dump_stack: unify debug information printed by show_regs()
[linux-3.10.git] / arch / h8300 / kernel / process.c
1 /*
2  *  linux/arch/h8300/kernel/process.c
3  *
4  * Yoshinori Sato <ysato@users.sourceforge.jp>
5  *
6  *  Based on:
7  *
8  *  linux/arch/m68knommu/kernel/process.c
9  *
10  *  Copyright (C) 1998  D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
11  *                      Kenneth Albanowski <kjahds@kjahds.com>,
12  *                      The Silver Hammer Group, Ltd.
13  *
14  *  linux/arch/m68k/kernel/process.c
15  *
16  *  Copyright (C) 1995  Hamish Macdonald
17  *
18  *  68060 fixes by Jesper Skov
19  */
20
21 /*
22  * This file handles the architecture-dependent parts of process handling..
23  */
24
25 #include <linux/errno.h>
26 #include <linux/module.h>
27 #include <linux/sched.h>
28 #include <linux/kernel.h>
29 #include <linux/mm.h>
30 #include <linux/smp.h>
31 #include <linux/stddef.h>
32 #include <linux/unistd.h>
33 #include <linux/ptrace.h>
34 #include <linux/user.h>
35 #include <linux/interrupt.h>
36 #include <linux/reboot.h>
37 #include <linux/fs.h>
38 #include <linux/slab.h>
39 #include <linux/rcupdate.h>
40
41 #include <asm/uaccess.h>
42 #include <asm/traps.h>
43 #include <asm/setup.h>
44 #include <asm/pgtable.h>
45
46 void (*pm_power_off)(void) = NULL;
47 EXPORT_SYMBOL(pm_power_off);
48
49 asmlinkage void ret_from_fork(void);
50 asmlinkage void ret_from_kernel_thread(void);
51
52 /*
53  * The idle loop on an H8/300..
54  */
55 #if !defined(CONFIG_H8300H_SIM) && !defined(CONFIG_H8S_SIM)
56 void arch_cpu_idle(void)
57 {
58         local_irq_enable();
59         /* XXX: race here! What if need_resched() gets set now? */
60         __asm__("sleep");
61 }
62 #endif
63
64 void machine_restart(char * __unused)
65 {
66         local_irq_disable();
67         __asm__("jmp @@0"); 
68 }
69
70 void machine_halt(void)
71 {
72         local_irq_disable();
73         __asm__("sleep");
74         for (;;);
75 }
76
77 void machine_power_off(void)
78 {
79         local_irq_disable();
80         __asm__("sleep");
81         for (;;);
82 }
83
84 void show_regs(struct pt_regs * regs)
85 {
86         show_regs_print_info(KERN_DEFAULT);
87
88         printk("\nPC: %08lx  Status: %02x",
89                regs->pc, regs->ccr);
90         printk("\nORIG_ER0: %08lx ER0: %08lx ER1: %08lx",
91                regs->orig_er0, regs->er0, regs->er1);
92         printk("\nER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx",
93                regs->er2, regs->er3, regs->er4, regs->er5);
94         printk("\nER6' %08lx ",regs->er6);
95         if (user_mode(regs))
96                 printk("USP: %08lx\n", rdusp());
97         else
98                 printk("\n");
99 }
100
101 void flush_thread(void)
102 {
103 }
104
105 int copy_thread(unsigned long clone_flags,
106                 unsigned long usp, unsigned long topstk,
107                  struct task_struct * p)
108 {
109         struct pt_regs * childregs;
110
111         childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
112
113         if (unlikely(p->flags & PF_KTHREAD)) {
114                 memset(childregs, 0, sizeof(struct pt_regs));
115                 childregs->retpc = (unsigned long) ret_from_kernel_thread;
116                 childregs->er4 = topstk; /* arg */
117                 childregs->er5 = usp; /* fn */
118                 p->thread.ksp = (unsigned long)childregs;
119         }
120         *childregs = *current_pt_regs();
121         childregs->retpc = (unsigned long) ret_from_fork;
122         childregs->er0 = 0;
123         p->thread.usp = usp ?: rdusp();
124         p->thread.ksp = (unsigned long)childregs;
125
126         return 0;
127 }
128
129 unsigned long thread_saved_pc(struct task_struct *tsk)
130 {
131         return ((struct pt_regs *)tsk->thread.esp0)->pc;
132 }
133
134 unsigned long get_wchan(struct task_struct *p)
135 {
136         unsigned long fp, pc;
137         unsigned long stack_page;
138         int count = 0;
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 }