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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * Copyright (C) 2013 Richard Weinberger <richard@nod.at> * Copyright (C) 2014 Google Inc., Author: Daniel Walter <dwalter@google.com> */
#include <linux/kallsyms.h>#include <linux/kernel.h>#include <linux/sched.h>#include <linux/stacktrace.h>#include <linux/module.h>#include <linux/uaccess.h>#include <asm/stacktrace.h>
void dump_trace(struct task_struct *tsk, const struct stacktrace_ops *ops, void *data){ int reliable = 0; unsigned long *sp, bp, addr; struct pt_regs *segv_regs = tsk->thread.segv_regs; struct stack_frame *frame;
bp = get_frame_pointer(tsk, segv_regs); sp = get_stack_pointer(tsk, segv_regs);
frame = (struct stack_frame *)bp; while (((long) sp & (THREAD_SIZE-1)) != 0) { addr = READ_ONCE_NOCHECK(*sp); if (__kernel_text_address(addr)) { reliable = 0; if ((unsigned long) sp == bp + sizeof(long)) { frame = frame ? frame->next_frame : NULL; bp = (unsigned long)frame; reliable = 1; } ops->address(data, addr, reliable); } sp++; }}
static void save_addr(void *data, unsigned long address, int reliable){ struct stack_trace *trace = data;
if (!reliable) return; if (trace->nr_entries >= trace->max_entries) return;
trace->entries[trace->nr_entries++] = address;}
static const struct stacktrace_ops dump_ops = { .address = save_addr};
static void __save_stack_trace(struct task_struct *tsk, struct stack_trace *trace){ dump_trace(tsk, &dump_ops, trace);}
void save_stack_trace(struct stack_trace *trace){ __save_stack_trace(current, trace);}EXPORT_SYMBOL_GPL(save_stack_trace);
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace){ __save_stack_trace(tsk, trace);}EXPORT_SYMBOL_GPL(save_stack_trace_tsk);