root/include/linux/stacktrace.h

INCLUDED FROM

DEFINITIONS

1. stack_trace_save_tsk_reliable

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __LINUX_STACKTRACE_H
   3 #define __LINUX_STACKTRACE_H
   4 
   5 #include <linux/types.h>
   6 #include <asm/errno.h>
   7 
   8 struct task_struct;
   9 struct pt_regs;
  10 
  11 #ifdef CONFIG_STACKTRACE
  12 void stack_trace_print(const unsigned long *trace, unsigned int nr_entries,
  13                        int spaces);
  14 int stack_trace_snprint(char *buf, size_t size, const unsigned long *entries,
  15                         unsigned int nr_entries, int spaces);
  16 unsigned int stack_trace_save(unsigned long *store, unsigned int size,
  17                               unsigned int skipnr);
  18 unsigned int stack_trace_save_tsk(struct task_struct *task,
  19                                   unsigned long *store, unsigned int size,
  20                                   unsigned int skipnr);
  21 unsigned int stack_trace_save_regs(struct pt_regs *regs, unsigned long *store,
  22                                    unsigned int size, unsigned int skipnr);
  23 unsigned int stack_trace_save_user(unsigned long *store, unsigned int size);
  24 
  25 /* Internal interfaces. Do not use in generic code */
  26 #ifdef CONFIG_ARCH_STACKWALK
  27 
  28 /**
  29  * stack_trace_consume_fn - Callback for arch_stack_walk()
  30  * @cookie:     Caller supplied pointer handed back by arch_stack_walk()
  31  * @addr:       The stack entry address to consume
  32  * @reliable:   True when the stack entry is reliable. Required by
  33  *              some printk based consumers.
  34  *
  35  * Return:      True, if the entry was consumed or skipped
  36  *              False, if there is no space left to store
  37  */
  38 typedef bool (*stack_trace_consume_fn)(void *cookie, unsigned long addr,
  39                                        bool reliable);
  40 /**
  41  * arch_stack_walk - Architecture specific function to walk the stack
  42  * @consume_entry:      Callback which is invoked by the architecture code for
  43  *                      each entry.
  44  * @cookie:             Caller supplied pointer which is handed back to
  45  *                      @consume_entry
  46  * @task:               Pointer to a task struct, can be NULL
  47  * @regs:               Pointer to registers, can be NULL
  48  *
  49  * ============ ======= ============================================
  50  * task         regs
  51  * ============ ======= ============================================
  52  * task         NULL    Stack trace from task (can be current)
  53  * current      regs    Stack trace starting on regs->stackpointer
  54  * ============ ======= ============================================
  55  */
  56 void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
  57                      struct task_struct *task, struct pt_regs *regs);
  58 int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, void *cookie,
  59                              struct task_struct *task);
  60 void arch_stack_walk_user(stack_trace_consume_fn consume_entry, void *cookie,
  61                           const struct pt_regs *regs);
  62 
  63 #else /* CONFIG_ARCH_STACKWALK */
  64 struct stack_trace {
  65         unsigned int nr_entries, max_entries;
  66         unsigned long *entries;
  67         int skip;       /* input argument: How many entries to skip */
  68 };
  69 
  70 extern void save_stack_trace(struct stack_trace *trace);
  71 extern void save_stack_trace_regs(struct pt_regs *regs,
  72                                   struct stack_trace *trace);
  73 extern void save_stack_trace_tsk(struct task_struct *tsk,
  74                                 struct stack_trace *trace);
  75 extern int save_stack_trace_tsk_reliable(struct task_struct *tsk,
  76                                          struct stack_trace *trace);
  77 extern void save_stack_trace_user(struct stack_trace *trace);
  78 #endif /* !CONFIG_ARCH_STACKWALK */
  79 #endif /* CONFIG_STACKTRACE */
  80 
  81 #if defined(CONFIG_STACKTRACE) && defined(CONFIG_HAVE_RELIABLE_STACKTRACE)
  82 int stack_trace_save_tsk_reliable(struct task_struct *tsk, unsigned long *store,
  83                                   unsigned int size);
  84 #else
  85 static inline int stack_trace_save_tsk_reliable(struct task_struct *tsk,
  86                                                 unsigned long *store,
  87                                                 unsigned int size)
  88 {
  89         return -ENOSYS;
  90 }
  91 #endif
  92 
  93 #endif /* __LINUX_STACKTRACE_H */