These changes are the raw update to linux-4.4.6-rt14. Kernel sources
[kvmfornfv.git] / kernel / arch / h8300 / kernel / traps.c
1 /*
2  * linux/arch/h8300/boot/traps.c -- general exception handling code
3  * H8/300 support Yoshinori Sato <ysato@users.sourceforge.jp>
4  *
5  * Cloned from Linux/m68k.
6  *
7  * No original Copyright holder listed,
8  * Probable original (C) Roman Zippel (assigned DJD, 1999)
9  *
10  * Copyright 1999-2000 D. Jeff Dionne, <jeff@rt-control.com>
11  *
12  * This file is subject to the terms and conditions of the GNU General Public
13  * License.  See the file COPYING in the main directory of this archive
14  * for more details.
15  */
16
17 #include <linux/types.h>
18 #include <linux/sched.h>
19 #include <linux/kernel.h>
20 #include <linux/errno.h>
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/bug.h>
24
25 #include <asm/irq.h>
26 #include <asm/traps.h>
27 #include <asm/page.h>
28
29 static DEFINE_SPINLOCK(die_lock);
30
31 /*
32  * this must be called very early as the kernel might
33  * use some instruction that are emulated on the 060
34  */
35
36 void __init base_trap_init(void)
37 {
38 }
39
40 void __init trap_init(void)
41 {
42 }
43
44 asmlinkage void set_esp0(unsigned long ssp)
45 {
46         current->thread.esp0 = ssp;
47 }
48
49 /*
50  *      Generic dumping code. Used for panic and debug.
51  */
52
53 static void dump(struct pt_regs *fp)
54 {
55         unsigned long   *sp;
56         unsigned char   *tp;
57         int             i;
58
59         pr_info("\nCURRENT PROCESS:\n\n");
60         pr_info("COMM=%s PID=%d\n", current->comm, current->pid);
61         if (current->mm) {
62                 pr_info("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
63                         (int) current->mm->start_code,
64                         (int) current->mm->end_code,
65                         (int) current->mm->start_data,
66                         (int) current->mm->end_data,
67                         (int) current->mm->end_data,
68                         (int) current->mm->brk);
69                 pr_info("USER-STACK=%08x  KERNEL-STACK=%08lx\n\n",
70                         (int) current->mm->start_stack,
71                         (int) PAGE_SIZE+(unsigned long)current);
72         }
73
74         show_regs(fp);
75         pr_info("\nCODE:");
76         tp = ((unsigned char *) fp->pc) - 0x20;
77         for (sp = (unsigned long *) tp, i = 0; (i < 0x40);  i += 4) {
78                 if ((i % 0x10) == 0)
79                         pr_info("\n%08x: ", (int) (tp + i));
80                 pr_info("%08x ", (int) *sp++);
81         }
82         pr_info("\n");
83
84         pr_info("\nKERNEL STACK:");
85         tp = ((unsigned char *) fp) - 0x40;
86         for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
87                 if ((i % 0x10) == 0)
88                         pr_info("\n%08x: ", (int) (tp + i));
89                 pr_info("%08x ", (int) *sp++);
90         }
91         pr_info("\n");
92         if (STACK_MAGIC != *(unsigned long *)((unsigned long)current+PAGE_SIZE))
93                 pr_info("(Possibly corrupted stack page??)\n");
94
95         pr_info("\n\n");
96 }
97
98 void die(const char *str, struct pt_regs *fp, unsigned long err)
99 {
100         static int diecount;
101
102         oops_enter();
103
104         console_verbose();
105         spin_lock_irq(&die_lock);
106         report_bug(fp->pc, fp);
107         pr_crit("%s: %04lx [#%d] ", str, err & 0xffff, ++diecount);
108         dump(fp);
109
110         spin_unlock_irq(&die_lock);
111         do_exit(SIGSEGV);
112 }
113
114 static int kstack_depth_to_print = 24;
115
116 void show_stack(struct task_struct *task, unsigned long *esp)
117 {
118         unsigned long *stack,  addr;
119         int i;
120
121         if (esp == NULL)
122                 esp = (unsigned long *) &esp;
123
124         stack = esp;
125
126         pr_info("Stack from %08lx:", (unsigned long)stack);
127         for (i = 0; i < kstack_depth_to_print; i++) {
128                 if (((unsigned long)stack & (THREAD_SIZE - 1)) == 0)
129                         break;
130                 if (i % 8 == 0)
131                         pr_info("\n       ");
132                 pr_info(" %08lx", *stack++);
133         }
134
135         pr_info("\nCall Trace:");
136         i = 0;
137         stack = esp;
138         while (((unsigned long)stack & (THREAD_SIZE - 1)) != 0) {
139                 addr = *stack++;
140                 /*
141                  * If the address is either in the text segment of the
142                  * kernel, or in the region which contains vmalloc'ed
143                  * memory, it *may* be the address of a calling
144                  * routine; if so, print it so that someone tracing
145                  * down the cause of the crash will be able to figure
146                  * out the call path that was taken.
147                  */
148                 if (check_kernel_text(addr)) {
149                         if (i % 4 == 0)
150                                 pr_info("\n       ");
151                         pr_info(" [<%08lx>]", addr);
152                         i++;
153                 }
154         }
155         pr_info("\n");
156 }
157
158 void show_trace_task(struct task_struct *tsk)
159 {
160         show_stack(tsk, (unsigned long *)tsk->thread.esp0);
161 }