98105d47d3
While fixing myself the mktime conflict (which someone already merged), I also improved a few comments. Merge them up. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
228 lines
6.9 KiB
Makefile
228 lines
6.9 KiB
Makefile
#
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# Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
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# Licensed under the GPL
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#
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ARCH_DIR := arch/um
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OS := $(shell uname -s)
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# We require bash because the vmlinux link and loader script cpp use bash
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# features.
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SHELL := /bin/bash
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filechk_gen_header = $<
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core-y += $(ARCH_DIR)/kernel/ \
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$(ARCH_DIR)/drivers/ \
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$(ARCH_DIR)/os-$(OS)/
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# Have to precede the include because the included Makefiles reference them.
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SYMLINK_HEADERS := archparam.h system.h sigcontext.h processor.h ptrace.h \
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module.h vm-flags.h elf.h ldt.h
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SYMLINK_HEADERS := $(foreach header,$(SYMLINK_HEADERS),include/asm-um/$(header))
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# XXX: The "os" symlink is only used by arch/um/include/os.h, which includes
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# ../os/include/file.h
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#
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# These are cleaned up during mrproper. Please DO NOT fix it again, this is
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# the Correct Thing(tm) to do!
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ARCH_SYMLINKS = include/asm-um/arch $(ARCH_DIR)/include/sysdep $(ARCH_DIR)/os \
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$(SYMLINK_HEADERS) $(ARCH_DIR)/include/uml-config.h
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um-modes-$(CONFIG_MODE_TT) += tt
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um-modes-$(CONFIG_MODE_SKAS) += skas
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MODE_INCLUDE += $(foreach mode,$(um-modes-y),\
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-I$(srctree)/$(ARCH_DIR)/include/$(mode))
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MAKEFILES-INCL += $(foreach mode,$(um-modes-y),\
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$(srctree)/$(ARCH_DIR)/Makefile-$(mode))
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ifneq ($(MAKEFILES-INCL),)
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include $(MAKEFILES-INCL)
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endif
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ARCH_INCLUDE := -I$(ARCH_DIR)/include
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ifneq ($(KBUILD_SRC),)
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ARCH_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include
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endif
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SYS_DIR := $(ARCH_DIR)/include/sysdep-$(SUBARCH)
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# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
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# named - it's a common symbol in libpcap, so we get a binary which crashes.
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#
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# Same things for in6addr_loopback and mktime - found in libc. For these two we
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# only get link-time error, luckily.
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#
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# These apply to USER_CFLAGS to.
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CFLAGS += $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\" \
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$(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
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-Din6addr_loopback=kernel_in6addr_loopback
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AFLAGS += $(ARCH_INCLUDE)
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USER_CFLAGS := $(patsubst -I%,,$(CFLAGS))
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USER_CFLAGS := $(patsubst -D__KERNEL__,,$(USER_CFLAGS)) $(ARCH_INCLUDE) \
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$(MODE_INCLUDE) -D_FILE_OFFSET_BITS=64
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# -Derrno=kernel_errno - This turns all kernel references to errno into
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# kernel_errno to separate them from the libc errno. This allows -fno-common
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# in CFLAGS. Otherwise, it would cause ld to complain about the two different
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# errnos.
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# These apply to kernelspace only.
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CFLAGS += -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
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-Dmktime=kernel_mktime
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CFLAGS += $(call cc-option,-fno-unit-at-a-time,)
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include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
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#This will adjust *FLAGS accordingly to the platform.
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include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
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# These are needed for clean and mrproper, since in that case .config is not
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# included; the values here are meaningless
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CONFIG_NEST_LEVEL ?= 0
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CONFIG_KERNEL_HALF_GIGS ?= 0
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SIZE = (($(CONFIG_NEST_LEVEL) + $(CONFIG_KERNEL_HALF_GIGS)) * 0x20000000)
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.PHONY: linux
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all: linux
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linux: vmlinux
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ln -f $< $@
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define archhelp
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echo '* linux - Binary kernel image (./linux) - for backward'
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echo ' compatibility only, this creates a hard link to the'
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echo ' real kernel binary, the the "vmlinux" binary you'
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echo ' find in the kernel root.'
