73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_SW64_STACKTRACE_H
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#define _ASM_SW64_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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struct stackframe {
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unsigned long pc;
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unsigned long fp;
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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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};
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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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/* The form of the top of the frame on the stack */
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struct stack_frame {
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unsigned long return_address;
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struct stack_frame *next_frame;
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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 pt_regs *regs,
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int (*fn)(unsigned long, void *), void *data);
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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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/*
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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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return false;
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}
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#endif /* _ASM_SW64_STACKTRACE_H */
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