/* * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> * Copyright (C) 2007-2009 PetaLogix * Copyright (C) 2006 Atmark Techno, Inc. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #include <linux/cpu.h>#include <linux/export.h>#include <linux/kernel.h>#include <linux/kallsyms.h>#include <linux/sched.h>#include <linux/sched/debug.h>#include <linux/debug_locks.h> #include <asm/exceptions.h>#include <asm/unwind.h> void trap_init(void){	__enable_hw_exceptions();} static unsigned long kstack_depth_to_print;	/* 0 == entire stack */ static int __init kstack_setup(char *s){	return !kstrtoul(s, 0, &kstack_depth_to_print);}__setup("kstack=", kstack_setup); void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl){	unsigned long words_to_show;	u32 fp = (u32) sp; 	if (fp == 0) {		if (task) {			fp = ((struct thread_info *)				(task->stack))->cpu_context.r1;		} else {			/* Pick up caller of dump_stack() */			fp = (u32)&sp - 8;		}	} 	words_to_show = (THREAD_SIZE - (fp & (THREAD_SIZE - 1))) >> 2;	if (kstack_depth_to_print && (words_to_show > kstack_depth_to_print))		words_to_show = kstack_depth_to_print; 	printk("%sKernel Stack:\n", loglvl); 	/*	 * Make the first line an 'odd' size if necessary to get	 * remaining lines to start at an address multiple of 0x10	 */	if (fp & 0xF) {		unsigned long line1_words = (0x10 - (fp & 0xF)) >> 2;		if (line1_words < words_to_show) {			print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32,				       4, (void *)fp, line1_words << 2, 0);			fp += line1_words << 2;			words_to_show -= line1_words;		}	}	print_hex_dump(loglvl, "", DUMP_PREFIX_ADDRESS, 32, 4, (void *)fp,		       words_to_show << 2, 0);	printk("%s\n\nCall Trace:\n", loglvl);	microblaze_unwind(task, NULL, loglvl);	printk("%s\n", loglvl); 	if (!task)		task = current; 	debug_show_held_locks(task);}