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 KBUILD_DEFCONFIG := fpga_defconfig
  12
  13 cflags-y        += -mA7 -fno-common -pipe -fno-builtin -D__linux__
  14
  15 LINUXINCLUDE    +=  -include ${src}/arch/arc/include/asm/defines.h
  16
  17 ifdef CONFIG_ARC_CURR_IN_REG
  18 # For a global register defintion, make sure it gets passed to every file
  19 # We had a customer reported bug where some code built in kernel was NOT using
  20 # any kernel headers, and missing the r25 global register
  21 # Can't do unconditionally (like above) because of recursive include issues
  22 # due to <linux/thread_info.h>
  23 LINUXINCLUDE    +=  -include ${src}/arch/arc/include/asm/current.h
  24 endif
  25
  26 atleast_gcc44 :=  $(call cc-ifversion, -gt, 0402, y)
  27 cflags-$(atleast_gcc44)                 += -fsection-anchors
  28
  29 cflags-$(CONFIG_ARC_HAS_LLSC)           += -mlock
  30 cflags-$(CONFIG_ARC_HAS_SWAPE)          += -mswape
  31 cflags-$(CONFIG_ARC_HAS_RTSC)           += -mrtsc
  32 cflags-$(CONFIG_ARC_DW2_UNWIND)         += -fasynchronous-unwind-tables
  33
  34 ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
  35 # Generic build system uses -O2, we want -O3
  36 cflags-y  += -O3
  37 endif
  38
  39 # small data is default for elf32 tool-chain. If not usable, disable it
  40 # This also allows repurposing GP as scratch reg to gcc reg allocator
  41 disable_small_data := y
  42 cflags-$(disable_small_data)            += -mno-sdata -fcall-used-gp
  43
  44 cflags-$(CONFIG_CPU_BIG_ENDIAN)         += -mbig-endian
  45 ldflags-$(CONFIG_CPU_BIG_ENDIAN)        += -EB
  46
  47 # STAR 9000518362:
  48 # arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
  49 # --build-id w/o "-marclinux".
  50 # Default arc-elf32-ld is OK
  51 ldflags-y                               += -marclinux
  52
  53 ARC_LIBGCC                              := -mA7
  54 cflags-$(CONFIG_ARC_HAS_HW_MPY)         += -multcost=16
  55
  56 ifndef CONFIG_ARC_HAS_HW_MPY
  57         cflags-y        += -mno-mpy
  58
  59 # newlib for ARC700 assumes MPY to be always present, which is generally true
  60 # However, if someone really doesn't want MPY, we need to use the 600 ver
  61 # which coupled with -mno-mpy will use mpy emulation
  62 # With gcc 4.4.7, -mno-mpy is enough to make any other related adjustments,
  63 # e.g. increased cost of MPY. With gcc 4.2.1 this had to be explicitly hinted
  64
  65         ARC_LIBGCC              := -marc600
  66         ifneq ($(atleast_gcc44),y)
  67                 cflags-y        += -multcost=30
  68         endif
  69 endif
  70
  71 LIBGCC  := $(shell $(CC) $(ARC_LIBGCC) $(cflags-y) --print-libgcc-file-name)
  72
  73 # Modules with short calls might break for calls into builtin-kernel
  74 KBUILD_CFLAGS_MODULE    += -mlong-calls
  75
  76 # Finally dump eveything into kernel build system
  77 KBUILD_CFLAGS   += $(cflags-y)
  78 KBUILD_AFLAGS   += $(KBUILD_CFLAGS)
  79 LDFLAGS         += $(ldflags-y)
  80
  81 head-y          := arch/arc/kernel/head.o
  82
  83 # See arch/arc/Kbuild for content of core part of the kernel
  84 core-y          += arch/arc/
  85
  86 # w/o this dtb won't embed into kernel binary
  87 core-y          += arch/arc/boot/dts/
  88
  89 core-$(CONFIG_ARC_PLAT_FPGA_LEGACY)     += arch/arc/plat-arcfpga/
  90
  91 drivers-$(CONFIG_OPROFILE)      += arch/arc/oprofile/
  92
  93 libs-y          += arch/arc/lib/ $(LIBGCC)
  94
  95 #default target for make without any arguements.
  96 KBUILD_IMAGE := bootpImage
  97
  98 all:    $(KBUILD_IMAGE)
  99 boot    := arch/arc/boot
 100
 101 bootpImage: vmlinux
 102
 103 uImage: vmlinux
 104         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 105
 106 %.dtb %.dtb.S %.dtb.o: scripts
 107         $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
 108
 109 dtbs: scripts
 110         $(Q)$(MAKE) $(build)=$(boot)/dts dtbs
 111
 112 archclean:
 113         $(Q)$(MAKE) $(clean)=$(boot)
 114
 115 # Hacks to enable final link due to absence of link-time branch relexation
 116 # and gcc choosing optimal(shorter) branches at -O3
 117 #
 118 # vineetg Feb 2010: -mlong-calls switched off for overall kernel build
 119 # However lib/decompress_inflate.o (.init.text) calls
 120 # zlib_inflate_workspacesize (.text) causing relocation errors.
 121 # Thus forcing all exten calls in this file to be long calls
 122 export CFLAGS_decompress_inflate.o = -mmedium-calls
 123 export CFLAGS_initramfs.o = -mmedium-calls
 124 ifdef CONFIG_SMP
 125 export CFLAGS_core.o = -mmedium-calls
 126 endif