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#ifndef _ASM_IA64_UNWIND_H

#define _ASM_IA64_UNWIND_H

/*

 * Copyright (C) 1999-2000, 2003 Hewlett-Packard Co

 *      David Mosberger-Tang <davidm@hpl.hp.com>

 *

 * A simple API for unwinding kernel stacks.  This is used for

 * debugging and error reporting purposes.  The kernel doesn't need

 * full-blown stack unwinding with all the bells and whitles, so there

 * is not much point in implementing the full IA-64 unwind API (though

 * it would of course be possible to implement the kernel API on top

 * of it).

 */

struct task_struct;     /* forward declaration */

struct switch_stack;    /* forward declaration */

enum unw_application_register {

        UNW_AR_BSP,

        UNW_AR_BSPSTORE,

        UNW_AR_PFS,

        UNW_AR_RNAT,

        UNW_AR_UNAT,

        UNW_AR_LC,

        UNW_AR_EC,

        UNW_AR_FPSR,

        UNW_AR_RSC,

        UNW_AR_CCV,

        UNW_AR_CSD,

        UNW_AR_SSD

};

/*

 * The following declarations are private to the unwind

 * implementation:

 */

struct unw_stack {

        unsigned long limit;

        unsigned long top;

};

#define UNW_FLAG_INTERRUPT_FRAME        (1UL << 0)

/*

 * No user of this module should every access this structure directly

 * as it is subject to change.  It is declared here solely so we can

 * use automatic variables.

 */

struct unw_frame_info {

        struct unw_stack regstk;

        struct unw_stack memstk;

        unsigned int flags;

        short hint;

        short prev_script;

        /* current frame info: */

        unsigned long bsp;              /* backing store pointer value */

        unsigned long sp;               /* stack pointer value */

        unsigned long psp;              /* previous sp value */

        unsigned long ip;               /* instruction pointer value */

        unsigned long pr;               /* current predicate values */

        unsigned long *cfm_loc;         /* cfm save location (or NULL) */

        unsigned long pt;               /* struct pt_regs location */

        struct task_struct *task;

        struct switch_stack *sw;

        /* preserved state: */

        unsigned long *bsp_loc;         /* previous bsp save location */

        unsigned long *bspstore_loc;

        unsigned long *pfs_loc;

        unsigned long *rnat_loc;

        unsigned long *rp_loc;

        unsigned long *pri_unat_loc;

        unsigned long *unat_loc;

        unsigned long *pr_loc;

        unsigned long *lc_loc;

        unsigned long *fpsr_loc;

        struct unw_ireg {

                unsigned long *loc;

                struct unw_ireg_nat {

                        long type : 3;                  /* enum unw_nat_type */

                        signed long off : 61;           /* NaT word is at loc+nat.off */

                } nat;

        } r4, r5, r6, r7;

        unsigned long *b1_loc, *b2_loc, *b3_loc, *b4_loc, *b5_loc;

        struct ia64_fpreg *f2_loc, *f3_loc, *f4_loc, *f5_loc, *fr_loc[16];

};

/*

 * The official API follows below:

 */

struct unw_table_entry {

        u64 start_offset;

        u64 end_offset;

        u64 info_offset;

};

/*

 * Initialize unwind support.

 */

extern void unw_init (void);

extern void unw_create_gate_table (void);

extern void *unw_add_unwind_table (const char *name, unsigned long segment_base, unsigned long gp,

                                   const void *table_start, const void *table_end);

extern void unw_remove_unwind_table (void *handle);

/*

 * Prepare to unwind blocked task t.

 */

extern void unw_init_from_blocked_task (struct unw_frame_info *info, struct task_struct *t);

/*

 * Prepare to unwind from interruption.  The pt-regs and switch-stack structures must have

 * be "adjacent" (no state modifications between pt-regs and switch-stack).

 */

extern void unw_init_from_interruption (struct unw_frame_info *info, struct task_struct *t,

                                        struct pt_regs *pt, struct switch_stack *sw);

extern void unw_init_frame_info (struct unw_frame_info *info, struct task_struct *t,

                                 struct switch_stack *sw);

/*

 * Prepare to unwind the currently running thread.

 */

extern void unw_init_running (void (*callback)(struct unw_frame_info *info, void *arg), void *arg);

/*

 * Unwind to previous to frame.  Returns 0 if successful, negative

 * number in case of an error.

 */

extern int unw_unwind (struct unw_frame_info *info);

/*

 * Unwind until the return pointer is in user-land (or until an error

 * occurs).  Returns 0 if successful, negative number in case of

 * error.

 */

extern int unw_unwind_to_user (struct unw_frame_info *info);

#define unw_is_intr_frame(info) (((info)->flags & UNW_FLAG_INTERRUPT_FRAME) != 0)

static inline int

unw_get_ip (struct unw_frame_info *info, unsigned long *valp)

{

        *valp = (info)->ip;

        return 0;

}

static inline int

unw_get_sp (struct unw_frame_info *info, unsigned long *valp)

{

        *valp = (info)->sp;

        return 0;

}

static inline int

unw_get_psp (struct unw_frame_info *info, unsigned long *valp)

{

        *valp = (info)->psp;

        return 0;

}

static inline int

unw_get_bsp (struct unw_frame_info *info, unsigned long *valp)

{

        *valp = (info)->bsp;

        return 0;

}

static inline int

unw_get_cfm (struct unw_frame_info *info, unsigned long *valp)

{

        *valp = *(info)->cfm_loc;

        return 0;

}

static inline int

unw_set_cfm (struct unw_frame_info *info, unsigned long val)

{

        *(info)->cfm_loc = val;

        return 0;

}

static inline int

unw_get_rp (struct unw_frame_info *info, unsigned long *val)

{

        if (!info->rp_loc)

                return -1;

        *val = *info->rp_loc;

        return 0;

}

extern int unw_access_gr (struct unw_frame_info *, int, unsigned long *, char *, int);

extern int unw_access_br (struct unw_frame_info *, int, unsigned long *, int);

extern int unw_access_fr (struct unw_frame_info *, int, struct ia64_fpreg *, int);

extern int unw_access_ar (struct unw_frame_info *, int, unsigned long *, int);

extern int unw_access_pr (struct unw_frame_info *, unsigned long *, int);

static inline int

unw_set_gr (struct unw_frame_info *i, int n, unsigned long v, char nat)

{

        return unw_access_gr(i, n, &v, &nat, 1);

}

static inline int

unw_set_br (struct unw_frame_info *i, int n, unsigned long v)

{

        return unw_access_br(i, n, &v, 1);

}

static inline int

unw_set_fr (struct unw_frame_info *i, int n, struct ia64_fpreg v)

{

        return unw_access_fr(i, n, &v, 1);

}

static inline int

unw_set_ar (struct unw_frame_info *i, int n, unsigned long v)

{

        return unw_access_ar(i, n, &v, 1);

}

static inline int

unw_set_pr (struct unw_frame_info *i, unsigned long v)

{

        return unw_access_pr(i, &v, 1);

}

#define unw_get_gr(i,n,v,nat)   unw_access_gr(i,n,v,nat,0)

#define unw_get_br(i,n,v)       unw_access_br(i,n,v,0)

#define unw_get_fr(i,n,v)       unw_access_fr(i,n,v,0)

#define unw_get_ar(i,n,v)       unw_access_ar(i,n,v,0)

#define unw_get_pr(i,v)         unw_access_pr(i,v,0)

#endif /* _ASM_UNWIND_H */