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 # -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
  63 # embedded copy of longjmp, same thing for setjmp.
  64 #
  65 # These apply to USER_CFLAGS to.
  66
  67 KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
  68         $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap      \
  69         -Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
  70         -Din6addr_loopback=kernel_in6addr_loopback \
  71         -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
  72
  73 KBUILD_AFLAGS += $(ARCH_INCLUDE)
  74
  75 USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
  76                 $(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \
  77                 -D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \
  78                 -idirafter $(obj)/include -D__KERNEL__ -D__UM_HOST__
  79
  80 #This will adjust *FLAGS accordingly to the platform.
  81 include $(ARCH_DIR)/Makefile-os-$(OS)
  82
  83 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
  84                    -I$(srctree)/$(HOST_DIR)/include/uapi \
  85                    -I$(objtree)/$(HOST_DIR)/include/generated \
  86                    -I$(objtree)/$(HOST_DIR)/include/generated/uapi
  87
  88 # -Derrno=kernel_errno - This turns all kernel references to errno into
  89 # kernel_errno to separate them from the libc errno.  This allows -fno-common
  90 # in KBUILD_CFLAGS.  Otherwise, it would cause ld to complain about the two different
  91 # errnos.
  92 # These apply to kernelspace only.
  93 #
  94 # strip leading and trailing whitespace to make the USER_CFLAGS removal of these
  95 # defines more robust
  96
  97 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
  98                          -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
  99 KBUILD_CFLAGS += $(KERNEL_DEFINES)
 100
 101 PHONY += linux
 102
 103 all: linux
 104
 105 linux: vmlinux
 106         @echo '  LINK $@'
 107         $(Q)ln -f $< $@
 108
 109 define archhelp
 110   echo '* linux         - Binary kernel image (./linux) - for backward'
 111   echo '                   compatibility only, this creates a hard link to the'
 112   echo '                   real kernel binary, the "vmlinux" binary you'
 113   echo '                   find in the kernel root.'
 114 endef
 115
 116 KBUILD_KCONFIG := $(HOST_DIR)/um/Kconfig
 117
 118 archheaders:
 119         $(Q)$(MAKE) KBUILD_SRC= ARCH=$(HEADER_ARCH) archheaders
 120
 121 archprepare: include/generated/user_constants.h
 122
 123 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
 124 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
 125
 126 CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
 127         $(call cc-option, -fno-stack-protector,) \
 128         $(call cc-option, -fno-stack-protector-all,)
 129
 130 # Options used by linker script
 131 export LDS_START      := $(START)
 132 export LDS_ELF_ARCH   := $(ELF_ARCH)
 133 export LDS_ELF_FORMAT := $(ELF_FORMAT)
 134
 135 # The wrappers will select whether using "malloc" or the kernel allocator.
 136 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
 137
 138 LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
 139
 140 # Used by link-vmlinux.sh which has special support for um link
 141 export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
 142
 143 # When cleaning we don't include .config, so we don't include
 144 # TT or skas makefiles and don't clean skas_ptregs.h.
 145 CLEAN_FILES += linux x.i gmon.out
 146
 147 archclean:
 148         @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
 149                 -o -name '*.gcov' \) -type f -print | xargs rm -f
 150
 151 # Generated files
 152
 153 $(HOST_DIR)/um/user-offsets.s: __headers FORCE
 154         $(Q)$(MAKE) $(build)=$(HOST_DIR)/um $@
 155
 156 define filechk_gen-asm-offsets
 157         (set -e; \
 158          echo "/*"; \
 159          echo " * DO NOT MODIFY."; \
 160          echo " *"; \
 161          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 162          echo " *"; \
 163          echo " */"; \
 164          echo ""; \
 165          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 166          echo ""; )
 167 endef
 168
 169 include/generated/user_constants.h: $(HOST_DIR)/um/user-offsets.s
 170         $(call filechk,gen-asm-offsets)
 171
 172 export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH