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 # Have to precede the include because the included Makefiles reference them.
  22 SYMLINK_HEADERS := archparam.h system.h sigcontext.h processor.h ptrace.h \
  23         module.h vm-flags.h elf.h host_ldt.h
  24 SYMLINK_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!
  31 ARCH_SYMLINKS = include/asm-um/arch $(ARCH_DIR)/include/sysdep $(ARCH_DIR)/os \
  32         $(SYMLINK_HEADERS) $(ARCH_DIR)/include/uml-config.h
  33
  34 MODE_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/include/skas
  35
  36 include $(srctree)/$(ARCH_DIR)/Makefile-skas
  37
  38 ARCH_INCLUDE    := -I$(ARCH_DIR)/include
  39 ifneq ($(KBUILD_SRC),)
  40 ARCH_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/include
  41 endif
  42 SYS_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
  52 KBUILD_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
  57 KBUILD_AFLAGS += $(ARCH_INCLUDE)
  58
  59 USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -D__KERNEL__,,\
  60         $(patsubst -I%,,$(KBUILD_CFLAGS)))) $(ARCH_INCLUDE) $(MODE_INCLUDE) \
  61         -D_FILE_OFFSET_BITS=64
  62
  63 include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
  64
  65 #This will adjust *FLAGS accordingly to the platform.
  66 include $(srctree)/$(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
  77 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
  78                          -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
  79 KBUILD_CFLAGS += $(KERNEL_DEFINES)
  80 KBUILD_CFLAGS += $(call cc-option,-fno-unit-at-a-time,)
  81
  82 # These are needed for clean and mrproper, since in that case .config is not
  83 # included; the values here are meaningless
  84
  85 CONFIG_NEST_LEVEL ?= 0
  86
  87 SIZE = ($(CONFIG_NEST_LEVEL) * 0x20000000)
  88
  89 PHONY += linux
  90
  91 all: linux
  92
  93 linux: vmlinux
  94         @echo '  LINK $@'
  95         $(Q)ln -f $< $@
  96
  97 define archhelp
  98   echo '* linux         - Binary kernel image (./linux) - for backward'
  99   echo '                   compatibility only, this creates a hard link to the'
 100   echo '                   real kernel binary, the "vmlinux" binary you'
 101   echo '                   find in the kernel root.'
 102 endef
 103
 104 ifneq ($(KBUILD_SRC),)
 105 $(shell mkdir -p $(ARCH_DIR) && ln -fsn $(srctree)/$(ARCH_DIR)/Kconfig.$(SUBARCH) $(ARCH_DIR)/Kconfig.arch)
 106 else
 107 $(shell cd $(ARCH_DIR) && ln -sf Kconfig.$(SUBARCH) Kconfig.arch)
 108 endif
 109
 110 archprepare: $(ARCH_SYMLINKS) $(ARCH_DIR)/include/user_constants.h
 111 prepare: $(ARCH_DIR)/include/kern_constants.h
 112
 113 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
 114 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
 115
 116 CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
 117         $(call cc-option, -fno-stack-protector,) \
 118         $(call cc-option, -fno-stack-protector-all,)
 119
 120 CONFIG_KERNEL_STACK_ORDER ?= 2
 121 STACK_SIZE := $(shell echo $$[ 4096 * (1 << $(CONFIG_KERNEL_STACK_ORDER)) ] )
 122
 123 ifndef START
 124   START = $(shell echo $$[ $(TOP_ADDR) - $(SIZE) ] )
 125 endif
 126
 127 CPPFLAGS_vmlinux.lds = -U$(SUBARCH) -DSTART=$(START) -DELF_ARCH=$(ELF_ARCH) \
 128         -DELF_FORMAT="$(ELF_FORMAT)" -DKERNEL_STACK_SIZE=$(STACK_SIZE)
 129
 130 # The wrappers will select whether using "malloc" or the kernel allocator.
