linux/arch/openrisc/Makefile
Stafford Horne 87e387acd8 openrisc: Add gcc machine instruction flag configuration
OpenRISC GCC supports flags to enable the backend to output instructions
if they are supported by a target processor.  This patch adds
configuration flags to enable configuring these flags to tune the kernel
for a particular CPU configuration.

In the future we could also enable all of these flags by default and
provide instruction emulation in the kernel to make these choices easier
for users but this is what we provide for now.

Signed-off-by: Stafford Horne <shorne@gmail.com>
2022-05-23 17:15:49 +09:00

66 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
head-y := arch/openrisc/kernel/head.o
libs-y += $(LIBGCC)
PHONY += vmlinux.bin
vmlinux.bin: vmlinux
$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@