@@ -5,6 +5,10 @@ menu "UML-specific options"
config UML
bool
default y
+
+config UMMODE_KERN
+ bool "UML mode: kernel mode"
+ default y if "$(UMMODE)" = "kernel"
select ARCH_HAS_KCOV
select ARCH_NO_PREEMPT
select HAVE_ARCH_AUDITSYSCALL
@@ -18,7 +22,25 @@ config UML
select GENERIC_CLOCKEVENTS
select HAVE_GCC_PLUGINS
select TTY # Needed for line.c
+ help
+ This mode switches a mode to build a regular kernel executable
+ of UML.
+
+config UMMODE_LIB
+ bool "UML mode: library mode"
+ depends on !UMMODE_KERN
+ select LKL
+ default y if "$(UMMODE)" = "library"
+ help
+ This mode switches a mode to build a library of UML (Linux
+ Kernel Library/LKL). This switch is exclusive to "kernel mode"
+ of UML, which is traditional mode of UML.
+
+ For more detail about LKL, see
+ <file:Documentation/virt/uml/lkl.txt>.
+
+if UMMODE_KERN
config MMU
bool
default y
@@ -196,6 +218,10 @@ config UML_TIME_TRAVEL_SUPPORT
It is safe to say Y, but you probably don't need this.
+endif #UMMODE_KERN
+
endmenu
source "arch/um/drivers/Kconfig"
+
+source "arch/um/lkl/Kconfig"
@@ -1,148 +1,15 @@
-#
-# This file is included by the global makefile so that you can add your own
-# architecture-specific flags and dependencies.
-#
-# Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
-# Licensed under the GPL
-#
-
-# select defconfig based on actual architecture
-ifeq ($(SUBARCH),x86)
- ifeq ($(shell uname -m),x86_64)
- KBUILD_DEFCONFIG := x86_64_defconfig
- else
- KBUILD_DEFCONFIG := i386_defconfig
- endif
-else
- KBUILD_DEFCONFIG := $(SUBARCH)_defconfig
-endif
+# SPDX-License-Identifier: GPL-2.0
ARCH_DIR := arch/um
-OS := $(shell uname -s)
-# We require bash because the vmlinux link and loader script cpp use bash
-# features.
-SHELL := /bin/bash
-
-core-y += $(ARCH_DIR)/kernel/ \
- $(ARCH_DIR)/drivers/ \
- $(ARCH_DIR)/os-$(OS)/
-
-MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
-HEADER_ARCH := $(SUBARCH)
+# select mode of UML build
+UMMODE ?= kernel
+include $(ARCH_DIR)/lkl/auto.conf
-ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
- HEADER_ARCH := x86
+ifeq ($(UMMODE),kernel)
+ include $(ARCH_DIR)/Makefile.um
+else ifeq ($(UMMODE),library)
+ include $(ARCH_DIR)/lkl/Makefile
endif
-ifdef CONFIG_64BIT
- KBUILD_CFLAGS += -mcmodel=large
-endif
-
-HOST_DIR := arch/$(HEADER_ARCH)
-
-include $(ARCH_DIR)/Makefile-skas
-include $(HOST_DIR)/Makefile.um
-
-core-y += $(HOST_DIR)/um/
-
-SHARED_HEADERS := $(ARCH_DIR)/include/shared
-ARCH_INCLUDE := -I$(srctree)/$(SHARED_HEADERS)
-ARCH_INCLUDE += -I$(srctree)/$(HOST_DIR)/um/shared
-KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
-
-# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
-# named - it's a common symbol in libpcap, so we get a binary which crashes.
-#
-# Same things for in6addr_loopback and mktime - found in libc. For these two we
-# only get link-time error, luckily.
-#
-# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
-# embedded copy of longjmp, same thing for setjmp.
-#
-# These apply to USER_CFLAGS to.
-
-KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
- $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
- -Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
- -Din6addr_loopback=kernel_in6addr_loopback \
- -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
-
-KBUILD_AFLAGS += $(ARCH_INCLUDE)
-
-USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
- $(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \
- -D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \
- -idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__
-
-#This will adjust *FLAGS accordingly to the platform.
-include $(ARCH_DIR)/Makefile-os-$(OS)
-
-KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
- -I$(srctree)/$(HOST_DIR)/include/uapi \
- -I$(objtree)/$(HOST_DIR)/include/generated \
- -I$(objtree)/$(HOST_DIR)/include/generated/uapi
-
-# -Derrno=kernel_errno - This turns all kernel references to errno into
-# kernel_errno to separate them from the libc errno. This allows -fno-common
-# in KBUILD_CFLAGS. Otherwise, it would cause ld to complain about the two different
-# errnos.
