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 ARM_LIBUNWIND_I_H
26 #define ARM_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 #include "elf32.h"
36 /* Add For Cache MAP And ELF */
37 #include "map_info.h"
38 /* Add For Cache MAP And ELF */
39 #include "mempool.h"
40 #include "dwarf.h"
41 #include "ex_tables.h"
42
43 typedef enum
44 {
45 UNW_ARM_FRAME_SYSCALL = -3, /* r7 saved in r12, sp offset zero */
46 UNW_ARM_FRAME_STANDARD = -2, /* regular r7, sp +/- offset */
47 UNW_ARM_FRAME_SIGRETURN = -1, /* special sigreturn frame */
48 UNW_ARM_FRAME_OTHER = 0, /* not cacheable (special or unrecognised) */
49 UNW_ARM_FRAME_GUESSED = 1 /* guessed it was regular, but not known */
50 }
51 unw_tdep_frame_type_t;
52
53 typedef struct
54 {
55 uint32_t virtual_address;
56 int32_t frame_type : 3; /* unw_tdep_frame_type_t classification */
57 int32_t last_frame : 1; /* non-zero if last frame in chain */
58 int32_t cfa_reg_sp : 1; /* cfa dwarf base register is sp vs. r7 */
59 int32_t cfa_reg_offset : 30; /* cfa is at this offset from base register value */
60 int32_t r7_cfa_offset : 30; /* r7 saved at this offset from cfa (-1 = not saved) */
61 int32_t lr_cfa_offset : 30; /* lr saved at this offset from cfa (-1 = not saved) */
62 int32_t sp_cfa_offset : 30; /* sp saved at this offset from cfa (-1 = not saved) */
63 }
64 unw_tdep_frame_t;
65
66 struct unw_addr_space
67 {
68 struct unw_accessors acc;
69 int big_endian;
70 unw_caching_policy_t caching_policy;
71 _Atomic uint32_t cache_generation;
72 unw_word_t dyn_generation; /* see dyn-common.h */
73 unw_word_t dyn_info_list_addr; /* (cached) dyn_info_list_addr */
74 struct dwarf_rs_cache global_cache;
75 struct unw_debug_frame_list *debug_frames;
76 /* Add For Cache MAP And ELF */
77 struct map_info *map_list;
78 /* Add For Cache MAP And ELF */
79 struct cursor *cursor;
80 int pid;
81 };
82
83 static inline struct cursor *
get_cursor_from_as(unw_addr_space_t as)84 get_cursor_from_as(unw_addr_space_t as)
85 {
86 if (as->cursor) {
87 return (struct cursor *)(as->cursor);
88 }
89
90 return NULL;
91 }
92
93 struct cursor
94 {
95 struct dwarf_cursor dwarf; /* must be first */
96
97 unw_tdep_frame_t frame_info; /* quick tracing assist info */
98
99 enum
100 {
101 ARM_SCF_NONE, /* no signal frame */
102 ARM_SCF_LINUX_SIGFRAME, /* non-RT signal frame, kernel >=2.6.18 */
103 ARM_SCF_LINUX_RT_SIGFRAME, /* RT signal frame, kernel >=2.6.18 */
104 ARM_SCF_LINUX_OLD_SIGFRAME, /* non-RT signal frame, kernel < 2.6.18 */
105 ARM_SCF_LINUX_OLD_RT_SIGFRAME, /* RT signal frame, kernel < 2.6.18 */
106 ARM_SCF_FREEBSD_SIGFRAME, /* FreeBSD sigframe */
107 ARM_SCF_FREEBSD_SYSCALL, /* FreeBSD syscall stub */
108 }
109 sigcontext_format;
110 unw_word_t sigcontext_addr;
111 unw_word_t sigcontext_sp;
112 unw_word_t sigcontext_pc;
113 int validate;
114 };
115
116 #define DWARF_GET_LOC(l) ((l).val)
117
118 #ifdef UNW_LOCAL_ONLY
119 # define DWARF_NULL_LOC DWARF_LOC (0, 0)
120 # define DWARF_IS_NULL_LOC(l) (DWARF_GET_LOC (l) == 0)
121 # define DWARF_LOC(r, t) ((dwarf_loc_t) { .val = (r) })
122 # define DWARF_IS_REG_LOC(l) 0
123 # define DWARF_REG_LOC(c,r) (DWARF_LOC((unw_word_t) \
124 tdep_uc_addr((c)->as_arg, (r)), 0))
125 # define DWARF_MEM_LOC(c,m) DWARF_LOC ((m), 0)
126 # define DWARF_FPREG_LOC(c,r) (DWARF_LOC((unw_word_t) \
127 tdep_uc_addr((c)->as_arg, (r)), 0))
128
129 static inline int
dwarf_getfp(struct dwarf_cursor * c,dwarf_loc_t loc,unw_fpreg_t * val)130 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val)
131 {
132 unw_fpreg_t *addr = (unw_fpreg_t *) (uintptr_t) DWARF_GET_LOC (loc);
133 if (!addr || maps_is_readable(c->as->map_list, (unw_word_t) (uintptr_t) addr))
134 return -1;
135 *val = *addr;
136 return 0;
137 }
138
139 static inline int
dwarf_putfp(struct dwarf_cursor * c,dwarf_loc_t loc,unw_fpreg_t val)140 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
141 {
142 unw_fpreg_t *addr = (unw_fpreg_t *) (uintptr_t) DWARF_GET_LOC (loc);
