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 #include <stdatomic.h>
34
35 #if !defined(UNW_REMOTE_ONLY) && _MIPS_SIM == _ABI64
36 # include "elf64.h"
37 #else
38 # include "elf32.h"
39 #endif
40 /* Add For Cache MAP And ELF */
41 #include "map_info.h"
42 /* Add For Cache MAP And ELF */
43 #include "mempool.h"
44 #include "dwarf.h"
45
46 typedef struct
47 {
48 /* no mips-specific fast trace */
49 }
50 unw_tdep_frame_t;
51
52 struct unw_addr_space
53 {
54 struct unw_accessors acc;
55
56 int big_endian;
57 mips_abi_t abi;
58 unsigned int addr_size;
59
60 unw_caching_policy_t caching_policy;
61 _Atomic uint32_t cache_generation;
62 unw_word_t dyn_generation; /* see dyn-common.h */
63 unw_word_t dyn_info_list_addr; /* (cached) dyn_info_list_addr */
64 struct dwarf_rs_cache global_cache;
65 struct unw_debug_frame_list *debug_frames;
66 /* Add For Cache MAP And ELF */
67 struct map_info *map_list;
68 /* Add For Cache MAP And ELF */
69 };
70
71 #define tdep_big_endian(as) ((as)->big_endian)
72
73 struct cursor
74 {
75 struct dwarf_cursor dwarf; /* must be first */
76 unw_word_t sigcontext_addr;
77 };
78
79 #define DWARF_GET_LOC(l) ((l).val)
80
81 #ifndef UNW_REMOTE_ONLY
82 # if _MIPS_SIM == _ABIN32
83 typedef long long mips_reg_t;
84 # else
85 typedef long mips_reg_t;
86 # endif
87 #endif
88
89 #ifdef UNW_LOCAL_ONLY
90 # define DWARF_NULL_LOC DWARF_LOC (0, 0)
91 # define DWARF_IS_NULL_LOC(l) (DWARF_GET_LOC (l) == 0)
92 # define DWARF_LOC(r, t) ((dwarf_loc_t) { .val = (r) })
93 # define DWARF_IS_REG_LOC(l) 0
94 # define DWARF_REG_LOC(c,r) (DWARF_LOC((unw_word_t) (intptr_t) \
95 tdep_uc_addr((c)->as_arg, (r)), 0))
96 # define DWARF_MEM_LOC(c,m) DWARF_LOC ((m), 0)
97 # define DWARF_FPREG_LOC(c,r) (DWARF_LOC((unw_word_t) (intptr_t) \
98 tdep_uc_addr((c)->as_arg, (r)), 0))
99
100 /* FIXME: Implement these for the MIPS FPU. */
101 static inline int
dwarf_getfp(struct dwarf_cursor * c,dwarf_loc_t loc,unw_fpreg_t * val)102 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val)
103 {
104 if (!DWARF_GET_LOC (loc))
105 return -1;
106 *val = *(unw_fpreg_t *) (intptr_t) DWARF_GET_LOC (loc);
107 return 0;
108 }
109
110 static inline int
dwarf_putfp(struct dwarf_cursor * c,dwarf_loc_t loc,unw_fpreg_t val)111 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
112 {
113 if (!DWARF_GET_LOC (loc))
114 return -1;
115 *(unw_fpreg_t *) (intptr_t) DWARF_GET_LOC (loc) = val;
116 return 0;
117 }
118
119 static inline int
dwarf_get(struct dwarf_cursor * c,dwarf_loc_t loc,unw_word_t * val)120 dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val)
121 {
122 if (!DWARF_GET_LOC (loc))
123 return -1;
124 *val = *(mips_reg_t *) (intptr_t) DWARF_GET_LOC (loc);
125 return 0;
126 }
127
128 static inline int
dwarf_put(struct dwarf_cursor * c,dwarf_loc_t loc,unw_word_t val)129 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
130 {
131 if (!DWARF_GET_LOC (loc))
132 return -1;
133 *(mips_reg_t *) (intptr_t) DWARF_GET_LOC (loc) = val;
134 return 0;
135 }
136
137 #else /* !UNW_LOCAL_ONLY */
138 # define DWARF_LOC_TYPE_FP (1 << 0)
139 # define DWARF_LOC_TYPE_REG (1 << 1)
140 # define DWARF_NULL_LOC DWARF_LOC (0, 0)
141 # define DWARF_IS_NULL_LOC(l) \
142 ({ dwarf_loc_t _l = (l); _l.val == 0 && _l.type == 0; })
143 # define DWARF_LOC(r, t) ((dwarf_loc_t) { .val = (r), .type = (t) })
144 # define DWARF_IS_REG_LOC(l) (((l).type & DWARF_LOC_TYPE_REG) != 0)
