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6bf212c89c
In order to reuse the arm64 stack unwinding logic for the nVHE hypervisor stack, move the common code to a shared header (arch/arm64/include/asm/stacktrace/common.h). The nVHE hypervisor cannot safely link against kernel code, so we make use of the shared header to avoid duplicated logic later in this series. Signed-off-by: Kalesh Singh <kaleshsingh@google.com> Reviewed-by: Mark Brown <broonie@kernel.org> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20220726073750.3219117-2-kaleshsingh@google.com
86 lines
2.2 KiB
C
86 lines
2.2 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 <linux/llist.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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#include <asm/stacktrace/common.h>
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extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk,
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const char *loglvl);
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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, unsigned long size,
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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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return on_stack(sp, size, low, high, STACK_TYPE_IRQ, info);
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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, unsigned long size,
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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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return on_stack(sp, size, low, high, STACK_TYPE_TASK, info);
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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, unsigned long size,
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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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return on_stack(sp, size, low, high, STACK_TYPE_OVERFLOW, info);
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}
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#else
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static inline bool on_overflow_stack(unsigned long sp, unsigned long size,
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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, unsigned long size,
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struct stack_info *info)
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{
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if (info)
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info->type = STACK_TYPE_UNKNOWN;
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if (on_task_stack(tsk, sp, size, 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, size, info))
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return true;
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if (on_overflow_stack(sp, size, info))
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return true;
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if (on_sdei_stack(sp, size, 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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