text: /*
   *  linux/arch/h8300/kernel/process.c
   *
   * Yoshinori Sato <ysato@users.sourceforge.jp>
   *
   *  Based on:
   *
   *  linux/arch/m68knommu/kernel/process.c
   *
   *  Copyright (C) 1998  D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
   *                      Kenneth Albanowski <kjahds@kjahds.com>,
   *                      The Silver Hammer Group, Ltd.
   *
   *  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/errno.h>
  #include <linux/module.h>
  #include <linux/sched.h>
  #include <linux/sched/debug.h>
  #include <linux/sched/task.h>
  #include <linux/sched/task_stack.h>
  #include <linux/kernel.h>
  #include <linux/mm.h>
  #include <linux/smp.h>
  #include <linux/stddef.h>
  #include <linux/unistd.h>
  #include <linux/ptrace.h>
  #include <linux/user.h>
  #include <linux/interrupt.h>
  #include <linux/reboot.h>
  #include <linux/fs.h>
  #include <linux/slab.h>
  #include <linux/rcupdate.h>
  
  #include <linux/uaccess.h>
  #include <asm/traps.h>
  #include <asm/setup.h>
  #include <asm/pgtable.h>
  
  void (*pm_power_off)(void) = NULL;
  EXPORT_SYMBOL(pm_power_off);
  
  asmlinkage void ret_from_fork(void);
  asmlinkage void ret_from_kernel_thread(void);
  
  /*
   * The idle loop on an H8/300..
   */
  void arch_cpu_idle(void)
  {
  	local_irq_enable();
  	__asm__("sleep");
  }
  
  void machine_restart(char *__unused)
  {
  	local_irq_disable();
  	__asm__("jmp @@0");
  }
  
  void machine_halt(void)
  {
  	local_irq_disable();
  	__asm__("sleep");
  	for (;;)
  		;
  }
  
  void machine_power_off(void)
  {
  	local_irq_disable();
  	__asm__("sleep");
  	for (;;)
  		;
  }
  
  void show_regs(struct pt_regs *regs)
  {
  	show_regs_print_info(KERN_DEFAULT);
  
  	pr_notice("\n");
  	pr_notice("PC: %08lx  Status: %02x\n",
  	       regs->pc, regs->ccr);
  	pr_notice("ORIG_ER0: %08lx ER0: %08lx ER1: %08lx\n",
  	       regs->orig_er0, regs->er0, regs->er1);
  	pr_notice("ER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx\n",
  	       regs->er2, regs->er3, regs->er4, regs->er5);
  	pr_notice("ER6' %08lx ", regs->er6);
  	if (user_mode(regs))
  		printk("USP: %08lx\n", rdusp());
  	else
  		printk("\n");
  }
  
  void flush_thread(void)
  {
  }
  
  int copy_thread(unsigned long clone_flags,
  		unsigned long usp, unsigned long topstk,
  		struct task_struct *p)
  {
  	struct pt_regs *childregs;
  
  	childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
  
  	if (unlikely(p->flags & PF_KTHREAD)) {
  		memset(childregs, 0, sizeof(struct pt_regs));
  		childregs->retpc = (unsigned long) ret_from_kernel_thread;
  		childregs->er4 = topstk; /* arg */
  		childregs->er5 = usp; /* fn */
  	}  else {
  		*childregs = *current_pt_regs();
  		childregs->er0 = 0;
  		childregs->retpc = (unsigned long) ret_from_fork;
  		p->thread.usp = usp ?: rdusp();
  	}
  	p->thread.ksp = (unsigned long)childregs;
  
  	return 0;
  }
  
  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;
  	fp = ((struct pt_regs *)p->thread.ksp)->er6;
  	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;
  }
  
  /* generic sys_clone is not enough registers */
  asmlinkage int sys_clone(unsigned long __user *args)
  {
  	unsigned long clone_flags;
  	unsigned long  newsp;
  	uintptr_t parent_tidptr;
  	uintptr_t child_tidptr;
  
  	get_user(clone_flags, &args[0]);
  	get_user(newsp, &args[1]);
  	get_user(parent_tidptr, &args[2]);
  	get_user(child_tidptr, &args[3]);
  	return do_fork(clone_flags, newsp, 0,
  		       (int __user *)parent_tidptr, (int __user *)child_tidptr);
  }
  