2007-08-14 22:09:33

by Jeff Dike

Subject: [PATCH 6/14] UML - Remove code made redundant by CHOOSE_MODE removal

This patch makes a number of simplifications enabled by the removal of
CHOOSE_MODE. There were lots of functions that looked like

int foo(args){
foo_skas(args);
}

The bodies of foo_skas are now folded into foo, and their declarations
(and sometimes entire header files) are deleted.

In addition, the union uml_pt_regs, which was a union between the tt
and skas register formats, is now a struct, with the tt-mode arm of
the union being removed.

It turns out that usr2_handler was unused, so it is gone.

Signed-off-by: Jeff Dike <[email protected]>
--
arch/um/drivers/harddog_user.c | 1
arch/um/include/arch.h | 4
arch/um/include/as-layout.h | 2
arch/um/include/irq_user.h | 2
arch/um/include/kern_util.h | 19 ++-
arch/um/include/mconsole.h | 2
arch/um/include/mode.h | 11 --
arch/um/include/mode_kern.h | 11 --
arch/um/include/os.h | 6 -
arch/um/include/registers.h | 6 -
arch/um/include/skas/mmu-skas.h | 2
arch/um/include/skas/mode_kern_skas.h | 42 --------
arch/um/include/skas/skas.h | 2
arch/um/include/sysdep-i386/ptrace.h | 59 +++++------
arch/um/include/sysdep-x86_64/ptrace.h | 88 ++++++++---------
arch/um/include/task.h | 2
arch/um/kernel/exec.c | 20 +++-
arch/um/kernel/irq.c | 4
arch/um/kernel/physmem.c | 4
arch/um/kernel/process.c | 120 +++++++++++++++++++-----
arch/um/kernel/ptrace.c | 6 -
arch/um/kernel/reboot.c | 21 +++-
arch/um/kernel/signal.c | 1
arch/um/kernel/skas/Makefile | 2
arch/um/kernel/skas/exec.c | 40 --------
arch/um/kernel/skas/mem.c | 22 ----
arch/um/kernel/skas/mmu.c | 4
arch/um/kernel/skas/process.c | 158 +------------------------------
arch/um/kernel/skas/syscall.c | 4
arch/um/kernel/skas/tlb.c | 164 ---------------------------------
arch/um/kernel/syscall.c | 1
arch/um/kernel/time.c | 7 -
arch/um/kernel/tlb.c | 134 +++++++++++++++++++++++++-
arch/um/kernel/trap.c | 10 +-
arch/um/kernel/um_arch.c | 22 +++-
arch/um/os-Linux/aio.c | 1
arch/um/os-Linux/main.c | 1
arch/um/os-Linux/process.c | 3
arch/um/os-Linux/registers.c | 12 +-
arch/um/os-Linux/signal.c | 5 -
arch/um/os-Linux/skas/mem.c | 4
arch/um/os-Linux/skas/process.c | 24 ++--
arch/um/os-Linux/skas/trap.c | 14 +-
arch/um/os-Linux/start_up.c | 1
arch/um/os-Linux/trap.c | 8 -
arch/um/os-Linux/umid.c | 1
arch/um/sys-i386/bugs.c | 2
arch/um/sys-i386/fault.c | 2
arch/um/sys-i386/ldt.c | 7 -
arch/um/sys-i386/ptrace.c | 10 +-
arch/um/sys-i386/signal.c | 86 +++++++----------
arch/um/sys-i386/tls.c | 4
arch/um/sys-x86_64/bugs.c | 2
arch/um/sys-x86_64/fault.c | 2
arch/um/sys-x86_64/signal.c | 35 +------
arch/um/sys-x86_64/syscalls.c | 9 -
arch/um/sys-x86_64/tls.c | 2
include/asm-um/mmu_context.h | 20 ----
include/asm-um/processor-generic.h | 16 +--
include/asm-um/ptrace-generic.h | 4
include/asm-um/ptrace-i386.h | 17 ---
include/asm-um/ptrace-x86_64.h | 13 --
include/asm-um/tlbflush.h | 13 --
63 files changed, 512 insertions(+), 809 deletions(-)

Index: linux-2.6.22/arch/um/include/skas/mode_kern_skas.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/skas/mode_kern_skas.h 2007-08-13 14:19:07.000000000 -0400
+++ /dev/null 1970-01-01 00:00:00.000000000 +0000
@@ -1,42 +0,0 @@
-/*
- * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
- * Licensed under the GPL
- */
-
-#ifndef __SKAS_MODE_KERN_H__
-#define __SKAS_MODE_KERN_H__
-
-#include "linux/sched.h"
-#include "asm/page.h"
-#include "asm/ptrace.h"
-#include "mem_user.h"
-
-extern void flush_thread_skas(void);
-extern void switch_to_skas(void *prev, void *next);
-extern void start_thread_skas(struct pt_regs *regs, unsigned long eip,
- unsigned long esp);
-extern int copy_thread_skas(int nr, unsigned long clone_flags,
- unsigned long sp, unsigned long stack_top,
- struct task_struct *p, struct pt_regs *regs);
-extern void release_thread_skas(struct task_struct *task);
-extern void init_idle_skas(void);
-extern void flush_tlb_kernel_range_skas(unsigned long start,
- unsigned long end);
-extern void flush_tlb_kernel_vm_skas(void);
-extern void __flush_tlb_one_skas(unsigned long addr);
-extern void flush_tlb_range_skas(struct vm_area_struct *vma,
- unsigned long start, unsigned long end);
-extern void flush_tlb_mm_skas(struct mm_struct *mm);
-extern void force_flush_all_skas(void);
-extern long execute_syscall_skas(void *r);
-extern void before_mem_skas(unsigned long unused);
-extern unsigned long set_task_sizes_skas(unsigned long *task_size_out);
-extern int start_uml_skas(void);
-extern int external_pid_skas(struct task_struct *task);
-extern int thread_pid_skas(struct task_struct *task);
-extern void flush_tlb_page_skas(struct vm_area_struct *vma,
- unsigned long address);
-
-#define kmem_end_skas (host_task_size - 1024 * 1024)
-
-#endif
Index: linux-2.6.22/arch/um/kernel/exec.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/exec.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/exec.c 2007-08-13 17:14:24.000000000 -0400
@@ -18,17 +18,31 @@
#include "irq_user.h"
#include "tlb.h"
#include "os.h"
-#include "mode_kern.h"
+#include "skas/skas.h"

void flush_thread(void)
{
+ void *data = NULL;
+ unsigned long end = proc_mm ? task_size : CONFIG_STUB_START;
+ int ret;
+
arch_flush_thread(&current->thread.arch);
- flush_thread_skas();
+
+ ret = unmap(&current->mm->context.skas.id, 0, end, 1, &data);
+ if(ret){
+ printk("flush_thread - clearing address space failed, "
+ "err = %d\n", ret);
+ force_sig(SIGKILL, current);
+ }
+
+ __switch_mm(&current->mm->context.skas.id);
}

void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
{
- start_thread_skas(regs, eip, esp);
+ set_fs(USER_DS);
+ PT_REGS_IP(regs) = eip;
+ PT_REGS_SP(regs) = esp;
}

#ifdef CONFIG_TTY_LOG
Index: linux-2.6.22/arch/um/kernel/skas/exec.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/skas/exec.c 2007-08-13 14:19:07.000000000 -0400
+++ /dev/null 1970-01-01 00:00:00.000000000 +0000
@@ -1,40 +0,0 @@
-/*
- * Copyright (C) 2002 Jeff Dike ([email protected])
- * Licensed under the GPL
- */
-
-#include "linux/kernel.h"
-#include "asm/current.h"
-#include "asm/page.h"
-#include "asm/signal.h"
-#include "asm/ptrace.h"
-#include "asm/uaccess.h"
-#include "asm/mmu_context.h"
-#include "tlb.h"
-#include "skas.h"
-#include "um_mmu.h"
-#include "os.h"
-
-void flush_thread_skas(void)
-{
- void *data = NULL;
- unsigned long end = proc_mm ? task_size : CONFIG_STUB_START;
- int ret;
-
- ret = unmap(&current->mm->context.skas.id, 0, end, 1, &data);
- if(ret){
- printk("flush_thread_skas - clearing address space failed, "
- "err = %d\n", ret);
- force_sig(SIGKILL, current);
- }
-
- switch_mm_skas(&current->mm->context.skas.id);
-}
-
-void start_thread_skas(struct pt_regs *regs, unsigned long eip,
- unsigned long esp)
-{
- set_fs(USER_DS);
- PT_REGS_IP(regs) = eip;
- PT_REGS_SP(regs) = esp;
-}
Index: linux-2.6.22/arch/um/include/mode.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/mode.h 2007-08-13 14:21:31.000000000 -0400
+++ /dev/null 1970-01-01 00:00:00.000000000 +0000
@@ -1,11 +0,0 @@
-/*
- * Copyright (C) 2002 Jeff Dike ([email protected])
- * Licensed under the GPL
- */
-
-#ifndef __MODE_H__
-#define __MODE_H__
-
-#include "mode-skas.h"
-
-#endif
Index: linux-2.6.22/arch/um/kernel/physmem.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/physmem.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/physmem.c 2007-08-13 17:14:24.000000000 -0400
@@ -10,7 +10,7 @@
#include "as-layout.h"
#include "init.h"
#include "kern.h"
-#include "mode_kern.h"
+#include "mem_user.h"
#include "os.h"

static int physmem_fd = -1;
@@ -61,7 +61,7 @@ static unsigned long kmem_top = 0;
unsigned long get_kmem_end(void)
{
if (kmem_top == 0)
- kmem_top = kmem_end_skas;
+ kmem_top = host_task_size - 1024 * 1024;
return kmem_top;
}

Index: linux-2.6.22/arch/um/kernel/process.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/process.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/process.c 2007-08-13 17:14:24.000000000 -0400
@@ -43,8 +43,7 @@
#include "frame_kern.h"
#include "sigcontext.h"
#include "os.h"
-#include "mode.h"
-#include "mode_kern.h"
+#include "skas.h"

/* This is a per-cpu array. A processor only modifies its entry and it only
* cares about its entry, so it's OK if another processor is modifying its
@@ -54,7 +53,8 @@ struct cpu_task cpu_tasks[NR_CPUS] = { [

static inline int external_pid(struct task_struct *task)
{
- return external_pid_skas(task);
+ /* FIXME: Need to look up userspace_pid by cpu */
+ return(userspace_pid[0]);
}

int pid_to_processor_id(int pid)
@@ -104,6 +104,8 @@ static inline void set_current(struct ta
{ external_pid(task), task });
}

+extern void arch_switch_to(struct task_struct *from, struct task_struct *to);
+
void *_switch_to(void *prev, void *next, void *last)
{
struct task_struct *from = prev;
@@ -114,7 +116,19 @@ void *_switch_to(void *prev, void *next,

do {
current->thread.saved_task = NULL;
- switch_to_skas(prev, next);
+
+ /* XXX need to check runqueues[cpu].idle */
+ if(current->pid == 0)
+ switch_timers(0);
+
+ switch_threads(&from->thread.switch_buf,
+ &to->thread.switch_buf);
+
+ arch_switch_to(current->thread.prev_sched, current);
+
+ if(current->pid == 0)
+ switch_timers(1);
+
if(current->thread.saved_task)
show_regs(&(current->thread.regs));
next= current->thread.saved_task;
@@ -133,11 +147,6 @@ void interrupt_end(void)
do_signal();
}

-void release_thread(struct task_struct *task)
-{
- release_thread_skas(task);
-}
-
void exit_thread(void)
{
}
@@ -147,27 +156,95 @@ void *get_current(void)
return current;
}