-# These apply to kernelspace only.
-#
-# strip leading and trailing whitespace to make the USER_CFLAGS removal of these
-# defines more robust
-
-KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
- -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
-KBUILD_CFLAGS += $(KERNEL_DEFINES)
-
-PHONY += linux
-
-all: linux
-
-linux: vmlinux
- @echo ' LINK $@'
- $(Q)ln -f $< $@
-
-define archhelp
- echo '* linux - Binary kernel image (./linux) - for backward'
- echo ' compatibility only, this creates a hard link to the'
- echo ' real kernel binary, the "vmlinux" binary you'
- echo ' find in the kernel root.'
-endef
-
-archheaders:
- $(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders
-
-archprepare:
- $(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h
-
-LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
-LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib $(call cc-option, -no-pie)
-
-CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
- $(call cc-option, -fno-stack-protector,) \
- $(call cc-option, -fno-stack-protector-all,)
-
-# Options used by linker script
-export LDS_START := $(START)
-export LDS_ELF_ARCH := $(ELF_ARCH)
-export LDS_ELF_FORMAT := $(ELF_FORMAT)
-
-# The wrappers will select whether using "malloc" or the kernel allocator.
-LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
-
-LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS),-Wl,$(opt))
-
-# Used by link-vmlinux.sh which has special support for um link
-export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
-
-# When cleaning we don't include .config, so we don't include
-# TT or skas makefiles and don't clean skas_ptregs.h.
-CLEAN_FILES += linux x.i gmon.out
-
-archclean:
- @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
- -o -name '*.gcov' \) -type f -print | xargs rm -f
-
-export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH
+export UMMODE HEADER_ARCH HOST_DIR SRCARCH
new file mode 100644
@@ -0,0 +1,149 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# This file is included by the global makefile so that you can add your own
+# architecture-specific flags and dependencies.
+#
+# Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+# Licensed under the GPL
+#
+
+# select defconfig based on actual architecture
+ifeq ($(SUBARCH),x86)
+ ifeq ($(shell uname -m),x86_64)
+ KBUILD_DEFCONFIG := x86_64_defconfig
+ else
+ KBUILD_DEFCONFIG := i386_defconfig
+ endif
+else
+ KBUILD_DEFCONFIG := $(SUBARCH)_defconfig
+endif
+
+ARCH_DIR := arch/um
+OS := $(shell uname -s)
+# We require bash because the vmlinux link and loader script cpp use bash
+# features.
+SHELL := /bin/bash
+
+core-y += $(ARCH_DIR)/kernel/ \
+ $(ARCH_DIR)/drivers/ \
+ $(ARCH_DIR)/os-$(OS)/
+
+MODE_INCLUDE += -I$(srctree)/$(ARCH_DIR)/include/shared/skas
+
+HEADER_ARCH := $(SUBARCH)
+
+ifneq ($(filter $(SUBARCH),x86 x86_64 i386),)
+ HEADER_ARCH := x86
+endif
+
+ifdef CONFIG_64BIT
+ KBUILD_CFLAGS += -mcmodel=large
+endif
+
+HOST_DIR := arch/$(HEADER_ARCH)
+
+include $(ARCH_DIR)/Makefile-skas
+include $(HOST_DIR)/Makefile.um
+
+core-y += $(HOST_DIR)/um/
+
+SHARED_HEADERS := $(ARCH_DIR)/include/shared
+ARCH_INCLUDE := -I$(srctree)/$(SHARED_HEADERS)
+ARCH_INCLUDE += -I$(srctree)/$(HOST_DIR)/um/shared
+KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/um
+
+# -Dvmap=kernel_vmap prevents anything from referencing the libpcap.o symbol so
+# named - it's a common symbol in libpcap, so we get a binary which crashes.
+#
+# Same things for in6addr_loopback and mktime - found in libc. For these two we
+# only get link-time error, luckily.
+#
+# -Dlongjmp=kernel_longjmp prevents anything from referencing the libpthread.a
+# embedded copy of longjmp, same thing for setjmp.
+#
+# These apply to USER_CFLAGS to.
