LXR linux/arch/h8300/kernel/process.c

   1/*
   2 *  linux/arch/h8300/kernel/process.c
   3 *
   4 * Yoshinori Sato <ysato@users.sourceforge.jp>
   5 *
   6 *  Based on:
   7 *
   8 *  linux/arch/m68knommu/kernel/process.c
   9 *
  10 *  Copyright (C) 1998  D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
  11 *                      Kenneth Albanowski <kjahds@kjahds.com>,
  12 *                      The Silver Hammer Group, Ltd.
  13 *
  14 *  linux/arch/m68k/kernel/process.c
  15 *
  16 *  Copyright (C) 1995  Hamish Macdonald
  17 *
  18 *  68060 fixes by Jesper Skov
  19 */
  20
  21/*
  22 * This file handles the architecture-dependent parts of process handling..
  23 */
  24
  25#include <linux/errno.h>
  26#include <linux/module.h>
  27#include <linux/sched.h>
  28#include <linux/kernel.h>
  29#include <linux/mm.h>
  30#include <linux/smp.h>
  31#include <linux/stddef.h>
  32#include <linux/unistd.h>
  33#include <linux/ptrace.h>
  34#include <linux/user.h>
  35#include <linux/interrupt.h>
  36#include <linux/reboot.h>
  37#include <linux/fs.h>
  38#include <linux/slab.h>
  39#include <linux/rcupdate.h>
  40
  41#include <asm/uaccess.h>
  42#include <asm/traps.h>
  43#include <asm/setup.h>
  44#include <asm/pgtable.h>
  45
  46void (*pm_power_off)(void) = NULL;
  47EXPORT_SYMBOL(pm_power_off);
  48
  49asmlinkage void ret_from_fork(void);
  50asmlinkage void ret_from_kernel_thread(void);
  51
  52/*
  53 * The idle loop on an H8/300..
  54 */
  55void arch_cpu_idle(void)
  56{
  57        local_irq_enable();
  58        __asm__("sleep");
  59}
  60
  61void machine_restart(char *__unused)
  62{
  63        local_irq_disable();
  64        __asm__("jmp @@0");
  65}
  66
  67void machine_halt(void)
  68{
  69        local_irq_disable();
  70        __asm__("sleep");
  71        for (;;)
  72                ;
  73}
  74
  75void machine_power_off(void)
  76{
  77        local_irq_disable();
  78        __asm__("sleep");
  79        for (;;)
  80                ;
  81}
  82
  83void show_regs(struct pt_regs *regs)
  84{
  85        show_regs_print_info(KERN_DEFAULT);
  86
  87        pr_notice("\n");
  88        pr_notice("PC: %08lx  Status: %02x\n",
  89               regs->pc, regs->ccr);
  90        pr_notice("ORIG_ER0: %08lx ER0: %08lx ER1: %08lx\n",
  91               regs->orig_er0, regs->er0, regs->er1);
  92        pr_notice("ER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx\n",
  93               regs->er2, regs->er3, regs->er4, regs->er5);
  94        pr_notice("ER6' %08lx ", regs->er6);
  95        if (user_mode(regs))
  96                printk("USP: %08lx\n", rdusp());
  97        else
  98                printk("\n");
  99}
 100
 101void flush_thread(void)
 102{
 103}
 104
 105int copy_thread(unsigned long clone_flags,
 106                unsigned long usp, unsigned long topstk,
 107                struct task_struct *p)
 108{
 109        struct pt_regs *childregs;
 110
 111        childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
 112
 113        if (unlikely(p->flags & PF_KTHREAD)) {
 114                memset(childregs, 0, sizeof(struct pt_regs));
 115                childregs->retpc = (unsigned long) ret_from_kernel_thread;
 116                childregs->er4 = topstk; /* arg */
 117                childregs->er5 = usp; /* fn */
 118        }  else {
 119                *childregs = *current_pt_regs();
 120                childregs->er0 = 0;
 121                childregs->retpc = (unsigned long) ret_from_fork;
 122                p->thread.usp = usp ?: rdusp();
 123        }
 124        p->thread.ksp = (unsigned long)childregs;
 125
 126        return 0;
 127}
 128
 129unsigned long thread_saved_pc(struct task_struct *tsk)
 130{
 131        return ((struct pt_regs *)tsk->thread.esp0)->pc;
 132}
 133
 134unsigned long get_wchan(struct task_struct *p)
 135{
 136        unsigned long fp, pc;
 137        unsigned long stack_page;
 138        int count = 0;
 139
 140        if (!p || p == current || p->state == TASK_RUNNING)
 141                return 0;
 142
 143        stack_page = (unsigned long)p;
 144        fp = ((struct pt_regs *)p->thread.ksp)->er6;
 145        do {
 146                if (fp < stack_page+sizeof(struct thread_info) ||
 147                    fp >= 8184+stack_page)
 148                        return 0;
 149                pc = ((unsigned long *)fp)[1];
 150                if (!in_sched_functions(pc))
 151                        return pc;
 152                fp = *(unsigned long *) fp;
 153        } while (count++ < 16);
 154        return 0;
 155}
 156
 157/* generic sys_clone is not enough registers */
 158asmlinkage int sys_clone(unsigned long __user *args)
 159{
 160        unsigned long clone_flags;
 161        unsigned long  newsp;
 162        uintptr_t parent_tidptr;
 163        uintptr_t child_tidptr;
 164
 165        get_user(clone_flags, &args[0]);
 166        get_user(newsp, &args[1]);
 167        get_user(parent_tidptr, &args[2]);
 168        get_user(child_tidptr, &args[3]);
 169        return do_fork(clone_flags, newsp, 0,
 170                       (int __user *)parent_tidptr, (int __user *)child_tidptr);
 171}
 172