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04277e02 | 1 | /* Copyright (C) 2005-2019 Free Software Foundation, Inc. |
f10eff58 DJ |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
ab84e3ff PE |
15 | License along with the GNU C Library. If not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
f10eff58 DJ |
17 | |
18 | #include <link.h> | |
19 | #include <unwind.h> | |
20 | ||
21 | struct unw_eh_callback_data | |
22 | { | |
23 | _Unwind_Ptr pc; | |
24 | _Unwind_Ptr exidx_start; | |
25 | int exidx_len; | |
26 | }; | |
27 | ||
28 | ||
29 | /* Callback to determins if the PC lies within an object, and remember the | |
30 | location of the exception index table if it does. */ | |
31 | ||
32 | static int | |
33 | find_exidx_callback (struct dl_phdr_info * info, size_t size, void * ptr) | |
34 | { | |
35 | struct unw_eh_callback_data * data; | |
36 | const ElfW(Phdr) *phdr; | |
37 | int i; | |
38 | int match; | |
39 | _Unwind_Ptr load_base; | |
40 | ||
41 | data = (struct unw_eh_callback_data *) ptr; | |
42 | load_base = info->dlpi_addr; | |
43 | phdr = info->dlpi_phdr; | |
44 | ||
45 | match = 0; | |
46 | for (i = info->dlpi_phnum; i > 0; i--, phdr++) | |
47 | { | |
48 | if (phdr->p_type == PT_LOAD) | |
49 | { | |
50 | _Unwind_Ptr vaddr = phdr->p_vaddr + load_base; | |
51 | if (data->pc >= vaddr && data->pc < vaddr + phdr->p_memsz) | |
52 | match = 1; | |
53 | } | |
54 | else if (phdr->p_type == PT_ARM_EXIDX) | |
55 | { | |
56 | data->exidx_start = (_Unwind_Ptr) (phdr->p_vaddr + load_base); | |
57 | data->exidx_len = phdr->p_memsz; | |
58 | } | |
59 | } | |
60 | ||
61 | return match; | |
62 | } | |
63 | ||
64 | ||
65 | /* Find the exception index table containing PC. */ | |
66 | ||
67 | _Unwind_Ptr | |
68 | __gnu_Unwind_Find_exidx (_Unwind_Ptr pc, int * pcount) | |
69 | { | |
70 | struct unw_eh_callback_data data; | |
71 | ||
72 | data.pc = pc; | |
73 | data.exidx_start = 0; | |
5de92c17 | 74 | if (__dl_iterate_phdr (find_exidx_callback, &data) <= 0) |
f10eff58 DJ |
75 | return 0; |
76 | ||
77 | *pcount = data.exidx_len / 8; | |
78 | return data.exidx_start; | |
79 | } |