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TOMOYO Linux Cross Reference
Linux/arch/ia64/include/asm/unwind.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _ASM_IA64_UNWIND_H
  3 #define _ASM_IA64_UNWIND_H
  4 
  5 /*
  6  * Copyright (C) 1999-2000, 2003 Hewlett-Packard Co
  7  *      David Mosberger-Tang <davidm@hpl.hp.com>
  8  *
  9  * A simple API for unwinding kernel stacks.  This is used for
 10  * debugging and error reporting purposes.  The kernel doesn't need
 11  * full-blown stack unwinding with all the bells and whitles, so there
 12  * is not much point in implementing the full IA-64 unwind API (though
 13  * it would of course be possible to implement the kernel API on top
 14  * of it).
 15  */
 16 
 17 struct task_struct;     /* forward declaration */
 18 struct switch_stack;    /* forward declaration */
 19 
 20 enum unw_application_register {
 21         UNW_AR_BSP,
 22         UNW_AR_BSPSTORE,
 23         UNW_AR_PFS,
 24         UNW_AR_RNAT,
 25         UNW_AR_UNAT,
 26         UNW_AR_LC,
 27         UNW_AR_EC,
 28         UNW_AR_FPSR,
 29         UNW_AR_RSC,
 30         UNW_AR_CCV,
 31         UNW_AR_CSD,
 32         UNW_AR_SSD
 33 };
 34 
 35 /*
 36  * The following declarations are private to the unwind
 37  * implementation:
 38  */
 39 
 40 struct unw_stack {
 41         unsigned long limit;
 42         unsigned long top;
 43 };
 44 
 45 #define UNW_FLAG_INTERRUPT_FRAME        (1UL << 0)
 46 
 47 /*
 48  * No user of this module should every access this structure directly
 49  * as it is subject to change.  It is declared here solely so we can
 50  * use automatic variables.
 51  */
 52 struct unw_frame_info {
 53         struct unw_stack regstk;
 54         struct unw_stack memstk;
 55         unsigned int flags;
 56         short hint;
 57         short prev_script;
 58 
 59         /* current frame info: */
 60         unsigned long bsp;              /* backing store pointer value */
 61         unsigned long sp;               /* stack pointer value */
 62         unsigned long psp;              /* previous sp value */
 63         unsigned long ip;               /* instruction pointer value */
 64         unsigned long pr;               /* current predicate values */
 65         unsigned long *cfm_loc;         /* cfm save location (or NULL) */
 66         unsigned long pt;               /* struct pt_regs location */
 67 
 68         struct task_struct *task;
 69         struct switch_stack *sw;
 70 
 71         /* preserved state: */
 72         unsigned long *bsp_loc;         /* previous bsp save location */
 73         unsigned long *bspstore_loc;
 74         unsigned long *pfs_loc;
 75         unsigned long *rnat_loc;
 76         unsigned long *rp_loc;
 77         unsigned long *pri_unat_loc;
 78         unsigned long *unat_loc;
 79         unsigned long *pr_loc;
 80         unsigned long *lc_loc;
 81         unsigned long *fpsr_loc;
 82         struct unw_ireg {
 83                 unsigned long *loc;
 84                 struct unw_ireg_nat {
 85                         unsigned long type : 3;         /* enum unw_nat_type */
 86                         signed long off : 61;           /* NaT word is at loc+nat.off */
 87                 } nat;
 88         } r4, r5, r6, r7;
 89         unsigned long *b1_loc, *b2_loc, *b3_loc, *b4_loc, *b5_loc;
 90         struct ia64_fpreg *f2_loc, *f3_loc, *f4_loc, *f5_loc, *fr_loc[16];
 91 };
 92 
 93 /*
 94  * The official API follows below:
 95  */
 96 
 97 struct unw_table_entry {
 98         u64 start_offset;
 99         u64 end_offset;
100         u64 info_offset;
101 };
102 
103 /*
104  * Initialize unwind support.
105  */
106 extern void unw_init (void);
107 
108 extern void *unw_add_unwind_table (const char *name, unsigned long segment_base, unsigned long gp,
109                                    const void *table_start, const void *table_end);
110 
111 extern void unw_remove_unwind_table (void *handle);
112 
113 /*
114  * Prepare to unwind blocked task t.
