xref: /openbmc/linux/arch/um/Makefile (revision 93d90ad7) 
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
26filechk_gen_header = $<
27
28core-y			+= $(ARCH_DIR)/kernel/		\
29			   $(ARCH_DIR)/drivers/		\
30			   $(ARCH_DIR)/os-$(OS)/
31
32MODE_INCLUDE	+= -I$(srctree)/$(ARCH_DIR)/include/shared/skas
33
34HEADER_ARCH 	:= $(SUBARCH)
35
36ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
37	HEADER_ARCH := x86
38endif
39
40ifdef CONFIG_64BIT
41	KBUILD_CFLAGS += -mcmodel=large
42endif
43
44HOST_DIR := arch/$(HEADER_ARCH)
45
46include $(srctree)/$(ARCH_DIR)/Makefile-skas
47include $(srctree)/$(HOST_DIR)/Makefile.um
48
49core-y += $(HOST_DIR)/um/
50
51SHARED_HEADERS	:= $(ARCH_DIR)/include/shared
52ARCH_INCLUDE	:= -I$(srctree)/$(SHARED_HEADERS)
53ARCH_INCLUDE	+= -I$(srctree)/$(HOST_DIR)/um/shared
54KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
55
56# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
57# named - it's a common symbol in libpcap, so we get a binary which crashes.
58#
59# Same things for in6addr_loopback and mktime - found in libc. For these two we
60# only get link-time error, luckily.
61#
62# These apply to USER_CFLAGS to.
63
64KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
65	$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap	\
66	-Din6addr_loopback=kernel_in6addr_loopback \
67	-Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
68
69KBUILD_AFLAGS += $(ARCH_INCLUDE)
70
71USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -D__KERNEL__,,\
72	$(patsubst -I%,,$(KBUILD_CFLAGS)))) $(ARCH_INCLUDE) $(MODE_INCLUDE) \
73	$(filter -I%,$(CFLAGS)) -D_FILE_OFFSET_BITS=64 -idirafter include
74
75#This will adjust *FLAGS accordingly to the platform.
76include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
77
78KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
79		   -I$(srctree)/$(HOST_DIR)/include/uapi \
80		   -I$(HOST_DIR)/include/generated \
81		   -I$(HOST_DIR)/include/generated/uapi
82
83# -Derrno=kernel_errno - This turns all kernel references to errno into
84# kernel_errno to separate them from the libc errno.  This allows -fno-common
85# in KBUILD_CFLAGS.  Otherwise, it would cause ld to complain about the two different
86# errnos.
87# These apply to kernelspace only.
88#
89# strip leading and trailing whitespace to make the USER_CFLAGS removal of these
90# defines more robust
91
92KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
93			 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
94KBUILD_CFLAGS += $(KERNEL_DEFINES)
95
96PHONY += linux
97
98all: linux
99
100linux: vmlinux
101	@echo '  LINK $@'
102	$(Q)ln -f $< $@
103
104define archhelp
105  echo '* linux		- Binary kernel image (./linux) - for backward'
106  echo '		   compatibility only, this creates a hard link to the'
107  echo '		   real kernel binary, the "vmlinux" binary you'
108  echo '		   find in the kernel root.'
109endef
110
111KBUILD_KCONFIG := $(HOST_DIR)/um/Kconfig
112
113archheaders:
114	$(Q)$(MAKE) KBUILD_SRC= ARCH=$(HEADER_ARCH) archheaders
115
116archprepare: include/generated/user_constants.h
117
118LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
119LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
120
121CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
122	$(call cc-option, -fno-stack-protector,) \
123	$(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
133LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
134
135# Used by link-vmlinux.sh which has special support for um link
136export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
137
138# When cleaning we don't include .config, so we don't include
139# TT or skas makefiles and don't clean skas_ptregs.h.
140CLEAN_FILES += linux x.i gmon.out
141
142archclean:
143	@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
144		-o -name '*.gcov' \) -type f -print | xargs rm -f
145
146# Generated files
147
148$(HOST_DIR)/um/user-offsets.s: __headers FORCE
149	$(Q)$(MAKE) $(build)=$(HOST_DIR)/um $@
150
151define filechk_gen-asm-offsets
152        (set -e; \
153         echo "/*"; \
154         echo " * DO NOT MODIFY."; \
155         echo " *"; \
156         echo " * This file was generated by arch/$(ARCH)/Makefile"; \
157         echo " *"; \
158         echo " */"; \
159         echo ""; \
160         sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
161         echo ""; )
162endef
163
164include/generated/user_constants.h: $(HOST_DIR)/um/user-offsets.s
165	$(call filechk,gen-asm-offsets)
166
167export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH
168