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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253// SPDX-License-Identifier: GPL-2.0-only/* * Stacktrace support for Hexagon * * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. */
#include <linux/sched.h>#include <linux/sched/task_stack.h>#include <linux/stacktrace.h>#include <linux/thread_info.h>#include <linux/module.h>
struct stackframe { unsigned long fp; unsigned long rets;};
/* * Save stack-backtrace addresses into a stack_trace buffer. */void save_stack_trace(struct stack_trace *trace){ unsigned long low, high; unsigned long fp; struct stackframe *frame; int skip = trace->skip;
low = (unsigned long)task_stack_page(current); high = low + THREAD_SIZE; fp = (unsigned long)__builtin_frame_address(0);
while (fp >= low && fp <= (high - sizeof(*frame))) { frame = (struct stackframe *)fp;
if (skip) { skip--; } else { trace->entries[trace->nr_entries++] = frame->rets; if (trace->nr_entries >= trace->max_entries) break; }
/* * The next frame must be at a higher address than the * current frame. */ low = fp + sizeof(*frame); fp = frame->fp; }}EXPORT_SYMBOL_GPL(save_stack_trace);