Merge branch 'x86/um-header' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86/um-header' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (26 commits)
  x86: canonicalize remaining header guards
  x86: drop double underscores from header guards
  x86: Fix ASM_X86__ header guards
  x86, um: get rid of uml-config.h
  x86, um: get rid of arch/um/Kconfig.arch
  x86, um: get rid of arch/um/os symlink
  x86, um: get rid of excessive includes of uml-config.h
  x86, um: get rid of header symlinks
  x86, um: merge Kconfig.i386 and Kconfig.x86_64
  x86, um: get rid of sysdep symlink
  x86, um: trim the junk from uml ptrace-*.h
  x86, um: take vm-flags.h to sysdep
  x86, um: get rid of uml asm/arch
  x86, um: get rid of uml highmem.h
  x86, um: get rid of uml unistd.h
  x86, um: get rid of system.h -> system.h include
  x86, um: uml atomic.h is not needed anymore
  x86, um: untangle uml ldt.h
  x86, um: get rid of more uml asm/arch uses
  x86, um: remove dead header (uml module-generic.h; never used these days)
  ...

Makefile

@@ -437,7 +437,7 @@ ifeq ($(config-targets),1)
 # KBUILD_DEFCONFIG may point out an alternative default configuration
 # used for 'make defconfig'
 include $(srctree)/arch/$(SRCARCH)/Makefile
-export KBUILD_DEFCONFIG
+export KBUILD_DEFCONFIG KBUILD_KCONFIG
 
 config %config: scripts_basic outputmakefile FORCE
 	$(Q)mkdir -p include/linux include/config

arch/ia64/ia32/audit.c

-#include <asm-x86/unistd_32.h>
+#include "../../x86/include/asm/unistd_32.h"
 
 unsigned ia32_dir_class[] = {
 #include <asm-generic/audit_dir_write.h>

arch/powerpc/include/asm/signal.h

@@ -122,7 +122,6 @@ typedef struct sigaltstack {
 
 #ifdef __KERNEL__
 struct pt_regs;
-extern void do_signal(struct pt_regs *regs, unsigned long thread_info_flags);
 #define ptrace_signal_deliver(regs, cookie) do { } while (0)
 #endif /* __KERNEL__ */
 

arch/powerpc/kernel/signal.h

@@ -12,6 +12,8 @@
 
 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 
+extern void do_signal(struct pt_regs *regs, unsigned long thread_info_flags);
+
 extern void __user * get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
 				  size_t frame_size);
 extern void restore_sigmask(sigset_t *set);

arch/um/Kconfig

-config DEFCONFIG_LIST
-	string
-	option defconfig_list
-	default "arch/$ARCH/defconfig"
-
-# UML uses the generic IRQ subsystem
-config GENERIC_HARDIRQS
-	bool
-	default y
-
-config UML
-	bool
-	default y
-
-config MMU
-	bool
-	default y
-
-config NO_IOMEM
-	def_bool y
-
-mainmenu "Linux/Usermode Kernel Configuration"
-
-config ISA
-	bool
-
-config SBUS
-	bool
-
-config PCI
-	bool
-
-config PCMCIA
-	bool
-
-# Yet to do!
-config TRACE_IRQFLAGS_SUPPORT
-	bool
-	default n
-
-config LOCKDEP_SUPPORT
-	bool
-	default y
-
-config STACKTRACE_SUPPORT
-	bool
-	default n
-
-config GENERIC_CALIBRATE_DELAY
-	bool
-	default y
-
-config GENERIC_BUG
-	bool
-	default y
-	depends on BUG
-
-config GENERIC_TIME
-	bool
-	default y
-
-config GENERIC_CLOCKEVENTS
-	bool
-	default y
-
-# Used in kernel/irq/manage.c and include/linux/irq.h
-config IRQ_RELEASE_METHOD
-	bool
-	default y
-
-config HZ
-	int
-	default 100
-
-menu "UML-specific options"
-
-config STATIC_LINK
-	bool "Force a static link"
-	default n
-	help
-	  This option gives you the ability to force a static link of UML.
-	  Normally, UML is linked as a shared binary.  This is inconvenient for
-	  use in a chroot jail.  So, if you intend to run UML inside a chroot,
-	  you probably want to say Y here.
-	  Additionally, this option enables using higher memory spaces (up to
-	  2.75G) for UML.
-
-source "arch/um/Kconfig.arch"
-source "mm/Kconfig"
-source "kernel/time/Kconfig"
-
-config LD_SCRIPT_STATIC
-	bool
-	default y
-	depends on STATIC_LINK
-
-config LD_SCRIPT_DYN
-	bool
-	default y
-	depends on !LD_SCRIPT_STATIC
-
-source "fs/Kconfig.binfmt"
-
-config HOSTFS
-	tristate "Host filesystem"
-	help
-          While the User-Mode Linux port uses its own root file system for
-          booting and normal file access, this module lets the UML user
-          access files stored on the host.  It does not require any
-          network connection between the Host and UML.  An example use of
-          this might be:
-
-          mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
-
-          where /tmp/fromhost is an empty directory inside UML and
-          /tmp/umlshare is a directory on the host with files the UML user
-          wishes to access.
-
-          For more information, see
-          <http://user-mode-linux.sourceforge.net/hostfs.html>.
-
-          If you'd like to be able to work with files stored on the host,
-          say Y or M here; otherwise say N.
-
-config HPPFS
-	tristate "HoneyPot ProcFS (EXPERIMENTAL)"
-	depends on EXPERIMENTAL
-	help
-	  hppfs (HoneyPot ProcFS) is a filesystem which allows UML /proc
-	  entries to be overridden, removed, or fabricated from the host.
-	  Its purpose is to allow a UML to appear to be a physical machine
-	  by removing or changing anything in /proc which gives away the
-	  identity of a UML.
-
-	  See <http://user-mode-linux.sf.net/old/hppfs.html> for more information.
-
-	  You only need this if you are setting up a UML honeypot.  Otherwise,
-	  it is safe to say 'N' here.
-
-config MCONSOLE
-	bool "Management console"
-	default y
-	help
-          The user mode linux management console is a low-level interface to
-          the kernel, somewhat like the i386 SysRq interface.  Since there is
-          a full-blown operating system running under every user mode linux
-          instance, there is much greater flexibility possible than with the
-          SysRq mechanism.
-
-          If you answer 'Y' to this option, to use this feature, you need the
-          mconsole client (called uml_mconsole) which is present in CVS in
-          2.4.5-9um and later (path /tools/mconsole), and is also in the
-          distribution RPM package in 2.4.6 and later.
-
-          It is safe to say 'Y' here.
-
-config MAGIC_SYSRQ
-	bool "Magic SysRq key"
-	depends on MCONSOLE
-	help
-	  If you say Y here, you will have some control over the system even
-	  if the system crashes for example during kernel debugging (e.g., you
-	  will be able to flush the buffer cache to disk, reboot the system
-	  immediately or dump some status information). A key for each of the
-	  possible requests is provided.
-
-	  This is the feature normally accomplished by pressing a key
-	  while holding SysRq (Alt+PrintScreen).
-
-	  On UML, this is accomplished by sending a "sysrq" command with
-	  mconsole, followed by the letter for the requested command.
-
-	  The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
-	  unless you really know what this hack does.
-
-config SMP
-	bool "Symmetric multi-processing support (EXPERIMENTAL)"
-	default n
-	depends on BROKEN
-	help
-	  This option enables UML SMP support.
-	  It is NOT related to having a real SMP box. Not directly, at least.
-
-	  UML implements virtual SMP by allowing as many processes to run
-	  simultaneously on the host as there are virtual processors configured.
-
-	  Obviously, if the host is a uniprocessor, those processes will
-	  timeshare, but, inside UML, will appear to be running simultaneously.
-	  If the host is a multiprocessor, then UML processes may run
-	  simultaneously, depending on the host scheduler.
-
-	  This, however, is supported only in TT mode. So, if you use the SKAS
-	  patch on your host, switching to TT mode and enabling SMP usually
-	  gives	you worse performances.
-	  Also, since the support for SMP has been under-developed, there could
-	  be some bugs being exposed by enabling SMP.
-
-	  If you don't know what to do, say N.
-
-config NR_CPUS
-	int "Maximum number of CPUs (2-32)"
-	range 2 32
-	depends on SMP
-	default "32"
-
-config HIGHMEM
-	bool "Highmem support (EXPERIMENTAL)"
-	depends on !64BIT && EXPERIMENTAL
-	default n
-	help
-	  This was used to allow UML to run with big amounts of memory.
-	  Currently it is unstable, so if unsure say N.
-
-	  To use big amounts of memory, it is recommended enable static
-	  linking (i.e. CONFIG_STATIC_LINK) - this should allow the
-	  guest to use up to 2.75G of memory.
-
-config KERNEL_STACK_ORDER
-	int "Kernel stack size order"
-	default 1 if 64BIT
-	range 1 10 if 64BIT
-	default 0 if !64BIT
-	help
-	  This option determines the size of UML kernel stacks.  They will
-	  be 1 << order pages.  The default is OK unless you're running Valgrind
-	  on UML, in which case, set this to 3.
-
-endmenu
-
-source "init/Kconfig"
-
-source "kernel/Kconfig.freezer"
-
-source "drivers/block/Kconfig"
-
-source "arch/um/Kconfig.char"
-
-source "drivers/base/Kconfig"
-
-source "net/Kconfig"
-
-source "arch/um/Kconfig.net"
-
-source "drivers/net/Kconfig"
-
-source "drivers/connector/Kconfig"
-
-source "fs/Kconfig"
-
-source "security/Kconfig"
-
-source "crypto/Kconfig"
-
-source "lib/Kconfig"
-
-source "drivers/scsi/Kconfig"
-
-source "drivers/md/Kconfig"
-
-if BROKEN
-	source "drivers/mtd/Kconfig"
-endif
-
-source "drivers/leds/Kconfig"
-
-#This is just to shut up some Kconfig warnings, so no prompt.
-config INPUT
-	bool
-	default n
-
-source "arch/um/Kconfig.debug"

