1/*
2 * Helper functions for trap handlers
3 *
4 * Copyright (C) 2000-2007, Axis Communications AB.
5 *
6 * Authors:   Bjorn Wesen
7 *            Hans-Peter Nilsson
8 *
9 */
10
11#include <linux/ptrace.h>
12#include <asm/uaccess.h>
13#include <arch/sv_addr_ag.h>
14#include <arch/system.h>
15
16void
17show_registers(struct pt_regs *regs)
18{
19	/*
20	 * It's possible to use either the USP register or current->thread.usp.
21	 * USP might not correspond to the current process for all cases this
22	 * function is called, and current->thread.usp isn't up to date for the
23	 * current process. Experience shows that using USP is the way to go.
24	 */
25	unsigned long usp = rdusp();
26
27	printk("IRP: %08lx SRP: %08lx DCCR: %08lx USP: %08lx MOF: %08lx\n",
28	       regs->irp, regs->srp, regs->dccr, usp, regs->mof);
29
30	printk(" r0: %08lx  r1: %08lx   r2: %08lx  r3: %08lx\n",
31	       regs->r0, regs->r1, regs->r2, regs->r3);
32
33	printk(" r4: %08lx  r5: %08lx   r6: %08lx  r7: %08lx\n",
34	       regs->r4, regs->r5, regs->r6, regs->r7);
35
36	printk(" r8: %08lx  r9: %08lx  r10: %08lx r11: %08lx\n",
37	       regs->r8, regs->r9, regs->r10, regs->r11);
38
39	printk("r12: %08lx r13: %08lx oR10: %08lx  sp: %08lx\n",
40	       regs->r12, regs->r13, regs->orig_r10, (long unsigned)regs);
41
42	printk("R_MMU_CAUSE: %08lx\n", (unsigned long)*R_MMU_CAUSE);
43
44	printk("Process %s (pid: %d, stackpage=%08lx)\n",
45	       current->comm, current->pid, (unsigned long)current);
46
47	/*
48	 * When in-kernel, we also print out the stack and code at the
49	 * time of the fault..
50	 */
51	if (!user_mode(regs)) {
52		int i;
53
54		show_stack(NULL, (unsigned long *)usp);
55
56		/*
57		 * If the previous stack-dump wasn't a kernel one, dump the
58		 * kernel stack now.
59		 */
60		if (usp != 0)
61			show_stack(NULL, NULL);
62
63		printk("\nCode: ");
64
65		if (regs->irp < PAGE_OFFSET)
66			goto bad_value;
67
68		/*
69		 * Quite often the value at regs->irp doesn't point to the
70		 * interesting instruction, which often is the previous
71		 * instruction. So dump at an offset large enough that the
72		 * instruction decoding should be in sync at the interesting
73		 * point, but small enough to fit on a row. The regs->irp
74		 * location is pointed out in a ksymoops-friendly way by
75		 * wrapping the byte for that address in parenthesises.
76		 */
77		for (i = -12; i < 12; i++) {
78			unsigned char c;
79
80			if (__get_user(c, &((unsigned char *)regs->irp)[i])) {
81bad_value:
82				printk(" Bad IP value.");
83				break;
84			}
85
86			if (i == 0)
87				printk("(%02x) ", c);
88			else
89				printk("%02x ", c);
90		}
91		printk("\n");
92	}
93}
94
95void
96arch_enable_nmi(void)
97{
98	asm volatile ("setf m");
99}
100
101extern void (*nmi_handler)(struct pt_regs *);
102void handle_nmi(struct pt_regs *regs)
103{
104	if (nmi_handler)
105		nmi_handler(regs);
106
107	/* Wait until nmi is no longer active. (We enable NMI immediately after
108	   returning from this function, and we don't want it happening while
109	   exiting from the NMI interrupt handler.) */
110	while (*R_IRQ_MASK0_RD & IO_STATE(R_IRQ_MASK0_RD, nmi_pin, active))
111		;
112}
113
114#ifdef CONFIG_DEBUG_BUGVERBOSE
115void
116handle_BUG(struct pt_regs *regs)
117{
118	struct bug_frame f;
119	unsigned char c;
120	unsigned long irp = regs->irp;
121
122	if (__copy_from_user(&f, (const void __user *)(irp - 8), sizeof f))
123		return;
124	if (f.prefix != BUG_PREFIX || f.magic != BUG_MAGIC)
125		return;
126	if (__get_user(c, f.filename))
127		f.filename = "<bad filename>";
128
129	printk("kernel BUG at %s:%d!\n", f.filename, f.line);
130}
131#endif
132