171 lines
3.7 KiB
C
171 lines
3.7 KiB
C
/*
|
|
* 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/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 <asm/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 thread_saved_pc(struct task_struct *tsk)
|
|
{
|
|
return ((struct pt_regs *)tsk->thread.esp0)->pc;
|
|
}
|
|
|
|
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);
|
|
}
|