115  */
116 extern void unw_init_from_blocked_task (struct unw_frame_info *info, struct task_struct *t);
117 
118 extern void unw_init_frame_info (struct unw_frame_info *info, struct task_struct *t,
119                                  struct switch_stack *sw);
120 
121 /*
122  * Prepare to unwind the currently running thread.
123  */
124 extern void unw_init_running (void (*callback)(struct unw_frame_info *info, void *arg), void *arg);
125 
126 /*
127  * Unwind to previous to frame.  Returns 0 if successful, negative
128  * number in case of an error.
129  */
130 extern int unw_unwind (struct unw_frame_info *info);
131 
132 /*
133  * Unwind until the return pointer is in user-land (or until an error
134  * occurs).  Returns 0 if successful, negative number in case of
135  * error.
136  */
137 extern int unw_unwind_to_user (struct unw_frame_info *info);
138 
139 #define unw_is_intr_frame(info) (((info)->flags & UNW_FLAG_INTERRUPT_FRAME) != 0)
140 
141 static inline int
142 unw_get_ip (struct unw_frame_info *info, unsigned long *valp)
143 {
144         *valp = (info)->ip;
145         return 0;
146 }
147 
148 static inline int
149 unw_get_sp (struct unw_frame_info *info, unsigned long *valp)
150 {
151         *valp = (info)->sp;
152         return 0;
153 }
154 
155 static inline int
156 unw_get_psp (struct unw_frame_info *info, unsigned long *valp)
157 {
158         *valp = (info)->psp;
159         return 0;
160 }
161 
162 static inline int
163 unw_get_bsp (struct unw_frame_info *info, unsigned long *valp)
164 {
165         *valp = (info)->bsp;
166         return 0;
167 }
168 
169 static inline int
170 unw_get_cfm (struct unw_frame_info *info, unsigned long *valp)
171 {
172         *valp = *(info)->cfm_loc;
173         return 0;
174 }
175 
176 static inline int
177 unw_set_cfm (struct unw_frame_info *info, unsigned long val)
178 {
179         *(info)->cfm_loc = val;
180         return 0;
181 }
182 
183 static inline int
184 unw_get_rp (struct unw_frame_info *info, unsigned long *val)
185 {
186         if (!info->rp_loc)
187                 return -1;
188         *val = *info->rp_loc;
189         return 0;
190 }
191 
192 extern int unw_access_gr (struct unw_frame_info *, int, unsigned long *, char *, int);
193 extern int unw_access_br (struct unw_frame_info *, int, unsigned long *, int);
194 extern int unw_access_fr (struct unw_frame_info *, int, struct ia64_fpreg *, int);
195 extern int unw_access_ar (struct unw_frame_info *, int, unsigned long *, int);
196 extern int unw_access_pr (struct unw_frame_info *, unsigned long *, int);
197 
198 static inline int
199 unw_set_gr (struct unw_frame_info *i, int n, unsigned long v, char nat)
200 {
201         return unw_access_gr(i, n, &v, &nat, 1);
202 }
203 
204 static inline int
205 unw_set_br (struct unw_frame_info *i, int n, unsigned long v)
206 {
207         return unw_access_br(i, n, &v, 1);
208 }
209 
210 static inline int
211 unw_set_fr (struct unw_frame_info *i, int n, struct ia64_fpreg v)
212 {
213         return unw_access_fr(i, n, &v, 1);
214 }
215 
216 static inline int
217 unw_set_ar (struct unw_frame_info *i, int n, unsigned long v)
218 {
219         return unw_access_ar(i, n, &v, 1);
220 }
221 
222 static inline int
223 unw_set_pr (struct unw_frame_info *i, unsigned long v)
224 {
225         return unw_access_pr(i, &v, 1);
226 }
227 
228 #define unw_get_gr(i,n,v,nat)   unw_access_gr(i,n,v,nat,0)
229 #define unw_get_br(i,n,v)       unw_access_br(i,n,v,0)
230 #define unw_get_fr(i,n,v)       unw_access_fr(i,n,v,0)
231 #define unw_get_ar(i,n,v)       unw_access_ar(i,n,v,0)
232 #define unw_get_pr(i,v)         unw_access_pr(i,v,0)
233 
234 #endif /* _ASM_UNWIND_H */
235 

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