# Makefile for csu code for GNU C library.
-
-# Copyright (C) 1995, 1996, 1997, 1998 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
-# modify it under the terms of the GNU Library General Public License
-# as published by the Free Software Foundation; either version 2 of
-# the License, or (at your option) any later version.
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
# The GNU C Library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-# Library General Public License for more details.
+# Lesser General Public License for more details.
-# You should have received a copy of the GNU Library General Public
-# License along with the GNU C Library; see the file COPYING.LIB. If not,
-# write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-# Boston, MA 02111-1307, USA.
+# You should have received a copy of the GNU Lesser General Public
+# 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 in 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.
+# (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.
subdir := csu
-routines = init-first libc-start
-csu-dummies = $(filter-out $(start-installed-name),crt1.o Mcrt1.o)
-extra-objs = start.o gmon-start.o \
- $(start-installed-name) g$(start-installed-name) \
- $(csu-dummies)
-omit-deps = $(patsubst %.o,%,$(start-installed-name) g$(start-installed-name) \
- $(csu-dummies))
-install-lib = $(start-installed-name) g$(start-installed-name) \
- $(csu-dummies)
-distribute = initfini.c gmon-start.c start.c defs.awk abi-note.S init.c
-
-all: # Make this the default target; it will be defined in Rules.
-
include ../Makeconfig
-ifeq ($(elf),yes)
-before-compile = $(objpfx)abi-tag.h
-generated += abi-tag.h
+routines = init-first libc-start $(libc-init) sysdep version check_fds \
+ libc-tls dso_handle
+aux = errno
+elide-routines.os = libc-tls
+csu-dummies = $(filter-out $(start-installed-name),crt1.o Mcrt1.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) \
+ r$(start-installed-name) \
+ gr$(start-installed-name))
+install-lib = $(start-installed-name) g$(start-installed-name) $(csu-dummies)
+
+# No tests are allowed in the csu/ subdirectory because the startup
+# code is compiled with special flags.
+tests =
+
+CFLAGS-.o += $(no-stack-protector)
+CFLAGS-.op += $(no-stack-protector)
+CFLAGS-.os += $(no-stack-protector)
+
+# 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$(start-installed-name) gmon-start.os
+ifneq ($(start-installed-name),$(static-start-installed-name))
+extra-objs += gmon-start.o
+endif
+install-lib += S$(start-installed-name)
+generated += start.os
+else
+extra-objs += gmon-start.o
endif
-ifeq ($(have-initfini),yes)
+ifneq ($(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
-CPPFLAGS += -DHAVE_INITFINI
+before-compile += $(objpfx)abi-tag.h
+generated += abi-tag.h
# 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
install-lib += $(crtstuff:=.o)
extra-objs += $(crtstuff:=.o)
-generated += $(crtstuff:=.S) initfini.s defs.h
-omit-deps += $(crtstuff)
-
-# Special rules for the building of crti.o and crtn.o
-$(objpfx)crt%.o: $(objpfx)crt%.S $(objpfx)defs.h
- $(compile.S) -g0 $(ASFLAGS-.os) -o $@
-
-CFLAGS-initfini.s = -g0 -fPIC -fno-inline-functions
-
-$(objpfx)initfini.s: initfini.c
- $(compile.c) -S $(CFLAGS-initfini.s) -finhibit-size-directive \
- $(no-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' $< > $@
-
-$(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 += $(multilib-extra-objs)
endif
-ifeq (yes,$(elf))
-extra-objs += abi-note.o init.o
-asm-CPPFLAGS += -I$(objpfx).
+extra-objs += abi-note.o init.o static-reloc.o
+ifeq (yes,$(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.
+subdir_lib: $(extra-objs:%=$(objpfx)%)
+
define link-relocatable
$(CC) -nostdlib -nostartfiles -r -o $@ $^
endef
ifndef start-installed-name-rule
-ifeq (yes,$(elf))
# We link the ELF startfile along with a SHT_NOTE section indicating
-# the the kernel ABI the binaries linked with this library will require.
+# 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
$(link-relocatable)
-else
-# The startfile is installed under different names, so we just call our
-# source file `start.c' and copy to the installed name after compiling.
-$(objpfx)$(start-installed-name): $(objpfx)start.o
- rm -f $@
- ln $< $@
-endif
endif
# The profiling startfile is made by linking together the normal
# startfile with gmon-start.o, which defines a constructor function
# to turn on profiling code at startup.
-$(objpfx)g$(start-installed-name): $(objpfx)$(start-installed-name) \
- $(objpfx)gmon-start.o
+ifeq (yes,$(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
+ $(link-relocatable)
+endif
# These extra files are sometimes expected by system standard linking
# procedures, but we have nothing for them to do. So compile empty files.
-$(addprefix $(objpfx),$(filter-out $(start-installed-name),$(csu-dummies))):
- cp /dev/null $(@:.o=.c)
- $(COMPILE.c) $(@:.o=.c) $(OUTPUT_OPTION)
- rm -f $(@:.o=.c)
+$(addprefix $(objpfx),$(filter-out $(start-installed-name), $(csu-dummies))):\
+ $(before-compile)
+ $(COMPILE.c) -o $@ -x c /dev/null
-/ := $$/# bite me.
+# These headers are used by the startup code.
$(objpfx)abi-tag.h: $(..)abi-tags
$(make-target-directory)
rm -f $@.new
- sed 's/#.*$//;/^[ ]*$$/d' $< | while read conf tag; do \
+ sed -e 's/#.*$$//' -e '/^[ ]*$$/d' $< | \
+ while read conf tagos tagver; do \
test `expr '$(config-machine)-$(config-vendor)-$(config-os)' \
: "$$conf"` != 0 || continue; \
- echo "$$tag" | sed > $@.new \
- 's/[^0-9xXa-fA-F]/ /g;s/ *$//;s/ /,/g;s/^ */#define ABI_TAG /';\
+ ( echo "$$tagos" | \
+ sed -e 's/[^0-9xXa-fA-F ]//' \
+ -e 's/^/#define __ABI_TAG_OS /'; \
+ echo "#ifndef __ABI_TAG_VERSION"; \
+ echo "$$tagver" | \
+ sed -e 's/[^0-9xXa-fA-F]/ /g' -e 's/ *$$//' \
+ -e 's/ /,/g' -e 's/^/# define __ABI_TAG_VERSION /'; \
+ echo "#endif" ) > $@.new; \
done
if test -r $@.new; then mv -f $@.new $@; \
else echo >&2 'This configuration not matched in $<'; exit 1; fi
+
+ifneq ($(multidir),.)
+$(addprefix $(objpfx)$(multidir)/, $(install-lib)): $(addprefix $(objpfx), $(install-lib))
+ $(make-link-multidir)
+endif
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