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
10 ifeq ($(SUBARCH),x86)
11 ifeq ($(shell uname -m),x86_64)
12 KBUILD_DEFCONFIG := x86_64_defconfig
13 else
14 KBUILD_DEFCONFIG := i386_defconfig
15 endif
16 else
17 KBUILD_DEFCONFIG := $(SUBARCH)_defconfig
18 endif
19
20 ARCH_DIR := arch/um
21 # We require bash because the vmlinux link and loader script cpp use bash
22 # features.
23 SHELL := bash
24
25 MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
26
27 HEADER_ARCH := $(SUBARCH)
28
29 ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
30 HEADER_ARCH := x86
31 endif
32
33 ifdef CONFIG_64BIT
34 KBUILD_CFLAGS += -mcmodel=large
35 endif
36
37 HOST_DIR := arch/$(HEADER_ARCH)
38
39 include $(srctree)/$(ARCH_DIR)/Makefile-skas
40 include $(srctree)/$(HOST_DIR)/Makefile.um
41
42 core-y += $(HOST_DIR)/um/
43
44 SHARED_HEADERS := $(ARCH_DIR)/include/shared
45 ARCH_INCLUDE := -I$(srctree)/$(SHARED_HEADERS)
46 ARCH_INCLUDE += -I$(srctree)/$(HOST_DIR)/um/shared
47 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
48
49 # -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
50 # named - it's a common symbol in libpcap, so we get a binary which crashes.
51 #
52 # Same things for in6addr_loopback and mktime - found in libc. For these two we
53 # only get link-time error, luckily.
54 #
55 # -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
56 # embedded copy of longjmp, same thing for setjmp.
57 #
58 # These apply to USER_CFLAGS to.
59
60 KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
61 $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
62 -Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
63 -Din6addr_loopback=kernel_in6addr_loopback \
64 -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
65
66 KBUILD_RUSTFLAGS += -Crelocation-model=pie
67
68 KBUILD_AFLAGS += $(ARCH_INCLUDE)
69
70 USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
71 $(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \
72 -D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \
73 -idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__
74
75 #This will adjust *FLAGS accordingly to the platform.
76 include $(srctree)/$(ARCH_DIR)/Makefile-os-Linux
77
78 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
79 -I$(srctree)/$(HOST_DIR)/include/uapi \
80 -I$(objtree)/$(HOST_DIR)/include/generated \
81 -I$(objtree)/$(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
92 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
93 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
94 KBUILD_CFLAGS += $(KERNEL_DEFINES)
95
96 PHONY += linux
97
98 all: linux
99
100 linux: vmlinux
101 @echo ' LINK $@'
102 $(Q)ln -f $< $@
103
104 define 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.'
109 endef
110
111 archheaders:
112 $(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders
113
114 archprepare:
115 $(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h
116
117 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
118 ifdef CONFIG_LD_SCRIPT_DYN
119 LINK-$(call gcc-min-version, 60100)$(CONFIG_CC_IS_CLANG) += -no-pie
120 endif
121 LINK-$(CONFIG_LD_SCRIPT_DYN_RPATH) += -Wl,-rpath,/lib
122
123 CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
124 -fno-stack-protector $(call cc-option, -fno-stack-protector-all)
125
126 # Options used by linker script
127 export LDS_START := $(START)
128 export LDS_ELF_ARCH := $(ELF_ARCH)
129 export LDS_ELF_FORMAT := $(ELF_FORMAT)
130
131 # The wrappers will select whether using "malloc" or the kernel allocator.
132 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
133
134 # Avoid binutils 2.39+ warnings by marking the stack non-executable and
135 # ignorning warnings for the kallsyms sections.
136 LDFLAGS_EXECSTACK = -z noexecstack
137 ifeq ($(CONFIG_LD_IS_BFD),y)
138 LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments)
139 endif
140
141 LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS) $(LDFLAGS_EXECSTACK),-Wl,$(opt))
142
143 # Used by link-vmlinux.sh which has special support for um link
144 export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE) $(CC_FLAGS_LTO)
145
146 # When cleaning we don't include .config, so we don't include
147 # TT or skas makefiles and don't clean skas_ptregs.h.
148 CLEAN_FILES += linux x.i gmon.out
149 MRPROPER_FILES += $(HOST_DIR)/include/generated
150
151 archclean:
152 @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
153 -o -name '*.gcov' \) -type f -print | xargs rm -f
154
155 export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING DEV_NULL_PATH
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