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 filechk_gen_header = $<
  27
  28 core-y                  += $(ARCH_DIR)/kernel/          \
  29                            $(ARCH_DIR)/drivers/         \
  30                            $(ARCH_DIR)/os-$(OS)/
  31
  32 MODE_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
  33
  34 HEADER_ARCH     := $(SUBARCH)
  35
  36 ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
  37         HEADER_ARCH := x86
  38 endif
  39
  40 ifdef CONFIG_64BIT
  41         KBUILD_CFLAGS += -mcmodel=large
  42 endif
  43
  44 HOST_DIR := arch/$(HEADER_ARCH)
  45
  46 include $(ARCH_DIR)/Makefile-skas
  47 include $(HOST_DIR)/Makefile.um
  48
  49 core-y += $(HOST_DIR)/um/
  50
  51 SHARED_HEADERS  := $(ARCH_DIR)/include/shared
  52 ARCH_INCLUDE    := -I$(srctree)/$(SHARED_HEADERS)
  53 ARCH_INCLUDE    += -I$(srctree)/$(HOST_DIR)/um/shared
  54 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
  55
  56 # -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
  57 # named - it's a common symbol in libpcap, so we get a binary which crashes.
  58 #
  59 # Same things for in6addr_loopback and mktime - found in libc. For these two we
  60 # only get link-time error, luckily.
  61 #
  62 # These apply to USER_CFLAGS to.
  63
  64 KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
  65         $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap      \
  66         -Din6addr_loopback=kernel_in6addr_loopback \
  67         -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
  68
  69 KBUILD_AFLAGS += $(ARCH_INCLUDE)
  70
  71 USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -D__KERNEL__,,\
  72         $(patsubst -I%,,$(KBUILD_CFLAGS)))) $(ARCH_INCLUDE) $(MODE_INCLUDE) \
  73         $(filter -I%,$(CFLAGS)) -D_FILE_OFFSET_BITS=64 -idirafter include
  74
  75 #This will adjust *FLAGS accordingly to the platform.
  76 include $(ARCH_DIR)/Makefile-os-$(OS)
  77
  78 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
  79                    -I$(srctree)/$(HOST_DIR)/include/uapi \
  80                    -I$(HOST_DIR)/include/generated \
  81                    -I$(HOST_DIR)/include/generated/uapi
  82
  83 # -Derrno=kernel_errno - This turns all kernel references to errno into
  84 # kernel_errno to separate them from the libc errno.  This allows -fno-common
  85 # in KBUILD_CFLAGS.  Otherwise, it would cause ld to complain about the two different
  86 # errnos.
  87 # These apply to kernelspace only.
  88 #
  89 # strip leading and trailing whitespace to make the USER_CFLAGS removal of these
  90 # defines more robust
  91
  92 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
  93                          -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
  94 KBUILD_CFLAGS += $(KERNEL_DEFINES)
  95
  96 PHONY += linux
  97
  98 all: linux
  99
 100 linux: vmlinux
 101         @echo '  LINK $@'
 102         $(Q)ln -f $< $@
 103
 104 define archhelp
 105   echo '* linux         - Binary kernel image (./linux) - for backward'
 106   echo '                   compatibility only, this creates a hard link to the'
 107   echo '                   real kernel binary, the "vmlinux" binary you'
 108   echo '                   find in the kernel root.'
 109 endef
 110
 111 KBUILD_KCONFIG := $(HOST_DIR)/um/Kconfig
 112
 113 archheaders:
 114         $(Q)$(MAKE) KBUILD_SRC= ARCH=$(HEADER_ARCH) archheaders
 115
 116 archprepare: include/generated/user_constants.h
 117
 118 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
 119 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
 120
 121 CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
 122         $(call cc-option, -fno-stack-protector,) \
 123         $(call cc-option, -fno-stack-protector-all,)
 124
 125 # Options used by linker script
 126 export LDS_START      := $(START)
 127 export LDS_ELF_ARCH   := $(ELF_ARCH)
 128 export LDS_ELF_FORMAT := $(ELF_FORMAT)
 129
 130 # The wrappers will select whether using "malloc" or the kernel allocator.
 131 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
 132
 133 LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
 134
 135 # Used by link-vmlinux.sh which has special support for um link
 136 export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
 137
 138 # When cleaning we don't include .config, so we don't include
 139 # TT or skas makefiles and don't clean skas_ptregs.h.
 140 CLEAN_FILES += linux x.i gmon.out
 141
 142 archclean:
 143         @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
 144                 -o -name '*.gcov' \) -type f -print | xargs rm -f
 145
 146 # Generated files
 147
 148 $(HOST_DIR)/um/user-offsets.s: __headers FORCE
 149         $(Q)$(MAKE) $(build)=$(HOST_DIR)/um $@
 150
 151 define filechk_gen-asm-offsets
 152         (set -e; \
 153          echo "/*"; \
 154          echo " * DO NOT MODIFY."; \
 155          echo " *"; \
 156          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 157          echo " *"; \
 158          echo " */"; \
 159          echo ""; \
 160          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 161          echo ""; )
 162 endef
 163
 164 include/generated/user_constants.h: $(HOST_DIR)/um/user-offsets.s
 165         $(call filechk,gen-asm-offsets)
 166
 167 export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH