// 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> register unsigned long current_frame_pointer asm("r30"); 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 = current_frame_pointer; 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);