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>
2.0 KiB
alpha/Makefile
This file is subject to the terms and conditions of the GNU General Public
License. See the file "COPYING" in the main directory of this archive
for more details.
Copyright (C) 1994 by Linus Torvalds
NM := $(NM) -B
LDFLAGS_vmlinux := -static -N #-relax CHECKFLAGS += -D__alpha__ cflags-y := -pipe -mno-fp-regs -ffixed-8 cflags-y += $(call cc-option, -fno-jump-tables)
cpuflags-$(CONFIG_ALPHA_EV4) := -mcpu=ev4 cpuflags-$(CONFIG_ALPHA_EV5) := -mcpu=ev5 cpuflags-$(CONFIG_ALPHA_EV56) := -mcpu=ev56 cpuflags-$(CONFIG_ALPHA_POLARIS) := -mcpu=pca56 cpuflags-$(CONFIG_ALPHA_SX164) := -mcpu=pca56 cpuflags-$(CONFIG_ALPHA_EV6) := -mcpu=ev6 cpuflags-$(CONFIG_ALPHA_EV67) := -mcpu=ev67
If GENERIC, make sure to turn off any instruction set extensions that
the host compiler might have on by default. Given that EV4 and EV5
have the same instruction set, prefer EV5 because an EV5 schedule is
more likely to keep an EV4 processor busy than vice-versa.
cpuflags-$(CONFIG_ALPHA_GENERIC) := -mcpu=ev5
cflags-y += $(cpuflags-y)
For TSUNAMI, we must have the assembler not emulate our instructions.
The same is true for IRONGATE, POLARIS, PYXIS.
BWX is most important, but we don't really want any emulation ever.
KBUILD_CFLAGS += $(cflags-y) -Wa,-mev6
libs-y += arch/alpha/lib/
export what is needed by arch/alpha/boot/Makefile
LIBS_Y := $(patsubst %/, %/lib.a, $(libs-y)) export LIBS_Y
boot := arch/alpha/boot
#Default target when executing make with no arguments all boot: $(boot)/vmlinux.gz
$(boot)/vmlinux.gz: vmlinux $(Q)$(MAKE) $(build)=$(boot) $@
bootimage bootpfile bootpzfile: vmlinux $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
archheaders: $(Q)$(MAKE) $(build)=arch/alpha/kernel/syscalls all
define archhelp echo '* boot - Compressed kernel image (arch/alpha/boot/vmlinux.gz)' echo ' bootimage - SRM bootable image (arch/alpha/boot/bootimage)' echo ' bootpfile - BOOTP bootable image (arch/alpha/boot/bootpfile)' echo ' bootpzfile - compressed kernel BOOTP image (arch/alpha/boot/bootpzfile)' endef