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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>
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BK Id: %F% %I% %G% %U% %#%
This file is included by the global makefile so that you can add your own
architecture-specific flags and dependencies.
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
Modifications for the OpenRISC architecture:
Copyright (C) 2003 Matjaz Breskvar phoenix@bsemi.com
Copyright (C) 2010-2011 Jonas Bonn jonas@southpole.se
Based on:
arch/i386/Makefile
KBUILD_DEFCONFIG := or1ksim_defconfig
OBJCOPYFLAGS := -O binary -R .note -R .comment -S LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
KBUILD_CFLAGS += -pipe -ffixed-r10 -D__linux__ KBUILD_CFLAGS += -msfimm -mshftimm
all: vmlinux.bin
boot := arch/$(ARCH)/boot
ifeq ($(CONFIG_OPENRISC_HAVE_INST_MUL),y) KBUILD_CFLAGS += $(call cc-option,-mhard-mul) else KBUILD_CFLAGS += $(call cc-option,-msoft-mul) endif
ifeq ($(CONFIG_OPENRISC_HAVE_INST_DIV),y) KBUILD_CFLAGS += $(call cc-option,-mhard-div) else KBUILD_CFLAGS += $(call cc-option,-msoft-div) endif
ifeq ($(CONFIG_OPENRISC_HAVE_INST_CMOV),y) KBUILD_CFLAGS += $(call cc-option,-mcmov) endif
ifeq ($(CONFIG_OPENRISC_HAVE_INST_ROR),y) KBUILD_CFLAGS += $(call cc-option,-mror) endif
ifeq ($(CONFIG_OPENRISC_HAVE_INST_RORI),y) KBUILD_CFLAGS += $(call cc-option,-mrori) endif
ifeq ($(CONFIG_OPENRISC_HAVE_INST_SEXT),y) KBUILD_CFLAGS += $(call cc-option,-msext) endif
libs-y += $(LIBGCC)
PHONY += vmlinux.bin
vmlinux.bin: vmlinux $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@