linux/arch/openrisc/Makefile
Masahiro Yamada ce697ccee1 kbuild: remove head-y syntax
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>
2022-10-02 18:06:03 +09:00

64 lines
1.6 KiB
Makefile

# 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) $(boot)/$@