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Linux/arch/h8300/kernel/process.c

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  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 
 46 void (*pm_power_off)(void) = NULL;
 47 EXPORT_SYMBOL(pm_power_off);
 48 
 49 asmlinkage void ret_from_fork(void);
 50 asmlinkage void ret_from_kernel_thread(void);
 51 
 52 /*
 53  * The idle loop on an H8/300..
 54  */
 55 void arch_cpu_idle(void)
 56 {
 57         local_irq_enable();
 58         __asm__("sleep");
 59 }
 60 
 61 void machine_restart(char *__unused)
 62 {
 63         local_irq_disable();
 64         __asm__("jmp @@0");
 65 }
 66 
 67 void machine_halt(void)
 68 {
 69         local_irq_disable();
 70         __asm__("sleep");
 71         for (;;)
 72                 ;
 73 }
 74 
 75 void machine_power_off(void)
 76 {
 77         local_irq_disable();
 78         __asm__("sleep");
 79         for (;;)
 80                 ;
 81 }
 82 
 83 void 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 
101 void flush_thread(void)
102 {
103 }
104 
105 int 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 
129 unsigned long thread_saved_pc(struct task_struct *tsk)
130 {
131         return ((struct pt_regs *)tsk->thread.esp0)->pc;
132 }
133 
134 unsigned 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 */
158 asmlinkage 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 

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