arch/m68k/kernel/process.c - linux/kernel/git/klassert/ipsec - Git at Google

 /*
  *  linux/arch/m68k/kernel/process.c
  *
  *  Copyright (C) 1995  Hamish Macdonald
  *
  *  68060 fixes by Jesper Skov
  */

 /*
  * This file handles the architecture-dependent parts of process handling..
  */

 #include <linux/config.h>
 #include <linux/errno.h>
 #include <linux/module.h>
 #include <linux/sched.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/smp.h>
 #include <linux/smp_lock.h>
 #include <linux/stddef.h>
 #include <linux/unistd.h>
 #include <linux/ptrace.h>
 #include <linux/slab.h>
 #include <linux/user.h>
 #include <linux/a.out.h>
 #include <linux/reboot.h>
 #include <linux/init_task.h>
 #include <linux/mqueue.h>

 #include <asm/uaccess.h>
 #include <asm/system.h>
 #include <asm/traps.h>
 #include <asm/machdep.h>
 #include <asm/setup.h>
 #include <asm/pgtable.h>

 /*
  * Initial task/thread structure. Make this a per-architecture thing,
  * because different architectures tend to have different
  * alignment requirements and potentially different initial
  * setup.
  */
 static struct fs_struct init_fs = INIT_FS;
 static struct files_struct init_files = INIT_FILES;
 static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
 static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
 struct mm_struct init_mm = INIT_MM(init_mm);

 EXPORT_SYMBOL(init_mm);

 union thread_union init_thread_union
 __attribute__((section(".data.init_task"), aligned(THREAD_SIZE)))
        = { INIT_THREAD_INFO(init_task) };

 /* initial task structure */
 struct task_struct init_task = INIT_TASK(init_task);

 EXPORT_SYMBOL(init_task);

 asmlinkage void ret_from_fork(void);


 /*
  * Return saved PC from a blocked thread
  */
 unsigned long thread_saved_pc(struct task_struct *tsk)
 {
 	struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
 	/* Check whether the thread is blocked in resume() */
 	if (in_sched_functions(sw->retpc))
 		return ((unsigned long *)sw->a6)[1];
 	else
 		return sw->retpc;
 }

 /*
  * The idle loop on an m68k..
  */
 void default_idle(void)
 {
 	if (!need_resched())
 #if defined(MACH_ATARI_ONLY) && !defined(CONFIG_HADES)
 		/* block out HSYNC on the atari (falcon) */
 		__asm__("stop #0x2200" : : : "cc");
 #else
 		__asm__("stop #0x2000" : : : "cc");
 #endif
 }

 void (*idle)(void) = default_idle;

 /*
  * 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)
 {
 	/* endless idle loop with no priority at all */
 	while (1) {
 		while (!need_resched())
 			idle();
 		schedule();
 	}
 }

 void machine_restart(char * __unused)
 {
 	if (mach_reset)
 		mach_reset();
 	for (;;);
 }

 EXPORT_SYMBOL(machine_restart);

 void machine_halt(void)
 {
 	if (mach_halt)
 		mach_halt();
 	for (;;);
 }

 EXPORT_SYMBOL(machine_halt);

 void machine_power_off(void)
 {
 	if (mach_power_off)
 		mach_power_off();
 	for (;;);
 }

 EXPORT_SYMBOL(machine_power_off);

 void show_regs(struct pt_regs * regs)
 {
 	printk("\n");
 	printk("Format %02x  Vector: %04x  PC: %08lx  Status: %04x    %s\n",
 	       regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
 	printk("ORIG_D0: %08lx  D0: %08lx  A2: %08lx  A1: %08lx\n",
 	       regs->orig_d0, regs->d0, regs->a2, regs->a1);
 	printk("A0: %08lx  D5: %08lx  D4: %08lx\n",
 	       regs->a0, regs->d5, regs->d4);
 	printk("D3: %08lx  D2: %08lx  D1: %08lx\n",
 	       regs->d3, regs->d2, regs->d1);
 	if (!(regs->sr & PS_S))
 		printk("USP: %08lx\n", rdusp());
 }

