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Linux/arch/arc/Makefile

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  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 
  9 UTS_MACHINE := arc
 10 
 11 ifeq ($(CROSS_COMPILE),)
 12 ifndef CONFIG_CPU_BIG_ENDIAN
 13 CROSS_COMPILE := arc-linux-
 14 else
 15 CROSS_COMPILE := arceb-linux-
 16 endif
 17 endif
 18 
 19 KBUILD_DEFCONFIG := nsim_700_defconfig
 20 
 21 cflags-y        += -fno-common -pipe -fno-builtin -D__linux__
 22 cflags-$(CONFIG_ISA_ARCOMPACT)  += -mA7
 23 cflags-$(CONFIG_ISA_ARCV2)      += -mcpu=archs
 24 
 25 is_700 = $(shell $(CC) -dM -E - < /dev/null | grep -q "ARC700" && echo 1 || echo 0)
 26 
 27 ifdef CONFIG_ISA_ARCOMPACT
 28 ifeq ($(is_700), 0)
 29     $(error Toolchain not configured for ARCompact builds)
 30 endif
 31 endif
 32 
 33 ifdef CONFIG_ISA_ARCV2
 34 ifeq ($(is_700), 1)
 35     $(error Toolchain not configured for ARCv2 builds)
 36 endif
 37 endif
 38 
 39 ifdef CONFIG_ARC_CURR_IN_REG
 40 # For a global register defintion, make sure it gets passed to every file
 41 # We had a customer reported bug where some code built in kernel was NOT using
 42 # any kernel headers, and missing the r25 global register
 43 # Can't do unconditionally because of recursive include issues
 44 # due to <linux/thread_info.h>
 45 LINUXINCLUDE    +=  -include ${src}/arch/arc/include/asm/current.h
 46 endif
 47 
 48 upto_gcc44    :=  $(call cc-ifversion, -le, 0404, y)
 49 atleast_gcc44 :=  $(call cc-ifversion, -ge, 0404, y)
 50 atleast_gcc48 :=  $(call cc-ifversion, -ge, 0408, y)
 51 
 52 cflags-$(atleast_gcc44)                 += -fsection-anchors
 53 
 54 cflags-$(CONFIG_ARC_HAS_LLSC)           += -mlock
 55 cflags-$(CONFIG_ARC_HAS_SWAPE)          += -mswape
 56 
 57 ifdef CONFIG_ISA_ARCV2
 58 
 59 ifndef CONFIG_ARC_HAS_LL64
 60 cflags-y                                += -mno-ll64
 61 endif
 62 
 63 ifndef CONFIG_ARC_HAS_DIV_REM
 64 cflags-y                                += -mno-div-rem
 65 endif
 66 
 67 endif
 68 
 69 # By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok
 70 ifeq ($(atleast_gcc48),y)
 71 cflags-$(CONFIG_ARC_DW2_UNWIND)         += -gdwarf-2
 72 endif
 73 
 74 ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
 75 # Generic build system uses -O2, we want -O3
 76 # Note: No need to add to cflags-y as that happens anyways
 77 #
 78 # Disable the false maybe-uninitialized warings gcc spits out at -O3
 79 ARCH_CFLAGS += -O3 $(call cc-disable-warning,maybe-uninitialized,)
 80 endif
 81 
 82 # small data is default for elf32 tool-chain. If not usable, disable it
 83 # This also allows repurposing GP as scratch reg to gcc reg allocator
 84 disable_small_data := y
 85 cflags-$(disable_small_data)            += -mno-sdata -fcall-used-gp
 86 
 87 cflags-$(CONFIG_CPU_BIG_ENDIAN)         += -mbig-endian
 88 ldflags-$(CONFIG_CPU_BIG_ENDIAN)        += -EB
 89 
 90 # STAR 9000518362: (fixed with binutils shipping with gcc 4.8)
 91 # arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
 92 # --build-id w/o "-marclinux". Default arc-elf32-ld is OK
 93 ldflags-$(upto_gcc44)                   += -marclinux
 94 
 95 LIBGCC  := $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
 96 
 97 # Modules with short calls might break for calls into builtin-kernel
 98 KBUILD_CFLAGS_MODULE    += -mlong-calls -mno-millicode
 99 
100 # Finally dump eveything into kernel build system
101 KBUILD_CFLAGS   += $(cflags-y)
102 KBUILD_AFLAGS   += $(KBUILD_CFLAGS)
103 LDFLAGS         += $(ldflags-y)
104 
105 head-y          := arch/arc/kernel/head.o
106 
107 # See arch/arc/Kbuild for content of core part of the kernel
108 core-y          += arch/arc/
109 
110 # w/o this dtb won't embed into kernel binary
111 core-y          += arch/arc/boot/dts/
112 
113 core-$(CONFIG_ARC_PLAT_SIM)     += arch/arc/plat-sim/
114 core-$(CONFIG_ARC_PLAT_TB10X)   += arch/arc/plat-tb10x/
115 core-$(CONFIG_ARC_PLAT_AXS10X)  += arch/arc/plat-axs10x/
116 
117 drivers-$(CONFIG_OPROFILE)      += arch/arc/oprofile/
118 
119 libs-y          += arch/arc/lib/ $(LIBGCC)
120 
121 boot            := arch/arc/boot
122 
123 #default target for make without any arguements.
124 KBUILD_IMAGE    := bootpImage
125 
126 all:    $(KBUILD_IMAGE)
127 bootpImage: vmlinux
128 
129 boot_targets += uImage uImage.bin uImage.gz
130 
131 $(boot_targets): vmlinux
132         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
133 
134 %.dtb %.dtb.S %.dtb.o: scripts
135         $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
136 
137 dtbs: scripts
138         $(Q)$(MAKE) $(build)=$(boot)/dts
139 
140 archclean:
141         $(Q)$(MAKE) $(clean)=$(boot)
142 
143 # Hacks to enable final link due to absence of link-time branch relexation
144 # and gcc choosing optimal(shorter) branches at -O3
145 #
146 # vineetg Feb 2010: -mlong-calls switched off for overall kernel build
147 # However lib/decompress_inflate.o (.init.text) calls
148 # zlib_inflate_workspacesize (.text) causing relocation errors.
149 # Thus forcing all exten calls in this file to be long calls
150 export CFLAGS_decompress_inflate.o = -mmedium-calls
151 export CFLAGS_initramfs.o = -mmedium-calls
152 ifdef CONFIG_SMP
153 export CFLAGS_core.o = -mmedium-calls
154 endif

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