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
99# Options used by linker script
100export LDS_START      := $(START)
101export LDS_ELF_ARCH   := $(ELF_ARCH)
102export LDS_ELF_FORMAT := $(ELF_FORMAT)
103
104# The wrappers will select whether using "malloc" or the kernel allocator.
105LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
106
107LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
108
109CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
110define cmd_vmlinux__
111	$(CC) $(CFLAGS_vmlinux) -o $@ \
112	-Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
113	-Wl,--start-group $(vmlinux-main) -Wl,--end-group \
114	-lutil \
115	$(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o \
116	FORCE ,$^) ; rm -f linux
117endef
118
119# When cleaning we don't include .config, so we don't include
120# TT or skas makefiles and don't clean skas_ptregs.h.
121CLEAN_FILES += linux x.i gmon.out \
122	$(SHARED_HEADERS)/user_constants.h \
123	$(SHARED_HEADERS)/kern_constants.h
124
125archclean:
126	@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
127		-o -name '*.gcov' \) -type f -print | xargs rm -f
128
129# Generated files
130
131$(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s: FORCE
132	$(Q)$(MAKE) $(build)=$(ARCH_DIR)/sys-$(SUBARCH) $@
133
134define filechk_gen-asm-offsets
135        (set -e; \
136         echo "/*"; \
137         echo " * DO NOT MODIFY."; \
138         echo " *"; \
139         echo " * This file was generated by arch/$(ARCH)/Makefile"; \
140         echo " *"; \
141         echo " */"; \
142         echo ""; \
143         sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
144         echo ""; )
145endef
146
147$(SHARED_HEADERS)/user_constants.h: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s
148	$(call filechk,gen-asm-offsets)
149
150$(SHARED_HEADERS)/kern_constants.h:
151	$(Q)mkdir -p $(dir $@)
152	$(Q)echo '#include "../../../../include/generated/asm-offsets.h"' >$@
153
154export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS HEADER_ARCH DEV_NULL_PATH
155