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75 lines
1.8 KiB
75 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
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* Copyright (C) 2013 Richard Weinberger <[email protected]> |
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* Copyright (C) 2014 Google Inc., Author: Daniel Walter <[email protected]> |
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*/ |
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#include <linux/kallsyms.h> |
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#include <linux/kernel.h> |
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#include <linux/sched.h> |
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#include <linux/stacktrace.h> |
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#include <linux/module.h> |
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#include <linux/uaccess.h> |
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#include <asm/stacktrace.h> |
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void dump_trace(struct task_struct *tsk, |
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const struct stacktrace_ops *ops, |
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void *data) |
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{ |
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int reliable = 0; |
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unsigned long *sp, bp, addr; |
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struct pt_regs *segv_regs = tsk->thread.segv_regs; |
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struct stack_frame *frame; |
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bp = get_frame_pointer(tsk, segv_regs); |
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sp = get_stack_pointer(tsk, segv_regs); |
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frame = (struct stack_frame *)bp; |
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while (((long) sp & (THREAD_SIZE-1)) != 0) { |
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addr = *sp; |
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if (__kernel_text_address(addr)) { |
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reliable = 0; |
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if ((unsigned long) sp == bp + sizeof(long)) { |
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frame = frame ? frame->next_frame : NULL; |
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bp = (unsigned long)frame; |
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reliable = 1; |
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} |
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ops->address(data, addr, reliable); |
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} |
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sp++; |
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} |
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} |
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static void save_addr(void *data, unsigned long address, int reliable) |
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{ |
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struct stack_trace *trace = data; |
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if (!reliable) |
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return; |
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if (trace->nr_entries >= trace->max_entries) |
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return; |
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trace->entries[trace->nr_entries++] = address; |
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} |
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static const struct stacktrace_ops dump_ops = { |
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.address = save_addr |
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}; |
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static void __save_stack_trace(struct task_struct *tsk, struct stack_trace *trace) |
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{ |
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dump_trace(tsk, &dump_ops, trace); |
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} |
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void save_stack_trace(struct stack_trace *trace) |
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{ |
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__save_stack_trace(current, 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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__save_stack_trace(tsk, trace); |
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} |
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
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