1 /* libunwind - a platform-independent unwind library
2 Copyright (C) 2008 CodeSourcery
3
4 This file is part of libunwind.
5
6 Permission is hereby granted, free of charge, to any person obtaining
7 a copy of this software and associated documentation files (the
8 "Software"), to deal in the Software without restriction, including
9 without limitation the rights to use, copy, modify, merge, publish,
10 distribute, sublicense, and/or sell copies of the Software, and to
11 permit persons to whom the Software is furnished to do so, subject to
12 the following conditions:
13
14 The above copyright notice and this permission notice shall be
15 included in all copies or substantial portions of the Software.
16
17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
21 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
24
25 #ifndef MIPS_LIBUNWIND_I_H
26 #define MIPS_LIBUNWIND_I_H
27
28 /* Target-dependent definitions that are internal to libunwind but need
29 to be shared with target-independent code. */
30
31 #include <stdlib.h>
32 #include <libunwind.h>
33
34 #if !defined(UNW_REMOTE_ONLY) && _MIPS_SIM == _ABI64
35 # include "elf64.h"
36 #else
37 # include "elf32.h"
38 #endif
39 /* ANDROID support update. */
40 #include "map_info.h"
41 /* End of ANDROID update. */
42 #include "mempool.h"
43 #include "dwarf.h"
44
45 typedef struct
46 {
47 /* no mips-specific fast trace */
48 }
49 unw_tdep_frame_t;
50
51 struct unw_addr_space
52 {
53 struct unw_accessors acc;
54
55 int big_endian;
56 mips_abi_t abi;
57 unsigned int addr_size;
58
59 unw_caching_policy_t caching_policy;
60 #ifdef HAVE_ATOMIC_OPS_H
61 AO_t cache_generation;
62 #else
63 uint32_t cache_generation;
64 #endif
65 unw_word_t dyn_generation; /* see dyn-common.h */
66 unw_word_t dyn_info_list_addr; /* (cached) dyn_info_list_addr */
67 struct dwarf_rs_cache global_cache;
68 struct unw_debug_frame_list *debug_frames;
69 /* ANDROID support update. */
70 struct map_info *map_list;
71 /* End of ANDROID update. */
72 };
73
74 #define tdep_big_endian(as) ((as)->big_endian)
75
76 struct cursor
77 {
78 struct dwarf_cursor dwarf; /* must be first */
79 unw_word_t sigcontext_addr;
80 };
81
82 #define DWARF_GET_LOC(l) ((l).val)
83
84 #ifndef UNW_REMOTE_ONLY
85 # if _MIPS_SIM == _ABIN32
86 typedef long long mips_reg_t;
87 # else
88 typedef long mips_reg_t;
89 # endif
90 #endif
91
92 #ifdef UNW_LOCAL_ONLY
93 # define DWARF_NULL_LOC DWARF_LOC (0, 0)
94 # define DWARF_IS_NULL_LOC(l) (DWARF_GET_LOC (l) == 0)
95 # define DWARF_LOC(r, t) ((dwarf_loc_t) { .val = (r) })
96 # define DWARF_IS_REG_LOC(l) 0
97 # define DWARF_REG_LOC(c,r) (DWARF_LOC((unw_word_t) (intptr_t) \
98 tdep_uc_addr((c)->as_arg, (r)), 0))
99 # define DWARF_MEM_LOC(c,m) DWARF_LOC ((m), 0)
100 # define DWARF_FPREG_LOC(c,r) (DWARF_LOC((unw_word_t) (intptr_t) \
101 tdep_uc_addr((c)->as_arg, (r)), 0))
102
103 /* FIXME: Implement these for the MIPS FPU. */
104 static inline int
dwarf_getfp(struct dwarf_cursor * c,dwarf_loc_t loc,unw_fpreg_t * val)105 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val)
106 {
107 /* ANDROID support update. */
108 unw_fpreg_t *addr = (unw_fpreg_t *) (uintptr_t) DWARF_GET_LOC (loc);
109 if (!addr || !map_local_is_readable ((unw_word_t) (uintptr_t) addr, sizeof(unw_fpreg_t)))
110 return -1;
111
112 *val = *addr;
113 return 0;
114 /* End of ANDROID update. */
115 }
116
117 static inline int
dwarf_putfp(struct dwarf_cursor * c,dwarf_loc_t loc,unw_fpreg_t val)118 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
119 {
120 /* ANDROID support update. */
121 unw_fpreg_t *addr = (unw_fpreg_t *) (uintptr_t) DWARF_GET_LOC (loc);
122 if (!addr || !map_local_is_writable ((unw_word_t) (uintptr_t) addr, sizeof(unw_fpreg_t)))
123 return -1;
124
125 *addr = val;
126 return 0;
127 /* End of ANDROID update. */
128 }
129
130 static inline int
dwarf_get(struct dwarf_cursor * c,dwarf_loc_t loc,unw_word_t * val)131 dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val)
