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https://github.com/Fishwaldo/linux-bl808.git
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8caa6e2be7
on_accessible_stack() and on_task_stack() shouldn't (and don't) modify their task argument, so it can be const. This patch adds the appropriate modifiers. Whitespace violations in the parameter lists are fixed at the same time. No functional change. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Dave Martin <dave.martin@arm.com> [Mark: fixup const location, whitespace] Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
134 lines
2.8 KiB
C
134 lines
2.8 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(const 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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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(const 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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