2 # Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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.
11 ifeq ($(CROSS_COMPILE),)
12 CROSS_COMPILE := arc-elf32-
15 KBUILD_DEFCONFIG := fpga_defconfig
17 cflags-y += -mA7 -fno-common -pipe -fno-builtin -D__linux__
19 ifdef CONFIG_ARC_CURR_IN_REG
20 # For a global register defintion, make sure it gets passed to every file
21 # We had a customer reported bug where some code built in kernel was NOT using
22 # any kernel headers, and missing the r25 global register
23 # Can't do unconditionally because of recursive include issues
24 # due to <linux/thread_info.h>
25 LINUXINCLUDE += -include ${src}/arch/arc/include/asm/current.h
28 atleast_gcc44 := $(call cc-ifversion, -gt, 0402, y)
29 cflags-$(atleast_gcc44) += -fsection-anchors
31 cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock
32 cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape
33 cflags-$(CONFIG_ARC_HAS_RTSC) += -mrtsc
34 cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables
36 ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
37 # Generic build system uses -O2, we want -O3
41 # small data is default for elf32 tool-chain. If not usable, disable it
42 # This also allows repurposing GP as scratch reg to gcc reg allocator
43 disable_small_data := y
44 cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp
46 cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian
47 ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
50 # arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
51 # --build-id w/o "-marclinux".
52 # Default arc-elf32-ld is OK
53 ldflags-y += -marclinux
56 cflags-$(CONFIG_ARC_HAS_HW_MPY) += -multcost=16
58 ifndef CONFIG_ARC_HAS_HW_MPY
61 # newlib for ARC700 assumes MPY to be always present, which is generally true
62 # However, if someone really doesn't want MPY, we need to use the 600 ver
63 # which coupled with -mno-mpy will use mpy emulation
64 # With gcc 4.4.7, -mno-mpy is enough to make any other related adjustments,
65 # e.g. increased cost of MPY. With gcc 4.2.1 this had to be explicitly hinted
67 ARC_LIBGCC := -marc600
68 ifneq ($(atleast_gcc44),y)
69 cflags-y += -multcost=30
73 LIBGCC := $(shell $(CC) $(ARC_LIBGCC) $(cflags-y) --print-libgcc-file-name)
75 # Modules with short calls might break for calls into builtin-kernel
76 KBUILD_CFLAGS_MODULE += -mlong-calls
78 # Finally dump eveything into kernel build system
79 KBUILD_CFLAGS += $(cflags-y)
80 KBUILD_AFLAGS += $(KBUILD_CFLAGS)
81 LDFLAGS += $(ldflags-y)
83 head-y := arch/arc/kernel/head.o
85 # See arch/arc/Kbuild for content of core part of the kernel
88 # w/o this dtb won't embed into kernel binary
89 core-y += arch/arc/boot/dts/
91 core-$(CONFIG_ARC_PLAT_FPGA_LEGACY) += arch/arc/plat-arcfpga/
92 core-$(CONFIG_ARC_PLAT_TB10X) += arch/arc/plat-tb10x/
94 drivers-$(CONFIG_OPROFILE) += arch/arc/oprofile/
96 libs-y += arch/arc/lib/ $(LIBGCC)
100 #default target for make without any arguements.
101 KBUILD_IMAGE := bootpImage
106 boot_targets += uImage uImage.bin uImage.gz
108 $(boot_targets): vmlinux
109 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
111 %.dtb %.dtb.S %.dtb.o: scripts
112 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
115 $(Q)$(MAKE) $(build)=$(boot)/dts dtbs
118 $(Q)$(MAKE) $(clean)=$(boot)
120 # Hacks to enable final link due to absence of link-time branch relexation
121 # and gcc choosing optimal(shorter) branches at -O3
123 # vineetg Feb 2010: -mlong-calls switched off for overall kernel build
124 # However lib/decompress_inflate.o (.init.text) calls
125 # zlib_inflate_workspacesize (.text) causing relocation errors.
126 # Thus forcing all exten calls in this file to be long calls
127 export CFLAGS_decompress_inflate.o = -mmedium-calls
128 export CFLAGS_initramfs.o = -mmedium-calls
130 export CFLAGS_core.o = -mmedium-calls