1/* $Id: traps.c,v 1.1.1.1 2007-08-03 18:51:42 $
2 *
3 *  linux/arch/cris/traps.c
4 *
5 *  Here we handle the break vectors not used by the system call
6 *  mechanism, as well as some general stack/register dumping
7 *  things.
8 *
9 *  Copyright (C) 2000-2002 Axis Communications AB
10 *
11 *  Authors:   Bjorn Wesen
12 *  	       Hans-Peter Nilsson
13 *
14 */
15
16#include <linux/init.h>
17#include <linux/module.h>
18#include <asm/pgtable.h>
19#include <asm/uaccess.h>
20
21static int kstack_depth_to_print = 24;
22
23extern int raw_printk(const char *fmt, ...);
24
25void show_trace(unsigned long * stack)
26{
27	unsigned long addr, module_start, module_end;
28	extern char _stext, _etext;
29	int i;
30
31        raw_printk("\nCall Trace: ");
32
33        i = 1;
34        module_start = VMALLOC_START;
35        module_end = VMALLOC_END;
36
37        while (((long) stack & (THREAD_SIZE-1)) != 0) {
38		if (__get_user (addr, stack)) {
39			/* This message matches "failing address" marked
40			   s390 in ksymoops, so lines containing it will
41			   not be filtered out by ksymoops.  */
42			raw_printk ("Failing address 0x%lx\n", (unsigned long)stack);
43			break;
44		}
45		stack++;
46
47                /*
48                 * If the address is either in the text segment of the
49                 * kernel, or in the region which contains vmalloc'ed
50                 * memory, it *may* be the address of a calling
51                 * routine; if so, print it so that someone tracing
52                 * down the cause of the crash will be able to figure
53                 * out the call path that was taken.
54                 */
55                if (((addr >= (unsigned long) &_stext) &&
56                     (addr <= (unsigned long) &_etext)) ||
57                    ((addr >= module_start) && (addr <= module_end))) {
58                        if (i && ((i % 8) == 0))
59                                raw_printk("\n       ");
60                        raw_printk("[<%08lx>] ", addr);
61                        i++;
62                }
63        }
64}
65
66/*
67 * These constants are for searching for possible module text
68 * segments. MODULE_RANGE is a guess of how much space is likely
69 * to be vmalloced.
70 */
71
72#define MODULE_RANGE (8*1024*1024)
73
74/*
75 * The output (format, strings and order) is adjusted to be usable with
76 * ksymoops-2.4.1 with some necessary CRIS-specific patches.  Please don't
77 * change it unless you're serious about adjusting ksymoops and syncing
78 * with the ksymoops maintainer.
79 */
80
81void
82show_stack(struct task_struct *task, unsigned long *sp)
83{
84        unsigned long *stack, addr;
85        int i;
86
87	/*
88	 * debugging aid: "show_stack(NULL);" prints a
89	 * back trace.
90	 */
91
92        if(sp == NULL) {
93		if (task)
94			sp = (unsigned long*)task->thread.ksp;
95		else
96			sp = (unsigned long*)rdsp();
97	}
98
99        stack = sp;
100
101	raw_printk("\nStack from %08lx:\n       ", (unsigned long)stack);
102        for(i = 0; i < kstack_depth_to_print; i++) {
103                if (((long) stack & (THREAD_SIZE-1)) == 0)
104                        break;
105                if (i && ((i % 8) == 0))
106                        raw_printk("\n       ");
107		if (__get_user (addr, stack)) {
108			/* This message matches "failing address" marked
109			   s390 in ksymoops, so lines containing it will
110			   not be filtered out by ksymoops.  */
111			raw_printk ("Failing address 0x%lx\n", (unsigned long)stack);
112			break;
113		}
114		stack++;
115		raw_printk("%08lx ", addr);
116        }
117	show_trace(sp);
118}
119
120static void (*nmi_handler)(struct pt_regs*);
121extern void arch_enable_nmi(void);
122
123void set_nmi_handler(void (*handler)(struct pt_regs*))
124{
125  nmi_handler = handler;
126  arch_enable_nmi();
127}
128
129void handle_nmi(struct pt_regs* regs)
130{
131  if (nmi_handler)
132    nmi_handler(regs);
133}
134
135#ifdef CONFIG_DEBUG_NMI_OOPS
136void oops_nmi_handler(struct pt_regs* regs)
137{
138  stop_watchdog();
139  raw_printk("NMI!\n");
140  show_registers(regs);
141}
142
143static int
144__init oops_nmi_register(void)
145{
146  set_nmi_handler(oops_nmi_handler);
147  return 0;
148}
149
150__initcall(oops_nmi_register);
151
152#endif
153
154
155void dump_stack(void)
156{
157	show_stack(NULL, NULL);
158}
159
160EXPORT_SYMBOL(dump_stack);
161
162void __init
163trap_init(void)
164{
165	/* Nothing needs to be done */
166}
167
168void spinning_cpu(void* addr)
169{
170  raw_printk("CPU %d spinning on %X\n", smp_processor_id(), addr);
171  dump_stack();
172}
173