+extern void schedule_tail(struct task_struct *prev);
+
+/* This is called magically, by its address being stuffed in a jmp_buf
+ * and being longjmp-d to.
+ */
+void new_thread_handler(void)
+{
+ int (*fn)(void *), n;
+ void *arg;
+
+ if(current->thread.prev_sched != NULL)
+ schedule_tail(current->thread.prev_sched);
+ current->thread.prev_sched = NULL;
+
+ fn = current->thread.request.u.thread.proc;
+ arg = current->thread.request.u.thread.arg;
+
+ /* The return value is 1 if the kernel thread execs a process,
+ * 0 if it just exits
+ */
+ n = run_kernel_thread(fn, arg, &current->thread.exec_buf);
+ if(n == 1){
+ /* Handle any immediate reschedules or signals */
+ interrupt_end();
+ userspace(&current->thread.regs.regs);
+ }
+ else do_exit(0);
+}
+
+/* Called magically, see new_thread_handler above */
+void fork_handler(void)
+{
+ force_flush_all();
+ if(current->thread.prev_sched == NULL)
+ panic("blech");
+
+ schedule_tail(current->thread.prev_sched);
+
+ /* XXX: if interrupt_end() calls schedule, this call to
+ * arch_switch_to isn't needed. We could want to apply this to
+ * improve performance. -bb */
+ arch_switch_to(current->thread.prev_sched, current);
+
+ current->thread.prev_sched = NULL;
+
+ /* Handle any immediate reschedules or signals */
+ interrupt_end();
+
+ userspace(&current->thread.regs.regs);
+}
+
int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
unsigned long stack_top, struct task_struct * p,
struct pt_regs *regs)
{
- int ret;
+ void (*handler)(void);
+ int ret = 0;

p->thread = (struct thread_struct) INIT_THREAD;
- ret = copy_thread_skas(nr, clone_flags, sp, stack_top, p, regs);

- if (ret || !current->thread.forking)
- goto out;
+ if(current->thread.forking){
+ memcpy(&p->thread.regs.regs, &regs->regs,
+ sizeof(p->thread.regs.regs));
+ REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.regs, 0);
+ if(sp != 0)
+ REGS_SP(p->thread.regs.regs.regs) = sp;

- clear_flushed_tls(p);
+ handler = fork_handler;

- /*
- * Set a new TLS for the child thread?
- */
- if (clone_flags & CLONE_SETTLS)
- ret = arch_copy_tls(p);
+ arch_copy_thread(&current->thread.arch, &p->thread.arch);
+ }
+ else {
+ init_thread_registers(&p->thread.regs.regs);
+ p->thread.request.u.thread = current->thread.request.u.thread;
+ handler = new_thread_handler;
+ }
+
+ new_thread(task_stack_page(p), &p->thread.switch_buf, handler);
+
+ if (current->thread.forking) {
+ clear_flushed_tls(p);
+
+ /*
+ * Set a new TLS for the child thread?
+ */
+ if (clone_flags & CLONE_SETTLS)
+ ret = arch_copy_tls(p);
+ }

-out:
return ret;
}

@@ -198,7 +275,8 @@ void default_idle(void)

void cpu_idle(void)
{
- init_idle_skas();
+ cpu_tasks[current_thread->cpu].pid = os_getpid();
+ default_idle();
}

void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
Index: linux-2.6.22/arch/um/kernel/reboot.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/reboot.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/reboot.c 2007-08-13 17:14:24.000000000 -0400
@@ -9,13 +9,30 @@
#include "kern_util.h"
#include "kern.h"
#include "os.h"
-#include "mode.h"
+#include "skas.h"

void (*pm_power_off)(void);

static void kill_off_processes(void)
{
- kill_off_processes_skas();
+ if(proc_mm)
+ /*
+ * FIXME: need to loop over userspace_pids
+ */
+ os_kill_ptraced_process(userspace_pid[0], 1);
+ else {
+ struct task_struct *p;
+ int pid, me;
+
+ me = os_getpid();
+ for_each_process(p){
+ if(p->mm == NULL)
+ continue;
+
+ pid = p->mm->context.skas.id.u.pid;
+ os_kill_ptraced_process(pid, 1);
+ }
+ }
}

void uml_cleanup(void)
Index: linux-2.6.22/arch/um/kernel/skas/mem.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/skas/mem.c 2007-08-13 14:19:07.000000000 -0400
+++ /dev/null 1970-01-01 00:00:00.000000000 +0000
@@ -1,22 +0,0 @@
-/*
- * Copyright (C) 2002 Jeff Dike ([email protected])
- * Licensed under the GPL
- */
-
-#include "linux/mm.h"
-#include "asm/pgtable.h"
-#include "mem_user.h"
-#include "skas.h"
-
-unsigned long set_task_sizes_skas(unsigned long *task_size_out)
-{
- /* Round up to the nearest 4M */
- unsigned long host_task_size = ROUND_4M((unsigned long)
- &host_task_size);
-
- if (!skas_needs_stub)
- *task_size_out = host_task_size;
- else *task_size_out = CONFIG_STUB_START & PGDIR_MASK;
-
- return host_task_size;
-}
Index: linux-2.6.22/arch/um/kernel/skas/process.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/skas/process.c 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/skas/process.c 2007-08-13 17:14:24.000000000 -0400
@@ -18,129 +18,22 @@
#include "os.h"
#include "tlb.h"
#include "kern.h"
-#include "mode.h"
#include "registers.h"

-void switch_to_skas(void *prev, void *next)
-{
- struct task_struct *from, *to;
-
- from = prev;
- to = next;
-
- /* XXX need to check runqueues[cpu].idle */
- if(current->pid == 0)
- switch_timers(0);
-
- switch_threads(&from->thread.mode.skas.switch_buf,
- &to->thread.mode.skas.switch_buf);
-
- arch_switch_to_skas(current->thread.prev_sched, current);
-
- if(current->pid == 0)
- switch_timers(1);
-}
-
extern void schedule_tail(struct task_struct *prev);

-/* This is called magically, by its address being stuffed in a jmp_buf
- * and being longjmp-d to.
- */
-void new_thread_handler(void)
-{
- int (*fn)(void *), n;
- void *arg;
-
- if(current->thread.prev_sched != NULL)
- schedule_tail(current->thread.prev_sched);
- current->thread.prev_sched = NULL;
-
- fn = current->thread.request.u.thread.proc;
- arg = current->thread.request.u.thread.arg;
-
- /* The return value is 1 if the kernel thread execs a process,
- * 0 if it just exits
- */
- n = run_kernel_thread(fn, arg, &current->thread.exec_buf);
- if(n == 1){
- /* Handle any immediate reschedules or signals */
- interrupt_end();
- userspace(&current->thread.regs.regs);
- }
- else do_exit(0);
-}
-
-void release_thread_skas(struct task_struct *task)
-{
-}
-
-/* Called magically, see new_thread_handler above */
-void fork_handler(void)
-{
- force_flush_all();
- if(current->thread.prev_sched == NULL)
- panic("blech");
-
- schedule_tail(current->thread.prev_sched);
-
- /* XXX: if interrupt_end() calls schedule, this call to
- * arch_switch_to_skas isn't needed. We could want to apply this to
- * improve performance. -bb */
- arch_switch_to_skas(current->thread.prev_sched, current);
-
- current->thread.prev_sched = NULL;
-
-/* Handle any immediate reschedules or signals */
- interrupt_end();
-
- userspace(&current->thread.regs.regs);
-}
-
-int copy_thread_skas(int nr, unsigned long clone_flags, unsigned long sp,
- unsigned long stack_top, struct task_struct * p,
- struct pt_regs *regs)
-{
- void (*handler)(void);
-
- if(current->thread.forking){
- memcpy(&p->thread.regs.regs.skas, &regs->regs.skas,
- sizeof(p->thread.regs.regs.skas));
- REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.skas.regs, 0);
- if(sp != 0) REGS_SP(p->thread.regs.regs.skas.regs) = sp;
-
- handler = fork_handler;
-
- arch_copy_thread(&current->thread.arch, &p->thread.arch);
- }
- else {
- init_thread_registers(&p->thread.regs.regs);
- p->thread.request.u.thread = current->thread.request.u.thread;
- handler = new_thread_handler;
- }
-
- new_thread(task_stack_page(p), &p->thread.mode.skas.switch_buf,
- handler);
- return(0);
-}
-
int new_mm(unsigned long stack)
{
int fd;

fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
if(fd < 0)
- return(fd);
+ return fd;

if(skas_needs_stub)
map_stub_pages(fd, CONFIG_STUB_CODE, CONFIG_STUB_DATA, stack);

- return(fd);
-}
-
-void init_idle_skas(void)
-{
- cpu_tasks[current_thread->cpu].pid = os_getpid();
- default_idle();
+ return fd;
}

extern void start_kernel(void);
@@ -158,14 +51,14 @@ static int __init start_kernel_proc(void
cpu_online_map = cpumask_of_cpu(0);
#endif
start_kernel();
- return(0);
+ return 0;
}

extern int userspace_pid[];

extern char cpu0_irqstack[];

-int __init start_uml_skas(void)
+int __init start_uml(void)
{
stack_protections((unsigned long) &cpu0_irqstack);
set_sigstack(cpu0_irqstack, THREAD_SIZE);
@@ -176,49 +69,14 @@ int __init start_uml_skas(void)

init_task.thread.request.u.thread.proc = start_kernel_proc;
init_task.thread.request.u.thread.arg = NULL;
- return(start_idle_thread(task_stack_page(&init_task),
- &init_task.thread.mode.skas.switch_buf));
-}
-
-int external_pid_skas(struct task_struct *task)
-{
- /* FIXME: Need to look up userspace_pid by cpu */
- return(userspace_pid[0]);
-}
-
-int thread_pid_skas(struct task_struct *task)
-{
- /* FIXME: Need to look up userspace_pid by cpu */
- return(userspace_pid[0]);
-}
-
-void kill_off_processes_skas(void)
-{
- if(proc_mm)
- /*
- * FIXME: need to loop over userspace_pids in
- * kill_off_processes_skas
- */
- os_kill_ptraced_process(userspace_pid[0], 1);
- else {
- struct task_struct *p;
- int pid, me;
-
- me = os_getpid();
- for_each_process(p){
- if(p->mm == NULL)
- continue;
-
- pid = p->mm->context.skas.id.u.pid;
- os_kill_ptraced_process(pid, 1);
- }
- }
+ return start_idle_thread(task_stack_page(&init_task),
+ &init_task.thread.switch_buf);
}

unsigned long current_stub_stack(void)
{
if(current->mm == NULL)
- return(0);
+ return 0;

- return(current->mm->context.skas.id.stack);
+ return current->mm->context.skas.id.stack;
}
Index: linux-2.6.22/arch/um/kernel/syscall.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/syscall.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/syscall.c 2007-08-13 17:14:24.000000000 -0400
@@ -20,7 +20,6 @@
#include "asm/uaccess.h"
#include "kern_util.h"
#include "sysdep/syscalls.h"
-#include "mode_kern.h"

/* Unlocked, I don't care if this is a bit off */
int nsyscalls = 0;
Index: linux-2.6.22/arch/um/kernel/tlb.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/tlb.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/tlb.c 2007-08-13 17:14:24.000000000 -0400
@@ -8,12 +8,12 @@
#include "asm/pgalloc.h"
#include "asm/pgtable.h"
#include "asm/tlbflush.h"
-#include "mode_kern.h"
#include "as-layout.h"
#include "tlb.h"
#include "mem.h"
#include "mem_user.h"
#include "os.h"
+#include "skas.h"

static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
unsigned int prot, struct host_vm_op *ops, int *index,
@@ -341,6 +341,71 @@ int flush_tlb_kernel_range_common(unsign
return(updated);
}

