1 /* libunwind - a platform-independent unwind library
2 Copyright (C) 2001-2005 Hewlett-Packard Co
3 Copyright (C) 2007 David Mosberger-Tang
4 Contributed by David Mosberger-Tang <dmosberger@gmail.com>
6 This file is part of libunwind.
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:
16 The above copyright notice and this permission notice shall be
17 included in all copies or substantial portions of the Software.
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. */
27 /* This files contains libunwind-internal definitions which are
28 subject to frequent change and are not to be exposed to
40 #if defined(HAVE___THREAD) && HAVE___THREAD
41 #define UNWI_DEFAULT_CACHING_POLICY UNW_CACHE_PER_THREAD
43 #define UNWI_DEFAULT_CACHING_POLICY UNW_CACHE_GLOBAL
46 /* Platform-independent libunwind-internal declarations. */
48 #include <sys/types.h> /* HP-UX needs this before include of pthread.h */
51 #include <libunwind.h>
59 #if defined(HAVE_ELF_H)
61 #elif defined(HAVE_SYS_ELF_H)
64 # error Could not locate <elf.h>
67 #if defined(HAVE_ENDIAN_H)
69 #elif defined(HAVE_SYS_ENDIAN_H)
70 # include <sys/endian.h>
71 # if defined(_LITTLE_ENDIAN) && !defined(__LITTLE_ENDIAN)
72 # define __LITTLE_ENDIAN _LITTLE_ENDIAN
74 # if defined(_BIG_ENDIAN) && !defined(__BIG_ENDIAN)
75 # define __BIG_ENDIAN _BIG_ENDIAN
77 # if defined(_BYTE_ORDER) && !defined(__BYTE_ORDER)
78 # define __BYTE_ORDER _BYTE_ORDER
81 # define __LITTLE_ENDIAN 1234
82 # define __BIG_ENDIAN 4321
84 # define __BYTE_ORDER __BIG_ENDIAN
85 # elif defined(__QNX__)
86 # if defined(__BIGENDIAN__)
87 # define __BYTE_ORDER __BIG_ENDIAN
88 # elif defined(__LITTLEENDIAN__)
89 # define __BYTE_ORDER __LITTLE_ENDIAN
91 # error Host has unknown byte-order.
94 # error Host has unknown byte-order.
98 #if defined(HAVE__BUILTIN_UNREACHABLE)
99 # define unreachable() __builtin_unreachable()
101 # define unreachable() do { } while (1)
110 /* Make it easy to write thread-safe code which may or may not be
111 linked against libpthread. The macros below can be used
112 unconditionally and if -lpthread is around, they'll call the
113 corresponding routines otherwise, they do nothing. */
115 #pragma weak pthread_mutex_init
116 #pragma weak pthread_mutex_lock
117 #pragma weak pthread_mutex_unlock
119 #define mutex_init(l) \
120 (pthread_mutex_init != NULL ? pthread_mutex_init ((l), NULL) : 0)
121 #define mutex_lock(l) \
122 (pthread_mutex_lock != NULL ? pthread_mutex_lock (l) : 0)
123 #define mutex_unlock(l) \
124 (pthread_mutex_unlock != NULL ? pthread_mutex_unlock (l) : 0)
126 #ifdef HAVE_ATOMIC_OPS_H
127 # include <atomic_ops.h>
129 cmpxchg_ptr (void *addr, void *old, void *new)
139 return AO_compare_and_swap(u.aop, (AO_t) old, (AO_t) new);
141 # define fetch_and_add1(_ptr) AO_fetch_and_add1(_ptr)
142 # define fetch_and_add(_ptr, value) AO_fetch_and_add(_ptr, value)
143 /* GCC 3.2.0 on HP-UX crashes on cmpxchg_ptr() */
144 # if !(defined(__hpux) && __GNUC__ == 3 && __GNUC_MINOR__ == 2)
145 # define HAVE_CMPXCHG
147 # define HAVE_FETCH_AND_ADD
148 #elif defined(HAVE_SYNC_ATOMICS) || defined(HAVE_IA64INTRIN_H)
149 # ifdef HAVE_IA64INTRIN_H
150 # include <ia64intrin.h>
153 cmpxchg_ptr (void *addr, void *old, void *new)
163 return __sync_bool_compare_and_swap(u.vlp, (long) old, (long) new);
165 # define fetch_and_add1(_ptr) __sync_fetch_and_add(_ptr, 1)
166 # define fetch_and_add(_ptr, value) __sync_fetch_and_add(_ptr, value)
167 # define HAVE_CMPXCHG
168 # define HAVE_FETCH_AND_ADD
170 #define atomic_read(ptr) (*(ptr))
172 #define UNWI_OBJ(fn) UNW_PASTE(UNW_PREFIX,UNW_PASTE(I,fn))
173 #define UNWI_ARCH_OBJ(fn) UNW_PASTE(UNW_PASTE(UNW_PASTE(_UI,UNW_TARGET),_), fn)
175 #define unwi_full_mask UNWI_ARCH_OBJ(full_mask)
177 /* Type of a mask that can be used to inhibit preemption. At the
178 userlevel, preemption is caused by signals and hence sigset_t is
179 appropriate. In constrast, the Linux kernel uses "unsigned long"
180 to hold the processor "flags" instead. */
181 typedef sigset_t intrmask_t;
183 extern intrmask_t unwi_full_mask;
185 /* Silence compiler warnings about variables which are used only if libunwind
186 is configured in a certain way */
187 static inline void mark_as_used(void *v UNUSED) {
190 #if defined(CONFIG_BLOCK_SIGNALS)
191 # define SIGPROCMASK(how, new_mask, old_mask) \
192 sigprocmask((how), (new_mask), (old_mask))
194 # define SIGPROCMASK(how, new_mask, old_mask) mark_as_used(old_mask)
