1# 2# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 3# 4# This program is free software; you can redistribute it and/or modify 5# it under the terms of the GNU General Public License version 2 as 6# published by the Free Software Foundation. 7# 8 9UTS_MACHINE := arc 10 11ifeq ($(CROSS_COMPILE),) 12CROSS_COMPILE := arc-linux-uclibc- 13endif 14 15KBUILD_DEFCONFIG := nsim_700_defconfig 16 17cflags-y += -mA7 -fno-common -pipe -fno-builtin -D__linux__ 18 19ifdef CONFIG_ARC_CURR_IN_REG 20# For a global register defintion, make sure it gets passed to every file 21# We had a customer reported bug where some code built in kernel was NOT using 22# any kernel headers, and missing the r25 global register 23# Can't do unconditionally because of recursive include issues 24# due to <linux/thread_info.h> 25LINUXINCLUDE += -include ${src}/arch/arc/include/asm/current.h 26endif 27 28upto_gcc44 := $(call cc-ifversion, -le, 0404, y) 29atleast_gcc44 := $(call cc-ifversion, -ge, 0404, y) 30atleast_gcc48 := $(call cc-ifversion, -ge, 0408, y) 31 32cflags-$(atleast_gcc44) += -fsection-anchors 33 34cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock 35cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape 36cflags-$(CONFIG_ARC_HAS_RTSC) += -mrtsc 37cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables 38 39# By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok 40ifeq ($(atleast_gcc48),y) 41cflags-$(CONFIG_ARC_DW2_UNWIND) += -gdwarf-2 42endif 43 44ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE 45# Generic build system uses -O2, we want -O3 46cflags-y += -O3 47endif 48 49# small data is default for elf32 tool-chain. If not usable, disable it 50# This also allows repurposing GP as scratch reg to gcc reg allocator 51disable_small_data := y 52cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp 53 54cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian 55ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB 56 57# STAR 9000518362: (fixed with binutils shipping with gcc 4.8) 58# arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept 59# --build-id w/o "-marclinux". Default arc-elf32-ld is OK 60ldflags-$(upto_gcc44) += -marclinux 61 62ifndef CONFIG_ARC_HAS_HW_MPY 63 cflags-y += -mno-mpy 64endif 65 66LIBGCC := $(shell $(CC) $(cflags-y) --print-libgcc-file-name) 67 68# Modules with short calls might break for calls into builtin-kernel 69KBUILD_CFLAGS_MODULE += -mlong-calls 70 71# Finally dump eveything into kernel build system 72KBUILD_CFLAGS += $(cflags-y) 73KBUILD_AFLAGS += $(KBUILD_CFLAGS) 74LDFLAGS += $(ldflags-y) 75 76head-y := arch/arc/kernel/head.o 77 78# See arch/arc/Kbuild for content of core part of the kernel 79core-y += arch/arc/ 80 81# w/o this dtb won't embed into kernel binary 82core-y += arch/arc/boot/dts/ 83 84core-$(CONFIG_ARC_PLAT_FPGA_LEGACY) += arch/arc/plat-arcfpga/ 85core-$(CONFIG_ARC_PLAT_TB10X) += arch/arc/plat-tb10x/ 86 87drivers-$(CONFIG_OPROFILE) += arch/arc/oprofile/ 88 89libs-y += arch/arc/lib/ $(LIBGCC) 90 91boot := arch/arc/boot 92 93#default target for make without any arguements. 94KBUILD_IMAGE := bootpImage 95 96all: $(KBUILD_IMAGE) 97bootpImage: vmlinux 98 99boot_targets += uImage uImage.bin uImage.gz 100 101$(boot_targets): vmlinux 102 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 103 104%.dtb %.dtb.S %.dtb.o: scripts 105 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@ 106 107dtbs: scripts 108 $(Q)$(MAKE) $(build)=$(boot)/dts dtbs 109 110archclean: 111 $(Q)$(MAKE) $(clean)=$(boot) 112 113# Hacks to enable final link due to absence of link-time branch relexation 114# and gcc choosing optimal(shorter) branches at -O3 115# 116# vineetg Feb 2010: -mlong-calls switched off for overall kernel build 117# However lib/decompress_inflate.o (.init.text) calls 118# zlib_inflate_workspacesize (.text) causing relocation errors. 119# Thus forcing all exten calls in this file to be long calls 120export CFLAGS_decompress_inflate.o = -mmedium-calls 121export CFLAGS_initramfs.o = -mmedium-calls 122ifdef CONFIG_SMP 123export CFLAGS_core.o = -mmedium-calls 124endif 125