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endef
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ifneq ($(KBUILD_SRC),)
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$(shell mkdir -p $(ARCH_DIR) && ln -fsn $(srctree)/$(ARCH_DIR)/Kconfig.$(SUBARCH) $(ARCH_DIR)/Kconfig.arch)
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else
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$(shell cd $(ARCH_DIR) && ln -sf Kconfig.$(SUBARCH) Kconfig.arch)
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endif
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archprepare: $(ARCH_SYMLINKS) $(ARCH_DIR)/include/user_constants.h
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prepare: $(ARCH_DIR)/include/kern_constants.h
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LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
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LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
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CPP_MODE-$(CONFIG_MODE_TT) := -DMODE_TT
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CONFIG_KERNEL_STACK_ORDER ?= 2
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STACK_SIZE := $(shell echo $$[ 4096 * (1 << $(CONFIG_KERNEL_STACK_ORDER)) ] )
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ifndef START
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START = $(shell echo $$[ $(TOP_ADDR) - $(SIZE) ] )
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endif
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CPPFLAGS_vmlinux.lds = -U$(SUBARCH) \
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-DSTART=$(START) -DELF_ARCH=$(ELF_ARCH) \
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-DELF_FORMAT="$(ELF_FORMAT)" $(CPP_MODE-y) \
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-DKERNEL_STACK_SIZE=$(STACK_SIZE) \
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-DUNMAP_PATH=arch/um/sys-$(SUBARCH)/unmap_fin.o
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#The wrappers will select whether using "malloc" or the kernel allocator.
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LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
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CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS)
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define cmd_vmlinux__
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$(CC) $(CFLAGS_vmlinux) -o $@ \
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-Wl,-T,$(vmlinux-lds) $(vmlinux-init) \
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-Wl,--start-group $(vmlinux-main) -Wl,--end-group \
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-lutil \
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$(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) \
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FORCE ,$^) ; rm -f linux
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endef
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#When cleaning we don't include .config, so we don't include
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#TT or skas makefiles and don't clean skas_ptregs.h.
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CLEAN_FILES += linux x.i gmon.out $(ARCH_DIR)/include/uml-config.h \
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$(ARCH_DIR)/include/user_constants.h \
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$(ARCH_DIR)/include/kern_constants.h $(ARCH_DIR)/Kconfig.arch
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MRPROPER_FILES += $(SYMLINK_HEADERS) $(ARCH_SYMLINKS) \
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$(addprefix $(ARCH_DIR)/kernel/,$(KERN_SYMLINKS)) $(ARCH_DIR)/os
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archclean:
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@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
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-o -name '*.gcov' \) -type f -print | xargs rm -f
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$(SYMLINK_HEADERS):
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@echo ' SYMLINK $@'
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ifneq ($(KBUILD_SRC),)
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$(Q)ln -fsn $(srctree)/include/asm-um/$(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $@
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else
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$(Q)cd $(TOPDIR)/$(dir $@) ; \
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ln -sf $(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $(notdir $@)
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endif
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include/asm-um/arch:
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@echo ' SYMLINK $@'
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ifneq ($(KBUILD_SRC),)
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$(Q)mkdir -p include/asm-um
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$(Q)ln -fsn $(srctree)/include/asm-$(SUBARCH) include/asm-um/arch
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else
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$(Q)cd $(TOPDIR)/include/asm-um && ln -sf ../asm-$(SUBARCH) arch
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endif
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$(objtree)/$(ARCH_DIR)/include:
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@echo ' MKDIR $@'
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$(Q)mkdir -p $@
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$(ARCH_DIR)/include/sysdep: $(objtree)/$(ARCH_DIR)/include
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@echo ' SYMLINK $@'
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ifneq ($(KBUILD_SRC),)
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$(Q)ln -fsn $(srctree)/$(ARCH_DIR)/include/sysdep-$(SUBARCH) $(ARCH_DIR)/include/sysdep
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else
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$(Q)cd $(ARCH_DIR)/include && ln -sf sysdep-$(SUBARCH) sysdep
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endif
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$(ARCH_DIR)/os:
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@echo ' SYMLINK $@'
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ifneq ($(KBUILD_SRC),)
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$(Q)ln -fsn $(srctree)/$(ARCH_DIR)/os-$(OS) $(ARCH_DIR)/os
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else
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$(Q)cd $(ARCH_DIR) && ln -sf os-$(OS) os
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endif
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# Generated files
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define filechk_umlconfig
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sed 's/ CONFIG/ UML_CONFIG/'
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endef
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$(ARCH_DIR)/include/uml-config.h : include/linux/autoconf.h
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$(call filechk,umlconfig)
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$(ARCH_DIR)/user-offsets.s: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.c
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$(CC) $(USER_CFLAGS) -S -o $@ $<
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define filechk_gen-asm-offsets
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(set -e; \
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echo "/*"; \
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echo " * DO NOT MODIFY."; \
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echo " *"; \
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echo " * This file was generated by arch/$(ARCH)/Makefile"; \
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echo " *"; \
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echo " */"; \
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echo ""; \
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sed -ne "/^->/{s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; s:->::; p;}"; \
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echo ""; )
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endef
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$(ARCH_DIR)/include/user_constants.h: $(ARCH_DIR)/user-offsets.s
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$(call filechk,gen-asm-offsets)
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CLEAN_FILES += $(ARCH_DIR)/user-offsets.s
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$(ARCH_DIR)/include/kern_constants.h: $(objtree)/$(ARCH_DIR)/include
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@echo ' SYMLINK $@'
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$(Q) ln -sf ../../../include/asm-um/asm-offsets.h $@
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export SUBARCH USER_CFLAGS OS
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