LXR linux/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
   9ARCH_DIR := arch/um
  10OS := $(shell uname -s)
  11# We require bash because the vmlinux link and loader script cpp use bash
  12# features.
  13SHELL := /bin/bash
  14
  15filechk_gen_header = $<
  16
  17core-y                  += $(ARCH_DIR)/kernel/          \
  18                           $(ARCH_DIR)/drivers/         \
  19                           $(ARCH_DIR)/os-$(OS)/
  20
  21MODE_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
  22
  23include $(srctree)/$(ARCH_DIR)/Makefile-skas
  24
  25SHARED_HEADERS  := $(ARCH_DIR)/include/shared
  26ARCH_INCLUDE    := -I$(srctree)/$(SHARED_HEADERS)
  27ARCH_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/sys-$(SUBARCH)/shared
  28ifneq ($(KBUILD_SRC),)
  29ARCH_INCLUDE    += -I$(SHARED_HEADERS)
  30endif
  31KBUILD_CPPFLAGS += -I$(srctree)/$(ARCH_DIR)/sys-$(SUBARCH)
  32
  33# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
  34# named - it's a common symbol in libpcap, so we get a binary which crashes.
  35#
  36# Same things for in6addr_loopback and mktime - found in libc. For these two we
  37# only get link-time error, luckily.
  38#
  39# These apply to USER_CFLAGS to.
  40
  41KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\" \
  42        $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap      \
  43        -Din6addr_loopback=kernel_in6addr_loopback \
  44        -Din6addr_any=kernel_in6addr_any
  45
  46KBUILD_AFLAGS += $(ARCH_INCLUDE)
  47
  48USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -D__KERNEL__,,\
  49        $(patsubst -I%,,$(KBUILD_CFLAGS)))) $(ARCH_INCLUDE) $(MODE_INCLUDE) \
  50        $(filter -I%,$(CFLAGS)) -D_FILE_OFFSET_BITS=64
  51
  52include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
  53
  54#This will adjust *FLAGS accordingly to the platform.
  55include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
  56
  57KBUILD_CPPFLAGS += -I$(srctree)/arch/$(HEADER_ARCH)/include
  58
  59# -Derrno=kernel_errno - This turns all kernel references to errno into
  60# kernel_errno to separate them from the libc errno.  This allows -fno-common
  61# in KBUILD_CFLAGS.  Otherwise, it would cause ld to complain about the two different
  62# errnos.
  63# These apply to kernelspace only.
  64#
  65# strip leading and trailing whitespace to make the USER_CFLAGS removal of these
  66# defines more robust
  67
  68KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
  69                         -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
  70KBUILD_CFLAGS += $(KERNEL_DEFINES)
  71
  72PHONY += linux
  73
  74all: linux
  75
  76linux: vmlinux
  77        @echo '  LINK $@'
  78        $(Q)ln -f $< $@
  79
  80define archhelp
  81  echo '* linux         - Binary kernel image (./linux) - for backward'
  82  echo '                   compatibility only, this creates a hard link to the'
  83  echo '                   real kernel binary, the "vmlinux" binary you'
  84  echo '                   find in the kernel root.'
  85endef
  86
  87KBUILD_KCONFIG := arch/um/Kconfig.$(HEADER_ARCH)
  88
  89archprepare: $(SHARED_HEADERS)/user_constants.h
  90archprepare: $(SHARED_HEADERS)/kern_constants.h
  91
  92LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
  93LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
  94
  95CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
  96        $(call cc-option, -fno-stack-protector,) \
  97        $(call cc-option, -fno-stack-protector-all,)
  98
  99CONFIG_KERNEL_STACK_ORDER ?= 2
 100STACK_SIZE := $(shell echo $$[ 4096 * (1 << $(CONFIG_KERNEL_STACK_ORDER)) ] )
 101
 102CPPFLAGS_vmlinux.lds = -U$(SUBARCH) -DSTART=$(START) -DELF_ARCH=$(ELF_ARCH) \
 103        -DELF_FORMAT="$(ELF_FORMAT)" -DKERNEL_STACK_SIZE=$(STACK_SIZE)
 104
 105# The wrappers will select whether using "malloc" or the kernel allocator.
 106LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
 107
 108LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
 109
 110CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
 111define cmd_vmlinux__
 112        $(CC) $(CFLAGS_vmlinux) -o $@ \
 113        -Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
 114        -Wl,--start-group $(vmlinux-main) -Wl,--end-group \
 115        -lutil \
 116        $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o \
 117        FORCE ,$^) ; rm -f linux
 118endef
 119
 120# When cleaning we don't include .config, so we don't include
 121# TT or skas makefiles and don't clean skas_ptregs.h.
 122CLEAN_FILES += linux x.i gmon.out \
 123        $(SHARED_HEADERS)/user_constants.h \
 124        $(SHARED_HEADERS)/kern_constants.h
 125
 126archclean:
 127        @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
 128                -o -name '*.gcov' \) -type f -print | xargs rm -f
 129
 130# Generated files
 131
 132$(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s: FORCE
 133        $(Q)$(MAKE) $(build)=$(ARCH_DIR)/sys-$(SUBARCH) $@
 134
 135define filechk_gen-asm-offsets
 136        (set -e; \
 137         echo "/*"; \
 138         echo " * DO NOT MODIFY."; \
 139         echo " *"; \
 140         echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 141         echo " *"; \
 142         echo " */"; \
 143         echo ""; \
 144         sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 145         echo ""; )
 146endef
 147
 148$(SHARED_HEADERS)/user_constants.h: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s
 149        $(call filechk,gen-asm-offsets)
 150
 151$(SHARED_HEADERS)/kern_constants.h:
 152        $(Q)mkdir -p $(dir $@)
 153        $(Q)echo '#include "../../../../include/asm/asm-offsets.h"' >$@
 154
 155export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS HEADER_ARCH DEV_NULL_PATH
 156