+
+KBUILD_CFLAGS += $(CFLAGS) $(CFLAGS-y) -D__arch_um__ \
+ $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap \
+ -Dlongjmp=kernel_longjmp -Dsetjmp=kernel_setjmp \
+ -Din6addr_loopback=kernel_in6addr_loopback \
+ -Din6addr_any=kernel_in6addr_any -Dstrrchr=kernel_strrchr
+
+KBUILD_AFLAGS += $(ARCH_INCLUDE)
+
+USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
+ $(ARCH_INCLUDE) $(MODE_INCLUDE) $(filter -I%,$(CFLAGS)) \
+ -D_FILE_OFFSET_BITS=64 -idirafter $(srctree)/include \
+ -idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__
+
+#This will adjust *FLAGS accordingly to the platform.
+include $(ARCH_DIR)/Makefile-os-$(OS)
+
+KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
+ -I$(srctree)/$(HOST_DIR)/include/uapi \
+ -I$(objtree)/$(HOST_DIR)/include/generated \
+ -I$(objtree)/$(HOST_DIR)/include/generated/uapi
+
+# -Derrno=kernel_errno - This turns all kernel references to errno into
+# kernel_errno to separate them from the libc errno. This allows -fno-common
+# in KBUILD_CFLAGS. Otherwise, it would cause ld to complain about the two different
+# errnos.
+# These apply to kernelspace only.
+#
+# strip leading and trailing whitespace to make the USER_CFLAGS removal of these
+# defines more robust
+
+KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
+ -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
+KBUILD_CFLAGS += $(KERNEL_DEFINES)
+
+PHONY += linux
+
+all: linux
+
+linux: vmlinux
+ @echo ' LINK $@'
+ $(Q)ln -f $< $@
+
+define archhelp
+ echo '* linux - Binary kernel image (./linux) - for backward'
+ echo ' compatibility only, this creates a hard link to the'
+ echo ' real kernel binary, the "vmlinux" binary you'
+ echo ' find in the kernel root.'
+endef
+
+archheaders:
+ $(Q)$(MAKE) -f $(srctree)/Makefile ARCH=$(HEADER_ARCH) asm-generic archheaders
+
+archprepare:
+ $(Q)$(MAKE) $(build)=$(HOST_DIR)/um include/generated/user_constants.h
+
+LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
+LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib $(call cc-option, -no-pie)
+
+CFLAGS_NO_HARDENING := $(call cc-option, -fno-PIC,) $(call cc-option, -fno-pic,) \
+ $(call cc-option, -fno-stack-protector,) \
+ $(call cc-option, -fno-stack-protector-all,)
+
+# Options used by linker script
+export LDS_START := $(START)
+export LDS_ELF_ARCH := $(ELF_ARCH)
+export LDS_ELF_FORMAT := $(ELF_FORMAT)
+
+# The wrappers will select whether using "malloc" or the kernel allocator.
+LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
+
+LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS),-Wl,$(opt))
+
+# Used by link-vmlinux.sh which has special support for um link
+export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)
+
+# When cleaning we don't include .config, so we don't include
+# TT or skas makefiles and don't clean skas_ptregs.h.
+CLEAN_FILES += linux x.i gmon.out
+
+archclean:
+ @find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
+ -o -name '*.gcov' \) -type f -print | xargs rm -f
+
+export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH
@@ -1,6 +1,8 @@
# SPDX-License-Identifier: GPL-2.0
-config UML_LKL
+menu "LKL-specific options"
+
+config LKL
def_bool y
depends on !SMP && !MMU && !COREDUMP && !SECCOMP && !UPROBES && !COMPAT && !USER_RETURN_NOTIFIER
select ARCH_THREAD_STACK_ALLOCATOR
@@ -59,7 +61,7 @@ config BIG_ENDIAN
def_bool n
config GENERIC_CSUM
- def_bool y
+ def_bool LKL
config GENERIC_HWEIGHT
def_bool y
@@ -83,13 +85,4 @@ config HZ
int
default 100
-config CONSOLE_LOGLEVEL_QUIET
- int "quiet console loglevel (1-15)"
- range 1 15
- default "4"
- help
- loglevel to use when "quiet" is passed on the kernel commandline.