arch/um/Kconfig.common

+config DEFCONFIG_LIST
+	string
+	option defconfig_list
+	default "arch/$ARCH/defconfig"
+
+# UML uses the generic IRQ subsystem
+config GENERIC_HARDIRQS
+	bool
+	default y
+
+config UML
+	bool
+	default y
+
+config MMU
+	bool
+	default y
+
+config NO_IOMEM
+	def_bool y
+
+mainmenu "Linux/Usermode Kernel Configuration"
+
+config ISA
+	bool
+
+config SBUS
+	bool
+
+config PCI
+	bool
+
+config PCMCIA
+	bool
+
+# Yet to do!
+config TRACE_IRQFLAGS_SUPPORT
+	bool
+	default n
+
+config LOCKDEP_SUPPORT
+	bool
+	default y
+
+config STACKTRACE_SUPPORT
+	bool
+	default n
+
+config GENERIC_CALIBRATE_DELAY
+	bool
+	default y
+
+config GENERIC_BUG
+	bool
+	default y
+	depends on BUG
+
+config GENERIC_TIME
+	bool
+	default y
+
+config GENERIC_CLOCKEVENTS
+	bool
+	default y
+
+# Used in kernel/irq/manage.c and include/linux/irq.h
+config IRQ_RELEASE_METHOD
+	bool
+	default y
+
+config HZ
+	int
+	default 100
+
+config SUBARCH
+	string
+	option env="SUBARCH"

arch/um/Kconfig.i386

-menu "Host processor type and features"
-
-source "arch/x86/Kconfig.cpu"
-
-endmenu
-
-config UML_X86
-	bool
-	default y
-
-config X86_32
-	bool
-	default y
-  	select HAVE_AOUT
-
-config RWSEM_XCHGADD_ALGORITHM
-	def_bool y
-
-config 64BIT
-	bool
-	default n
-
-config 3_LEVEL_PGTABLES
-	bool "Three-level pagetables (EXPERIMENTAL)"
-	default n
-	depends on EXPERIMENTAL
-	help
-	Three-level pagetables will let UML have more than 4G of physical
-	memory.  All the memory that can't be mapped directly will be treated
-	as high memory.
-
-	However, this it experimental on 32-bit architectures, so if unsure say
-	N (on x86-64 it's automatically enabled, instead, as it's safe there).
-
-config ARCH_HAS_SC_SIGNALS
-	bool
-	default y
-
-config ARCH_REUSE_HOST_VSYSCALL_AREA
-	bool
-	default y
-
-config GENERIC_HWEIGHT
-	bool
-	default y

arch/um/Kconfig.rest

+source "init/Kconfig"
+
+source "kernel/Kconfig.freezer"
+
+source "drivers/block/Kconfig"
+
+source "arch/um/Kconfig.char"
+
+source "drivers/base/Kconfig"
+
+source "net/Kconfig"
+
+source "arch/um/Kconfig.net"
+
+source "drivers/net/Kconfig"
+
+source "drivers/connector/Kconfig"
+
+source "fs/Kconfig"
+
+source "security/Kconfig"
+
+source "crypto/Kconfig"
+
+source "lib/Kconfig"
+
+source "drivers/scsi/Kconfig"
+
+source "drivers/md/Kconfig"
+
+if BROKEN
+	source "drivers/mtd/Kconfig"
+endif
+
+source "drivers/leds/Kconfig"
+
+#This is just to shut up some Kconfig warnings, so no prompt.
+config INPUT
+	bool
+	default n
+
+source "arch/um/Kconfig.debug"

arch/um/Kconfig.um

+config STATIC_LINK
+	bool "Force a static link"
+	default n
+	help
+	  This option gives you the ability to force a static link of UML.
+	  Normally, UML is linked as a shared binary.  This is inconvenient for
+	  use in a chroot jail.  So, if you intend to run UML inside a chroot,
+	  you probably want to say Y here.
+	  Additionally, this option enables using higher memory spaces (up to
+	  2.75G) for UML.
+
+source "mm/Kconfig"
+source "kernel/time/Kconfig"
+
+config LD_SCRIPT_STATIC
+	bool
+	default y
+	depends on STATIC_LINK
+
+config LD_SCRIPT_DYN
+	bool
+	default y
+	depends on !LD_SCRIPT_STATIC
+
+source "fs/Kconfig.binfmt"
+
+config HOSTFS
+	tristate "Host filesystem"
+	help
+          While the User-Mode Linux port uses its own root file system for
+          booting and normal file access, this module lets the UML user
+          access files stored on the host.  It does not require any
+          network connection between the Host and UML.  An example use of
+          this might be:
+
+          mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
+
+          where /tmp/fromhost is an empty directory inside UML and
+          /tmp/umlshare is a directory on the host with files the UML user
+          wishes to access.
+
+          For more information, see
+          <http://user-mode-linux.sourceforge.net/hostfs.html>.
+
+          If you'd like to be able to work with files stored on the host,
+          say Y or M here; otherwise say N.
+
+config HPPFS
+	tristate "HoneyPot ProcFS (EXPERIMENTAL)"
+	depends on EXPERIMENTAL
+	help
+	  hppfs (HoneyPot ProcFS) is a filesystem which allows UML /proc
+	  entries to be overridden, removed, or fabricated from the host.
+	  Its purpose is to allow a UML to appear to be a physical machine
+	  by removing or changing anything in /proc which gives away the
+	  identity of a UML.
+
+	  See <http://user-mode-linux.sf.net/old/hppfs.html> for more information.
+
+	  You only need this if you are setting up a UML honeypot.  Otherwise,
+	  it is safe to say 'N' here.
+
+config MCONSOLE
+	bool "Management console"
+	default y
+	help
+          The user mode linux management console is a low-level interface to
+          the kernel, somewhat like the i386 SysRq interface.  Since there is
+          a full-blown operating system running under every user mode linux
+          instance, there is much greater flexibility possible than with the
+          SysRq mechanism.
+
+          If you answer 'Y' to this option, to use this feature, you need the
+          mconsole client (called uml_mconsole) which is present in CVS in
+          2.4.5-9um and later (path /tools/mconsole), and is also in the
+          distribution RPM package in 2.4.6 and later.
+
+          It is safe to say 'Y' here.
+
+config MAGIC_SYSRQ
+	bool "Magic SysRq key"
+	depends on MCONSOLE
+	help
+	  If you say Y here, you will have some control over the system even
+	  if the system crashes for example during kernel debugging (e.g., you
+	  will be able to flush the buffer cache to disk, reboot the system
+	  immediately or dump some status information). A key for each of the
+	  possible requests is provided.
+
+	  This is the feature normally accomplished by pressing a key
+	  while holding SysRq (Alt+PrintScreen).
+
+	  On UML, this is accomplished by sending a "sysrq" command with
+	  mconsole, followed by the letter for the requested command.
+
+	  The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
+	  unless you really know what this hack does.
+
+config SMP
+	bool "Symmetric multi-processing support (EXPERIMENTAL)"
+	default n
+	depends on BROKEN
+	help
+	  This option enables UML SMP support.
+	  It is NOT related to having a real SMP box. Not directly, at least.
+
+	  UML implements virtual SMP by allowing as many processes to run
+	  simultaneously on the host as there are virtual processors configured.
+
+	  Obviously, if the host is a uniprocessor, those processes will
+	  timeshare, but, inside UML, will appear to be running simultaneously.
+	  If the host is a multiprocessor, then UML processes may run
+	  simultaneously, depending on the host scheduler.
+
+	  This, however, is supported only in TT mode. So, if you use the SKAS
+	  patch on your host, switching to TT mode and enabling SMP usually
+	  gives	you worse performances.
+	  Also, since the support for SMP has been under-developed, there could
+	  be some bugs being exposed by enabling SMP.
+
+	  If you don't know what to do, say N.
+
+config NR_CPUS
+	int "Maximum number of CPUs (2-32)"
+	range 2 32
+	depends on SMP
+	default "32"
+
+config HIGHMEM
+	bool "Highmem support (EXPERIMENTAL)"
+	depends on !64BIT && EXPERIMENTAL
+	default n
+	help
+	  This was used to allow UML to run with big amounts of memory.
+	  Currently it is unstable, so if unsure say N.
+
+	  To use big amounts of memory, it is recommended enable static
+	  linking (i.e. CONFIG_STATIC_LINK) - this should allow the
+	  guest to use up to 2.75G of memory.
+
+config KERNEL_STACK_ORDER
+	int "Kernel stack size order"
+	default 1 if 64BIT
+	range 1 10 if 64BIT
+	default 0 if !64BIT
+	help
+	  This option determines the size of UML kernel stacks.  They will
+	  be 1 << order pages.  The default is OK unless you're running Valgrind
+	  on UML, in which case, set this to 3.

arch/um/Kconfig.x86

+source "arch/um/Kconfig.common"
+
+menu "UML-specific options"
+
+menu "Host processor type and features"
+
+source "arch/x86/Kconfig.cpu"
+
+endmenu
+
+config UML_X86
+	def_bool y
+
+config 64BIT
+	bool
+	default SUBARCH = "x86_64"
+
+config X86_32
+	def_bool !64BIT
+	select HAVE_AOUT
+
+config RWSEM_XCHGADD_ALGORITHM
+	def_bool X86_XADD
+
+config RWSEM_GENERIC_SPINLOCK
+	def_bool !X86_XADD
+
+config 3_LEVEL_PGTABLES
+	bool "Three-level pagetables (EXPERIMENTAL)" if !64BIT
+	default 64BIT
+	depends on EXPERIMENTAL
+	help
+	Three-level pagetables will let UML have more than 4G of physical
+	memory.  All the memory that can't be mapped directly will be treated
+	as high memory.
+
+	However, this it experimental on 32-bit architectures, so if unsure say
+	N (on x86-64 it's automatically enabled, instead, as it's safe there).
+
+config ARCH_HAS_SC_SIGNALS
+	def_bool !64BIT
+
+config ARCH_REUSE_HOST_VSYSCALL_AREA
+	def_bool !64BIT
+
+config SMP_BROKEN
+	def_bool 64BIT
+
+config GENERIC_HWEIGHT
+	def_bool y
+
+source "arch/um/Kconfig.um"
+
+endmenu
+
+source "arch/um/Kconfig.rest"

arch/um/Kconfig.x86_64

-
-menu "Host processor type and features"
-
-source "arch/x86/Kconfig.cpu"
-
-endmenu
-
-config UML_X86
-	bool
-	default y
-
-config 64BIT
-	bool
-	default y
-
-#XXX: this is so in the underlying arch, but it's wrong!!!
-config RWSEM_GENERIC_SPINLOCK
-	bool
-	default y
-
-config 3_LEVEL_PGTABLES
-       bool
-       default y
-
-config ARCH_HAS_SC_SIGNALS
-	bool
-	default n
-
-config ARCH_REUSE_HOST_VSYSCALL_AREA
-	bool
-	default n
-
-config SMP_BROKEN
-	bool
-	default y
-
-config GENERIC_HWEIGHT
-	bool
-	default y

arch/um/Makefile

@@ -18,28 +18,16 @@ core-y			+= $(ARCH_DIR)/kernel/		\
 			   $(ARCH_DIR)/drivers/		\
 			   $(ARCH_DIR)/os-$(OS)/
 
