1 #ifndef _ASM_IA64_UNWIND_H
2 #define _ASM_IA64_UNWIND_H
3
4 /*
5 * Copyright (C) 1999-2000 Hewlett-Packard Co
6 * Copyright (C) 1999-2000 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 };
31
32 /*
33 * The following declarations are private to the unwind
34 * implementation:
35 */
36
37 struct unw_stack {
38 unsigned long limit;
39 unsigned long top;
40 };
41
42 #define UNW_FLAG_INTERRUPT_FRAME (1UL << 0)
43
44 /*
45 * No user of this module should every access this structure directly
46 * as it is subject to change. It is declared here solely so we can
47 * use automatic variables.
48 */
49 struct unw_frame_info {
50 struct unw_stack regstk;
51 struct unw_stack memstk;
52 unsigned int flags;
53 short hint;
54 short prev_script;
55
56 /* current frame info: */
57 unsigned long bsp; /* backing store pointer value */
58 unsigned long sp; /* stack pointer value */
59 unsigned long psp; /* previous sp value */
60 unsigned long ip; /* instruction pointer value */
61 unsigned long pr; /* current predicate values */
62 unsigned long *cfm_loc; /* cfm save location (or NULL) */
63
64 struct task_struct *task;
65 struct switch_stack *sw;
66
67 /* preserved state: */
68 unsigned long *bsp_loc; /* previous bsp save location */
69 unsigned long *bspstore_loc;
70 unsigned long *pfs_loc;
71 unsigned long *rnat_loc;
72 unsigned long *rp_loc;
73 unsigned long *pri_unat_loc;
74 unsigned long *unat_loc;
75 unsigned long *pr_loc;
76 unsigned long *lc_loc;
77 unsigned long *fpsr_loc;
78 struct unw_ireg {
79 unsigned long *loc;
80 struct unw_ireg_nat {
81 long type : 3; /* enum unw_nat_type */
82 signed long off : 61; /* NaT word is at loc+nat.off */
83 } nat;
84 } r4, r5, r6, r7;
85 unsigned long *b1_loc, *b2_loc, *b3_loc, *b4_loc, *b5_loc;
86 struct ia64_fpreg *f2_loc, *f3_loc, *f4_loc, *f5_loc, *fr_loc[16];
87 };
88
89 /*
90 * The official API follows below:
91 */
92
93 /*
94 * Initialize unwind support.
95 */
96 extern void unw_init (void);
97
98 extern void *unw_add_unwind_table (const char *name, unsigned long segment_base, unsigned long gp,
99 void *table_start, void *table_end);
100
101 extern void unw_remove_unwind_table (void *handle);
102
103 /*
104 * Prepare to unwind blocked task t.
105 */
106 extern void unw_init_from_blocked_task (struct unw_frame_info *info, struct task_struct *t);
107
108 extern void unw_init_frame_info (struct unw_frame_info *info, struct task_struct *t,
109 struct switch_stack *sw);
110
111 /*
112 * Prepare to unwind the current task. For this to work, the kernel
113 * stack identified by REGS must look like this:
114 *
115 * // //
116 * | |
117 * | kernel stack |
118 * | |
119 * +=====================+
120 * | struct pt_regs |
121 * +---------------------+ <--- REGS
122 * | struct switch_stack |
123 * +---------------------+
124 */
125 extern void unw_init_from_current (struct unw_frame_info *info, struct pt_regs *regs);
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 unsigned long
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 unsigned long
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 unsigned long
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 unsigned long
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 unsigned long
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 unsigned long
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 */
241
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