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 SHARED_HEADERS  := $(ARCH_DIR)/include/shared
  26 ARCH_INCLUDE    := -I$(srctree)/$(SHARED_HEADERS)
  27 ARCH_INCLUDE    += -I$(srctree)/$(ARCH_DIR)/sys-$(SUBARCH)/shared
  28 ifneq ($(KBUILD_SRC),)
  29 ARCH_INCLUDE    += -I$(SHARED_HEADERS)
  30 endif
  31 KBUILD_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
  41 KBUILD_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
  46 KBUILD_AFLAGS += $(ARCH_INCLUDE)
  47
  48 USER_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
  52 include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
  53
  54 #This will adjust *FLAGS accordingly to the platform.
  55 include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
  56
  57 KBUILD_CPPFLAGS += -I$(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
  68 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
  69                          -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
  70 KBUILD_CFLAGS += $(KERNEL_DEFINES)
  71
  72 PHONY += linux
  73
  74 all: linux
  75
  76 linux: vmlinux
  77         @echo '  LINK $@'
  78         $(Q)ln -f $< $@
  79
  80 define archhelp
  81   echo '* linux         - Binary kernel image (./linux) - for backward'
  82   echo '                   compatibility only, this creates a hard link to the'
  83   echo '                   real kernel binary, the "vmlinux" binary you'
  84   echo '                   find in the kernel root.'
  85 endef
  86
  87 KBUILD_KCONFIG := arch/um/Kconfig.$(HEADER_ARCH)
  88
  89 archprepare: $(SHARED_HEADERS)/user_constants.h
  90 archprepare: $(SHARED_HEADERS)/kern_constants.h
  91
  92 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
  93 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
  94
  95 CFLAGS_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
  99 CONFIG_KERNEL_STACK_ORDER ?= 2
 100 STACK_SIZE := $(shell echo $$[ 4096 * (1 << $(CONFIG_KERNEL_STACK_ORDER)) ] )
 101
 102 CPPFLAGS_vmlinux.lds = -U$(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.
 106 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
 107
 108 LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
 109
 110 CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
 111 define 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
 118 endef
 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.
 122 CLEAN_FILES += linux x.i gmon.out \
 123         $(SHARED_HEADERS)/user_constants.h \
 124         $(SHARED_HEADERS)/kern_constants.h
 125
 126 archclean:
 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) $@
 134
 135 define filechk_gen-asm-offsets
 136         (set -e; \
 137          echo "/*"; \
 138          echo " * DO NOT MODIFY."; \
 139          echo " *"; \
 140          echo " * This file was generated by arch/$(ARCH)/Makefile"; \
 141          echo " *"; \
 142          echo " */"; \
 143          echo ""; \
 144          sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
 145          echo ""; )
 146 endef
 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
 155 export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS HEADER_ARCH DEV_NULL_PATH