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/sched/debug.h>
20 #include <linux/mm_types.h>
21 #include <linux/kernel.h>
22 #include <linux/errno.h>
23 #include <linux/init.h>
24 #include <linux/module.h>
25 #include <linux/bug.h>
26
27 #include <asm/irq.h>
28 #include <asm/traps.h>
29 #include <asm/page.h>
30
31 static DEFINE_SPINLOCK(die_lock);
32
33 /*
34 * this must be called very early as the kernel might
35 * use some instruction that are emulated on the 060
36 */
37
base_trap_init(void)38 void __init base_trap_init(void)
39 {
40 }
41
set_esp0(unsigned long ssp)42 asmlinkage void set_esp0(unsigned long ssp)
43 {
44 current->thread.esp0 = ssp;
45 }
46
47 /*
48 * Generic dumping code. Used for panic and debug.
49 */
50
dump(struct pt_regs * fp)51 static void dump(struct pt_regs *fp)
52 {
53 unsigned long *sp;
54 unsigned char *tp;
55 int i;
56
57 pr_info("\nCURRENT PROCESS:\n\n");
58 pr_info("COMM=%s PID=%d\n", current->comm, current->pid);
59 if (current->mm) {
60 pr_info("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
61 (int) current->mm->start_code,
62 (int) current->mm->end_code,
63 (int) current->mm->start_data,
64 (int) current->mm->end_data,
65 (int) current->mm->end_data,
66 (int) current->mm->brk);
67 pr_info("USER-STACK=%08x KERNEL-STACK=%08lx\n\n",
68 (int) current->mm->start_stack,
69 (int) PAGE_SIZE+(unsigned long)current);
70 }
71
72 show_regs(fp);
73 pr_info("\nCODE:");
74 tp = ((unsigned char *) fp->pc) - 0x20;
75 for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) {
76 if ((i % 0x10) == 0)
77 pr_info("\n%08x: ", (int) (tp + i));
78 pr_info("%08x ", (int) *sp++);
79 }
80 pr_info("\n");
81
82 pr_info("\nKERNEL STACK:");
83 tp = ((unsigned char *) fp) - 0x40;
84 for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
85 if ((i % 0x10) == 0)
86 pr_info("\n%08x: ", (int) (tp + i));
87 pr_info("%08x ", (int) *sp++);
88 }
89 pr_info("\n");
90 if (STACK_MAGIC != *(unsigned long *)((unsigned long)current+PAGE_SIZE))
91 pr_info("(Possibly corrupted stack page??)\n");
92
93 pr_info("\n\n");
94 }
95
die(const char * str,struct pt_regs * fp,unsigned long err)96 void die(const char *str, struct pt_regs *fp, unsigned long err)
97 {
98 static int diecount;
99
100 oops_enter();
101
102 console_verbose();
103 spin_lock_irq(&die_lock);
104 report_bug(fp->pc, fp);
105 pr_crit("%s: %04lx [#%d] ", str, err & 0xffff, ++diecount);
106 dump(fp);
107
108 spin_unlock_irq(&die_lock);
109 do_exit(SIGSEGV);
110 }
111
112 static int kstack_depth_to_print = 24;
113
show_stack(struct task_struct * task,unsigned long * esp,const char * loglvl)114 void show_stack(struct task_struct *task, unsigned long *esp, const char *loglvl)
115 {
116 unsigned long *stack, addr;
117 int i;
118
119 if (esp == NULL)
120 esp = (unsigned long *) &esp;
121
122 stack = esp;
123
124 printk("%sStack from %08lx:", loglvl, (unsigned long)stack);
125 for (i = 0; i < kstack_depth_to_print; i++) {
126 if (((unsigned long)stack & (THREAD_SIZE - 1)) >=
127 THREAD_SIZE-4)
128 break;
129 if (i % 8 == 0)
130 printk("%s ", loglvl);
131 pr_cont(" %08lx", *stack++);
132 }
133
134 printk("%s\nCall Trace:\n", loglvl);
135 i = 0;
136 stack = esp;
137 while (((unsigned long)stack & (THREAD_SIZE - 1)) < THREAD_SIZE-4) {
138 addr = *stack++;
139 /*
140 * If the address is either in the text segment of the
141 * kernel, or in the region which contains vmalloc'ed
142 * memory, it *may* be the address of a calling
143 * routine; if so, print it so that someone tracing
144 * down the cause of the crash will be able to figure
145 * out the call path that was taken.
146 */
147 if (check_kernel_text(addr)) {
148 if (i % 4 == 0)
149 printk("%s ", loglvl);
150 pr_cont(" [<%08lx>]", addr);
151 i++;
152 }
153 }
154 printk("%s\n", loglvl);
155 }
156