 /*
  * Create a kernel thread
  */
 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
 {
 	int pid;
 	mm_segment_t fs;

 	fs = get_fs();
 	set_fs (KERNEL_DS);

 	{
 	register long retval __asm__ ("d0");
 	register long clone_arg __asm__ ("d1") = flags | CLONE_VM | CLONE_UNTRACED;

 	retval = __NR_clone;
 	__asm__ __volatile__
 	  ("clrl %%d2\n\t"
 	   "trap #0\n\t"		/* Linux/m68k system call */
 	   "tstl %0\n\t"		/* child or parent */
 	   "jne 1f\n\t"			/* parent - jump */
 	   "lea %%sp@(%c7),%6\n\t"	/* reload current */
 	   "movel %6@,%6\n\t"
 	   "movel %3,%%sp@-\n\t"	/* push argument */
 	   "jsr %4@\n\t"		/* call fn */
 	   "movel %0,%%d1\n\t"		/* pass exit value */
 	   "movel %2,%%d0\n\t"		/* exit */
 	   "trap #0\n"
 	   "1:"
 	   : "+d" (retval)
 	   : "i" (__NR_clone), "i" (__NR_exit),
 	     "r" (arg), "a" (fn), "d" (clone_arg), "r" (current),
 	     "i" (-THREAD_SIZE)
 	   : "d2");

 	pid = retval;
 	}

 	set_fs (fs);
 	return pid;
 }

 void flush_thread(void)
 {
 	unsigned long zero = 0;
 	set_fs(USER_DS);
 	current->thread.fs = __USER_DS;
 	if (!FPU_IS_EMU)
 		asm volatile (".chip 68k/68881\n\t"
 			      "frestore %0@\n\t"
 			      ".chip 68k" : : "a" (&zero));
 }

 /*
  * "m68k_fork()".. By the time we get here, the
  * non-volatile registers have also been saved on the
  * stack. We do some ugly pointer stuff here.. (see
  * also copy_thread)
  */

 asmlinkage int m68k_fork(struct pt_regs *regs)
 {
 	return do_fork(SIGCHLD, rdusp(), regs, 0, NULL, NULL);
 }

 asmlinkage int m68k_vfork(struct pt_regs *regs)
 {
 	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0,
 		       NULL, NULL);
 }

 asmlinkage int m68k_clone(struct pt_regs *regs)
 {
 	unsigned long clone_flags;
 	unsigned long newsp;
 	int *parent_tidptr, *child_tidptr;

 	/* syscall2 puts clone_flags in d1 and usp in d2 */
 	clone_flags = regs->d1;
 	newsp = regs->d2;
 	parent_tidptr = (int *)regs->d3;
 	child_tidptr = (int *)regs->d4;
 	if (!newsp)
 		newsp = rdusp();
 	return do_fork(clone_flags, newsp, regs, 0,
 		       parent_tidptr, child_tidptr);
 }

 int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 		 unsigned long unused,
 		 struct task_struct * p, struct pt_regs * regs)
 {
 	struct pt_regs * childregs;
 	struct switch_stack * childstack, *stack;
 	unsigned long stack_offset, *retp;

 	stack_offset = THREAD_SIZE - sizeof(struct pt_regs);
 	childregs = (struct pt_regs *) ((unsigned long) (p->thread_info) + stack_offset);

 	*childregs = *regs;
 	childregs->d0 = 0;

 	retp = ((unsigned long *) regs);
 	stack = ((struct switch_stack *) retp) - 1;

 	childstack = ((struct switch_stack *) childregs) - 1;
 	*childstack = *stack;
 	childstack->retpc = (unsigned long)ret_from_fork;

 	p->thread.usp = usp;
 	p->thread.ksp = (unsigned long)childstack;
 	/*
 	 * Must save the current SFC/DFC value, NOT the value when
 	 * the parent was last descheduled - RGH  10-08-96
 	 */
 	p->thread.fs = get_fs().seg;

 	if (!FPU_IS_EMU) {
 		/* Copy the current fpu state */
 		asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");

 		if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2])
 		  asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
 				"fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
 				: : "m" (p->thread.fp[0]), "m" (p->thread.fpcntl[0])
 				: "memory");
 		/* Restore the state in case the fpu was busy */
 		asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
 	}