197 /* Prefer adaptive mutexes if available */
198 #ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
199 #define UNW_PTHREAD_MUTEX_INITIALIZER PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
201 #define UNW_PTHREAD_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
204 #define define_lock(name) \
205 pthread_mutex_t name = UNW_PTHREAD_MUTEX_INITIALIZER
206 #define lock_init(l) mutex_init (l)
207 #define lock_acquire(l,m) \
209 SIGPROCMASK (SIG_SETMASK, &unwi_full_mask, &(m)); \
212 #define lock_release(l,m) \
215 SIGPROCMASK (SIG_SETMASK, &(m), NULL); \
218 #define SOS_MEMORY_SIZE 16384 /* see src/mi/mempool.c */
220 #ifndef MAP_ANONYMOUS
221 # define MAP_ANONYMOUS MAP_ANON
223 #define GET_MEMORY(mem, size) \
225 /* Hopefully, mmap() goes straight through to a system call stub... */ \
226 mem = mmap (NULL, size, PROT_READ | PROT_WRITE, \
227 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); \
228 if (mem == MAP_FAILED) \
232 #define unwi_find_dynamic_proc_info UNWI_OBJ(find_dynamic_proc_info)
233 #define unwi_extract_dynamic_proc_info UNWI_OBJ(extract_dynamic_proc_info)
234 #define unwi_put_dynamic_unwind_info UNWI_OBJ(put_dynamic_unwind_info)
235 #define unwi_dyn_remote_find_proc_info UNWI_OBJ(dyn_remote_find_proc_info)
236 #define unwi_dyn_remote_put_unwind_info UNWI_OBJ(dyn_remote_put_unwind_info)
237 #define unwi_dyn_validate_cache UNWI_OBJ(dyn_validate_cache)
239 extern int unwi_find_dynamic_proc_info (unw_addr_space_t as,
242 int need_unwind_info, void *arg);
243 extern int unwi_extract_dynamic_proc_info (unw_addr_space_t as,
247 int need_unwind_info,
249 extern void unwi_put_dynamic_unwind_info (unw_addr_space_t as,
250 unw_proc_info_t *pi, void *arg);
252 /* These handle the remote (cross-address-space) case of accessing
253 dynamic unwind info. */
255 extern int unwi_dyn_remote_find_proc_info (unw_addr_space_t as,
258 int need_unwind_info,
260 extern void unwi_dyn_remote_put_unwind_info (unw_addr_space_t as,
263 extern int unwi_dyn_validate_cache (unw_addr_space_t as, void *arg);
265 extern unw_dyn_info_list_t _U_dyn_info_list;
266 extern pthread_mutex_t _U_dyn_info_list_lock;
269 #define unwi_debug_level UNWI_ARCH_OBJ(debug_level)
270 extern long unwi_debug_level;
273 # define Debug(level,format...) \
275 if (unwi_debug_level >= level) \
280 fprintf (stderr, "%*c>%s: ", _n, ' ', __FUNCTION__); \
281 fprintf (stderr, format); \
284 # define Dprintf(format...) fprintf (stderr, format)
286 # define Debug(level,format...)
287 # define Dprintf(format...)
290 static ALWAYS_INLINE int
291 print_error (const char *string)
293 return write (2, string, strlen (string));
296 #define mi_init UNWI_ARCH_OBJ(mi_init)
298 extern void mi_init (void); /* machine-independent initializations */
299 extern unw_word_t _U_dyn_info_list_addr (void);
301 /* This is needed/used by ELF targets only. */
305 void *image; /* pointer to mmap'd image */
306 size_t size; /* (file-) size of the image */
312 unw_dyn_info_t di_cache;
313 unw_dyn_info_t di_debug; /* additional table info for .debug_frame */
318 unw_dyn_info_t di_arm; /* additional table info for .ARM.exidx */
322 static inline void invalidate_edi (struct elf_dyn_info *edi)
325 munmap (edi->ei.image, edi->ei.size);
326 memset (edi, 0, sizeof (*edi));
327 edi->di_cache.format = -1;
328 edi->di_debug.format = -1;
330 edi->di_arm.format = -1;
335 /* Provide a place holder for architecture to override for fast access
336 to memory when known not to need to validate and know the access
337 will be local to the process. A suitable override will improve
338 unw_tdep_trace() performance in particular. */
339 #define ACCESS_MEM_FAST(ret,validate,cur,addr,to) \
340 do { (ret) = dwarf_get ((cur), DWARF_MEM_LOC ((cur), (addr)), &(to)); } \
343 /* Define GNU and processor specific values for the Phdr p_type field in case
344 they aren't defined by <elf.h>. */
345 #ifndef PT_GNU_EH_FRAME
346 # define PT_GNU_EH_FRAME 0x6474e550
347 #endif /* !PT_GNU_EH_FRAME */
349 # define PT_ARM_EXIDX 0x70000001 /* ARM unwind segment */
350 #endif /* !PT_ARM_EXIDX */
352 #include "tdep/libunwind_i.h"
354 #ifndef tdep_get_func_addr
355 # define tdep_get_func_addr(as,addr,v) (*(v) = addr, 0)
358 #ifndef DWARF_VAL_LOC
359 # define DWARF_IS_VAL_LOC(l) 0
360 # define DWARF_VAL_LOC(c,v) DWARF_NULL_LOC
363 #define UNW_ALIGN(x,a) (((x)+(a)-1UL)&~((a)-1UL))
365 #endif /* libunwind_i_h */