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 11KBUILD_DEFCONFIG := fpga_defconfig 12 13cflags-y += -mA7 -fno-common -pipe -fno-builtin -D__linux__ 14 15LINUXINCLUDE += -include ${src}/arch/arc/include/asm/defines.h 16 17ifdef CONFIG_ARC_CURR_IN_REG 18# For a global register defintion, make sure it gets passed to every file 19# We had a customer reported bug where some code built in kernel was NOT using 20# any kernel headers, and missing the r25 global register 21# Can't do unconditionally (like above) because of recursive include issues 22# due to <linux/thread_info.h> 23LINUXINCLUDE += -include ${src}/arch/arc/include/asm/current.h 24endif 25 26atleast_gcc44 := $(call cc-ifversion, -gt, 0402, y) 27cflags-$(atleast_gcc44) += -fsection-anchors 28 29cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock 30cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape 31cflags-$(CONFIG_ARC_HAS_RTSC) += -mrtsc 32cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables 33 34ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE 35# Generic build system uses -O2, we want -O3 36cflags-y += -O3 37endif 38 39# small data is default for elf32 tool-chain. If not usable, disable it 40# This also allows repurposing GP as scratch reg to gcc reg allocator 41disable_small_data := y 42cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp 43 44cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian 45ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB 46 47# STAR 9000518362: 48# arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept 49# --build-id w/o "-marclinux". 50# Default arc-elf32-ld is OK 51ldflags-y += -marclinux 52 53ARC_LIBGCC := -mA7 54cflags-$(CONFIG_ARC_HAS_HW_MPY) += -multcost=16 55 56ifndef CONFIG_ARC_HAS_HW_MPY 57 cflags-y += -mno-mpy 58 59# newlib for ARC700 assumes MPY to be always present, which is generally true 60# However, if someone really doesn't want MPY, we need to use the 600 ver 61# which coupled with -mno-mpy will use mpy emulation 62# With gcc 4.4.7, -mno-mpy is enough to make any other related adjustments, 63# e.g. increased cost of MPY. With gcc 4.2.1 this had to be explicitly hinted 64 65 ARC_LIBGCC := -marc600 66 ifneq ($(atleast_gcc44),y) 67 cflags-y += -multcost=30 68 endif 69endif 70 71LIBGCC := $(shell $(CC) $(ARC_LIBGCC) $(cflags-y) --print-libgcc-file-name) 72 73# Modules with short calls might break for calls into builtin-kernel 74KBUILD_CFLAGS_MODULE += -mlong-calls 75 76# Finally dump eveything into kernel build system 77KBUILD_CFLAGS += $(cflags-y) 78KBUILD_AFLAGS += $(KBUILD_CFLAGS) 79LDFLAGS += $(ldflags-y) 80 81head-y := arch/arc/kernel/head.o 82 83# See arch/arc/Kbuild for content of core part of the kernel 84core-y += arch/arc/ 85 86# w/o this dtb won't embed into kernel binary 87core-y += arch/arc/boot/dts/ 88 89core-$(CONFIG_ARC_PLAT_FPGA_LEGACY) += arch/arc/plat-arcfpga/ 90 91drivers-$(CONFIG_OPROFILE) += arch/arc/oprofile/ 92 93libs-y += arch/arc/lib/ $(LIBGCC) 94 95#default target for make without any arguements. 96KBUILD_IMAGE := bootpImage 97 98all: $(KBUILD_IMAGE) 99boot := arch/arc/boot 100 101bootpImage: vmlinux 102 103uImage: vmlinux 104 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 105 106%.dtb %.dtb.S %.dtb.o: scripts 107 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@ 108 109dtbs: scripts 110 $(Q)$(MAKE) $(build)=$(boot)/dts dtbs 111 112archclean: 113 $(Q)$(MAKE) $(clean)=$(boot) 114 115# Hacks to enable final link due to absence of link-time branch relexation 116# and gcc choosing optimal(shorter) branches at -O3 117# 118# vineetg Feb 2010: -mlong-calls switched off for overall kernel build 119# However lib/decompress_inflate.o (.init.text) calls 120# zlib_inflate_workspacesize (.text) causing relocation errors. 121# Thus forcing all exten calls in this file to be long calls 122export CFLAGS_decompress_inflate.o = -mmedium-calls 123export CFLAGS_initramfs.o = -mmedium-calls 124ifdef CONFIG_SMP 125export CFLAGS_core.o = -mmedium-calls 126endif 127