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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 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
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 */
121extern void unw_init_from_interruption (struct unw_frame_info *info, struct task_struct *t,
122 struct pt_regs *pt, struct switch_stack *sw);
123
124extern 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 */
130extern 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 */
136extern 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 */
143extern 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
147static inline int
148unw_get_ip (struct unw_frame_info *info, unsigned long *valp)
149{
150 *valp = (info)->ip;
151 return 0;
152}
153
154static inline int
155unw_get_sp (struct unw_frame_info *info, unsigned long *valp)
156{
157 *valp = (info)->sp;
158 return 0;
159}
160
161static inline int
162unw_get_psp (struct unw_frame_info *info, unsigned long *valp)
163{
164 *valp = (info)->psp;
165 return 0;
166}
167
168static inline int
169unw_get_bsp (struct unw_frame_info *info, unsigned long *valp)
170{
171 *valp = (info)->bsp;
172 return 0;
173}
174
175static inline int
176unw_get_cfm (struct unw_frame_info *info, unsigned long *valp)
177{
178 *valp = *(info)->cfm_loc;
179 return 0;
180}
181
182static inline int
183unw_set_cfm (struct unw_frame_info *info, unsigned long val)
184{
185 *(info)->cfm_loc = val;
186 return 0;
187}
188
189static inline int
190unw_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
198extern int unw_access_gr (struct unw_frame_info *, int, unsigned long *, char *, int);
199extern int unw_access_br (struct unw_frame_info *, int, unsigned long *, int);
200extern int unw_access_fr (struct unw_frame_info *, int, struct ia64_fpreg *, int);
201extern int unw_access_ar (struct unw_frame_info *, int, unsigned long *, int);
202extern int unw_access_pr (struct unw_frame_info *, unsigned long *, int);
203
204static inline int
205unw_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
210static inline int
211unw_set_br (struct unw_frame_info *i, int n, unsigned long v)
212{
213 return unw_access_br(i, n, &v, 1);
214}
215
216static inline int
217unw_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
222static inline int
223unw_set_ar (struct unw_frame_info *i, int n, unsigned long v)
224{
225 return unw_access_ar(i, n, &v, 1);
226}
227
228static inline int
229unw_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 */
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