ce697ccee1
Kbuild puts the objects listed in head-y at the head of vmlinux. Conventionally, we do this for head*.S, which contains the kernel entry point. A counter approach is to control the section order by the linker script. Actually, the code marked as __HEAD goes into the ".head.text" section, which is placed before the normal ".text" section. I do not know if both of them are needed. From the build system perspective, head-y is not mandatory. If you can achieve the proper code placement by the linker script only, it would be cleaner. I collected the current head-y objects into head-object-list.txt. It is a whitelist. My hope is it will be reduced in the long run. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
101 lines
2.6 KiB
Makefile
101 lines
2.6 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
|
|
#
|
|
# sparc/Makefile
|
|
#
|
|
# Makefile for the architecture dependent flags and dependencies on the
|
|
# Sparc and sparc64.
|
|
#
|
|
# Copyright (C) 1994,1996,1998 David S. Miller (davem@caip.rutgers.edu)
|
|
# Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz)
|
|
|
|
# We are not yet configured - so test on arch
|
|
ifeq ($(ARCH),sparc64)
|
|
KBUILD_DEFCONFIG := sparc64_defconfig
|
|
else
|
|
KBUILD_DEFCONFIG := sparc32_defconfig
|
|
endif
|
|
|
|
ifeq ($(CONFIG_SPARC32),y)
|
|
#####
|
|
# sparc32
|
|
#
|
|
|
|
CHECKFLAGS += -D__sparc__
|
|
KBUILD_LDFLAGS := -m elf32_sparc
|
|
export BITS := 32
|
|
UTS_MACHINE := sparc
|
|
|
|
# We are adding -Wa,-Av8 to KBUILD_CFLAGS to deal with a specs bug in some
|
|
# versions of gcc. Some gcc versions won't pass -Av8 to binutils when you
|
|
# give -mcpu=v8. This silently worked with older bintutils versions but
|
|
# does not any more.
|
|
KBUILD_CFLAGS += -m32 -mcpu=v8 -pipe -mno-fpu -fcall-used-g5 -fcall-used-g7
|
|
KBUILD_CFLAGS += -Wa,-Av8
|
|
|
|
KBUILD_AFLAGS += -m32 -Wa,-Av8
|
|
|
|
else
|
|
#####
|
|
# sparc64
|
|
#
|
|
|
|
CHECKFLAGS += -D__sparc__ -D__sparc_v9__ -D__arch64__
|
|
KBUILD_LDFLAGS := -m elf64_sparc
|
|
export BITS := 64
|
|
UTS_MACHINE := sparc64
|
|
|
|
KBUILD_CFLAGS += -m64 -pipe -mno-fpu -mcpu=ultrasparc -mcmodel=medlow
|
|
KBUILD_CFLAGS += -ffixed-g4 -ffixed-g5 -fcall-used-g7 -Wno-sign-compare
|
|
KBUILD_CFLAGS += -Wa,--undeclared-regs
|
|
KBUILD_CFLAGS += $(call cc-option,-mtune=ultrasparc3)
|
|
KBUILD_AFLAGS += -m64 -mcpu=ultrasparc -Wa,--undeclared-regs
|
|
|
|
ifeq ($(CONFIG_MCOUNT),y)
|
|
KBUILD_CFLAGS += -pg
|
|
endif
|
|
|
|
endif
|
|
|
|
libs-y += arch/sparc/prom/
|
|
libs-y += arch/sparc/lib/
|
|
|
|
drivers-$(CONFIG_PM) += arch/sparc/power/
|
|
|
|
boot := arch/sparc/boot
|
|
|
|
# Default target
|
|
all: zImage
|
|
|
|
image zImage uImage tftpboot.img vmlinux.aout: vmlinux
|
|
$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
|
|
|
|
install:
|
|
$(call cmd,install)
|
|
|
|
archheaders:
|
|
$(Q)$(MAKE) $(build)=arch/sparc/kernel/syscalls all
|
|
|
|
PHONY += vdso_install
|
|
vdso_install:
|
|
$(Q)$(MAKE) $(build)=arch/sparc/vdso $@
|
|
|
|
# This is the image used for packaging
|
|
KBUILD_IMAGE := $(boot)/zImage
|
|
|
|
# Don't use tabs in echo arguments.
|
|
ifeq ($(ARCH),sparc)
|
|
define archhelp
|
|
echo '* image - kernel image ($(boot)/image)'
|
|
echo '* zImage - stripped kernel image ($(boot)/zImage)'
|
|
echo ' uImage - U-Boot SPARC32 Image (only for LEON)'
|
|
echo ' tftpboot.img - image prepared for tftp'
|
|
endef
|
|
else
|
|
define archhelp
|
|
echo '* vmlinux - standard sparc64 kernel'
|
|
echo '* zImage - stripped and compressed sparc64 kernel ($(boot)/zImage)'
|
|
echo ' vmlinux.aout - a.out kernel for sparc64'
|
|
echo ' tftpboot.img - image prepared for tftp'
|
|
endef
|
|
endif
|