 	return 0;
 }

 /* Fill in the fpu structure for a core dump.  */

 int dump_fpu (struct pt_regs *regs, struct user_m68kfp_struct *fpu)
 {
 	char fpustate[216];

 	if (FPU_IS_EMU) {
 		int i;

 		memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
 		memcpy(fpu->fpregs, current->thread.fp, 96);
 		/* Convert internal fpu reg representation
 		 * into long double format
 		 */
 		for (i = 0; i < 24; i += 3)
 			fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
 			                 ((fpu->fpregs[i] & 0x0000ffff) << 16);
 		return 1;
 	}

 	/* First dump the fpu context to avoid protocol violation.  */
 	asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
 	if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
 		return 0;

 	asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
 		:: "m" (fpu->fpcntl[0])
 		: "memory");
 	asm volatile ("fmovemx %/fp0-%/fp7,%0"
 		:: "m" (fpu->fpregs[0])
 		: "memory");
 	return 1;
 }

 /*
  * fill in the user structure for a core dump..
  */
 void dump_thread(struct pt_regs * regs, struct user * dump)
 {
 	struct switch_stack *sw;

 /* changed the size calculations - should hopefully work better. lbt */
 	dump->magic = CMAGIC;
 	dump->start_code = 0;
 	dump->start_stack = rdusp() & ~(PAGE_SIZE - 1);
 	dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
 	dump->u_dsize = ((unsigned long) (current->mm->brk +
 					  (PAGE_SIZE-1))) >> PAGE_SHIFT;
 	dump->u_dsize -= dump->u_tsize;
 	dump->u_ssize = 0;

 	if (dump->start_stack < TASK_SIZE)
 		dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT;

 	dump->u_ar0 = (struct user_regs_struct *)((int)&dump->regs - (int)dump);
 	sw = ((struct switch_stack *)regs) - 1;
 	dump->regs.d1 = regs->d1;
 	dump->regs.d2 = regs->d2;
 	dump->regs.d3 = regs->d3;
 	dump->regs.d4 = regs->d4;
 	dump->regs.d5 = regs->d5;
 	dump->regs.d6 = sw->d6;
 	dump->regs.d7 = sw->d7;
 	dump->regs.a0 = regs->a0;
 	dump->regs.a1 = regs->a1;
 	dump->regs.a2 = regs->a2;
 	dump->regs.a3 = sw->a3;
 	dump->regs.a4 = sw->a4;
 	dump->regs.a5 = sw->a5;
 	dump->regs.a6 = sw->a6;
 	dump->regs.d0 = regs->d0;
 	dump->regs.orig_d0 = regs->orig_d0;
 	dump->regs.stkadj = regs->stkadj;
 	dump->regs.sr = regs->sr;
 	dump->regs.pc = regs->pc;
 	dump->regs.fmtvec = (regs->format << 12) | regs->vector;
 	/* dump floating point stuff */
 	dump->u_fpvalid = dump_fpu (regs, &dump->m68kfp);
 }

 /*
  * sys_execve() executes a new program.
  */
 asmlinkage int sys_execve(char *name, char **argv, char **envp)
 {
 	int error;
 	char * filename;
 	struct pt_regs *regs = (struct pt_regs *) &name;

 	lock_kernel();
 	filename = getname(name);
 	error = PTR_ERR(filename);
 	if (IS_ERR(filename))
 		goto out;
 	error = do_execve(filename, argv, envp, regs);
 	putname(filename);
 out:
 	unlock_kernel();
 	return error;
 }

 unsigned long get_wchan(struct task_struct *p)
 {
 	unsigned long fp, pc;
 	unsigned long stack_page;
 	int count = 0;
 	if (!p || p == current || p->state == TASK_RUNNING)
 		return 0;

 	stack_page = (unsigned long)(p->thread_info);
 	fp = ((struct switch_stack *)p->thread.ksp)->a6;
 	do {
 		if (fp < stack_page+sizeof(struct thread_info) ||
 		    fp >= 8184+stack_page)
 			return 0;
 		pc = ((unsigned long *)fp)[1];
 		if (!in_sched_functions(pc))
 			return pc;
 		fp = *(unsigned long *) fp;
 	} while (count++ < 16);
 	return 0;
 }
	/*
	* linux/arch/m68k/kernel/process.c
	*
	* Copyright (C) 1995 Hamish Macdonald
	*
	* 68060 fixes by Jesper Skov
	*/