+void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ struct mm_struct *mm = vma->vm_mm;
+ void *flush = NULL;
+ int r, w, x, prot, err = 0;
+ struct mm_id *mm_id;
+
+ address &= PAGE_MASK;
+ pgd = pgd_offset(mm, address);
+ if(!pgd_present(*pgd))
+ goto kill;
+
+ pud = pud_offset(pgd, address);
+ if(!pud_present(*pud))
+ goto kill;
+
+ pmd = pmd_offset(pud, address);
+ if(!pmd_present(*pmd))
+ goto kill;
+
+ pte = pte_offset_kernel(pmd, address);
+
+ r = pte_read(*pte);
+ w = pte_write(*pte);
+ x = pte_exec(*pte);
+ if (!pte_young(*pte)) {
+ r = 0;
+ w = 0;
+ } else if (!pte_dirty(*pte)) {
+ w = 0;
+ }
+
+ mm_id = &mm->context.skas.id;
+ prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
+ (x ? UM_PROT_EXEC : 0));
+ if(pte_newpage(*pte)){
+ if(pte_present(*pte)){
+ unsigned long long offset;
+ int fd;
+
+ fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
+ err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
+ 1, &flush);
+ }
+ else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
+ }
+ else if(pte_newprot(*pte))
+ err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
+
+ if(err)
+ goto kill;
+
+ *pte = pte_mkuptodate(*pte);
+
+ return;
+
+kill:
+ printk("Failed to flush page for address 0x%lx\n", address);
+ force_sig(SIGKILL, current);
+}
+
pgd_t *pgd_offset_proc(struct mm_struct *mm, unsigned long address)
{
return(pgd_offset(mm, address));
@@ -387,21 +452,80 @@ void flush_tlb_kernel_vm(void)

void __flush_tlb_one(unsigned long addr)
{
- __flush_tlb_one_skas(addr);
+ flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
+}
+
+static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
+ int finished, void **flush)
+{
+ struct host_vm_op *op;
+ int i, ret = 0;
+
+ for(i = 0; i <= last && !ret; i++){
+ op = &ops[i];
+ switch(op->type){
+ case MMAP:
+ ret = map(&mmu->skas.id, op->u.mmap.addr,
+ op->u.mmap.len, op->u.mmap.prot,
+ op->u.mmap.fd, op->u.mmap.offset, finished,
+ flush);
+ break;
+ case MUNMAP:
+ ret = unmap(&mmu->skas.id, op->u.munmap.addr,
+ op->u.munmap.len, finished, flush);
+ break;
+ case MPROTECT:
+ ret = protect(&mmu->skas.id, op->u.mprotect.addr,
+ op->u.mprotect.len, op->u.mprotect.prot,
+ finished, flush);
+ break;
+ default:
+ printk("Unknown op type %d in do_ops\n", op->type);
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static void fix_range(struct mm_struct *mm, unsigned long start_addr,
+ unsigned long end_addr, int force)
+{
+ if(!proc_mm && (end_addr > CONFIG_STUB_START))
+ end_addr = CONFIG_STUB_START;
+
+ fix_range_common(mm, start_addr, end_addr, force, do_ops);
}

void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
- flush_tlb_range_skas(vma, start, end);
+ if(vma->vm_mm == NULL)
+ flush_tlb_kernel_range_common(start, end);
+ else fix_range(vma->vm_mm, start, end, 0);
}

void flush_tlb_mm(struct mm_struct *mm)
{
- flush_tlb_mm_skas(mm);
+ unsigned long end;
+
+ /* Don't bother flushing if this address space is about to be
+ * destroyed.
+ */
+ if(atomic_read(&mm->mm_users) == 0)
+ return;
+
+ end = proc_mm ? task_size : CONFIG_STUB_START;
+ fix_range(mm, 0, end, 0);
}

void force_flush_all(void)
{
- force_flush_all_skas();
+ struct mm_struct *mm = current->mm;
+ struct vm_area_struct *vma = mm->mmap;
+
+ while(vma != NULL) {
+ fix_range(mm, vma->vm_start, vma->vm_end, 1);
+ vma = vma->vm_next;
+ }
}
Index: linux-2.6.22/arch/um/kernel/um_arch.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/um_arch.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/um_arch.c 2007-08-13 17:14:24.000000000 -0400
@@ -35,8 +35,6 @@
#include "initrd.h"
#include "init.h"
#include "os.h"
-#include "mode_kern.h"
-#include "mode.h"
#include "skas.h"

#define DEFAULT_COMMAND_LINE "root=98:0"
@@ -67,7 +65,8 @@ struct cpuinfo_um boot_cpu_data = {

unsigned long thread_saved_pc(struct task_struct *task)
{
- return os_process_pc(thread_pid_skas(task));
+ /* FIXME: Need to look up userspace_pid by cpu */
+ return os_process_pc(userspace_pid[0]);
}

/* Changed in setup_arch, which is called in early boot */
@@ -253,6 +252,19 @@ EXPORT_SYMBOL(end_iomem);

extern char __binary_start;

+static unsigned long set_task_sizes_skas(unsigned long *task_size_out)
+{
+ /* Round up to the nearest 4M */
+ unsigned long host_task_size = ROUND_4M((unsigned long)
+ &host_task_size);
+
+ if (!skas_needs_stub)
+ *task_size_out = host_task_size;
+ else *task_size_out = CONFIG_STUB_START & PGDIR_MASK;
+
+ return host_task_size;
+}
+
int __init linux_main(int argc, char **argv)
{
unsigned long avail, diff;
@@ -289,7 +301,7 @@ int __init linux_main(int argc, char **a
os_fill_handlinfo(handlinfo_kern);

brk_start = (unsigned long) sbrk(0);
- before_mem_skas(brk_start);
+
/* Increase physical memory size for exec-shield users
so they actually get what they asked for. This should
add zero for non-exec shield users */
@@ -354,7 +366,7 @@ int __init linux_main(int argc, char **a
stack_protections((unsigned long) &init_thread_info);
os_flush_stdout();

- return start_uml_skas();
+ return start_uml();
}

extern int uml_exitcode;
Index: linux-2.6.22/arch/um/os-Linux/skas/mem.c
===================================================================
--- linux-2.6.22.orig/arch/um/os-Linux/skas/mem.c 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/os-Linux/skas/mem.c 2007-08-13 17:14:24.000000000 -0400
@@ -294,7 +294,3 @@ int protect(struct mm_id * mm_idp, unsig

return ret;
}
-
-void before_mem_skas(unsigned long unused)
-{
-}
Index: linux-2.6.22/arch/um/sys-i386/ldt.c
===================================================================
--- linux-2.6.22.orig/arch/um/sys-i386/ldt.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/sys-i386/ldt.c 2007-08-13 17:14:24.000000000 -0400
@@ -13,7 +13,6 @@
#include "asm/ldt.h"
#include "asm/unistd.h"
#include "kern.h"
-#include "mode_kern.h"
#include "os.h"

extern int modify_ldt(int func, void *ptr, unsigned long bytecount);
@@ -33,7 +32,7 @@ long write_ldt_entry(struct mm_id * mm_i
* modify isn't current->active_mm.
* If this is called directly by modify_ldt,
* (current->active_mm->context.skas.u == mm_idp)
- * will be true. So no call to switch_mm_skas(mm_idp) is done.
+ * will be true. So no call to __switch_mm(mm_idp) is done.
* If this is called in case of init_new_ldt or PTRACE_LDT,
* mm_idp won't belong to current->active_mm, but child->mm.
* So we need to switch child's mm into our userspace, then
@@ -43,7 +42,7 @@ long write_ldt_entry(struct mm_id * mm_i
*/
if(!current->active_mm || current->active_mm == &init_mm ||
mm_idp != &current->active_mm->context.skas.id)
- switch_mm_skas(mm_idp);
+ __switch_mm(mm_idp);
}

if(ptrace_ldt) {
@@ -88,7 +87,7 @@ long write_ldt_entry(struct mm_id * mm_i
*/
if(current->active_mm && current->active_mm != &init_mm &&
mm_idp != &current->active_mm->context.skas.id)
- switch_mm_skas(&current->active_mm->context.skas.id);
+ __switch_mm(&current->active_mm->context.skas.id);
}

return res;
Index: linux-2.6.22/arch/um/sys-i386/tls.c
===================================================================
--- linux-2.6.22.orig/arch/um/sys-i386/tls.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/sys-i386/tls.c 2007-08-13 17:14:24.000000000 -0400
@@ -14,9 +14,7 @@
#include "asm/desc.h"
#include "kern.h"
#include "kern_util.h"
-#include "mode_kern.h"
#include "os.h"
-#include "mode.h"
#include "skas.h"

/*
@@ -167,7 +165,7 @@ void clear_flushed_tls(struct task_struc
* And this will not need be used when (and if) we'll add support to the host
* SKAS patch. */

-int arch_switch_tls_skas(struct task_struct *from, struct task_struct *to)
+int arch_switch_tls(struct task_struct *from, struct task_struct *to)
{
if (!host_supports_tls)
return 0;
Index: linux-2.6.22/include/asm-um/processor-generic.h
===================================================================
--- linux-2.6.22.orig/include/asm-um/processor-generic.h 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/include/asm-um/processor-generic.h 2007-08-13 17:14:24.000000000 -0400
@@ -32,12 +32,8 @@ struct thread_struct {
unsigned long temp_stack;
void *exec_buf;
struct arch_thread arch;
- union {
- struct {
- jmp_buf switch_buf;
- int mm_count;
- } skas;
- } mode;
+ jmp_buf switch_buf;
+ int mm_count;
struct {
int op;
union {
@@ -75,7 +71,10 @@ typedef struct {

extern struct task_struct *alloc_task_struct(void);

-extern void release_thread(struct task_struct *);
+static inline void release_thread(struct task_struct *task)
+{
+}
+
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);

static inline void prepare_to_copy(struct task_struct *tsk)
@@ -125,8 +124,7 @@ extern struct cpuinfo_um cpu_data[];
#endif


-#define KSTK_REG(tsk, reg) \
- get_thread_reg(reg, &tsk->thread.mode.skas.switch_buf)
+#define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
#define get_wchan(p) (0)

#endif
Index: linux-2.6.22/arch/um/drivers/harddog_user.c
===================================================================
--- linux-2.6.22.orig/arch/um/drivers/harddog_user.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/drivers/harddog_user.c 2007-08-13 17:14:23.000000000 -0400
@@ -9,7 +9,6 @@
#include "user.h"
#include "mconsole.h"
#include "os.h"
-#include "mode.h"

struct dog_data {
int stdin;
Index: linux-2.6.22/arch/um/kernel/signal.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/signal.c 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/signal.c 2007-08-13 17:14:24.000000000 -0400
@@ -23,7 +23,6 @@
#include "kern.h"
#include "frame_kern.h"
#include "sigcontext.h"
-#include "mode.h"

EXPORT_SYMBOL(block_signals);
EXPORT_SYMBOL(unblock_signals);
Index: linux-2.6.22/arch/um/kernel/time.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/time.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/time.c 2007-08-13 17:14:24.000000000 -0400
@@ -18,7 +18,6 @@
#include "asm/param.h"
#include "asm/current.h"
#include "kern_util.h"
-#include "mode.h"
#include "os.h"

int hz(void)
@@ -39,7 +38,7 @@ static unsigned long long prev_nsecs[NR_
static long long delta[NR_CPUS]; /* Deviation per interval */
#endif

-void timer_irq(union uml_pt_regs *regs)
+void timer_irq(struct uml_pt_regs *regs)
{
unsigned long long ticks = 0;
#ifdef CONFIG_UML_REAL_TIME_CLOCK
@@ -175,13 +174,13 @@ int do_settimeofday(struct timespec *tv)
return 0;
}

-void timer_handler(int sig, union uml_pt_regs *regs)
+void timer_handler(int sig, struct uml_pt_regs *regs)
{
if(current_thread->cpu == 0)
timer_irq(regs);
local_irq_disable();
irq_enter();
- update_process_times((regs)->skas.is_user);
+ update_process_times(regs->is_user);
irq_exit();
local_irq_enable();
}
Index: linux-2.6.22/arch/um/os-Linux/aio.c
===================================================================
--- linux-2.6.22.orig/arch/um/os-Linux/aio.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/os-Linux/aio.c 2007-08-13 17:14:24.000000000 -0400
@@ -13,7 +13,6 @@
#include "aio.h"
#include "init.h"
#include "user.h"
-#include "mode.h"
#include "kern_constants.h"

struct aio_thread_req {
Index: linux-2.6.22/arch/um/os-Linux/main.c
===================================================================
--- linux-2.6.22.orig/arch/um/os-Linux/main.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/os-Linux/main.c 2007-08-13 17:14:24.000000000 -0400
@@ -18,7 +18,6 @@
#include "irq_user.h"
#include "user.h"
#include "init.h"
-#include "mode.h"
#include "uml-config.h"
#include "os.h"
#include "um_malloc.h"
Index: linux-2.6.22/arch/um/os-Linux/signal.c
===================================================================
--- linux-2.6.22.orig/arch/um/os-Linux/signal.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/os-Linux/signal.c 2007-08-13 17:14:24.000000000 -0400
@@ -16,7 +16,6 @@
#include "sysdep/sigcontext.h"
#include "sysdep/barrier.h"
#include "sigcontext.h"
-#include "mode.h"
#include "os.h"

