#
  # This file is included by the global makefile so that you can add your own
  # architecture-specific flags and dependencies.
  #
  # Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  # Licensed under the GPL
  #
  
  # select defconfig based on actual architecture
  ifeq ($(SUBARCH),x86)
    ifeq ($(shell uname -m),x86_64)
          KBUILD_DEFCONFIG := x86_64_defconfig
    else
          KBUILD_DEFCONFIG := i386_defconfig
    endif
  else
          KBUILD_DEFCONFIG := $(SUBARCH)_defconfig
  endif
  
  ARCH_DIR := arch/um
  OS := $(shell uname -s)
  # We require bash because the vmlinux link and loader script cpp use bash
  # features.
  SHELL := /bin/bash
  
  filechk_gen_header = $<
  
  core-y			+= $(ARCH_DIR)/kernel/		\
  			   $(ARCH_DIR)/drivers/		\
  			   $(ARCH_DIR)/os-$(OS)/
  
  MODE_INCLUDE	+= -I$(srctree)/$(ARCH_DIR)/include/shared/skas
  
  HEADER_ARCH 	:= $(SUBARCH)
  
  ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
  	HEADER_ARCH := x86
  endif
  
  ifdef CONFIG_64BIT
  	KBUILD_CFLAGS += -mcmodel=large
  endif
  
  HOST_DIR := arch/$(HEADER_ARCH)
  
  include $(ARCH_DIR)/Makefile-skas
  include $(HOST_DIR)/Makefile.um
  
  core-y += $(HOST_DIR)/um/
  
  SHARED_HEADERS	:= $(ARCH_DIR)/include/shared
  ARCH_INCLUDE	:= -I$(srctree)/$(SHARED_HEADERS)
  ARCH_INCLUDE	+= -I$(srctree)/$(HOST_DIR)/um/shared
  KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
  
  # -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
  # named - it's a common symbol in libpcap, so we get a binary which crashes.
  #
  # Same things for in6addr_loopback and mktime - found in libc. For these two we
  # only get link-time error, luckily.
  #
  # -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
  # embedded copy of longjmp, same thing for setjmp.
  #
  # These apply to USER_CFLAGS to.
  
  KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
  	$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap	\
  	-Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
  	-Din6addr_loopback=kernel_in6addr_loopback \
  	-Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
  
  KBUILD_AFLAGS += $(ARCH_INCLUDE)
  
  USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
  		$(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \
  		-D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \
  		-idirafter $(obj)/include -D__KERNEL__ -D__UM_HOST__
  
  #This will adjust *FLAGS accordingly to the platform.
  include $(ARCH_DIR)/Makefile-os-$(OS)
  
  KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
  		   -I$(srctree)/$(HOST_DIR)/include/uapi \
  		   -I$(objtree)/$(HOST_DIR)/include/generated \
  		   -I$(objtree)/$(HOST_DIR)/include/generated/uapi
  
  # -Derrno=kernel_errno - This turns all kernel references to errno into
  # kernel_errno to separate them from the libc errno.  This allows -fno-common
  # in KBUILD_CFLAGS.  Otherwise, it would cause ld to complain about the two different
  # errnos.
  # These apply to kernelspace only.
  #
  # strip leading and trailing whitespace to make the USER_CFLAGS removal of these
  # defines more robust
  
  KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
  			 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
  KBUILD_CFLAGS += $(KERNEL_DEFINES)
  
  PHONY += linux
  
  all: linux
  
  linux: vmlinux
  	@echo '  LINK $@'
  	$(Q)ln -f $< $@
  
  define archhelp
    echo '* linux		- Binary kernel image (./linux) - for backward'
    echo '		   compatibility only, this creates a hard link to the'
    echo '		   real kernel binary, the "vmlinux" binary you'
    echo '		   find in the kernel root.'
  endef
  
  KBUILD_KCONFIG := $(HOST_DIR)/um/Kconfig
  
  archheaders:
  	$(Q)$(MAKE) KBUILD_SRC= ARCH=$(HEADER_ARCH) archheaders
  
  archprepare: include/generated/user_constants.h
  
  LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
  LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib $(call cc-option, -no-pie)
  
  CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
  	$(call cc-option, -fno-stack-protector,) \
  	$(call cc-option, -fno-stack-protector-all,)
  
  # Options used by linker script
  export LDS_START      := $(START)
  export LDS_ELF_ARCH   := $(ELF_ARCH)
  export LDS_ELF_FORMAT := $(ELF_FORMAT)
  
  # The wrappers will select whether using "malloc" or the kernel allocator.
  LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
  
  LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
  
  # Used by link-vmlinux.sh which has special support for um link
  export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
  
  # When cleaning we don't include .config, so we don't include
  # TT or skas makefiles and don't clean skas_ptregs.h.
  CLEAN_FILES += linux x.i gmon.out
  
  archclean:
  	@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
  		-o -name '*.gcov' \) -type f -print | xargs rm -f
  
  # Generated files
  
  $(HOST_DIR)/um/user-offsets.s: __headers FORCE
  	$(Q)$(MAKE) $(build)=$(HOST_DIR)/um $@
  
  define filechk_gen-asm-offsets
          (set -e; \
           echo "/*"; \
           echo " * DO NOT MODIFY."; \
           echo " *"; \
           echo " * This file was generated by arch/$(ARCH)/Makefile"; \
           echo " *"; \
           echo " */"; \
           echo ""; \
           sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
           echo ""; )
  endef
  
  include/generated/user_constants.h: $(HOST_DIR)/um/user-offsets.s
  	$(call filechk,gen-asm-offsets)
  
  export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH