linux/arch/ia64/include/asm/unwind.h
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   1#ifndef _ASM_IA64_UNWIND_H
   2#define _ASM_IA64_UNWIND_H
   3
   4/*
   5 * Copyright (C) 1999-2000, 2003 Hewlett-Packard Co
   6 *      David Mosberger-Tang <davidm@hpl.hp.com>
   7 *
   8 * A simple API for unwinding kernel stacks.  This is used for
   9 * debugging and error reporting purposes.  The kernel doesn't need
  10 * full-blown stack unwinding with all the bells and whitles, so there
  11 * is not much point in implementing the full IA-64 unwind API (though
  12 * it would of course be possible to implement the kernel API on top
  13 * of it).
  14 */
  15
  16struct task_struct;     /* forward declaration */
  17struct switch_stack;    /* forward declaration */
  18
  19enum unw_application_register {
  20        UNW_AR_BSP,
  21        UNW_AR_BSPSTORE,
  22        UNW_AR_PFS,
  23        UNW_AR_RNAT,
  24        UNW_AR_UNAT,
  25        UNW_AR_LC,
  26        UNW_AR_EC,
  27        UNW_AR_FPSR,
  28        UNW_AR_RSC,
  29        UNW_AR_CCV,
  30        UNW_AR_CSD,
  31        UNW_AR_SSD
  32};
  33
  34/*
  35 * The following declarations are private to the unwind
  36 * implementation:
  37 */
  38
  39struct unw_stack {
  40        unsigned long limit;
  41        unsigned long top;
  42};
  43
  44#define UNW_FLAG_INTERRUPT_FRAME        (1UL << 0)
  45
  46/*
  47 * No user of this module should every access this structure directly
  48 * as it is subject to change.  It is declared here solely so we can
  49 * use automatic variables.
  50 */
  51struct unw_frame_info {
  52        struct unw_stack regstk;
  53        struct unw_stack memstk;
  54        unsigned int flags;
  55        short hint;
  56        short prev_script;
  57
  58        /* current frame info: */
  59        unsigned long bsp;              /* backing store pointer value */
  60        unsigned long sp;               /* stack pointer value */
  61        unsigned long psp;              /* previous sp value */
  62        unsigned long ip;               /* instruction pointer value */
  63        unsigned long pr;               /* current predicate values */
  64        unsigned long *cfm_loc;         /* cfm save location (or NULL) */
  65        unsigned long pt;               /* struct pt_regs location */
  66
  67        struct task_struct *task;
  68        struct switch_stack *sw;
  69
  70        /* preserved state: */
  71        unsigned long *bsp_loc;         /* previous bsp save location */
  72        unsigned long *bspstore_loc;
  73        unsigned long *pfs_loc;
  74        unsigned long *rnat_loc;
  75        unsigned long *rp_loc;
  76        unsigned long *pri_unat_loc;
  77        unsigned long *unat_loc;
  78        unsigned long *pr_loc;
  79        unsigned long *lc_loc;
  80        unsigned long *fpsr_loc;
  81        struct unw_ireg {
  82                unsigned long *loc;
  83                struct unw_ireg_nat {
  84                        unsigned long type : 3;         /* enum unw_nat_type */
  85                        signed long off : 61;           /* NaT word is at loc+nat.off */
  86                } nat;
  87        } r4, r5, r6, r7;
  88        unsigned long *b1_loc, *b2_loc, *b3_loc, *b4_loc, *b5_loc;
  89        struct ia64_fpreg *f2_loc, *f3_loc, *f4_loc, *f5_loc, *fr_loc[16];
  90};
  91
  92/*
  93 * The official API follows below:
  94 */
  95
  96struct unw_table_entry {
  97        u64 start_offset;
  98        u64 end_offset;
  99        u64 info_offset;
 100};
 101
 102/*
 103 * Initialize unwind support.
 104 */
 105extern void unw_init (void);
 106
 107extern void *unw_add_unwind_table (const char *name, unsigned long segment_base, unsigned long gp,
 108                                   const void *table_start, const void *table_end);
 109
 110extern void unw_remove_unwind_table (void *handle);
 111
 112/*
 113 * Prepare to unwind blocked task t.
