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 Jeff Dike (jdike@karaya.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) $(ARCH_DIR)/include/uml-config.h
  33
  34 um-modes-$(CONFIG_MODE_TT) += tt
  35 um-modes-$(CONFIG_MODE_SKAS) += skas
  36
  37 MODE_INCLUDE    += $(foreach mode,$(um-modes-y),\
  38                    -I$(srctree)/$(ARCH_DIR)/include/$(mode))
  39
  40 MAKEFILES-INCL  += $(foreach mode,$(um-modes-y),\
  41                    $(srctree)/$(ARCH_DIR)/Makefile-$(mode))
  42
  43 ifneq ($(MAKEFILES-INCL),)
  44   include $(MAKEFILES-INCL)
  45 endif
  46
  47 ARCH_INCLUDE    := -I$(ARCH_DIR)/include
  48 ifneq ($(KBUILD_SRC),)
  49 ARCH_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/include
  50 endif
  51 SYS_DIR         := $(ARCH_DIR)/include/sysdep-$(SUBARCH)
  52
  53 # -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
  54 # named - it's a common symbol in libpcap, so we get a binary which crashes.
  55 #
  56 # Same things for in6addr_loopback and mktime - found in libc. For these two we
  57 # only get link-time error, luckily.
  58 #
  59 # These apply to USER_CFLAGS to.
  60
  61 CFLAGS += $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\"    \
  62         $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap      \
  63         -Din6addr_loopback=kernel_in6addr_loopback
  64
  65 AFLAGS += $(ARCH_INCLUDE)
  66
  67 USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -D__KERNEL__,,\
  68         $(patsubst -I%,,$(CFLAGS)))) $(ARCH_INCLUDE) $(MODE_INCLUDE) \
  69         -D_FILE_OFFSET_BITS=64
  70
  71 include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
  72
  73 #This will adjust *FLAGS accordingly to the platform.
  74 include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
  75
  76 # -Derrno=kernel_errno - This turns all kernel references to errno into
  77 # kernel_errno to separate them from the libc errno.  This allows -fno-common
  78 # in CFLAGS.  Otherwise, it would cause ld to complain about the two different
  79 # errnos.
  80 # These apply to kernelspace only.
  81
  82 KERNEL_DEFINES = -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
  83         -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES)
  84 CFLAGS += $(KERNEL_DEFINES)
  85 CFLAGS += $(call cc-option,-fno-unit-at-a-time,)
  86
  87 # These are needed for clean and mrproper, since in that case .config is not
  88 # included; the values here are meaningless
  89
  90 CONFIG_NEST_LEVEL ?= 0
  91 CONFIG_KERNEL_HALF_GIGS ?= 0
  92
  93 SIZE = (($(CONFIG_NEST_LEVEL) + $(CONFIG_KERNEL_HALF_GIGS)) * 0x20000000)
  94
  95 PHONY += linux
  96
  97 all: linux
  98
  99 linux: vmlinux
 100         @echo '  LINK $@'
 101         $(Q)ln -f $< $@
 102
 103 define archhelp
 104   echo '* linux         - Binary kernel image (./linux) - for backward'
 105   echo '                   compatibility only, this creates a hard link to the'
 106   echo '                   real kernel binary, the "vmlinux" binary you'
 107   echo '                   find in the kernel root.'
 108 endef
 109
 110 ifneq ($(KBUILD_SRC),)
 111 $(shell mkdir -p $(ARCH_DIR) && ln -fsn $(srctree)/$(ARCH_DIR)/Kconfig.$(SUBARCH) $(ARCH_DIR)/Kconfig.arch)
 112 else
 113 $(shell cd $(ARCH_DIR) && ln -sf Kconfig.$(SUBARCH) Kconfig.arch)
 114 endif
 115
 116 archprepare: $(ARCH_SYMLINKS) $(ARCH_DIR)/include/user_constants.h
 117 prepare: $(ARCH_DIR)/include/kern_constants.h
 118
 119 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
 120 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
 121
 122 CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
 123         $(call cc-option, -fno-stack-protector,) \
 124         $(call cc-option, -fno-stack-protector-all,)
 125
 126 CPP_MODE-$(CONFIG_MODE_TT) := -DMODE_TT
 127 CONFIG_KERNEL_STACK_ORDER ?= 2
 128 STACK_SIZE := $(shell echo $$[ 4096 * (1 << $(CONFIG_KERNEL_STACK_ORDER)) ] )
 129
 130 ifndef START
 131   START = $(shell echo $$[ $(TOP_ADDR) - $(SIZE) ] )
 132 endif
 133
 134 CPPFLAGS_vmlinux.lds = -U$(SUBARCH) \
 135         -DSTART=$(START) -DELF_ARCH=$(ELF_ARCH) \
 136         -DELF_FORMAT="$(ELF_FORMAT)" $(CPP_MODE-y) \
 137         -DKERNEL_STACK_SIZE=$(STACK_SIZE) \
 138         -DUNMAP_PATH=arch/um/sys-$(SUBARCH)/unmap.o
 139
 140 #The wrappers will select whether using "malloc" or the kernel allocator.