	/*
	* This file handles the architecture-dependent parts of process handling..
	*/

	#include <linux/config.h>
	#include <linux/errno.h>
	#include <linux/module.h>
	#include <linux/sched.h>
	#include <linux/kernel.h>
	#include <linux/mm.h>
	#include <linux/smp.h>
	#include <linux/smp_lock.h>
	#include <linux/stddef.h>
	#include <linux/unistd.h>
	#include <linux/ptrace.h>
	#include <linux/slab.h>
	#include <linux/user.h>
	#include <linux/a.out.h>
	#include <linux/reboot.h>
	#include <linux/init_task.h>
	#include <linux/mqueue.h>

	#include <asm/uaccess.h>
	#include <asm/system.h>
	#include <asm/traps.h>
	#include <asm/machdep.h>
	#include <asm/setup.h>
	#include <asm/pgtable.h>

	/*
	* Initial task/thread structure. Make this a per-architecture thing,
	* because different architectures tend to have different
	* alignment requirements and potentially different initial
	* setup.
	*/
	static struct fs_struct init_fs = INIT_FS;
	static struct files_struct init_files = INIT_FILES;
	static struct signal_struct init_signals = INIT_SIGNALS(init_signals);
	static struct sighand_struct init_sighand = INIT_SIGHAND(init_sighand);
	struct mm_struct init_mm = INIT_MM(init_mm);

	EXPORT_SYMBOL(init_mm);

	union thread_union init_thread_union
	__attribute__((section(".data.init_task"), aligned(THREAD_SIZE)))
	= { INIT_THREAD_INFO(init_task) };

	/* initial task structure */
	struct task_struct init_task = INIT_TASK(init_task);

	EXPORT_SYMBOL(init_task);

	asmlinkage void ret_from_fork(void);


	/*
	* Return saved PC from a blocked thread
	*/
	unsigned long thread_saved_pc(struct task_struct *tsk)
	{
	struct switch_stack sw = (struct switch_stack )tsk->thread.ksp;
	/* Check whether the thread is blocked in resume() */
	if (in_sched_functions(sw->retpc))
	return ((unsigned long *)sw->a6)[1];
	else
	return sw->retpc;
	}

	/*
	* The idle loop on an m68k..
	*/
	void default_idle(void)
	{
	if (!need_resched())
	#if defined(MACH_ATARI_ONLY) && !defined(CONFIG_HADES)
	/* block out HSYNC on the atari (falcon) */
	__asm__("stop #0x2200" : : : "cc");
	#else
	__asm__("stop #0x2000" : : : "cc");
	#endif
	}

	void (*idle)(void) = default_idle;

	/*
	* 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)
	{
	/* endless idle loop with no priority at all */
	while (1) {
	while (!need_resched())
	idle();
	schedule();
	}
	}

	void machine_restart(char * __unused)
	{
	if (mach_reset)
	mach_reset();
	for (;;);
	}

	EXPORT_SYMBOL(machine_restart);

	void machine_halt(void)
	{
	if (mach_halt)
	mach_halt();
	for (;;);
	}

	EXPORT_SYMBOL(machine_halt);

	void machine_power_off(void)
	{
	if (mach_power_off)
	mach_power_off();
	for (;;);
	}

	EXPORT_SYMBOL(machine_power_off);

	void show_regs(struct pt_regs * regs)
	{
	printk("\n");
	printk("Format %02x Vector: %04x PC: %08lx Status: %04x %s\n",
	regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
	printk("ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n",
	regs->orig_d0, regs->d0, regs->a2, regs->a1);
	printk("A0: %08lx D5: %08lx D4: %08lx\n",
	regs->a0, regs->d5, regs->d4);
	printk("D3: %08lx D2: %08lx D1: %08lx\n",
	regs->d3, regs->d2, regs->d1);
	if (!(regs->sr & PS_S))
	printk("USP: %08lx\n", rdusp());
	}

