linux/arch/um/Makefile
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   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
   9ARCH_DIR := arch/um
  10OS := $(shell uname -s)
  11# We require bash because the vmlinux link and loader script cpp use bash
  12# features.
  13SHELL := /bin/bash
  14
  15filechk_gen_header = $<
  16
  17core-y                  += $(ARCH_DIR)/kernel/          \
  18                           $(ARCH_DIR)/drivers/         \
  19                           $(ARCH_DIR)/os-$(OS)/
  20
  21MODE_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
  22
  23HEADER_ARCH     := $(SUBARCH)
  24
  25# Additional ARCH settings for x86
  26ifeq ($(SUBARCH),i386)
  27        HEADER_ARCH := x86
  28endif
  29ifeq ($(SUBARCH),x86_64)
  30        HEADER_ARCH := x86
  31        KBUILD_CFLAGS += -mcmodel=large
  32endif
  33
  34HOST_DIR := arch/$(HEADER_ARCH)
  35
  36include $(srctree)/$(ARCH_DIR)/Makefile-skas
  37include $(srctree)/$(HOST_DIR)/Makefile.um
  38
  39core-y += $(HOST_DIR)/um/
  40
  41SHARED_HEADERS  := $(ARCH_DIR)/include/shared
  42ARCH_INCLUDE    := -I$(srctree)/$(SHARED_HEADERS)
  43ARCH_INCLUDE    += -I$(srctree)/$(HOST_DIR)/um/shared
  44KBUILD_CPPFLAGS += -I$(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
  54KBUILD_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
  59KBUILD_AFLAGS += $(ARCH_INCLUDE)
  60
  61USER_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.
  66include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
  67
  68KBUILD_CPPFLAGS += -I$(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
  80KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
  81                         -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
  82KBUILD_CFLAGS += $(KERNEL_DEFINES)
  83
  84PHONY += linux
  85
  86all: linux
  87
  88linux: vmlinux
  89        @echo '  LINK $@'
  90        $(Q)ln -f $< $@
  91
  92define 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.'
  97endef
  98
  99KBUILD_KCONFIG := $(HOST_DIR)/um/Kconfig
 100
 101archheaders:
 102        $(Q)$(MAKE) -C '$(srctree)' KBUILD_SRC= \
 103                ARCH=$(HEADER_ARCH) O='$(objtree)' archheaders
 104
 105archprepare: include/generated/user_constants.h
 106
 107LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
 108LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
 109
 110CFLAGS_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
 115export LDS_START      := $(START)
 116export LDS_ELF_ARCH   := $(ELF_ARCH)
 117export LDS_ELF_FORMAT := $(ELF_FORMAT)
 118
 119# The wrappers will select whether using "malloc" or the kernel allocator.
 120LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
 121
 122LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
 123
 124# Used by link-vmlinux.sh which has special support for um link
 125export 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.
 129CLEAN_FILES += linux x.i gmon.out
 130
 131archclean:
 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 $@
 139
 140define filechk_gen-asm-offsets
 141        (set -e; \
 142         echo "/*"; \
 143         echo " * DO NOT MODIFY."; \
 144         echo " *"; \
 145         echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 146         echo " *"; \
 147         echo " */"; \
 148         echo ""; \
 149         sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 150         echo ""; )
 151endef
 152
 153include/generated/user_constants.h: $(HOST_DIR)/um/user-offsets.s
 154        $(call filechk,gen-asm-offsets)
 155
 156export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH
 157
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