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 MODE_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
  22
  23 include $(srctree)/$(ARCH_DIR)/Makefile-skas
  24
  25 ARCH_INCLUDE    := -I$(srctree)/$(ARCH_DIR)/include/shared
  26 ARCH_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/sys-$(SUBARCH)/shared
  27 ifneq ($(KBUILD_SRC),)
  28 ARCH_INCLUDE    += -I$(ARCH_DIR)/include/shared # for two generated files
  29 endif
  30 KBUILD_CPPFLAGS += -I$(srctree)/$(ARCH_DIR)/sys-$(SUBARCH)
  31
  32 # -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
  33 # named - it's a common symbol in libpcap, so we get a binary which crashes.
  34 #
  35 # Same things for in6addr_loopback and mktime - found in libc. For these two we
  36 # only get link-time error, luckily.
  37 #
  38 # These apply to USER_CFLAGS to.
  39
  40 KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\" \
  41         $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap      \
  42         -Din6addr_loopback=kernel_in6addr_loopback \
  43         -Din6addr_any=kernel_in6addr_any
  44
  45 KBUILD_AFLAGS += $(ARCH_INCLUDE)
  46
  47 USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -D__KERNEL__,,\
  48         $(patsubst -I%,,$(KBUILD_CFLAGS)))) $(ARCH_INCLUDE) $(MODE_INCLUDE) \
  49         $(filter -I%,$(CFLAGS)) -D_FILE_OFFSET_BITS=64
  50
  51 include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
  52
  53 #This will adjust *FLAGS accordingly to the platform.
  54 include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
  55
  56 KBUILD_CPPFLAGS += -I$(srctree)/arch/$(HEADER_ARCH)/include
  57
  58 # -Derrno=kernel_errno - This turns all kernel references to errno into
  59 # kernel_errno to separate them from the libc errno.  This allows -fno-common
  60 # in KBUILD_CFLAGS.  Otherwise, it would cause ld to complain about the two different
  61 # errnos.
  62 # These apply to kernelspace only.
  63 #
  64 # strip leading and trailing whitespace to make the USER_CFLAGS removal of these
  65 # defines more robust
  66
  67 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
  68                          -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
  69 KBUILD_CFLAGS += $(KERNEL_DEFINES)
  70
  71 PHONY += linux
  72
  73 all: linux
  74
  75 linux: vmlinux
  76         @echo '  LINK $@'
  77         $(Q)ln -f $< $@
  78
  79 define archhelp
  80   echo '* linux         - Binary kernel image (./linux) - for backward'
  81   echo '                   compatibility only, this creates a hard link to the'
  82   echo '                   real kernel binary, the "vmlinux" binary you'
  83   echo '                   find in the kernel root.'
  84 endef
  85
  86 KBUILD_KCONFIG := arch/um/Kconfig.$(HEADER_ARCH)
  87
  88 archprepare: $(ARCH_DIR)/include/shared/user_constants.h
  89 prepare: $(ARCH_DIR)/include/shared/kern_constants.h
  90
  91 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
  92 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
  93
  94 CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
  95         $(call cc-option, -fno-stack-protector,) \
  96         $(call cc-option, -fno-stack-protector-all,)
  97
  98 CONFIG_KERNEL_STACK_ORDER ?= 2
  99 STACK_SIZE := $(shell echo $$[ 4096 * (1 << $(CONFIG_KERNEL_STACK_ORDER)) ] )
 100
 101 CPPFLAGS_vmlinux.lds = -U$(SUBARCH) -DSTART=$(START) -DELF_ARCH=$(ELF_ARCH) \
 102         -DELF_FORMAT="$(ELF_FORMAT)" -DKERNEL_STACK_SIZE=$(STACK_SIZE)
 103
 104 # The wrappers will select whether using "malloc" or the kernel allocator.
 105 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
 106
 107 LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
 108
 109 CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
 110 define cmd_vmlinux__
 111         $(CC) $(CFLAGS_vmlinux) -o $@ \
 112         -Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
 113         -Wl,--start-group $(vmlinux-main) -Wl,--end-group \
 114         -lutil \
 115         $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o \
 116         FORCE ,$^) ; rm -f linux
 117 endef
 118
 119 # When cleaning we don't include .config, so we don't include
 120 # TT or skas makefiles and don't clean skas_ptregs.h.
 121 CLEAN_FILES += linux x.i gmon.out \
 122         $(ARCH_DIR)/include/shared/user_constants.h \
 123         $(ARCH_DIR)/include/shared/kern_constants.h
 124
 125 archclean:
 126         @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
 127                 -o -name '*.gcov' \) -type f -print | xargs rm -f
 128
 129 $(objtree)/$(ARCH_DIR)/include/shared:
 130         @echo '  MKDIR $@'
 131         $(Q)mkdir -p $@
 132
 133 # Generated files
 134
 135 $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s: FORCE
 136         $(Q)$(MAKE) $(build)=$(ARCH_DIR)/sys-$(SUBARCH) $@
 137
 138 define filechk_gen-asm-offsets
 139         (set -e; \
 140          echo "/*"; \
 141          echo " * DO NOT MODIFY."; \
 142          echo " *"; \
 143          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 144          echo " *"; \
 145          echo " */"; \
 146          echo ""; \
 147          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 148          echo ""; )
 149 endef
 150
 151 $(ARCH_DIR)/include/shared/user_constants.h: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s
 152         $(call filechk,gen-asm-offsets)
 153
 154 $(ARCH_DIR)/include/shared/kern_constants.h: $(objtree)/$(ARCH_DIR)/include/shared
 155         @echo '  SYMLINK $@'
 156         $(Q)ln -sf ../../../../include/asm/asm-offsets.h $@
 157
 158 export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS HEADER_ARCH DEV_NULL_PATH