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 := fpga_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_gcc42 := $(call cc-ifversion, -le, 0402, y) 29upto_gcc44 := $(call cc-ifversion, -le, 0404, y) 30atleast_gcc44 := $(call cc-ifversion, -ge, 0404, y) 31atleast_gcc48 := $(call cc-ifversion, -ge, 0408, y) 32 33cflags-$(atleast_gcc44) += -fsection-anchors 34 35cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock 36cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape 37cflags-$(CONFIG_ARC_HAS_RTSC) += -mrtsc 38cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables 39 40# By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok 41ifeq ($(atleast_gcc48),y) 42cflags-$(CONFIG_ARC_DW2_UNWIND) += -gdwarf-2 43endif 44 45ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE 46# Generic build system uses -O2, we want -O3 47cflags-y += -O3 48endif 49 50# small data is default for elf32 tool-chain. If not usable, disable it 51# This also allows repurposing GP as scratch reg to gcc reg allocator 52disable_small_data := y 53cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp 54 55cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian 56ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB 57 58# STAR 9000518362: (fixed with binutils shipping with gcc 4.8) 59# arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept 60# --build-id w/o "-marclinux". Default arc-elf32-ld is OK 61ldflags-$(upto_gcc44) += -marclinux 62 63ARC_LIBGCC := -mA7 64cflags-$(CONFIG_ARC_HAS_HW_MPY) += -multcost=16 65 66ifndef CONFIG_ARC_HAS_HW_MPY 67 cflags-y += -mno-mpy 68 69# newlib for ARC700 assumes MPY to be always present, which is generally true 70# However, if someone really doesn't want MPY, we need to use the 600 ver 71# which coupled with -mno-mpy will use mpy emulation 72# With gcc 4.4.7, -mno-mpy is enough to make any other related adjustments, 73# e.g. increased cost of MPY. With gcc 4.2.1 this had to be explicitly hinted 74 75 ifeq ($(upto_gcc42),y) 76 ARC_LIBGCC := -marc600 77 cflags-y += -multcost=30 78 endif 79endif 80 81LIBGCC := $(shell $(CC) $(ARC_LIBGCC) $(cflags-y) --print-libgcc-file-name) 82 83# Modules with short calls might break for calls into builtin-kernel 84KBUILD_CFLAGS_MODULE += -mlong-calls 85 86# Finally dump eveything into kernel build system 87KBUILD_CFLAGS += $(cflags-y) 88KBUILD_AFLAGS += $(KBUILD_CFLAGS) 89LDFLAGS += $(ldflags-y) 90 91head-y := arch/arc/kernel/head.o 92 93# See arch/arc/Kbuild for content of core part of the kernel 94core-y += arch/arc/ 95 96# w/o this dtb won't embed into kernel binary 97core-y += arch/arc/boot/dts/ 98 99core-$(CONFIG_ARC_PLAT_FPGA_LEGACY) += arch/arc/plat-arcfpga/ 100core-$(CONFIG_ARC_PLAT_TB10X) += arch/arc/plat-tb10x/ 101 102drivers-$(CONFIG_OPROFILE) += arch/arc/oprofile/ 103 104libs-y += arch/arc/lib/ $(LIBGCC) 105 106boot := arch/arc/boot 107 108#default target for make without any arguements. 109KBUILD_IMAGE := bootpImage 110 111all: $(KBUILD_IMAGE) 112bootpImage: vmlinux 113 114boot_targets += uImage uImage.bin uImage.gz 115 116$(boot_targets): vmlinux 117 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 118 119%.dtb %.dtb.S %.dtb.o: scripts 120 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@ 121 122dtbs: scripts 123 $(Q)$(MAKE) $(build)=$(boot)/dts dtbs 124 125archclean: 126 $(Q)$(MAKE) $(clean)=$(boot) 127 128# Hacks to enable final link due to absence of link-time branch relexation 129# and gcc choosing optimal(shorter) branches at -O3 130# 131# vineetg Feb 2010: -mlong-calls switched off for overall kernel build 132# However lib/decompress_inflate.o (.init.text) calls 133# zlib_inflate_workspacesize (.text) causing relocation errors. 134# Thus forcing all exten calls in this file to be long calls 135export CFLAGS_decompress_inflate.o = -mmedium-calls 136export CFLAGS_initramfs.o = -mmedium-calls 137ifdef CONFIG_SMP 138export CFLAGS_core.o = -mmedium-calls 139endif 140