132 {
133 /* ANDROID support update. */
134 mips_reg_t *addr = (mips_reg_t *) (uintptr_t) DWARF_GET_LOC (loc);
135 if (!addr || !map_local_is_readable ((unw_word_t) (uintptr_t) addr, sizeof(mips_reg_t)))
136 return -1;
137
138 *val = *addr;
139 return 0;
140 /* End of ANDROID update. */
141 }
142
143 static inline int
dwarf_put(struct dwarf_cursor * c,dwarf_loc_t loc,unw_word_t val)144 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
145 {
146 /* ANDROID support update. */
147 mips_reg_t *addr = (mips_reg_t *) (uintptr_t) DWARF_GET_LOC (loc);
148 if (!addr || !map_local_is_writable ((unw_word_t) (uintptr_t) addr, sizeof(mips_reg_t)))
149 return -1;
150
151 *addr = val;
152 return 0;
153 /* End of ANDROID update. */
154 }
155
156 #else /* !UNW_LOCAL_ONLY */
157 # define DWARF_LOC_TYPE_FP (1 << 0)
158 # define DWARF_LOC_TYPE_REG (1 << 1)
159 # define DWARF_NULL_LOC DWARF_LOC (0, 0)
160 # define DWARF_IS_NULL_LOC(l) \
161 ({ dwarf_loc_t _l = (l); _l.val == 0 && _l.type == 0; })
162 # define DWARF_LOC(r, t) ((dwarf_loc_t) { .val = (r), .type = (t) })
163 # define DWARF_IS_REG_LOC(l) (((l).type & DWARF_LOC_TYPE_REG) != 0)
164 # define DWARF_IS_FP_LOC(l) (((l).type & DWARF_LOC_TYPE_FP) != 0)
165 # define DWARF_REG_LOC(c,r) DWARF_LOC((r), DWARF_LOC_TYPE_REG)
166 # define DWARF_MEM_LOC(c,m) DWARF_LOC ((m), 0)
167 # define DWARF_FPREG_LOC(c,r) DWARF_LOC((r), (DWARF_LOC_TYPE_REG \
168 | DWARF_LOC_TYPE_FP))
169
170 static inline int
read_s32(struct dwarf_cursor * c,unw_word_t addr,unw_word_t * val)171 read_s32 (struct dwarf_cursor *c, unw_word_t addr, unw_word_t *val)
172 {
173 int offset = addr & 4;
174 int ret;
175 unw_word_t memval;
176
177 ret = (*c->as->acc.access_mem) (c->as, addr - offset, &memval, 0, c->as_arg);
178 if (ret < 0)
179 return ret;
180
181 if ((offset != 0) == tdep_big_endian (c->as))
182 *val = (int32_t) memval;
183 else
184 *val = (int32_t) (memval >> 32);
185
186 return 0;
187 }
188
189 static inline int
write_s32(struct dwarf_cursor * c,unw_word_t addr,const unw_word_t * val)190 write_s32 (struct dwarf_cursor *c, unw_word_t addr, const unw_word_t *val)
191 {
192 int offset = addr & 4;
193 int ret;
194 unw_word_t memval;
195
196 ret = (*c->as->acc.access_mem) (c->as, addr - offset, &memval, 0, c->as_arg);
197 if (ret < 0)
198 return ret;
199
200 if ((offset != 0) == tdep_big_endian (c->as))
201 memval = (memval & ~0xffffffffLL) | (uint32_t) *val;
202 else
203 memval = (memval & 0xffffffffLL) | (uint32_t) (*val << 32);
204
205 return (*c->as->acc.access_mem) (c->as, addr - offset, &memval, 1, c->as_arg);
206 }
207
208 /* FIXME: Implement these for the MIPS FPU. */
209 static inline int
dwarf_getfp(struct dwarf_cursor * c,dwarf_loc_t loc,unw_fpreg_t * val)210 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val)
211 {
212 char *valp = (char *) &val;
213 unw_word_t addr;
214 int ret;
215
216 if (DWARF_IS_NULL_LOC (loc))
217 return -UNW_EBADREG;
218
219 if (DWARF_IS_REG_LOC (loc))
220 return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
221 val, 0, c->as_arg);
222
223 addr = DWARF_GET_LOC (loc);
224 if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp,
225 0, c->as_arg)) < 0)
226 return ret;
227
228 return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1, 0,
229 c->as_arg);
230 }
231
232 static inline int
dwarf_putfp(struct dwarf_cursor * c,dwarf_loc_t loc,unw_fpreg_t val)233 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
234 {
235 char *valp = (char *) &val;
236 unw_word_t addr;
237 int ret;
238
239 if (DWARF_IS_NULL_LOC (loc))
240 return -UNW_EBADREG;
241
242 if (DWARF_IS_REG_LOC (loc))
243 return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
244 &val, 1, c->as_arg);
245
246 addr = DWARF_GET_LOC (loc);
247 if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp,
248 1, c->as_arg)) < 0)
249 return ret;
250
251 return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1,
