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
base_trap_init(void)36 void __init base_trap_init(void)
37 {
38 }
39
trap_init(void)40 void __init trap_init(void)
41 {
42 }
43
set_esp0(unsigned long ssp)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
dump(struct pt_regs * fp)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
die(const char * str,struct pt_regs * fp,unsigned long err)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
show_stack(struct task_struct * task,unsigned long * esp)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
show_trace_task(struct task_struct * tsk)158 void show_trace_task(struct task_struct *tsk)
159 {
160 show_stack(tsk, (unsigned long *)tsk->thread.esp0);
161 }
162