145 # define DWARF_IS_FP_LOC(l) (((l).type & DWARF_LOC_TYPE_FP) != 0)
146 # define DWARF_REG_LOC(c,r) DWARF_LOC((r), DWARF_LOC_TYPE_REG)
147 # define DWARF_MEM_LOC(c,m) DWARF_LOC ((m), 0)
148 # define DWARF_FPREG_LOC(c,r) DWARF_LOC((r), (DWARF_LOC_TYPE_REG \
149 | DWARF_LOC_TYPE_FP))
150
151 static inline int
read_s32(struct dwarf_cursor * c,unw_word_t addr,unw_word_t * val)152 read_s32 (struct dwarf_cursor *c, unw_word_t addr, unw_word_t *val)
153 {
154 int offset = addr & 4;
155 int ret;
156 unw_word_t memval;
157
158 ret = (*c->as->acc.access_mem) (c->as, addr - offset, &memval, 0, c->as_arg);
159 if (ret < 0)
160 return ret;
161
162 if ((offset != 0) == tdep_big_endian (c->as))
163 *val = (int32_t) memval;
164 else
165 *val = (int32_t) (memval >> 32);
166
167 return 0;
168 }
169
170 static inline int
write_s32(struct dwarf_cursor * c,unw_word_t addr,const unw_word_t * val)171 write_s32 (struct dwarf_cursor *c, unw_word_t addr, const 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 memval = (memval & ~0xffffffffLL) | (uint32_t) *val;
183 else
184 memval = (memval & 0xffffffffLL) | (uint32_t) (*val << 32);
185
186 return (*c->as->acc.access_mem) (c->as, addr - offset, &memval, 1, c->as_arg);
187 }
188
189 /* FIXME: Implement these for the MIPS FPU. */
190 static inline int
dwarf_getfp(struct dwarf_cursor * c,dwarf_loc_t loc,unw_fpreg_t * val)191 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val)
192 {
193 char *valp = (char *) &val;
194 unw_word_t addr;
195 int ret;
196
197 if (DWARF_IS_NULL_LOC (loc))
198 return -UNW_EBADREG;
199
200 if (DWARF_IS_REG_LOC (loc))
201 return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
202 val, 0, c->as_arg);
203
204 addr = DWARF_GET_LOC (loc);
205 if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp,
206 0, c->as_arg)) < 0)
207 return ret;
208
209 return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1, 0,
210 c->as_arg);
211 }
212
213 static inline int
dwarf_putfp(struct dwarf_cursor * c,dwarf_loc_t loc,unw_fpreg_t val)214 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
215 {
216 char *valp = (char *) &val;
217 unw_word_t addr;
218 int ret;
219
220 if (DWARF_IS_NULL_LOC (loc))
221 return -UNW_EBADREG;
222
223 if (DWARF_IS_REG_LOC (loc))
224 return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
225 &val, 1, c->as_arg);
226
227 addr = DWARF_GET_LOC (loc);
228 if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp,
229 1, c->as_arg)) < 0)
230 return ret;
231
232 return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1,
233 1, c->as_arg);
234 }
235
236 static inline int
dwarf_get(struct dwarf_cursor * c,dwarf_loc_t loc,unw_word_t * val)237 dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val)
238 {
239 if (DWARF_IS_NULL_LOC (loc))
240 return -UNW_EBADREG;
241
242 /* If a code-generator were to save a value of type unw_word_t in a
243 floating-point register, we would have to support this case. I
244 suppose it could happen with MMX registers, but does it really
245 happen? */
246 assert (!DWARF_IS_FP_LOC (loc));
247
248 if (DWARF_IS_REG_LOC (loc))
249 return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), val,
250 0, c->as_arg);
251 else if (c->as->abi == UNW_MIPS_ABI_O32)
252 return read_s32 (c, DWARF_GET_LOC (loc), val);
253 else if (c->as->abi == UNW_MIPS_ABI_N32) {
254 if (tdep_big_endian(c->as))
