#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_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 */