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