2 * linux/arch/h8300/kernel/process.c
4 * Yoshinori Sato <ysato@users.sourceforge.jp>
8 * linux/arch/m68knommu/kernel/process.c
10 * Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
11 * Kenneth Albanowski <kjahds@kjahds.com>,
12 * The Silver Hammer Group, Ltd.
14 * linux/arch/m68k/kernel/process.c
16 * Copyright (C) 1995 Hamish Macdonald
18 * 68060 fixes by Jesper Skov
22 * This file handles the architecture-dependent parts of process handling..
25 #include <linux/errno.h>
26 #include <linux/module.h>
27 #include <linux/sched.h>
28 #include <linux/kernel.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>
38 #include <linux/slab.h>
39 #include <linux/rcupdate.h>
41 #include <asm/uaccess.h>
42 #include <asm/traps.h>
43 #include <asm/setup.h>
44 #include <asm/pgtable.h>
46 void (*pm_power_off)(void) = NULL;
47 EXPORT_SYMBOL(pm_power_off);
49 asmlinkage void ret_from_fork(void);
50 asmlinkage void ret_from_kernel_thread(void);
53 * The idle loop on an H8/300..
55 void arch_cpu_idle(void)
61 void machine_restart(char *__unused)
67 void machine_halt(void)
75 void machine_power_off(void)
83 void show_regs(struct pt_regs *regs)
85 show_regs_print_info(KERN_DEFAULT);
88 pr_notice("PC: %08lx Status: %02x\n",
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);
96 printk("USP: %08lx\n", rdusp());
101 void flush_thread(void)
105 int copy_thread(unsigned long clone_flags,
106 unsigned long usp, unsigned long topstk,
107 struct task_struct *p)
109 struct pt_regs *childregs;
111 childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
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 */
119 *childregs = *current_pt_regs();
121 childregs->retpc = (unsigned long) ret_from_fork;
122 p->thread.usp = usp ?: rdusp();
124 p->thread.ksp = (unsigned long)childregs;
129 unsigned long thread_saved_pc(struct task_struct *tsk)
131 return ((struct pt_regs *)tsk->thread.esp0)->pc;
134 unsigned long get_wchan(struct task_struct *p)
136 unsigned long fp, pc;
137 unsigned long stack_page;
140 if (!p || p == current || p->state == TASK_RUNNING)
143 stack_page = (unsigned long)p;
144 fp = ((struct pt_regs *)p->thread.ksp)->er6;
146 if (fp < stack_page+sizeof(struct thread_info) ||
147 fp >= 8184+stack_page)
149 pc = ((unsigned long *)fp)[1];
150 if (!in_sched_functions(pc))
152 fp = *(unsigned long *) fp;
153 } while (count++ < 16);
157 /* generic sys_clone is not enough registers */
158 asmlinkage int sys_clone(unsigned long __user *args)
160 unsigned long clone_flags;
162 uintptr_t parent_tidptr;
163 uintptr_t child_tidptr;
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);