/* These are the asynchronous signals. SIGVTALRM and SIGARLM are handled
@@ -60,14 +59,14 @@ void sig_handler(int sig, struct sigcont

static void real_alarm_handler(int sig, struct sigcontext *sc)
{
- union uml_pt_regs regs;
+ struct uml_pt_regs regs;

if(sig == SIGALRM)
switch_timers(0);

if(sc != NULL)
copy_sc(&regs, sc);
- regs.skas.is_user = 0;
+ regs.is_user = 0;
unblock_signals();
timer_handler(sig, &regs);

Index: linux-2.6.22/arch/um/include/kern_util.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/kern_util.h 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/include/kern_util.h 2007-08-13 17:14:24.000000000 -0400
@@ -10,7 +10,7 @@
#include "sysdep/faultinfo.h"
#include "uml-config.h"

-typedef void (*kern_hndl)(int, union uml_pt_regs *);
+typedef void (*kern_hndl)(int, struct uml_pt_regs *);

struct kern_handlers {
kern_hndl relay_signal;
@@ -41,7 +41,7 @@ extern unsigned long alloc_stack(int ord
extern int do_signal(void);
extern int is_stack_fault(unsigned long sp);
extern unsigned long segv(struct faultinfo fi, unsigned long ip,
- int is_user, union uml_pt_regs *regs);
+ int is_user, struct uml_pt_regs *regs);
extern int handle_page_fault(unsigned long address, unsigned long ip,
int is_write, int is_user, int *code_out);
extern void syscall_ready(void);
@@ -54,7 +54,7 @@ extern int need_finish_fork(void);
extern void free_stack(unsigned long stack, int order);
extern void add_input_request(int op, void (*proc)(int), void *arg);
extern char *current_cmd(void);
-extern void timer_handler(int sig, union uml_pt_regs *regs);
+extern void timer_handler(int sig, struct uml_pt_regs *regs);
extern int set_signals(int enable);
extern int pid_to_processor_id(int pid);
extern void deliver_signals(void *t);
@@ -64,9 +64,9 @@ extern void finish_fork(void);
extern void paging_init(void);
extern void init_flush_vm(void);
extern void *syscall_sp(void *t);
-extern void syscall_trace(union uml_pt_regs *regs, int entryexit);
+extern void syscall_trace(struct uml_pt_regs *regs, int entryexit);
extern int hz(void);
-extern unsigned int do_IRQ(int irq, union uml_pt_regs *regs);
+extern unsigned int do_IRQ(int irq, struct uml_pt_regs *regs);
extern void interrupt_end(void);
extern void initial_thread_cb(void (*proc)(void *), void *arg);
extern int debugger_signal(int status, int pid);
@@ -76,9 +76,9 @@ extern int init_ptrace_proxy(int idle_pi
extern int init_parent_proxy(int pid);
extern int singlestepping(void *t);
extern void check_stack_overflow(void *ptr);
-extern void relay_signal(int sig, union uml_pt_regs *regs);
+extern void relay_signal(int sig, struct uml_pt_regs *regs);
extern int user_context(unsigned long sp);
-extern void timer_irq(union uml_pt_regs *regs);
+extern void timer_irq(struct uml_pt_regs *regs);
extern void do_uml_exitcalls(void);
extern int attach_debugger(int idle_pid, int pid, int stop);
extern int config_gdb(char *str);
@@ -109,11 +109,12 @@ extern void time_init_kern(void);

/* Are we disallowed to sleep? Used to choose between GFP_KERNEL and GFP_ATOMIC. */
extern int __cant_sleep(void);
-extern void sigio_handler(int sig, union uml_pt_regs *regs);
+extern void sigio_handler(int sig, struct uml_pt_regs *regs);

-extern void copy_sc(union uml_pt_regs *regs, void *from);
+extern void copy_sc(struct uml_pt_regs *regs, void *from);

unsigned long to_irq_stack(int sig, unsigned long *mask_out);
unsigned long from_irq_stack(int nested);

+extern int start_uml(void);
#endif
Index: linux-2.6.22/arch/um/os-Linux/trap.c
===================================================================
--- linux-2.6.22.orig/arch/um/os-Linux/trap.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/os-Linux/trap.c 2007-08-13 17:14:24.000000000 -0400
@@ -7,15 +7,10 @@
#include <signal.h>
#include "kern_util.h"
#include "os.h"
-#include "mode.h"
#include "longjmp.h"

-void usr2_handler(int sig, union uml_pt_regs *regs)
-{
-}
-
/* Initialized from linux_main() */
-void (*sig_info[NSIG])(int, union uml_pt_regs *);
+void (*sig_info[NSIG])(int, struct uml_pt_regs *);

void os_fill_handlinfo(struct kern_handlers h)
{
@@ -28,7 +23,6 @@ void os_fill_handlinfo(struct kern_handl
sig_info[SIGIO] = h.sigio_handler;
sig_info[SIGVTALRM] = h.timer_handler;
sig_info[SIGALRM] = h.timer_handler;
- sig_info[SIGUSR2] = usr2_handler;
}

void do_longjmp(void *b, int val)
Index: linux-2.6.22/arch/um/os-Linux/start_up.c
===================================================================
--- linux-2.6.22.orig/arch/um/os-Linux/start_up.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/os-Linux/start_up.c 2007-08-13 17:14:24.000000000 -0400
@@ -31,7 +31,6 @@
#include "init.h"
#include "os.h"
#include "uml-config.h"
-#include "mode.h"
#include "tempfile.h"
#include "kern_constants.h"
#include "skas.h"
Index: linux-2.6.22/arch/um/kernel/skas/Makefile
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/skas/Makefile 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/skas/Makefile 2007-08-13 17:14:24.000000000 -0400
@@ -3,7 +3,7 @@
# Licensed under the GPL
#

-obj-y := clone.o exec.o mem.o mmu.o process.o syscall.o tlb.o uaccess.o
+obj-y := clone.o mmu.o process.o syscall.o uaccess.o

# clone.o is in the stub, so it can't be built with profiling
# GCC hardened also auto-enables -fpic, but we need %ebx so it can't work ->
Index: linux-2.6.22/arch/um/os-Linux/umid.c
===================================================================
--- linux-2.6.22.orig/arch/um/os-Linux/umid.c 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/os-Linux/umid.c 2007-08-13 17:14:24.000000000 -0400
@@ -11,7 +11,6 @@
#include "init.h"
#include "os.h"
#include "user.h"
-#include "mode.h"

#define UML_DIR "~/.uml/"

Index: linux-2.6.22/arch/um/sys-i386/ptrace.c
===================================================================
--- linux-2.6.22.orig/arch/um/sys-i386/ptrace.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/sys-i386/ptrace.c 2007-08-13 17:14:24.000000000 -0400
@@ -14,16 +14,18 @@
#include "sysdep/sigcontext.h"
#include "sysdep/sc.h"

-void arch_switch_to_skas(struct task_struct *from, struct task_struct *to)
+extern int arch_switch_tls(struct task_struct *from, struct task_struct *to);
+
+void arch_switch_to(struct task_struct *from, struct task_struct *to)
{
- int err = arch_switch_tls_skas(from, to);
+ int err = arch_switch_tls(from, to);
if (!err)
return;

if (err != -EINVAL)
- printk(KERN_WARNING "arch_switch_tls_skas failed, errno %d, not EINVAL\n", -err);
+ printk(KERN_WARNING "arch_switch_tls failed, errno %d, not EINVAL\n", -err);
else
- printk(KERN_WARNING "arch_switch_tls_skas failed, errno = EINVAL\n");
+ printk(KERN_WARNING "arch_switch_tls failed, errno = EINVAL\n");
}

int is_syscall(unsigned long addr)
Index: linux-2.6.22/arch/um/sys-x86_64/syscalls.c
===================================================================
--- linux-2.6.22.orig/arch/um/sys-x86_64/syscalls.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/sys-x86_64/syscalls.c 2007-08-13 17:14:24.000000000 -0400
@@ -28,8 +28,7 @@ asmlinkage long sys_uname64(struct new_u
return err ? -EFAULT : 0;
}

-long arch_prctl_skas(struct task_struct *task, int code,
- unsigned long __user *addr)
+long arch_prctl(struct task_struct *task, int code, unsigned long __user *addr)
{
unsigned long *ptr = addr, tmp;
long ret;
@@ -91,7 +90,7 @@ long arch_prctl_skas(struct task_struct

long sys_arch_prctl(int code, unsigned long addr)
{
- return arch_prctl_skas(current, code, (unsigned long __user *) addr);
+ return arch_prctl(current, code, (unsigned long __user *) addr);
}

long sys_clone(unsigned long clone_flags, unsigned long newsp,
@@ -108,10 +107,10 @@ long sys_clone(unsigned long clone_flags
return ret;
}

-void arch_switch_to_skas(struct task_struct *from, struct task_struct *to)
+void arch_switch_to(struct task_struct *from, struct task_struct *to)
{
if((to->thread.arch.fs == 0) || (to->mm == NULL))
return;

- arch_prctl_skas(to, ARCH_SET_FS, (void __user *) to->thread.arch.fs);
+ arch_prctl(to, ARCH_SET_FS, (void __user *) to->thread.arch.fs);
}
Index: linux-2.6.22/arch/um/kernel/ptrace.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/ptrace.c 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/ptrace.c 2007-08-13 17:14:24.000000000 -0400
@@ -228,7 +228,7 @@ long arch_ptrace(struct task_struct *chi
#ifdef PTRACE_ARCH_PRCTL
case PTRACE_ARCH_PRCTL:
/* XXX Calls ptrace on the host - needs some SMP thinking */
- ret = arch_prctl_skas(child, data, (void *) addr);
+ ret = arch_prctl(child, data, (void *) addr);
break;
#endif
default:
@@ -239,7 +239,7 @@ long arch_ptrace(struct task_struct *chi
return ret;
}

-void send_sigtrap(struct task_struct *tsk, union uml_pt_regs *regs,
+void send_sigtrap(struct task_struct *tsk, struct uml_pt_regs *regs,
int error_code)
{
struct siginfo info;
@@ -258,7 +258,7 @@ void send_sigtrap(struct task_struct *ts
/* XXX Check PT_DTRACE vs TIF_SINGLESTEP for singlestepping check and
* PT_PTRACED vs TIF_SYSCALL_TRACE for syscall tracing check
*/
-void syscall_trace(union uml_pt_regs *regs, int entryexit)
+void syscall_trace(struct uml_pt_regs *regs, int entryexit)
{
int is_singlestep = (current->ptrace & PT_DTRACE) && entryexit;
int tracesysgood;
Index: linux-2.6.22/arch/um/os-Linux/process.c
===================================================================
--- linux-2.6.22.orig/arch/um/os-Linux/process.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/os-Linux/process.c 2007-08-13 17:14:24.000000000 -0400
@@ -244,9 +244,6 @@ void init_new_thread_signals(void)
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
set_handler(SIGBUS, (__sighandler_t) sig_handler, SA_ONSTACK,
SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
- set_handler(SIGUSR2, (__sighandler_t) sig_handler,
- SA_ONSTACK, SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM,
- -1);
signal(SIGHUP, SIG_IGN);

init_irq_signals(1);
Index: linux-2.6.22/arch/um/include/sysdep-i386/ptrace.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/sysdep-i386/ptrace.h 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/include/sysdep-i386/ptrace.h 2007-08-13 17:14:24.000000000 -0400
@@ -52,37 +52,34 @@ extern int sysemu_supported;
#define PTRACE_SYSEMU_SINGLESTEP 32
#endif

-union uml_pt_regs {
- struct skas_regs {
- unsigned long regs[MAX_REG_NR];
- unsigned long fp[HOST_FP_SIZE];
- unsigned long xfp[HOST_XFP_SIZE];
- struct faultinfo faultinfo;
- long syscall;
- int is_user;
- } skas;
+struct uml_pt_regs {
+ unsigned long regs[MAX_REG_NR];
+ unsigned long fp[HOST_FP_SIZE];
+ unsigned long xfp[HOST_XFP_SIZE];
+ struct faultinfo faultinfo;
+ long syscall;
+ int is_user;
};

