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-elf32- 13endif 14 15KBUILD_DEFCONFIG := fpga_defconfig 16 17cflags-y += -mA7 -fno-common -pipe -fno-builtin -D__linux__ 18 19LINUXINCLUDE += -include ${src}/arch/arc/include/asm/defines.h 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 (like above) because of recursive include issues 26# due to <linux/thread_info.h> 27LINUXINCLUDE += -include ${src}/arch/arc/include/asm/current.h 28endif 29 30atleast_gcc44 := $(call cc-ifversion, -gt, 0402, y) 31cflags-$(atleast_gcc44) += -fsection-anchors 32 33cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock 34cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape 35cflags-$(CONFIG_ARC_HAS_RTSC) += -mrtsc 36cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables 37 38ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE 39# Generic build system uses -O2, we want -O3 40cflags-y += -O3 41endif 42 43# small data is default for elf32 tool-chain. If not usable, disable it 44# This also allows repurposing GP as scratch reg to gcc reg allocator 45disable_small_data := y 46cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp 47 48cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian 49ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB 50 51# STAR 9000518362: 52# arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept 53# --build-id w/o "-marclinux". 54# Default arc-elf32-ld is OK 55ldflags-y += -marclinux 56 57ARC_LIBGCC := -mA7 58cflags-$(CONFIG_ARC_HAS_HW_MPY) += -multcost=16 59 60ifndef CONFIG_ARC_HAS_HW_MPY 61 cflags-y += -mno-mpy 62 63# newlib for ARC700 assumes MPY to be always present, which is generally true 64# However, if someone really doesn't want MPY, we need to use the 600 ver 65# which coupled with -mno-mpy will use mpy emulation 66# With gcc 4.4.7, -mno-mpy is enough to make any other related adjustments, 67# e.g. increased cost of MPY. With gcc 4.2.1 this had to be explicitly hinted 68 69 ARC_LIBGCC := -marc600 70 ifneq ($(atleast_gcc44),y) 71 cflags-y += -multcost=30 72 endif 73endif 74 75LIBGCC := $(shell $(CC) $(ARC_LIBGCC) $(cflags-y) --print-libgcc-file-name) 76 77# Modules with short calls might break for calls into builtin-kernel 78KBUILD_CFLAGS_MODULE += -mlong-calls 79 80# Finally dump eveything into kernel build system 81KBUILD_CFLAGS += $(cflags-y) 82KBUILD_AFLAGS += $(KBUILD_CFLAGS) 83LDFLAGS += $(ldflags-y) 84 85head-y := arch/arc/kernel/head.o 86 87# See arch/arc/Kbuild for content of core part of the kernel 88core-y += arch/arc/ 89 90# w/o this dtb won't embed into kernel binary 91core-y += arch/arc/boot/dts/ 92 93core-$(CONFIG_ARC_PLAT_FPGA_LEGACY) += arch/arc/plat-arcfpga/ 94core-$(CONFIG_ARC_PLAT_TB10X) += arch/arc/plat-tb10x/ 95 96drivers-$(CONFIG_OPROFILE) += arch/arc/oprofile/ 97 98libs-y += arch/arc/lib/ $(LIBGCC) 99 100boot := arch/arc/boot 101 102#default target for make without any arguements. 103KBUILD_IMAGE := bootpImage 104 105all: $(KBUILD_IMAGE) 106bootpImage: vmlinux 107 108boot_targets += uImage uImage.bin uImage.gz 109 110$(boot_targets): vmlinux 111 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@ 112 113%.dtb %.dtb.S %.dtb.o: scripts 114 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@ 115 116dtbs: scripts 117 $(Q)$(MAKE) $(build)=$(boot)/dts dtbs 118 119archclean: 120 $(Q)$(MAKE) $(clean)=$(boot) 121 122# Hacks to enable final link due to absence of link-time branch relexation 123# and gcc choosing optimal(shorter) branches at -O3 124# 125# vineetg Feb 2010: -mlong-calls switched off for overall kernel build 126# However lib/decompress_inflate.o (.init.text) calls 127# zlib_inflate_workspacesize (.text) causing relocation errors. 128# Thus forcing all exten calls in this file to be long calls 129export CFLAGS_decompress_inflate.o = -mmedium-calls 130export CFLAGS_initramfs.o = -mmedium-calls 131ifdef CONFIG_SMP 132export CFLAGS_core.o = -mmedium-calls 133endif 134