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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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87e387acd8
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>
65 lines
1.6 KiB
Makefile
65 lines
1.6 KiB
Makefile
# BK Id: %F% %I% %G% %U% %#%
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#
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# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies.
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#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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# Copyright (C) 1994 by Linus Torvalds
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# Modifications for the OpenRISC architecture:
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# Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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# Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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#
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# Based on:
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# arch/i386/Makefile
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KBUILD_DEFCONFIG := or1ksim_defconfig
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OBJCOPYFLAGS := -O binary -R .note -R .comment -S
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LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
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KBUILD_CFLAGS += -pipe -ffixed-r10 -D__linux__
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KBUILD_CFLAGS += -msfimm -mshftimm
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all: vmlinux.bin
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boot := arch/$(ARCH)/boot
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ifeq ($(CONFIG_OPENRISC_HAVE_INST_MUL),y)
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KBUILD_CFLAGS += $(call cc-option,-mhard-mul)
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else
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KBUILD_CFLAGS += $(call cc-option,-msoft-mul)
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endif
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ifeq ($(CONFIG_OPENRISC_HAVE_INST_DIV),y)
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KBUILD_CFLAGS += $(call cc-option,-mhard-div)
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else
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KBUILD_CFLAGS += $(call cc-option,-msoft-div)
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endif
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ifeq ($(CONFIG_OPENRISC_HAVE_INST_CMOV),y)
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KBUILD_CFLAGS += $(call cc-option,-mcmov)
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endif
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ifeq ($(CONFIG_OPENRISC_HAVE_INST_ROR),y)
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KBUILD_CFLAGS += $(call cc-option,-mror)
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endif
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ifeq ($(CONFIG_OPENRISC_HAVE_INST_RORI),y)
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KBUILD_CFLAGS += $(call cc-option,-mrori)
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endif
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ifeq ($(CONFIG_OPENRISC_HAVE_INST_SEXT),y)
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KBUILD_CFLAGS += $(call cc-option,-msext)
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endif
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head-y := arch/openrisc/kernel/head.o
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libs-y += $(LIBGCC)
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PHONY += vmlinux.bin
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vmlinux.bin: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
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