1 /* libunwind - a platform-independent unwind library
2 Copyright (C) 2003-2004 Hewlett-Packard Co
3 Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
4
5 This file is part of libunwind.
6
7 Permission is hereby granted, free of charge, to any person obtaining
8 a copy of this software and associated documentation files (the
9 "Software"), to deal in the Software without restriction, including
10 without limitation the rights to use, copy, modify, merge, publish,
11 distribute, sublicense, and/or sell copies of the Software, and to
12 permit persons to whom the Software is furnished to do so, subject to
13 the following conditions:
14
15 The above copyright notice and this permission notice shall be
16 included in all copies or substantial portions of the Software.
17
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
25
26 #include <elf.h>
27 #include <fcntl.h>
28 #include <string.h>
29 #include <unistd.h>
30
31 #include <sys/mman.h>
32
33 #include "_UPT_internal.h"
34
35 static int
get_unwind_info(struct elf_dyn_info * edi,pid_t pid,unw_addr_space_t as,unw_word_t ip,void * as_arg)36 get_unwind_info (struct elf_dyn_info *edi, pid_t pid, unw_addr_space_t as, unw_word_t ip, void *as_arg)
37 {
38 /* ANDROID support update. */
39 unsigned long segbase, mapoff;
40 struct elf_image ei;
41 int ret;
42 char *path = NULL;
43 /* End of ANDROID update. */
44
45 #if UNW_TARGET_IA64 && defined(__linux)
46 if (!edi->ktab.start_ip && _Uia64_get_kernel_table (&edi->ktab) < 0)
47 return -UNW_ENOINFO;
48
49 if (edi->ktab.format != -1 && ip >= edi->ktab.start_ip && ip < edi->ktab.end_ip)
50 return 0;
51 #endif
52
53 if ((edi->di_cache.format != -1
54 && ip >= edi->di_cache.start_ip && ip < edi->di_cache.end_ip)
55 #if UNW_TARGET_ARM
56 || (edi->di_debug.format != -1
57 && ip >= edi->di_arm.start_ip && ip < edi->di_arm.end_ip)
58 #endif
59 || (edi->di_debug.format != -1
60 && ip >= edi->di_debug.start_ip && ip < edi->di_debug.end_ip))
61 return 0;
62
63 invalidate_edi(edi);
64
65 /* ANDROID support update. */
66 if (tdep_get_elf_image (as, &ei, pid, ip, &segbase, &mapoff, &path, as_arg) < 0)
67 return -UNW_ENOINFO;
68
69 ret = tdep_find_unwind_table (edi, &ei, as, path, segbase, mapoff, ip);
70 free(path);
71 if (ret < 0)
72 return ret;
73 /* End of ANDROID update. */
74
75 /* This can happen in corner cases where dynamically generated
76 code falls into the same page that contains the data-segment
77 and the page-offset of the code is within the first page of
78 the executable. */
79 if (edi->di_cache.format != -1
80 && (ip < edi->di_cache.start_ip || ip >= edi->di_cache.end_ip))
81 edi->di_cache.format = -1;
82
83 if (edi->di_debug.format != -1
84 && (ip < edi->di_debug.start_ip || ip >= edi->di_debug.end_ip))
85 edi->di_debug.format = -1;
86
87 if (edi->di_cache.format == -1
88 #if UNW_TARGET_ARM
89 && edi->di_arm.format == -1
90 #endif
91 && edi->di_debug.format == -1)
92 return -UNW_ENOINFO;
93
94 return 0;
95 }
96
97 int
_UPT_find_proc_info(unw_addr_space_t as,unw_word_t ip,unw_proc_info_t * pi,int need_unwind_info,void * arg)98 _UPT_find_proc_info (unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pi,
99 int need_unwind_info, void *arg)
100 {
101 struct UPT_info *ui = arg;
102 int ret = -UNW_ENOINFO;
103
104 if (get_unwind_info (&ui->edi, ui->pid, as, ip, arg) < 0)
105 return -UNW_ENOINFO;
106
107 #if UNW_TARGET_IA64
108 if (ui->edi.ktab.format != -1)
109 {
110 /* The kernel unwind table resides in local memory, so we have
111 to use the local address space to search it. Since
112 _UPT_put_unwind_info() has no easy way of detecting this
113 case, we simply make a copy of the unwind-info, so
114 _UPT_put_unwind_info() can always free() the unwind-info
115 without ill effects. */
116 ret = tdep_search_unwind_table (unw_local_addr_space, ip, &ui->edi.ktab, pi,
117 need_unwind_info, arg);
118 if (ret >= 0)
119 {
120 if (!need_unwind_info)
121 pi->unwind_info = NULL;
122 else
123 {
124 void *mem = malloc (pi->unwind_info_size);
125
126 if (!mem)
127 return -UNW_ENOMEM;
128 memcpy (mem, pi->unwind_info, pi->unwind_info_size);
129 pi->unwind_info = mem;
130 }
131 }
132 }
133 #endif
134
135 if (ret == -UNW_ENOINFO && ui->edi.di_cache.format != -1)
136 ret = tdep_search_unwind_table (as, ip, &ui->edi.di_cache,
137 pi, need_unwind_info, arg);
138
139 #if UNW_TARGET_ARM
140 if (ret == -UNW_ENOINFO && ui->edi.di_arm.format != -1)
141 ret = tdep_search_unwind_table (as, ip, &ui->edi.di_arm, pi,
142 need_unwind_info, arg);
143 #endif
144
145 if (ret == -UNW_ENOINFO && ui->edi.di_debug.format != -1)
146 ret = tdep_search_unwind_table (as, ip, &ui->edi.di_debug, pi,
147 need_unwind_info, arg);
148
149 return ret;
150 }
151