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# select defconfig based on actual architecture
 10ifeq ($(SUBARCH),x86)
 11  ifeq ($(shell uname -m),x86_64)
 12        KBUILD_DEFCONFIG := x86_64_defconfig
 13  else
 14        KBUILD_DEFCONFIG := i386_defconfig
 15  endif
 16else
 17        KBUILD_DEFCONFIG := $(SUBARCH)_defconfig
 18endif
 19
 20ARCH_DIR := arch/um
 21# We require bash because the vmlinux link and loader script cpp use bash
 22# features.
 23SHELL := bash
 24
 25MODE_INCLUDE	+= -I$(srctree)/$(ARCH_DIR)/include/shared/skas
 26
 27HEADER_ARCH 	:= $(SUBARCH)
 28
 29ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
 30	HEADER_ARCH := x86
 31endif
 32
 33ifdef CONFIG_64BIT
 34	KBUILD_CFLAGS += -mcmodel=large
 35endif
 36
 37HOST_DIR := arch/$(HEADER_ARCH)
 38
 39include $(srctree)/$(ARCH_DIR)/Makefile-skas
 40include $(srctree)/$(HOST_DIR)/Makefile.um
 41
 42core-y += $(HOST_DIR)/um/
 43
 44SHARED_HEADERS	:= $(ARCH_DIR)/include/shared
 45ARCH_INCLUDE	:= -I$(srctree)/$(SHARED_HEADERS)
 46ARCH_INCLUDE	+= -I$(srctree)/$(HOST_DIR)/um/shared
 47KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
 48
 49# -Dstrrchr=kernel_strrchr (as well as the various in6addr symbols) prevents
 50#  anything from referencing
 51# libc symbols with the same name, which can cause a linker error.
 52#
 53# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
 54# embedded copy of longjmp, same thing for setjmp.
 55#
 56# These apply to USER_CFLAGS too.
 57
 58KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
 59	$(ARCH_INCLUDE) $(MODE_INCLUDE)	\
 60	-Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
 61	-Din6addr_loopback=kernel_in6addr_loopback \
 62	-Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr \
 63	-D__close_range=kernel__close_range
 64
 65KBUILD_RUSTFLAGS += -Crelocation-model=pie
 66
 67KBUILD_AFLAGS += $(ARCH_INCLUDE)
 68
 69USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
 70		$(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \
 71		-D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \
 72		-idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__ \
 73		-include $(srctree)/include/linux/compiler-version.h \
 74		-include $(srctree)/include/linux/kconfig.h
 75
 76#This will adjust *FLAGS accordingly to the platform.
 77include $(srctree)/$(ARCH_DIR)/Makefile-os-Linux
 78
 79KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
 80		   -I$(srctree)/$(HOST_DIR)/include/uapi \
 81		   -I$(objtree)/$(HOST_DIR)/include/generated \
 82		   -I$(objtree)/$(HOST_DIR)/include/generated/uapi
 83
 84# -Derrno=kernel_errno - This turns all kernel references to errno into
 85# kernel_errno to separate them from the libc errno.  This allows -fno-common
 86# in KBUILD_CFLAGS.  Otherwise, it would cause ld to complain about the two different
 87# errnos.
 88# These apply to kernelspace only.
 89#
 90# strip leading and trailing whitespace to make the USER_CFLAGS removal of these
 91# defines more robust
 92
 93KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
 94			 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
 95KBUILD_CFLAGS += $(KERNEL_DEFINES)
 96
 97PHONY += linux
 98
 99all: linux
100
101linux: vmlinux
102	@echo '  LINK $@'
103	$(Q)ln -f $< $@
104
105define archhelp
106  echo '* linux		- Binary kernel image (./linux) - for backward'
107  echo '		   compatibility only, this creates a hard link to the'
108  echo '		   real kernel binary, the "vmlinux" binary you'
109  echo '		   find in the kernel root.'
110endef
111
112archheaders:
113	$(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders
114
115archprepare:
116	$(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h
117
118LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
119LINK-$(CONFIG_LD_SCRIPT_DYN) += -no-pie
120LINK-$(CONFIG_LD_SCRIPT_DYN_RPATH) += -Wl,-rpath,/lib
121
122CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
123	-fno-stack-protector $(call cc-option, -fno-stack-protector-all)
124
125# Options used by linker script
126export LDS_START      := $(START)
127export LDS_ELF_ARCH   := $(ELF_ARCH)
128export LDS_ELF_FORMAT := $(ELF_FORMAT)
129
130# The wrappers will select whether using "malloc" or the kernel allocator.
131LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
132
133# Avoid binutils 2.39+ warnings by marking the stack non-executable and
134# ignorning warnings for the kallsyms sections.
135LDFLAGS_EXECSTACK = -z noexecstack
136ifeq ($(CONFIG_LD_IS_BFD),y)
137LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments)
138endif
139
140LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS) $(LDFLAGS_EXECSTACK),-Wl,$(opt))
141
142# Used by link-vmlinux.sh which has special support for um link
143export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE) $(CC_FLAGS_LTO)
144
145# When cleaning we don't include .config, so we don't include
146# TT or skas makefiles and don't clean skas_ptregs.h.
147CLEAN_FILES += linux x.i gmon.out
148MRPROPER_FILES += $(HOST_DIR)/include/generated
149
150archclean:
151	@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
152		-o -name '*.gcov' \) -type f -print | xargs rm -f
153	$(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) clean
154
155export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING DEV_NULL_PATH