	/*
	* Create a kernel thread
	*/
	int kernel_thread(int (fn)(void ), void * arg, unsigned long flags)
	{
	int pid;
	mm_segment_t fs;

	fs = get_fs();
	set_fs (KERNEL_DS);

	{
	register long retval __asm__ ("d0");
	register long clone_arg __asm__ ("d1") = flags \| CLONE_VM \| CLONE_UNTRACED;

	retval = __NR_clone;
	__asm__ __volatile__
	("clrl %%d2\n\t"
	"trap #0\n\t" /* Linux/m68k system call */
	"tstl %0\n\t" /* child or parent */
	"jne 1f\n\t" /* parent - jump */
	"lea %%sp@(%c7),%6\n\t" /* reload current */
	"movel %6@,%6\n\t"
	"movel %3,%%sp@-\n\t" /* push argument */
	"jsr %4@\n\t" /* call fn */
	"movel %0,%%d1\n\t" /* pass exit value */
	"movel %2,%%d0\n\t" /* exit */
	"trap #0\n"
	"1:"
	: "+d" (retval)
	: "i" (__NR_clone), "i" (__NR_exit),
	"r" (arg), "a" (fn), "d" (clone_arg), "r" (current),
	"i" (-THREAD_SIZE)
	: "d2");

	pid = retval;
	}

	set_fs (fs);
	return pid;
	}

	void flush_thread(void)
	{
	unsigned long zero = 0;
	set_fs(USER_DS);
	current->thread.fs = __USER_DS;
	if (!FPU_IS_EMU)
	asm volatile (".chip 68k/68881\n\t"
	"frestore %0@\n\t"
	".chip 68k" : : "a" (&zero));
	}

	/*
	* "m68k_fork()".. By the time we get here, the
	* non-volatile registers have also been saved on the
	* stack. We do some ugly pointer stuff here.. (see
	* also copy_thread)
	*/

	asmlinkage int m68k_fork(struct pt_regs *regs)
	{
	return do_fork(SIGCHLD, rdusp(), regs, 0, NULL, NULL);
	}

	asmlinkage int m68k_vfork(struct pt_regs *regs)
	{
	return do_fork(CLONE_VFORK \| CLONE_VM \| SIGCHLD, rdusp(), regs, 0,
	NULL, NULL);
	}

	asmlinkage int m68k_clone(struct pt_regs *regs)
	{
	unsigned long clone_flags;
	unsigned long newsp;
	int parent_tidptr, child_tidptr;

	/* syscall2 puts clone_flags in d1 and usp in d2 */
	clone_flags = regs->d1;
	newsp = regs->d2;
	parent_tidptr = (int *)regs->d3;
	child_tidptr = (int *)regs->d4;
	if (!newsp)
	newsp = rdusp();
	return do_fork(clone_flags, newsp, regs, 0,
	parent_tidptr, child_tidptr);
	}

	int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
	unsigned long unused,
	struct task_struct * p, struct pt_regs * regs)
	{
	struct pt_regs * childregs;
	struct switch_stack * childstack, *stack;
	unsigned long stack_offset, *retp;

	stack_offset = THREAD_SIZE - sizeof(struct pt_regs);
	childregs = (struct pt_regs *) ((unsigned long) (p->thread_info) + stack_offset);

	childregs = regs;
	childregs->d0 = 0;

	retp = ((unsigned long *) regs);
	stack = ((struct switch_stack *) retp) - 1;

	childstack = ((struct switch_stack *) childregs) - 1;
	childstack = stack;
	childstack->retpc = (unsigned long)ret_from_fork;

	p->thread.usp = usp;
	p->thread.ksp = (unsigned long)childstack;
	/*
	* Must save the current SFC/DFC value, NOT the value when
	* the parent was last descheduled - RGH 10-08-96
	*/
	p->thread.fs = get_fs().seg;

	if (!FPU_IS_EMU) {
	/* Copy the current fpu state */
	asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");

	if (!CPU_IS_060 ? p->thread.fpstate[0] : p->thread.fpstate[2])
	asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
	"fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
	: : "m" (p->thread.fp[0]), "m" (p->thread.fpcntl[0])
	: "memory");
	/* Restore the state in case the fpu was busy */
	asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
	}

