1 /* libunwind - a platform-independent unwind library
2 Copyright (C) 2001-2005 Hewlett-Packard Co
3 Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
4 Copyright (C) 2013 Linaro Limited
5
6 This file is part of libunwind.
7
8 Permission is hereby granted, free of charge, to any person obtaining
9 a copy of this software and associated documentation files (the
10 "Software"), to deal in the Software without restriction, including
11 without limitation the rights to use, copy, modify, merge, publish,
12 distribute, sublicense, and/or sell copies of the Software, and to
13 permit persons to whom the Software is furnished to do so, subject to
14 the following conditions:
15
16 The above copyright notice and this permission notice shall be
17 included in all copies or substantial portions of the Software.
18
19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
22 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
23 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
24 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
25 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
26
27 #ifndef AARCH64_LIBUNWIND_I_H
28 #define AARCH64_LIBUNWIND_I_H
29
30 /* Target-dependent definitions that are internal to libunwind but need
31 to be shared with target-independent code. */
32
33 #include <stdlib.h>
34 #include <libunwind.h>
35
36 #include "elf64.h"
37 /* ANDROID support update. */
38 #include "map_info.h"
39 /* End of ANDROID update. */
40 #include "mempool.h"
41 #include "dwarf.h"
42
43 typedef struct
44 {
45 /* no aarch64-specific fast trace */
46 }
47 unw_tdep_frame_t;
48
49 #ifdef UNW_LOCAL_ONLY
50
51 typedef unw_word_t aarch64_loc_t;
52
53 #else /* !UNW_LOCAL_ONLY */
54
55 typedef struct aarch64_loc
56 {
57 unw_word_t w0, w1;
58 }
59 aarch64_loc_t;
60
61 #endif /* !UNW_LOCAL_ONLY */
62
63 struct unw_addr_space
64 {
65 struct unw_accessors acc;
66 int big_endian;
67 unw_caching_policy_t caching_policy;
68 #ifdef HAVE_ATOMIC_OPS_H
69 AO_t cache_generation;
70 #else
71 uint32_t cache_generation;
72 #endif
73 unw_word_t dyn_generation; /* see dyn-common.h */
74 unw_word_t dyn_info_list_addr; /* (cached) dyn_info_list_addr */
75 struct dwarf_rs_cache global_cache;
76 struct unw_debug_frame_list *debug_frames;
77 /* ANDROID support update. */
78 struct map_info *map_list;
79 /* End of ANDROID update. */
80 };
81
82 struct cursor
83 {
84 struct dwarf_cursor dwarf; /* must be first */
85 enum
86 {
87 AARCH64_SCF_NONE,
88 AARCH64_SCF_LINUX_RT_SIGFRAME,
89 }
90 sigcontext_format;
91 unw_word_t sigcontext_addr;
92 unw_word_t sigcontext_sp;
93 unw_word_t sigcontext_pc;
94 };
95
96 #define DWARF_GET_LOC(l) ((l).val)
97
98 #ifdef UNW_LOCAL_ONLY
99 # define DWARF_NULL_LOC DWARF_LOC (0, 0)
100 # define DWARF_IS_NULL_LOC(l) (DWARF_GET_LOC (l) == 0)
101 # define DWARF_LOC(r, t) ((dwarf_loc_t) { .val = (r) })
102 # define DWARF_IS_REG_LOC(l) 0
103 # define DWARF_REG_LOC(c,r) (DWARF_LOC((unw_word_t) \
104 tdep_uc_addr((c)->as_arg, (r)), 0))
105 # define DWARF_MEM_LOC(c,m) DWARF_LOC ((m), 0)
106 # define DWARF_FPREG_LOC(c,r) (DWARF_LOC((unw_word_t) \
107 tdep_uc_addr((c)->as_arg, (r)), 0))
108
109 static inline int
dwarf_getfp(struct dwarf_cursor * c,dwarf_loc_t loc,unw_fpreg_t * val)110 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val)
111 {
112 /* ANDROID support update. */
113 unw_fpreg_t *addr = (unw_fpreg_t *) (uintptr_t) DWARF_GET_LOC (loc);
114 if (!addr || !map_local_is_readable ((unw_word_t) (uintptr_t) addr, sizeof(unw_fpreg_t)))
