aboutsummaryrefslogtreecommitdiff
path: root/arch/cris/arch-v32/kernel/traps.c
blob: 8bbe09c931322cf4311383ab6f2fe169f746f8a1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
/*
 * Copyright (C) 2003-2006, Axis Communications AB.
 */

#include <linux/ptrace.h>
#include <linux/module.h>
#include <asm/uaccess.h>
#include <hwregs/supp_reg.h>
#include <hwregs/intr_vect_defs.h>
#include <asm/irq.h>

void show_registers(struct pt_regs *regs)
{
	/*
	 * It's possible to use either the USP register or current->thread.usp.
	 * USP might not correspond to the current process for all cases this
	 * function is called, and current->thread.usp isn't up to date for the
	 * current process. Experience shows that using USP is the way to go.
	 */
	unsigned long usp = rdusp();
	unsigned long d_mmu_cause;
	unsigned long i_mmu_cause;

	printk("CPU: %d\n", smp_processor_id());

	printk("ERP: %08lx SRP: %08lx  CCS: %08lx USP: %08lx MOF: %08lx\n",
	       regs->erp, regs->srp, regs->ccs, usp, regs->mof);

	printk(" r0: %08lx  r1: %08lx   r2: %08lx  r3: %08lx\n",
	       regs->r0, regs->r1, regs->r2, regs->r3);

	printk(" r4: %08lx  r5: %08lx   r6: %08lx  r7: %08lx\n",
	       regs->r4, regs->r5, regs->r6, regs->r7);

	printk(" r8: %08lx  r9: %08lx  r10: %08lx r11: %08lx\n",
	       regs->r8, regs->r9, regs->r10, regs->r11);

	printk("r12: %08lx r13: %08lx oR10: %08lx acr: %08lx\n",
	       regs->r12, regs->r13, regs->orig_r10, regs->acr);

	printk(" sp: %08lx\n", (unsigned long)regs);

	SUPP_BANK_SEL(BANK_IM);
	SUPP_REG_RD(RW_MM_CAUSE, i_mmu_cause);

	SUPP_BANK_SEL(BANK_DM);
	SUPP_REG_RD(RW_MM_CAUSE, d_mmu_cause);

	printk("       Data MMU Cause: %08lx\n", d_mmu_cause);
	printk("Instruction MMU Cause: %08lx\n", i_mmu_cause);

	printk("Process %s (pid: %d, stackpage=%08lx)\n",
	       current->comm, current->pid, (unsigned long)current);

	/*
	 * When in-kernel, we also print out the stack and code at the
	 * time of the fault..
	 */
	if (!user_mode(regs)) {
		int i;

		show_stack(NULL, (unsigned long *)usp);

		/*
		 * If the previous stack-dump wasn't a kernel one, dump the
		 * kernel stack now.
		 */
		if (usp != 0)
			show_stack(NULL, NULL);

		printk("\nCode: ");

		if (regs->erp < PAGE_OFFSET)
			goto bad_value;

		/*
		 * Quite often the value at regs->erp doesn't point to the
		 * interesting instruction, which often is the previous
		 * instruction. So dump at an offset large enough that the
		 * instruction decoding should be in sync at the interesting
		 * point, but small enough to fit on a row. The regs->erp
		 * location is pointed out in a ksymoops-friendly way by
		 * wrapping the byte for that address in parenthesises.
		 */
		for (i = -12; i < 12; i++) {
			unsigned char c;

			if (__get_user(c, &((unsigned char *)regs->erp)[i])) {
bad_value:
				printk(" Bad IP value.");
				break;
			}

			if (i == 0)
				printk("(%02x) ", c);
			else
				printk("%02x ", c);
		}
		printk("\n");
	}
}

void arch_enable_nmi(void)
{
	unsigned long flags;

	local_save_flags(flags);
	flags |= (1 << 30); /* NMI M flag is at bit 30 */
	local_irq_restore(flags);
}

extern void (*nmi_handler)(struct pt_regs *);
void handle_nmi(struct pt_regs *regs)
{
#ifdef CONFIG_ETRAXFS
	reg_intr_vect_r_nmi r;
#endif

	if (nmi_handler)
		nmi_handler(regs);

#ifdef CONFIG_ETRAXFS
	/* Wait until nmi is no longer active. */
	do {
		r = REG_RD(intr_vect, regi_irq, r_nmi);
	} while (r.ext == regk_intr_vect_on);
#endif
}


#ifdef CONFIG_BUG
extern void die_if_kernel(const char *str, struct pt_regs *regs, long err);

/* Copy of the regs at BUG() time.  */
struct pt_regs BUG_regs;

void do_BUG(char *file, unsigned int line)
{
	printk("kernel BUG at %s:%d!\n", file, line);
	die_if_kernel("Oops", &BUG_regs, 0);
}
EXPORT_SYMBOL(do_BUG);

void fixup_BUG(struct pt_regs *regs)
{
	BUG_regs = *regs;

#ifdef CONFIG_DEBUG_BUGVERBOSE
	/*
	 * Fixup the BUG arguments through exception handlers.
	 */
	{
		const struct exception_table_entry *fixup;

		/*
		 * ERP points at the "break 14" + 2, compensate for the 2
		 * bytes.
		 */
		fixup = search_exception_tables(instruction_pointer(regs) - 2);
		if (fixup) {
			/* Adjust the instruction pointer in the stackframe. */
			instruction_pointer(regs) = fixup->fixup;
			arch_fixup(regs);
		}
	}
#else
	/* Dont try to lookup the filename + line, just dump regs.  */
	do_BUG("unknown", 0);
#endif
}

/*
 * Break 14 handler. Save regs and jump into the fixup_BUG.
 */
__asm__  ( ".text\n\t"
	   ".global breakh_BUG\n\t"
	   "breakh_BUG:\n\t"
	   SAVE_ALL
	   KGDB_FIXUP
	   "move.d $sp, $r10\n\t"
	   "jsr fixup_BUG\n\t"
	   "nop\n\t"
	   "jump ret_from_intr\n\t"
	   "nop\n\t");


#ifdef CONFIG_DEBUG_BUGVERBOSE
void
handle_BUG(struct pt_regs *regs)
{
}
#endif
#endif