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