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linux-headers-6.8.0-83
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stacktrace.h
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __LINUX_STACKTRACE_H #define __LINUX_STACKTRACE_H #include <linux/types.h> #include <asm/errno.h> struct task_struct; struct pt_regs; #ifdef CONFIG_ARCH_STACKWALK /** * stack_trace_consume_fn - Callback for arch_stack_walk() * @cookie: Caller supplied pointer handed back by arch_stack_walk() * @addr: The stack entry address to consume * * Return: True, if the entry was consumed or skipped * False, if there is no space left to store */ typedef bool (*stack_trace_consume_fn)(void *cookie, unsigned long addr); /** * arch_stack_walk - Architecture specific function to walk the stack * @consume_entry: Callback which is invoked by the architecture code for * each entry. * @cookie: Caller supplied pointer which is handed back to * @consume_entry * @task: Pointer to a task struct, can be NULL * @regs: Pointer to registers, can be NULL * * ============ ======= ============================================ * task regs * ============ ======= ============================================ * task NULL Stack trace from task (can be current) * current regs Stack trace starting on regs->stackpointer * ============ ======= ============================================ */ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie, struct task_struct *task, struct pt_regs *regs); /** * arch_stack_walk_reliable - Architecture specific function to walk the * stack reliably * * @consume_entry: Callback which is invoked by the architecture code for * each entry. * @cookie: Caller supplied pointer which is handed back to * @consume_entry * @task: Pointer to a task struct, can be NULL * * This function returns an error if it detects any unreliable * features of the stack. Otherwise it guarantees that the stack * trace is reliable. * * If the task is not 'current', the caller *must* ensure the task is * inactive and its stack is pinned. */ int arch_stack_walk_reliable(stack_trace_consume_fn consume_entry, void *cookie, struct task_struct *task); void arch_stack_walk_user(stack_trace_consume_fn consume_entry, void *cookie, const struct pt_regs *regs); #endif /* CONFIG_ARCH_STACKWALK */ #ifdef CONFIG_STACKTRACE void stack_trace_print(const unsigned long *trace, unsigned int nr_entries, int spaces); int stack_trace_snprint(char *buf, size_t size, const unsigned long *entries, unsigned int nr_entries, int spaces); unsigned int stack_trace_save(unsigned long *store, unsigned int size, unsigned int skipnr); unsigned int stack_trace_save_tsk(struct task_struct *task, unsigned long *store, unsigned int size, unsigned int skipnr); unsigned int stack_trace_save_regs(struct pt_regs *regs, unsigned long *store, unsigned int size, unsigned int skipnr); unsigned int stack_trace_save_user(unsigned long *store, unsigned int size); unsigned int filter_irq_stacks(unsigned long *entries, unsigned int nr_entries); #ifndef CONFIG_ARCH_STACKWALK /* Internal interfaces. Do not use in generic code */ struct stack_trace { unsigned int nr_entries, max_entries; unsigned long *entries; unsigned int skip; /* input argument: How many entries to skip */ }; extern void save_stack_trace(struct stack_trace *trace); extern void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace); extern void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace); extern int save_stack_trace_tsk_reliable(struct task_struct *tsk, struct stack_trace *trace); extern void save_stack_trace_user(struct stack_trace *trace); #endif /* !CONFIG_ARCH_STACKWALK */ #endif /* CONFIG_STACKTRACE */ #if defined(CONFIG_STACKTRACE) && defined(CONFIG_HAVE_RELIABLE_STACKTRACE) int stack_trace_save_tsk_reliable(struct task_struct *tsk, unsigned long *store, unsigned int size); #else static inline int stack_trace_save_tsk_reliable(struct task_struct *tsk, unsigned long *store, unsigned int size) { return -ENOSYS; } #endif #endif /* __LINUX_STACKTRACE_H */
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