234 lines
5.7 KiB
C
234 lines
5.7 KiB
C
#ifndef _ASM_IA64_UNWIND_H
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#define _ASM_IA64_UNWIND_H
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/*
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* Copyright (C) 1999-2000, 2003 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*
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* A simple API for unwinding kernel stacks. This is used for
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* debugging and error reporting purposes. The kernel doesn't need
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* full-blown stack unwinding with all the bells and whitles, so there
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* is not much point in implementing the full IA-64 unwind API (though
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* it would of course be possible to implement the kernel API on top
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* of it).
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*/
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struct task_struct; /* forward declaration */
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struct switch_stack; /* forward declaration */
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enum unw_application_register {
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UNW_AR_BSP,
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UNW_AR_BSPSTORE,
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UNW_AR_PFS,
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UNW_AR_RNAT,
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UNW_AR_UNAT,
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UNW_AR_LC,
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UNW_AR_EC,
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UNW_AR_FPSR,
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UNW_AR_RSC,
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UNW_AR_CCV,
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UNW_AR_CSD,
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UNW_AR_SSD
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};
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/*
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* The following declarations are private to the unwind
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* implementation:
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*/
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struct unw_stack {
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unsigned long limit;
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unsigned long top;
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};
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#define UNW_FLAG_INTERRUPT_FRAME (1UL << 0)
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/*
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* No user of this module should every access this structure directly
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* as it is subject to change. It is declared here solely so we can
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* use automatic variables.
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*/
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struct unw_frame_info {
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struct unw_stack regstk;
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struct unw_stack memstk;
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unsigned int flags;
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short hint;
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short prev_script;
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/* current frame info: */
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unsigned long bsp; /* backing store pointer value */
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unsigned long sp; /* stack pointer value */
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unsigned long psp; /* previous sp value */
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unsigned long ip; /* instruction pointer value */
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unsigned long pr; /* current predicate values */
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unsigned long *cfm_loc; /* cfm save location (or NULL) */
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unsigned long pt; /* struct pt_regs location */
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struct task_struct *task;
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struct switch_stack *sw;
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/* preserved state: */
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unsigned long *bsp_loc; /* previous bsp save location */
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unsigned long *bspstore_loc;
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unsigned long *pfs_loc;
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unsigned long *rnat_loc;
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unsigned long *rp_loc;
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unsigned long *pri_unat_loc;
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unsigned long *unat_loc;
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unsigned long *pr_loc;
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unsigned long *lc_loc;
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unsigned long *fpsr_loc;
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struct unw_ireg {
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unsigned long *loc;
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struct unw_ireg_nat {
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unsigned long type : 3; /* enum unw_nat_type */
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signed long off : 61; /* NaT word is at loc+nat.off */
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} nat;
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} r4, r5, r6, r7;
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unsigned long *b1_loc, *b2_loc, *b3_loc, *b4_loc, *b5_loc;
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struct ia64_fpreg *f2_loc, *f3_loc, *f4_loc, *f5_loc, *fr_loc[16];
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};
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/*
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* The official API follows below:
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*/
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struct unw_table_entry {
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u64 start_offset;
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u64 end_offset;
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u64 info_offset;
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};
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/*
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* Initialize unwind support.
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*/
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extern void unw_init (void);
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extern void *unw_add_unwind_table (const char *name, unsigned long segment_base, unsigned long gp,
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const void *table_start, const void *table_end);
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extern void unw_remove_unwind_table (void *handle);
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/*
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* Prepare to unwind blocked task t.
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*/
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extern void unw_init_from_blocked_task (struct unw_frame_info *info, struct task_struct *t);
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extern void unw_init_frame_info (struct unw_frame_info *info, struct task_struct *t,
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struct switch_stack *sw);
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/*
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* Prepare to unwind the currently running thread.
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*/
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extern void unw_init_running (void (*callback)(struct unw_frame_info *info, void *arg), void *arg);
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/*
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* Unwind to previous to frame. Returns 0 if successful, negative
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* number in case of an error.
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*/
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extern int unw_unwind (struct unw_frame_info *info);
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/*
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* Unwind until the return pointer is in user-land (or until an error
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* occurs). Returns 0 if successful, negative number in case of
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* error.
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*/
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extern int unw_unwind_to_user (struct unw_frame_info *info);
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#define unw_is_intr_frame(info) (((info)->flags & UNW_FLAG_INTERRUPT_FRAME) != 0)
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static inline int
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unw_get_ip (struct unw_frame_info *info, unsigned long *valp)
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{
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*valp = (info)->ip;
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return 0;
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}
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static inline int
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unw_get_sp (struct unw_frame_info *info, unsigned long *valp)
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{
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*valp = (info)->sp;
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return 0;
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}
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static inline int
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unw_get_psp (struct unw_frame_info *info, unsigned long *valp)
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{
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*valp = (info)->psp;
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return 0;
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}
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static inline int
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unw_get_bsp (struct unw_frame_info *info, unsigned long *valp)
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{
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*valp = (info)->bsp;
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return 0;
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}
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static inline int
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unw_get_cfm (struct unw_frame_info *info, unsigned long *valp)
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{
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*valp = *(info)->cfm_loc;
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return 0;
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}
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static inline int
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unw_set_cfm (struct unw_frame_info *info, unsigned long val)
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{
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*(info)->cfm_loc = val;
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return 0;
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}
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static inline int
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unw_get_rp (struct unw_frame_info *info, unsigned long *val)
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{
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if (!info->rp_loc)
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return -1;
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*val = *info->rp_loc;
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return 0;
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}
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extern int unw_access_gr (struct unw_frame_info *, int, unsigned long *, char *, int);
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extern int unw_access_br (struct unw_frame_info *, int, unsigned long *, int);
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extern int unw_access_fr (struct unw_frame_info *, int, struct ia64_fpreg *, int);
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extern int unw_access_ar (struct unw_frame_info *, int, unsigned long *, int);
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extern int unw_access_pr (struct unw_frame_info *, unsigned long *, int);
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static inline int
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unw_set_gr (struct unw_frame_info *i, int n, unsigned long v, char nat)
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{
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return unw_access_gr(i, n, &v, &nat, 1);
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}
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static inline int
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unw_set_br (struct unw_frame_info *i, int n, unsigned long v)
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{
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return unw_access_br(i, n, &v, 1);
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}
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static inline int
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unw_set_fr (struct unw_frame_info *i, int n, struct ia64_fpreg v)
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{
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return unw_access_fr(i, n, &v, 1);
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}
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static inline int
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unw_set_ar (struct unw_frame_info *i, int n, unsigned long v)
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{
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return unw_access_ar(i, n, &v, 1);
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}
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static inline int
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unw_set_pr (struct unw_frame_info *i, unsigned long v)
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{
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return unw_access_pr(i, &v, 1);
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}
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#define unw_get_gr(i,n,v,nat) unw_access_gr(i,n,v,nat,0)
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#define unw_get_br(i,n,v) unw_access_br(i,n,v,0)
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#define unw_get_fr(i,n,v) unw_access_fr(i,n,v,0)
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#define unw_get_ar(i,n,v) unw_access_ar(i,n,v,0)
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#define unw_get_pr(i,v) unw_access_pr(i,v,0)
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#endif /* _ASM_UNWIND_H */
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