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 ARCH_DIR := arch/um
  10 OS := $(shell uname -s)
  11 # We require bash because the vmlinux link and loader script cpp use bash
  12 # features.
  13 SHELL := /bin/bash
  14
  15 filechk_gen_header = $<
  16
  17 core-y                  += $(ARCH_DIR)/kernel/          \
  18                            $(ARCH_DIR)/drivers/         \
  19                            $(ARCH_DIR)/os-$(OS)/
  20
  21 MODE_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
  22
  23 HEADER_ARCH     := $(SUBARCH)
  24
  25 # Additional ARCH settings for x86
  26 ifeq ($(SUBARCH),i386)
  27         HEADER_ARCH := x86
  28 endif
  29 ifeq ($(SUBARCH),x86_64)
  30         HEADER_ARCH := x86
  31         KBUILD_CFLAGS += -mcmodel=large
  32 endif
  33
  34 HOST_DIR := arch/$(HEADER_ARCH)
  35
  36 include $(srctree)/$(ARCH_DIR)/Makefile-skas
  37 include $(srctree)/$(HOST_DIR)/Makefile.um
  38
  39 core-y += $(HOST_DIR)/um/
  40
  41 SHARED_HEADERS  := $(ARCH_DIR)/include/shared
  42 ARCH_INCLUDE    := -I$(srctree)/$(SHARED_HEADERS)
  43 ARCH_INCLUDE    += -I$(srctree)/$(HOST_DIR)/um/shared
  44 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
  45
  46 # -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
  47 # named - it's a common symbol in libpcap, so we get a binary which crashes.
  48 #
  49 # Same things for in6addr_loopback and mktime - found in libc. For these two we
  50 # only get link-time error, luckily.
  51 #
  52 # These apply to USER_CFLAGS to.
  53
  54 KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
  55         $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap      \
  56         -Din6addr_loopback=kernel_in6addr_loopback \
  57         -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
  58
  59 KBUILD_AFLAGS += $(ARCH_INCLUDE)
  60
  61 USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -D__KERNEL__,,\
  62         $(patsubst -I%,,$(KBUILD_CFLAGS)))) $(ARCH_INCLUDE) $(MODE_INCLUDE) \
  63         $(filter -I%,$(CFLAGS)) -D_FILE_OFFSET_BITS=64 -idirafter include
  64
  65 #This will adjust *FLAGS accordingly to the platform.
  66 include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
  67
  68 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
  69                    -I$(HOST_DIR)/include/generated
  70
  71 # -Derrno=kernel_errno - This turns all kernel references to errno into
  72 # kernel_errno to separate them from the libc errno.  This allows -fno-common
  73 # in KBUILD_CFLAGS.  Otherwise, it would cause ld to complain about the two different
  74 # errnos.
  75 # These apply to kernelspace only.
  76 #
  77 # strip leading and trailing whitespace to make the USER_CFLAGS removal of these
  78 # defines more robust
  79
  80 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
  81                          -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
  82 KBUILD_CFLAGS += $(KERNEL_DEFINES)
  83
  84 PHONY += linux
  85
  86 all: linux
  87
  88 linux: vmlinux
  89         @echo '  LINK $@'
  90         $(Q)ln -f $< $@
  91
  92 define archhelp
  93   echo '* linux         - Binary kernel image (./linux) - for backward'
  94   echo '                   compatibility only, this creates a hard link to the'
  95   echo '                   real kernel binary, the "vmlinux" binary you'
  96   echo '                   find in the kernel root.'
  97 endef
  98
  99 KBUILD_KCONFIG := $(HOST_DIR)/um/Kconfig
 100
 101 archheaders:
 102         $(Q)$(MAKE) -C '$(srctree)' KBUILD_SRC= \
 103                 ARCH=$(HEADER_ARCH) O='$(objtree)' archheaders
 104
 105 archprepare: include/generated/user_constants.h
 106
 107 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
 108 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
 109
 110 CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
 111         $(call cc-option, -fno-stack-protector,) \
 112         $(call cc-option, -fno-stack-protector-all,)
 113
 114 # Options used by linker script
 115 export LDS_START      := $(START)
 116 export LDS_ELF_ARCH   := $(ELF_ARCH)
 117 export LDS_ELF_FORMAT := $(ELF_FORMAT)
 118
 119 # The wrappers will select whether using "malloc" or the kernel allocator.
 120 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
 121
 122 LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
 123
 124 # Used by link-vmlinux.sh which has special support for um link
 125 export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
 126
 127 # When cleaning we don't include .config, so we don't include
 128 # TT or skas makefiles and don't clean skas_ptregs.h.
 129 CLEAN_FILES += linux x.i gmon.out
 130
 131 archclean:
 132         @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
 133                 -o -name '*.gcov' \) -type f -print | xargs rm -f
 134
 135 # Generated files
 136
 137 $(HOST_DIR)/um/user-offsets.s: __headers FORCE
 138         $(Q)$(MAKE) $(build)=$(HOST_DIR)/um $@
 139
 140 define filechk_gen-asm-offsets
 141         (set -e; \
 142          echo "/*"; \
 143          echo " * DO NOT MODIFY."; \
 144          echo " *"; \
 145          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 146          echo " *"; \
 147          echo " */"; \
 148          echo ""; \
 149          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 150          echo ""; )
 151 endef
 152
 153 include/generated/user_constants.h: $(HOST_DIR)/um/user-offsets.s
 154         $(call filechk,gen-asm-offsets)
 155
 156 export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH