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 ($(CROSS_COMPILE),) 12ifndef CONFIG_CPU_BIG_ENDIAN 13CROSS_COMPILE := arc-linux- 14else 15CROSS_COMPILE := arceb-linux- 16endif 17endif 18 19KBUILD_DEFCONFIG := nsim_700_defconfig 20 21cflags-y += -fno-common -pipe -fno-builtin -D__linux__ 22cflags-$(CONFIG_ISA_ARCOMPACT) += -mA7 23cflags-$(CONFIG_ISA_ARCV2) += -mcpu=archs 24 25is_700 = $(shell $(CC) -dM -E - < /dev/null | grep -q "ARC700" && echo 1 || echo 0) 26 27ifdef CONFIG_ISA_ARCOMPACT 28ifeq ($(is_700), 0) 29 $(error Toolchain not configured for ARCompact builds) 30endif 31endif 32 33ifdef CONFIG_ISA_ARCV2 34ifeq ($(is_700), 1) 35 $(error Toolchain not configured for ARCv2 builds) 36endif 37endif 38 39ifdef CONFIG_ARC_CURR_IN_REG 40# For a global register defintion, make sure it gets passed to every file 41# We had a customer reported bug where some code built in kernel was NOT using 42# any kernel headers, and missing the r25 global register 43# Can't do unconditionally because of recursive include issues 44# due to <linux/thread_info.h> 45LINUXINCLUDE += -include ${src}/arch/arc/include/asm/current.h 46endif 47 48upto_gcc44 := $(call cc-ifversion, -le, 0404, y) 49atleast_gcc44 := $(call cc-ifversion, -ge, 0404, y) 50atleast_gcc48 := $(call cc-ifversion, -ge, 0408, y) 51 52cflags-$(atleast_gcc44) += -fsection-anchors 53 54cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock 55cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape 56 57ifdef CONFIG_ISA_ARCV2 58 59ifndef CONFIG_ARC_HAS_LL64 60cflags-y += -mno-ll64 61endif 62 63ifndef CONFIG_ARC_HAS_DIV_REM 64cflags-y += -mno-div-rem 65endif 66 67endif 68 69cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables 70 71# By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok 72ifeq ($(atleast_gcc48),y) 73cflags-$(CONFIG_ARC_DW2_UNWIND) += -gdwarf-2 74endif 75 76ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE 77# Generic build system uses -O2, we want -O3 78# Note: No need to add to cflags-y as that happens anyways 79# 80# Disable the false maybe-uninitialized warings gcc spits out at -O3 81ARCH_CFLAGS += -O3 $(call cc-disable-warning,maybe-uninitialized,) 82endif 83 84# small data is default for elf32 tool-chain. If not usable, disable it 85# This also allows repurposing GP as scratch reg to gcc reg allocator 86disable_small_data := y 87cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp 88 89cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian 90ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB 91 92# STAR 9000518362: (fixed with binutils shipping with gcc 4.8) 93# arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept 94# --build-id w/o "-marclinux". Default arc-elf32-ld is OK 95ldflags-$(upto_gcc44) += -marclinux 96 97LIBGCC := $(shell $(CC) $(cflags-y) --print-libgcc-file-name) 98 99# Modules with short calls might break for calls into builtin-kernel 100KBUILD_CFLAGS_MODULE += -mlong-calls -mno-millicode 101 102# Finally dump eveything into kernel build system 103KBUILD_CFLAGS += $(cflags-y) 104KBUILD_AFLAGS += $(KBUILD_CFLAGS) 105LDFLAGS += $(ldflags-y) 106 107head-y := arch/arc/kernel/head.o 108 109# See arch/arc/Kbuild for content of core part of the kernel 110core-y += arch/arc/ 111 112# w/o this dtb won't embed into kernel binary 113core-y += arch/arc/boot/dts/ 114 115core-$(CONFIG_ARC_PLAT_SIM) += arch/arc/plat-sim/ 116core-$(CONFIG_ARC_PLAT_TB10X) += arch/arc/plat-tb10x/ 117core-$(CONFIG_ARC_PLAT_AXS10X) += arch/arc/plat-axs10x/ 118 119drivers-$(CONFIG_OPROFILE) += arch/arc/oprofile/ 120 121libs-y += arch/arc/lib/ $(LIBGCC) 122 123boot := arch/arc/boot 124 125#default target for make without any arguements. 126KBUILD_IMAGE := bootpImage 127 128all: $(KBUILD_IMAGE) 129bootpImage: vmlinux 130 131boot_targets += uImage uImage.bin uImage.gz 132 133$(boot_targets): vmlinux 134 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 135 136%.dtb %.dtb.S %.dtb.o: scripts 137 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@ 138 139dtbs: scripts 140 $(Q)$(MAKE) $(build)=$(boot)/dts 141 142archclean: 143 $(Q)$(MAKE) $(clean)=$(boot) 144 145# Hacks to enable final link due to absence of link-time branch relexation 146# and gcc choosing optimal(shorter) branches at -O3 147# 148# vineetg Feb 2010: -mlong-calls switched off for overall kernel build 149# However lib/decompress_inflate.o (.init.text) calls 150# zlib_inflate_workspacesize (.text) causing relocation errors. 151# Thus forcing all exten calls in this file to be long calls 152export CFLAGS_decompress_inflate.o = -mmedium-calls 153export CFLAGS_initramfs.o = -mmedium-calls 154ifdef CONFIG_SMP 155export CFLAGS_core.o = -mmedium-calls 156endif 157