#define EMPTY_UML_PT_REGS { }

-#define UPT_SC(r) ((r)->tt.sc)
-#define UPT_IP(r) REGS_IP((r)->skas.regs)
-#define UPT_SP(r) REGS_SP((r)->skas.regs)
-#define UPT_EFLAGS(r) REGS_EFLAGS((r)->skas.regs)
-#define UPT_EAX(r) REGS_EAX((r)->skas.regs)
-#define UPT_EBX(r) REGS_EBX((r)->skas.regs)
-#define UPT_ECX(r) REGS_ECX((r)->skas.regs)
-#define UPT_EDX(r) REGS_EDX((r)->skas.regs)
-#define UPT_ESI(r) REGS_ESI((r)->skas.regs)
-#define UPT_EDI(r) REGS_EDI((r)->skas.regs)
-#define UPT_EBP(r) REGS_EBP((r)->skas.regs)
-#define UPT_ORIG_EAX(r) ((r)->skas.syscall)
-#define UPT_CS(r) REGS_CS((r)->skas.regs)
-#define UPT_SS(r) REGS_SS((r)->skas.regs)
-#define UPT_DS(r) REGS_DS((r)->skas.regs)
-#define UPT_ES(r) REGS_ES((r)->skas.regs)
-#define UPT_FS(r) REGS_FS((r)->skas.regs)
-#define UPT_GS(r) REGS_GS((r)->skas.regs)
+#define UPT_IP(r) REGS_IP((r)->regs)
+#define UPT_SP(r) REGS_SP((r)->regs)
+#define UPT_EFLAGS(r) REGS_EFLAGS((r)->regs)
+#define UPT_EAX(r) REGS_EAX((r)->regs)
+#define UPT_EBX(r) REGS_EBX((r)->regs)
+#define UPT_ECX(r) REGS_ECX((r)->regs)
+#define UPT_EDX(r) REGS_EDX((r)->regs)
+#define UPT_ESI(r) REGS_ESI((r)->regs)
+#define UPT_EDI(r) REGS_EDI((r)->regs)
+#define UPT_EBP(r) REGS_EBP((r)->regs)
+#define UPT_ORIG_EAX(r) ((r)->syscall)
+#define UPT_CS(r) REGS_CS((r)->regs)
+#define UPT_SS(r) REGS_SS((r)->regs)
+#define UPT_DS(r) REGS_DS((r)->regs)
+#define UPT_ES(r) REGS_ES((r)->regs)
+#define UPT_FS(r) REGS_FS((r)->regs)
+#define UPT_GS(r) REGS_GS((r)->regs)

#define UPT_SYSCALL_ARG1(r) UPT_EBX(r)
#define UPT_SYSCALL_ARG2(r) UPT_ECX(r)
@@ -93,7 +90,7 @@ union uml_pt_regs {

extern int user_context(unsigned long sp);

-#define UPT_IS_USER(r) ((r)->skas.is_user)
+#define UPT_IS_USER(r) ((r)->is_user)

struct syscall_args {
unsigned long args[6];
@@ -162,14 +159,14 @@ struct syscall_args {
} while (0)

#define UPT_SET_SYSCALL_RETURN(r, res) \
- REGS_SET_SYSCALL_RETURN((r)->skas.regs, (res))
+ REGS_SET_SYSCALL_RETURN((r)->regs, (res))

-#define UPT_RESTART_SYSCALL(r) REGS_RESTART_SYSCALL((r)->skas.regs)
+#define UPT_RESTART_SYSCALL(r) REGS_RESTART_SYSCALL((r)->regs)

#define UPT_ORIG_SYSCALL(r) UPT_EAX(r)
#define UPT_SYSCALL_NR(r) UPT_ORIG_EAX(r)
#define UPT_SYSCALL_RET(r) UPT_EAX(r)

-#define UPT_FAULTINFO(r) (&(r)->skas.faultinfo)
+#define UPT_FAULTINFO(r) (&(r)->faultinfo)

#endif
Index: linux-2.6.22/arch/um/include/sysdep-x86_64/ptrace.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/sysdep-x86_64/ptrace.h 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/include/sysdep-x86_64/ptrace.h 2007-08-13 17:14:23.000000000 -0400
@@ -84,58 +84,52 @@

#define REGS_ERR(r) ((r)->fault_type)

-/* XXX */
-union uml_pt_regs {
- struct skas_regs {
- unsigned long regs[MAX_REG_NR];
- unsigned long fp[HOST_FP_SIZE];
- struct faultinfo faultinfo;
- long syscall;
- int is_user;
- } skas;
+struct uml_pt_regs {
+ unsigned long regs[MAX_REG_NR];
+ unsigned long fp[HOST_FP_SIZE];
+ struct faultinfo faultinfo;
+ long syscall;
+ int is_user;
};

#define EMPTY_UML_PT_REGS { }

-#define UPT_RBX(r) REGS_RBX((r)->skas.regs)
-#define UPT_RCX(r) REGS_RCX((r)->skas.regs)
-#define UPT_RDX(r) REGS_RDX((r)->skas.regs)
-#define UPT_RSI(r) REGS_RSI((r)->skas.regs)
-#define UPT_RDI(r) REGS_RDI((r)->skas.regs)
-#define UPT_RBP(r) REGS_RBP((r)->skas.regs)
-#define UPT_RAX(r) REGS_RAX((r)->skas.regs)
-#define UPT_R8(r) REGS_R8((r)->skas.regs)
-#define UPT_R9(r) REGS_R9((r)->skas.regs)
-#define UPT_R10(r) REGS_R10((r)->skas.regs)
-#define UPT_R11(r) REGS_R11((r)->skas.regs)
-#define UPT_R12(r) REGS_R12((r)->skas.regs)
-#define UPT_R13(r) REGS_R13((r)->skas.regs)
-#define UPT_R14(r) REGS_R14((r)->skas.regs)
-#define UPT_R15(r) REGS_R15((r)->skas.regs)
-#define UPT_CS(r) REGS_CS((r)->skas.regs)
-#define UPT_FS_BASE(r) \
- REGS_FS_BASE((r)->skas.regs)
-#define UPT_FS(r) REGS_FS((r)->skas.regs)
-#define UPT_GS_BASE(r) \
- REGS_GS_BASE((r)->skas.regs)
-#define UPT_GS(r) REGS_GS((r)->skas.regs)
-#define UPT_DS(r) REGS_DS((r)->skas.regs)
-#define UPT_ES(r) REGS_ES((r)->skas.regs)
-#define UPT_CS(r) REGS_CS((r)->skas.regs)
-#define UPT_SS(r) REGS_SS((r)->skas.regs)
-#define UPT_ORIG_RAX(r) REGS_ORIG_RAX((r)->skas.regs)
-
-#define UPT_IP(r) REGS_IP((r)->skas.regs)
-#define UPT_SP(r) REGS_SP((r)->skas.regs)
-
-#define UPT_EFLAGS(r) REGS_EFLAGS((r)->skas.regs)
-#define UPT_SC(r) ((r)->tt.sc)
-#define UPT_SYSCALL_NR(r) ((r)->skas.syscall)
+#define UPT_RBX(r) REGS_RBX((r)->regs)
+#define UPT_RCX(r) REGS_RCX((r)->regs)
+#define UPT_RDX(r) REGS_RDX((r)->regs)
+#define UPT_RSI(r) REGS_RSI((r)->regs)
+#define UPT_RDI(r) REGS_RDI((r)->regs)
+#define UPT_RBP(r) REGS_RBP((r)->regs)
+#define UPT_RAX(r) REGS_RAX((r)->regs)
+#define UPT_R8(r) REGS_R8((r)->regs)
+#define UPT_R9(r) REGS_R9((r)->regs)
+#define UPT_R10(r) REGS_R10((r)->regs)
+#define UPT_R11(r) REGS_R11((r)->regs)
+#define UPT_R12(r) REGS_R12((r)->regs)
+#define UPT_R13(r) REGS_R13((r)->regs)
+#define UPT_R14(r) REGS_R14((r)->regs)
+#define UPT_R15(r) REGS_R15((r)->regs)
+#define UPT_CS(r) REGS_CS((r)->regs)
+#define UPT_FS_BASE(r) REGS_FS_BASE((r)->regs)
+#define UPT_FS(r) REGS_FS((r)->regs)
+#define UPT_GS_BASE(r) REGS_GS_BASE((r)->regs)
+#define UPT_GS(r) REGS_GS((r)->regs)
+#define UPT_DS(r) REGS_DS((r)->regs)
+#define UPT_ES(r) REGS_ES((r)->regs)
+#define UPT_CS(r) REGS_CS((r)->regs)
+#define UPT_SS(r) REGS_SS((r)->regs)
+#define UPT_ORIG_RAX(r) REGS_ORIG_RAX((r)->regs)
+
+#define UPT_IP(r) REGS_IP((r)->regs)
+#define UPT_SP(r) REGS_SP((r)->regs)
+
+#define UPT_EFLAGS(r) REGS_EFLAGS((r)->regs)
+#define UPT_SYSCALL_NR(r) ((r)->syscall)
#define UPT_SYSCALL_RET(r) UPT_RAX(r)

extern int user_context(unsigned long sp);

-#define UPT_IS_USER(r) ((r)->skas.is_user)
+#define UPT_IS_USER(r) ((r)->is_user)

#define UPT_SYSCALL_ARG1(r) UPT_RDI(r)
#define UPT_SYSCALL_ARG2(r) UPT_RSI(r)
@@ -232,12 +226,12 @@ struct syscall_args {
})

#define UPT_SET_SYSCALL_RETURN(r, res) \
- REGS_SET_SYSCALL_RETURN((r)->skas.regs, (res))
+ REGS_SET_SYSCALL_RETURN((r)->regs, (res))

-#define UPT_RESTART_SYSCALL(r) REGS_RESTART_SYSCALL((r)->skas.regs)
+#define UPT_RESTART_SYSCALL(r) REGS_RESTART_SYSCALL((r)->regs)

#define UPT_SEGV_IS_FIXABLE(r) REGS_SEGV_IS_FIXABLE(&r->skas)

-#define UPT_FAULTINFO(r) (&(r)->skas.faultinfo)
+#define UPT_FAULTINFO(r) (&(r)->faultinfo)

#endif
Index: linux-2.6.22/arch/um/kernel/skas/syscall.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/skas/syscall.c 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/skas/syscall.c 2007-08-13 17:14:24.000000000 -0400
@@ -13,7 +13,7 @@
#include "kern_util.h"
#include "syscall.h"

-void handle_syscall(union uml_pt_regs *r)
+void handle_syscall(struct uml_pt_regs *r)
{
struct pt_regs *regs = container_of(r, struct pt_regs, regs);
long result;
@@ -37,7 +37,7 @@ void handle_syscall(union uml_pt_regs *r
result = -ENOSYS;
else result = EXECUTE_SYSCALL(syscall, regs);

- REGS_SET_SYSCALL_RETURN(r->skas.regs, result);
+ REGS_SET_SYSCALL_RETURN(r->regs, result);

syscall_trace(r, 1);
}
Index: linux-2.6.22/arch/um/os-Linux/registers.c
===================================================================
--- linux-2.6.22.orig/arch/um/os-Linux/registers.c 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/os-Linux/registers.c 2007-08-13 17:14:24.000000000 -0400
@@ -13,26 +13,26 @@

static unsigned long exec_regs[MAX_REG_NR];

-void init_thread_registers(union uml_pt_regs *to)
+void init_thread_registers(struct uml_pt_regs *to)
{
- memcpy(to->skas.regs, exec_regs, sizeof(to->skas.regs));
+ memcpy(to->regs, exec_regs, sizeof(to->regs));
}

-void save_registers(int pid, union uml_pt_regs *regs)
+void save_registers(int pid, struct uml_pt_regs *regs)
{
int err;

- err = ptrace(PTRACE_GETREGS, pid, 0, regs->skas.regs);
+ err = ptrace(PTRACE_GETREGS, pid, 0, regs->regs);
if(err < 0)
panic("save_registers - saving registers failed, errno = %d\n",
errno);
}

-void restore_registers(int pid, union uml_pt_regs *regs)
+void restore_registers(int pid, struct uml_pt_regs *regs)
{
int err;

- err = ptrace(PTRACE_SETREGS, pid, 0, regs->skas.regs);
+ err = ptrace(PTRACE_SETREGS, pid, 0, regs->regs);
if(err < 0)
panic("restore_registers - saving registers failed, "
"errno = %d\n", errno);
Index: linux-2.6.22/arch/um/os-Linux/skas/process.c
===================================================================
--- linux-2.6.22.orig/arch/um/os-Linux/skas/process.c 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/os-Linux/skas/process.c 2007-08-13 17:14:24.000000000 -0400
@@ -131,19 +131,19 @@ void get_skas_faultinfo(int pid, struct
}
}

-static void handle_segv(int pid, union uml_pt_regs * regs)
+static void handle_segv(int pid, struct uml_pt_regs * regs)
{
- get_skas_faultinfo(pid, &regs->skas.faultinfo);
- segv(regs->skas.faultinfo, 0, 1, NULL);
+ get_skas_faultinfo(pid, &regs->faultinfo);
+ segv(regs->faultinfo, 0, 1, NULL);
}

/*To use the same value of using_sysemu as the caller, ask it that value (in local_using_sysemu)*/
-static void handle_trap(int pid, union uml_pt_regs *regs, int local_using_sysemu)
+static void handle_trap(int pid, struct uml_pt_regs *regs, int local_using_sysemu)
{
int err, status;

/* Mark this as a syscall */
- UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->skas.regs);
+ UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->regs);

if (!local_using_sysemu)
{
@@ -286,7 +286,7 @@ int start_userspace(unsigned long stub_s
return(pid);
}

-void userspace(union uml_pt_regs *regs)
+void userspace(struct uml_pt_regs *regs)
{
int err, status, op, pid = userspace_pid[0];
/* To prevent races if using_sysemu changes under us.*/
@@ -312,7 +312,7 @@ void userspace(union uml_pt_regs *regs)
panic("userspace - waitpid failed, errno = %d\n",
errno);

- regs->skas.is_user = 1;
+ regs->is_user = 1;
save_registers(pid, regs);
UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */

@@ -321,7 +321,7 @@ void userspace(union uml_pt_regs *regs)
switch(sig){
case SIGSEGV:
if(PTRACE_FULL_FAULTINFO || !ptrace_faultinfo){
- get_skas_faultinfo(pid, &regs->skas.faultinfo);
+ get_skas_faultinfo(pid, &regs->faultinfo);
(*sig_info[SIGSEGV])(SIGSEGV, regs);
}
else handle_segv(pid, regs);
@@ -351,7 +351,7 @@ void userspace(union uml_pt_regs *regs)

/* Avoid -ERESTARTSYS handling in host */
if(PT_SYSCALL_NR_OFFSET != PT_SYSCALL_RET_OFFSET)
- PT_SYSCALL_NR(regs->skas.regs) = -1;
+ PT_SYSCALL_NR(regs->regs) = -1;
}
}
}
@@ -578,16 +578,16 @@ void reboot_skas(void)
UML_LONGJMP(&initial_jmpbuf, INIT_JMP_REBOOT);
}

-void switch_mm_skas(struct mm_id *mm_idp)
+void __switch_mm(struct mm_id *mm_idp)
{
int err;

- /* FIXME: need cpu pid in switch_mm_skas */
+ /* FIXME: need cpu pid in __switch_mm */
if(proc_mm){
err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0,
mm_idp->u.mm_fd);
if(err)
- panic("switch_mm_skas - PTRACE_SWITCH_MM failed, "
+ panic("__switch_mm - PTRACE_SWITCH_MM failed, "
"errno = %d\n", errno);
}
else userspace_pid[0] = mm_idp->u.pid;
Index: linux-2.6.22/arch/um/os-Linux/skas/trap.c
===================================================================
--- linux-2.6.22.orig/arch/um/os-Linux/skas/trap.c 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/os-Linux/skas/trap.c 2007-08-13 17:14:24.000000000 -0400
@@ -15,13 +15,13 @@
#include "sysdep/ptrace_user.h"
#include "os.h"

-static union uml_pt_regs ksig_regs[UM_NR_CPUS];
+static struct uml_pt_regs ksig_regs[UM_NR_CPUS];

void sig_handler_common_skas(int sig, void *sc_ptr)
{
struct sigcontext *sc = sc_ptr;
- union uml_pt_regs *r;
- void (*handler)(int, union uml_pt_regs *);
+ struct uml_pt_regs *r;
+ void (*handler)(int, struct uml_pt_regs *);
int save_user, save_errno = errno;

/* This is done because to allow SIGSEGV to be delivered inside a SEGV
@@ -42,12 +42,12 @@ void sig_handler_common_skas(int sig, vo
}
else r = TASK_REGS(get_current());

- save_user = r->skas.is_user;
- r->skas.is_user = 0;
+ save_user = r->is_user;
+ r->is_user = 0;
if ( sig == SIGFPE || sig == SIGSEGV ||
sig == SIGBUS || sig == SIGILL ||
sig == SIGTRAP ) {
- GET_FAULTINFO_FROM_SC(r->skas.faultinfo, sc);
+ GET_FAULTINFO_FROM_SC(r->faultinfo, sc);
}

change_sig(SIGUSR1, 1);
@@ -62,5 +62,5 @@ void sig_handler_common_skas(int sig, vo
handler(sig, r);

errno = save_errno;
- r->skas.is_user = save_user;
+ r->is_user = save_user;
}
Index: linux-2.6.22/arch/um/sys-i386/signal.c
===================================================================
--- linux-2.6.22.orig/arch/um/sys-i386/signal.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/sys-i386/signal.c 2007-08-13 17:14:24.000000000 -0400
@@ -14,30 +14,30 @@
#include "registers.h"
#include "skas.h"

-void copy_sc(union uml_pt_regs *regs, void *from)
+void copy_sc(struct uml_pt_regs *regs, void *from)
{
struct sigcontext *sc = from;

- REGS_GS(regs->skas.regs) = sc->gs;
- REGS_FS(regs->skas.regs) = sc->fs;
- REGS_ES(regs->skas.regs) = sc->es;
- REGS_DS(regs->skas.regs) = sc->ds;
- REGS_EDI(regs->skas.regs) = sc->edi;
- REGS_ESI(regs->skas.regs) = sc->esi;
- REGS_EBP(regs->skas.regs) = sc->ebp;
- REGS_SP(regs->skas.regs) = sc->esp;
- REGS_EBX(regs->skas.regs) = sc->ebx;
- REGS_EDX(regs->skas.regs) = sc->edx;
- REGS_ECX(regs->skas.regs) = sc->ecx;
- REGS_EAX(regs->skas.regs) = sc->eax;
- REGS_IP(regs->skas.regs) = sc->eip;
- REGS_CS(regs->skas.regs) = sc->cs;
- REGS_EFLAGS(regs->skas.regs) = sc->eflags;
- REGS_SS(regs->skas.regs) = sc->ss;
+ REGS_GS(regs->regs) = sc->gs;
+ REGS_FS(regs->regs) = sc->fs;
+ REGS_ES(regs->regs) = sc->es;
+ REGS_DS(regs->regs) = sc->ds;
+ REGS_EDI(regs->regs) = sc->edi;
+ REGS_ESI(regs->regs) = sc->esi;
+ REGS_EBP(regs->regs) = sc->ebp;
+ REGS_SP(regs->regs) = sc->esp;
+ REGS_EBX(regs->regs) = sc->ebx;
+ REGS_EDX(regs->regs) = sc->edx;
+ REGS_ECX(regs->regs) = sc->ecx;
+ REGS_EAX(regs->regs) = sc->eax;
+ REGS_IP(regs->regs) = sc->eip;
+ REGS_CS(regs->regs) = sc->cs;
+ REGS_EFLAGS(regs->regs) = sc->eflags;
+ REGS_SS(regs->regs) = sc->ss;
}

-static int copy_sc_from_user_skas(struct pt_regs *regs,
- struct sigcontext __user *from)
+static int copy_sc_from_user(struct pt_regs *regs,
+ struct sigcontext __user *from)
{
struct sigcontext sc;
unsigned long fpregs[HOST_FP_SIZE];
@@ -60,31 +60,32 @@ static int copy_sc_from_user_skas(struct
return 0;
}

-int copy_sc_to_user_skas(struct sigcontext __user *to, struct _fpstate __user *to_fp,
- struct pt_regs *regs, unsigned long sp)
+static int copy_sc_to_user(struct sigcontext __user *to,
+ struct _fpstate __user *to_fp, struct pt_regs *regs,
+ unsigned long sp)
{
struct sigcontext sc;
unsigned long fpregs[HOST_FP_SIZE];
struct faultinfo * fi = &current->thread.arch.faultinfo;
int err;

- sc.gs = REGS_GS(regs->regs.skas.regs);
- sc.fs = REGS_FS(regs->regs.skas.regs);
- sc.es = REGS_ES(regs->regs.skas.regs);
- sc.ds = REGS_DS(regs->regs.skas.regs);
- sc.edi = REGS_EDI(regs->regs.skas.regs);
- sc.esi = REGS_ESI(regs->regs.skas.regs);
- sc.ebp = REGS_EBP(regs->regs.skas.regs);
+ sc.gs = REGS_GS(regs->regs.regs);
+ sc.fs = REGS_FS(regs->regs.regs);
+ sc.es = REGS_ES(regs->regs.regs);
+ sc.ds = REGS_DS(regs->regs.regs);
+ sc.edi = REGS_EDI(regs->regs.regs);
+ sc.esi = REGS_ESI(regs->regs.regs);
+ sc.ebp = REGS_EBP(regs->regs.regs);
sc.esp = sp;
- sc.ebx = REGS_EBX(regs->regs.skas.regs);
- sc.edx = REGS_EDX(regs->regs.skas.regs);
- sc.ecx = REGS_ECX(regs->regs.skas.regs);
- sc.eax = REGS_EAX(regs->regs.skas.regs);
- sc.eip = REGS_IP(regs->regs.skas.regs);
- sc.cs = REGS_CS(regs->regs.skas.regs);
- sc.eflags = REGS_EFLAGS(regs->regs.skas.regs);
- sc.esp_at_signal = regs->regs.skas.regs[UESP];
- sc.ss = regs->regs.skas.regs[SS];
+ sc.ebx = REGS_EBX(regs->regs.regs);
+ sc.edx = REGS_EDX(regs->regs.regs);
+ sc.ecx = REGS_ECX(regs->regs.regs);
+ sc.eax = REGS_EAX(regs->regs.regs);
+ sc.eip = REGS_IP(regs->regs.regs);
+ sc.cs = REGS_CS(regs->regs.regs);
+ sc.eflags = REGS_EFLAGS(regs->regs.regs);
+ sc.esp_at_signal = regs->regs.regs[UESP];
+ sc.ss = regs->regs.regs[SS];
sc.cr2 = fi->cr2;
sc.err = fi->error_code;
sc.trapno = fi->trap_no;
@@ -105,17 +106,6 @@ int copy_sc_to_user_skas(struct sigconte
copy_to_user(to_fp, fpregs, sizeof(fpregs));
}

-static int copy_sc_from_user(struct pt_regs *to, void __user *from)
-{
- return copy_sc_from_user_skas(to, from);
-}
-
-static int copy_sc_to_user(struct sigcontext __user *to, struct _fpstate __user *fp,
- struct pt_regs *from, unsigned long sp)
-{
- return copy_sc_to_user_skas(to, fp, from, sp);
-}
-
static int copy_ucontext_to_user(struct ucontext __user *uc, struct _fpstate __user *fp,
sigset_t *set, unsigned long sp)
{
Index: linux-2.6.22/arch/um/sys-x86_64/signal.c
===================================================================
--- linux-2.6.22.orig/arch/um/sys-x86_64/signal.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/sys-x86_64/signal.c 2007-08-13 17:14:24.000000000 -0400
@@ -16,12 +16,12 @@
#include "frame_kern.h"
#include "skas.h"

-void copy_sc(union uml_pt_regs *regs, void *from)
+void copy_sc(struct uml_pt_regs *regs, void *from)
{
struct sigcontext *sc = from;

