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 HEADER_ARCH     := $(SUBARCH)
  24
  25 # Additional ARCH settings for x86
  26 ifeq ($(SUBARCH),i386)
  27         HEADER_ARCH := x86
  28 endif
  29 ifeq ($(SUBARCH),x86_64)
  30         HEADER_ARCH := x86
  31 endif
  32
  33 HOST_DIR := arch/$(HEADER_ARCH)
  34
  35 include $(srctree)/$(ARCH_DIR)/Makefile-skas
  36 include $(srctree)/$(HOST_DIR)/Makefile.um
  37
  38 core-y += $(HOST_DIR)/um/
  39
  40 SHARED_HEADERS  := $(ARCH_DIR)/include/shared
  41 ARCH_INCLUDE    := -I$(srctree)/$(SHARED_HEADERS)
  42 ARCH_INCLUDE    += -I$(srctree)/$(HOST_DIR)/um/shared
  43 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
  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 -Dstrrchr=kernel_strrchr
  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 -idirafter include
  63
  64 #This will adjust *FLAGS accordingly to the platform.
  65 include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
  66
  67 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
  68                    -I$(HOST_DIR)/include/generated
  69
  70 # -Derrno=kernel_errno - This turns all kernel references to errno into
  71 # kernel_errno to separate them from the libc errno.  This allows -fno-common
  72 # in KBUILD_CFLAGS.  Otherwise, it would cause ld to complain about the two different
  73 # errnos.
  74 # These apply to kernelspace only.
  75 #
  76 # strip leading and trailing whitespace to make the USER_CFLAGS removal of these
  77 # defines more robust
  78
  79 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
  80                          -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
  81 KBUILD_CFLAGS += $(KERNEL_DEFINES)
  82
  83 PHONY += linux
  84
  85 all: linux
  86
  87 linux: vmlinux
  88         @echo '  LINK $@'
  89         $(Q)ln -f $< $@
  90
  91 define archhelp
  92   echo '* linux         - Binary kernel image (./linux) - for backward'
  93   echo '                   compatibility only, this creates a hard link to the'
  94   echo '                   real kernel binary, the "vmlinux" binary you'
  95   echo '                   find in the kernel root.'
  96 endef
  97
  98 KBUILD_KCONFIG := $(HOST_DIR)/um/Kconfig
  99
 100 archheaders:
 101         $(Q)$(MAKE) -C '$(srctree)' KBUILD_SRC= \
 102                 ARCH=$(SUBARCH) O='$(objtree)' archheaders
 103
 104 archprepare: include/generated/user_constants.h
 105
 106 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
 107 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
 108
 109 CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
 110         $(call cc-option, -fno-stack-protector,) \
 111         $(call cc-option, -fno-stack-protector-all,)
 112
 113 # Options used by linker script
 114 export LDS_START      := $(START)
 115 export LDS_ELF_ARCH   := $(ELF_ARCH)
 116 export LDS_ELF_FORMAT := $(ELF_FORMAT)
 117
 118 # The wrappers will select whether using "malloc" or the kernel allocator.
 119 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
 120
 121 LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
 122
 123 CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
 124 define 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
 131 endef
 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.
 135 CLEAN_FILES += linux x.i gmon.out
 136
 137 archclean:
 138         @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
 139                 -o -name '*.gcov' \) -type f -print | xargs rm -f
 140
 141 # Generated files
 142
 143 $(HOST_DIR)/um/user-offsets.s: __headers FORCE
 144         $(Q)$(MAKE) $(build)=$(HOST_DIR)/um $@
 145
 146 define filechk_gen-asm-offsets
 147         (set -e; \
 148          echo "/*"; \
 149          echo " * DO NOT MODIFY."; \
 150          echo " *"; \
 151          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 152          echo " *"; \
 153          echo " */"; \
 154          echo ""; \
 155          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 156          echo ""; )
 157 endef
 158
 159 include/generated/user_constants.h: $(HOST_DIR)/um/user-offsets.s
 160         $(call filechk,gen-asm-offsets)
 161
 162 export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH