# Makefile for csu code for GNU C library.
-# Copyright (C) 1995-2006, 2010, 2012 Free Software Foundation, Inc.
+# Copyright (C) 1995-2021 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
# Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public
-# License along with the GNU C Library; if not, write to the Free
-# Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-# 02111-1307 USA.
+# License along with the GNU C Library; if not, see
+# <https://www.gnu.org/licenses/>.
# This directory contains the C startup code (that which calls main). This
# consists of the startfile, built from start.c and installed as crt0.o
# (traditionally) or crt1.o (for ELF). In ELF we also install crti.o and
# crtn.o, special "initializer" and "finalizer" files used in the link
-# to make the .init and .fini sections work right; both these files are
-# built (in an arcane manner) from initfini.c.
+# to make the .init and .fini sections work right.
subdir := csu
+include ../Makeconfig
+
routines = init-first libc-start $(libc-init) sysdep version check_fds \
- libc-tls elf-init dso_handle
+ libc-tls dso_handle
aux = errno
elide-routines.os = libc-tls
-static-only-routines = elf-init
csu-dummies = $(filter-out $(start-installed-name),crt1.o Mcrt1.o)
-extra-objs = start.o gmon-start.o \
+extra-objs = start.o \
$(start-installed-name) g$(start-installed-name) $(csu-dummies) \
S$(start-installed-name)
omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
b$(start-installed-name) $(csu-dummies) \
- S$(start-installed-name))
+ S$(start-installed-name) \
+ r$(start-installed-name) \
+ gr$(start-installed-name))
install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies)
-distribute = initfini.c gmon-start.c start.c defs.awk \
- abi-note.S init.c c not-cancel.h
-generated = version-info.h
-before-compile = $(objpfx)version-info.h
-tests := tst-empty tst-atomic tst-atomic-long
-tests-static := tst-empty
+# No tests are allowed in the csu/ subdirectory because the startup
+# code is compiled with special flags.
+tests =
-all: # Make this the default target; it will be defined in Rules.
+CFLAGS-.o += $(no-stack-protector)
+CFLAGS-.op += $(no-stack-protector)
+CFLAGS-.os += $(no-stack-protector)
-include ../Makeconfig
+# Dummy object not actually used for anything. It is linked into
+# crt1.o nevertheless, which in turn is statically linked into
+# applications, so that build flags matter.
+# See <https://sourceware.org/ml/libc-alpha/2018-07/msg00101.html>.
+# NB: Using $(stack-protector) in this way causes a wrong definition
+# STACK_PROTECTOR_LEVEL due to the preceding $(no-stack-protector),
+# but it does not matter for this source file.
+CFLAGS-static-reloc.os += $(stack-protector)
ifeq (yes,$(build-shared))
-extra-objs += S$(start-installed-name)
+extra-objs += S$(start-installed-name) gmon-start.os
+ifneq ($(start-installed-name),$(static-start-installed-name))
+extra-objs += gmon-start.o
+endif
install-lib += S$(start-installed-name)
generated += start.os
-endif
-
-ifeq (yes,$(build-bounded))
-extra-objs += b$(start-installed-name)
-install-lib += b$(start-installed-name)
-generated += start.ob
+else
+extra-objs += gmon-start.o
endif
ifneq ($(start-installed-name),$(static-start-installed-name))
+# FIXME: Only Hurd defines static-start-installed-name. Hurd needs to
+# provide special rules to support static PIE.
extra-objs += $(static-start-installed-name) g$(static-start-installed-name)
omit-deps += $(patsubst %.o,%,$(static-start-installed-name) \
g$(static-start-installed-name))
install-lib += $(static-start-installed-name) g$(static-start-installed-name)
+else
+ifeq (yes,$(enable-static-pie))
+extra-objs += r$(start-installed-name) gr$(start-installed-name)
+install-lib += r$(start-installed-name) gr$(start-installed-name)
+endif
endif
before-compile += $(objpfx)abi-tag.h
generated += abi-tag.h
-ifeq ($(have-initfini),yes)
-
-CPPFLAGS += -DHAVE_INITFINI
-
# These are the special initializer/finalizer files. They are always the
# first and last file in the link. crti.o ... crtn.o define the global
# "functions" _init and _fini to run the .init and .fini sections.
install-lib += $(crtstuff:=.o)
extra-objs += $(crtstuff:=.o)
-generated += $(crtstuff:=.S) initfini.s defs.h
-omit-deps += $(crtstuff)
-
-# Special rules for the building of crti.o and crtn.o
-$(crtstuff:%=$(objpfx)%.o): %.o: %.S $(objpfx)defs.h
- $(compile.S) -g0 $(ASFLAGS-.os) -o $@
-
-CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions $(fno-unit-at-a-time)
-
-vpath initfini.c $(sysdirs)
-
-$(objpfx)initfini.s: initfini.c $(before-compile)
- $(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \
- $(patsubst -f%,-fno-%,$(exceptions)) -o $@
-
-# We only have one kind of startup code files. Static binaries and
-# shared libraries are build using the PIC version.
-$(objpfx)crti.S: $(objpfx)initfini.s
- sed -n -e '1,/@HEADER_ENDS/p' \
- -e '/@_.*_PROLOG_BEGINS/,/@_.*_PROLOG_ENDS/p' \
- -e '/@TRAILER_BEGINS/,$$p' $< > $@
-
-$(objpfx)crtn.S: $(objpfx)initfini.s
- sed -n -e '1,/@HEADER_ENDS/p' \
- -e '/@_.*_EPILOG_BEGINS/,/@_.*_EPILOG_ENDS/p' \
- -e '/@TRAILER_BEGINS/,$$p' $< > $@
-
-# These explicit rules are necessary when the $(objpfx) subdirectory
-# did not exist at the time make considered the implicit rules using it.
