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/arch/v850/kernel/bug.c

https://bitbucket.org/evzijst/gittest
C | 142 lines | 100 code | 22 blank | 20 comment | 12 complexity | f8508295a90b6b04ced56c348862ae9d MD5 | raw file
  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);