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