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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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ce3266c047
Implement intelligent backtracing by searching for stack frame creation, and emitting only return addresses. Use print_hex_dump() to display the entire binary kernel stack. Limitation: MMU kernels are not currently able to trace beyond a system trap (interrupt, syscall, etc.). It is the intent of this patch to provide infrastructure that can be extended to add this capability later. Changes from V1: * Removed checks in find_frame_creation() that prevented location of the frame creation instruction in heavily optimized code * Various formatting/commenting/file location tweaks per review comments * Dropped Kconfig option to enable STACKTRACE as something logically separate Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
/*
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* Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2007-2009 PetaLogix
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/kallsyms.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/debug_locks.h>
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#include <asm/exceptions.h>
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#include <asm/system.h>
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#include <asm/unwind.h>
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void trap_init(void)
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{
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__enable_hw_exceptions();
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}
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static unsigned long kstack_depth_to_print; /* 0 == entire stack */
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static int __init kstack_setup(char *s)
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{
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return !strict_strtoul(s, 0, &kstack_depth_to_print);
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}
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__setup("kstack=", kstack_setup);
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void show_stack(struct task_struct *task, unsigned long *sp)
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{
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unsigned long words_to_show;
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u32 fp = (u32) sp;
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if (fp == 0) {
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if (task) {
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fp = ((struct thread_info *)
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(task->stack))->cpu_context.r1;
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} else {
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/* Pick up caller of dump_stack() */
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fp = (u32)&sp - 8;
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}
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}
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words_to_show = (THREAD_SIZE - (fp & (THREAD_SIZE - 1))) >> 2;
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if (kstack_depth_to_print && (words_to_show > kstack_depth_to_print))
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words_to_show = kstack_depth_to_print;
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pr_info("Kernel Stack:\n");
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/*
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* Make the first line an 'odd' size if necessary to get
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* remaining lines to start at an address multiple of 0x10
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*/
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if (fp & 0xF) {
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unsigned long line1_words = (0x10 - (fp & 0xF)) >> 2;
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if (line1_words < words_to_show) {
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print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32,
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4, (void *)fp, line1_words << 2, 0);
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fp += line1_words << 2;
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words_to_show -= line1_words;
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}
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}
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print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32, 4, (void *)fp,
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words_to_show << 2, 0);
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printk(KERN_INFO "\n\n");
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pr_info("Call Trace:\n");
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microblaze_unwind(task, NULL);
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pr_info("\n");
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if (!task)
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task = current;
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debug_show_held_locks(task);
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}
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void dump_stack(void)
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{
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show_stack(NULL, NULL);
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}
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EXPORT_SYMBOL(dump_stack);
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