-# Have to precede the include because the included Makefiles reference them.
-SYMLINK_HEADERS := archparam.h system.h sigcontext.h processor.h ptrace.h \
-	module.h vm-flags.h elf.h host_ldt.h
-SYMLINK_HEADERS := $(foreach header,$(SYMLINK_HEADERS),include/asm-um/$(header))
-
-# XXX: The "os" symlink is only used by arch/um/include/os.h, which includes
-# ../os/include/file.h
-#
-# These are cleaned up during mrproper. Please DO NOT fix it again, this is
-# the Correct Thing(tm) to do!
-ARCH_SYMLINKS = include/asm-um/arch $(ARCH_DIR)/include/sysdep $(ARCH_DIR)/os \
-	$(SYMLINK_HEADERS) $(ARCH_DIR)/include/uml-config.h
-
-MODE_INCLUDE	+= -I$(srctree)/$(ARCH_DIR)/include/skas
+MODE_INCLUDE	+= -I$(srctree)/$(ARCH_DIR)/include/shared/skas
 
 include $(srctree)/$(ARCH_DIR)/Makefile-skas
 
-ARCH_INCLUDE	:= -I$(ARCH_DIR)/include
+ARCH_INCLUDE	:= -I$(srctree)/$(ARCH_DIR)/include/shared
+ARCH_INCLUDE	+= -I$(srctree)/$(ARCH_DIR)/sys-$(SUBARCH)/shared
 ifneq ($(KBUILD_SRC),)
-ARCH_INCLUDE	+= -I$(srctree)/$(ARCH_DIR)/include
+ARCH_INCLUDE	+= -I$(ARCH_DIR)/include/shared # for two generated files
 endif
-SYS_DIR		:= $(ARCH_DIR)/include/sysdep-$(SUBARCH)
+KBUILD_CPPFLAGS += -I$(srctree)/$(ARCH_DIR)/sys-$(SUBARCH)
 
 # -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.
@@ -65,6 +53,8 @@ include $(srctree)/$(ARCH_DIR)/Makefile-$(SUBARCH)
 #This will adjust *FLAGS accordingly to the platform.
 include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
 
+KBUILD_CPPFLAGS += -I$(srctree)/arch/$(HEADER_ARCH)/include
+
 # -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
@@ -93,14 +83,10 @@ define archhelp
   echo '		   find in the kernel root.'
 endef
 
-ifneq ($(KBUILD_SRC),)
-$(shell mkdir -p $(ARCH_DIR) && ln -fsn $(srctree)/$(ARCH_DIR)/Kconfig.$(SUBARCH) $(ARCH_DIR)/Kconfig.arch)
-else
-$(shell cd $(ARCH_DIR) && ln -sf Kconfig.$(SUBARCH) Kconfig.arch)
-endif
+KBUILD_KCONFIG := arch/um/Kconfig.$(HEADER_ARCH)
 
-archprepare: $(ARCH_SYMLINKS) $(ARCH_DIR)/include/user_constants.h
-prepare: $(ARCH_DIR)/include/kern_constants.h
+archprepare: $(ARCH_DIR)/include/shared/user_constants.h
+prepare: $(ARCH_DIR)/include/shared/kern_constants.h
 
 LINK-$(CONFIG_LD_SCRIPT_STATIC) += -static
 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib
@@ -132,62 +118,19 @@ endef
 
 # 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 $(ARCH_DIR)/include/uml-config.h \
-	$(ARCH_DIR)/include/user_constants.h \
-	$(ARCH_DIR)/include/kern_constants.h $(ARCH_DIR)/Kconfig.arch
-
-MRPROPER_FILES += $(ARCH_SYMLINKS)
+CLEAN_FILES += linux x.i gmon.out \
+	$(ARCH_DIR)/include/shared/user_constants.h \
+	$(ARCH_DIR)/include/shared/kern_constants.h
 
 archclean:
 	@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
 		-o -name '*.gcov' \) -type f -print | xargs rm -f
 
-$(SYMLINK_HEADERS):
-	@echo '  SYMLINK $@'
-ifneq ($(KBUILD_SRC),)
-	$(Q)mkdir -p $(objtree)/include/asm-um
-	$(Q)ln -fsn $(srctree)/include/asm-um/$(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $@
-else
-	$(Q)cd $(srctree)/$(dir $@) ; \
-	ln -sf $(basename $(notdir $@))-$(SUBARCH)$(suffix $@) $(notdir $@)
-endif
-
-include/asm-um/arch:
-	@echo '  SYMLINK $@'
-ifneq ($(KBUILD_SRC),)
-	$(Q)mkdir -p $(objtree)/include/asm-um
-	$(Q)ln -fsn $(srctree)/include/asm-$(HEADER_ARCH) include/asm-um/arch
-else
-	$(Q)cd $(srctree)/include/asm-um && ln -fsn ../asm-$(HEADER_ARCH) arch
-endif
-
-$(objtree)/$(ARCH_DIR)/include:
+$(objtree)/$(ARCH_DIR)/include/shared:
 	@echo '  MKDIR $@'
 	$(Q)mkdir -p $@
 
-$(ARCH_DIR)/include/sysdep: $(objtree)/$(ARCH_DIR)/include
-	@echo '  SYMLINK $@'
-ifneq ($(KBUILD_SRC),)
-	$(Q)ln -fsn $(srctree)/$(ARCH_DIR)/include/sysdep-$(SUBARCH) $(ARCH_DIR)/include/sysdep
-else
-	$(Q)cd $(ARCH_DIR)/include && ln -fsn sysdep-$(SUBARCH) sysdep
-endif
-
-$(ARCH_DIR)/os:
-	@echo '  SYMLINK $@'
-ifneq ($(KBUILD_SRC),)
-	$(Q)ln -fsn $(srctree)/$(ARCH_DIR)/os-$(OS) $(ARCH_DIR)/os
-else
-	$(Q)cd $(ARCH_DIR) && ln -fsn os-$(OS) os
-endif
-
 # Generated files
-define filechk_umlconfig
-	sed 's/ CONFIG/ UML_CONFIG/'
-endef
-
-$(ARCH_DIR)/include/uml-config.h : include/linux/autoconf.h
-	$(call filechk,umlconfig)
 
 $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s: FORCE
 	$(Q)$(MAKE) $(build)=$(ARCH_DIR)/sys-$(SUBARCH) $@
@@ -205,11 +148,11 @@ define filechk_gen-asm-offsets
          echo ""; )
 endef
 
-$(ARCH_DIR)/include/user_constants.h: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s
+$(ARCH_DIR)/include/shared/user_constants.h: $(ARCH_DIR)/sys-$(SUBARCH)/user-offsets.s
 	$(call filechk,gen-asm-offsets)
 
-$(ARCH_DIR)/include/kern_constants.h: $(objtree)/$(ARCH_DIR)/include
+$(ARCH_DIR)/include/shared/kern_constants.h: $(objtree)/$(ARCH_DIR)/include/shared
 	@echo '  SYMLINK $@'
-	$(Q)ln -sf ../../../include/asm-um/asm-offsets.h $@
+	$(Q)ln -sf ../../../../include/asm/asm-offsets.h $@
 
-export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS HEADER_ARCH
+export SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS HEADER_ARCH DEV_NULL_PATH

arch/um/Makefile-os-Linux

@@ -6,3 +6,4 @@
 # To get a definition of F_SETSIG
 USER_CFLAGS += -D_GNU_SOURCE -D_LARGEFILE64_SOURCE
 KBUILD_CFLAGS += -D_LARGEFILE64_SOURCE
+DEV_NULL_PATH = \"/dev/null\"

arch/um/drivers/Makefile

@@ -62,5 +62,6 @@ obj-$(CONFIG_UML_RANDOM) += random.o
 
 # pcap_user.o must be added explicitly.
 USER_OBJS := fd.o null.o pty.o tty.o xterm.o slip_common.o pcap_user.o vde_user.o
+CFLAGS_null.o = -DDEV_NULL=$(DEV_NULL_PATH)
 
 include arch/um/scripts/Makefile.rules

arch/um/include/as-layout.h

-/*
- * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
- */
-
-#ifndef __START_H__
-#define __START_H__
-
-#include "uml-config.h"
-#include "kern_constants.h"
-
-/*
- * Stolen from linux/const.h, which can't be directly included since
- * this is used in userspace code, which has no access to the kernel
- * headers.  Changed to be suitable for adding casts to the start,
- * rather than "UL" to the end.
- */
-
-/* Some constant macros are used in both assembler and
- * C code.  Therefore we cannot annotate them always with
- * 'UL' and other type specifiers unilaterally.  We
- * use the following macros to deal with this.
- */
-
-#ifdef __ASSEMBLY__
-#define _UML_AC(X, Y)	(Y)
-#else
-#define __UML_AC(X, Y)	(X(Y))
-#define _UML_AC(X, Y)	__UML_AC(X, Y)
-#endif
-
-#define STUB_START _UML_AC(, 0x100000)
-#define STUB_CODE _UML_AC((unsigned long), STUB_START)
-#define STUB_DATA _UML_AC((unsigned long), STUB_CODE + UM_KERN_PAGE_SIZE)
-#define STUB_END _UML_AC((unsigned long), STUB_DATA + UM_KERN_PAGE_SIZE)
-
-#ifndef __ASSEMBLY__
-
-#include "sysdep/ptrace.h"
-
-struct cpu_task {
-	int pid;
-	void *task;
-};
-
-extern struct cpu_task cpu_tasks[];
-
-extern unsigned long low_physmem;
-extern unsigned long high_physmem;
-extern unsigned long uml_physmem;
-extern unsigned long uml_reserved;
-extern unsigned long end_vm;
-extern unsigned long start_vm;
-extern unsigned long long highmem;
-
-extern unsigned long _stext, _etext, _sdata, _edata, __bss_start, _end;
-extern unsigned long _unprotected_end;
-extern unsigned long brk_start;
-
-extern unsigned long host_task_size;
-
-extern int linux_main(int argc, char **argv);
-
-extern void (*sig_info[])(int, struct uml_pt_regs *);
-
-#endif
-
-#endif

