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 39ifdef CONFIG_ISA_ARCV2 40 41ifndef CONFIG_ARC_HAS_LL64 42cflags-y += -mno-ll64 43endif 44 45ifndef CONFIG_ARC_HAS_DIV_REM 46cflags-y += -mno-div-rem 47endif 48 49endif 50 51cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables 52 53# By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok 54ifeq ($(atleast_gcc48),y) 55cflags-$(CONFIG_ARC_DW2_UNWIND) += -gdwarf-2 56endif 57 58ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE 59# Generic build system uses -O2, we want -O3 60# Note: No need to add to cflags-y as that happens anyways 61ARCH_CFLAGS += -O3 62endif 63 64# small data is default for elf32 tool-chain. If not usable, disable it 65# This also allows repurposing GP as scratch reg to gcc reg allocator 66disable_small_data := y 67cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp 68 69cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian 70ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB 71 72# STAR 9000518362: (fixed with binutils shipping with gcc 4.8) 73# arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept 74# --build-id w/o "-marclinux". Default arc-elf32-ld is OK 75ldflags-$(upto_gcc44) += -marclinux 76 77LIBGCC := $(shell $(CC) $(cflags-y) --print-libgcc-file-name) 78 79# Modules with short calls might break for calls into builtin-kernel 80KBUILD_CFLAGS_MODULE += -mlong-calls -mno-millicode 81 82# Finally dump eveything into kernel build system 83KBUILD_CFLAGS += $(cflags-y) 84KBUILD_AFLAGS += $(KBUILD_CFLAGS) 85LDFLAGS += $(ldflags-y) 86 87head-y := arch/arc/kernel/head.o 88 89# See arch/arc/Kbuild for content of core part of the kernel 90core-y += arch/arc/ 91 92# w/o this dtb won't embed into kernel binary 93core-y += arch/arc/boot/dts/ 94 95core-$(CONFIG_ARC_PLAT_SIM) += arch/arc/plat-sim/ 96core-$(CONFIG_ARC_PLAT_TB10X) += arch/arc/plat-tb10x/ 97core-$(CONFIG_ARC_PLAT_AXS10X) += arch/arc/plat-axs10x/ 98 99drivers-$(CONFIG_OPROFILE) += arch/arc/oprofile/ 100 101libs-y += arch/arc/lib/ $(LIBGCC) 102 103boot := arch/arc/boot 104 105#default target for make without any arguements. 106KBUILD_IMAGE := bootpImage 107 108all: $(KBUILD_IMAGE) 109bootpImage: vmlinux 110 111boot_targets += uImage uImage.bin uImage.gz 112 113$(boot_targets): vmlinux 114 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 115 116%.dtb %.dtb.S %.dtb.o: scripts 117 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@ 118 119dtbs: scripts 120 $(Q)$(MAKE) $(build)=$(boot)/dts 121 122archclean: 123 $(Q)$(MAKE) $(clean)=$(boot) 124 125# Hacks to enable final link due to absence of link-time branch relexation 126# and gcc choosing optimal(shorter) branches at -O3 127# 128# vineetg Feb 2010: -mlong-calls switched off for overall kernel build 129# However lib/decompress_inflate.o (.init.text) calls 130# zlib_inflate_workspacesize (.text) causing relocation errors. 131# Thus forcing all exten calls in this file to be long calls 132export CFLAGS_decompress_inflate.o = -mmedium-calls 133export CFLAGS_initramfs.o = -mmedium-calls 134ifdef CONFIG_SMP 135export CFLAGS_core.o = -mmedium-calls 136endif 137