115 return -1;
116
117 *val = *addr;
118 return 0;
119 /* End of ANDROID update. */
120 }
121
122 static inline int
dwarf_putfp(struct dwarf_cursor * c,dwarf_loc_t loc,unw_fpreg_t val)123 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
124 {
125 /* ANDROID support update. */
126 unw_fpreg_t *addr = (unw_fpreg_t *) (uintptr_t) DWARF_GET_LOC (loc);
127 if (!addr || !map_local_is_writable ((unw_word_t) (uintptr_t) addr, sizeof(unw_fpreg_t)))
128 return -1;
129
130 *addr = val;
131 return 0;
132 /* End of ANDROID update. */
133 }
134
135 static inline int
dwarf_get(struct dwarf_cursor * c,dwarf_loc_t loc,unw_word_t * val)136 dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val)
137 {
138 /* ANDROID support update. */
139 if (!DWARF_GET_LOC (loc))
140 return -1;
141 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val,
142 0, c->as_arg);
143 /* End of ANDROID update. */
144 }
145
146 static inline int
dwarf_put(struct dwarf_cursor * c,dwarf_loc_t loc,unw_word_t val)147 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
148 {
149 /* ANDROID support update. */
150 if (!DWARF_GET_LOC (loc))
151 return -1;
152 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val,
153 1, c->as_arg);
154 /* End of ANDROID update. */
155 }
156
157 #else /* !UNW_LOCAL_ONLY */
158 # define DWARF_LOC_TYPE_FP (1 << 0)
159 # define DWARF_LOC_TYPE_REG (1 << 1)
160 # define DWARF_NULL_LOC DWARF_LOC (0, 0)
161 # define DWARF_IS_NULL_LOC(l) \
162 ({ dwarf_loc_t _l = (l); _l.val == 0 && _l.type == 0; })
163 # define DWARF_LOC(r, t) ((dwarf_loc_t) { .val = (r), .type = (t) })
164 # define DWARF_IS_REG_LOC(l) (((l).type & DWARF_LOC_TYPE_REG) != 0)
165 # define DWARF_IS_FP_LOC(l) (((l).type & DWARF_LOC_TYPE_FP) != 0)
166 # define DWARF_REG_LOC(c,r) DWARF_LOC((r), DWARF_LOC_TYPE_REG)
167 # define DWARF_MEM_LOC(c,m) DWARF_LOC ((m), 0)
168 # define DWARF_FPREG_LOC(c,r) DWARF_LOC((r), (DWARF_LOC_TYPE_REG \
169 | DWARF_LOC_TYPE_FP))
170
171 static inline int
dwarf_getfp(struct dwarf_cursor * c,dwarf_loc_t loc,unw_fpreg_t * val)172 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val)
173 {
174 char *valp = (char *) &val;
175 unw_word_t addr;
176 int ret;
177
178 if (DWARF_IS_NULL_LOC (loc))
179 return -UNW_EBADREG;
180
181 if (DWARF_IS_REG_LOC (loc))
182 return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
183 val, 0, c->as_arg);
184
185 addr = DWARF_GET_LOC (loc);
186 if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp,
187 0, c->as_arg)) < 0)
188 return ret;
189
190 return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1, 0,
191 c->as_arg);
192 }
193
194 static inline int
dwarf_putfp(struct dwarf_cursor * c,dwarf_loc_t loc,unw_fpreg_t val)195 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
196 {
197 char *valp = (char *) &val;
198 unw_word_t addr;
199 int ret;
200
201 if (DWARF_IS_NULL_LOC (loc))
202 return -UNW_EBADREG;
203
204 if (DWARF_IS_REG_LOC (loc))
205 return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
206 &val, 1, c->as_arg);
207
208 addr = DWARF_GET_LOC (loc);
209 if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp,
210 1, c->as_arg)) < 0)
211 return ret;
212
213 return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1,
214 1, c->as_arg);
215 }
216
217 static inline int
dwarf_get(struct dwarf_cursor * c,dwarf_loc_t loc,unw_word_t * val)218 dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val)
219 {
220 if (DWARF_IS_NULL_LOC (loc))
221 return -UNW_EBADREG;
222
