 -S -o -; \ + echo 'EOF_common') | (cd $(@D); $(SHELL)) +cat $(objpfx)crtcommon.tmp >> $(objpfx)crti.s-new +cat $(objpfx)crtcommon.tmp >> $(objpfx)crtn.s-new +rm -f $(objpfx)crtcommon.tmp +mv -f $(objpfx)crti.s-new $(subst crtn,crti,$@) +mv -f $(objpfx)crtn.s-new $(subst crti,crtn,$@) +endef +endif include ../Rules diff --git a/csu/initfini.c b/csu/initfini.c index ea16e62..bfd120b 100644 --- a/csu/initfini.c +++ b/csu/initfini.c @@ -34,11 +34,18 @@ Cambridge, MA 02139, USA. */ #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. */ -void _init (void) __attribute__ ((section (".init"))); -void _fini (void) __attribute__ ((section (".fini"))); +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. */ @@ -48,9 +55,10 @@ 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 +GLOBAL 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. */ @@ -66,9 +74,10 @@ asm ("\nEOF.crtn.init\ \n\ cat >> crti.s-new <<\\EOF.crti.fini"); -void +GLOBAL 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. */ |