252 1, c->as_arg);
253 }
254
255 static inline int
dwarf_get(struct dwarf_cursor * c,dwarf_loc_t loc,unw_word_t * val)256 dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val)
257 {
258 if (DWARF_IS_NULL_LOC (loc))
259 return -UNW_EBADREG;
260
261 /* If a code-generator were to save a value of type unw_word_t in a
262 floating-point register, we would have to support this case. I
263 suppose it could happen with MMX registers, but does it really
264 happen? */
265 assert (!DWARF_IS_FP_LOC (loc));
266
267 if (DWARF_IS_REG_LOC (loc))
268 return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), val,
269 0, c->as_arg);
270 else if (c->as->abi == UNW_MIPS_ABI_O32)
271 return read_s32 (c, DWARF_GET_LOC (loc), val);
272 else
273 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val,
274 0, c->as_arg);
275 }
276
277 static inline int
dwarf_put(struct dwarf_cursor * c,dwarf_loc_t loc,unw_word_t val)278 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
279 {
280 if (DWARF_IS_NULL_LOC (loc))
281 return -UNW_EBADREG;
282
283 /* If a code-generator were to save a value of type unw_word_t in a
284 floating-point register, we would have to support this case. I
285 suppose it could happen with MMX registers, but does it really
286 happen? */
287 assert (!DWARF_IS_FP_LOC (loc));
288
289 if (DWARF_IS_REG_LOC (loc))
290 return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), &val,
291 1, c->as_arg);
292 else if (c->as->abi == UNW_MIPS_ABI_O32)
293 return write_s32 (c, DWARF_GET_LOC (loc), &val);
294 else
295 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val,
296 1, c->as_arg);
297 }
298
299 #endif /* !UNW_LOCAL_ONLY */
300
301 #define tdep_getcontext_trace unw_getcontext
302 #define tdep_init_done UNW_OBJ(init_done)
303 #define tdep_init UNW_OBJ(init)
304 /* Platforms that support UNW_INFO_FORMAT_TABLE need to define
305 tdep_search_unwind_table. */
306 #define tdep_search_unwind_table dwarf_search_unwind_table
307 #define tdep_find_unwind_table dwarf_find_unwind_table
308 #define tdep_uc_addr UNW_ARCH_OBJ(uc_addr)
309 #define tdep_get_elf_image UNW_ARCH_OBJ(get_elf_image)
310 #define tdep_access_reg UNW_OBJ(access_reg)
311 #define tdep_access_fpreg UNW_OBJ(access_fpreg)
312 #define tdep_fetch_frame(c,ip,n) do {} while(0)
313 #define tdep_cache_frame(c,rs) do {} while(0)
314 #define tdep_reuse_frame(c,rs) do {} while(0)
315 #define tdep_stash_frame(c,rs) do {} while(0)
316 #define tdep_trace(cur,addr,n) (-UNW_ENOINFO)
317
318 #ifdef UNW_LOCAL_ONLY
319 # define tdep_find_proc_info(c,ip,n) \
320 dwarf_find_proc_info((c)->as, (ip), &(c)->pi, (n), \
321 (c)->as_arg)
322 # define tdep_put_unwind_info(as,pi,arg) \
323 dwarf_put_unwind_info((as), (pi), (arg))
324 #else
325 # define tdep_find_proc_info(c,ip,n) \
326 (*(c)->as->acc.find_proc_info)((c)->as, (ip), &(c)->pi, (n), \
327 (c)->as_arg)
328 # define tdep_put_unwind_info(as,pi,arg) \
329 (*(as)->acc.put_unwind_info)((as), (pi), (arg))
330 #endif
331
332 #define tdep_get_as(c) ((c)->dwarf.as)
333 #define tdep_get_as_arg(c) ((c)->dwarf.as_arg)
334 #define tdep_get_ip(c) ((c)->dwarf.ip)
335
336 extern int tdep_init_done;
337
338 extern void tdep_init (void);
339 extern int tdep_search_unwind_table (unw_addr_space_t as, unw_word_t ip,
340 unw_dyn_info_t *di, unw_proc_info_t *pi,
341 int need_unwind_info, void *arg);
342 extern void *tdep_uc_addr (ucontext_t *uc, int reg);
343 /* ANDROID support update. */
344 extern int tdep_get_elf_image (unw_addr_space_t as, struct elf_image *ei,
345 pid_t pid, unw_word_t ip,
346 unsigned long *segbase, unsigned long *mapoff,
347 char **path, void *as_arg);
348 /* End of ANDROID update. */
349 extern int tdep_access_reg (struct cursor *c, unw_regnum_t reg,
350 unw_word_t *valp, int write);
351 extern int tdep_access_fpreg (struct cursor *c, unw_regnum_t reg,
352 unw_fpreg_t *valp, int write);
353
354 #endif /* MIPS_LIBUNWIND_I_H */
355