arch/um/include/asm/fixmap.h

+#ifndef __UM_FIXMAP_H
+#define __UM_FIXMAP_H
+
+#include <asm/processor.h>
+#include <asm/system.h>
+#include <asm/kmap_types.h>
+#include <asm/archparam.h>
+#include <asm/page.h>
+#include <linux/threads.h>
+
+/*
+ * Here we define all the compile-time 'special' virtual
+ * addresses. The point is to have a constant address at
+ * compile time, but to set the physical address only
+ * in the boot process. We allocate these special  addresses
+ * from the end of virtual memory (0xfffff000) backwards.
+ * Also this lets us do fail-safe vmalloc(), we
+ * can guarantee that these special addresses and
+ * vmalloc()-ed addresses never overlap.
+ *
+ * these 'compile-time allocated' memory buffers are
+ * fixed-size 4k pages. (or larger if used with an increment
+ * highger than 1) use fixmap_set(idx,phys) to associate
+ * physical memory with fixmap indices.
+ *
+ * TLB entries of such buffers will not be flushed across
+ * task switches.
+ */
+
+/*
+ * on UP currently we will have no trace of the fixmap mechanizm,
+ * no page table allocations, etc. This might change in the
+ * future, say framebuffers for the console driver(s) could be
+ * fix-mapped?
+ */
+enum fixed_addresses {
+#ifdef CONFIG_HIGHMEM
+	FIX_KMAP_BEGIN,	/* reserved pte's for temporary kernel mappings */
+	FIX_KMAP_END = FIX_KMAP_BEGIN+(KM_TYPE_NR*NR_CPUS)-1,
+#endif
+	__end_of_fixed_addresses
+};
+
+extern void __set_fixmap (enum fixed_addresses idx,
+			  unsigned long phys, pgprot_t flags);
+
+#define set_fixmap(idx, phys) \
+		__set_fixmap(idx, phys, PAGE_KERNEL)
+/*
+ * Some hardware wants to get fixmapped without caching.
+ */
+#define set_fixmap_nocache(idx, phys) \
+		__set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)
+/*
+ * used by vmalloc.c.
+ *
+ * Leave one empty page between vmalloc'ed areas and
+ * the start of the fixmap, and leave one page empty
+ * at the top of mem..
+ */
+
+#define FIXADDR_TOP	(TASK_SIZE - 2 * PAGE_SIZE)
+#define FIXADDR_SIZE	(__end_of_fixed_addresses << PAGE_SHIFT)
+#define FIXADDR_START	(FIXADDR_TOP - FIXADDR_SIZE)
+
+#define __fix_to_virt(x)	(FIXADDR_TOP - ((x) << PAGE_SHIFT))
+#define __virt_to_fix(x)      ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
+
+extern void __this_fixmap_does_not_exist(void);
+
+/*
+ * 'index to address' translation. If anyone tries to use the idx
+ * directly without tranlation, we catch the bug with a NULL-deference
+ * kernel oops. Illegal ranges of incoming indices are caught too.
+ */
+static inline unsigned long fix_to_virt(const unsigned int idx)
+{
+	/*
+	 * this branch gets completely eliminated after inlining,
+	 * except when someone tries to use fixaddr indices in an
+	 * illegal way. (such as mixing up address types or using
+	 * out-of-range indices).
+	 *
+	 * If it doesn't get removed, the linker will complain
+	 * loudly with a reasonably clear error message..
+	 */
+	if (idx >= __end_of_fixed_addresses)
+		__this_fixmap_does_not_exist();
+
+        return __fix_to_virt(idx);
+}
+
+static inline unsigned long virt_to_fix(const unsigned long vaddr)
+{
+      BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
+      return __virt_to_fix(vaddr);
+}
+
+#endif

arch/um/include/asm/page.h

+/*
+ * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Copyright 2003 PathScale, Inc.
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PAGE_H
+#define __UM_PAGE_H
+
+#include <linux/const.h>
+
+/* PAGE_SHIFT determines the page size */
+#define PAGE_SHIFT	12
+#define PAGE_SIZE	(_AC(1, UL) << PAGE_SHIFT)
+#define PAGE_MASK	(~(PAGE_SIZE-1))
+
+#ifndef __ASSEMBLY__
+
+struct page;
+
+#include <linux/types.h>
+#include <sysdep/vm-flags.h>
+
+/*
+ * These are used to make use of C type-checking..
+ */
+
+#define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
+#define copy_page(to,from)	memcpy((void *)(to), (void *)(from), PAGE_SIZE)
+
+#define clear_user_page(page, vaddr, pg)	clear_page(page)
+#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
+
+#if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64BIT)
+
+typedef struct { unsigned long pte_low, pte_high; } pte_t;
+typedef struct { unsigned long pmd; } pmd_t;
+typedef struct { unsigned long pgd; } pgd_t;
+#define pte_val(x) ((x).pte_low | ((unsigned long long) (x).pte_high << 32))
+
+#define pte_get_bits(pte, bits) ((pte).pte_low & (bits))
+#define pte_set_bits(pte, bits) ((pte).pte_low |= (bits))
+#define pte_clear_bits(pte, bits) ((pte).pte_low &= ~(bits))
+#define pte_copy(to, from) ({ (to).pte_high = (from).pte_high; \
+			      smp_wmb(); \
+			      (to).pte_low = (from).pte_low; })
+#define pte_is_zero(pte) (!((pte).pte_low & ~_PAGE_NEWPAGE) && !(pte).pte_high)
+#define pte_set_val(pte, phys, prot) \
+	({ (pte).pte_high = (phys) >> 32; \
+	   (pte).pte_low = (phys) | pgprot_val(prot); })
+
+#define pmd_val(x)	((x).pmd)
+#define __pmd(x) ((pmd_t) { (x) } )
+
+typedef unsigned long long pfn_t;
+typedef unsigned long long phys_t;
+
+#else
+
+typedef struct { unsigned long pte; } pte_t;
+typedef struct { unsigned long pgd; } pgd_t;
+
+#ifdef CONFIG_3_LEVEL_PGTABLES
+typedef struct { unsigned long pmd; } pmd_t;
+#define pmd_val(x)	((x).pmd)
+#define __pmd(x) ((pmd_t) { (x) } )
+#endif
+
+#define pte_val(x)	((x).pte)
+
+
+#define pte_get_bits(p, bits) ((p).pte & (bits))
+#define pte_set_bits(p, bits) ((p).pte |= (bits))
+#define pte_clear_bits(p, bits) ((p).pte &= ~(bits))
+#define pte_copy(to, from) ((to).pte = (from).pte)
+#define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE))
+#define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot))
+
+typedef unsigned long pfn_t;
+typedef unsigned long phys_t;
+
+#endif
+
+typedef struct { unsigned long pgprot; } pgprot_t;
+
+typedef struct page *pgtable_t;
+
+#define pgd_val(x)	((x).pgd)
+#define pgprot_val(x)	((x).pgprot)
+
+#define __pte(x) ((pte_t) { (x) } )
+#define __pgd(x) ((pgd_t) { (x) } )
+#define __pgprot(x)	((pgprot_t) { (x) } )
+
+extern unsigned long uml_physmem;
+
+#define PAGE_OFFSET (uml_physmem)
+#define KERNELBASE PAGE_OFFSET
+
+#define __va_space (8*1024*1024)
+
+#include "mem.h"
+
+/* Cast to unsigned long before casting to void * to avoid a warning from
+ * mmap_kmem about cutting a long long down to a void *.  Not sure that
+ * casting is the right thing, but 32-bit UML can't have 64-bit virtual
+ * addresses
+ */
+#define __pa(virt) to_phys((void *) (unsigned long) (virt))
+#define __va(phys) to_virt((unsigned long) (phys))
+
+#define phys_to_pfn(p) ((pfn_t) ((p) >> PAGE_SHIFT))
+#define pfn_to_phys(pfn) ((phys_t) ((pfn) << PAGE_SHIFT))
+
+#define pfn_valid(pfn) ((pfn) < max_mapnr)
+#define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v)))
+
+#include <asm-generic/memory_model.h>
+#include <asm-generic/page.h>
+
+#endif	/* __ASSEMBLY__ */
+#endif	/* __UM_PAGE_H */

