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),$(ARCH_DIR)/include/asm/$(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 = $(ARCH_DIR)/include/asm/arch $(ARCH_DIR)/include/shared/sysdep $(ARCH_DIR)/os \
  32         $(SYMLINK_HEADERS) $(ARCH_DIR)/include/shared/uml-config.h
  33
  34 MODE_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
  35
  36 include $(srctree)/$(ARCH_DIR)/Makefile-skas
  37
  38 ARCH_INCLUDE    := -I$(ARCH_DIR)/include/shared
  39 ifneq ($(KBUILD_SRC),)
  40 ARCH_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/include/shared
  41 KBUILD_CPPFLAGS += -I$(ARCH_DIR)/include # for arch symlink
  42 endif
  43 SYS_DIR         := $(ARCH_DIR)/include/shared/sysdep-$(SUBARCH)
  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
  53 KBUILD_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
  57
  58 KBUILD_AFLAGS += $(ARCH_INCLUDE)
  59
  60 USER_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
  63
  64 include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
  65
  66 #This will adjust *FLAGS accordingly to the platform.
  67 include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
  68
  69 KBUILD_CPPFLAGS += -I$(srctree)/arch/$(HEADER_ARCH)/include
  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 $< $@
  91
  92 define archhelp
  93   echo '* linux         - Binary kernel image (./linux) - for backward'
  94   echo '                   compatibility only, this creates a hard link to the'
  95   echo '                   real kernel binary, the "vmlinux" binary you'
  96   echo '                   find in the kernel root.'
  97 endef
  98
  99 ifneq ($(KBUILD_SRC),)
 100 $(shell mkdir -p $(ARCH_DIR) && ln -fsn $(srctree)/$(ARCH_DIR)/Kconfig.$(SUBARCH) $(ARCH_DIR)/Kconfig.arch)
 101 else
 102 $(shell ln -fsn Kconfig.$(SUBARCH) $(ARCH_DIR)/Kconfig.arch)
 103 endif
 104
 105 archprepare: $(ARCH_SYMLINKS) $(ARCH_DIR)/include/shared/user_constants.h
 106 prepare: $(ARCH_DIR)/include/shared/kern_constants.h
 107
 108 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
 109 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
 110
 111 CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
 112         $(call cc-option, -fno-stack-protector,) \
 113         $(call cc-option, -fno-stack-protector-all,)
 114
 115 CONFIG_KERNEL_STACK_ORDER ?= 2
 116 STACK_SIZE := $(shell echo $$[ 4096 * (1 << $(CONFIG_KERNEL_STACK_ORDER)) ] )
 117
 118 CPPFLAGS_vmlinux.lds = -U$(SUBARCH) -DSTART=$(START) -DELF_ARCH=$(ELF_ARCH) \
 119         -DELF_FORMAT="$(ELF_FORMAT)" -DKERNEL_STACK_SIZE=$(STACK_SIZE)
 120
 121 # The wrappers will select whether using "malloc" or the kernel allocator.
 122 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
 123
 124 LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
 125
 126 CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
 127 define cmd_vmlinux__
 128         $(CC) $(CFLAGS_vmlinux) -o $@ \
 129         -Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
 130         -Wl,--start-group $(vmlinux-main) -Wl,--end-group \
 131         -lutil \
 132         $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o \
 133         FORCE ,$^) ; rm -f linux
 134 endef
 135
 136 # When cleaning we don't include .config, so we don't include
 137 # TT or skas makefiles and don't clean skas_ptregs.h.
 138 CLEAN_FILES += linux x.i gmon.out $(ARCH_DIR)/include/shared/uml-config.h \
 139         $(ARCH_DIR)/include/shared/user_constants.h \
 140         $(ARCH_DIR)/include/shared/kern_constants.h $(ARCH_DIR)/Kconfig.arch
 141
 142 MRPROPER_FILES += $(ARCH_SYMLINKS)
 143
 144 archclean:
 145         @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
 146                 -o -name '*.gcov' \) -type f -print | xargs rm -f
 147
 148 $(SYMLINK_HEADERS):
 149         @echo '  SYMLINK $@'
 150 ifneq ($(KBUILD_SRC),)
 151         $(Q)mkdir -p $(objtree)/$(ARCH_DIR)/include/asm
 152         $(Q)ln -fsn $(srctree)/$(ARCH_DIR)/include/asm/$(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $@
 153 else
 154         $(Q)ln -sf $(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $@
 155 endif
 156
 157 $(ARCH_DIR)/include/asm/arch:
 158         @echo '  SYMLINK $@'
 159 ifneq ($(KBUILD_SRC),)
 160         $(Q)mkdir -p $(objtree)/$(ARCH_DIR)/include/asm
 161         $(Q)ln -fsn $(srctree)/arch/$(HEADER_ARCH)/include/asm $@
 162 else
 163         $(Q)ln -fsn ../../../$(HEADER_ARCH)/include/asm $@
 164 endif
 165
 166 $(objtree)/$(ARCH_DIR)/include/shared:
 167         @echo '  MKDIR $@'
 168         $(Q)mkdir -p $@
 169
 170 $(ARCH_DIR)/include/shared/sysdep: $(objtree)/$(ARCH_DIR)/include/shared
 171         @echo '  SYMLINK $@'
 172 ifneq ($(KBUILD_SRC),)
 173         $(Q)ln -fsn $(srctree)/$(ARCH_DIR)/include/shared/sysdep-$(SUBARCH) $@
 174 else
 175         $(Q)ln -fsn sysdep-$(SUBARCH) $@
 176 endif
 177
 178 $(ARCH_DIR)/os:
 179         @echo '  SYMLINK $@'
 180 ifneq ($(KBUILD_SRC),)
 181         $(Q)ln -fsn $(srctree)/$(ARCH_DIR)/os-$(OS) $@
 182 else
 183         $(Q)ln -fsn os-$(OS) $@
 184 endif
 185
 186 # Generated files
 187 define filechk_umlconfig
 188         sed 's/ CONFIG/ UML_CONFIG/'
 189 endef
 190
 191 $(ARCH_DIR)/include/shared/uml-config.h : include/linux/autoconf.h
 192         $(call filechk,umlconfig)
 193
 194 $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s: FORCE
 195         $(Q)$(MAKE) $(build)=$(ARCH_DIR)/sys-$(SUBARCH) $@
 196
 197 define filechk_gen-asm-offsets
 198         (set -e; \
 199          echo "/*"; \
 200          echo " * DO NOT MODIFY."; \
 201          echo " *"; \
 202          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 203          echo " *"; \
 204          echo " */"; \
 205          echo ""; \
 206          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 207          echo ""; )
 208 endef
 209
 210 $(ARCH_DIR)/include/shared/user_constants.h: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s
 211         $(call filechk,gen-asm-offsets)
 212
 213 $(ARCH_DIR)/include/shared/kern_constants.h: $(objtree)/$(ARCH_DIR)/include/shared
 214         @echo '  SYMLINK $@'
 215         $(Q)ln -sf ../../../../include/asm/asm-offsets.h $@
 216
 217 export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS HEADER_ARCH