arch/arc/Makefile

   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 CROSS_COMPILE := arc-linux-uclibc-
  13 endif
  14
  15 KBUILD_DEFCONFIG := fpga_defconfig
  16
  17 cflags-y        += -mA7 -fno-common -pipe -fno-builtin -D__linux__
  18
  19 ifdef 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>
  25 LINUXINCLUDE    +=  -include ${src}/arch/arc/include/asm/current.h
  26 endif
  27
  28 upto_gcc42    :=  $(call cc-ifversion, -le, 0402, y)
  29 upto_gcc44    :=  $(call cc-ifversion, -le, 0404, y)
  30 atleast_gcc44 :=  $(call cc-ifversion, -ge, 0404, y)
  31 atleast_gcc48 :=  $(call cc-ifversion, -ge, 0408, y)
  32
  33 cflags-$(atleast_gcc44)                 += -fsection-anchors
  34
  35 cflags-$(CONFIG_ARC_HAS_LLSC)           += -mlock
  36 cflags-$(CONFIG_ARC_HAS_SWAPE)          += -mswape
  37 cflags-$(CONFIG_ARC_HAS_RTSC)           += -mrtsc
  38 cflags-$(CONFIG_ARC_DW2_UNWIND)         += -fasynchronous-unwind-tables
  39
  40 # By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok
  41 ifeq ($(atleast_gcc48),y)
  42 cflags-$(CONFIG_ARC_DW2_UNWIND)         += -gdwarf-2
  43 endif
  44
  45 ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
  46 # Generic build system uses -O2, we want -O3
  47 cflags-y  += -O3
  48 endif
  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
  52 disable_small_data := y
  53 cflags-$(disable_small_data)            += -mno-sdata -fcall-used-gp
  54
  55 cflags-$(CONFIG_CPU_BIG_ENDIAN)         += -mbig-endian
  56 ldflags-$(CONFIG_CPU_BIG_ENDIAN)        += -EB
  57
  58 # STAR 9000518362: (fixed with binutils shipping with gcc 4.8)
  59 # arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
  60 # --build-id w/o "-marclinux". Default arc-elf32-ld is OK
  61 ldflags-$(upto_gcc44)                   += -marclinux
  62
  63 ARC_LIBGCC                              := -mA7
  64 cflags-$(CONFIG_ARC_HAS_HW_MPY)         += -multcost=16
  65
  66 ifndef CONFIG_ARC_HAS_HW_MPY
  67         cflags-y        += -mno-mpy
  68
  69 # newlib for ARC700 assumes MPY to be always present, which is generally true
  70 # However, if someone really doesn't want MPY, we need to use the 600 ver
  71 # which coupled with -mno-mpy will use mpy emulation
  72 # With gcc 4.4.7, -mno-mpy is enough to make any other related adjustments,
  73 # e.g. increased cost of MPY. With gcc 4.2.1 this had to be explicitly hinted
  74
  75         ifeq ($(upto_gcc42),y)
  76                 ARC_LIBGCC      := -marc600
  77                 cflags-y        += -multcost=30
  78         endif
  79 endif
  80
  81 LIBGCC  := $(shell $(CC) $(ARC_LIBGCC) $(cflags-y) --print-libgcc-file-name)
  82
  83 # Modules with short calls might break for calls into builtin-kernel
  84 KBUILD_CFLAGS_MODULE    += -mlong-calls
  85
  86 # Finally dump eveything into kernel build system
  87 KBUILD_CFLAGS   += $(cflags-y)
  88 KBUILD_AFLAGS   += $(KBUILD_CFLAGS)
  89 LDFLAGS         += $(ldflags-y)
  90
  91 head-y          := arch/arc/kernel/head.o
  92
  93 # See arch/arc/Kbuild for content of core part of the kernel
  94 core-y          += arch/arc/
  95
  96 # w/o this dtb won't embed into kernel binary
  97 core-y          += arch/arc/boot/dts/
  98
  99 core-$(CONFIG_ARC_PLAT_FPGA_LEGACY)     += arch/arc/plat-arcfpga/
 100 core-$(CONFIG_ARC_PLAT_TB10X)           += arch/arc/plat-tb10x/
 101
 102 drivers-$(CONFIG_OPROFILE)      += arch/arc/oprofile/
 103
 104 libs-y          += arch/arc/lib/ $(LIBGCC)
 105
 106 boot            := arch/arc/boot
 107
 108 #default target for make without any arguements.
 109 KBUILD_IMAGE    := bootpImage
 110
 111 all:    $(KBUILD_IMAGE)
 112 bootpImage: vmlinux
 113
 114 boot_targets += uImage uImage.bin uImage.gz
 115
 116 $(boot_targets): vmlinux
 117         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 118
 119 %.dtb %.dtb.S %.dtb.o: scripts
 120         $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
 121
 122 dtbs: scripts
 123         $(Q)$(MAKE) $(build)=$(boot)/dts dtbs
 124
 125 archclean:
 126         $(Q)$(MAKE) $(clean)=$(boot)
 127
 128 # Hacks to enable final link due to absence of link-time branch relexation
 129 # and gcc choosing optimal(shorter) branches at -O3
 130 #
 131 # vineetg Feb 2010: -mlong-calls switched off for overall kernel build
 132 # However lib/decompress_inflate.o (.init.text) calls
 133 # zlib_inflate_workspacesize (.text) causing relocation errors.
 134 # Thus forcing all exten calls in this file to be long calls
 135 export CFLAGS_decompress_inflate.o = -mmedium-calls
 136 export CFLAGS_initramfs.o = -mmedium-calls
 137 ifdef CONFIG_SMP
 138 export CFLAGS_core.o = -mmedium-calls
 139 endif