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
41 /* For now, turn off per-thread caching. It uses up too much TLS
42 memory per thread even when the thread never uses libunwind at
47 /* Platform-independent libunwind-internal declarations. */
49 #include <sys/types.h> /* HP-UX needs this before include of pthread.h */
52 #include <libunwind.h>
61 #if defined(HAVE_ENDIAN_H)
63 #elif defined(HAVE_SYS_ENDIAN_H)
64 # include <sys/endian.h>
66 # define __LITTLE_ENDIAN 1234
67 # define __BIG_ENDIAN 4321
69 # define __BYTE_ORDER __BIG_ENDIAN
71 # error Host has unknown byte-order.
81 /* Make it easy to write thread-safe code which may or may not be
82 linked against libpthread. The macros below can be used
83 unconditionally and if -lpthread is around, they'll call the
84 corresponding routines otherwise, they do nothing. */
86 #pragma weak pthread_mutex_init
87 #pragma weak pthread_mutex_lock
88 #pragma weak pthread_mutex_unlock
90 #define mutex_init(l) \
91 (pthread_mutex_init != NULL ? pthread_mutex_init ((l), NULL) : 0)
92 #define mutex_lock(l) \
93 (pthread_mutex_lock != NULL ? pthread_mutex_lock (l) : 0)
94 #define mutex_unlock(l) \
95 (pthread_mutex_unlock != NULL ? pthread_mutex_unlock (l) : 0)
97 #ifdef HAVE_ATOMIC_OPS_H
98 # include <atomic_ops.h>
100 cmpxchg_ptr (void *addr, void *old, void *new)
110 return AO_compare_and_swap(u.aop, (AO_t) old, (AO_t) new);
112 # define fetch_and_add1(_ptr) AO_fetch_and_add1(_ptr)
113 # define fetch_and_add(_ptr, value) AO_fetch_and_add(_ptr, value)
114 /* GCC 3.2.0 on HP-UX crashes on cmpxchg_ptr() */
115 # if !(defined(__hpux) && __GNUC__ == 3 && __GNUC_MINOR__ == 2)
116 # define HAVE_CMPXCHG
118 # define HAVE_FETCH_AND_ADD
119 #elif defined(HAVE_SYNC_ATOMICS) || defined(HAVE_IA64INTRIN_H)
120 # ifdef HAVE_IA64INTRIN_H
121 # include <ia64intrin.h>
124 cmpxchg_ptr (void *addr, void *old, void *new)
134 return __sync_bool_compare_and_swap(u.vlp, (long) old, (long) new);
136 # define fetch_and_add1(_ptr) __sync_fetch_and_add(_ptr, 1)
137 # define fetch_and_add(_ptr, value) __sync_fetch_and_add(_ptr, value)
138 # define HAVE_CMPXCHG
139 # define HAVE_FETCH_AND_ADD
141 #define atomic_read(ptr) (*(ptr))
143 #define UNWI_OBJ(fn) UNW_PASTE(UNW_PREFIX,UNW_PASTE(I,fn))
144 #define UNWI_ARCH_OBJ(fn) UNW_PASTE(UNW_PASTE(UNW_PASTE(_UI,UNW_TARGET),_), fn)
146 #define unwi_full_mask UNWI_ARCH_OBJ(full_mask)
148 /* Type of a mask that can be used to inhibit preemption. At the
149 userlevel, preemption is caused by signals and hence sigset_t is
150 appropriate. In constrast, the Linux kernel uses "unsigned long"
151 to hold the processor "flags" instead. */
152 typedef sigset_t intrmask_t;
154 extern intrmask_t unwi_full_mask;
156 /* Silence compiler warnings about variables which are used only if libunwind
157 is configured in a certain way */
158 static inline void mark_as_used(void *v UNUSED) {
161 #if defined(CONFIG_BLOCK_SIGNALS)
162 # define SIGPROCMASK(how, new_mask, old_mask) \
163 sigprocmask((how), (new_mask), (old_mask))
165 # define SIGPROCMASK(how, new_mask, old_mask) mark_as_used(old_mask)
168 #define define_lock(name) \
169 pthread_mutex_t name = PTHREAD_MUTEX_INITIALIZER
170 #define lock_init(l) mutex_init (l)
171 #define lock_acquire(l,m) \
173 SIGPROCMASK (SIG_SETMASK, &unwi_full_mask, &(m)); \
176 #define lock_release(l,m) \
179 SIGPROCMASK (SIG_SETMASK, &(m), NULL); \
182 #define SOS_MEMORY_SIZE 16384 /* see src/mi/mempool.c */
184 #ifndef MAP_ANONYMOUS
185 # define MAP_ANONYMOUS MAP_ANON
187 #define GET_MEMORY(mem, size) \
189 /* Hopefully, mmap() goes straight through to a system call stub... */ \
190 mem = mmap (NULL, size, PROT_READ | PROT_WRITE, \
191 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); \
192 if (mem == MAP_FAILED) \
196 #define unwi_find_dynamic_proc_info UNWI_OBJ(find_dynamic_proc_info)
197 #define unwi_extract_dynamic_proc_info UNWI_OBJ(extract_dynamic_proc_info)
198 #define unwi_put_dynamic_unwind_info UNWI_OBJ(put_dynamic_unwind_info)
199 #define unwi_dyn_remote_find_proc_info UNWI_OBJ(dyn_remote_find_proc_info)
200 #define unwi_dyn_remote_put_unwind_info UNWI_OBJ(dyn_remote_put_unwind_info)
201 #define unwi_dyn_validate_cache UNWI_OBJ(dyn_validate_cache)
203 extern int unwi_find_dynamic_proc_info (unw_addr_space_t as,
206 int need_unwind_info, void *arg);
207 extern int unwi_extract_dynamic_proc_info (unw_addr_space_t as,
211 int need_unwind_info,
213 extern void unwi_put_dynamic_unwind_info (unw_addr_space_t as,
214 unw_proc_info_t *pi, void *arg);
216 /* These handle the remote (cross-address-space) case of accessing
217 dynamic unwind info. */
219 extern int unwi_dyn_remote_find_proc_info (unw_addr_space_t as,
222 int need_unwind_info,
224 extern void unwi_dyn_remote_put_unwind_info (unw_addr_space_t as,
227 extern int unwi_dyn_validate_cache (unw_addr_space_t as, void *arg);
229 extern unw_dyn_info_list_t _U_dyn_info_list;
230 extern pthread_mutex_t _U_dyn_info_list_lock;
233 #define unwi_debug_level UNWI_ARCH_OBJ(debug_level)
234 extern long unwi_debug_level;
237 # define Debug(level,format...) \
239 if (unwi_debug_level >= level) \
244 fprintf (stderr, "%*c>%s: ", _n, ' ', __FUNCTION__); \
245 fprintf (stderr, format); \
248 # define Dprintf(format...) fprintf (stderr, format)
251 # define inline UNUSED
254 # define Debug(level,format...)
255 # define Dprintf(format...)
258 static ALWAYS_INLINE int
259 print_error (const char *string)
261 return write (2, string, strlen (string));
264 #define mi_init UNWI_ARCH_OBJ(mi_init)
266 extern void mi_init (void); /* machine-independent initializations */
267 extern unw_word_t _U_dyn_info_list_addr (void);
269 /* This is needed/used by ELF targets only. */
273 void *image; /* pointer to mmap'd image */
274 size_t size; /* (file-) size of the image */
280 unw_dyn_info_t di_cache;
281 unw_dyn_info_t di_debug; /* additional table info for .debug_frame */
286 unw_dyn_info_t di_arm; /* additional table info for .ARM.exidx */
290 static inline void invalidate_edi (struct elf_dyn_info *edi)
293 munmap (edi->ei.image, edi->ei.size);
294 memset (edi, 0, sizeof (*edi));
295 edi->di_cache.format = -1;
296 edi->di_debug.format = -1;
298 edi->di_arm.format = -1;
303 /* Provide a place holder for architecture to override for fast access
304 to memory when known not to need to validate and know the access
305 will be local to the process. A suitable override will improve
306 unw_tdep_trace() performance in particular. */
307 #define ACCESS_MEM_FAST(ret,validate,cur,addr,to) \
308 do { (ret) = dwarf_get ((cur), DWARF_MEM_LOC ((cur), (addr)), &(to)); } \
311 /* Define GNU and processor specific values for the Phdr p_type field in case
312 they aren't defined by <elf.h>. */
313 #ifndef PT_GNU_EH_FRAME
314 # define PT_GNU_EH_FRAME 0x6474e550
315 #endif /* !PT_GNU_EH_FRAME */
317 # define PT_ARM_EXIDX 0x70000001 /* ARM unwind segment */
318 #endif /* !PT_ARM_EXIDX */
320 #include "tdep/libunwind_i.h"
322 #ifndef tdep_get_func_addr
323 # define tdep_get_func_addr(as,addr,v) (*(v) = addr, 0)
326 #define UNW_ALIGN(x,a) (((x)+(a)-1UL)&~((a)-1UL))
328 #endif /* libunwind_i_h */