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