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
21OS := $(shell uname -s)
22# We require bash because the vmlinux link and loader script cpp use bash
23# features.
24SHELL := /bin/bash
25
26core-y			+= $(ARCH_DIR)/kernel/		\
27			   $(ARCH_DIR)/drivers/		\
28			   $(ARCH_DIR)/os-$(OS)/
29
30MODE_INCLUDE	+= -I$(srctree)/$(ARCH_DIR)/include/shared/skas
31
32HEADER_ARCH 	:= $(SUBARCH)
33
34ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
35	HEADER_ARCH := x86
36endif
37
38ifdef CONFIG_64BIT
39	KBUILD_CFLAGS += -mcmodel=large
40endif
41
42HOST_DIR := arch/$(HEADER_ARCH)
43
44include $(srctree)/$(ARCH_DIR)/Makefile-skas
45include $(srctree)/$(HOST_DIR)/Makefile.um
46
47core-y += $(HOST_DIR)/um/
48
49SHARED_HEADERS	:= $(ARCH_DIR)/include/shared
50ARCH_INCLUDE	:= -I$(srctree)/$(SHARED_HEADERS)
51ARCH_INCLUDE	+= -I$(srctree)/$(HOST_DIR)/um/shared
52KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
53
54# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
55# named - it's a common symbol in libpcap, so we get a binary which crashes.
56#
57# Same things for in6addr_loopback and mktime - found in libc. For these two we
58# only get link-time error, luckily.
59#
60# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
61# embedded copy of longjmp, same thing for setjmp.
62#
63# These apply to USER_CFLAGS to.
64
65KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
66	$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap	\
67	-Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
68	-Din6addr_loopback=kernel_in6addr_loopback \
69	-Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
70
71KBUILD_AFLAGS += $(ARCH_INCLUDE)
72
73USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
74		$(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \
75		-D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \
76		-idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__
77
78#This will adjust *FLAGS accordingly to the platform.
79include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
80
81KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
82		   -I$(srctree)/$(HOST_DIR)/include/uapi \
83		   -I$(objtree)/$(HOST_DIR)/include/generated \
84		   -I$(objtree)/$(HOST_DIR)/include/generated/uapi
85
86# -Derrno=kernel_errno - This turns all kernel references to errno into
87# kernel_errno to separate them from the libc errno.  This allows -fno-common
88# in KBUILD_CFLAGS.  Otherwise, it would cause ld to complain about the two different
89# errnos.
90# These apply to kernelspace only.
91#
92# strip leading and trailing whitespace to make the USER_CFLAGS removal of these
93# defines more robust
94
95KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
96			 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
97KBUILD_CFLAGS += $(KERNEL_DEFINES)
98
99PHONY += linux
100
101all: linux
102
103linux: vmlinux
104	@echo '  LINK $@'
105	$(Q)ln -f $< $@
106
107define archhelp
108  echo '* linux		- Binary kernel image (./linux) - for backward'
109  echo '		   compatibility only, this creates a hard link to the'
110  echo '		   real kernel binary, the "vmlinux" binary you'
111  echo '		   find in the kernel root.'
112endef
113
114archheaders:
115	$(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders
116
117archprepare:
118	$(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h
119
120LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
121LINK-$(CONFIG_LD_SCRIPT_DYN) += $(call cc-option, -no-pie)
122LINK-$(CONFIG_LD_SCRIPT_DYN_RPATH) += -Wl,-rpath,/lib
123
124CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
125	-fno-stack-protector $(call cc-option, -fno-stack-protector-all)
126
127# Options used by linker script
128export LDS_START      := $(START)
129export LDS_ELF_ARCH   := $(ELF_ARCH)
130export LDS_ELF_FORMAT := $(ELF_FORMAT)
131
132# The wrappers will select whether using "malloc" or the kernel allocator.
133LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
134
135LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS),-Wl,$(opt))
136
137# Used by link-vmlinux.sh which has special support for um link
138export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
139
140# When cleaning we don't include .config, so we don't include
141# TT or skas makefiles and don't clean skas_ptregs.h.
142CLEAN_FILES += linux x.i gmon.out
143MRPROPER_FILES += arch/$(SUBARCH)/include/generated
144
145archclean:
146	@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
147		-o -name '*.gcov' \) -type f -print | xargs rm -f
148
149export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH
150