-# This comes up with a fresh build using no_deps=t.
-$(patsubst %,$(objpfx)crt%.o,i n): %.o: %.S
-
-$(objpfx)defs.h: $(objpfx)initfini.s
- sed -n -e '/@TESTS_BEGIN/,/@TESTS_END/p' $< | \
- $(AWK) -f defs.awk > $@
+ifneq ($(multidir),.)
+multilib-extra-objs = $(addprefix $(multidir)/, $(install-lib))
+extra-objs += $(multilib-extra-objs)
endif
-extra-objs += abi-note.o init.o
+extra-objs += abi-note.o init.o static-reloc.o
+ifeq (yes,$(build-shared))
+extra-objs += static-reloc.os
+endif
asm-CPPFLAGS += -I$(objpfx).
+# Enable unwinding so backtrace unwinds to __libc_start_main
+CFLAGS-libc-start.c += -funwind-tables
+
include ../Rules
# Make these in the lib pass so they're available in time to link things with.
# We link the ELF startfile along with a SHT_NOTE section indicating
# the kernel ABI the binaries linked with this library will require.
$(objpfx)$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
+ $(objpfx)init.o $(objpfx)static-reloc.o
+ $(link-relocatable)
+$(objpfx)r$(start-installed-name): $(objpfx)start.o $(objpfx)abi-note.o \
$(objpfx)init.o
$(link-relocatable)
$(objpfx)S$(start-installed-name): $(objpfx)start.os $(objpfx)abi-note.o \
$(objpfx)init.o
$(link-relocatable)
-$(objpfx)b$(start-installed-name): $(objpfx)start.ob $(objpfx)abi-note.ob \
- $(objpfx)init.ob
- $(link-relocatable)
endif
# The profiling startfile is made by linking together the normal
# startfile with gmon-start.o, which defines a constructor function
# to turn on profiling code at startup.
+ifeq (yes,$(build-shared))
+$(objpfx)g$(start-installed-name): \
+ $(objpfx)g%: $(objpfx)S% $(objpfx)gmon-start.os $(objpfx)static-reloc.os
+ $(link-relocatable)
+$(objpfx)gr$(start-installed-name): \
+ $(objpfx)gr%: $(objpfx)r% $(objpfx)gmon-start.o
+ $(link-relocatable)
+ifneq ($(start-installed-name),$(static-start-installed-name))
+$(objpfx)g$(static-start-installed-name): \
+ $(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
+ $(link-relocatable)
+endif
+else
$(addprefix $(objpfx),$(sort g$(start-installed-name) \
g$(static-start-installed-name))): \
$(objpfx)g%: $(objpfx)% $(objpfx)gmon-start.o
$(link-relocatable)
+endif
# These extra files are sometimes expected by system standard linking
# procedures, but we have nothing for them to do. So compile empty files.
if test -r $@.new; then mv -f $@.new $@; \
else echo >&2 'This configuration not matched in $<'; exit 1; fi
-all-Banner-files = $(wildcard $(addsuffix /Banner,\
- $(sort $(subdir-srcdirs) \
- $(sysdeps-srcdirs))))
-$(objpfx)version-info.h: $(common-objpfx)config.make $(all-Banner-files)
- $(make-target-directory)
- (case $(config-os) in \
- linux*) version=`(printf '%s\n%s\n' \
- '#include <linux/version.h>' \
- UTS_RELEASE \
- | $(CC) $(CPPFLAGS) -O -E -P - -DNOT_IN_libc=1 | \
- sed -e 's/"\([^"]*\)".*/\1/p' -e d) 2>/dev/null`;\
- if [ -z "$$version" ]; then \
- version=`(printf '%s\n%s\n' \
- '#include <linux/version.h>' \
- LINUX_VERSION_CODE \
- | $(CC) $(CPPFLAGS) -O -E -P - -DNOT_IN_libc=1 \
- | sed -n -e '/^[123456789].*/p' \
- | awk '{v=$$1; \
- printf("%d.%d.%d\n", \
- v/65535, v/256%256, v%256)}') \
- 2>/dev/null`; \
- fi; \
- if [ -z "$$version" ]; then \
- if [ -r /proc/version ]; then \
- version=`sed 's/.*Linux version \([^ ]*\) .*/>>\1<</' \
- < /proc/version`; \
- else \
- version=`uname -r`; \
- fi; \
- fi; \
- os=`uname -s 2> /dev/null`; \
- if [ -z "$$os" ]; then \
- os=Linux; \
- fi; \
- printf '"Compiled on a %s %s system on %s.\\n"\n' \
- "$$os" "$$version" "`date +%Y-%m-%d`";; \
- *) ;; \
- esac; \
- files="$(all-Banner-files)"; \
- if test -n "$$files"; then \
- printf '"Available extensions:\\n"\n'; \
- sed -e '/^#/d' -e 's/^[[:space:]]*/ /' \
- -e 's/^\(.*\)$$/\"\1\\n\"/' $$files; \
- fi) > $@T
- mv -f $@T $@
+ifneq ($(multidir),.)
+$(addprefix $(objpfx)$(multidir)/, $(install-lib)): $(addprefix $(objpfx), $(install-lib))
+ $(make-link-multidir)
+endif
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