arch/um/include/asm/pgtable.h

+/* 
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright 2003 PathScale, Inc.
+ * Derived from include/asm-i386/pgtable.h
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PGTABLE_H
+#define __UM_PGTABLE_H
+
+#include <asm/fixmap.h>
+
+#define _PAGE_PRESENT	0x001
+#define _PAGE_NEWPAGE	0x002
+#define _PAGE_NEWPROT	0x004
+#define _PAGE_RW	0x020
+#define _PAGE_USER	0x040
+#define _PAGE_ACCESSED	0x080
+#define _PAGE_DIRTY	0x100
+/* If _PAGE_PRESENT is clear, we use these: */
+#define _PAGE_FILE	0x008	/* nonlinear file mapping, saved PTE; unset:swap */
+#define _PAGE_PROTNONE	0x010	/* if the user mapped it with PROT_NONE;
+				   pte_present gives true */
+
+#ifdef CONFIG_3_LEVEL_PGTABLES
+#include "asm/pgtable-3level.h"
+#else
+#include "asm/pgtable-2level.h"
+#endif
+
+extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
+
+/* zero page used for uninitialized stuff */
+extern unsigned long *empty_zero_page;
+
+#define pgtable_cache_init() do ; while (0)
+
+/* Just any arbitrary offset to the start of the vmalloc VM area: the
+ * current 8MB value just means that there will be a 8MB "hole" after the
+ * physical memory until the kernel virtual memory starts.  That means that
+ * any out-of-bounds memory accesses will hopefully be caught.
+ * The vmalloc() routines leaves a hole of 4kB between each vmalloced
+ * area for the same reason. ;)
+ */
+
+extern unsigned long end_iomem;
+
+#define VMALLOC_OFFSET	(__va_space)
+#define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1))
+#define PKMAP_BASE ((FIXADDR_START - LAST_PKMAP * PAGE_SIZE) & PMD_MASK)
+#ifdef CONFIG_HIGHMEM
+# define VMALLOC_END	(PKMAP_BASE-2*PAGE_SIZE)
+#else
+# define VMALLOC_END	(FIXADDR_START-2*PAGE_SIZE)
+#endif
+
+#define _PAGE_TABLE	(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
+#define _KERNPG_TABLE	(_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
+#define _PAGE_CHG_MASK	(PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
+
+#define PAGE_NONE	__pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
+#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
+#define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
+#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
+#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
+
+/*
+ * The i386 can't do page protection for execute, and considers that the same
+ * are read.
+ * Also, write permissions imply read permissions. This is the closest we can
+ * get..
+ */
+#define __P000	PAGE_NONE
+#define __P001	PAGE_READONLY
+#define __P010	PAGE_COPY
+#define __P011	PAGE_COPY
+#define __P100	PAGE_READONLY
+#define __P101	PAGE_READONLY
+#define __P110	PAGE_COPY
+#define __P111	PAGE_COPY
+
+#define __S000	PAGE_NONE
+#define __S001	PAGE_READONLY
+#define __S010	PAGE_SHARED
+#define __S011	PAGE_SHARED
+#define __S100	PAGE_READONLY
+#define __S101	PAGE_READONLY
+#define __S110	PAGE_SHARED
+#define __S111	PAGE_SHARED
+
+/*
+ * ZERO_PAGE is a global shared page that is always zero: used
+ * for zero-mapped memory areas etc..
+ */
+#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
+
+#define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE))
+
+#define pmd_none(x)	(!((unsigned long)pmd_val(x) & ~_PAGE_NEWPAGE))
+#define	pmd_bad(x)	((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
+
+#define pmd_present(x)	(pmd_val(x) & _PAGE_PRESENT)
+#define pmd_clear(xp)	do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0)
+
+#define pmd_newpage(x)  (pmd_val(x) & _PAGE_NEWPAGE)
+#define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE)
+
+#define pud_newpage(x)  (pud_val(x) & _PAGE_NEWPAGE)
+#define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE)
+
+#define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK)
+
+#define pte_page(x) pfn_to_page(pte_pfn(x))
+
+#define pte_present(x)	pte_get_bits(x, (_PAGE_PRESENT | _PAGE_PROTNONE))
+
+/*
+ * =================================
+ * Flags checking section.
+ * =================================
+ */
+
+static inline int pte_none(pte_t pte)
+{
+	return pte_is_zero(pte);
+}
+
+/*
+ * The following only work if pte_present() is true.
+ * Undefined behaviour if not..
+ */
+static inline int pte_read(pte_t pte)
+{ 
+	return((pte_get_bits(pte, _PAGE_USER)) &&
+	       !(pte_get_bits(pte, _PAGE_PROTNONE)));
+}
+
+static inline int pte_exec(pte_t pte){
+	return((pte_get_bits(pte, _PAGE_USER)) &&
+	       !(pte_get_bits(pte, _PAGE_PROTNONE)));
+}
+
+static inline int pte_write(pte_t pte)
+{
+	return((pte_get_bits(pte, _PAGE_RW)) &&
+	       !(pte_get_bits(pte, _PAGE_PROTNONE)));
+}
+
+/*
+ * The following only works if pte_present() is not true.
+ */
+static inline int pte_file(pte_t pte)
+{
+	return pte_get_bits(pte, _PAGE_FILE);
+}
+
+static inline int pte_dirty(pte_t pte)
+{
+	return pte_get_bits(pte, _PAGE_DIRTY);
+}
+
+static inline int pte_young(pte_t pte)
+{
+	return pte_get_bits(pte, _PAGE_ACCESSED);
+}
+
+static inline int pte_newpage(pte_t pte)
+{
+	return pte_get_bits(pte, _PAGE_NEWPAGE);
+}
+
+static inline int pte_newprot(pte_t pte)
+{ 
+	return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT)));
+}
+
+static inline int pte_special(pte_t pte)
+{
+	return 0;
+}
+
+/*
+ * =================================
+ * Flags setting section.
+ * =================================
+ */
+
+static inline pte_t pte_mknewprot(pte_t pte)
+{
+	pte_set_bits(pte, _PAGE_NEWPROT);
+	return(pte);
+}
+
+static inline pte_t pte_mkclean(pte_t pte)
+{
+	pte_clear_bits(pte, _PAGE_DIRTY);
+	return(pte);
+}
+
+static inline pte_t pte_mkold(pte_t pte)	
+{ 
+	pte_clear_bits(pte, _PAGE_ACCESSED);
+	return(pte);
+}
+
+static inline pte_t pte_wrprotect(pte_t pte)
+{ 
+	pte_clear_bits(pte, _PAGE_RW);
+	return(pte_mknewprot(pte)); 
+}
+
+static inline pte_t pte_mkread(pte_t pte)
+{ 
+	pte_set_bits(pte, _PAGE_USER);
+	return(pte_mknewprot(pte)); 
+}
+
+static inline pte_t pte_mkdirty(pte_t pte)
+{ 
+	pte_set_bits(pte, _PAGE_DIRTY);
+	return(pte);
+}
+
+static inline pte_t pte_mkyoung(pte_t pte)
+{
+	pte_set_bits(pte, _PAGE_ACCESSED);
+	return(pte);
+}
+
+static inline pte_t pte_mkwrite(pte_t pte)	
+{
+	pte_set_bits(pte, _PAGE_RW);
+	return(pte_mknewprot(pte)); 
+}
+
+static inline pte_t pte_mkuptodate(pte_t pte)	
+{
+	pte_clear_bits(pte, _PAGE_NEWPAGE);
+	if(pte_present(pte))
+		pte_clear_bits(pte, _PAGE_NEWPROT);
+	return(pte); 
+}
+
+static inline pte_t pte_mknewpage(pte_t pte)
+{
+	pte_set_bits(pte, _PAGE_NEWPAGE);
+	return(pte);
+}
+
+static inline pte_t pte_mkspecial(pte_t pte)
+{
+	return(pte);
+}
+
+static inline void set_pte(pte_t *pteptr, pte_t pteval)
+{
+	pte_copy(*pteptr, pteval);
+
+	/* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so
+	 * fix_range knows to unmap it.  _PAGE_NEWPROT is specific to
+	 * mapped pages.
+	 */
+
+	*pteptr = pte_mknewpage(*pteptr);
+	if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr);
+}
+#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+
+/*
+ * Conversion functions: convert a page and protection to a page entry,
+ * and a page entry and page directory to the page they refer to.
+ */
+
+#define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys))
+#define __virt_to_page(virt) phys_to_page(__pa(virt))
+#define page_to_phys(page) pfn_to_phys((pfn_t) page_to_pfn(page))
+#define virt_to_page(addr) __virt_to_page((const unsigned long) addr)
+
+#define mk_pte(page, pgprot) \
+	({ pte_t pte;					\
+							\
+	pte_set_val(pte, page_to_phys(page), (pgprot));	\
+	if (pte_present(pte))				\
+		pte_mknewprot(pte_mknewpage(pte));	\
+	pte;})
+
+static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{
+	pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot);
+	return pte; 
+}
+
+/*
+ * the pgd page can be thought of an array like this: pgd_t[PTRS_PER_PGD]
+ *
+ * this macro returns the index of the entry in the pgd page which would
+ * control the given virtual address
+ */
+#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
+
+/*
+ * pgd_offset() returns a (pgd_t *)
+ * pgd_index() is used get the offset into the pgd page's array of pgd_t's;
+ */
+#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
+
+/*
+ * a shortcut which implies the use of the kernel's pgd, instead
+ * of a process's
+ */
+#define pgd_offset_k(address) pgd_offset(&init_mm, address)
+
+/*
+ * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD]
+ *
+ * this macro returns the index of the entry in the pmd page which would
+ * control the given virtual address
+ */
+#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
+#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
+
+#define pmd_page_vaddr(pmd) \
+	((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
+
+/*
+ * the pte page can be thought of an array like this: pte_t[PTRS_PER_PTE]
+ *
+ * this macro returns the index of the entry in the pte page which would
+ * control the given virtual address
+ */
+#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
+#define pte_offset_kernel(dir, address) \
+	((pte_t *) pmd_page_vaddr(*(dir)) +  pte_index(address))
+#define pte_offset_map(dir, address) \
+	((pte_t *)page_address(pmd_page(*(dir))) + pte_index(address))
+#define pte_offset_map_nested(dir, address) pte_offset_map(dir, address)
+#define pte_unmap(pte) do { } while (0)
+#define pte_unmap_nested(pte) do { } while (0)
+
+struct mm_struct;
+extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
+
+#define update_mmu_cache(vma,address,pte) do ; while (0)
+
+/* Encode and de-code a swap entry */
+#define __swp_type(x)			(((x).val >> 4) & 0x3f)
+#define __swp_offset(x)			((x).val >> 11)
+
+#define __swp_entry(type, offset) \
+	((swp_entry_t) { ((type) << 4) | ((offset) << 11) })
+#define __pte_to_swp_entry(pte) \
+	((swp_entry_t) { pte_val(pte_mkuptodate(pte)) })
+#define __swp_entry_to_pte(x)		((pte_t) { (x).val })
+
+#define kern_addr_valid(addr) (1)
+
+#include <asm-generic/pgtable.h>
+
+/* Clear a kernel PTE and flush it from the TLB */
+#define kpte_clear_flush(ptep, vaddr)		\
+do {						\
+	pte_clear(&init_mm, (vaddr), (ptep));	\
+	__flush_tlb_one((vaddr));		\
+} while (0)
+
+#endif

arch/um/include/asm/ptrace-generic.h

+/* 
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PTRACE_GENERIC_H
+#define __UM_PTRACE_GENERIC_H
+
+#ifndef __ASSEMBLY__
+
+#include <asm/ptrace-abi.h>
+#include <asm/user.h>
+#include "sysdep/ptrace.h"
+
+struct pt_regs {
+	struct uml_pt_regs regs;
+};
+
+#define EMPTY_REGS { .regs = EMPTY_UML_PT_REGS }
+
+#define PT_REGS_IP(r) UPT_IP(&(r)->regs)
+#define PT_REGS_SP(r) UPT_SP(&(r)->regs)
+
+#define PT_REG(r, reg) UPT_REG(&(r)->regs, reg)
+#define PT_REGS_SET(r, reg, val) UPT_SET(&(r)->regs, reg, val)
+
+#define PT_REGS_SET_SYSCALL_RETURN(r, res) \
+	UPT_SET_SYSCALL_RETURN(&(r)->regs, res)
+#define PT_REGS_RESTART_SYSCALL(r) UPT_RESTART_SYSCALL(&(r)->regs)
+
+#define PT_REGS_SYSCALL_NR(r) UPT_SYSCALL_NR(&(r)->regs)
+
+#define PT_REGS_SC(r) UPT_SC(&(r)->regs)
+
+#define instruction_pointer(regs) PT_REGS_IP(regs)
+
+struct task_struct;
+
+extern long subarch_ptrace(struct task_struct *child, long request, long addr,
+			   long data);
+extern unsigned long getreg(struct task_struct *child, int regno);
+extern int putreg(struct task_struct *child, int regno, unsigned long value);
+extern int get_fpregs(struct user_i387_struct __user *buf,
+		      struct task_struct *child);
+extern int set_fpregs(struct user_i387_struct __user *buf,
+		      struct task_struct *child);
+
+extern void show_regs(struct pt_regs *regs);
+
+extern int arch_copy_tls(struct task_struct *new);
+extern void clear_flushed_tls(struct task_struct *task);
+
+#endif
+
+#endif

