x86_64: prepare shared kernel/process.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 903 deletions

diff --git a/arch/x86_64/kernel/process.c b/arch/x86_64/kernel/process.c
deleted file mode 100644
index 98956555450..00000000000
--- a/arch/x86_64/kernel/process.c
+++ /dev/null
@@ -1,903 +0,0 @@
-/*
- *  linux/arch/x86-64/kernel/process.c
- *
- *  Copyright (C) 1995  Linus Torvalds
- *
- *  Pentium III FXSR, SSE support
- *	Gareth Hughes <gareth@valinux.com>, May 2000
- * 
- *  X86-64 port
- *	Andi Kleen.
- *
- *	CPU hotplug support - ashok.raj@intel.com
- */
-
-/*
- * This file handles the architecture-dependent parts of process handling..
- */
-
-#include <stdarg.h>
-
-#include <linux/cpu.h>
-#include <linux/errno.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/fs.h>
-#include <linux/elfcore.h>
-#include <linux/smp.h>
-#include <linux/slab.h>
-#include <linux/user.h>
-#include <linux/module.h>
-#include <linux/a.out.h>
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-#include <linux/ptrace.h>
-#include <linux/utsname.h>
-#include <linux/random.h>
-#include <linux/notifier.h>
-#include <linux/kprobes.h>
-#include <linux/kdebug.h>
-
-#include <asm/uaccess.h>
-#include <asm/pgtable.h>
-#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/processor.h>
-#include <asm/i387.h>
-#include <asm/mmu_context.h>
-#include <asm/pda.h>
-#include <asm/prctl.h>
-#include <asm/desc.h>
-#include <asm/proto.h>
-#include <asm/ia32.h>
-#include <asm/idle.h>
-
-asmlinkage extern void ret_from_fork(void);
-
-unsigned long kernel_thread_flags = CLONE_VM | CLONE_UNTRACED;
-
-unsigned long boot_option_idle_override = 0;
-EXPORT_SYMBOL(boot_option_idle_override);
-
-/*
- * Powermanagement idle function, if any..
- */
-void (*pm_idle)(void);
-EXPORT_SYMBOL(pm_idle);
-static DEFINE_PER_CPU(unsigned int, cpu_idle_state);
-
-static ATOMIC_NOTIFIER_HEAD(idle_notifier);
-
-void idle_notifier_register(struct notifier_block *n)
-{
-	atomic_notifier_chain_register(&idle_notifier, n);
-}
-EXPORT_SYMBOL_GPL(idle_notifier_register);
-
-void idle_notifier_unregister(struct notifier_block *n)
-{
-	atomic_notifier_chain_unregister(&idle_notifier, n);
-}
-EXPORT_SYMBOL(idle_notifier_unregister);
-
-void enter_idle(void)
-{
-	write_pda(isidle, 1);
-	atomic_notifier_call_chain(&idle_notifier, IDLE_START, NULL);
-}
-
-static void __exit_idle(void)
-{
-	if (test_and_clear_bit_pda(0, isidle) == 0)
-		return;
-	atomic_notifier_call_chain(&idle_notifier, IDLE_END, NULL);
-}
-
-/* Called from interrupts to signify idle end */
-void exit_idle(void)
-{
-	/* idle loop has pid 0 */
-	if (current->pid)
-		return;
-	__exit_idle();
-}
-
-/*
- * We use this if we don't have any better
- * idle routine..
- */
-static void default_idle(void)
-{
-	current_thread_info()->status &= ~TS_POLLING;
-	/*
-	 * TS_POLLING-cleared state must be visible before we
-	 * test NEED_RESCHED:
-	 */
-	smp_mb();
-	local_irq_disable();
-	if (!need_resched()) {
-		/* Enables interrupts one instruction before HLT.
-		   x86 special cases this so there is no race. */
-		safe_halt();
-	} else
-		local_irq_enable();
-	current_thread_info()->status |= TS_POLLING;
-}
-
-/*
- * On SMP it's slightly faster (but much more power-consuming!)
