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 ifdef 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 because of recursive include issues
26 # due to <linux/thread_info.h>
27 LINUXINCLUDE
+= -include ${src}/arch
/arc
/include/asm
/current.h
30 upto_gcc44
:= $(call cc-ifversion
, -le
, 0404, y
)
31 atleast_gcc44
:= $(call cc-ifversion
, -ge
, 0404, y
)
32 atleast_gcc48
:= $(call cc-ifversion
, -ge
, 0408, y
)
34 cflags-
$(atleast_gcc44
) += -fsection-anchors
36 cflags-
$(CONFIG_ARC_HAS_LLSC
) += -mlock
37 cflags-
$(CONFIG_ARC_HAS_SWAPE
) += -mswape
39 ifndef CONFIG_ARC_HAS_LL64
40 cflags-
$(CONFIG_ISA_ARCV2
) += -mno-ll64
43 cflags-
$(CONFIG_ARC_DW2_UNWIND
) += -fasynchronous-unwind-tables
45 # By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok
46 ifeq ($(atleast_gcc48
),y
)
47 cflags-
$(CONFIG_ARC_DW2_UNWIND
) += -gdwarf-2
50 ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
51 # Generic build system uses -O2, we want -O3
52 # Note: No need to add to cflags-y as that happens anyways
56 # small data is default for elf32 tool-chain. If not usable, disable it
57 # This also allows repurposing GP as scratch reg to gcc reg allocator
58 disable_small_data
:= y
59 cflags-
$(disable_small_data
) += -mno-sdata
-fcall-used-gp
61 cflags-
$(CONFIG_CPU_BIG_ENDIAN
) += -mbig-endian
62 ldflags-
$(CONFIG_CPU_BIG_ENDIAN
) += -EB
64 # STAR 9000518362: (fixed with binutils shipping with gcc 4.8)
65 # arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
66 # --build-id w/o "-marclinux". Default arc-elf32-ld is OK
67 ldflags-
$(upto_gcc44
) += -marclinux
69 ifndef CONFIG_ARC_HAS_HW_MPY
73 LIBGCC
:= $(shell $(CC
) $(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_SIM
) += arch
/arc
/plat-sim
/
92 core-
$(CONFIG_ARC_PLAT_TB10X
) += arch
/arc
/plat-tb10x
/
93 core-
$(CONFIG_ARC_PLAT_AXS10X
) += arch
/arc
/plat-axs10x
/
95 drivers-
$(CONFIG_OPROFILE
) += arch
/arc
/oprofile
/
97 libs-y
+= arch
/arc
/lib
/ $(LIBGCC
)
101 #default target for make without any arguements.
102 KBUILD_IMAGE
:= bootpImage
107 boot_targets
+= uImage uImage.bin uImage.gz
109 $(boot_targets
): vmlinux
110 $(Q
)$(MAKE
) $(build
)=$(boot
) $(boot
)/$@
112 %.dtb
%.dtb.S
%.dtb.o
: scripts
113 $(Q
)$(MAKE
) $(build
)=$(boot
)/dts
$(boot
)/dts
/$@
116 $(Q
)$(MAKE
) $(build
)=$(boot
)/dts dtbs
119 $(Q
)$(MAKE
) $(clean)=$(boot
)
121 # Hacks to enable final link due to absence of link-time branch relexation
122 # and gcc choosing optimal(shorter) branches at -O3
124 # vineetg Feb 2010: -mlong-calls switched off for overall kernel build
125 # However lib/decompress_inflate.o (.init.text) calls
126 # zlib_inflate_workspacesize (.text) causing relocation errors.
127 # Thus forcing all exten calls in this file to be long calls
128 export CFLAGS_decompress_inflate.o
= -mmedium-calls
129 export CFLAGS_initramfs.o
= -mmedium-calls
131 export CFLAGS_core.o
= -mmedium-calls