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
  21# Have to precede the include because the included Makefiles reference them.
  22SYMLINK_HEADERS := archparam.h system.h sigcontext.h processor.h ptrace.h \
  23        module.h vm-flags.h elf.h host_ldt.h
  24SYMLINK_HEADERS := $(foreach header,$(SYMLINK_HEADERS),include/asm-um/$(header))
  25
  26# XXX: The "os" symlink is only used by arch/um/include/os.h, which includes
  27# ../os/include/file.h
  28#
  29# These are cleaned up during mrproper. Please DO NOT fix it again, this is
  30# the Correct Thing(tm) to do!
  31ARCH_SYMLINKS = include/asm-um/arch $(ARCH_DIR)/include/sysdep $(ARCH_DIR)/os \
  32        $(SYMLINK_HEADERS) $(ARCH_DIR)/include/uml-config.h
  33
  34MODE_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/include/skas
  35
  36include $(srctree)/$(ARCH_DIR)/Makefile-skas
  37
  38ARCH_INCLUDE    := -I$(ARCH_DIR)/include
  39ifneq ($(KBUILD_SRC),)
  40ARCH_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/include
  41endif
  42SYS_DIR         := $(ARCH_DIR)/include/sysdep-$(SUBARCH)
  43
  44# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
  45# named - it's a common symbol in libpcap, so we get a binary which crashes.
  46#
  47# Same things for in6addr_loopback and mktime - found in libc. For these two we
  48# only get link-time error, luckily.
  49#
  50# These apply to USER_CFLAGS to.
  51
  52KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\" \
  53        $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap      \
  54        -Din6addr_loopback=kernel_in6addr_loopback \
  55        -Din6addr_any=kernel_in6addr_any
  56
  57KBUILD_AFLAGS += $(ARCH_INCLUDE)
  58
  59USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -D__KERNEL__,,\
  60        $(patsubst -I%,,$(KBUILD_CFLAGS)))) $(ARCH_INCLUDE) $(MODE_INCLUDE) \
  61        $(filter -I%,$(CFLAGS)) -D_FILE_OFFSET_BITS=64
  62
  63include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
  64
  65#This will adjust *FLAGS accordingly to the platform.
  66include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
  67
  68# -Derrno=kernel_errno - This turns all kernel references to errno into
  69# kernel_errno to separate them from the libc errno.  This allows -fno-common
  70# in KBUILD_CFLAGS.  Otherwise, it would cause ld to complain about the two different
  71# errnos.
  72# These apply to kernelspace only.
  73#
  74# strip leading and trailing whitespace to make the USER_CFLAGS removal of these
  75# defines more robust
  76
  77KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
  78                         -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
  79KBUILD_CFLAGS += $(KERNEL_DEFINES)
  80
  81PHONY += linux
  82
  83all: linux
  84
  85linux: vmlinux
  86        @echo '  LINK $@'
  87        $(Q)ln -f $< $@
  88
  89define archhelp
  90  echo '* linux         - Binary kernel image (./linux) - for backward'
  91  echo '                   compatibility only, this creates a hard link to the'
  92  echo '                   real kernel binary, the "vmlinux" binary you'
  93  echo '                   find in the kernel root.'
