f3dcbe67ed
Some common code is required by each stacktrace user to initialise struct stackframe before the first call to unwind_frame(). In preparation for adding to the common code, this patch factors it out into a separate function start_backtrace(), and modifies the stacktrace callers appropriately. No functional change. Signed-off-by: Dave Martin <dave.martin@arm.com> [Mark: drop tsk argument, update more callsites] Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: James Morse <james.morse@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
145 lines
3.0 KiB
C
145 lines
3.0 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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static inline void start_backtrace(struct stackframe *frame,
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unsigned long fp, unsigned long pc)
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{
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frame->fp = fp;
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frame->pc = pc;
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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frame->graph = 0;
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#endif
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}
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#endif /* __ASM_STACKTRACE_H */
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