 114 */
 115extern void unw_init_from_blocked_task (struct unw_frame_info *info, struct task_struct *t);
 116
 117extern void unw_init_frame_info (struct unw_frame_info *info, struct task_struct *t,
 118                                 struct switch_stack *sw);
 119
 120/*
 121 * Prepare to unwind the currently running thread.
 122 */
 123extern void unw_init_running (void (*callback)(struct unw_frame_info *info, void *arg), void *arg);
 124
 125/*
 126 * Unwind to previous to frame.  Returns 0 if successful, negative
 127 * number in case of an error.
 128 */
 129extern int unw_unwind (struct unw_frame_info *info);
 130
 131/*
 132 * Unwind until the return pointer is in user-land (or until an error
 133 * occurs).  Returns 0 if successful, negative number in case of
 134 * error.
 135 */
 136extern int unw_unwind_to_user (struct unw_frame_info *info);
 137
 138#define unw_is_intr_frame(info) (((info)->flags & UNW_FLAG_INTERRUPT_FRAME) != 0)
 139
 140static inline int
 141unw_get_ip (struct unw_frame_info *info, unsigned long *valp)
 142{
 143        *valp = (info)->ip;
 144        return 0;
 145}
 146
 147static inline int
 148unw_get_sp (struct unw_frame_info *info, unsigned long *valp)
 149{
 150        *valp = (info)->sp;
 151        return 0;
 152}
 153
 154static inline int
 155unw_get_psp (struct unw_frame_info *info, unsigned long *valp)
 156{
 157        *valp = (info)->psp;
 158        return 0;
 159}
 160
 161static inline int
 162unw_get_bsp (struct unw_frame_info *info, unsigned long *valp)
 163{
 164        *valp = (info)->bsp;
 165        return 0;
 166}
 167
 168static inline int
 169unw_get_cfm (struct unw_frame_info *info, unsigned long *valp)
 170{
 171        *valp = *(info)->cfm_loc;
 172        return 0;
 173}
 174
 175static inline int
 176unw_set_cfm (struct unw_frame_info *info, unsigned long val)
 177{
 178        *(info)->cfm_loc = val;
 179        return 0;
 180}
 181
 182static inline int
 183unw_get_rp (struct unw_frame_info *info, unsigned long *val)
 184{
 185        if (!info->rp_loc)
 186                return -1;
 187        *val = *info->rp_loc;
 188        return 0;
 189}
 190
 191extern int unw_access_gr (struct unw_frame_info *, int, unsigned long *, char *, int);
 192extern int unw_access_br (struct unw_frame_info *, int, unsigned long *, int);
 193extern int unw_access_fr (struct unw_frame_info *, int, struct ia64_fpreg *, int);
 194extern int unw_access_ar (struct unw_frame_info *, int, unsigned long *, int);
 195extern int unw_access_pr (struct unw_frame_info *, unsigned long *, int);
 196
 197static inline int
 198unw_set_gr (struct unw_frame_info *i, int n, unsigned long v, char nat)
 199{
 200        return unw_access_gr(i, n, &v, &nat, 1);
 201}
 202
 203static inline int
 204unw_set_br (struct unw_frame_info *i, int n, unsigned long v)
 205{
 206        return unw_access_br(i, n, &v, 1);
 207}
 208
 209static inline int
 210unw_set_fr (struct unw_frame_info *i, int n, struct ia64_fpreg v)
 211{
 212        return unw_access_fr(i, n, &v, 1);
 213}
 214
 215static inline int
 216unw_set_ar (struct unw_frame_info *i, int n, unsigned long v)
 217{
 218        return unw_access_ar(i, n, &v, 1);
 219}
 220
 221static inline int
 222unw_set_pr (struct unw_frame_info *i, unsigned long v)
 223{
 224        return unw_access_pr(i, &v, 1);
 225}
 226
 227#define unw_get_gr(i,n,v,nat)   unw_access_gr(i,n,v,nat,0)
 228#define unw_get_br(i,n,v)       unw_access_br(i,n,v,0)
 229#define unw_get_fr(i,n,v)       unw_access_fr(i,n,v,0)
 230#define unw_get_ar(i,n,v)       unw_access_ar(i,n,v,0)
 231#define unw_get_pr(i,v)         unw_access_pr(i,v,0)
 232
 233#endif /* _ASM_UNWIND_H */
 234
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