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-uclibc-
13endif
14
15KBUILD_DEFCONFIG := nsim_700_defconfig
16
17cflags-y	+= -mA7 -fno-common -pipe -fno-builtin -D__linux__
18
19ifdef 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>
25LINUXINCLUDE	+=  -include ${src}/arch/arc/include/asm/current.h
26endif
27
28upto_gcc44    :=  $(call cc-ifversion, -le, 0404, y)
29atleast_gcc44 :=  $(call cc-ifversion, -ge, 0404, y)
30atleast_gcc48 :=  $(call cc-ifversion, -ge, 0408, y)
31
32cflags-$(atleast_gcc44)			+= -fsection-anchors
33
34cflags-$(CONFIG_ARC_HAS_LLSC)		+= -mlock
35cflags-$(CONFIG_ARC_HAS_SWAPE)		+= -mswape
36cflags-$(CONFIG_ARC_HAS_RTSC)		+= -mrtsc
37cflags-$(CONFIG_ARC_DW2_UNWIND)		+= -fasynchronous-unwind-tables
38
39# By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok
40ifeq ($(atleast_gcc48),y)
41cflags-$(CONFIG_ARC_DW2_UNWIND)		+= -gdwarf-2
42endif
43
44ifndef 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
47ARCH_CFLAGS += -O3
48endif
49
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
52disable_small_data := y
53cflags-$(disable_small_data)		+= -mno-sdata -fcall-used-gp
54
55cflags-$(CONFIG_CPU_BIG_ENDIAN)		+= -mbig-endian
56ldflags-$(CONFIG_CPU_BIG_ENDIAN)	+= -EB
57
58# STAR 9000518362: (fixed with binutils shipping with gcc 4.8)
59# arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
60# --build-id w/o "-marclinux". Default arc-elf32-ld is OK
61ldflags-$(upto_gcc44)			+= -marclinux
62
63ifndef CONFIG_ARC_HAS_HW_MPY
64	cflags-y	+= -mno-mpy
65endif
66
67LIBGCC	:= $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
68
69# Modules with short calls might break for calls into builtin-kernel
70KBUILD_CFLAGS_MODULE	+= -mlong-calls
71
72# Finally dump eveything into kernel build system
73KBUILD_CFLAGS	+= $(cflags-y)
74KBUILD_AFLAGS	+= $(KBUILD_CFLAGS)
75LDFLAGS		+= $(ldflags-y)
76
77head-y		:= arch/arc/kernel/head.o
78
79# See arch/arc/Kbuild for content of core part of the kernel
80core-y		+= arch/arc/
81
82# w/o this dtb won't embed into kernel binary
83core-y		+= arch/arc/boot/dts/
84
85core-$(CONFIG_ARC_PLAT_FPGA_LEGACY)	+= arch/arc/plat-arcfpga/
86core-$(CONFIG_ARC_PLAT_TB10X)		+= arch/arc/plat-tb10x/
87
88drivers-$(CONFIG_OPROFILE)	+= arch/arc/oprofile/
89
90libs-y		+= arch/arc/lib/ $(LIBGCC)
91
92boot		:= arch/arc/boot
93
94#default target for make without any arguements.
95KBUILD_IMAGE	:= bootpImage
96
97all:	$(KBUILD_IMAGE)
98bootpImage: vmlinux
99
100boot_targets += uImage uImage.bin uImage.gz
101
102$(boot_targets): vmlinux
103	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
104
105%.dtb %.dtb.S %.dtb.o: scripts
106	$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
107
108dtbs: scripts
109	$(Q)$(MAKE) $(build)=$(boot)/dts dtbs
110
111archclean:
112	$(Q)$(MAKE) $(clean)=$(boot)
113
114# Hacks to enable final link due to absence of link-time branch relexation
115# and gcc choosing optimal(shorter) branches at -O3
116#
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
121export CFLAGS_decompress_inflate.o = -mmedium-calls
122export CFLAGS_initramfs.o = -mmedium-calls
123ifdef CONFIG_SMP
124export CFLAGS_core.o = -mmedium-calls
125endif
126