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TOMOYO Linux Cross Reference
Linux/arch/microblaze/kernel/traps.c

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  1 /*
  2  * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
  3  * Copyright (C) 2007-2009 PetaLogix
  4  * Copyright (C) 2006 Atmark Techno, Inc.
  5  *
  6  * This file is subject to the terms and conditions of the GNU General Public
  7  * License. See the file "COPYING" in the main directory of this archive
  8  * for more details.
  9  */
 10 
 11 #include <linux/export.h>
 12 #include <linux/kernel.h>
 13 #include <linux/kallsyms.h>
 14 #include <linux/sched.h>
 15 #include <linux/sched/debug.h>
 16 #include <linux/debug_locks.h>
 17 
 18 #include <asm/exceptions.h>
 19 #include <asm/unwind.h>
 20 
 21 void trap_init(void)
 22 {
 23         __enable_hw_exceptions();
 24 }
 25 
 26 static unsigned long kstack_depth_to_print;     /* 0 == entire stack */
 27 
 28 static int __init kstack_setup(char *s)
 29 {
 30         return !kstrtoul(s, 0, &kstack_depth_to_print);
 31 }
 32 __setup("kstack=", kstack_setup);
 33 
 34 void show_stack(struct task_struct *task, unsigned long *sp)
 35 {
 36         unsigned long words_to_show;
 37         u32 fp = (u32) sp;
 38 
 39         if (fp == 0) {
 40                 if (task) {
 41                         fp = ((struct thread_info *)
 42                                 (task->stack))->cpu_context.r1;
 43                 } else {
 44                         /* Pick up caller of dump_stack() */
 45                         fp = (u32)&sp - 8;
 46                 }
 47         }
 48 
 49         words_to_show = (THREAD_SIZE - (fp & (THREAD_SIZE - 1))) >> 2;
 50         if (kstack_depth_to_print && (words_to_show > kstack_depth_to_print))
 51                 words_to_show = kstack_depth_to_print;
 52 
 53         pr_info("Kernel Stack:\n");
 54 
 55         /*
 56          * Make the first line an 'odd' size if necessary to get
 57          * remaining lines to start at an address multiple of 0x10
 58          */
 59         if (fp & 0xF) {
 60                 unsigned long line1_words = (0x10 - (fp & 0xF)) >> 2;
 61                 if (line1_words < words_to_show) {
 62                         print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32,
 63                                        4, (void *)fp, line1_words << 2, 0);
 64                         fp += line1_words << 2;
 65                         words_to_show -= line1_words;
 66                 }
 67         }
 68         print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32, 4, (void *)fp,
 69                        words_to_show << 2, 0);
 70         pr_info("\n\nCall Trace:\n");
 71         microblaze_unwind(task, NULL);
 72         pr_info("\n");
 73 
 74         if (!task)
 75                 task = current;
 76 
 77         debug_show_held_locks(task);
 78 }
 79 

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