1 /* libunwind - a platform-independent unwind library
2
3 This file is part of libunwind.
4
5 Permission is hereby granted, free of charge, to any person obtaining
6 a copy of this software and associated documentation files (the
7 "Software"), to deal in the Software without restriction, including
8 without limitation the rights to use, copy, modify, merge, publish,
9 distribute, sublicense, and/or sell copies of the Software, and to
10 permit persons to whom the Software is furnished to do so, subject to
11 the following conditions:
12
13 The above copyright notice and this permission notice shall be
14 included in all copies or substantial portions of the Software.
15
16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
23
24 #if defined(HAVE_ELF_H)
25 # include <elf.h>
26 #elif defined(HAVE_SYS_ELF_H)
27 # include <sys/elf.h>
28 #endif
29
30 #include "_UCD_lib.h"
31 #include "_UCD_internal.h"
32
33 static int
get_unwind_info(struct UCD_info * ui,unw_addr_space_t as,unw_word_t ip)34 get_unwind_info(struct UCD_info *ui, unw_addr_space_t as, unw_word_t ip)
35 {
36 unsigned long segbase, mapoff;
37
38 #if UNW_TARGET_IA64 && defined(__linux__)
39 if (!ui->edi.ktab.start_ip && _Uia64_get_kernel_table (&ui->edi.ktab) < 0)
40 return -UNW_ENOINFO;
41
42 if (ui->edi.ktab.format != -1 && ip >= ui->edi.ktab.start_ip && ip < ui->edi.ktab.end_ip)
43 return 0;
44 #endif
45
46 if ((ui->edi.di_cache.format != -1
47 && ip >= ui->edi.di_cache.start_ip && ip < ui->edi.di_cache.end_ip)
48 #if UNW_TARGET_ARM
49 || (ui->edi.di_debug.format != -1
50 && ip >= ui->edi.di_arm.start_ip && ip < ui->edi.di_arm.end_ip)
51 #endif
52 || (ui->edi.di_debug.format != -1
53 && ip >= ui->edi.di_debug.start_ip && ip < ui->edi.di_debug.end_ip))
54 return 0;
55
56 invalidate_edi (&ui->edi);
57
58 /* Used to be tdep_get_elf_image() in ptrace unwinding code */
59 coredump_phdr_t *phdr = _UCD_get_elf_image(ui, ip);
60 if (!phdr)
61 {
62 Debug(1, "returns error: _UCD_get_elf_image failed\n");
63 return -UNW_ENOINFO;
64 }
65 /* segbase: where it is mapped in virtual memory */
66 /* mapoff: offset in the file */
67 segbase = phdr->p_vaddr;
68 /*mapoff = phdr->p_offset; WRONG! phdr->p_offset is the offset in COREDUMP file */
69 mapoff = 0;
70 ///FIXME. text segment is USUALLY, not always, at offset 0 in the binary/.so file.
71 // ensure that at initialization.
72
73 /* Here, SEGBASE is the starting-address of the (mmap'ped) segment
74 which covers the IP we're looking for. */
75 if (tdep_find_unwind_table(&ui->edi, as, phdr->backing_filename, segbase, mapoff, ip) < 0)
76 {
77 Debug(1, "returns error: tdep_find_unwind_table failed\n");
78 return -UNW_ENOINFO;
79 }
80
81 /* This can happen in corner cases where dynamically generated
82 code falls into the same page that contains the data-segment
83 and the page-offset of the code is within the first page of
84 the executable. */
85 if (ui->edi.di_cache.format != -1
86 && (ip < ui->edi.di_cache.start_ip || ip >= ui->edi.di_cache.end_ip))
87 ui->edi.di_cache.format = -1;
88
89 if (ui->edi.di_debug.format != -1
90 && (ip < ui->edi.di_debug.start_ip || ip >= ui->edi.di_debug.end_ip))
91 ui->edi.di_debug.format = -1;
92
93 if (ui->edi.di_cache.format == -1
94 #if UNW_TARGET_ARM
95 && ui->edi.di_arm.format == -1
96 #endif
97 && ui->edi.di_debug.format == -1)
98 {
99 Debug(1, "returns error: all formats are -1\n");
100 return -UNW_ENOINFO;
101 }
102
103 Debug(1, "returns success\n");
104 return 0;
105 }
106
107 int
_UCD_find_proc_info(unw_addr_space_t as,unw_word_t ip,unw_proc_info_t * pi,int need_unwind_info,void * arg)108 _UCD_find_proc_info (unw_addr_space_t as, unw_word_t ip, unw_proc_info_t *pi,
109 int need_unwind_info, void *arg)
110 {
111 struct UCD_info *ui = arg;
112
113 Debug(1, "entering\n");
114
115 int ret = -UNW_ENOINFO;
116
117 if (get_unwind_info(ui, as, ip) < 0) {
118 Debug(1, "returns error: get_unwind_info failed\n");
119 return -UNW_ENOINFO;
120 }
121
122 #if UNW_TARGET_IA64
123 if (ui->edi.ktab.format != -1)
124 {
125 /* The kernel unwind table resides in local memory, so we have
126 to use the local address space to search it. Since
127 _UCD_put_unwind_info() has no easy way of detecting this
128 case, we simply make a copy of the unwind-info, so
129 _UCD_put_unwind_info() can always free() the unwind-info
130 without ill effects. */
131 ret = tdep_search_unwind_table (unw_local_addr_space, ip, &ui->edi.ktab, pi,
132 need_unwind_info, arg);
133 if (ret >= 0)
134 {
135 if (!need_unwind_info)
136 pi->unwind_info = NULL;
137 else
138 {
139 void *mem = malloc (pi->unwind_info_size);
140
141 if (!mem)
142 return -UNW_ENOMEM;
143 memcpy (mem, pi->unwind_info, pi->unwind_info_size);
144 pi->unwind_info = mem;
145 }
146 }
147 }
148 #endif
149
150 if (ret == -UNW_ENOINFO && ui->edi.di_cache.format != -1)
151 ret = tdep_search_unwind_table (as, ip, &ui->edi.di_cache,
152 pi, need_unwind_info, arg);
153
154 #if UNW_TARGET_ARM
155 if (ret == -UNW_ENOINFO && ui->edi.di_arm.format != -1)
156 ret = tdep_search_unwind_table (as, ip, &ui->edi.di_arm, pi,
157 need_unwind_info, arg);
158 #endif
159
160 if (ret == -UNW_ENOINFO && ui->edi.di_debug.format != -1)
161 ret = tdep_search_unwind_table (as, ip, &ui->edi.di_debug, pi,
162 need_unwind_info, arg);
163
164 Debug(1, "returns %d\n", ret);
165
166 return ret;
167 }
168