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Linux/arch/h8300/kernel/process.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  *  linux/arch/h8300/kernel/process.c
  4  *
  5  * Yoshinori Sato <ysato@users.sourceforge.jp>
  6  *
  7  *  Based on:
  8  *
  9  *  linux/arch/m68knommu/kernel/process.c
 10  *
 11  *  Copyright (C) 1998  D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
 12  *                      Kenneth Albanowski <kjahds@kjahds.com>,
 13  *                      The Silver Hammer Group, Ltd.
 14  *
 15  *  linux/arch/m68k/kernel/process.c
 16  *
 17  *  Copyright (C) 1995  Hamish Macdonald
 18  *
 19  *  68060 fixes by Jesper Skov
 20  */
 21 
 22 /*
 23  * This file handles the architecture-dependent parts of process handling..
 24  */
 25 
 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>
 33 #include <linux/mm.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>
 41 #include <linux/fs.h>
 42 #include <linux/slab.h>
 43 #include <linux/rcupdate.h>
 44 
 45 #include <linux/uaccess.h>
 46 #include <asm/traps.h>
 47 #include <asm/setup.h>
 48 #include <asm/pgtable.h>
 49 
 50 void (*pm_power_off)(void) = NULL;
 51 EXPORT_SYMBOL(pm_power_off);
 52 
 53 asmlinkage void ret_from_fork(void);
 54 asmlinkage void ret_from_kernel_thread(void);
 55 
 56 /*
 57  * The idle loop on an H8/300..
 58  */
 59 void arch_cpu_idle(void)
 60 {
 61         local_irq_enable();
 62         __asm__("sleep");
 63 }
 64 
 65 void machine_restart(char *__unused)
 66 {
 67         local_irq_disable();
 68         __asm__("jmp @@0");
 69 }
 70 
 71 void machine_halt(void)
 72 {
 73         local_irq_disable();
 74         __asm__("sleep");
 75         for (;;)
 76                 ;
 77 }
 78 
 79 void machine_power_off(void)
 80 {
 81         local_irq_disable();
 82         __asm__("sleep");
 83         for (;;)
 84                 ;
 85 }
 86 
 87 void show_regs(struct pt_regs *regs)
 88 {
 89         show_regs_print_info(KERN_DEFAULT);
 90 
 91         pr_notice("\n");
 92         pr_notice("PC: %08lx  Status: %02x\n",
 93                regs->pc, regs->ccr);
 94         pr_notice("ORIG_ER0: %08lx ER0: %08lx ER1: %08lx\n",
 95                regs->orig_er0, regs->er0, regs->er1);
 96         pr_notice("ER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx\n",
 97                regs->er2, regs->er3, regs->er4, regs->er5);
 98         pr_notice("ER6' %08lx ", regs->er6);
 99         if (user_mode(regs))
100                 printk("USP: %08lx\n", rdusp());
101         else
102                 printk("\n");
103 }
104 
105 void flush_thread(void)
106 {
107 }
108 
109 int copy_thread(unsigned long clone_flags,
110                 unsigned long usp, unsigned long topstk,
111                 struct task_struct *p)
112 {
113         struct pt_regs *childregs;
114 
115         childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
116 
117         if (unlikely(p->flags & PF_KTHREAD)) {
118                 memset(childregs, 0, sizeof(struct pt_regs));
119                 childregs->retpc = (unsigned long) ret_from_kernel_thread;
120                 childregs->er4 = topstk; /* arg */
121                 childregs->er5 = usp; /* fn */
122         }  else {
123                 *childregs = *current_pt_regs();
124                 childregs->er0 = 0;
125                 childregs->retpc = (unsigned long) ret_from_fork;
126                 p->thread.usp = usp ?: rdusp();
127         }
128         p->thread.ksp = (unsigned long)childregs;
129 
130         return 0;
131 }
132 
133 unsigned long get_wchan(struct task_struct *p)
134 {
135         unsigned long fp, pc;
136         unsigned long stack_page;
137         int count = 0;
138 
139         if (!p || p == current || p->state == TASK_RUNNING)
140                 return 0;
141 
142         stack_page = (unsigned long)p;
143         fp = ((struct pt_regs *)p->thread.ksp)->er6;
144         do {
145                 if (fp < stack_page+sizeof(struct thread_info) ||
146                     fp >= 8184+stack_page)
147                         return 0;
148                 pc = ((unsigned long *)fp)[1];
149                 if (!in_sched_functions(pc))
150                         return pc;
151                 fp = *(unsigned long *) fp;
152         } while (count++ < 16);
153         return 0;
154 }
155 
156 /* generic sys_clone is not enough registers */
157 asmlinkage int sys_clone(unsigned long __user *args)
158 {
159         unsigned long clone_flags;
160         unsigned long  newsp;
161         uintptr_t parent_tidptr;
162         uintptr_t child_tidptr;
163 
164         get_user(clone_flags, &args[0]);
165         get_user(newsp, &args[1]);
166         get_user(parent_tidptr, &args[2]);
167         get_user(child_tidptr, &args[3]);
168         return do_fork(clone_flags, newsp, 0,
169                        (int __user *)parent_tidptr, (int __user *)child_tidptr);
170 }
171 

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