 131 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
 132
 133 CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS)
 134 define cmd_vmlinux__
 135         $(CC) $(CFLAGS_vmlinux) -o $@ \
 136         -Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
 137         -Wl,--start-group $(vmlinux-main) -Wl,--end-group \
 138         -lutil \
 139         $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o \
 140         FORCE ,$^) ; rm -f linux
 141 endef
 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 $(ARCH_DIR)/include/uml-config.h \
 146         $(ARCH_DIR)/include/user_constants.h \
 147         $(ARCH_DIR)/include/kern_constants.h $(ARCH_DIR)/Kconfig.arch
 148
 149 MRPROPER_FILES += $(ARCH_SYMLINKS)
 150
 151 archclean:
 152         @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
 153                 -o -name '*.gcov' \) -type f -print | xargs rm -f
 154
 155 $(SYMLINK_HEADERS):
 156         @echo '  SYMLINK $@'
 157 ifneq ($(KBUILD_SRC),)
 158         $(Q)mkdir -p $(objtree)/include/asm-um
 159         $(Q)ln -fsn $(srctree)/include/asm-um/$(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $@
 160 else
 161         $(Q)cd $(TOPDIR)/$(dir $@) ; \
 162         ln -sf $(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $(notdir $@)
 163 endif
 164
 165 include/asm-um/arch:
 166         @echo '  SYMLINK $@'
 167 ifneq ($(KBUILD_SRC),)
 168         $(Q)mkdir -p $(objtree)/include/asm-um
 169         $(Q)ln -fsn $(srctree)/include/asm-$(HEADER_ARCH) include/asm-um/arch
 170 else
 171         $(Q)cd $(TOPDIR)/include/asm-um && ln -fsn ../asm-$(HEADER_ARCH) arch
 172 endif
 173
 174 $(objtree)/$(ARCH_DIR)/include:
 175         @echo '  MKDIR $@'
 176         $(Q)mkdir -p $@
 177
 178 $(ARCH_DIR)/include/sysdep: $(objtree)/$(ARCH_DIR)/include
 179         @echo '  SYMLINK $@'
 180 ifneq ($(KBUILD_SRC),)
 181         $(Q)ln -fsn $(srctree)/$(ARCH_DIR)/include/sysdep-$(SUBARCH) $(ARCH_DIR)/include/sysdep
 182 else
 183         $(Q)cd $(ARCH_DIR)/include && ln -fsn sysdep-$(SUBARCH) sysdep
 184 endif
 185
 186 $(ARCH_DIR)/os:
 187         @echo '  SYMLINK $@'
 188 ifneq ($(KBUILD_SRC),)
 189         $(Q)ln -fsn $(srctree)/$(ARCH_DIR)/os-$(OS) $(ARCH_DIR)/os
 190 else
 191         $(Q)cd $(ARCH_DIR) && ln -fsn os-$(OS) os
 192 endif
 193
 194 # Generated files
 195 define filechk_umlconfig
 196         sed 's/ CONFIG/ UML_CONFIG/'
 197 endef
 198
 199 $(ARCH_DIR)/include/uml-config.h : include/linux/autoconf.h
 200         $(call filechk,umlconfig)
 201
 202 $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s: FORCE
 203         $(Q)$(MAKE) $(build)=$(ARCH_DIR)/sys-$(SUBARCH) $@
 204
 205 define filechk_gen-asm-offsets
 206         (set -e; \
 207          echo "/*"; \
 208          echo " * DO NOT MODIFY."; \
 209          echo " *"; \
 210          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 211          echo " *"; \
 212          echo " */"; \
 213          echo ""; \
 214          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 215          echo ""; )
 216 endef
 217
 218 $(ARCH_DIR)/include/user_constants.h: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s
 219         $(call filechk,gen-asm-offsets)
 220
 221 $(ARCH_DIR)/include/kern_constants.h: $(objtree)/$(ARCH_DIR)/include
 222         @echo '  SYMLINK $@'
 223         $(Q)ln -sf ../../../include/asm-um/asm-offsets.h $@
 224
 225 export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS HEADER_ARCH