1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * Copyright (C) 2012 ARM Ltd.
  4 */
  5#ifndef __ASM_STACKTRACE_H
  6#define __ASM_STACKTRACE_H
  7
  8#include <linux/percpu.h>
  9#include <linux/sched.h>
 10#include <linux/sched/task_stack.h>
 11#include <linux/llist.h>
 12
 13#include <asm/memory.h>
 14#include <asm/pointer_auth.h>
 15#include <asm/ptrace.h>
 16#include <asm/sdei.h>
 17
 18#include <asm/stacktrace/common.h>
 19
 20extern void dump_backtrace(struct pt_regs *regs, struct task_struct *tsk,
 21			   const char *loglvl);
 22
 23DECLARE_PER_CPU(unsigned long *, irq_stack_ptr);
 24
 25static inline struct stack_info stackinfo_get_irq(void)
 26{
 27	unsigned long low = (unsigned long)raw_cpu_read(irq_stack_ptr);
 28	unsigned long high = low + IRQ_STACK_SIZE;
 29
 30	return (struct stack_info) {
 31		.low = low,
 32		.high = high,
 33	};
 34}
 35
 36static inline bool on_irq_stack(unsigned long sp, unsigned long size)
 37{
 38	struct stack_info info = stackinfo_get_irq();
 39	return stackinfo_on_stack(&info, sp, size);
 40}
 41
 42static inline struct stack_info stackinfo_get_task(const struct task_struct *tsk)
 43{
 44	unsigned long low = (unsigned long)task_stack_page(tsk);
 45	unsigned long high = low + THREAD_SIZE;
 46
 47	return (struct stack_info) {
 48		.low = low,
 49		.high = high,
 50	};
 51}
 52
 53static inline bool on_task_stack(const struct task_struct *tsk,
 54				 unsigned long sp, unsigned long size)
 55{
 56	struct stack_info info = stackinfo_get_task(tsk);
 57	return stackinfo_on_stack(&info, sp, size);
 58}
 59
 60#define on_thread_stack()	(on_task_stack(current, current_stack_pointer, 1))
 61
 62#ifdef CONFIG_VMAP_STACK
 63DECLARE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack);
 64
 65static inline struct stack_info stackinfo_get_overflow(void)
 66{
 67	unsigned long low = (unsigned long)raw_cpu_ptr(overflow_stack);
 68	unsigned long high = low + OVERFLOW_STACK_SIZE;
 69
 70	return (struct stack_info) {
 71		.low = low,
 72		.high = high,
 73	};
 74}
 75#else
 76#define stackinfo_get_overflow()	stackinfo_get_unknown()
 77#endif
 78
 79#if defined(CONFIG_ARM_SDE_INTERFACE) && defined(CONFIG_VMAP_STACK)
 80DECLARE_PER_CPU(unsigned long *, sdei_stack_normal_ptr);
 81DECLARE_PER_CPU(unsigned long *, sdei_stack_critical_ptr);
 82
 83static inline struct stack_info stackinfo_get_sdei_normal(void)
 84{
 85	unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_normal_ptr);
 86	unsigned long high = low + SDEI_STACK_SIZE;
 87
 88	return (struct stack_info) {
 89		.low = low,
 90		.high = high,
 91	};
 92}
 93
 94static inline struct stack_info stackinfo_get_sdei_critical(void)
 95{
 96	unsigned long low = (unsigned long)raw_cpu_read(sdei_stack_critical_ptr);
 97	unsigned long high = low + SDEI_STACK_SIZE;
 98
 99	return (struct stack_info) {
100		.low = low,
101		.high = high,
102	};
103}
104#else
105#define stackinfo_get_sdei_normal()	stackinfo_get_unknown()
106#define stackinfo_get_sdei_critical()	stackinfo_get_unknown()
107#endif
108
109#ifdef CONFIG_EFI
110extern u64 *efi_rt_stack_top;
111
112static inline struct stack_info stackinfo_get_efi(void)
113{
114	unsigned long high = (u64)efi_rt_stack_top;
115	unsigned long low = high - THREAD_SIZE;
116
117	return (struct stack_info) {
118		.low = low,
119		.high = high,
120	};
121}
122#endif
123
124#endif	/* __ASM_STACKTRACE_H */