1/* $Id: traps.c,v 1.1.1.1 2007-08-03 18:51:41 $
2 *
3 *  linux/arch/cris/arch-v10/traps.c
4 *
5 *  Heler functions for trap handlers
6 *
7 *  Copyright (C) 2000-2002 Axis Communications AB
8 *
9 *  Authors:   Bjorn Wesen
10 *  	       Hans-Peter Nilsson
11 *
12 */
13
14#include <linux/ptrace.h>
15#include <asm/uaccess.h>
16#include <asm/arch/sv_addr_ag.h>
17
18extern int raw_printk(const char *fmt, ...);
19
20void
21show_registers(struct pt_regs * regs)
22{
23	/* We either use rdusp() - the USP register, which might not
24	   correspond to the current process for all cases we're called,
25	   or we use the current->thread.usp, which is not up to date for
26	   the current process.  Experience shows we want the USP
27	   register.  */
28	unsigned long usp = rdusp();
29
30	raw_printk("IRP: %08lx SRP: %08lx DCCR: %08lx USP: %08lx MOF: %08lx\n",
31	       regs->irp, regs->srp, regs->dccr, usp, regs->mof );
32	raw_printk(" r0: %08lx  r1: %08lx   r2: %08lx  r3: %08lx\n",
33	       regs->r0, regs->r1, regs->r2, regs->r3);
34	raw_printk(" r4: %08lx  r5: %08lx   r6: %08lx  r7: %08lx\n",
35	       regs->r4, regs->r5, regs->r6, regs->r7);
36	raw_printk(" r8: %08lx  r9: %08lx  r10: %08lx r11: %08lx\n",
37	       regs->r8, regs->r9, regs->r10, regs->r11);
38	raw_printk("r12: %08lx r13: %08lx oR10: %08lx  sp: %08lx\n",
39	       regs->r12, regs->r13, regs->orig_r10, regs);
40	raw_printk("R_MMU_CAUSE: %08lx\n", (unsigned long)*R_MMU_CAUSE);
41	raw_printk("Process %s (pid: %d, stackpage=%08lx)\n",
42	       current->comm, current->pid, (unsigned long)current);
43
44	/*
45         * When in-kernel, we also print out the stack and code at the
46         * time of the fault..
47         */
48        if (! user_mode(regs)) {
49	  	int i;
50
51                show_stack(NULL, (unsigned long*)usp);
52
53		/* Dump kernel stack if the previous dump wasn't one.  */
54		if (usp != 0)
55			show_stack (NULL, NULL);
56
57                raw_printk("\nCode: ");
58                if(regs->irp < PAGE_OFFSET)
59                        goto bad;
60
61		/* Often enough the value at regs->irp does not point to
62		   the interesting instruction, which is most often the
63		   _previous_ instruction.  So we dump at an offset large
64		   enough that instruction decoding should be in sync at
65		   the interesting point, but small enough to fit on a row
66		   (sort of).  We point out the regs->irp location in a
67		   ksymoops-friendly way by wrapping the byte for that
68		   address in parentheses.  */
69                for(i = -12; i < 12; i++)
70                {
71                        unsigned char c;
72                        if(__get_user(c, &((unsigned char*)regs->irp)[i])) {
73bad:
74                                raw_printk(" Bad IP value.");
75                                break;
76                        }
77
78			if (i == 0)
79			  raw_printk("(%02x) ", c);
80			else
81			  raw_printk("%02x ", c);
82                }
83		raw_printk("\n");
84        }
85}
86
87/* Called from entry.S when the watchdog has bitten
88 * We print out something resembling an oops dump, and if
89 * we have the nice doggy development flag set, we halt here
90 * instead of rebooting.
91 */
92
93extern void reset_watchdog(void);
94extern void stop_watchdog(void);
95
96
97void
98watchdog_bite_hook(struct pt_regs *regs)
99{
100#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
101	local_irq_disable();
102	stop_watchdog();
103	show_registers(regs);
104	while(1) /* nothing */;
105#else
106	show_registers(regs);
107#endif
108}
109
110/* This is normally the 'Oops' routine */
111void
112die_if_kernel(const char * str, struct pt_regs * regs, long err)
113{
114	if(user_mode(regs))
115		return;
116
117#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
118	/* This printout might take too long and trigger the
119	 * watchdog normally. If we're in the nice doggy
120	 * development mode, stop the watchdog during printout.
121	 */
122	stop_watchdog();
123#endif
124
125	raw_printk("%s: %04lx\n", str, err & 0xffff);
126
127	show_registers(regs);
128
129#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
130	reset_watchdog();
131#endif
132	do_exit(SIGSEGV);
133}
134
135void arch_enable_nmi(void)
136{
137  asm volatile("setf m");
138}
139