arch/um/include/asm/system.h

+#ifndef __UM_SYSTEM_GENERIC_H
+#define __UM_SYSTEM_GENERIC_H
+
+#include "sysdep/system.h"
+
+extern void *switch_to(void *prev, void *next, void *last);
+
+extern int get_signals(void);
+extern int set_signals(int enable);
+extern int get_signals(void);
+extern void block_signals(void);
+extern void unblock_signals(void);
+
+#define local_save_flags(flags) do { typecheck(unsigned long, flags); \
+				     (flags) = get_signals(); } while(0)
+#define local_irq_restore(flags) do { typecheck(unsigned long, flags); \
+				      set_signals(flags); } while(0)
+
+#define local_irq_save(flags) do { local_save_flags(flags); \
+                                   local_irq_disable(); } while(0)
+
+#define local_irq_enable() unblock_signals()
+#define local_irq_disable() block_signals()
+
+#define irqs_disabled()                 \
+({                                      \
+        unsigned long flags;            \
+        local_save_flags(flags);        \
+        (flags == 0);                   \
+})
+
+extern void *_switch_to(void *prev, void *next, void *last);
+#define switch_to(prev, next, last) prev = _switch_to(prev, next, last)
+
+#endif

arch/um/include/common-offsets.h

-/* for use by sys-$SUBARCH/kernel-offsets.c */
-
-DEFINE(KERNEL_MADV_REMOVE, MADV_REMOVE);
-
-OFFSET(HOST_TASK_REGS, task_struct, thread.regs);
-OFFSET(HOST_TASK_PID, task_struct, pid);
-
-DEFINE(UM_KERN_PAGE_SIZE, PAGE_SIZE);
-DEFINE(UM_KERN_PAGE_MASK, PAGE_MASK);
-DEFINE(UM_KERN_PAGE_SHIFT, PAGE_SHIFT);
-DEFINE(UM_NSEC_PER_SEC, NSEC_PER_SEC);
-
-DEFINE_STR(UM_KERN_EMERG, KERN_EMERG);
-DEFINE_STR(UM_KERN_ALERT, KERN_ALERT);
-DEFINE_STR(UM_KERN_CRIT, KERN_CRIT);
-DEFINE_STR(UM_KERN_ERR, KERN_ERR);
-DEFINE_STR(UM_KERN_WARNING, KERN_WARNING);
-DEFINE_STR(UM_KERN_NOTICE, KERN_NOTICE);
-DEFINE_STR(UM_KERN_INFO, KERN_INFO);
-DEFINE_STR(UM_KERN_DEBUG, KERN_DEBUG);
-DEFINE_STR(UM_KERN_CONT, KERN_CONT);
-
-DEFINE(UM_ELF_CLASS, ELF_CLASS);
-DEFINE(UM_ELFCLASS32, ELFCLASS32);
-DEFINE(UM_ELFCLASS64, ELFCLASS64);
-
-DEFINE(UM_NR_CPUS, NR_CPUS);
-
-DEFINE(UM_GFP_KERNEL, GFP_KERNEL);
-DEFINE(UM_GFP_ATOMIC, GFP_ATOMIC);
-
-/* For crypto assembler code. */
-DEFINE(crypto_tfm_ctx_offset, offsetof(struct crypto_tfm, __crt_ctx));
-
-DEFINE(UM_THREAD_SIZE, THREAD_SIZE);
-
-DEFINE(UM_HZ, HZ);
-
-DEFINE(UM_USEC_PER_SEC, USEC_PER_SEC);
-DEFINE(UM_NSEC_PER_SEC, NSEC_PER_SEC);
-DEFINE(UM_NSEC_PER_USEC, NSEC_PER_USEC);

arch/um/include/os.h

-/*
- * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
- */
-
-#ifndef __OS_H__
-#define __OS_H__
-
-#include <stdarg.h>
-#include "irq_user.h"
-#include "longjmp.h"
-#include "mm_id.h"
-#include "sysdep/tls.h"
-#include "../os/include/file.h"
-
-#define CATCH_EINTR(expr) while ((errno = 0, ((expr) < 0)) && (errno == EINTR))
-
-#define OS_TYPE_FILE 1
-#define OS_TYPE_DIR 2
-#define OS_TYPE_SYMLINK 3
-#define OS_TYPE_CHARDEV 4
-#define OS_TYPE_BLOCKDEV 5
-#define OS_TYPE_FIFO 6
-#define OS_TYPE_SOCK 7
-
-/* os_access() flags */
-#define OS_ACC_F_OK    0       /* Test for existence.  */
-#define OS_ACC_X_OK    1       /* Test for execute permission.  */
-#define OS_ACC_W_OK    2       /* Test for write permission.  */
-#define OS_ACC_R_OK    4       /* Test for read permission.  */
-#define OS_ACC_RW_OK   (OS_ACC_W_OK | OS_ACC_R_OK) /* Test for RW permission */
-
-/*
- * types taken from stat_file() in hostfs_user.c
- * (if they are wrong here, they are wrong there...).
- */
-struct uml_stat {
-	int                ust_dev;        /* device */
-	unsigned long long ust_ino;        /* inode */
-	int                ust_mode;       /* protection */
-	int                ust_nlink;      /* number of hard links */
-	int                ust_uid;        /* user ID of owner */
-	int                ust_gid;        /* group ID of owner */
-	unsigned long long ust_size;       /* total size, in bytes */
-	int                ust_blksize;    /* blocksize for filesystem I/O */
-	unsigned long long ust_blocks;     /* number of blocks allocated */
-	unsigned long      ust_atime;      /* time of last access */
-	unsigned long      ust_mtime;      /* time of last modification */
-	unsigned long      ust_ctime;      /* time of last change */
-};
-
-struct openflags {
-	unsigned int r : 1;
-	unsigned int w : 1;
-	unsigned int s : 1;	/* O_SYNC */
-	unsigned int c : 1;	/* O_CREAT */
-	unsigned int t : 1;	/* O_TRUNC */
-	unsigned int a : 1;	/* O_APPEND */
-	unsigned int e : 1;	/* O_EXCL */
-	unsigned int cl : 1;    /* FD_CLOEXEC */
-};
-
-#define OPENFLAGS() ((struct openflags) { .r = 0, .w = 0, .s = 0, .c = 0, \
-					  .t = 0, .a = 0, .e = 0, .cl = 0 })
-
-static inline struct openflags of_read(struct openflags flags)
-{
-	flags.r = 1;
-	return flags;
-}
-
-static inline struct openflags of_write(struct openflags flags)
-{
-	flags.w = 1;
-	return flags;
-}
-
-static inline struct openflags of_rdwr(struct openflags flags)
-{
-	return of_read(of_write(flags));
-}
-
-static inline struct openflags of_set_rw(struct openflags flags, int r, int w)
-{
-	flags.r = r;
-	flags.w = w;
-	return flags;
-}
-
-static inline struct openflags of_sync(struct openflags flags)
-{
-	flags.s = 1;
-	return flags;
-}
-
-static inline struct openflags of_create(struct openflags flags)
-{
-	flags.c = 1;
-	return flags;
-}
-
-static inline struct openflags of_trunc(struct openflags flags)
-{
-	flags.t = 1;
-	return flags;
-}
-
-static inline struct openflags of_append(struct openflags flags)
-{
-	flags.a = 1;
-	return flags;
-}
-
-static inline struct openflags of_excl(struct openflags flags)
-{
-	flags.e = 1;
-	return flags;
-}
-
-static inline struct openflags of_cloexec(struct openflags flags)
-{
-	flags.cl = 1;
-	return flags;
-}
-
-/* file.c */
-extern int os_stat_file(const char *file_name, struct uml_stat *buf);
-extern int os_stat_fd(const int fd, struct uml_stat *buf);
-extern int os_access(const char *file, int mode);
-extern int os_set_exec_close(int fd);
-extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
-extern int os_get_ifname(int fd, char *namebuf);
-extern int os_set_slip(int fd);
-extern int os_mode_fd(int fd, int mode);
-
-extern int os_seek_file(int fd, unsigned long long offset);
-extern int os_open_file(const char *file, struct openflags flags, int mode);
-extern int os_read_file(int fd, void *buf, int len);
-extern int os_write_file(int fd, const void *buf, int count);
-extern int os_file_size(const char *file, unsigned long long *size_out);
-extern int os_file_modtime(const char *file, unsigned long *modtime);
-extern int os_pipe(int *fd, int stream, int close_on_exec);
-extern int os_set_fd_async(int fd);
-extern int os_clear_fd_async(int fd);
-extern int os_set_fd_block(int fd, int blocking);
-extern int os_accept_connection(int fd);
-extern int os_create_unix_socket(const char *file, int len, int close_on_exec);
-extern int os_shutdown_socket(int fd, int r, int w);
-extern void os_close_file(int fd);
-extern int os_rcv_fd(int fd, int *helper_pid_out);
-extern int create_unix_socket(char *file, int len, int close_on_exec);
-extern int os_connect_socket(const char *name);
-extern int os_file_type(char *file);
-extern int os_file_mode(const char *file, struct openflags *mode_out);
-extern int os_lock_file(int fd, int excl);
-extern void os_flush_stdout(void);
-extern int os_stat_filesystem(char *path, long *bsize_out,
-			      long long *blocks_out, long long *bfree_out,
-			      long long *bavail_out, long long *files_out,
-			      long long *ffree_out, void *fsid_out,
-			      int fsid_size, long *namelen_out,
-			      long *spare_out);
-extern int os_change_dir(char *dir);
-extern int os_fchange_dir(int fd);
-
-/* start_up.c */
-extern void os_early_checks(void);
-extern void can_do_skas(void);
-extern void os_check_bugs(void);
-extern void check_host_supports_tls(int *supports_tls, int *tls_min);
-
-/* mem.c */
-extern int create_mem_file(unsigned long long len);
-
-/* process.c */
-extern unsigned long os_process_pc(int pid);
-extern int os_process_parent(int pid);
-extern void os_stop_process(int pid);
-extern void os_kill_process(int pid, int reap_child);
-extern void os_kill_ptraced_process(int pid, int reap_child);
-extern long os_ptrace_ldt(long pid, long addr, long data);
-
-extern int os_getpid(void);
-extern int os_getpgrp(void);
-
-extern void init_new_thread_signals(void);
-extern int run_kernel_thread(int (*fn)(void *), void *arg, jmp_buf **jmp_ptr);
-
-extern int os_map_memory(void *virt, int fd, unsigned long long off,
-			 unsigned long len, int r, int w, int x);
-extern int os_protect_memory(void *addr, unsigned long len,
-			     int r, int w, int x);
-extern int os_unmap_memory(void *addr, int len);
-extern int os_drop_memory(void *addr, int length);
-extern int can_drop_memory(void);
-extern void os_flush_stdout(void);
-
-/* uaccess.c */
-extern unsigned long __do_user_copy(void *to, const void *from, int n,
-				    void **fault_addr, jmp_buf **fault_catcher,
-				    void (*op)(void *to, const void *from,
-					       int n), int *faulted_out);
-
-/* execvp.c */
-extern int execvp_noalloc(char *buf, const char *file, char *const argv[]);
-/* helper.c */
-extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv);
-extern int run_helper_thread(int (*proc)(void *), void *arg,
-			     unsigned int flags, unsigned long *stack_out);
-extern int helper_wait(int pid);
-
-
-/* tls.c */
-extern int os_set_thread_area(user_desc_t *info, int pid);
-extern int os_get_thread_area(user_desc_t *info, int pid);
-
-/* umid.c */
-extern int umid_file_name(char *name, char *buf, int len);
-extern int set_umid(char *name);
-extern char *get_umid(void);
-
-/* signal.c */
-extern void timer_init(void);
-extern void set_sigstack(void *sig_stack, int size);
-extern void remove_sigstack(void);
-extern void set_handler(int sig, void (*handler)(int), int flags, ...);
-extern int change_sig(int signal, int on);
-extern void block_signals(void);
-extern void unblock_signals(void);
-extern int get_signals(void);
-extern int set_signals(int enable);
-
-/* util.c */
-extern void stack_protections(unsigned long address);
-extern int raw(int fd);
-extern void setup_machinename(char *machine_out);
-extern void setup_hostinfo(char *buf, int len);
-extern void os_dump_core(void) __attribute__ ((noreturn));
-
-/* time.c */
-extern void idle_sleep(unsigned long long nsecs);
-extern int set_interval(void);
-extern int timer_one_shot(int ticks);
-extern long long disable_timer(void);
-extern void uml_idle_timer(void);
-extern long long os_nsecs(void);
-
-/* skas/mem.c */
-extern long run_syscall_stub(struct mm_id * mm_idp,
-			     int syscall, unsigned long *args, long expected,
-			     void **addr, int done);
-extern long syscall_stub_data(struct mm_id * mm_idp,
-			      unsigned long *data, int data_count,
-			      void **addr, void **stub_addr);
-extern int map(struct mm_id * mm_idp, unsigned long virt,
-	       unsigned long len, int prot, int phys_fd,
-	       unsigned long long offset, int done, void **data);
-extern int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
-		 int done, void **data);
-extern int protect(struct mm_id * mm_idp, unsigned long addr,
-		   unsigned long len, unsigned int prot, int done, void **data);
-
-/* skas/process.c */
-extern int is_skas_winch(int pid, int fd, void *data);
-extern int start_userspace(unsigned long stub_stack);
-extern int copy_context_skas0(unsigned long stack, int pid);
-extern void userspace(struct uml_pt_regs *regs);
-extern int map_stub_pages(int fd, unsigned long code, unsigned long data,
-			  unsigned long stack);
-extern void new_thread(void *stack, jmp_buf *buf, void (*handler)(void));
-extern void switch_threads(jmp_buf *me, jmp_buf *you);
-extern int start_idle_thread(void *stack, jmp_buf *switch_buf);
-extern void initial_thread_cb_skas(void (*proc)(void *),
-				 void *arg);
-extern void halt_skas(void);
-extern void reboot_skas(void);
-
-/* irq.c */
-extern int os_waiting_for_events(struct irq_fd *active_fds);
-extern int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds);
-extern void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
-		struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2);
-extern void os_free_irq_later(struct irq_fd *active_fds,
-		int irq, void *dev_id);
-extern int os_get_pollfd(int i);
-extern void os_set_pollfd(int i, int fd);
-extern void os_set_ioignore(void);
-
-/* sigio.c */
-extern int add_sigio_fd(int fd);
-extern int ignore_sigio_fd(int fd);
-extern void maybe_sigio_broken(int fd, int read);
-extern void sigio_broken(int fd, int read);
-
-/* sys-x86_64/prctl.c */
-extern int os_arch_prctl(int pid, int code, unsigned long *addr);
-
-/* tty.c */
-extern int get_pty(void);
-
-/* sys-$ARCH/task_size.c */
-extern unsigned long os_get_top_address(void);
-
-#endif

