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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_SCHED_TASK_STACK_H#define _LINUX_SCHED_TASK_STACK_H
/* * task->stack (kernel stack) handling interfaces: */
#include <linux/sched.h>#include <linux/magic.h>#include <linux/refcount.h>#include <linux/kasan.h>
#ifdef CONFIG_THREAD_INFO_IN_TASK
/* * When accessing the stack of a non-current task that might exit, use * try_get_task_stack() instead. task_stack_page will return a pointer * that could get freed out from under you. */static __always_inline void *task_stack_page(const struct task_struct *task){ return task->stack;}
#define setup_thread_stack(new,old) do { } while(0)
static __always_inline unsigned long *end_of_stack(const struct task_struct *task){#ifdef CONFIG_STACK_GROWSUP return (unsigned long *)((unsigned long)task->stack + THREAD_SIZE) - 1;#else return task->stack;#endif}
#else
#define task_stack_page(task) ((void *)(task)->stack)
static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org){ *task_thread_info(p) = *task_thread_info(org); task_thread_info(p)->task = p;}
/* * Return the address of the last usable long on the stack. * * When the stack grows down, this is just above the thread * info struct. Going any lower will corrupt the threadinfo. * * When the stack grows up, this is the highest address. * Beyond that position, we corrupt data on the next page. */static inline unsigned long *end_of_stack(const struct task_struct *p){#ifdef CONFIG_STACK_GROWSUP return (unsigned long *)((unsigned long)task_thread_info(p) + THREAD_SIZE) - 1;#else return (unsigned long *)(task_thread_info(p) + 1);#endif}
#endif
#ifdef CONFIG_THREAD_INFO_IN_TASKstatic inline void *try_get_task_stack(struct task_struct *tsk){ return refcount_inc_not_zero(&tsk->stack_refcount) ? task_stack_page(tsk) : NULL;}
extern void put_task_stack(struct task_struct *tsk);#elsestatic inline void *try_get_task_stack(struct task_struct *tsk){ return task_stack_page(tsk);}
static inline void put_task_stack(struct task_struct *tsk) {}#endif
void exit_task_stack_account(struct task_struct *tsk);
#define task_stack_end_corrupted(task) \ (*(end_of_stack(task)) != STACK_END_MAGIC)
static inline int object_is_on_stack(const void *obj){ void *stack = task_stack_page(current);
obj = kasan_reset_tag(obj); return (obj >= stack) && (obj < (stack + THREAD_SIZE));}
extern void thread_stack_cache_init(void);
#ifdef CONFIG_DEBUG_STACK_USAGEunsigned long stack_not_used(struct task_struct *p);#elsestatic inline unsigned long stack_not_used(struct task_struct *p){ return 0;}#endifextern void set_task_stack_end_magic(struct task_struct *tsk);
static inline int kstack_end(void *addr){ /* Reliable end of stack detection: * Some APM bios versions misalign the stack */ return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));}
#endif /* _LINUX_SCHED_TASK_STACK_H */