- * to poll the ->need_resched flag instead of waiting for the
- * cross-CPU IPI to arrive. Use this option with caution.
- */
-static void poll_idle (void)
-{
-	local_irq_enable();
-	cpu_relax();
-}
-
-void cpu_idle_wait(void)
-{
-	unsigned int cpu, this_cpu = get_cpu();
-	cpumask_t map, tmp = current->cpus_allowed;
-
-	set_cpus_allowed(current, cpumask_of_cpu(this_cpu));
-	put_cpu();
-
-	cpus_clear(map);
-	for_each_online_cpu(cpu) {
-		per_cpu(cpu_idle_state, cpu) = 1;
-		cpu_set(cpu, map);
-	}
-
-	__get_cpu_var(cpu_idle_state) = 0;
-
-	wmb();
-	do {
-		ssleep(1);
-		for_each_online_cpu(cpu) {
-			if (cpu_isset(cpu, map) &&
-					!per_cpu(cpu_idle_state, cpu))
-				cpu_clear(cpu, map);
-		}
-		cpus_and(map, map, cpu_online_map);
-	} while (!cpus_empty(map));
-
-	set_cpus_allowed(current, tmp);
-}
-EXPORT_SYMBOL_GPL(cpu_idle_wait);
-
-#ifdef CONFIG_HOTPLUG_CPU
-DECLARE_PER_CPU(int, cpu_state);
-
-#include <asm/nmi.h>
-/* We halt the CPU with physical CPU hotplug */
-static inline void play_dead(void)
-{
-	idle_task_exit();
-	wbinvd();
-	mb();
-	/* Ack it */
-	__get_cpu_var(cpu_state) = CPU_DEAD;
-
-	local_irq_disable();
-	while (1)
-		halt();
-}
-#else
-static inline void play_dead(void)
-{
-	BUG();
-}
-#endif /* CONFIG_HOTPLUG_CPU */
-
-/*
- * The idle thread. There's no useful work to be
- * done, so just try to conserve power and have a
- * low exit latency (ie sit in a loop waiting for
- * somebody to say that they'd like to reschedule)
- */
-void cpu_idle (void)
-{
-	current_thread_info()->status |= TS_POLLING;
-	/* endless idle loop with no priority at all */
-	while (1) {
-		while (!need_resched()) {
-			void (*idle)(void);
-
-			if (__get_cpu_var(cpu_idle_state))
-				__get_cpu_var(cpu_idle_state) = 0;
-
-			rmb();
-			idle = pm_idle;
-			if (!idle)
-				idle = default_idle;
-			if (cpu_is_offline(smp_processor_id()))
-				play_dead();
-			/*
-			 * Idle routines should keep interrupts disabled
-			 * from here on, until they go to idle.
-			 * Otherwise, idle callbacks can misfire.
-			 */
-			local_irq_disable();
-			enter_idle();
-			idle();
-			/* In many cases the interrupt that ended idle
-			   has already called exit_idle. But some idle
-			   loops can be woken up without interrupt. */
-			__exit_idle();
-		}
-
-		preempt_enable_no_resched();
-		schedule();
-		preempt_disable();
-	}
-}
-
-/*
- * This uses new MONITOR/MWAIT instructions on P4 processors with PNI,
- * which can obviate IPI to trigger checking of need_resched.
- * We execute MONITOR against need_resched and enter optimized wait state
- * through MWAIT. Whenever someone changes need_resched, we would be woken
- * up from MWAIT (without an IPI).
- *
- * New with Core Duo processors, MWAIT can take some hints based on CPU
- * capability.
- */
-void mwait_idle_with_hints(unsigned long eax, unsigned long ecx)
-{
-	if (!need_resched()) {
-		__monitor((void *)&current_thread_info()->flags, 0, 0);
-		smp_mb();
-		if (!need_resched())
-			__mwait(eax, ecx);
-	}
-}
-
-/* Default MONITOR/MWAIT with no hints, used for default C1 state */
-static void mwait_idle(void)
-{
-	if (!need_resched()) {
-		__monitor((void *)&current_thread_info()->flags, 0, 0);
-		smp_mb();
-		if (!need_resched())
-			__sti_mwait(0, 0);
-		else
-			local_irq_enable();
-	} else {
-		local_irq_enable();
-	}
-}
-
-void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
-{
-	static int printed;
-	if (cpu_has(c, X86_FEATURE_MWAIT)) {
-		/*
-		 * Skip, if setup has overridden idle.
-		 * One CPU supports mwait => All CPUs supports mwait
-		 */
-		if (!pm_idle) {
-			if (!printed) {
-				printk(KERN_INFO "using mwait in idle threads.\n");
-				printed = 1;
-			}
-			pm_idle = mwait_idle;
-		}
-	}
-}
-
-static int __init idle_setup (char *str)
-{
-	if (!strcmp(str, "poll")) {
-		printk("using polling idle threads.\n");
-		pm_idle = poll_idle;
-	} else if (!strcmp(str, "mwait"))
-		force_mwait = 1;
-	else
-		return -1;
-
-	boot_option_idle_override = 1;
-	return 0;
-}
-early_param("idle", idle_setup);
-
-/* Prints also some state that isn't saved in the pt_regs */ 
-void __show_regs(struct pt_regs * regs)
-{
-	unsigned long cr0 = 0L, cr2 = 0L, cr3 = 0L, cr4 = 0L, fs, gs, shadowgs;
-	unsigned long d0, d1, d2, d3, d6, d7;
-	unsigned int fsindex,gsindex;
-	unsigned int ds,cs,es; 
-
-	printk("\n");
-	print_modules();
-	printk("Pid: %d, comm: %.20s %s %s %.*s\n",
-		current->pid, current->comm, print_tainted(),
-		init_utsname()->release,
-		(int)strcspn(init_utsname()->version, " "),
-		init_utsname()->version);
-	printk("RIP: %04lx:[<%016lx>] ", regs->cs & 0xffff, regs->rip);
-	printk_address(regs->rip); 
-	printk("RSP: %04lx:%016lx  EFLAGS: %08lx\n", regs->ss, regs->rsp,
-		regs->eflags);
-	printk("RAX: %016lx RBX: %016lx RCX: %016lx\n",
-	       regs->rax, regs->rbx, regs->rcx);
-	printk("RDX: %016lx RSI: %016lx RDI: %016lx\n",
-	       regs->rdx, regs->rsi, regs->rdi); 
-	printk("RBP: %016lx R08: %016lx R09: %016lx\n",
-	       regs->rbp, regs->r8, regs->r9); 
-	printk("R10: %016lx R11: %016lx R12: %016lx\n",
-	       regs->r10, regs->r11, regs->r12); 
-	printk("R13: %016lx R14: %016lx R15: %016lx\n",
-	       regs->r13, regs->r14, regs->r15); 
-
-	asm("movl %%ds,%0" : "=r" (ds)); 
-	asm("movl %%cs,%0" : "=r" (cs)); 
-	asm("movl %%es,%0" : "=r" (es)); 
-	asm("movl %%fs,%0" : "=r" (fsindex));
-	asm("movl %%gs,%0" : "=r" (gsindex));
-
-	rdmsrl(MSR_FS_BASE, fs);
-	rdmsrl(MSR_GS_BASE, gs); 
-	rdmsrl(MSR_KERNEL_GS_BASE, shadowgs); 
-
-	cr0 = read_cr0();
-	cr2 = read_cr2();
-	cr3 = read_cr3();
-	cr4 = read_cr4();
-
-	printk("FS:  %016lx(%04x) GS:%016lx(%04x) knlGS:%016lx\n", 
-	       fs,fsindex,gs,gsindex,shadowgs); 
-	printk("CS:  %04x DS: %04x ES: %04x CR0: %016lx\n", cs, ds, es, cr0); 
-	printk("CR2: %016lx CR3: %016lx CR4: %016lx\n", cr2, cr3, cr4);
-
-	get_debugreg(d0, 0);
-	get_debugreg(d1, 1);
-	get_debugreg(d2, 2);
-	printk("DR0: %016lx DR1: %016lx DR2: %016lx\n", d0, d1, d2);
-	get_debugreg(d3, 3);
-	get_debugreg(d6, 6);
-	get_debugreg(d7, 7);
-	printk("DR3: %016lx DR6: %016lx DR7: %016lx\n", d3, d6, d7);
-}
-
-void show_regs(struct pt_regs *regs)
-{
-	printk("CPU %d:", smp_processor_id());
-	__show_regs(regs);
-	show_trace(NULL, regs, (void *)(regs + 1));
-}
-
-/*
- * Free current thread data structures etc..
- */
-void exit_thread(void)
-{
-	struct task_struct *me = current;
-	struct thread_struct *t = &me->thread;
-
-	if (me->thread.io_bitmap_ptr) { 
-		struct tss_struct *tss = &per_cpu(init_tss, get_cpu());
-
-		kfree(t->io_bitmap_ptr);
-		t->io_bitmap_ptr = NULL;
-		clear_thread_flag(TIF_IO_BITMAP);
-		/*
-		 * Careful, clear this in the TSS too:
-		 */
-		memset(tss->io_bitmap, 0xff, t->io_bitmap_max);
-		t->io_bitmap_max = 0;
-		put_cpu();
-	}
-}
-
-void flush_thread(void)
-{
-	struct task_struct *tsk = current;
-
-	if (test_tsk_thread_flag(tsk, TIF_ABI_PENDING)) {
-		clear_tsk_thread_flag(tsk, TIF_ABI_PENDING);
-		if (test_tsk_thread_flag(tsk, TIF_IA32)) {
-			clear_tsk_thread_flag(tsk, TIF_IA32);
-		} else {
-			set_tsk_thread_flag(tsk, TIF_IA32);
-			current_thread_info()->status |= TS_COMPAT;
-		}
-	}
-	clear_tsk_thread_flag(tsk, TIF_DEBUG);
-
-	tsk->thread.debugreg0 = 0;
-	tsk->thread.debugreg1 = 0;
-	tsk->thread.debugreg2 = 0;
-	tsk->thread.debugreg3 = 0;
-	tsk->thread.debugreg6 = 0;
-	tsk->thread.debugreg7 = 0;
-	memset(tsk->thread.tls_array, 0, sizeof(tsk->thread.tls_array));	
-	/*
-	 * Forget coprocessor state..
-	 */
-	clear_fpu(tsk);
-	clear_used_math();
-}
-
-void release_thread(struct task_struct *dead_task)
-{
-	if (dead_task->mm) {
-		if (dead_task->mm->context.size) {
-			printk("WARNING: dead process %8s still has LDT? <%p/%d>\n",
-					dead_task->comm,
-					dead_task->mm->context.ldt,
-					dead_task->mm->context.size);
-			BUG();
-		}
-	}
-}
-
-static inline void set_32bit_tls(struct task_struct *t, int tls, u32 addr)
-{
-	struct user_desc ud = { 
-		.base_addr = addr,
-		.limit = 0xfffff,
-		.seg_32bit = 1,
-		.limit_in_pages = 1,
-		.useable = 1,
-	};
-	struct n_desc_struct *desc = (void *)t->thread.tls_array;
-	desc += tls;
-	desc->a = LDT_entry_a(&ud); 
-	desc->b = LDT_entry_b(&ud); 
-}
-
-static inline u32 read_32bit_tls(struct task_struct *t, int tls)
-{
-	struct desc_struct *desc = (void *)t->thread.tls_array;
-	desc += tls;
-	return desc->base0 | 
-		(((u32)desc->base1) << 16) | 
-		(((u32)desc->base2) << 24);
-}
-
-/*
- * This gets called before we allocate a new thread and copy
- * the current task into it.