-
- When "quiet" is passed on the kernel commandline this loglevel
- will be used as the loglevel. IOW passing "quiet" will be the
- equivalent of passing "loglevel=<CONSOLE_LOGLEVEL_QUIET>"
+endmenu
new file mode 100644
@@ -0,0 +1,69 @@
+# SPDX-License-Identifier: GPL-2.0
+
+HOST_DIR := $(ARCH_DIR)/lkl
+include $(HOST_DIR)/auto.conf
+
+SRCARCH := um/lkl
+ARCH_INCLUDE += -I$(srctree)/$(HOST_DIR)/um/include
+LINUXINCLUDE := $(subst $(ARCH_DIR),$(HOST_DIR),$(LINUXINCLUDE)) $(ARCH_INCLUDE)
+KBUILD_CFLAGS += -fno-builtin -D__arch_um__
+KBUILD_DEFCONFIG := lkl_defconfig
+
+ifneq (,$(filter $(OUTPUT_FORMAT),elf64-x86-64 elf32-i386 elf64-x86-64-freebsd elf32-littlearm elf64-littleaarch64))
+KBUILD_CFLAGS += -fPIC
+else ifneq (,$(filter $(OUTPUT_FORMAT),pe-i386 pe-x86-64 ))
+ifneq ($(OUTPUT_FORMAT),pe-x86-64)
+prefix=_
+endif
+# workaround for #include_next<stdarg.h> errors
+LINUXINCLUDE := -isystem $(HOST_DIR)/include/system $(LINUXINCLUDE)
+# workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52991
+KBUILD_CFLAGS += -mno-ms-bitfields
+else
+$(error Unrecognized platform: $(OUTPUT_FORMAT))
+endif
+
+ifeq ($(shell uname -s), Linux)
+NPROC=$(shell nproc)
+else # e.g., FreeBSD
+NPROC=$(shell sysctl -n hw.ncpu)
+endif
+
+LDFLAGS_vmlinux += -r
+LKL_ENTRY_POINTS := lkl_start_kernel lkl_sys_halt lkl_syscall lkl_trigger_irq \
+ lkl_get_free_irq lkl_put_irq lkl_is_running lkl_bug lkl_printf
+
+ifeq ($(OUTPUT_FORMAT),elf32-i386)
+LKL_ENTRY_POINTS += \
+ __x86.get_pc_thunk.bx __x86.get_pc_thunk.dx __x86.get_pc_thunk.ax \
+ __x86.get_pc_thunk.cx __x86.get_pc_thunk.si __x86.get_pc_thunk.di
+endif
+
+core-y += $(HOST_DIR)/kernel/
+core-y += $(HOST_DIR)/mm/
+
+all: lkl.o
+
+lkl.o: vmlinux
+ $(OBJCOPY) -R .eh_frame -R .syscall_defs $(foreach sym,$(LKL_ENTRY_POINTS),-G$(prefix)$(sym)) vmlinux lkl.o
+
+$(HOST_DIR)/include/generated/uapi/asm/syscall_defs.h: vmlinux
+ $(OBJCOPY) -j .syscall_defs -O binary --set-section-flags .syscall_defs=alloc $< $@
+ $(Q) export tmpfile=$(shell mktemp); \
+ sed 's/\x0//g' $@ > $$tmpfile; mv $$tmpfile $@ ; rm -f $$tmpfile
+
+install: lkl.o headers $(HOST_DIR)/include/generated/uapi/asm/syscall_defs.h
+ @echo " INSTALL $(INSTALL_PATH)/lib/lkl.o"
+ @mkdir -p $(INSTALL_PATH)/lib/
+ @cp lkl.o $(INSTALL_PATH)/lib/
+ @$(srctree)/$(HOST_DIR)/scripts/headers_install.py \
+ $(subst -j,-j$(NPROC),$(findstring -j,$(MAKEFLAGS))) \
+ $(INSTALL_PATH)/include
+
+archclean:
+ $(Q)rm -rf $(srctree)/$(HOST_DIR)/include/generated
+ $(Q)$(MAKE) $(clean)=$(boot)
+
+define archhelp
+ echo ' install - Install library and headers to INSTALL_PATH/{lib,include}'
+endef
new file mode 100644
@@ -0,0 +1 @@
+export OUTPUT_FORMAT=$(shell $(LD) -r -print-output-format)
new file mode 100644
@@ -0,0 +1,4 @@
+extra-y := vmlinux.lds
+
+obj-y = setup.o threads.o irq.o time.o syscalls.o misc.o console.o \
+ syscalls_32.o cpu.o
new file mode 100644
@@ -0,0 +1 @@
+obj-y = bootmem.o