  94endef
  95
  96ifneq ($(KBUILD_SRC),)
  97$(shell mkdir -p $(ARCH_DIR) && ln -fsn $(srctree)/$(ARCH_DIR)/Kconfig.$(SUBARCH) $(ARCH_DIR)/Kconfig.arch)
  98else
  99$(shell cd $(ARCH_DIR) && ln -sf Kconfig.$(SUBARCH) Kconfig.arch)
 100endif
 101
 102archprepare: $(ARCH_SYMLINKS) $(ARCH_DIR)/include/user_constants.h
 103prepare: $(ARCH_DIR)/include/kern_constants.h
 104
 105LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
 106LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
 107
 108CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
 109        $(call cc-option, -fno-stack-protector,) \
 110        $(call cc-option, -fno-stack-protector-all,)
 111
 112CONFIG_KERNEL_STACK_ORDER ?= 2
 113STACK_SIZE := $(shell echo $$[ 4096 * (1 << $(CONFIG_KERNEL_STACK_ORDER)) ] )
 114
 115CPPFLAGS_vmlinux.lds = -U$(SUBARCH) -DSTART=$(START) -DELF_ARCH=$(ELF_ARCH) \
 116        -DELF_FORMAT="$(ELF_FORMAT)" -DKERNEL_STACK_SIZE=$(STACK_SIZE)
 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 $(ARCH_DIR)/include/uml-config.h \
 136        $(ARCH_DIR)/include/user_constants.h \
 137        $(ARCH_DIR)/include/kern_constants.h $(ARCH_DIR)/Kconfig.arch
 138
 139MRPROPER_FILES += $(ARCH_SYMLINKS)
 140
 141archclean:
 142        @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
 143                -o -name '*.gcov' \) -type f -print | xargs rm -f
 144
 145$(SYMLINK_HEADERS):
 146        @echo '  SYMLINK $@'
 147ifneq ($(KBUILD_SRC),)
 148        $(Q)mkdir -p $(objtree)/include/asm-um
 149        $(Q)ln -fsn $(srctree)/include/asm-um/$(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $@
 150else
 151        $(Q)cd $(srctree)/$(dir $@) ; \
 152        ln -sf $(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $(notdir $@)
 153endif
 154
 155include/asm-um/arch:
 156        @echo '  SYMLINK $@'
 157ifneq ($(KBUILD_SRC),)
 158        $(Q)mkdir -p $(objtree)/include/asm-um
 159        $(Q)ln -fsn $(srctree)/include/asm-$(HEADER_ARCH) include/asm-um/arch
 160else
 161        $(Q)cd $(srctree)/include/asm-um && ln -fsn ../asm-$(HEADER_ARCH) arch
 162endif
 163
 164$(objtree)/$(ARCH_DIR)/include:
 165        @echo '  MKDIR $@'
 166        $(Q)mkdir -p $@
 167
 168$(ARCH_DIR)/include/sysdep: $(objtree)/$(ARCH_DIR)/include
 169        @echo '  SYMLINK $@'
 170ifneq ($(KBUILD_SRC),)
 171        $(Q)ln -fsn $(srctree)/$(ARCH_DIR)/include/sysdep-$(SUBARCH) $(ARCH_DIR)/include/sysdep
 172else
 173        $(Q)cd $(ARCH_DIR)/include && ln -fsn sysdep-$(SUBARCH) sysdep
 174endif
 175
 176$(ARCH_DIR)/os:
 177        @echo '  SYMLINK $@'
 178ifneq ($(KBUILD_SRC),)
 179        $(Q)ln -fsn $(srctree)/$(ARCH_DIR)/os-$(OS) $(ARCH_DIR)/os
 180else
 181        $(Q)cd $(ARCH_DIR) && ln -fsn os-$(OS) os
 182endif
 183
 184# Generated files
 185define filechk_umlconfig
 186        sed 's/ CONFIG/ UML_CONFIG/'
 187endef
 188
 189$(ARCH_DIR)/include/uml-config.h : include/linux/autoconf.h
 190        $(call filechk,umlconfig)
 191
 192$(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s: FORCE
 193        $(Q)$(MAKE) $(build)=$(ARCH_DIR)/sys-$(SUBARCH) $@
 194
 195define filechk_gen-asm-offsets
 196        (set -e; \
 197         echo "/*"; \
 198         echo " * DO NOT MODIFY."; \
 199         echo " *"; \
 200         echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 201         echo " *"; \
 202         echo " */"; \
 203         echo ""; \
 204         sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 205         echo ""; )
 206endef
 207
 208$(ARCH_DIR)/include/user_constants.h: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s
 209        $(call filechk,gen-asm-offsets)
 210
 211$(ARCH_DIR)/include/kern_constants.h: $(objtree)/$(ARCH_DIR)/include
 212        @echo '  SYMLINK $@'
 213        $(Q)ln -sf ../../../include/asm-um/asm-offsets.h $@
 214
 215export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS HEADER_ARCH
 216