arch/um/Makefile

   1 #
   2 # This file is included by the global makefile so that you can add your own
   3 # architecture-specific flags and dependencies.
   4 #
   5 # Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   6 # Licensed under the GPL
   7 #
   8
   9 # select defconfig based on actual architecture
  10 ifeq ($(SUBARCH),x86)
  11   ifeq ($(shell uname -m),x86_64)
  12         KBUILD_DEFCONFIG := x86_64_defconfig
  13   else
  14         KBUILD_DEFCONFIG := i386_defconfig
  15   endif
  16 else
  17         KBUILD_DEFCONFIG := $(SUBARCH)_defconfig
  18 endif
  19
  20 ARCH_DIR := arch/um
  21 OS := $(shell uname -s)
  22 # We require bash because the vmlinux link and loader script cpp use bash
  23 # features.
  24 SHELL := /bin/bash
  25
  26 core-y                  += $(ARCH_DIR)/kernel/          \
  27                            $(ARCH_DIR)/drivers/         \
  28                            $(ARCH_DIR)/os-$(OS)/
  29
  30 MODE_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
  31
  32 HEADER_ARCH     := $(SUBARCH)
  33
  34 ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
  35         HEADER_ARCH := x86
  36 endif
  37
  38 ifdef CONFIG_64BIT
  39         KBUILD_CFLAGS += -mcmodel=large
  40 endif
  41
  42 HOST_DIR := arch/$(HEADER_ARCH)
  43
  44 include $(ARCH_DIR)/Makefile-skas
  45 include $(HOST_DIR)/Makefile.um
  46
  47 core-y += $(HOST_DIR)/um/
  48
  49 SHARED_HEADERS  := $(ARCH_DIR)/include/shared
  50 ARCH_INCLUDE    := -I$(srctree)/$(SHARED_HEADERS)
  51 ARCH_INCLUDE    += -I$(srctree)/$(HOST_DIR)/um/shared
  52 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
  53
  54 # -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
  55 # named - it's a common symbol in libpcap, so we get a binary which crashes.
  56 #
  57 # Same things for in6addr_loopback and mktime - found in libc. For these two we
  58 # only get link-time error, luckily.
  59 #
  60 # -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
  61 # embedded copy of longjmp, same thing for setjmp.
  62 #
  63 # These apply to USER_CFLAGS to.
  64
  65 KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
  66         $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap      \
  67         -Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
  68         -Din6addr_loopback=kernel_in6addr_loopback \
  69         -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
  70
  71 KBUILD_AFLAGS += $(ARCH_INCLUDE)
  72
  73 USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
  74                 $(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \
  75                 -D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \
  76                 -idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__
  77
  78 #This will adjust *FLAGS accordingly to the platform.
  79 include $(ARCH_DIR)/Makefile-os-$(OS)
  80
  81 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
  82                    -I$(srctree)/$(HOST_DIR)/include/uapi \
  83                    -I$(objtree)/$(HOST_DIR)/include/generated \
  84                    -I$(objtree)/$(HOST_DIR)/include/generated/uapi
  85
  86 # -Derrno=kernel_errno - This turns all kernel references to errno into
  87 # kernel_errno to separate them from the libc errno.  This allows -fno-common
  88 # in KBUILD_CFLAGS.  Otherwise, it would cause ld to complain about the two different
  89 # errnos.
  90 # These apply to kernelspace only.
  91 #
  92 # strip leading and trailing whitespace to make the USER_CFLAGS removal of these
  93 # defines more robust
  94
  95 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
  96                          -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
  97 KBUILD_CFLAGS += $(KERNEL_DEFINES)
  98
  99 PHONY += linux
 100
 101 all: linux
 102
 103 linux: vmlinux
 104         @echo '  LINK $@'
 105         $(Q)ln -f $< $@
 106
 107 define archhelp
 108   echo '* linux         - Binary kernel image (./linux) - for backward'
 109   echo '                   compatibility only, this creates a hard link to the'
 110   echo '                   real kernel binary, the "vmlinux" binary you'
 111   echo '                   find in the kernel root.'
 112 endef
 113
 114 archheaders:
 115         $(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders
 116
 117 archprepare:
 118         $(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h
 119
 120 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
 121 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib $(call cc-option, -no-pie)
 122
 123 CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
 124         $(call cc-option, -fno-stack-protector,) \
 125         $(call cc-option, -fno-stack-protector-all,)
 126
 127 # Options used by linker script
 128 export LDS_START      := $(START)
 129 export LDS_ELF_ARCH   := $(ELF_ARCH)
 130 export LDS_ELF_FORMAT := $(ELF_FORMAT)
 131
 132 # The wrappers will select whether using "malloc" or the kernel allocator.
 133 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
 134
 135 LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS),-Wl,$(opt))
 136
 137 # Used by link-vmlinux.sh which has special support for um link
 138 export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
 139
 140 # When cleaning we don't include .config, so we don't include
 141 # TT or skas makefiles and don't clean skas_ptregs.h.
 142 CLEAN_FILES += linux x.i gmon.out
 143
 144 archclean:
 145         @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
 146                 -o -name '*.gcov' \) -type f -print | xargs rm -f
 147
 148 export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH