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-elf32-
  13 endif
  14
  15 KBUILD_DEFCONFIG := fpga_defconfig
  16
  17 cflags-y        += -mA7 -fno-common -pipe -fno-builtin -D__linux__
  18
  19 LINUXINCLUDE    +=  -include ${src}/arch/arc/include/asm/defines.h
  20
  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 (like above) because of recursive include issues
  26 # due to <linux/thread_info.h>
  27 LINUXINCLUDE    +=  -include ${src}/arch/arc/include/asm/current.h
  28 endif
  29
  30 atleast_gcc44 :=  $(call cc-ifversion, -gt, 0402, y)
  31 cflags-$(atleast_gcc44)                 += -fsection-anchors
  32
  33 cflags-$(CONFIG_ARC_HAS_LLSC)           += -mlock
  34 cflags-$(CONFIG_ARC_HAS_SWAPE)          += -mswape
  35 cflags-$(CONFIG_ARC_HAS_RTSC)           += -mrtsc
  36 cflags-$(CONFIG_ARC_DW2_UNWIND)         += -fasynchronous-unwind-tables
  37
  38 ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
  39 # Generic build system uses -O2, we want -O3
  40 cflags-y  += -O3
  41 endif
  42
  43 # small data is default for elf32 tool-chain. If not usable, disable it
  44 # This also allows repurposing GP as scratch reg to gcc reg allocator
  45 disable_small_data := y
  46 cflags-$(disable_small_data)            += -mno-sdata -fcall-used-gp
  47
  48 cflags-$(CONFIG_CPU_BIG_ENDIAN)         += -mbig-endian
  49 ldflags-$(CONFIG_CPU_BIG_ENDIAN)        += -EB
  50
  51 # STAR 9000518362:
  52 # arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
  53 # --build-id w/o "-marclinux".
  54 # Default arc-elf32-ld is OK
  55 ldflags-y                               += -marclinux
  56
  57 ARC_LIBGCC                              := -mA7
  58 cflags-$(CONFIG_ARC_HAS_HW_MPY)         += -multcost=16
  59
  60 ifndef CONFIG_ARC_HAS_HW_MPY
  61         cflags-y        += -mno-mpy
  62
  63 # newlib for ARC700 assumes MPY to be always present, which is generally true
  64 # However, if someone really doesn't want MPY, we need to use the 600 ver
  65 # which coupled with -mno-mpy will use mpy emulation
  66 # With gcc 4.4.7, -mno-mpy is enough to make any other related adjustments,
  67 # e.g. increased cost of MPY. With gcc 4.2.1 this had to be explicitly hinted
  68
  69         ARC_LIBGCC              := -marc600
  70         ifneq ($(atleast_gcc44),y)
  71                 cflags-y        += -multcost=30
  72         endif
  73 endif
  74
  75 LIBGCC  := $(shell $(CC) $(ARC_LIBGCC) $(cflags-y) --print-libgcc-file-name)
  76
  77 # Modules with short calls might break for calls into builtin-kernel
  78 KBUILD_CFLAGS_MODULE    += -mlong-calls
  79
  80 # Finally dump eveything into kernel build system
  81 KBUILD_CFLAGS   += $(cflags-y)
  82 KBUILD_AFLAGS   += $(KBUILD_CFLAGS)
  83 LDFLAGS         += $(ldflags-y)
  84
  85 head-y          := arch/arc/kernel/head.o
  86
  87 # See arch/arc/Kbuild for content of core part of the kernel
  88 core-y          += arch/arc/
  89
  90 # w/o this dtb won't embed into kernel binary
  91 core-y          += arch/arc/boot/dts/
  92
  93 core-$(CONFIG_ARC_PLAT_FPGA_LEGACY)     += arch/arc/plat-arcfpga/
  94 core-$(CONFIG_ARC_PLAT_TB10X)           += arch/arc/plat-tb10x/
  95
  96 drivers-$(CONFIG_OPROFILE)      += arch/arc/oprofile/
  97
  98 libs-y          += arch/arc/lib/ $(LIBGCC)
  99
 100 boot            := arch/arc/boot
 101
 102 #default target for make without any arguements.
 103 KBUILD_IMAGE    := bootpImage
 104
 105 all:    $(KBUILD_IMAGE)
 106 bootpImage: vmlinux
 107
 108 boot_targets += uImage uImage.bin uImage.gz
 109
 110 $(boot_targets): vmlinux
 111         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 112
 113 %.dtb %.dtb.S %.dtb.o: scripts
 114         $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
 115
 116 dtbs: scripts
 117         $(Q)$(MAKE) $(build)=$(boot)/dts dtbs
 118
 119 archclean:
 120         $(Q)$(MAKE) $(clean)=$(boot)
 121
 122 # Hacks to enable final link due to absence of link-time branch relexation
 123 # and gcc choosing optimal(shorter) branches at -O3
 124 #
 125 # vineetg Feb 2010: -mlong-calls switched off for overall kernel build
 126 # However lib/decompress_inflate.o (.init.text) calls
 127 # zlib_inflate_workspacesize (.text) causing relocation errors.
 128 # Thus forcing all exten calls in this file to be long calls
 129 export CFLAGS_decompress_inflate.o = -mmedium-calls
 130 export CFLAGS_initramfs.o = -mmedium-calls
 131 ifdef CONFIG_SMP
 132 export CFLAGS_core.o = -mmedium-calls
 133 endif