 141 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
 142
 143 CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS)
 144 define cmd_vmlinux__
 145         $(CC) $(CFLAGS_vmlinux) -o $@ \
 146         -Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
 147         -Wl,--start-group $(vmlinux-main) -Wl,--end-group \
 148         -lutil \
 149         $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) \
 150         FORCE ,$^) ; rm -f linux
 151 endef
 152
 153 #When cleaning we don't include .config, so we don't include
 154 #TT or skas makefiles and don't clean skas_ptregs.h.
 155 CLEAN_FILES += linux x.i gmon.out $(ARCH_DIR)/include/uml-config.h \
 156         $(ARCH_DIR)/include/user_constants.h \
 157         $(ARCH_DIR)/include/kern_constants.h $(ARCH_DIR)/Kconfig.arch
 158
 159 MRPROPER_FILES += $(ARCH_SYMLINKS)
 160
 161 archclean:
 162         @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
 163                 -o -name '*.gcov' \) -type f -print | xargs rm -f
 164
 165 $(SYMLINK_HEADERS):
 166         @echo '  SYMLINK $@'
 167 ifneq ($(KBUILD_SRC),)
 168         $(Q)mkdir -p $(objtree)/include/asm-um
 169         $(Q)ln -fsn $(srctree)/include/asm-um/$(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $@
 170 else
 171         $(Q)cd $(TOPDIR)/$(dir $@) ; \
 172         ln -sf $(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $(notdir $@)
 173 endif
 174
 175 include/asm-um/arch:
 176         @echo '  SYMLINK $@'
 177 ifneq ($(KBUILD_SRC),)
 178         $(Q)mkdir -p $(objtree)/include/asm-um
 179         $(Q)ln -fsn $(srctree)/include/asm-$(SUBARCH) include/asm-um/arch
 180 else
 181         $(Q)cd $(TOPDIR)/include/asm-um && ln -sf ../asm-$(SUBARCH) arch
 182 endif
 183
 184 $(objtree)/$(ARCH_DIR)/include:
 185         @echo '  MKDIR $@'
 186         $(Q)mkdir -p $@
 187
 188 $(ARCH_DIR)/include/sysdep: $(objtree)/$(ARCH_DIR)/include
 189         @echo '  SYMLINK $@'
 190 ifneq ($(KBUILD_SRC),)
 191         $(Q)ln -fsn $(srctree)/$(ARCH_DIR)/include/sysdep-$(SUBARCH) $(ARCH_DIR)/include/sysdep
 192 else
 193         $(Q)cd $(ARCH_DIR)/include && ln -sf sysdep-$(SUBARCH) sysdep
 194 endif
 195
 196 $(ARCH_DIR)/os:
 197         @echo '  SYMLINK $@'
 198 ifneq ($(KBUILD_SRC),)
 199         $(Q)ln -fsn $(srctree)/$(ARCH_DIR)/os-$(OS) $(ARCH_DIR)/os
 200 else
 201         $(Q)cd $(ARCH_DIR) && ln -sf os-$(OS) os
 202 endif
 203
 204 # Generated files
 205 define filechk_umlconfig
 206         sed 's/ CONFIG/ UML_CONFIG/'
 207 endef
 208
 209 $(ARCH_DIR)/include/uml-config.h : include/linux/autoconf.h
 210         $(call filechk,umlconfig)
 211
 212 $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s: FORCE
 213         $(Q)$(MAKE) $(build)=$(ARCH_DIR)/sys-$(SUBARCH) $@
 214
 215 define filechk_gen-asm-offsets
 216         (set -e; \
 217          echo "/*"; \
 218          echo " * DO NOT MODIFY."; \
 219          echo " *"; \
 220          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 221          echo " *"; \
 222          echo " */"; \
 223          echo ""; \
 224          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 225          echo ""; )
 226 endef
 227
 228 $(ARCH_DIR)/include/user_constants.h: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s
 229         $(call filechk,gen-asm-offsets)
 230
 231 $(ARCH_DIR)/include/kern_constants.h: $(objtree)/$(ARCH_DIR)/include
 232         @echo '  SYMLINK $@'
 233         $(Q)ln -sf ../../../include/asm-um/asm-offsets.h $@
 234
 235 export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS