projects/linux·blob master · refs

156 lines · 5.1 KiB

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 := $(SUBARCH)_defconfig
18endif
19
20ARCH_DIR := arch/um
21# We require bash because the vmlinux link and loader script cpp use bash
22# features.
23SHELL := bash
24
25MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
26
27HEADER_ARCH := $(SUBARCH)
28
29ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
30 HEADER_ARCH := x86
31endif
32
33ifdef CONFIG_64BIT
34 KBUILD_CFLAGS += -mcmodel=large
35endif
36
37HOST_DIR := arch/$(HEADER_ARCH)
38
39include $(srctree)/$(ARCH_DIR)/Makefile-skas
40include $(srctree)/$(HOST_DIR)/Makefile.um
41
42core-y += $(HOST_DIR)/um/
43
44SHARED_HEADERS := $(ARCH_DIR)/include/shared
45ARCH_INCLUDE := -I$(srctree)/$(SHARED_HEADERS)
46ARCH_INCLUDE += -I$(srctree)/$(HOST_DIR)/um/shared
47KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
48
49# -Dstrrchr=kernel_strrchr (as well as the various in6addr symbols) prevents
50# anything from referencing
51# libc symbols with the same name, which can cause a linker error.
52#
53# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
54# embedded copy of longjmp, same thing for setjmp.
55#
56# These apply to USER_CFLAGS too.
57
58KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
59 $(ARCH_INCLUDE) $(MODE_INCLUDE) \
60 -Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
61 -Din6addr_loopback=kernel_in6addr_loopback \
62 -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr \
63 -D__close_range=kernel__close_range
64
65KBUILD_RUSTFLAGS += -Crelocation-model=pie
66
67KBUILD_AFLAGS += $(ARCH_INCLUDE)
68
69USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
70 $(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \
71 -D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \
72 -idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__ \
73 -include $(srctree)/include/linux/compiler-version.h \
74 -include $(srctree)/include/linux/kconfig.h \
75 -idirafter $(ARCH_DIR)/include/generated
76
77#This will adjust *FLAGS accordingly to the platform.
78include $(srctree)/$(ARCH_DIR)/Makefile-os-Linux
79
80KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
81 -I$(srctree)/$(HOST_DIR)/include/uapi \
82 -I$(objtree)/$(HOST_DIR)/include/generated \
83 -I$(objtree)/$(HOST_DIR)/include/generated/uapi
84
85# -Derrno=kernel_errno - This turns all kernel references to errno into
86# kernel_errno to separate them from the libc errno. This allows -fno-common
87# in KBUILD_CFLAGS. Otherwise, it would cause ld to complain about the two different
88# errnos.
89# These apply to kernelspace only.
90#
91# strip leading and trailing whitespace to make the USER_CFLAGS removal of these
92# defines more robust
93
94KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
95 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
96KBUILD_CFLAGS += $(KERNEL_DEFINES)
97
98PHONY += linux
99
100all: linux
101
102linux: vmlinux
103 @echo ' LINK $@'
104 $(Q)ln -f $< $@
105
106define archhelp
107 echo '* linux - Binary kernel image (./linux) - for backward'
108 echo ' compatibility only, this creates a hard link to the'
109 echo ' real kernel binary, the "vmlinux" binary you'
110 echo ' find in the kernel root.'
111endef
112
113archheaders:
114 $(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders
115
116archprepare:
117 $(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h
118
119LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
120LINK-$(CONFIG_LD_SCRIPT_DYN) += -no-pie
121LINK-$(CONFIG_LD_SCRIPT_DYN_RPATH) += -Wl,-rpath,/lib
122
123CFLAGS_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
127export LDS_START := $(START)
128export LDS_ELF_ARCH := $(ELF_ARCH)
129export LDS_ELF_FORMAT := $(ELF_FORMAT)
130
131# The wrappers will select whether using "malloc" or the kernel allocator.
132LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
133
134# Avoid binutils 2.39+ warnings by marking the stack non-executable and
135# ignorning warnings for the kallsyms sections.
136LDFLAGS_EXECSTACK = -z noexecstack
137ifeq ($(CONFIG_LD_IS_BFD),y)
138LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments)
139endif
140
141LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS) $(LDFLAGS_EXECSTACK),-Wl,$(opt))
142
143# Used by link-vmlinux.sh which has special support for um link
144export 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.
148CLEAN_FILES += linux x.i gmon.out
149MRPROPER_FILES += $(HOST_DIR)/include/generated
150
151archclean:
152 @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
153 -o -name '*.gcov' \) -type f -print | xargs rm -f
154 $(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) clean
155
156export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING DEV_NULL_PATH