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 ($(CROSS_COMPILE),) 12CROSS_COMPILE := arc-linux- 13endif 14 15KBUILD_DEFCONFIG := nsim_700_defconfig 16 17cflags-y += -fno-common -pipe -fno-builtin -D__linux__ 18cflags-$(CONFIG_ISA_ARCOMPACT) += -mA7 19cflags-$(CONFIG_ISA_ARCV2) += -mcpu=archs 20 21ifdef CONFIG_ARC_CURR_IN_REG 22# For a global register defintion, make sure it gets passed to every file 23# We had a customer reported bug where some code built in kernel was NOT using 24# any kernel headers, and missing the r25 global register 25# Can't do unconditionally because of recursive include issues 26# due to <linux/thread_info.h> 27LINUXINCLUDE += -include ${src}/arch/arc/include/asm/current.h 28endif 29 30upto_gcc44 := $(call cc-ifversion, -le, 0404, y) 31atleast_gcc44 := $(call cc-ifversion, -ge, 0404, y) 32atleast_gcc48 := $(call cc-ifversion, -ge, 0408, y) 33 34cflags-$(atleast_gcc44) += -fsection-anchors 35 36cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock 37cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape 38 39ifndef CONFIG_ARC_HAS_LL64 40cflags-$(CONFIG_ISA_ARCV2) += -mno-ll64 41endif 42 43cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables 44 45# By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok 46ifeq ($(atleast_gcc48),y) 47cflags-$(CONFIG_ARC_DW2_UNWIND) += -gdwarf-2 48endif 49 50ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE 51# Generic build system uses -O2, we want -O3 52# Note: No need to add to cflags-y as that happens anyways 53ARCH_CFLAGS += -O3 54endif 55 56# small data is default for elf32 tool-chain. If not usable, disable it 57# This also allows repurposing GP as scratch reg to gcc reg allocator 58disable_small_data := y 59cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp 60 61cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian 62ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB 63 64# STAR 9000518362: (fixed with binutils shipping with gcc 4.8) 65# arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept 66# --build-id w/o "-marclinux". Default arc-elf32-ld is OK 67ldflags-$(upto_gcc44) += -marclinux 68 69ifndef CONFIG_ARC_HAS_HW_MPY 70 cflags-y += -mno-mpy 71endif 72 73LIBGCC := $(shell $(CC) $(cflags-y) --print-libgcc-file-name) 74 75# Modules with short calls might break for calls into builtin-kernel 76KBUILD_CFLAGS_MODULE += -mlong-calls 77 78# Finally dump eveything into kernel build system 79KBUILD_CFLAGS += $(cflags-y) 80KBUILD_AFLAGS += $(KBUILD_CFLAGS) 81LDFLAGS += $(ldflags-y) 82 83head-y := arch/arc/kernel/head.o 84 85# See arch/arc/Kbuild for content of core part of the kernel 86core-y += arch/arc/ 87 88# w/o this dtb won't embed into kernel binary 89core-y += arch/arc/boot/dts/ 90 91core-$(CONFIG_ARC_PLAT_SIM) += arch/arc/plat-sim/ 92core-$(CONFIG_ARC_PLAT_TB10X) += arch/arc/plat-tb10x/ 93core-$(CONFIG_ARC_PLAT_AXS10X) += arch/arc/plat-axs10x/ 94 95drivers-$(CONFIG_OPROFILE) += arch/arc/oprofile/ 96 97libs-y += arch/arc/lib/ $(LIBGCC) 98 99boot := arch/arc/boot 100 101#default target for make without any arguements. 102KBUILD_IMAGE := bootpImage 103 104all: $(KBUILD_IMAGE) 105bootpImage: vmlinux 106 107boot_targets += uImage uImage.bin uImage.gz 108 109$(boot_targets): vmlinux 110 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 111 112%.dtb %.dtb.S %.dtb.o: scripts 113 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@ 114 115dtbs: scripts 116 $(Q)$(MAKE) $(build)=$(boot)/dts dtbs 117 118archclean: 119 $(Q)$(MAKE) $(clean)=$(boot) 120 121# Hacks to enable final link due to absence of link-time branch relexation 122# and gcc choosing optimal(shorter) branches at -O3 123# 124# vineetg Feb 2010: -mlong-calls switched off for overall kernel build 125# However lib/decompress_inflate.o (.init.text) calls 126# zlib_inflate_workspacesize (.text) causing relocation errors. 127# Thus forcing all exten calls in this file to be long calls 128export CFLAGS_decompress_inflate.o = -mmedium-calls 129export CFLAGS_initramfs.o = -mmedium-calls 130ifdef CONFIG_SMP 131export CFLAGS_core.o = -mmedium-calls 132endif 133