143 if (!addr || maps_is_writable(c->as->map_list, (unw_word_t) (uintptr_t) addr))
144 return -1;
145 *addr = val;
146 return 0;
147 }
148
149 static inline int
dwarf_get(struct dwarf_cursor * c,dwarf_loc_t loc,unw_word_t * val)150 dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val)
151 {
152 if (!DWARF_GET_LOC (loc))
153 return -1;
154 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val, 0, c->as_arg);
155 }
156
157 static inline int
dwarf_put(struct dwarf_cursor * c,dwarf_loc_t loc,unw_word_t val)158 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
159 {
160 if (!DWARF_GET_LOC (loc))
161 return -1;
162 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val, 1, c->as_arg);
163 }
164
165 #else /* !UNW_LOCAL_ONLY */
166 # define DWARF_LOC_TYPE_FP (1 << 0)
167 # define DWARF_LOC_TYPE_REG (1 << 1)
168 # define DWARF_NULL_LOC DWARF_LOC (0, 0)
169
170 static inline int
dwarf_is_null_loc(dwarf_loc_t l)171 dwarf_is_null_loc(dwarf_loc_t l)
172 {
173 return l.val == 0 && l.type == 0;
174 }
175
176 # define DWARF_IS_NULL_LOC(l) dwarf_is_null_loc(l)
177 # define DWARF_LOC(r, t) ((dwarf_loc_t) { .val = (r), .type = (t) })
178 # define DWARF_IS_REG_LOC(l) (((l).type & DWARF_LOC_TYPE_REG) != 0)
179 # define DWARF_IS_FP_LOC(l) (((l).type & DWARF_LOC_TYPE_FP) != 0)
180 # define DWARF_REG_LOC(c,r) DWARF_LOC((r), DWARF_LOC_TYPE_REG)
181 # define DWARF_MEM_LOC(c,m) DWARF_LOC ((m), 0)
182 # define DWARF_FPREG_LOC(c,r) DWARF_LOC((r), (DWARF_LOC_TYPE_REG \
183 | DWARF_LOC_TYPE_FP))
184
185 static inline int
dwarf_getfp(struct dwarf_cursor * c,dwarf_loc_t loc,unw_fpreg_t * val)186 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val)
187 {
188 char *valp = (char *) &val;
189 unw_word_t addr;
190 int ret;
191
192 if (DWARF_IS_NULL_LOC (loc))
193 return -UNW_EBADREG;
194
195 if (DWARF_IS_REG_LOC (loc))
196 return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
197 val, 0, c->as_arg);
198
199 addr = DWARF_GET_LOC (loc);
200 if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp,
201 0, c->as_arg)) < 0)
202 return ret;
203
204 return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1, 0,
205 c->as_arg);
206 }
207
208 static inline int
dwarf_putfp(struct dwarf_cursor * c,dwarf_loc_t loc,unw_fpreg_t val)209 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
210 {
211 char *valp = (char *) &val;
212 unw_word_t addr;
213 int ret;
214
215 if (DWARF_IS_NULL_LOC (loc))
216 return -UNW_EBADREG;
217
218 if (DWARF_IS_REG_LOC (loc))
219 return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
220 &val, 1, c->as_arg);
221
222 addr = DWARF_GET_LOC (loc);
223 if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp,
224 1, c->as_arg)) < 0)
225 return ret;
226
227 return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1,
228 1, c->as_arg);
229 }
230
231 static inline int
dwarf_get(struct dwarf_cursor * c,dwarf_loc_t loc,unw_word_t * val)232 dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val)
233 {
234 int reg_num;
235 if (DWARF_IS_NULL_LOC (loc))
236 return -UNW_EBADREG;
237
238 /* If a code-generator were to save a value of type unw_word_t in a
239 floating-point register, we would have to support this case. I
240 suppose it could happen with MMX registers, but does it really
241 happen? */
242 assert (!DWARF_IS_FP_LOC (loc));
243
244 if (DWARF_IS_REG_LOC (loc)) {
245 reg_num = DWARF_GET_LOC (loc);
246 if (reg_num >= 0 && reg_num < c->reg_sz) {
247 *val = c->ctx[reg_num];
248 return 1;
249 } else {
250 return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), val,
251 0, c->as_arg);
252 }
253 }
254 else
255 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val,
256 0, c->as_arg);
257 }
258
259 static inline int
dwarf_put(struct dwarf_cursor * c,dwarf_loc_t loc,unw_word_t val)260 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
261 {
262 if (DWARF_IS_NULL_LOC (loc))
263 return -UNW_EBADREG;
264
265 /* If a code-generator were to save a value of type unw_word_t in a
