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