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/* SPDX-License-Identifier: GPL-2.0 */
#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 {
unsigned 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_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);
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 */
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