266 floating-point register, we would have to support this case. I
267 suppose it could happen with MMX registers, but does it really
268 happen? */
269 assert (!DWARF_IS_FP_LOC (loc));
270
271 if (DWARF_IS_REG_LOC (loc))
272 return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), &val,
273 1, c->as_arg);
274 else
275 return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val,
276 1, c->as_arg);
277 }
278
279 #endif /* !UNW_LOCAL_ONLY */
280
281 #define tdep_getcontext_trace unw_getcontext
282 #define tdep_init_done UNW_OBJ(init_done)
283 #define tdep_init_mem_validate UNW_OBJ(init_mem_validate)
284 #define tdep_init UNW_OBJ(init)
285 #define arm_find_proc_info UNW_OBJ(find_proc_info)
286 #define arm_find_proc_info2 UNW_OBJ(find_proc_info2)
287 #define arm_put_unwind_info UNW_OBJ(put_unwind_info)
288 /* Platforms that support UNW_INFO_FORMAT_TABLE need to define
289 tdep_search_unwind_table. */
290 #define tdep_search_unwind_table UNW_OBJ(search_unwind_table)
291 #define tdep_find_unwind_table dwarf_find_unwind_table
292 #define tdep_uc_addr UNW_ARCH_OBJ(uc_addr)
293 #define tdep_get_elf_image UNW_ARCH_OBJ(get_elf_image)
294 #define tdep_get_exe_image_path UNW_ARCH_OBJ(get_exe_image_path)
295 #define tdep_access_reg UNW_OBJ(access_reg)
296 #define tdep_access_fpreg UNW_OBJ(access_fpreg)
297 #define tdep_fetch_frame(c,ip,n) do {} while(0)
298 #define tdep_cache_frame(c) 0
299 #define tdep_reuse_frame(c,frame) do {} while(0)
300 #define tdep_stash_frame UNW_OBJ(tdep_stash_frame)
301 #define tdep_trace UNW_OBJ(tdep_trace)
302
303 #ifdef UNW_LOCAL_ONLY
304 # define tdep_find_proc_info(c,ip,n) \
305 arm_find_proc_info((c)->as, (ip), &(c)->pi, (n), \
306 (c)->as_arg)
307 # define tdep_put_unwind_info(as,pi,arg) \
308 arm_put_unwind_info((as), (pi), (arg))
309 #else
310 # define tdep_find_proc_info(c,ip,n) \
311 (*(c)->as->acc.find_proc_info)((c)->as, (ip), &(c)->pi, (n), \
312 (c)->as_arg)
313 # define tdep_put_unwind_info(as,pi,arg) \
314 (*(as)->acc.put_unwind_info)((as), (pi), (arg))
315 #endif
316
317 #define tdep_get_as(c) ((c)->dwarf.as)
318 #define tdep_get_as_arg(c) ((c)->dwarf.as_arg)
319 #define tdep_get_ip(c) ((c)->dwarf.ip)
320 #define tdep_big_endian(as) ((as)->big_endian)
321
322 extern atomic_bool tdep_init_done;
323
324 extern void tdep_init (void);
325 extern void tdep_init_mem_validate (void);
326 extern int arm_find_proc_info (unw_addr_space_t as, unw_word_t ip,
327 unw_proc_info_t *pi, int need_unwind_info,
328 void *arg);
329 extern int arm_find_proc_info2 (unw_addr_space_t as, unw_word_t ip,
330 unw_proc_info_t *pi, int need_unwind_info,
331 void *arg, int methods);
332 extern void arm_put_unwind_info (unw_addr_space_t as,
333 unw_proc_info_t *pi, void *arg);
334 extern int tdep_search_unwind_table (unw_addr_space_t as, unw_word_t ip,
335 unw_dyn_info_t *di, unw_proc_info_t *pi,
336 int need_unwind_info, void *arg);
337 extern void *tdep_uc_addr (unw_tdep_context_t *uc, int reg);
338 /* Add For Cache MAP And ELF */
339 extern struct map_info *tdep_get_elf_image (unw_addr_space_t as, pid_t pid,
340 unw_word_t ip);
341 /* Add For Cache MAP And ELF */
342 extern void tdep_get_exe_image_path (char *path);
343 extern int tdep_access_reg (struct cursor *c, unw_regnum_t reg,
344 unw_word_t *valp, int write);
345 extern int tdep_access_fpreg (struct cursor *c, unw_regnum_t reg,
346 unw_fpreg_t *valp, int write);
347 extern int tdep_trace (unw_cursor_t *cursor, void **addresses, int *n);
348 extern void tdep_stash_frame (struct dwarf_cursor *c,
349 struct dwarf_reg_state *rs);
350
351 /* unwinding method selection support */
352 #define UNW_ARM_METHOD_ALL 0xFF
353 #define UNW_ARM_METHOD_DWARF 0x01
354 #define UNW_ARM_METHOD_FRAME 0x02
355 #define UNW_ARM_METHOD_EXIDX 0x04
356 #define UNW_ARM_METHOD_LR 0x08
357
358 #define unwi_unwind_method UNW_OBJ(unwind_method)
359 extern int unwi_unwind_method;
360
361 #define UNW_TRY_METHOD(x) (unwi_unwind_method & x)
362
363 #endif /* ARM_LIBUNWIND_I_H */
364