- */
-void prepare_to_copy(struct task_struct *tsk)
-{
-	unlazy_fpu(tsk);
-}
-
-int copy_thread(int nr, unsigned long clone_flags, unsigned long rsp, 
-		unsigned long unused,
-	struct task_struct * p, struct pt_regs * regs)
-{
-	int err;
-	struct pt_regs * childregs;
-	struct task_struct *me = current;
-
-	childregs = ((struct pt_regs *)
-			(THREAD_SIZE + task_stack_page(p))) - 1;
-	*childregs = *regs;
-
-	childregs->rax = 0;
-	childregs->rsp = rsp;
-	if (rsp == ~0UL)
-		childregs->rsp = (unsigned long)childregs;
-
-	p->thread.rsp = (unsigned long) childregs;
-	p->thread.rsp0 = (unsigned long) (childregs+1);
-	p->thread.userrsp = me->thread.userrsp; 
-
-	set_tsk_thread_flag(p, TIF_FORK);
-
-	p->thread.fs = me->thread.fs;
-	p->thread.gs = me->thread.gs;
-
-	asm("mov %%gs,%0" : "=m" (p->thread.gsindex));
-	asm("mov %%fs,%0" : "=m" (p->thread.fsindex));
-	asm("mov %%es,%0" : "=m" (p->thread.es));
-	asm("mov %%ds,%0" : "=m" (p->thread.ds));
-
-	if (unlikely(test_tsk_thread_flag(me, TIF_IO_BITMAP))) {
-		p->thread.io_bitmap_ptr = kmalloc(IO_BITMAP_BYTES, GFP_KERNEL);
-		if (!p->thread.io_bitmap_ptr) {
-			p->thread.io_bitmap_max = 0;
-			return -ENOMEM;
-		}
-		memcpy(p->thread.io_bitmap_ptr, me->thread.io_bitmap_ptr,
-				IO_BITMAP_BYTES);
-		set_tsk_thread_flag(p, TIF_IO_BITMAP);
-	} 
-
-	/*
-	 * Set a new TLS for the child thread?
-	 */
-	if (clone_flags & CLONE_SETTLS) {
-#ifdef CONFIG_IA32_EMULATION
-		if (test_thread_flag(TIF_IA32))
-			err = ia32_child_tls(p, childregs); 
-		else 			
-#endif	 
-			err = do_arch_prctl(p, ARCH_SET_FS, childregs->r8); 
-		if (err) 
-			goto out;
-	}
-	err = 0;
-out:
-	if (err && p->thread.io_bitmap_ptr) {
-		kfree(p->thread.io_bitmap_ptr);
-		p->thread.io_bitmap_max = 0;
-	}
-	return err;
-}
-
-/*
- * This special macro can be used to load a debugging register
- */
-#define loaddebug(thread,r) set_debugreg(thread->debugreg ## r, r)
-
-static inline void __switch_to_xtra(struct task_struct *prev_p,
-			     	    struct task_struct *next_p,
-			     	    struct tss_struct *tss)
-{
-	struct thread_struct *prev, *next;
-
-	prev = &prev_p->thread,
-	next = &next_p->thread;
-
-	if (test_tsk_thread_flag(next_p, TIF_DEBUG)) {
-		loaddebug(next, 0);
-		loaddebug(next, 1);
-		loaddebug(next, 2);
-		loaddebug(next, 3);
-		/* no 4 and 5 */
-		loaddebug(next, 6);
-		loaddebug(next, 7);
-	}
-
-	if (test_tsk_thread_flag(next_p, TIF_IO_BITMAP)) {
-		/*
-		 * Copy the relevant range of the IO bitmap.
