include/asm-ia64/unwind.h

   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
  16 struct task_struct;     /* forward declaration */
  17 struct switch_stack;    /* forward declaration */
  18
  19 enum 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
  39 struct 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  */
  51 struct 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                         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
  96 struct unw_table_entry {
  97         u64 start_offset;
  98         u64 end_offset;
  99         u64 info_offset;
 100 };
 101
 102 /*
 103  * Initialize unwind support.
 104  */
 105 extern void unw_init (void);
 106
 107 extern 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
 110 extern void unw_remove_unwind_table (void *handle);
 111
 112 /*
 113  * Prepare to unwind blocked task t.
 114  */
 115 extern void unw_init_from_blocked_task (struct unw_frame_info *info, struct task_struct *t);
 116
 117 /*
 118  * Prepare to unwind from interruption.  The pt-regs and switch-stack structures must have
 119  * be "adjacent" (no state modifications between pt-regs and switch-stack).
 120  */
 121 extern void unw_init_from_interruption (struct unw_frame_info *info, struct task_struct *t,
 122                                         struct pt_regs *pt, struct switch_stack *sw);
 123
 124 extern void unw_init_frame_info (struct unw_frame_info *info, struct task_struct *t,
 125                                  struct switch_stack *sw);
 126
 127 /*
 128  * Prepare to unwind the currently running thread.
 129  */
 130 extern void unw_init_running (void (*callback)(struct unw_frame_info *info, void *arg), void *arg);
 131
 132 /*
 133  * Unwind to previous to frame.  Returns 0 if successful, negative
 134  * number in case of an error.
 135  */
 136 extern int unw_unwind (struct unw_frame_info *info);
 137
 138 /*
 139  * Unwind until the return pointer is in user-land (or until an error
 140  * occurs).  Returns 0 if successful, negative number in case of
 141  * error.
 142  */
 143 extern int unw_unwind_to_user (struct unw_frame_info *info);
 144
 145 #define unw_is_intr_frame(info) (((info)->flags & UNW_FLAG_INTERRUPT_FRAME) != 0)
 146
 147 static inline int
 148 unw_get_ip (struct unw_frame_info *info, unsigned long *valp)
 149 {
 150         *valp = (info)->ip;
 151         return 0;
 152 }
 153
 154 static inline int
 155 unw_get_sp (struct unw_frame_info *info, unsigned long *valp)
 156 {
 157         *valp = (info)->sp;
 158         return 0;
 159 }
 160
 161 static inline int
 162 unw_get_psp (struct unw_frame_info *info, unsigned long *valp)
 163 {
 164         *valp = (info)->psp;
 165         return 0;
 166 }
 167
 168 static inline int
 169 unw_get_bsp (struct unw_frame_info *info, unsigned long *valp)
 170 {
 171         *valp = (info)->bsp;
 172         return 0;
 173 }
 174
 175 static inline int
 176 unw_get_cfm (struct unw_frame_info *info, unsigned long *valp)
 177 {
 178         *valp = *(info)->cfm_loc;
 179         return 0;
 180 }
 181
 182 static inline int
 183 unw_set_cfm (struct unw_frame_info *info, unsigned long val)
 184 {
 185         *(info)->cfm_loc = val;
 186         return 0;
 187 }
 188
 189 static inline int
 190 unw_get_rp (struct unw_frame_info *info, unsigned long *val)
 191 {
 192         if (!info->rp_loc)
 193                 return -1;
 194         *val = *info->rp_loc;
 195         return 0;
 196 }
 197
 198 extern int unw_access_gr (struct unw_frame_info *, int, unsigned long *, char *, int);
 199 extern int unw_access_br (struct unw_frame_info *, int, unsigned long *, int);
 200 extern int unw_access_fr (struct unw_frame_info *, int, struct ia64_fpreg *, int);
 201 extern int unw_access_ar (struct unw_frame_info *, int, unsigned long *, int);
 202 extern int unw_access_pr (struct unw_frame_info *, unsigned long *, int);
 203
 204 static inline int
 205 unw_set_gr (struct unw_frame_info *i, int n, unsigned long v, char nat)
 206 {
 207         return unw_access_gr(i, n, &v, &nat, 1);
 208 }
 209
 210 static inline int
 211 unw_set_br (struct unw_frame_info *i, int n, unsigned long v)
 212 {
 213         return unw_access_br(i, n, &v, 1);
 214 }
 215
 216 static inline int
 217 unw_set_fr (struct unw_frame_info *i, int n, struct ia64_fpreg v)
 218 {
 219         return unw_access_fr(i, n, &v, 1);
 220 }
 221
 222 static inline int
 223 unw_set_ar (struct unw_frame_info *i, int n, unsigned long v)
 224 {
 225         return unw_access_ar(i, n, &v, 1);
 226 }
 227
 228 static inline int
 229 unw_set_pr (struct unw_frame_info *i, unsigned long v)
 230 {
 231         return unw_access_pr(i, &v, 1);
 232 }
 233
 234 #define unw_get_gr(i,n,v,nat)   unw_access_gr(i,n,v,nat,0)
 235 #define unw_get_br(i,n,v)       unw_access_br(i,n,v,0)
 236 #define unw_get_fr(i,n,v)       unw_access_fr(i,n,v,0)
 237 #define unw_get_ar(i,n,v)       unw_access_ar(i,n,v,0)
 238 #define unw_get_pr(i,v)         unw_access_pr(i,v,0)
 239
 240 #endif /* _ASM_UNWIND_H */