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
23HEADER_ARCH 	:= $(SUBARCH)
24
25# Additional ARCH settings for x86
26ifeq ($(SUBARCH),i386)
27        HEADER_ARCH := x86
28endif
29ifeq ($(SUBARCH),x86_64)
30        HEADER_ARCH := x86
31	KBUILD_CFLAGS += -mcmodel=large
32endif
33
34HOST_DIR := arch/$(HEADER_ARCH)
35
36include $(srctree)/$(ARCH_DIR)/Makefile-skas
37include $(srctree)/$(HOST_DIR)/Makefile.um
38
39core-y += $(HOST_DIR)/um/
40
41SHARED_HEADERS	:= $(ARCH_DIR)/include/shared
42ARCH_INCLUDE	:= -I$(srctree)/$(SHARED_HEADERS)
43ARCH_INCLUDE	+= -I$(srctree)/$(HOST_DIR)/um/shared
44KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
45
46# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
47# named - it's a common symbol in libpcap, so we get a binary which crashes.
48#
49# Same things for in6addr_loopback and mktime - found in libc. For these two we
50# only get link-time error, luckily.
51#
52# These apply to USER_CFLAGS to.
53
54KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
55	$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap	\
56	-Din6addr_loopback=kernel_in6addr_loopback \
57	-Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
58
59KBUILD_AFLAGS += $(ARCH_INCLUDE)
60
61USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -D__KERNEL__,,\
62	$(patsubst -I%,,$(KBUILD_CFLAGS)))) $(ARCH_INCLUDE) $(MODE_INCLUDE) \
63	$(filter -I%,$(CFLAGS)) -D_FILE_OFFSET_BITS=64 -idirafter include
64
65#This will adjust *FLAGS accordingly to the platform.
66include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
67
68KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
69		   -I$(HOST_DIR)/include/generated
70
71# -Derrno=kernel_errno - This turns all kernel references to errno into
72# kernel_errno to separate them from the libc errno.  This allows -fno-common
73# in KBUILD_CFLAGS.  Otherwise, it would cause ld to complain about the two different
74# errnos.
75# These apply to kernelspace only.
76#
77# strip leading and trailing whitespace to make the USER_CFLAGS removal of these
78# defines more robust
79
80KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
81			 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
82KBUILD_CFLAGS += $(KERNEL_DEFINES)
83
84PHONY += linux
85
86all: linux
87
88linux: vmlinux
89	@echo '  LINK $@'
90	$(Q)ln -f $< $@
91
92define archhelp
93  echo '* linux		- Binary kernel image (./linux) - for backward'
94  echo '		   compatibility only, this creates a hard link to the'
95  echo '		   real kernel binary, the "vmlinux" binary you'
96  echo '		   find in the kernel root.'
97endef
98
99KBUILD_KCONFIG := $(HOST_DIR)/um/Kconfig
100
101archheaders:
102	$(Q)$(MAKE) -C '$(srctree)' KBUILD_SRC= \
103		ARCH=$(HEADER_ARCH) O='$(objtree)' archheaders
104
105archprepare: include/generated/user_constants.h
106
107LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
108LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
109
110CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
111	$(call cc-option, -fno-stack-protector,) \
112	$(call cc-option, -fno-stack-protector-all,)
113
114# Options used by linker script
115export LDS_START      := $(START)
116export LDS_ELF_ARCH   := $(ELF_ARCH)
117export LDS_ELF_FORMAT := $(ELF_FORMAT)
118
119# The wrappers will select whether using "malloc" or the kernel allocator.
120LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
121
122LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
123
124CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
125define cmd_vmlinux__
126	$(CC) $(CFLAGS_vmlinux) -o $@ \
127	-Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
128	-Wl,--start-group $(vmlinux-main) -Wl,--end-group \
129	-lutil \
130	$(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o \
131	FORCE ,$^) ; rm -f linux
132endef
133
134# When cleaning we don't include .config, so we don't include
135# TT or skas makefiles and don't clean skas_ptregs.h.
136CLEAN_FILES += linux x.i gmon.out
137
138archclean:
139	@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
140		-o -name '*.gcov' \) -type f -print | xargs rm -f
141
142# Generated files
143
144$(HOST_DIR)/um/user-offsets.s: __headers FORCE
145	$(Q)$(MAKE) $(build)=$(HOST_DIR)/um $@
146
147define filechk_gen-asm-offsets
148        (set -e; \
149         echo "/*"; \
150         echo " * DO NOT MODIFY."; \
151         echo " *"; \
152         echo " * This file was generated by arch/$(ARCH)/Makefile"; \
153         echo " *"; \
154         echo " */"; \
155         echo ""; \
156         sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
157         echo ""; )
158endef
159
160include/generated/user_constants.h: $(HOST_DIR)/um/user-offsets.s
161	$(call filechk,gen-asm-offsets)
162
163export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH
164