#define GETREG(regs, regno, sc, regname) \
- (regs)->skas.regs[(regno) / sizeof(unsigned long)] = (sc)->regname
+ (regs)->regs[(regno) / sizeof(unsigned long)] = (sc)->regname

GETREG(regs, R8, sc, r8);
GETREG(regs, R9, sc, r9);
@@ -46,13 +46,13 @@ void copy_sc(union uml_pt_regs *regs, vo
#undef GETREG
}

-static int copy_sc_from_user_skas(struct pt_regs *regs,
- struct sigcontext __user *from)
+static int copy_sc_from_user(struct pt_regs *regs,
+ struct sigcontext __user *from)
{
int err = 0;

#define GETREG(regs, regno, sc, regname) \
- __get_user((regs)->regs.skas.regs[(regno) / sizeof(unsigned long)], \
+ __get_user((regs)->regs.regs[(regno) / sizeof(unsigned long)], \
&(sc)->regname)

err |= GETREG(regs, R8, from, r8);
@@ -80,10 +80,9 @@ static int copy_sc_from_user_skas(struct
return err;
}

-int copy_sc_to_user_skas(struct sigcontext __user *to,
- struct _fpstate __user *to_fp,
- struct pt_regs *regs, unsigned long mask,
- unsigned long sp)
+static int copy_sc_to_user(struct sigcontext __user *to,
+ struct _fpstate __user *to_fp, struct pt_regs *regs,
+ unsigned long mask, unsigned long sp)
{
struct faultinfo * fi = &current->thread.arch.faultinfo;
int err = 0;
@@ -92,7 +91,7 @@ int copy_sc_to_user_skas(struct sigconte
err |= __put_user(0, &to->fs);

#define PUTREG(regs, regno, sc, regname) \
- __put_user((regs)->regs.skas.regs[(regno) / sizeof(unsigned long)], \
+ __put_user((regs)->regs.regs[(regno) / sizeof(unsigned long)], \
&(sc)->regname)

err |= PUTREG(regs, RDI, to, rdi);
@@ -130,22 +129,6 @@ int copy_sc_to_user_skas(struct sigconte
return(err);
}

-static int copy_sc_from_user(struct pt_regs *to, void __user *from)
-{
- int ret;
-
- ret = copy_sc_from_user_skas(to, from);
- return(ret);
-}
-
-static int copy_sc_to_user(struct sigcontext __user *to,
- struct _fpstate __user *fp,
- struct pt_regs *from, unsigned long mask,
- unsigned long sp)
-{
- return copy_sc_to_user_skas(to, fp, from, mask, sp);
-}
-
struct rt_sigframe
{
char __user *pretcode;
Index: linux-2.6.22/arch/um/include/arch.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/arch.h 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/include/arch.h 2007-08-13 14:21:31.000000000 -0400
@@ -9,7 +9,7 @@
#include "sysdep/ptrace.h"

extern void arch_check_bugs(void);
-extern int arch_fixup(unsigned long address, union uml_pt_regs *regs);
-extern int arch_handle_signal(int sig, union uml_pt_regs *regs);
+extern int arch_fixup(unsigned long address, struct uml_pt_regs *regs);
+extern int arch_handle_signal(int sig, struct uml_pt_regs *regs);

#endif
Index: linux-2.6.22/arch/um/include/as-layout.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/as-layout.h 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/include/as-layout.h 2007-08-13 14:21:31.000000000 -0400
@@ -29,6 +29,6 @@ extern unsigned long brk_start;

extern int linux_main(int argc, char **argv);

-extern void (*sig_info[])(int, union uml_pt_regs *);
+extern void (*sig_info[])(int, struct uml_pt_regs *);

#endif
Index: linux-2.6.22/arch/um/include/irq_user.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/irq_user.h 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/include/irq_user.h 2007-08-13 17:14:24.000000000 -0400
@@ -21,7 +21,7 @@ struct irq_fd {

enum { IRQ_READ, IRQ_WRITE };

-extern void sigio_handler(int sig, union uml_pt_regs *regs);
+extern void sigio_handler(int sig, struct uml_pt_regs *regs);
extern int activate_fd(int irq, int fd, int type, void *dev_id);
extern void free_irq_by_irq_and_dev(unsigned int irq, void *dev_id);
extern void free_irq_by_fd(int fd);
Index: linux-2.6.22/arch/um/include/mconsole.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/mconsole.h 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/include/mconsole.h 2007-08-13 17:14:23.000000000 -0400
@@ -63,7 +63,7 @@ struct mc_request

struct mconsole_request request;
struct mconsole_command *cmd;
- union uml_pt_regs regs;
+ struct uml_pt_regs regs;
};

extern char mconsole_socket_name[];
Index: linux-2.6.22/arch/um/include/os.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/os.h 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/include/os.h 2007-08-13 17:14:24.000000000 -0400
@@ -281,9 +281,9 @@ extern int protect(struct mm_id * mm_idp
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 save_registers(int pid, union uml_pt_regs *regs);
-extern void restore_registers(int pid, union uml_pt_regs *regs);
-extern void userspace(union uml_pt_regs *regs);
+extern void save_registers(int pid, struct uml_pt_regs *regs);
+extern void restore_registers(int pid, struct uml_pt_regs *regs);
+extern void userspace(struct uml_pt_regs *regs);
extern void 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));
Index: linux-2.6.22/arch/um/include/registers.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/registers.h 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/include/registers.h 2007-08-13 14:21:31.000000000 -0400
@@ -9,11 +9,11 @@
#include "sysdep/ptrace.h"
#include "sysdep/archsetjmp.h"

-extern void init_thread_registers(union uml_pt_regs *to);
+extern void init_thread_registers(struct uml_pt_regs *to);
extern int save_fp_registers(int pid, unsigned long *fp_regs);
extern int restore_fp_registers(int pid, unsigned long *fp_regs);
-extern void save_registers(int pid, union uml_pt_regs *regs);
-extern void restore_registers(int pid, union uml_pt_regs *regs);
+extern void save_registers(int pid, struct uml_pt_regs *regs);
+extern void restore_registers(int pid, struct uml_pt_regs *regs);
extern void init_registers(int pid);
extern void get_safe_registers(unsigned long *regs);
extern unsigned long get_thread_reg(int reg, jmp_buf *buf);
Index: linux-2.6.22/arch/um/include/skas/mmu-skas.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/skas/mmu-skas.h 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/include/skas/mmu-skas.h 2007-08-13 17:14:23.000000000 -0400
@@ -18,6 +18,6 @@ struct mmu_context_skas {
uml_ldt_t ldt;
};

-extern void switch_mm_skas(struct mm_id * mm_idp);
+extern void __switch_mm(struct mm_id * mm_idp);

#endif
Index: linux-2.6.22/arch/um/include/skas/skas.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/skas/skas.h 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/include/skas/skas.h 2007-08-13 17:14:24.000000000 -0400
@@ -15,7 +15,7 @@ extern int skas_needs_stub;

extern int user_thread(unsigned long stack, int flags);
extern void new_thread_handler(void);
-extern void handle_syscall(union uml_pt_regs *regs);
+extern void handle_syscall(struct uml_pt_regs *regs);
extern int new_mm(unsigned long stack);
extern void get_skas_faultinfo(int pid, struct faultinfo * fi);
extern long execute_syscall_skas(void *r);
Index: linux-2.6.22/arch/um/include/task.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/task.h 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/include/task.h 2007-08-13 14:21:31.000000000 -0400
@@ -3,7 +3,7 @@

#include <kern_constants.h>

-#define TASK_REGS(task) ((union uml_pt_regs *) &(((char *) (task))[HOST_TASK_REGS]))
+#define TASK_REGS(task) ((struct uml_pt_regs *) &(((char *) (task))[HOST_TASK_REGS]))
#define TASK_PID(task) *((int *) &(((char *) (task))[HOST_TASK_PID]))

#endif
Index: linux-2.6.22/arch/um/kernel/irq.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/irq.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/irq.c 2007-08-13 17:14:24.000000000 -0400
@@ -91,7 +91,7 @@ static struct irq_fd **last_irq_ptr = &a

extern void free_irqs(void);

-void sigio_handler(int sig, union uml_pt_regs *regs)
+void sigio_handler(int sig, struct uml_pt_regs *regs)
{
struct irq_fd *irq_fd;
int n;
@@ -344,7 +344,7 @@ int deactivate_all_fds(void)
* SMP cross-CPU interrupts have their own specific
* handlers).
*/
-unsigned int do_IRQ(int irq, union uml_pt_regs *regs)
+unsigned int do_IRQ(int irq, struct uml_pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs((struct pt_regs *)regs);
irq_enter();
Index: linux-2.6.22/arch/um/kernel/trap.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/trap.c 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/trap.c 2007-08-13 17:14:24.000000000 -0400
@@ -128,7 +128,7 @@ static void bad_segv(struct faultinfo fi
force_sig_info(SIGSEGV, &si, current);
}

-static void segv_handler(int sig, union uml_pt_regs *regs)
+static void segv_handler(int sig, struct uml_pt_regs *regs)
{
struct faultinfo * fi = UPT_FAULTINFO(regs);

@@ -146,7 +146,7 @@ static void segv_handler(int sig, union
* give us bad data!
*/
unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user,
- union uml_pt_regs *regs)
+ struct uml_pt_regs *regs)
{
struct siginfo si;
void *catcher;
@@ -214,7 +214,7 @@ unsigned long segv(struct faultinfo fi,
return 0;
}

-void relay_signal(int sig, union uml_pt_regs *regs)
+void relay_signal(int sig, struct uml_pt_regs *regs)
{
if (arch_handle_signal(sig, regs))
return;
@@ -230,14 +230,14 @@ void relay_signal(int sig, union uml_pt_
force_sig(sig, current);
}

-static void bus_handler(int sig, union uml_pt_regs *regs)
+static void bus_handler(int sig, struct uml_pt_regs *regs)
{
if (current->thread.fault_catcher != NULL)
do_longjmp(current->thread.fault_catcher, 1);
else relay_signal(sig, regs);
}

-static void winch(int sig, union uml_pt_regs *regs)
+static void winch(int sig, struct uml_pt_regs *regs)
{
do_IRQ(WINCH_IRQ, regs);
}
Index: linux-2.6.22/arch/um/sys-i386/bugs.c
===================================================================
--- linux-2.6.22.orig/arch/um/sys-i386/bugs.c 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/sys-i386/bugs.c 2007-08-13 17:14:24.000000000 -0400
@@ -162,7 +162,7 @@ void arch_check_bugs(void)
host_has_xmm = have_it;
}

-int arch_handle_signal(int sig, union uml_pt_regs *regs)
+int arch_handle_signal(int sig, struct uml_pt_regs *regs)
{
unsigned char tmp[2];

Index: linux-2.6.22/arch/um/sys-i386/fault.c
===================================================================
--- linux-2.6.22.orig/arch/um/sys-i386/fault.c 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/sys-i386/fault.c 2007-08-13 17:14:24.000000000 -0400
@@ -15,7 +15,7 @@ struct exception_table_entry
const struct exception_table_entry *search_exception_tables(unsigned long add);

/* Compare this to arch/i386/mm/extable.c:fixup_exception() */
-int arch_fixup(unsigned long address, union uml_pt_regs *regs)
+int arch_fixup(unsigned long address, struct uml_pt_regs *regs)
{
const struct exception_table_entry *fixup;

Index: linux-2.6.22/arch/um/sys-x86_64/bugs.c
===================================================================
--- linux-2.6.22.orig/arch/um/sys-x86_64/bugs.c 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/sys-x86_64/bugs.c 2007-08-13 14:21:31.000000000 -0400
@@ -14,7 +14,7 @@ void arch_check_bugs(void)
{
}

-int arch_handle_signal(int sig, union uml_pt_regs *regs)
+int arch_handle_signal(int sig, struct uml_pt_regs *regs)
{
return 0;
}
Index: linux-2.6.22/arch/um/sys-x86_64/fault.c
===================================================================
--- linux-2.6.22.orig/arch/um/sys-x86_64/fault.c 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/sys-x86_64/fault.c 2007-08-13 17:14:24.000000000 -0400
@@ -14,7 +14,7 @@ struct exception_table_entry
};

const struct exception_table_entry *search_exception_tables(unsigned long add);
-int arch_fixup(unsigned long address, union uml_pt_regs *regs)
+int arch_fixup(unsigned long address, struct uml_pt_regs *regs)
{
const struct exception_table_entry *fixup;

