1/*
2 * arch/v850/kernel/bug.c -- Bug reporting functions
3 *
4 *  Copyright (C) 2001,02,03  NEC Electronics Corporation
5 *  Copyright (C) 2001,02,03  Miles Bader <miles@gnu.org>
6 *
7 * This file is subject to the terms and conditions of the GNU General
8 * Public License.  See the file COPYING in the main directory of this
9 * archive for more details.
10 *
11 * Written by Miles Bader <miles@gnu.org>
12 */
13
14#include <linux/kernel.h>
15#include <linux/reboot.h>
16#include <linux/sched.h>
17#include <linux/module.h>
18
19#include <asm/errno.h>
20#include <asm/ptrace.h>
21#include <asm/processor.h>
22#include <asm/current.h>
23
24/* We should use __builtin_return_address, but it doesn't work in gcc-2.90
25   (which is currently our standard compiler on the v850).  */
26#define ret_addr() ({ register u32 lp asm ("lp"); lp; })
27#define stack_addr() ({ register u32 sp asm ("sp"); sp; })
28
29void __bug ()
30{
31	printk (KERN_CRIT "kernel BUG at PC 0x%x (SP ~0x%x)!\n",
32		ret_addr() - 4, /* - 4 for `jarl' */
33		stack_addr());
34	machine_halt ();
35}
36
37int bad_trap (int trap_num, struct pt_regs *regs)
38{
39	printk (KERN_CRIT
40		"unimplemented trap %d called at 0x%08lx, pid %d!\n",
41		trap_num, regs->pc, current->pid);
42	return -ENOSYS;
43}
44
45#ifdef CONFIG_RESET_GUARD
46void unexpected_reset (unsigned long ret_addr, unsigned long kmode,
47		       struct task_struct *task, unsigned long sp)
48{
49	printk (KERN_CRIT
50		"unexpected reset in %s mode, pid %d"
51		" (ret_addr = 0x%lx, sp = 0x%lx)\n",
52		kmode ? "kernel" : "user",
53		task ? task->pid : -1,
54		ret_addr, sp);
55
56	machine_halt ();
57}
58#endif /* CONFIG_RESET_GUARD */
59
60
61
62struct spec_reg_name {
63	const char *name;
64	int gpr;
65};
66
67struct spec_reg_name spec_reg_names[] = {
68	{ "sp", GPR_SP },
69	{ "gp", GPR_GP },
70	{ "tp", GPR_TP },
71	{ "ep", GPR_EP },
72	{ "lp", GPR_LP },
73	{ 0, 0 }
74};
75
76void show_regs (struct pt_regs *regs)
77{
78	int gpr_base, gpr_offs;
79
80	printk ("     pc 0x%08lx    psw 0x%08lx                       kernel_mode %d\n",
81		regs->pc, regs->psw, regs->kernel_mode);
82	printk ("   ctpc 0x%08lx  ctpsw 0x%08lx   ctbp 0x%08lx\n",
83		regs->ctpc, regs->ctpsw, regs->ctbp);
84
85	for (gpr_base = 0; gpr_base < NUM_GPRS; gpr_base += 4) {
86		for (gpr_offs = 0; gpr_offs < 4; gpr_offs++) {
87			int gpr = gpr_base + gpr_offs;
88			long val = regs->gpr[gpr];
89			struct spec_reg_name *srn;
90
91			for (srn = spec_reg_names; srn->name; srn++)
92				if (srn->gpr == gpr)
93					break;
94
95			if (srn->name)
96				printk ("%7s 0x%08lx", srn->name, val);
97			else
98				printk ("    r%02d 0x%08lx", gpr, val);
99		}
100
101		printk ("\n");
102	}
103}
104
105/*
106 * TASK is a pointer to the task whose backtrace we want to see (or NULL
107 * for current task), SP is the stack pointer of the first frame that
108 * should be shown in the back trace (or NULL if the entire call-chain of
109 * the task should be shown).
110 */
111void show_stack (struct task_struct *task, unsigned long *sp)
112{
113	unsigned long addr, end;
114
115	if (sp)
116		addr = (unsigned long)sp;
117	else if (task)
118		addr = task_sp (task);
119	else
120		addr = stack_addr ();
121
122	addr = addr & ~3;
123	end = (addr + THREAD_SIZE - 1) & THREAD_MASK;
124
125	while (addr < end) {
126		printk ("%8lX: ", addr);
127		while (addr < end) {
128			printk (" %8lX", *(unsigned long *)addr);
129			addr += sizeof (unsigned long);
130			if (! (addr & 0xF))
131				break;
132		}
133		printk ("\n");
134	}
135}
136
137void dump_stack ()
138{
139	show_stack (0, 0);
140}
141
142EXPORT_SYMBOL(dump_stack);
143