arch/um/include/shared/as-layout.h

+/*
+ * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __START_H__
+#define __START_H__
+
+#include "kern_constants.h"
+
+/*
+ * Stolen from linux/const.h, which can't be directly included since
+ * this is used in userspace code, which has no access to the kernel
+ * headers.  Changed to be suitable for adding casts to the start,
+ * rather than "UL" to the end.
+ */
+
+/* Some constant macros are used in both assembler and
+ * C code.  Therefore we cannot annotate them always with
+ * 'UL' and other type specifiers unilaterally.  We
+ * use the following macros to deal with this.
+ */
+
+#ifdef __ASSEMBLY__
+#define _UML_AC(X, Y)	(Y)
+#else
+#define __UML_AC(X, Y)	(X(Y))
+#define _UML_AC(X, Y)	__UML_AC(X, Y)
+#endif
+
+#define STUB_START _UML_AC(, 0x100000)
+#define STUB_CODE _UML_AC((unsigned long), STUB_START)
+#define STUB_DATA _UML_AC((unsigned long), STUB_CODE + UM_KERN_PAGE_SIZE)
+#define STUB_END _UML_AC((unsigned long), STUB_DATA + UM_KERN_PAGE_SIZE)
+
+#ifndef __ASSEMBLY__
+
+#include "sysdep/ptrace.h"
+
+struct cpu_task {
+	int pid;
+	void *task;
+};
+
+extern struct cpu_task cpu_tasks[];
+
+extern unsigned long low_physmem;
+extern unsigned long high_physmem;
+extern unsigned long uml_physmem;
+extern unsigned long uml_reserved;
+extern unsigned long end_vm;
+extern unsigned long start_vm;
+extern unsigned long long highmem;
+
+extern unsigned long _stext, _etext, _sdata, _edata, __bss_start, _end;
+extern unsigned long _unprotected_end;
+extern unsigned long brk_start;
+
+extern unsigned long host_task_size;
+
+extern int linux_main(int argc, char **argv);
+
+extern void (*sig_info[])(int, struct uml_pt_regs *);
+
+#endif
+
+#endif

arch/um/include/shared/common-offsets.h

+/* for use by sys-$SUBARCH/kernel-offsets.c */
+
+DEFINE(KERNEL_MADV_REMOVE, MADV_REMOVE);
+
+OFFSET(HOST_TASK_REGS, task_struct, thread.regs);
+OFFSET(HOST_TASK_PID, task_struct, pid);
+
+DEFINE(UM_KERN_PAGE_SIZE, PAGE_SIZE);
+DEFINE(UM_KERN_PAGE_MASK, PAGE_MASK);
+DEFINE(UM_KERN_PAGE_SHIFT, PAGE_SHIFT);
+DEFINE(UM_NSEC_PER_SEC, NSEC_PER_SEC);
+
+DEFINE_STR(UM_KERN_EMERG, KERN_EMERG);
+DEFINE_STR(UM_KERN_ALERT, KERN_ALERT);
+DEFINE_STR(UM_KERN_CRIT, KERN_CRIT);
+DEFINE_STR(UM_KERN_ERR, KERN_ERR);
+DEFINE_STR(UM_KERN_WARNING, KERN_WARNING);
+DEFINE_STR(UM_KERN_NOTICE, KERN_NOTICE);
+DEFINE_STR(UM_KERN_INFO, KERN_INFO);
+DEFINE_STR(UM_KERN_DEBUG, KERN_DEBUG);
+DEFINE_STR(UM_KERN_CONT, KERN_CONT);
+
+DEFINE(UM_ELF_CLASS, ELF_CLASS);
+DEFINE(UM_ELFCLASS32, ELFCLASS32);
+DEFINE(UM_ELFCLASS64, ELFCLASS64);
+
+DEFINE(UM_NR_CPUS, NR_CPUS);
+
+DEFINE(UM_GFP_KERNEL, GFP_KERNEL);
+DEFINE(UM_GFP_ATOMIC, GFP_ATOMIC);
+
+/* For crypto assembler code. */
+DEFINE(crypto_tfm_ctx_offset, offsetof(struct crypto_tfm, __crt_ctx));
+
+DEFINE(UM_THREAD_SIZE, THREAD_SIZE);
+
+DEFINE(UM_HZ, HZ);
+
+DEFINE(UM_USEC_PER_SEC, USEC_PER_SEC);
+DEFINE(UM_NSEC_PER_SEC, NSEC_PER_SEC);
+DEFINE(UM_NSEC_PER_USEC, NSEC_PER_USEC);
+
+#ifdef CONFIG_PRINTK
+DEFINE(UML_CONFIG_PRINTK, CONFIG_PRINTK);
+#endif
+#ifdef CONFIG_NO_HZ
+DEFINE(UML_CONFIG_NO_HZ, CONFIG_NO_HZ);
+#endif
+#ifdef CONFIG_UML_X86
+DEFINE(UML_CONFIG_UML_X86, CONFIG_UML_X86);
+#endif
+#ifdef CONFIG_64BIT
+DEFINE(UML_CONFIG_64BIT, CONFIG_64BIT);
+#endif

arch/um/include/shared/ldt.h

+/*
+ * Copyright (C) 2004 Fujitsu Siemens Computers GmbH
+ * Licensed under the GPL
+ *
+ * Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
+ */
+
+#ifndef __ASM_LDT_H
+#define __ASM_LDT_H
+
+#include <linux/mutex.h>
+#include <sysdep/host_ldt.h>
+
+extern void ldt_host_info(void);
+
+#define LDT_PAGES_MAX \
+	((LDT_ENTRIES * LDT_ENTRY_SIZE)/PAGE_SIZE)
+#define LDT_ENTRIES_PER_PAGE \
+	(PAGE_SIZE/LDT_ENTRY_SIZE)
+#define LDT_DIRECT_ENTRIES \
+	((LDT_PAGES_MAX*sizeof(void *))/LDT_ENTRY_SIZE)
+
+struct ldt_entry {
+	__u32 a;
+	__u32 b;
+};
+
+typedef struct uml_ldt {
+	int entry_count;
+	struct mutex lock;
+	union {
+		struct ldt_entry * pages[LDT_PAGES_MAX];
+		struct ldt_entry entries[LDT_DIRECT_ENTRIES];
+	} u;
+} uml_ldt_t;
+
+#endif

