Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 ($(CROSS_COMPILE),)
12CROSS_COMPILE := arc-linux-
13endif
14
15KBUILD_DEFCONFIG := nsim_700_defconfig
16
17cflags-y += -fno-common -pipe -fno-builtin -D__linux__
18cflags-$(CONFIG_ISA_ARCOMPACT) += -mA7
19cflags-$(CONFIG_ISA_ARCV2) += -mcpu=archs
20
21ifdef 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>
27LINUXINCLUDE += -include ${src}/arch/arc/include/asm/current.h
28endif
29
30upto_gcc44 := $(call cc-ifversion, -le, 0404, y)
31atleast_gcc44 := $(call cc-ifversion, -ge, 0404, y)
32atleast_gcc48 := $(call cc-ifversion, -ge, 0408, y)
33
34cflags-$(atleast_gcc44) += -fsection-anchors
35
36cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock
37cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape
38
39ifdef CONFIG_ISA_ARCV2
40
41ifndef CONFIG_ARC_HAS_LL64
42cflags-y += -mno-ll64
43endif
44
45ifndef CONFIG_ARC_HAS_DIV_REM
46cflags-y += -mno-div-rem
47endif
48
49endif
50
51cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables
52
53# By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok
54ifeq ($(atleast_gcc48),y)
55cflags-$(CONFIG_ARC_DW2_UNWIND) += -gdwarf-2
56endif
57
58ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
59# Generic build system uses -O2, we want -O3
60# Note: No need to add to cflags-y as that happens anyways
61ARCH_CFLAGS += -O3
62endif
63
64# small data is default for elf32 tool-chain. If not usable, disable it
65# This also allows repurposing GP as scratch reg to gcc reg allocator
66disable_small_data := y
67cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp
68
69cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian
70ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
71
72# STAR 9000518362: (fixed with binutils shipping with gcc 4.8)
73# arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
74# --build-id w/o "-marclinux". Default arc-elf32-ld is OK
75ldflags-$(upto_gcc44) += -marclinux
76
77ifndef CONFIG_ARC_HAS_HW_MPY
78 cflags-y += -mno-mpy
79endif
80
81LIBGCC := $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
82
83# Modules with short calls might break for calls into builtin-kernel
84KBUILD_CFLAGS_MODULE += -mlong-calls
85
86# Finally dump eveything into kernel build system
87KBUILD_CFLAGS += $(cflags-y)
88KBUILD_AFLAGS += $(KBUILD_CFLAGS)
89LDFLAGS += $(ldflags-y)
90
91head-y := arch/arc/kernel/head.o
92
93# See arch/arc/Kbuild for content of core part of the kernel
94core-y += arch/arc/
95
96# w/o this dtb won't embed into kernel binary
97core-y += arch/arc/boot/dts/
98
99core-$(CONFIG_ARC_PLAT_SIM) += arch/arc/plat-sim/
100core-$(CONFIG_ARC_PLAT_TB10X) += arch/arc/plat-tb10x/
101core-$(CONFIG_ARC_PLAT_AXS10X) += arch/arc/plat-axs10x/
102
103drivers-$(CONFIG_OPROFILE) += arch/arc/oprofile/
104
105libs-y += arch/arc/lib/ $(LIBGCC)
106
107boot := arch/arc/boot
108
109#default target for make without any arguements.
110KBUILD_IMAGE := bootpImage
111
112all: $(KBUILD_IMAGE)
113bootpImage: vmlinux
114
115boot_targets += uImage uImage.bin uImage.gz
116
117$(boot_targets): vmlinux
118 $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
119
120%.dtb %.dtb.S %.dtb.o: scripts
121 $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
122
123dtbs: scripts
124 $(Q)$(MAKE) $(build)=$(boot)/dts dtbs
125
126archclean:
127 $(Q)$(MAKE) $(clean)=$(boot)
128
129# Hacks to enable final link due to absence of link-time branch relexation
130# and gcc choosing optimal(shorter) branches at -O3
131#
132# vineetg Feb 2010: -mlong-calls switched off for overall kernel build
133# However lib/decompress_inflate.o (.init.text) calls
134# zlib_inflate_workspacesize (.text) causing relocation errors.
135# Thus forcing all exten calls in this file to be long calls
136export CFLAGS_decompress_inflate.o = -mmedium-calls
137export CFLAGS_initramfs.o = -mmedium-calls
138ifdef CONFIG_SMP
139export CFLAGS_core.o = -mmedium-calls
140endif