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 ($(CROSS_COMPILE),)
12 CROSS_COMPILE := arc-linux-
15 KBUILD_DEFCONFIG := nsim_700_defconfig
17 cflags-y += -fno-common -pipe -fno-builtin -D__linux__
18 cflags-$(CONFIG_ISA_ARCOMPACT) += -mA7
19 cflags-$(CONFIG_ISA_ARCV2) += -mcpu=archs
21 is_700 = $(shell $(CC) -dM -E - < /dev/null | grep -q "ARC700" && echo 1 || echo 0)
23 ifdef CONFIG_ISA_ARCOMPACT
25 $(error Toolchain not configured for ARCompact builds)
29 ifdef CONFIG_ISA_ARCV2
31 $(error Toolchain not configured for ARCv2 builds)
35 ifdef CONFIG_ARC_CURR_IN_REG
36 # For a global register defintion, make sure it gets passed to every file
37 # We had a customer reported bug where some code built in kernel was NOT using
38 # any kernel headers, and missing the r25 global register
39 # Can't do unconditionally because of recursive include issues
40 # due to <linux/thread_info.h>
41 LINUXINCLUDE += -include ${src}/arch/arc/include/asm/current.h
44 upto_gcc44 := $(call cc-ifversion, -le, 0404, y)
45 atleast_gcc44 := $(call cc-ifversion, -ge, 0404, y)
46 atleast_gcc48 := $(call cc-ifversion, -ge, 0408, y)
48 cflags-$(atleast_gcc44) += -fsection-anchors
50 cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock
51 cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape
53 ifdef CONFIG_ISA_ARCV2
55 ifndef CONFIG_ARC_HAS_LL64
59 ifndef CONFIG_ARC_HAS_DIV_REM
60 cflags-y += -mno-div-rem
65 # By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok
66 ifeq ($(atleast_gcc48),y)
67 cflags-$(CONFIG_ARC_DW2_UNWIND) += -gdwarf-2
70 ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
71 # Generic build system uses -O2, we want -O3
72 # Note: No need to add to cflags-y as that happens anyways
76 # small data is default for elf32 tool-chain. If not usable, disable it
77 # This also allows repurposing GP as scratch reg to gcc reg allocator
78 disable_small_data := y
79 cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp
81 cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian
82 ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
84 # STAR 9000518362: (fixed with binutils shipping with gcc 4.8)
85 # arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
86 # --build-id w/o "-marclinux". Default arc-elf32-ld is OK
87 ldflags-$(upto_gcc44) += -marclinux
89 ifndef CONFIG_ARC_HAS_HW_MPY
93 LIBGCC := $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
95 # Modules with short calls might break for calls into builtin-kernel
96 KBUILD_CFLAGS_MODULE += -mlong-calls -mno-millicode
98 # Finally dump eveything into kernel build system
99 KBUILD_CFLAGS += $(cflags-y)
100 KBUILD_AFLAGS += $(KBUILD_CFLAGS)
101 LDFLAGS += $(ldflags-y)
103 head-y := arch/arc/kernel/head.o
105 # See arch/arc/Kbuild for content of core part of the kernel
108 # w/o this dtb won't embed into kernel binary
109 core-y += arch/arc/boot/dts/
111 core-$(CONFIG_ARC_PLAT_SIM) += arch/arc/plat-sim/
112 core-$(CONFIG_ARC_PLAT_TB10X) += arch/arc/plat-tb10x/
113 core-$(CONFIG_ARC_PLAT_AXS10X) += arch/arc/plat-axs10x/
115 drivers-$(CONFIG_OPROFILE) += arch/arc/oprofile/
117 libs-y += arch/arc/lib/ $(LIBGCC)
119 boot := arch/arc/boot
121 #default target for make without any arguements.
122 KBUILD_IMAGE := bootpImage
127 boot_targets += uImage uImage.bin uImage.gz
129 $(boot_targets): vmlinux
130 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
132 %.dtb %.dtb.S %.dtb.o: scripts
133 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
136 $(Q)$(MAKE) $(build)=$(boot)/dts
139 $(Q)$(MAKE) $(clean)=$(boot)
141 # Hacks to enable final link due to absence of link-time branch relexation
142 # and gcc choosing optimal(shorter) branches at -O3
144 # vineetg Feb 2010: -mlong-calls switched off for overall kernel build
145 # However lib/decompress_inflate.o (.init.text) calls
146 # zlib_inflate_workspacesize (.text) causing relocation errors.
147 # Thus forcing all exten calls in this file to be long calls
148 export CFLAGS_decompress_inflate.o = -mmedium-calls
149 export CFLAGS_initramfs.o = -mmedium-calls
151 export CFLAGS_core.o = -mmedium-calls