Index: linux-2.6.22/include/asm-um/mmu_context.h
===================================================================
--- linux-2.6.22.orig/include/asm-um/mmu_context.h 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/include/asm-um/mmu_context.h 2007-08-13 17:14:24.000000000 -0400
@@ -29,7 +29,7 @@ static inline void activate_mm(struct mm
* possible.
*/
if (old != new && (current->flags & PF_BORROWED_MM))
- switch_mm_skas(&new->context.skas.id);
+ __switch_mm(&new->context.skas.id);
}

static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
@@ -41,7 +41,7 @@ static inline void switch_mm(struct mm_s
cpu_clear(cpu, prev->cpu_vm_mask);
cpu_set(cpu, next->cpu_vm_mask);
if(next != &init_mm)
- switch_mm_skas(&next->context.skas.id);
+ __switch_mm(&next->context.skas.id);
}
}

@@ -50,21 +50,9 @@ static inline void enter_lazy_tlb(struct
{
}

-extern int init_new_context_skas(struct task_struct *task,
- struct mm_struct *mm);
+extern int init_new_context(struct task_struct *task, struct mm_struct *mm);

-static inline int init_new_context(struct task_struct *task,
- struct mm_struct *mm)
-{
- return(init_new_context_skas(task, mm));
-}
-
-extern void destroy_context_skas(struct mm_struct *mm);
-
-static inline void destroy_context(struct mm_struct *mm)
-{
- destroy_context_skas(mm);
-}
+extern void destroy_context(struct mm_struct *mm);

#endif

Index: linux-2.6.22/include/asm-um/ptrace-generic.h
===================================================================
--- linux-2.6.22.orig/include/asm-um/ptrace-generic.h 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/include/asm-um/ptrace-generic.h 2007-08-13 17:14:24.000000000 -0400
@@ -12,7 +12,7 @@
#include "sysdep/ptrace.h"

struct pt_regs {
- union uml_pt_regs regs;
+ struct uml_pt_regs regs;
};

#define EMPTY_REGS { .regs = EMPTY_UML_PT_REGS }
@@ -44,7 +44,7 @@ extern int set_fpxregs(unsigned long buf

extern void show_regs(struct pt_regs *regs);

-extern void send_sigtrap(struct task_struct *tsk, union uml_pt_regs *regs,
+extern void send_sigtrap(struct task_struct *tsk, struct uml_pt_regs *regs,
int error_code);

extern int arch_copy_tls(struct task_struct *new);
Index: linux-2.6.22/include/asm-um/ptrace-i386.h
===================================================================
--- linux-2.6.22.orig/include/asm-um/ptrace-i386.h 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/include/asm-um/ptrace-i386.h 2007-08-13 17:14:24.000000000 -0400
@@ -46,21 +46,4 @@ extern int ptrace_get_thread_area(struct
extern int ptrace_set_thread_area(struct task_struct *child, int idx,
struct user_desc __user *user_desc);

-extern int do_set_thread_area_skas(struct user_desc *info);
-extern int do_get_thread_area_skas(struct user_desc *info);
-
-extern int do_set_thread_area_tt(struct user_desc *info);
-extern int do_get_thread_area_tt(struct user_desc *info);
-
-extern int arch_switch_tls_skas(struct task_struct *from, struct task_struct *to);
-extern int arch_switch_tls_tt(struct task_struct *from, struct task_struct *to);
-
-extern void arch_switch_to_tt(struct task_struct *from, struct task_struct *to);
-extern void arch_switch_to_skas(struct task_struct *from, struct task_struct *to);
-
-extern int do_get_thread_area_skas(struct user_desc *info);
-extern int do_set_thread_area_skas(struct user_desc *info);
-
-struct task_struct;
-
#endif
Index: linux-2.6.22/include/asm-um/ptrace-x86_64.h
===================================================================
--- linux-2.6.22.orig/include/asm-um/ptrace-x86_64.h 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/include/asm-um/ptrace-x86_64.h 2007-08-13 14:21:31.000000000 -0400
@@ -76,15 +76,6 @@ static inline int ptrace_set_thread_area
return -ENOSYS;
}

-static inline void arch_switch_to_tt(struct task_struct *from,
- struct task_struct *to)
-{
-}
-
-extern void arch_switch_to_skas(struct task_struct *from,
- struct task_struct *to);
-
-extern long arch_prctl_skas(struct task_struct *task, int code,
- unsigned long __user *addr);
-
+extern long arch_prctl(struct task_struct *task, int code,
+ unsigned long __user *addr);
#endif
Index: linux-2.6.22/arch/um/sys-x86_64/tls.c
===================================================================
--- linux-2.6.22.orig/arch/um/sys-x86_64/tls.c 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/sys-x86_64/tls.c 2007-08-13 17:14:24.000000000 -0400
@@ -11,7 +11,7 @@ int arch_copy_tls(struct task_struct *t)
* (which is argument 5, child_tid, of clone) so it can be set
* during context switches.
*/
- t->thread.arch.fs = t->thread.regs.regs.skas.regs[R8 / sizeof(long)];
+ t->thread.arch.fs = t->thread.regs.regs.regs[R8 / sizeof(long)];

return 0;
}
Index: linux-2.6.22/arch/um/kernel/skas/tlb.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/skas/tlb.c 2007-08-13 14:19:07.000000000 -0400
+++ /dev/null 1970-01-01 00:00:00.000000000 +0000
@@ -1,164 +0,0 @@
-/*
- * Copyright (C) 2002 Jeff Dike ([email protected])
- * Copyright 2003 PathScale, Inc.
- * Licensed under the GPL
- */
-
-#include "linux/stddef.h"
-#include "linux/sched.h"
-#include "linux/mm.h"
-#include "asm/page.h"
-#include "asm/pgtable.h"
-#include "asm/mmu.h"
-#include "mem_user.h"
-#include "mem.h"
-#include "skas.h"
-#include "os.h"
-#include "tlb.h"
-
-static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
- int finished, void **flush)
-{
- struct host_vm_op *op;
- int i, ret = 0;
-
- for(i = 0; i <= last && !ret; i++){
- op = &ops[i];
- switch(op->type){
- case MMAP:
- ret = map(&mmu->skas.id, op->u.mmap.addr,
- op->u.mmap.len, op->u.mmap.prot,
- op->u.mmap.fd, op->u.mmap.offset, finished,
- flush);
- break;
- case MUNMAP:
- ret = unmap(&mmu->skas.id, op->u.munmap.addr,
- op->u.munmap.len, finished, flush);
- break;
- case MPROTECT:
- ret = protect(&mmu->skas.id, op->u.mprotect.addr,
- op->u.mprotect.len, op->u.mprotect.prot,
- finished, flush);
- break;
- default:
- printk("Unknown op type %d in do_ops\n", op->type);
- break;
- }
- }
-
- return ret;
-}
-
-extern int proc_mm;
-
-static void fix_range(struct mm_struct *mm, unsigned long start_addr,
- unsigned long end_addr, int force)
-{
- if(!proc_mm && (end_addr > CONFIG_STUB_START))
- end_addr = CONFIG_STUB_START;
-
- fix_range_common(mm, start_addr, end_addr, force, do_ops);
-}
-
-void __flush_tlb_one_skas(unsigned long addr)
-{
- flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
-}
-
-void flush_tlb_range_skas(struct vm_area_struct *vma, unsigned long start,
- unsigned long end)
-{
- if(vma->vm_mm == NULL)
- flush_tlb_kernel_range_common(start, end);
- else fix_range(vma->vm_mm, start, end, 0);
-}
-
-void flush_tlb_mm_skas(struct mm_struct *mm)
-{
- unsigned long end;
-
- /* Don't bother flushing if this address space is about to be
- * destroyed.
- */
- if(atomic_read(&mm->mm_users) == 0)
- return;
-
- end = proc_mm ? task_size : CONFIG_STUB_START;
- fix_range(mm, 0, end, 0);
-}
-
-void force_flush_all_skas(void)
-{
- struct mm_struct *mm = current->mm;
- struct vm_area_struct *vma = mm->mmap;
-
- while(vma != NULL) {
- fix_range(mm, vma->vm_start, vma->vm_end, 1);
- vma = vma->vm_next;
- }
-}
-
-void flush_tlb_page_skas(struct vm_area_struct *vma, unsigned long address)
-{
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
- struct mm_struct *mm = vma->vm_mm;
- void *flush = NULL;
- int r, w, x, prot, err = 0;
- struct mm_id *mm_id;
-
- pgd = pgd_offset(mm, address);
- if(!pgd_present(*pgd))
- goto kill;
-
- pud = pud_offset(pgd, address);
- if(!pud_present(*pud))
- goto kill;
-
- pmd = pmd_offset(pud, address);
- if(!pmd_present(*pmd))
- goto kill;
-
- pte = pte_offset_kernel(pmd, address);
-
- r = pte_read(*pte);
- w = pte_write(*pte);
- x = pte_exec(*pte);
- if (!pte_young(*pte)) {
- r = 0;
- w = 0;
- } else if (!pte_dirty(*pte)) {
- w = 0;
- }
-
- mm_id = &mm->context.skas.id;
- prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
- (x ? UM_PROT_EXEC : 0));
- if(pte_newpage(*pte)){
- if(pte_present(*pte)){
- unsigned long long offset;
- int fd;
-
- fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
- err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
- 1, &flush);
- }
- else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
- }
- else if(pte_newprot(*pte))
- err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
-
- if(err)
- goto kill;
-
- *pte = pte_mkuptodate(*pte);
-
- return;
-
-kill:
- printk("Failed to flush page for address 0x%lx\n", address);
- force_sig(SIGKILL, current);
-}
-
Index: linux-2.6.22/include/asm-um/tlbflush.h
===================================================================
--- linux-2.6.22.orig/include/asm-um/tlbflush.h 2007-08-13 14:21:31.000000000 -0400
+++ linux-2.6.22/include/asm-um/tlbflush.h 2007-08-13 14:21:31.000000000 -0400
@@ -24,18 +24,7 @@ extern void flush_tlb_all(void);
extern void flush_tlb_mm(struct mm_struct *mm);
extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end);
-extern void flush_tlb_page_skas(struct vm_area_struct *vma,
- unsigned long address);
-
-static inline void flush_tlb_page(struct vm_area_struct *vma,
- unsigned long address)
-{
- address &= PAGE_MASK;
-
- flush_tlb_page_skas(vma, address);
-}
-
-extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
+extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long address);
extern void flush_tlb_kernel_vm(void);
extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
extern void __flush_tlb_one(unsigned long addr);
Index: linux-2.6.22/arch/um/kernel/skas/mmu.c
===================================================================
--- linux-2.6.22.orig/arch/um/kernel/skas/mmu.c 2007-08-13 14:19:07.000000000 -0400
+++ linux-2.6.22/arch/um/kernel/skas/mmu.c 2007-08-13 17:14:24.000000000 -0400
@@ -71,7 +71,7 @@ static int init_stub_pte(struct mm_struc
return(-ENOMEM);
}

-int init_new_context_skas(struct task_struct *task, struct mm_struct *mm)
+int init_new_context(struct task_struct *task, struct mm_struct *mm)
{
struct mmu_context_skas *from_mm = NULL;
struct mmu_context_skas *to_mm = &mm->context.skas;
@@ -137,7 +137,7 @@ int init_new_context_skas(struct task_st
return ret;
}

-void destroy_context_skas(struct mm_struct *mm)
+void destroy_context(struct mm_struct *mm)
{
struct mmu_context_skas *mmu = &mm->context.skas;

Index: linux-2.6.22/arch/um/include/mode_kern.h
===================================================================
--- linux-2.6.22.orig/arch/um/include/mode_kern.h 2007-08-13 14:21:31.000000000 -0400
+++ /dev/null 1970-01-01 00:00:00.000000000 +0000
@@ -1,11 +0,0 @@
-/*
- * Copyright (C) 2002 Jeff Dike ([email protected])
- * Licensed under the GPL
- */
-
-#ifndef __MODE_KERN_H__
-#define __MODE_KERN_H__
-
-#include "mode_kern_skas.h"
-
-#endif