223 /* If a code-generator were to save a value of type unw_word_t in a
224 floating-point register, we would have to support this case. I
225 suppose it could happen with MMX registers, but does it really
226 happen? */
227 assert (!DWARF_IS_FP_LOC (loc));
228
229 if (DWARF_IS_REG_LOC (loc))
230 return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), val,
231 0, c->as_arg);
232 else
233 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val,
234 0, c->as_arg);
235 }
236
237 static inline int
dwarf_put(struct dwarf_cursor * c,dwarf_loc_t loc,unw_word_t val)238 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
239 {
240 if (DWARF_IS_NULL_LOC (loc))
241 return -UNW_EBADREG;
242
243 /* If a code-generator were to save a value of type unw_word_t in a
244 floating-point register, we would have to support this case. I
245 suppose it could happen with MMX registers, but does it really
246 happen? */
247 assert (!DWARF_IS_FP_LOC (loc));
248
249 if (DWARF_IS_REG_LOC (loc))
250 return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), &val,
251 1, c->as_arg);
252 else
253 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val,
254 1, c->as_arg);
255 }
256
257 #endif /* !UNW_LOCAL_ONLY */
258
259
260
261 #define tdep_getcontext_trace unw_getcontext
262 #define tdep_init_done UNW_OBJ(init_done)
263 #define tdep_init UNW_OBJ(init)
264 /* Platforms that support UNW_INFO_FORMAT_TABLE need to define
265 tdep_search_unwind_table. */
266 #define tdep_search_unwind_table dwarf_search_unwind_table
267 #define tdep_find_unwind_table dwarf_find_unwind_table
268 #define tdep_uc_addr UNW_OBJ(uc_addr)
269 #define tdep_get_elf_image UNW_ARCH_OBJ(get_elf_image)
270 #define tdep_access_reg UNW_OBJ(access_reg)
271 #define tdep_access_fpreg UNW_OBJ(access_fpreg)
272 #define tdep_fetch_frame(c,ip,n) do {} while(0)
273 #define tdep_cache_frame(c,rs) do {} while(0)
274 #define tdep_reuse_frame(c,rs) do {} while(0)
275 #define tdep_stash_frame(c,rs) do {} while(0)
276 #define tdep_trace(cur,addr,n) (-UNW_ENOINFO)
277
278 #ifdef UNW_LOCAL_ONLY
279 # define tdep_find_proc_info(c,ip,n) \
280 dwarf_find_proc_info((c)->as, (ip), &(c)->pi, (n), \
281 (c)->as_arg)
282 # define tdep_put_unwind_info(as,pi,arg) \
283 dwarf_put_unwind_info((as), (pi), (arg))
284 #else
285 # define tdep_find_proc_info(c,ip,n) \
286 (*(c)->as->acc.find_proc_info)((c)->as, (ip), &(c)->pi, (n), \
287 (c)->as_arg)
288 # define tdep_put_unwind_info(as,pi,arg) \
289 (*(as)->acc.put_unwind_info)((as), (pi), (arg))
290 #endif
291
292 #define tdep_get_as(c) ((c)->dwarf.as)
293 #define tdep_get_as_arg(c) ((c)->dwarf.as_arg)
294 #define tdep_get_ip(c) ((c)->dwarf.ip)
295 #define tdep_big_endian(as) ((as)->big_endian)
296
297 extern int tdep_init_done;
298
299 extern void tdep_init (void);
300 extern int tdep_search_unwind_table (unw_addr_space_t as, unw_word_t ip,
301 unw_dyn_info_t *di, unw_proc_info_t *pi,
302 int need_unwind_info, void *arg);
303 extern void *tdep_uc_addr (unw_tdep_context_t *uc, int reg);
304 /* ANDROID support update. */
305 extern int tdep_get_elf_image (unw_addr_space_t as, struct elf_image *ei,
306 pid_t pid, unw_word_t ip,
307 unsigned long *segbase, unsigned long *mapoff,
308 char **path, void *as_arg);
309 /* End of ANDROID update. */
310 extern int tdep_access_reg (struct cursor *c, unw_regnum_t reg,
311 unw_word_t *valp, int write);
312 extern int tdep_access_fpreg (struct cursor *c, unw_regnum_t reg,
313 unw_fpreg_t *valp, int write);
314
315 #endif /* AARCH64_LIBUNWIND_I_H */
316