xref: /openbmc/linux/arch/um/Makefile (revision cb8aa3d2) 
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 Jeff Dike (jdike@karaya.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
21# Have to precede the include because the included Makefiles reference them.
22SYMLINK_HEADERS := archparam.h system.h sigcontext.h processor.h ptrace.h \
23	module.h vm-flags.h elf.h host_ldt.h
24SYMLINK_HEADERS := $(foreach header,$(SYMLINK_HEADERS),include/asm-um/$(header))
25
26# XXX: The "os" symlink is only used by arch/um/include/os.h, which includes
27# ../os/include/file.h
28#
29# These are cleaned up during mrproper. Please DO NOT fix it again, this is
30# the Correct Thing(tm) to do!
31ARCH_SYMLINKS = include/asm-um/arch $(ARCH_DIR)/include/sysdep $(ARCH_DIR)/os \
32	$(SYMLINK_HEADERS) $(ARCH_DIR)/include/uml-config.h
33
34um-modes-$(CONFIG_MODE_TT) += tt
35um-modes-$(CONFIG_MODE_SKAS) += skas
36
37MODE_INCLUDE	+= $(foreach mode,$(um-modes-y),\
38		   -I$(srctree)/$(ARCH_DIR)/include/$(mode))
39
40MAKEFILES-INCL	+= $(foreach mode,$(um-modes-y),\
41		   $(srctree)/$(ARCH_DIR)/Makefile-$(mode))
42
43ifneq ($(MAKEFILES-INCL),)
44  include $(MAKEFILES-INCL)
45endif
46
47ARCH_INCLUDE	:= -I$(ARCH_DIR)/include
48ifneq ($(KBUILD_SRC),)
49ARCH_INCLUDE	+= -I$(srctree)/$(ARCH_DIR)/include
50endif
51SYS_DIR		:= $(ARCH_DIR)/include/sysdep-$(SUBARCH)
52
53# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
54# named - it's a common symbol in libpcap, so we get a binary which crashes.
55#
56# Same things for in6addr_loopback and mktime - found in libc. For these two we
57# only get link-time error, luckily.
58#
59# These apply to USER_CFLAGS to.
60
61CFLAGS += $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\"	\
62	$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap	\
63	-Din6addr_loopback=kernel_in6addr_loopback
64
65AFLAGS += $(ARCH_INCLUDE)
66
67USER_CFLAGS := $(patsubst -I%,,$(CFLAGS))
68USER_CFLAGS := $(patsubst -D__KERNEL__,,$(USER_CFLAGS)) $(ARCH_INCLUDE) \
69	$(MODE_INCLUDE) -D_FILE_OFFSET_BITS=64
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 CFLAGS.  Otherwise, it would cause ld to complain about the two different
74# errnos.
75# These apply to kernelspace only.
76
77CFLAGS += -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
78	-Dmktime=kernel_mktime
79CFLAGS += $(call cc-option,-fno-unit-at-a-time,)
80
81include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
82
83#This will adjust *FLAGS accordingly to the platform.
84include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
85
86# These are needed for clean and mrproper, since in that case .config is not
87# included; the values here are meaningless
88
89CONFIG_NEST_LEVEL ?= 0
90CONFIG_KERNEL_HALF_GIGS ?= 0
91
92SIZE = (($(CONFIG_NEST_LEVEL) + $(CONFIG_KERNEL_HALF_GIGS)) * 0x20000000)
93
94PHONY += linux
95
96all: linux
97
98linux: vmlinux
99	@echo '  SYMLINK $@'
100	$(Q)ln -f $< $@
101
102define archhelp
103  echo '* linux		- Binary kernel image (./linux) - for backward'
104  echo '		   compatibility only, this creates a hard link to the'
105  echo '		   real kernel binary, the the "vmlinux" binary you'
106  echo '		   find in the kernel root.'
107endef
108
109ifneq ($(KBUILD_SRC),)
110$(shell mkdir -p $(ARCH_DIR) && ln -fsn $(srctree)/$(ARCH_DIR)/Kconfig.$(SUBARCH) $(ARCH_DIR)/Kconfig.arch)
111else
112$(shell cd $(ARCH_DIR) && ln -sf Kconfig.$(SUBARCH) Kconfig.arch)
113endif
114
115archprepare: $(ARCH_SYMLINKS) $(ARCH_DIR)/include/user_constants.h
116prepare: $(ARCH_DIR)/include/kern_constants.h
117
118LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
119LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
120
121CPP_MODE-$(CONFIG_MODE_TT) := -DMODE_TT
122CONFIG_KERNEL_STACK_ORDER ?= 2
123STACK_SIZE := $(shell echo $$[ 4096 * (1 << $(CONFIG_KERNEL_STACK_ORDER)) ] )
124
125ifndef START
126  START = $(shell echo $$[ $(TOP_ADDR) - $(SIZE) ] )
127endif
128
129CPPFLAGS_vmlinux.lds = -U$(SUBARCH) \
130	-DSTART=$(START) -DELF_ARCH=$(ELF_ARCH) \
131	-DELF_FORMAT="$(ELF_FORMAT)" $(CPP_MODE-y) \
132	-DKERNEL_STACK_SIZE=$(STACK_SIZE) \
133	-DUNMAP_PATH=arch/um/sys-$(SUBARCH)/unmap.o
134
135#The wrappers will select whether using "malloc" or the kernel allocator.
136LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
137
138CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS)
139define cmd_vmlinux__
140	$(CC) $(CFLAGS_vmlinux) -o $@ \
141	-Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
142	-Wl,--start-group $(vmlinux-main) -Wl,--end-group \
143	-lutil \
144	$(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) \
145	FORCE ,$^) ; rm -f linux
146endef
147
148#When cleaning we don't include .config, so we don't include
149#TT or skas makefiles and don't clean skas_ptregs.h.
150CLEAN_FILES += linux x.i gmon.out $(ARCH_DIR)/include/uml-config.h \
151	$(ARCH_DIR)/include/user_constants.h \
152	$(ARCH_DIR)/include/kern_constants.h $(ARCH_DIR)/Kconfig.arch
153
154MRPROPER_FILES += $(ARCH_SYMLINKS)
155
156archclean:
157	@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
158		-o -name '*.gcov' \) -type f -print | xargs rm -f
159
160$(SYMLINK_HEADERS):
161	@echo '  SYMLINK $@'
162ifneq ($(KBUILD_SRC),)
163	$(Q)mkdir -p $(objtree)/include/asm-um
164	$(Q)ln -fsn $(srctree)/include/asm-um/$(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $@
165else
166	$(Q)cd $(TOPDIR)/$(dir $@) ; \
167	ln -sf $(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $(notdir $@)
168endif
169
170include/asm-um/arch:
171	@echo '  SYMLINK $@'
172ifneq ($(KBUILD_SRC),)
173	$(Q)mkdir -p $(objtree)/include/asm-um
174	$(Q)ln -fsn $(srctree)/include/asm-$(SUBARCH) include/asm-um/arch
175else
176	$(Q)cd $(TOPDIR)/include/asm-um && ln -sf ../asm-$(SUBARCH) arch
177endif
178
179$(objtree)/$(ARCH_DIR)/include:
180	@echo '  MKDIR $@'
181	$(Q)mkdir -p $@
182
183$(ARCH_DIR)/include/sysdep: $(objtree)/$(ARCH_DIR)/include
184	@echo '  SYMLINK $@'
185ifneq ($(KBUILD_SRC),)
186	$(Q)ln -fsn $(srctree)/$(ARCH_DIR)/include/sysdep-$(SUBARCH) $(ARCH_DIR)/include/sysdep
187else
188	$(Q)cd $(ARCH_DIR)/include && ln -sf sysdep-$(SUBARCH) sysdep
189endif
190
191$(ARCH_DIR)/os:
192	@echo '  SYMLINK $@'
193ifneq ($(KBUILD_SRC),)
194	$(Q)ln -fsn $(srctree)/$(ARCH_DIR)/os-$(OS) $(ARCH_DIR)/os
195else
196	$(Q)cd $(ARCH_DIR) && ln -sf os-$(OS) os
197endif
198
199# Generated files
200define filechk_umlconfig
201	sed 's/ CONFIG/ UML_CONFIG/'
202endef
203
204$(ARCH_DIR)/include/uml-config.h : include/linux/autoconf.h
205	$(call filechk,umlconfig)
206
207$(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s: FORCE
208	$(Q)$(MAKE) $(build)=$(ARCH_DIR)/sys-$(SUBARCH) $@
209
210define filechk_gen-asm-offsets
211        (set -e; \
212         echo "/*"; \
213         echo " * DO NOT MODIFY."; \
214         echo " *"; \
215         echo " * This file was generated by arch/$(ARCH)/Makefile"; \
216         echo " *"; \
217         echo " */"; \
218         echo ""; \
219         sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
220         echo ""; )
221endef
222
223$(ARCH_DIR)/include/user_constants.h: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s
224	$(call filechk,gen-asm-offsets)
225
226$(ARCH_DIR)/include/kern_constants.h: $(objtree)/$(ARCH_DIR)/include
227	@echo '  SYMLINK $@'
228	$(Q)ln -sf ../../../include/asm-um/asm-offsets.h $@
229
230export SUBARCH USER_CFLAGS OS
231