-		 * Normally this is 128 bytes or less:
-		 */
-		memcpy(tss->io_bitmap, next->io_bitmap_ptr,
-		       max(prev->io_bitmap_max, next->io_bitmap_max));
-	} else if (test_tsk_thread_flag(prev_p, TIF_IO_BITMAP)) {
-		/*
-		 * Clear any possible leftover bits:
-		 */
-		memset(tss->io_bitmap, 0xff, prev->io_bitmap_max);
-	}
-}
-
-/*
- *	switch_to(x,y) should switch tasks from x to y.
- *
- * This could still be optimized: 
- * - fold all the options into a flag word and test it with a single test.
- * - could test fs/gs bitsliced
- *
- * Kprobes not supported here. Set the probe on schedule instead.
- */
-__kprobes struct task_struct *
-__switch_to(struct task_struct *prev_p, struct task_struct *next_p)
-{
-	struct thread_struct *prev = &prev_p->thread,
-				 *next = &next_p->thread;
-	int cpu = smp_processor_id();  
-	struct tss_struct *tss = &per_cpu(init_tss, cpu);
-
-	/* we're going to use this soon, after a few expensive things */
-	if (next_p->fpu_counter>5)
-		prefetch(&next->i387.fxsave);
-
-	/*
-	 * Reload esp0, LDT and the page table pointer:
-	 */
-	tss->rsp0 = next->rsp0;
-
-	/* 
-	 * Switch DS and ES.
-	 * This won't pick up thread selector changes, but I guess that is ok.
-	 */
-	asm volatile("mov %%es,%0" : "=m" (prev->es));
-	if (unlikely(next->es | prev->es))
-		loadsegment(es, next->es); 
-	
-	asm volatile ("mov %%ds,%0" : "=m" (prev->ds));
-	if (unlikely(next->ds | prev->ds))
-		loadsegment(ds, next->ds);
-
-	load_TLS(next, cpu);
-
-	/* 
-	 * Switch FS and GS.
-	 */
-	{ 
-		unsigned fsindex;
-		asm volatile("movl %%fs,%0" : "=r" (fsindex)); 
-		/* segment register != 0 always requires a reload. 
-		   also reload when it has changed. 
-		   when prev process used 64bit base always reload
-		   to avoid an information leak. */
-		if (unlikely(fsindex | next->fsindex | prev->fs)) {
-			loadsegment(fs, next->fsindex);
-			/* check if the user used a selector != 0
-	                 * if yes clear 64bit base, since overloaded base
-                         * is always mapped to the Null selector
-                         */
-			if (fsindex)
-			prev->fs = 0;				
-		}
-		/* when next process has a 64bit base use it */
-		if (next->fs) 
-			wrmsrl(MSR_FS_BASE, next->fs); 
-		prev->fsindex = fsindex;
-	}
-	{ 
-		unsigned gsindex;
-		asm volatile("movl %%gs,%0" : "=r" (gsindex)); 
-		if (unlikely(gsindex | next->gsindex | prev->gs)) {
-			load_gs_index(next->gsindex);
-			if (gsindex)
-			prev->gs = 0;				
-		}
-		if (next->gs)
-			wrmsrl(MSR_KERNEL_GS_BASE, next->gs); 
-		prev->gsindex = gsindex;
-	}
-
-	/* Must be after DS reload */
-	unlazy_fpu(prev_p);
-
-	/* 
-	 * Switch the PDA and FPU contexts.