arch/um/include/shared/os.h

+/*
+ * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __OS_H__
+#define __OS_H__
+
+#include <stdarg.h>
+#include "irq_user.h"
+#include "longjmp.h"
+#include "mm_id.h"
+#include "sysdep/tls.h"
+
+#define CATCH_EINTR(expr) while ((errno = 0, ((expr) < 0)) && (errno == EINTR))
+
+#define OS_TYPE_FILE 1
+#define OS_TYPE_DIR 2
+#define OS_TYPE_SYMLINK 3
+#define OS_TYPE_CHARDEV 4
+#define OS_TYPE_BLOCKDEV 5
+#define OS_TYPE_FIFO 6
+#define OS_TYPE_SOCK 7
+
+/* os_access() flags */
+#define OS_ACC_F_OK    0       /* Test for existence.  */
+#define OS_ACC_X_OK    1       /* Test for execute permission.  */
+#define OS_ACC_W_OK    2       /* Test for write permission.  */
+#define OS_ACC_R_OK    4       /* Test for read permission.  */
+#define OS_ACC_RW_OK   (OS_ACC_W_OK | OS_ACC_R_OK) /* Test for RW permission */
+
+/*
+ * types taken from stat_file() in hostfs_user.c
+ * (if they are wrong here, they are wrong there...).
+ */
+struct uml_stat {
+	int                ust_dev;        /* device */
+	unsigned long long ust_ino;        /* inode */
+	int                ust_mode;       /* protection */
+	int                ust_nlink;      /* number of hard links */
+	int                ust_uid;        /* user ID of owner */
+	int                ust_gid;        /* group ID of owner */
+	unsigned long long ust_size;       /* total size, in bytes */
+	int                ust_blksize;    /* blocksize for filesystem I/O */
+	unsigned long long ust_blocks;     /* number of blocks allocated */
+	unsigned long      ust_atime;      /* time of last access */
+	unsigned long      ust_mtime;      /* time of last modification */
+	unsigned long      ust_ctime;      /* time of last change */
+};
+
+struct openflags {
+	unsigned int r : 1;
+	unsigned int w : 1;
+	unsigned int s : 1;	/* O_SYNC */
+	unsigned int c : 1;	/* O_CREAT */
+	unsigned int t : 1;	/* O_TRUNC */
+	unsigned int a : 1;	/* O_APPEND */
+	unsigned int e : 1;	/* O_EXCL */
+	unsigned int cl : 1;    /* FD_CLOEXEC */
+};
+
+#define OPENFLAGS() ((struct openflags) { .r = 0, .w = 0, .s = 0, .c = 0, \
+					  .t = 0, .a = 0, .e = 0, .cl = 0 })
+
+static inline struct openflags of_read(struct openflags flags)
+{
+	flags.r = 1;
+	return flags;
+}
+
+static inline struct openflags of_write(struct openflags flags)
+{
+	flags.w = 1;
+	return flags;
+}
+
+static inline struct openflags of_rdwr(struct openflags flags)
+{
+	return of_read(of_write(flags));
+}
+
+static inline struct openflags of_set_rw(struct openflags flags, int r, int w)
+{
+	flags.r = r;
+	flags.w = w;
+	return flags;
+}
+
+static inline struct openflags of_sync(struct openflags flags)
+{
+	flags.s = 1;
+	return flags;
+}
+
+static inline struct openflags of_create(struct openflags flags)
+{
+	flags.c = 1;
+	return flags;
+}
+
+static inline struct openflags of_trunc(struct openflags flags)
+{
+	flags.t = 1;
+	return flags;
+}
+
+static inline struct openflags of_append(struct openflags flags)
+{
+	flags.a = 1;
+	return flags;
+}
+
+static inline struct openflags of_excl(struct openflags flags)
+{
+	flags.e = 1;
+	return flags;
+}
+
+static inline struct openflags of_cloexec(struct openflags flags)
+{
+	flags.cl = 1;
+	return flags;
+}
+
+/* file.c */
+extern int os_stat_file(const char *file_name, struct uml_stat *buf);
+extern int os_stat_fd(const int fd, struct uml_stat *buf);
+extern int os_access(const char *file, int mode);
+extern int os_set_exec_close(int fd);
+extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
+extern int os_get_ifname(int fd, char *namebuf);
+extern int os_set_slip(int fd);
+extern int os_mode_fd(int fd, int mode);
+
+extern int os_seek_file(int fd, unsigned long long offset);
+extern int os_open_file(const char *file, struct openflags flags, int mode);
+extern int os_read_file(int fd, void *buf, int len);
+extern int os_write_file(int fd, const void *buf, int count);
+extern int os_file_size(const char *file, unsigned long long *size_out);
+extern int os_file_modtime(const char *file, unsigned long *modtime);
+extern int os_pipe(int *fd, int stream, int close_on_exec);
+extern int os_set_fd_async(int fd);
+extern int os_clear_fd_async(int fd);
+extern int os_set_fd_block(int fd, int blocking);
+extern int os_accept_connection(int fd);
+extern int os_create_unix_socket(const char *file, int len, int close_on_exec);
+extern int os_shutdown_socket(int fd, int r, int w);
+extern void os_close_file(int fd);
+extern int os_rcv_fd(int fd, int *helper_pid_out);
+extern int create_unix_socket(char *file, int len, int close_on_exec);
+extern int os_connect_socket(const char *name);
+extern int os_file_type(char *file);
+extern int os_file_mode(const char *file, struct openflags *mode_out);
+extern int os_lock_file(int fd, int excl);
+extern void os_flush_stdout(void);
+extern int os_stat_filesystem(char *path, long *bsize_out,
+			      long long *blocks_out, long long *bfree_out,
+			      long long *bavail_out, long long *files_out,
+			      long long *ffree_out, void *fsid_out,
+			      int fsid_size, long *namelen_out,
+			      long *spare_out);
+extern int os_change_dir(char *dir);
+extern int os_fchange_dir(int fd);
+
+/* start_up.c */
+extern void os_early_checks(void);
+extern void can_do_skas(void);
+extern void os_check_bugs(void);
+extern void check_host_supports_tls(int *supports_tls, int *tls_min);
+
+/* mem.c */
+extern int create_mem_file(unsigned long long len);
+
+/* process.c */
+extern unsigned long os_process_pc(int pid);
+extern int os_process_parent(int pid);
+extern void os_stop_process(int pid);
+extern void os_kill_process(int pid, int reap_child);
+extern void os_kill_ptraced_process(int pid, int reap_child);
+extern long os_ptrace_ldt(long pid, long addr, long data);
+
+extern int os_getpid(void);
+extern int os_getpgrp(void);
+
+extern void init_new_thread_signals(void);
+extern int run_kernel_thread(int (*fn)(void *), void *arg, jmp_buf **jmp_ptr);
+
+extern int os_map_memory(void *virt, int fd, unsigned long long off,
+			 unsigned long len, int r, int w, int x);
+extern int os_protect_memory(void *addr, unsigned long len,
+			     int r, int w, int x);
+extern int os_unmap_memory(void *addr, int len);
+extern int os_drop_memory(void *addr, int length);
+extern int can_drop_memory(void);
+extern void os_flush_stdout(void);
+
+/* uaccess.c */
+extern unsigned long __do_user_copy(void *to, const void *from, int n,
+				    void **fault_addr, jmp_buf **fault_catcher,
+				    void (*op)(void *to, const void *from,
+					       int n), int *faulted_out);
+
+/* execvp.c */
+extern int execvp_noalloc(char *buf, const char *file, char *const argv[]);
+/* helper.c */
+extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv);
+extern int run_helper_thread(int (*proc)(void *), void *arg,
+			     unsigned int flags, unsigned long *stack_out);
+extern int helper_wait(int pid);
+
+
+/* tls.c */
+extern int os_set_thread_area(user_desc_t *info, int pid);
+extern int os_get_thread_area(user_desc_t *info, int pid);
+
+/* umid.c */
+extern int umid_file_name(char *name, char *buf, int len);
+extern int set_umid(char *name);
+extern char *get_umid(void);
+
+/* signal.c */
+extern void timer_init(void);
+extern void set_sigstack(void *sig_stack, int size);
+extern void remove_sigstack(void);
+extern void set_handler(int sig, void (*handler)(int), int flags, ...);
+extern int change_sig(int signal, int on);
+extern void block_signals(void);
+extern void unblock_signals(void);
+extern int get_signals(void);
+extern int set_signals(int enable);
+
+/* util.c */
+extern void stack_protections(unsigned long address);
+extern int raw(int fd);
+extern void setup_machinename(char *machine_out);
+extern void setup_hostinfo(char *buf, int len);
+extern void os_dump_core(void) __attribute__ ((noreturn));
+
+/* time.c */
+extern void idle_sleep(unsigned long long nsecs);
+extern int set_interval(void);
+extern int timer_one_shot(int ticks);
+extern long long disable_timer(void);
+extern void uml_idle_timer(void);
+extern long long os_nsecs(void);
+
+/* skas/mem.c */
+extern long run_syscall_stub(struct mm_id * mm_idp,
+			     int syscall, unsigned long *args, long expected,
+			     void **addr, int done);
+extern long syscall_stub_data(struct mm_id * mm_idp,
+			      unsigned long *data, int data_count,
+			      void **addr, void **stub_addr);
+extern int map(struct mm_id * mm_idp, unsigned long virt,
+	       unsigned long len, int prot, int phys_fd,
+	       unsigned long long offset, int done, void **data);
+extern int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
+		 int done, void **data);
+extern int protect(struct mm_id * mm_idp, unsigned long addr,
+		   unsigned long len, unsigned int prot, int done, void **data);
+
+/* skas/process.c */
+extern int is_skas_winch(int pid, int fd, void *data);
+extern int start_userspace(unsigned long stub_stack);
+extern int copy_context_skas0(unsigned long stack, int pid);
+extern void userspace(struct uml_pt_regs *regs);
+extern int map_stub_pages(int fd, unsigned long code, unsigned long data,
+			  unsigned long stack);
+extern void new_thread(void *stack, jmp_buf *buf, void (*handler)(void));
+extern void switch_threads(jmp_buf *me, jmp_buf *you);
+extern int start_idle_thread(void *stack, jmp_buf *switch_buf);
+extern void initial_thread_cb_skas(void (*proc)(void *),
+				 void *arg);
+extern void halt_skas(void);
+extern void reboot_skas(void);
+
+/* irq.c */
+extern int os_waiting_for_events(struct irq_fd *active_fds);
+extern int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds);
+extern void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
+		struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2);
+extern void os_free_irq_later(struct irq_fd *active_fds,
+		int irq, void *dev_id);
+extern int os_get_pollfd(int i);
+extern void os_set_pollfd(int i, int fd);
+extern void os_set_ioignore(void);
+
+/* sigio.c */
+extern int add_sigio_fd(int fd);
+extern int ignore_sigio_fd(int fd);
+extern void maybe_sigio_broken(int fd, int read);
+extern void sigio_broken(int fd, int read);
+
+/* sys-x86_64/prctl.c */
+extern int os_arch_prctl(int pid, int code, unsigned long *addr);
+
+/* tty.c */
+extern int get_pty(void);
+
+/* sys-$ARCH/task_size.c */
+extern unsigned long os_get_top_address(void);
+
+#endif