1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/h8300/kernel/process.c
9 * linux/arch/m68knommu/kernel/process.c
13 * The Silver Hammer Group, Ltd.
15 * linux/arch/m68k/kernel/process.c
17 * Copyright (C) 1995 Hamish Macdonald
19 * 68060 fixes by Jesper Skov
23 * This file handles the architecture-dependent parts of process handling..
26 #include <linux/errno.h>
27 #include <linux/module.h>
28 #include <linux/sched.h>
29 #include <linux/sched/debug.h>
30 #include <linux/sched/task.h>
31 #include <linux/sched/task_stack.h>
32 #include <linux/kernel.h>
34 #include <linux/smp.h>
35 #include <linux/stddef.h>
36 #include <linux/unistd.h>
37 #include <linux/ptrace.h>
38 #include <linux/user.h>
39 #include <linux/interrupt.h>
40 #include <linux/reboot.h>
42 #include <linux/slab.h>
43 #include <linux/rcupdate.h>
45 #include <linux/uaccess.h>
46 #include <asm/traps.h>
47 #include <asm/setup.h>
49 void (*pm_power_off)(void) = NULL;
50 EXPORT_SYMBOL(pm_power_off);
52 asmlinkage void ret_from_fork(void);
53 asmlinkage void ret_from_kernel_thread(void);
56 * The idle loop on an H8/300..
58 void arch_cpu_idle(void)
64 void machine_restart(char *__unused)
70 void machine_halt(void)
78 void machine_power_off(void)
86 void show_regs(struct pt_regs *regs)
88 show_regs_print_info(KERN_DEFAULT);
91 pr_notice("PC: %08lx Status: %02x\n",
93 pr_notice("ORIG_ER0: %08lx ER0: %08lx ER1: %08lx\n",
94 regs->orig_er0, regs->er0, regs->er1);
95 pr_notice("ER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx\n",
96 regs->er2, regs->er3, regs->er4, regs->er5);
97 pr_notice("ER6' %08lx ", regs->er6);
99 printk("USP: %08lx\n", rdusp());
104 void flush_thread(void)
108 int copy_thread(unsigned long clone_flags,
109 unsigned long usp, unsigned long topstk,
110 struct task_struct *p)
112 struct pt_regs *childregs;
114 childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
116 if (unlikely(p->flags & PF_KTHREAD)) {
117 memset(childregs, 0, sizeof(struct pt_regs));
118 childregs->retpc = (unsigned long) ret_from_kernel_thread;
119 childregs->er4 = topstk; /* arg */
120 childregs->er5 = usp; /* fn */
122 *childregs = *current_pt_regs();
124 childregs->retpc = (unsigned long) ret_from_fork;
125 p->thread.usp = usp ?: rdusp();
127 p->thread.ksp = (unsigned long)childregs;
132 unsigned long get_wchan(struct task_struct *p)
134 unsigned long fp, pc;
135 unsigned long stack_page;
138 if (!p || p == current || p->state == TASK_RUNNING)
141 stack_page = (unsigned long)p;
142 fp = ((struct pt_regs *)p->thread.ksp)->er6;
144 if (fp < stack_page+sizeof(struct thread_info) ||
145 fp >= 8184+stack_page)
147 pc = ((unsigned long *)fp)[1];
148 if (!in_sched_functions(pc))
150 fp = *(unsigned long *) fp;
151 } while (count++ < 16);
155 /* generic sys_clone is not enough registers */
156 asmlinkage int sys_clone(unsigned long __user *args)
158 unsigned long clone_flags;
160 uintptr_t parent_tidptr;
161 uintptr_t child_tidptr;
163 get_user(clone_flags, &args[0]);
164 get_user(newsp, &args[1]);
165 get_user(parent_tidptr, &args[2]);
166 get_user(child_tidptr, &args[3]);
167 return do_fork(clone_flags, newsp, 0,
168 (int __user *)parent_tidptr, (int __user *)child_tidptr);