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-linux-uclibc-
15 KBUILD_DEFCONFIG := nsim_700_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 upto_gcc44 := $(call cc-ifversion, -le, 0404, y)
29 atleast_gcc44 := $(call cc-ifversion, -ge, 0404, y)
30 atleast_gcc48 := $(call cc-ifversion, -ge, 0408, y)
32 cflags-$(atleast_gcc44) += -fsection-anchors
34 cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock
35 cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape
36 cflags-$(CONFIG_ARC_HAS_RTSC) += -mrtsc
37 cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables
39 # By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok
40 ifeq ($(atleast_gcc48),y)
41 cflags-$(CONFIG_ARC_DW2_UNWIND) += -gdwarf-2
44 ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
45 # Generic build system uses -O2, we want -O3
46 # Note: No need to add to cflags-y as that happens anyways
50 # small data is default for elf32 tool-chain. If not usable, disable it
51 # This also allows repurposing GP as scratch reg to gcc reg allocator
52 disable_small_data := y
53 cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp
55 cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian
56 ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
58 # STAR 9000518362: (fixed with binutils shipping with gcc 4.8)
59 # arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
60 # --build-id w/o "-marclinux". Default arc-elf32-ld is OK
61 ldflags-$(upto_gcc44) += -marclinux
63 ifndef CONFIG_ARC_HAS_HW_MPY
67 LIBGCC := $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
69 # Modules with short calls might break for calls into builtin-kernel
70 KBUILD_CFLAGS_MODULE += -mlong-calls
72 # Finally dump eveything into kernel build system
73 KBUILD_CFLAGS += $(cflags-y)
74 KBUILD_AFLAGS += $(KBUILD_CFLAGS)
75 LDFLAGS += $(ldflags-y)
77 head-y := arch/arc/kernel/head.o
79 # See arch/arc/Kbuild for content of core part of the kernel
82 # w/o this dtb won't embed into kernel binary
83 core-y += arch/arc/boot/dts/
85 core-$(CONFIG_ARC_PLAT_FPGA_LEGACY) += arch/arc/plat-arcfpga/
86 core-$(CONFIG_ARC_PLAT_TB10X) += arch/arc/plat-tb10x/
88 drivers-$(CONFIG_OPROFILE) += arch/arc/oprofile/
90 libs-y += arch/arc/lib/ $(LIBGCC)
94 #default target for make without any arguements.
95 KBUILD_IMAGE := bootpImage
100 boot_targets += uImage uImage.bin uImage.gz
102 $(boot_targets): vmlinux
103 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
105 %.dtb %.dtb.S %.dtb.o: scripts
106 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
109 $(Q)$(MAKE) $(build)=$(boot)/dts dtbs
112 $(Q)$(MAKE) $(clean)=$(boot)
114 # Hacks to enable final link due to absence of link-time branch relexation
115 # and gcc choosing optimal(shorter) branches at -O3
117 # vineetg Feb 2010: -mlong-calls switched off for overall kernel build
118 # However lib/decompress_inflate.o (.init.text) calls
119 # zlib_inflate_workspacesize (.text) causing relocation errors.
120 # Thus forcing all exten calls in this file to be long calls
121 export CFLAGS_decompress_inflate.o = -mmedium-calls
122 export CFLAGS_initramfs.o = -mmedium-calls
124 export CFLAGS_core.o = -mmedium-calls