1/*
2 * Copyright (C) 2003-2006, Axis Communications AB.
3 */
4
5#include <linux/ptrace.h>
6#include <linux/module.h>
7#include <asm/uaccess.h>
8#include <hwregs/supp_reg.h>
9#include <hwregs/intr_vect_defs.h>
10#include <asm/irq.h>
11
12void show_registers(struct pt_regs *regs)
13{
14	/*
15	 * It's possible to use either the USP register or current->thread.usp.
16	 * USP might not correspond to the current process for all cases this
17	 * function is called, and current->thread.usp isn't up to date for the
18	 * current process. Experience shows that using USP is the way to go.
19	 */
20	unsigned long usp = rdusp();
21	unsigned long d_mmu_cause;
22	unsigned long i_mmu_cause;
23
24	printk("CPU: %d\n", smp_processor_id());
25
26	printk("ERP: %08lx SRP: %08lx  CCS: %08lx USP: %08lx MOF: %08lx\n",
27	       regs->erp, regs->srp, regs->ccs, 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 acr: %08lx\n",
39	       regs->r12, regs->r13, regs->orig_r10, regs->acr);
40
41	printk(" sp: %08lx\n", (unsigned long)regs);
42
43	SUPP_BANK_SEL(BANK_IM);
44	SUPP_REG_RD(RW_MM_CAUSE, i_mmu_cause);
45
46	SUPP_BANK_SEL(BANK_DM);
47	SUPP_REG_RD(RW_MM_CAUSE, d_mmu_cause);
48
49	printk("       Data MMU Cause: %08lx\n", d_mmu_cause);
50	printk("Instruction MMU Cause: %08lx\n", i_mmu_cause);
51
52	printk("Process %s (pid: %d, stackpage=%08lx)\n",
53	       current->comm, current->pid, (unsigned long)current);
54
55	/*
56	 * When in-kernel, we also print out the stack and code at the
57	 * time of the fault..
58	 */
59	if (!user_mode(regs)) {
60		int i;
61
62		show_stack(NULL, (unsigned long *)usp);
63
64		/*
65		 * If the previous stack-dump wasn't a kernel one, dump the
66		 * kernel stack now.
67		 */
68		if (usp != 0)
69			show_stack(NULL, NULL);
70
71		printk("\nCode: ");
72
73		if (regs->erp < PAGE_OFFSET)
74			goto bad_value;
75
76		/*
77		 * Quite often the value at regs->erp doesn't point to the
78		 * interesting instruction, which often is the previous
79		 * instruction. So dump at an offset large enough that the
80		 * instruction decoding should be in sync at the interesting
81		 * point, but small enough to fit on a row. The regs->erp
82		 * location is pointed out in a ksymoops-friendly way by
83		 * wrapping the byte for that address in parenthesises.
84		 */
85		for (i = -12; i < 12; i++) {
86			unsigned char c;
87
88			if (__get_user(c, &((unsigned char *)regs->erp)[i])) {
89bad_value:
90				printk(" Bad IP value.");
91				break;
92			}
93
94			if (i == 0)
95				printk("(%02x) ", c);
96			else
97				printk("%02x ", c);
98		}
99		printk("\n");
100	}
101}
102
103void arch_enable_nmi(void)
104{
105	unsigned long flags;
106
107	local_save_flags(flags);
108	flags |= (1 << 30); /* NMI M flag is at bit 30 */
109	local_irq_restore(flags);
110}
111
112extern void (*nmi_handler)(struct pt_regs *);
113void handle_nmi(struct pt_regs *regs)
114{
115#ifdef CONFIG_ETRAXFS
116	reg_intr_vect_r_nmi r;
117#endif
118
119	if (nmi_handler)
120		nmi_handler(regs);
121
122#ifdef CONFIG_ETRAXFS
123	/* Wait until nmi is no longer active. */
124	do {
125		r = REG_RD(intr_vect, regi_irq, r_nmi);
126	} while (r.ext == regk_intr_vect_on);
127#endif
128}
129
130
131#ifdef CONFIG_BUG
132extern void die_if_kernel(const char *str, struct pt_regs *regs, long err);
133
134/* Copy of the regs at BUG() time.  */
135struct pt_regs BUG_regs;
136
137void do_BUG(char *file, unsigned int line)
138{
139	printk("kernel BUG at %s:%d!\n", file, line);
140	die_if_kernel("Oops", &BUG_regs, 0);
141}
142EXPORT_SYMBOL(do_BUG);
143
144void fixup_BUG(struct pt_regs *regs)
145{
146	BUG_regs = *regs;
147
148#ifdef CONFIG_DEBUG_BUGVERBOSE
149	/*
150	 * Fixup the BUG arguments through exception handlers.
151	 */
152	{
153		const struct exception_table_entry *fixup;
154
155		/*
156		 * ERP points at the "break 14" + 2, compensate for the 2
157		 * bytes.
158		 */
159		fixup = search_exception_tables(instruction_pointer(regs) - 2);
160		if (fixup) {
161			/* Adjust the instruction pointer in the stackframe. */
162			instruction_pointer(regs) = fixup->fixup;
163			arch_fixup(regs);
164		}
165	}
166#else
167	/* Dont try to lookup the filename + line, just dump regs.  */
168	do_BUG("unknown", 0);
169#endif
170}
171
172/*
173 * Break 14 handler. Save regs and jump into the fixup_BUG.
174 */
175__asm__  ( ".text\n\t"
176	   ".global breakh_BUG\n\t"
177	   "breakh_BUG:\n\t"
178	   SAVE_ALL
179	   KGDB_FIXUP
180	   "move.d $sp, $r10\n\t"
181	   "jsr fixup_BUG\n\t"
182	   "nop\n\t"
183	   "jump ret_from_intr\n\t"
184	   "nop\n\t");
185
186
187#ifdef CONFIG_DEBUG_BUGVERBOSE
188void
189handle_BUG(struct pt_regs *regs)
190{
191}
192#endif
193#endif
194