-	 */
-	prev->userrsp = read_pda(oldrsp); 
-	write_pda(oldrsp, next->userrsp); 
-	write_pda(pcurrent, next_p); 
-
-	write_pda(kernelstack,
-	(unsigned long)task_stack_page(next_p) + THREAD_SIZE - PDA_STACKOFFSET);
-#ifdef CONFIG_CC_STACKPROTECTOR
-	write_pda(stack_canary, next_p->stack_canary);
-	/*
-	 * Build time only check to make sure the stack_canary is at
-	 * offset 40 in the pda; this is a gcc ABI requirement
-	 */
-	BUILD_BUG_ON(offsetof(struct x8664_pda, stack_canary) != 40);
-#endif
-
-	/*
-	 * Now maybe reload the debug registers and handle I/O bitmaps
-	 */
-	if (unlikely((task_thread_info(next_p)->flags & _TIF_WORK_CTXSW))
-	    || test_tsk_thread_flag(prev_p, TIF_IO_BITMAP))
-		__switch_to_xtra(prev_p, next_p, tss);
-
-	/* If the task has used fpu the last 5 timeslices, just do a full
-	 * restore of the math state immediately to avoid the trap; the
-	 * chances of needing FPU soon are obviously high now
-	 */
-	if (next_p->fpu_counter>5)
-		math_state_restore();
-	return prev_p;
-}
-
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage 
-long sys_execve(char __user *name, char __user * __user *argv,
-		char __user * __user *envp, struct pt_regs regs)
-{
-	long error;
-	char * filename;
-
-	filename = getname(name);
-	error = PTR_ERR(filename);
-	if (IS_ERR(filename)) 
-		return error;
-	error = do_execve(filename, argv, envp, &regs); 
-	if (error == 0) {
-		task_lock(current);
-		current->ptrace &= ~PT_DTRACE;
-		task_unlock(current);
-	}
-	putname(filename);
-	return error;
-}
-
-void set_personality_64bit(void)
-{
-	/* inherit personality from parent */
-
-	/* Make sure to be in 64bit mode */
-	clear_thread_flag(TIF_IA32); 
-
-	/* TBD: overwrites user setup. Should have two bits.
-	   But 64bit processes have always behaved this way,
-	   so it's not too bad. The main problem is just that
-   	   32bit childs are affected again. */
-	current->personality &= ~READ_IMPLIES_EXEC;
-}
-
-asmlinkage long sys_fork(struct pt_regs *regs)
-{
-	return do_fork(SIGCHLD, regs->rsp, regs, 0, NULL, NULL);
-}
-
-asmlinkage long
-sys_clone(unsigned long clone_flags, unsigned long newsp,
-	  void __user *parent_tid, void __user *child_tid, struct pt_regs *regs)
-{
-	if (!newsp)
-		newsp = regs->rsp;
-	return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
-}
-
-/*
- * This is trivial, and on the face of it looks like it
- * could equally well be done in user mode.
- *
- * Not so, for quite unobvious reasons - register pressure.
- * In user mode vfork() cannot have a stack frame, and if
- * done by calling the "clone()" system call directly, you
- * do not have enough call-clobbered registers to hold all
- * the information you need.
