Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
1da177e4 LT |
117 | extern 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 | */ | |
123 | extern 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 | */ | |
129 | extern 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 | */ | |
136 | extern 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 | ||
140 | static inline int | |
141 | unw_get_ip (struct unw_frame_info *info, unsigned long *valp) | |
142 | { | |
143 | *valp = (info)->ip; | |
144 | return 0; | |
145 | } | |
146 | ||
147 | static inline int | |
148 | unw_get_sp (struct unw_frame_info *info, unsigned long *valp) | |
149 | { | |
150 | *valp = (info)->sp; | |
151 | return 0; | |
152 | } | |
153 | ||
154 | static inline int | |
155 | unw_get_psp (struct unw_frame_info *info, unsigned long *valp) | |
156 | { | |
157 | *valp = (info)->psp; | |
158 | return 0; | |
159 | } | |
160 | ||
161 | static inline int | |
162 | unw_get_bsp (struct unw_frame_info *info, unsigned long *valp) | |
163 | { | |
164 | *valp = (info)->bsp; | |
165 | return 0; | |
166 | } | |
167 | ||
168 | static inline int | |
169 | unw_get_cfm (struct unw_frame_info *info, unsigned long *valp) | |
170 | { | |
171 | *valp = *(info)->cfm_loc; | |
172 | return 0; | |
173 | } | |
174 | ||
175 | static inline int | |
176 | unw_set_cfm (struct unw_frame_info *info, unsigned long val) | |
177 | { | |
178 | *(info)->cfm_loc = val; | |
179 | return 0; | |
180 | } | |
181 | ||
182 | static inline int | |
183 | unw_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 | ||
191 | extern int unw_access_gr (struct unw_frame_info *, int, unsigned long *, char *, int); | |
192 | extern int unw_access_br (struct unw_frame_info *, int, unsigned long *, int); | |
193 | extern int unw_access_fr (struct unw_frame_info *, int, struct ia64_fpreg *, int); | |
194 | extern int unw_access_ar (struct unw_frame_info *, int, unsigned long *, int); | |
195 | extern int unw_access_pr (struct unw_frame_info *, unsigned long *, int); | |
196 | ||
197 | static inline int | |
198 | unw_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 | ||
203 | static inline int | |
204 | unw_set_br (struct unw_frame_info *i, int n, unsigned long v) | |
205 | { | |
206 | return unw_access_br(i, n, &v, 1); | |
207 | } | |
208 | ||
209 | static inline int | |
210 | unw_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 | ||
215 | static inline int | |
216 | unw_set_ar (struct unw_frame_info *i, int n, unsigned long v) | |
217 | { | |
218 | return unw_access_ar(i, n, &v, 1); | |
219 | } | |
220 | ||
221 | static inline int | |
222 | unw_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 */ |