171 lines
3.7 KiB
C
171 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/h8300/kernel/process.c
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*
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* Yoshinori Sato <ysato@users.sourceforge.jp>
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*
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* Based on:
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*
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* linux/arch/m68knommu/kernel/process.c
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*
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* Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
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* Kenneth Albanowski <kjahds@kjahds.com>,
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* The Silver Hammer Group, Ltd.
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*
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* linux/arch/m68k/kernel/process.c
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*
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* Copyright (C) 1995 Hamish Macdonald
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*
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* 68060 fixes by Jesper Skov
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*/
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/*
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* This file handles the architecture-dependent parts of process handling..
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <linux/sched/task.h>
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#include <linux/sched/task_stack.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/user.h>
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#include <linux/interrupt.h>
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#include <linux/reboot.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/rcupdate.h>
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#include <linux/uaccess.h>
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#include <asm/traps.h>
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#include <asm/setup.h>
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#include <asm/pgtable.h>
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void (*pm_power_off)(void) = NULL;
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EXPORT_SYMBOL(pm_power_off);
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asmlinkage void ret_from_fork(void);
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asmlinkage void ret_from_kernel_thread(void);
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/*
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* The idle loop on an H8/300..
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*/
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void arch_cpu_idle(void)
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{
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local_irq_enable();
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__asm__("sleep");
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}
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void machine_restart(char *__unused)
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{
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local_irq_disable();
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__asm__("jmp @@0");
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}
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void machine_halt(void)
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{
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local_irq_disable();
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__asm__("sleep");
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for (;;)
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;
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}
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void machine_power_off(void)
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{
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local_irq_disable();
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__asm__("sleep");
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for (;;)
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;
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}
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void show_regs(struct pt_regs *regs)
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{
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show_regs_print_info(KERN_DEFAULT);
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pr_notice("\n");
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pr_notice("PC: %08lx Status: %02x\n",
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regs->pc, regs->ccr);
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pr_notice("ORIG_ER0: %08lx ER0: %08lx ER1: %08lx\n",
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regs->orig_er0, regs->er0, regs->er1);
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pr_notice("ER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx\n",
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regs->er2, regs->er3, regs->er4, regs->er5);
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pr_notice("ER6' %08lx ", regs->er6);
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if (user_mode(regs))
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printk("USP: %08lx\n", rdusp());
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else
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printk("\n");
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}
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void flush_thread(void)
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{
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}
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int copy_thread(unsigned long clone_flags,
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unsigned long usp, unsigned long topstk,
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struct task_struct *p)
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{
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struct pt_regs *childregs;
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childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
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if (unlikely(p->flags & PF_KTHREAD)) {
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memset(childregs, 0, sizeof(struct pt_regs));
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childregs->retpc = (unsigned long) ret_from_kernel_thread;
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childregs->er4 = topstk; /* arg */
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childregs->er5 = usp; /* fn */
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} else {
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*childregs = *current_pt_regs();
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childregs->er0 = 0;
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childregs->retpc = (unsigned long) ret_from_fork;
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p->thread.usp = usp ?: rdusp();
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}
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p->thread.ksp = (unsigned long)childregs;
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return 0;
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}
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unsigned long get_wchan(struct task_struct *p)
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{
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unsigned long fp, pc;
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unsigned long stack_page;
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int count = 0;
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if (!p || p == current || p->state == TASK_RUNNING)
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return 0;
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stack_page = (unsigned long)p;
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fp = ((struct pt_regs *)p->thread.ksp)->er6;
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do {
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if (fp < stack_page+sizeof(struct thread_info) ||
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fp >= 8184+stack_page)
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return 0;
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pc = ((unsigned long *)fp)[1];
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if (!in_sched_functions(pc))
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return pc;
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fp = *(unsigned long *) fp;
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} while (count++ < 16);
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return 0;
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}
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/* generic sys_clone is not enough registers */
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asmlinkage int sys_clone(unsigned long __user *args)
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{
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unsigned long clone_flags;
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unsigned long newsp;
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uintptr_t parent_tidptr;
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uintptr_t child_tidptr;
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get_user(clone_flags, &args[0]);
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get_user(newsp, &args[1]);
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get_user(parent_tidptr, &args[2]);
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get_user(child_tidptr, &args[3]);
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return do_fork(clone_flags, newsp, 0,
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(int __user *)parent_tidptr, (int __user *)child_tidptr);
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}
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