[linux-2.6-block.git] / arch / x86 / include / asm / unwind.h

#ifndef _ASM_X86_UNWIND_H
#define _ASM_X86_UNWIND_H

#include <linux/sched.h>
#include <linux/ftrace.h>
#include <asm/ptrace.h>
#include <asm/stacktrace.h>

struct unwind_state {
	struct stack_info stack_info;
	unsigned long stack_mask;
	struct task_struct *task;
	int graph_idx;
	bool error;
#if defined(CONFIG_UNWINDER_ORC)
	bool signal, full_regs;
	unsigned long sp, bp, ip;
	struct pt_regs *regs;
#elif defined(CONFIG_UNWINDER_FRAME_POINTER)
	bool got_irq;
	unsigned long *bp, *orig_sp, ip;
	struct pt_regs *regs;
#else
	unsigned long *sp;
#endif
};

void __unwind_start(struct unwind_state *state, struct task_struct *task,
		    struct pt_regs *regs, unsigned long *first_frame);
bool unwind_next_frame(struct unwind_state *state);
unsigned long unwind_get_return_address(struct unwind_state *state);
unsigned long *unwind_get_return_address_ptr(struct unwind_state *state);

static inline bool unwind_done(struct unwind_state *state)
{
	return state->stack_info.type == STACK_TYPE_UNKNOWN;
}

static inline bool unwind_error(struct unwind_state *state)
{
	return state->error;
}

static inline
void unwind_start(struct unwind_state *state, struct task_struct *task,
		  struct pt_regs *regs, unsigned long *first_frame)
{
	first_frame = first_frame ? : get_stack_pointer(task, regs);

	__unwind_start(state, task, regs, first_frame);
}

#if defined(CONFIG_UNWINDER_ORC) || defined(CONFIG_UNWINDER_FRAME_POINTER)
static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state)
{
	if (unwind_done(state))
		return NULL;

	return state->regs;
}
#else
static inline struct pt_regs *unwind_get_entry_regs(struct unwind_state *state)
{
	return NULL;
}
#endif

#ifdef CONFIG_UNWINDER_ORC
void unwind_init(void);
void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size,
			void *orc, size_t orc_size);
#else
static inline void unwind_init(void) {}
static inline
void unwind_module_init(struct module *mod, void *orc_ip, size_t orc_ip_size,
			void *orc, size_t orc_size) {}
#endif

/*
 * This disables KASAN checking when reading a value from another task's stack,
 * since the other task could be running on another CPU and could have poisoned
 * the stack in the meantime.
 */
#define READ_ONCE_TASK_STACK(task, x)			\
({							\
	unsigned long val;				\
	if (task == current)				\
		val = READ_ONCE(x);			\
	else						\
		val = READ_ONCE_NOCHECK(x);		\
	val;						\
})

static inline bool task_on_another_cpu(struct task_struct *task)
{
#ifdef CONFIG_SMP
	return task != current && task->on_cpu;
#else
	return false;
#endif
}

#endif /* _ASM_X86_UNWIND_H */
Commit	Line	Data
7c7900f8 JP	1	#ifndef _ASM_X86_UNWIND_H
	2	#define _ASM_X86_UNWIND_H
	3
	4	#include <linux/sched.h>
	5	#include <linux/ftrace.h>
	6	#include <asm/ptrace.h>
	7	#include <asm/stacktrace.h>
	8
	9	struct unwind_state {
	10	struct stack_info stack_info;
	11	unsigned long stack_mask;
	12	struct task_struct *task;
	13	int graph_idx;
af085d90	14	bool error;
11af8474	15	#if defined(CONFIG_UNWINDER_ORC)
ee9f8fce JP	16	bool signal, full_regs;
	17	unsigned long sp, bp, ip;
	18	struct pt_regs *regs;
11af8474	19	#elif defined(CONFIG_UNWINDER_FRAME_POINTER)
a8b7a923	20	bool got_irq;
ee9f8fce	21	unsigned long bp, orig_sp, ip;
946c1911	22	struct pt_regs *regs;
7c7900f8 JP	23	#else
	24	unsigned long *sp;
	25	#endif
	26	};
	27
	28	void __unwind_start(struct unwind_state state, struct task_struct task,
	29	struct pt_regs regs, unsigned long first_frame);
7c7900f8	30	bool unwind_next_frame(struct unwind_state *state);
cfee9edd	31	unsigned long unwind_get_return_address(struct unwind_state *state);
ee9f8fce	32	unsigned long unwind_get_return_address_ptr(struct unwind_state state);
cfee9edd	33
7c7900f8 JP	34	static inline bool unwind_done(struct unwind_state *state)
	35	{
	36	return state->stack_info.type == STACK_TYPE_UNKNOWN;
	37	}
	38
af085d90 JP	39	static inline bool unwind_error(struct unwind_state *state)
	40	{
	41	return state->error;
	42	}
	43
7c7900f8	44	static inline
ee9f8fce JP	45	void unwind_start(struct unwind_state state, struct task_struct task,
ee9f8fce JP	46	struct pt_regs regs, unsigned long first_frame)
7c7900f8	47	{
ee9f8fce	48	first_frame = first_frame ? : get_stack_pointer(task, regs);
7c7900f8	49
ee9f8fce	50	__unwind_start(state, task, regs, first_frame);
946c1911 JP	51	}
946c1911 JP	52
11af8474	53	#if defined(CONFIG_UNWINDER_ORC) \|\| defined(CONFIG_UNWINDER_FRAME_POINTER)
946c1911 JP	54	static inline struct pt_regs unwind_get_entry_regs(struct unwind_state state)
	55	{
	56	if (unwind_done(state))
	57	return NULL;
	58
	59	return state->regs;
7c7900f8	60	}
ee9f8fce JP	61	#else
ee9f8fce JP	62	static inline struct pt_regs unwind_get_entry_regs(struct unwind_state state)
7c7900f8 JP	63	{
	64	return NULL;
	65	}
ee9f8fce	66	#endif
7c7900f8	67
11af8474	68	#ifdef CONFIG_UNWINDER_ORC
ee9f8fce JP	69	void unwind_init(void);
	70	void unwind_module_init(struct module mod, void orc_ip, size_t orc_ip_size,
	71	void *orc, size_t orc_size);
	72	#else
	73	static inline void unwind_init(void) {}
	74	static inline
	75	void unwind_module_init(struct module mod, void orc_ip, size_t orc_ip_size,
	76	void *orc, size_t orc_size) {}
	77	#endif
	78
	79	/*
	80	* This disables KASAN checking when reading a value from another task's stack,
	81	* since the other task could be running on another CPU and could have poisoned
	82	* the stack in the meantime.
	83	*/
	84	#define READ_ONCE_TASK_STACK(task, x) \
	85	({ \
	86	unsigned long val; \
	87	if (task == current) \
	88	val = READ_ONCE(x); \
	89	else \
	90	val = READ_ONCE_NOCHECK(x); \
	91	val; \
	92	})
	93
	94	static inline bool task_on_another_cpu(struct task_struct *task)
946c1911	95	{
ee9f8fce JP	96	#ifdef CONFIG_SMP
	97	return task != current && task->on_cpu;
	98	#else
	99	return false;
	100	#endif
946c1911 JP	101	}
946c1911 JP	102
7c7900f8	103	#endif /* _ASM_X86_UNWIND_H */