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// SPDX-License-Identifier: GPL-2.0
/*
* 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/sched/debug.h>
#include <linux/sched/task.h>
#include <linux/sched/task_stack.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 <linux/uaccess.h>
#include <asm/traps.h>
#include <asm/setup.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, unsigned long tls)
{
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 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;
struct kernel_clone_args kargs = {};
get_user(clone_flags, &args[0]);
get_user(newsp, &args[1]);
get_user(parent_tidptr, &args[2]);
get_user(child_tidptr, &args[3]);
kargs.flags = (lower_32_bits(clone_flags) & ~CSIGNAL);
kargs.pidfd = (int __user *)parent_tidptr;
kargs.child_tid = (int __user *)child_tidptr;
kargs.parent_tid = (int __user *)parent_tidptr;
kargs.exit_signal = (lower_32_bits(clone_flags) & CSIGNAL);
kargs.stack = newsp;
return _do_fork(&kargs);
}
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