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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 503 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
134 lines
2.7 KiB
C
134 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 ARM Ltd.
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*/
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#ifndef __ASM_STACKTRACE_H
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#define __ASM_STACKTRACE_H
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#include <linux/percpu.h>
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#include <linux/sched.h>
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#include <linux/sched/task_stack.h>
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#include <asm/memory.h>
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#include <asm/ptrace.h>
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#include <asm/sdei.h>
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struct stackframe {
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unsigned long fp;
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unsigned long pc;
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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int graph;
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#endif
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};
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enum stack_type {
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STACK_TYPE_UNKNOWN,
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STACK_TYPE_TASK,
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STACK_TYPE_IRQ,
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STACK_TYPE_OVERFLOW,
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STACK_TYPE_SDEI_NORMAL,
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STACK_TYPE_SDEI_CRITICAL,
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};
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struct stack_info {
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unsigned long low;
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unsigned long high;
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enum stack_type type;
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};
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extern int unwind_frame(struct task_struct *tsk, struct stackframe *frame);
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extern void walk_stackframe(struct task_struct *tsk, struct stackframe *frame,
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int (*fn)(struct stackframe *, void *), void *data);
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extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk);
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DECLARE_PER_CPU(unsigned long *, irq_stack_ptr);
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static inline bool on_irq_stack(unsigned long sp,
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struct stack_info *info)
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{
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unsigned long low = (unsigned long)raw_cpu_read(irq_stack_ptr);
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unsigned long high = low + IRQ_STACK_SIZE;
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if (!low)
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return false;
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if (sp < low || sp >= high)
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return false;
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if (info) {
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info->low = low;
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info->high = high;
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info->type = STACK_TYPE_IRQ;
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}
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return true;
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}
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static inline bool on_task_stack(struct task_struct *tsk, unsigned long sp,
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struct stack_info *info)
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{
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unsigned long low = (unsigned long)task_stack_page(tsk);
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unsigned long high = low + THREAD_SIZE;
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if (sp < low || sp >= high)
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return false;
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if (info) {
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info->low = low;
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info->high = high;
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info->type = STACK_TYPE_TASK;
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}
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return true;
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}
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#ifdef CONFIG_VMAP_STACK
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DECLARE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack);
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static inline bool on_overflow_stack(unsigned long sp,
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struct stack_info *info)
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{
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unsigned long low = (unsigned long)raw_cpu_ptr(overflow_stack);
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unsigned long high = low + OVERFLOW_STACK_SIZE;
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if (sp < low || sp >= high)
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return false;
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if (info) {
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info->low = low;
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info->high = high;
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info->type = STACK_TYPE_OVERFLOW;
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}
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return true;
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}
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#else
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static inline bool on_overflow_stack(unsigned long sp,
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struct stack_info *info) { return false; }
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#endif
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/*
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* We can only safely access per-cpu stacks from current in a non-preemptible
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* context.
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*/
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static inline bool on_accessible_stack(struct task_struct *tsk,
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unsigned long sp,
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struct stack_info *info)
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{
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if (on_task_stack(tsk, sp, info))
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return true;
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if (tsk != current || preemptible())
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return false;
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if (on_irq_stack(sp, info))
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return true;
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if (on_overflow_stack(sp, info))
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return true;
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if (on_sdei_stack(sp, info))
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return true;
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return false;
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}
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#endif /* __ASM_STACKTRACE_H */
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