- */
-asmlinkage long sys_vfork(struct pt_regs *regs)
-{
-	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->rsp, regs, 0,
-		    NULL, NULL);
-}
-
-unsigned long get_wchan(struct task_struct *p)
-{
-	unsigned long stack;
-	u64 fp,rip;
-	int count = 0;
-
-	if (!p || p == current || p->state==TASK_RUNNING)
-		return 0; 
-	stack = (unsigned long)task_stack_page(p);
-	if (p->thread.rsp < stack || p->thread.rsp > stack+THREAD_SIZE)
-		return 0;
-	fp = *(u64 *)(p->thread.rsp);
-	do { 
-		if (fp < (unsigned long)stack ||
-		    fp > (unsigned long)stack+THREAD_SIZE)
-			return 0; 
-		rip = *(u64 *)(fp+8); 
-		if (!in_sched_functions(rip))
-			return rip; 
-		fp = *(u64 *)fp; 
-	} while (count++ < 16); 
-	return 0;
-}
-
-long do_arch_prctl(struct task_struct *task, int code, unsigned long addr)
-{ 
-	int ret = 0; 
-	int doit = task == current;
-	int cpu;
-
-	switch (code) { 
-	case ARCH_SET_GS:
-		if (addr >= TASK_SIZE_OF(task))
-			return -EPERM; 
-		cpu = get_cpu();
-		/* handle small bases via the GDT because that's faster to 
-		   switch. */
-		if (addr <= 0xffffffff) {  
-			set_32bit_tls(task, GS_TLS, addr); 
-			if (doit) { 
-				load_TLS(&task->thread, cpu);
-				load_gs_index(GS_TLS_SEL); 
-			}
-			task->thread.gsindex = GS_TLS_SEL; 
-			task->thread.gs = 0;
-		} else { 
-			task->thread.gsindex = 0;
-			task->thread.gs = addr;
-			if (doit) {
-				load_gs_index(0);
-				ret = checking_wrmsrl(MSR_KERNEL_GS_BASE, addr);
-			} 
-		}
-		put_cpu();
-		break;
-	case ARCH_SET_FS:
-		/* Not strictly needed for fs, but do it for symmetry
-		   with gs */
-		if (addr >= TASK_SIZE_OF(task))
-			return -EPERM; 
-		cpu = get_cpu();
-		/* handle small bases via the GDT because that's faster to 
-		   switch. */
-		if (addr <= 0xffffffff) { 
-			set_32bit_tls(task, FS_TLS, addr);
-			if (doit) { 
-				load_TLS(&task->thread, cpu); 
-				asm volatile("movl %0,%%fs" :: "r"(FS_TLS_SEL));
-			}
-			task->thread.fsindex = FS_TLS_SEL;
-			task->thread.fs = 0;
-		} else { 
-			task->thread.fsindex = 0;
-			task->thread.fs = addr;
-			if (doit) {
-				/* set the selector to 0 to not confuse
-				   __switch_to */
-				asm volatile("movl %0,%%fs" :: "r" (0));
-				ret = checking_wrmsrl(MSR_FS_BASE, addr);
-			}
-		}
-		put_cpu();
-		break;
-	case ARCH_GET_FS: { 
-		unsigned long base; 
-		if (task->thread.fsindex == FS_TLS_SEL)
-			base = read_32bit_tls(task, FS_TLS);
-		else if (doit)
-			rdmsrl(MSR_FS_BASE, base);
-		else
-			base = task->thread.fs;
-		ret = put_user(base, (unsigned long __user *)addr); 
-		break; 
-	}
-	case ARCH_GET_GS: { 
-		unsigned long base;
-		unsigned gsindex;
-		if (task->thread.gsindex == GS_TLS_SEL)
-			base = read_32bit_tls(task, GS_TLS);
-		else if (doit) {
- 			asm("movl %%gs,%0" : "=r" (gsindex));
-			if (gsindex)
-				rdmsrl(MSR_KERNEL_GS_BASE, base);
-			else
-				base = task->thread.gs;
-		}
-		else
-			base = task->thread.gs;
-		ret = put_user(base, (unsigned long __user *)addr); 
-		break;
-	}
-
-	default:
-		ret = -EINVAL;
-		break;
-	} 
-
-	return ret;	
-} 
-
-long sys_arch_prctl(int code, unsigned long addr)
-{
-	return do_arch_prctl(current, code, addr);
-} 
-
-/* 
- * Capture the user space registers if the task is not running (in user space)
- */
-int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs)
-{
-	struct pt_regs *pp, ptregs;
-
-	pp = task_pt_regs(tsk);
-
-	ptregs = *pp; 
-	ptregs.cs &= 0xffff;
-	ptregs.ss &= 0xffff;
-
-	elf_core_copy_regs(regs, &ptregs);
- 
-	return 1;
-}
-
-unsigned long arch_align_stack(unsigned long sp)
-{
-	if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
-		sp -= get_random_int() % 8192;
-	return sp & ~0xf;
-}