255 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc) + 4, val,
256 0, c->as_arg);
257 else
258 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val,
259 0, c->as_arg);
260 }
261 else
262 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val,
263 0, c->as_arg);
264 }
265
266 static inline int
dwarf_put(struct dwarf_cursor * c,dwarf_loc_t loc,unw_word_t val)267 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
268 {
269 if (DWARF_IS_NULL_LOC (loc))
270 return -UNW_EBADREG;
271
272 /* If a code-generator were to save a value of type unw_word_t in a
273 floating-point register, we would have to support this case. I
274 suppose it could happen with MMX registers, but does it really
275 happen? */
276 assert (!DWARF_IS_FP_LOC (loc));
277
278 if (DWARF_IS_REG_LOC (loc))
279 return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), &val,
280 1, c->as_arg);
281 else if (c->as->abi == UNW_MIPS_ABI_O32)
282 return write_s32 (c, DWARF_GET_LOC (loc), &val);
283 else
284 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val,
285 1, c->as_arg);
286 }
287
288 #endif /* !UNW_LOCAL_ONLY */
289
290 #define tdep_getcontext_trace unw_getcontext
291 #define tdep_init_done UNW_OBJ(init_done)
292 #define tdep_init UNW_OBJ(init)
293 /* Platforms that support UNW_INFO_FORMAT_TABLE need to define
294 tdep_search_unwind_table. */
295 #define tdep_search_unwind_table dwarf_search_unwind_table
296 #define tdep_find_unwind_table dwarf_find_unwind_table
297 #define tdep_uc_addr UNW_ARCH_OBJ(uc_addr)
298 #define tdep_get_elf_image UNW_ARCH_OBJ(get_elf_image)
299 #define tdep_get_exe_image_path UNW_ARCH_OBJ(get_exe_image_path)
300 #define tdep_access_reg UNW_OBJ(access_reg)
301 #define tdep_access_fpreg UNW_OBJ(access_fpreg)
302 #define tdep_fetch_frame(c,ip,n) do {} while(0)
303 #define tdep_cache_frame(c) 0
304 #define tdep_reuse_frame(c,frame) do {} while(0)
305 #define tdep_stash_frame(c,rs) do {} while(0)
306 #define tdep_trace(cur,addr,n) (-UNW_ENOINFO)
307
308 #ifdef UNW_LOCAL_ONLY
309 # define tdep_find_proc_info(c,ip,n) \
310 dwarf_find_proc_info((c)->as, (ip), &(c)->pi, (n), \
311 (c)->as_arg)
312 # define tdep_put_unwind_info(as,pi,arg) \
313 dwarf_put_unwind_info((as), (pi), (arg))
314 #else
315 # define tdep_find_proc_info(c,ip,n) \
316 (*(c)->as->acc.find_proc_info)((c)->as, (ip), &(c)->pi, (n), \
317 (c)->as_arg)
318 # define tdep_put_unwind_info(as,pi,arg) \
319 (*(as)->acc.put_unwind_info)((as), (pi), (arg))
320 #endif
321
322 #define tdep_get_as(c) ((c)->dwarf.as)
323 #define tdep_get_as_arg(c) ((c)->dwarf.as_arg)
324 #define tdep_get_ip(c) ((c)->dwarf.ip)
325
326 extern atomic_bool tdep_init_done;
327
328 extern void tdep_init (void);
329 extern int tdep_search_unwind_table (unw_addr_space_t as, unw_word_t ip,
330 unw_dyn_info_t *di, unw_proc_info_t *pi,
331 int need_unwind_info, void *arg);
332 extern void *tdep_uc_addr (ucontext_t *uc, int reg);
333 /* Add For Cache MAP And ELF */
334 extern struct map_info *tdep_get_elf_image (unw_addr_space_t as, pid_t pid,
335 unw_word_t ip);
336 /* Add For Cache MAP And ELF */
337 extern void tdep_get_exe_image_path (char *path);
338 extern int tdep_access_reg (struct cursor *c, unw_regnum_t reg,
339 unw_word_t *valp, int write);
340 extern int tdep_access_fpreg (struct cursor *c, unw_regnum_t reg,
341 unw_fpreg_t *valp, int write);
342
343 #endif /* MIPS_LIBUNWIND_I_H */
344