	return 0;
	}

	/* Fill in the fpu structure for a core dump. */

	int dump_fpu (struct pt_regs regs, struct user_m68kfp_struct fpu)
	{
	char fpustate[216];

	if (FPU_IS_EMU) {
	int i;

	memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
	memcpy(fpu->fpregs, current->thread.fp, 96);
	/* Convert internal fpu reg representation
	* into long double format
	*/
	for (i = 0; i < 24; i += 3)
	fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) \|
	((fpu->fpregs[i] & 0x0000ffff) << 16);
	return 1;
	}

	/* First dump the fpu context to avoid protocol violation. */
	asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
	if (!CPU_IS_060 ? !fpustate[0] : !fpustate[2])
	return 0;

	asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
	:: "m" (fpu->fpcntl[0])
	: "memory");
	asm volatile ("fmovemx %/fp0-%/fp7,%0"
	:: "m" (fpu->fpregs[0])
	: "memory");
	return 1;
	}

	/*
	* fill in the user structure for a core dump..
	*/
	void dump_thread(struct pt_regs * regs, struct user * dump)
	{
	struct switch_stack *sw;

	/* changed the size calculations - should hopefully work better. lbt */
	dump->magic = CMAGIC;
	dump->start_code = 0;
	dump->start_stack = rdusp() & ~(PAGE_SIZE - 1);
	dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
	dump->u_dsize = ((unsigned long) (current->mm->brk +
	(PAGE_SIZE-1))) >> PAGE_SHIFT;
	dump->u_dsize -= dump->u_tsize;
	dump->u_ssize = 0;

	if (dump->start_stack < TASK_SIZE)
	dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT;

	dump->u_ar0 = (struct user_regs_struct *)((int)&dump->regs - (int)dump);
	sw = ((struct switch_stack *)regs) - 1;
	dump->regs.d1 = regs->d1;
	dump->regs.d2 = regs->d2;
	dump->regs.d3 = regs->d3;
	dump->regs.d4 = regs->d4;
	dump->regs.d5 = regs->d5;
	dump->regs.d6 = sw->d6;
	dump->regs.d7 = sw->d7;
	dump->regs.a0 = regs->a0;
	dump->regs.a1 = regs->a1;
	dump->regs.a2 = regs->a2;
	dump->regs.a3 = sw->a3;
	dump->regs.a4 = sw->a4;
	dump->regs.a5 = sw->a5;
	dump->regs.a6 = sw->a6;
	dump->regs.d0 = regs->d0;
	dump->regs.orig_d0 = regs->orig_d0;
	dump->regs.stkadj = regs->stkadj;
	dump->regs.sr = regs->sr;
	dump->regs.pc = regs->pc;
	dump->regs.fmtvec = (regs->format << 12) \| regs->vector;
	/* dump floating point stuff */
	dump->u_fpvalid = dump_fpu (regs, &dump->m68kfp);
	}

	/*
	* sys_execve() executes a new program.
	*/
	asmlinkage int sys_execve(char name, char argv, char *envp)
	{
	int error;
	char * filename;
	struct pt_regs regs = (struct pt_regs ) &name;

	lock_kernel();
	filename = getname(name);
	error = PTR_ERR(filename);
	if (IS_ERR(filename))
	goto out;
	error = do_execve(filename, argv, envp, regs);
	putname(filename);
	out:
	unlock_kernel();
	return error;
	}

	unsigned long get_wchan(struct task_struct *p)
	{
	unsigned long fp, pc;
	unsigned long stack_page;
	int count = 0;
	if (!p \|\| p == current \|\| p->state == TASK_RUNNING)
	return 0;

	stack_page = (unsigned long)(p->thread_info);
	fp = ((struct switch_stack *)p->thread.ksp)->a6;
	do {
	if (fp < stack_page+sizeof(struct thread_info) \|\|
	fp >= 8184+stack_page)
	return 0;
	pc = ((unsigned long *)fp)[1];
	if (!in_sched_functions(pc))
	return pc;
	fp = (unsigned long ) fp;
	} while (count++ < 16);
	return 0;
	}