165bc6093SMichal Simek /*
265bc6093SMichal Simek * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
365bc6093SMichal Simek * Copyright (C) 2007-2009 PetaLogix
465bc6093SMichal Simek * Copyright (C) 2006 Atmark Techno, Inc.
565bc6093SMichal Simek *
665bc6093SMichal Simek * This file is subject to the terms and conditions of the GNU General Public
765bc6093SMichal Simek * License. See the file "COPYING" in the main directory of this archive
865bc6093SMichal Simek * for more details.
965bc6093SMichal Simek */
1065bc6093SMichal Simek
11d64af918SMichal Simek #include <linux/export.h>
1265bc6093SMichal Simek #include <linux/kernel.h>
1365bc6093SMichal Simek #include <linux/kallsyms.h>
1465bc6093SMichal Simek #include <linux/sched.h>
15b17b0153SIngo Molnar #include <linux/sched/debug.h>
1665bc6093SMichal Simek #include <linux/debug_locks.h>
1765bc6093SMichal Simek
1865bc6093SMichal Simek #include <asm/exceptions.h>
19ce3266c0SSteven J. Magnani #include <asm/unwind.h>
2065bc6093SMichal Simek
trap_init(void)2165bc6093SMichal Simek void trap_init(void)
2265bc6093SMichal Simek {
2365bc6093SMichal Simek __enable_hw_exceptions();
2465bc6093SMichal Simek }
2565bc6093SMichal Simek
26ce3266c0SSteven J. Magnani static unsigned long kstack_depth_to_print; /* 0 == entire stack */
2765bc6093SMichal Simek
kstack_setup(char * s)2865bc6093SMichal Simek static int __init kstack_setup(char *s)
2965bc6093SMichal Simek {
306bd55f0bSMichal Simek return !kstrtoul(s, 0, &kstack_depth_to_print);
3165bc6093SMichal Simek }
3265bc6093SMichal Simek __setup("kstack=", kstack_setup);
3365bc6093SMichal Simek
show_stack(struct task_struct * task,unsigned long * sp,const char * loglvl)34*9cb8f069SDmitry Safonov void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl)
3565bc6093SMichal Simek {
36ce3266c0SSteven J. Magnani unsigned long words_to_show;
37ce3266c0SSteven J. Magnani u32 fp = (u32) sp;
3865bc6093SMichal Simek
39ce3266c0SSteven J. Magnani if (fp == 0) {
40ce3266c0SSteven J. Magnani if (task) {
41ce3266c0SSteven J. Magnani fp = ((struct thread_info *)
42ce3266c0SSteven J. Magnani (task->stack))->cpu_context.r1;
43ce3266c0SSteven J. Magnani } else {
44ce3266c0SSteven J. Magnani /* Pick up caller of dump_stack() */
45ce3266c0SSteven J. Magnani fp = (u32)&sp - 8;
4665bc6093SMichal Simek }
47ce3266c0SSteven J. Magnani }
48ce3266c0SSteven J. Magnani
49ce3266c0SSteven J. Magnani words_to_show = (THREAD_SIZE - (fp & (THREAD_SIZE - 1))) >> 2;
50ce3266c0SSteven J. Magnani if (kstack_depth_to_print && (words_to_show > kstack_depth_to_print))
51ce3266c0SSteven J. Magnani words_to_show = kstack_depth_to_print;
52ce3266c0SSteven J. Magnani
5335f3968bSDmitry Safonov printk("%sKernel Stack:\n", loglvl);
54ce3266c0SSteven J. Magnani
55ce3266c0SSteven J. Magnani /*
56ce3266c0SSteven J. Magnani * Make the first line an 'odd' size if necessary to get
57ce3266c0SSteven J. Magnani * remaining lines to start at an address multiple of 0x10
58ce3266c0SSteven J. Magnani */
59ce3266c0SSteven J. Magnani if (fp & 0xF) {
60ce3266c0SSteven J. Magnani unsigned long line1_words = (0x10 - (fp & 0xF)) >> 2;
61ce3266c0SSteven J. Magnani if (line1_words < words_to_show) {
62ce3266c0SSteven J. Magnani print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32,
63ce3266c0SSteven J. Magnani 4, (void *)fp, line1_words << 2, 0);
64ce3266c0SSteven J. Magnani fp += line1_words << 2;
65ce3266c0SSteven J. Magnani words_to_show -= line1_words;
66ce3266c0SSteven J. Magnani }
67ce3266c0SSteven J. Magnani }
6835f3968bSDmitry Safonov print_hex_dump(loglvl, "", DUMP_PREFIX_ADDRESS, 32, 4, (void *)fp,
69ce3266c0SSteven J. Magnani words_to_show << 2, 0);
7035f3968bSDmitry Safonov printk("%s\n\nCall Trace:\n", loglvl);
7135f3968bSDmitry Safonov microblaze_unwind(task, NULL, loglvl);
7235f3968bSDmitry Safonov printk("%s\n", loglvl);
7365bc6093SMichal Simek
7465bc6093SMichal Simek if (!task)
7565bc6093SMichal Simek task = current;
7665bc6093SMichal Simek
7765bc6093SMichal Simek debug_show_held_locks(task);
7865bc6093SMichal Simek }
79