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>
32 lines
822 B
C
32 lines
822 B
C
/*
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* Stack trace support for Microblaze.
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*
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* Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2009 PetaLogix
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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/sched.h>
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#include <linux/stacktrace.h>
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#include <linux/thread_info.h>
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#include <linux/ptrace.h>
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#include <linux/module.h>
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#include <asm/unwind.h>
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void save_stack_trace(struct stack_trace *trace)
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{
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/* Exclude our helper functions from the trace*/
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trace->skip += 2;
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microblaze_unwind(NULL, trace);
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}
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EXPORT_SYMBOL_GPL(save_stack_trace);
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void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
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{
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microblaze_unwind(tsk, trace);
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}
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
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