1 /*-
2 * Copyright (c) 2010 Kai Wang
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include "_libdwarf.h"
28
29 ELFTC_VCSID("$Id: dwarf_pro_reloc.c 2074 2011-10-27 03:34:33Z jkoshy $");
30
31 int
dwarf_get_relocation_info_count(Dwarf_P_Debug dbg,Dwarf_Unsigned * reloc_cnt,int * drd_buffer_version,Dwarf_Error * error)32 dwarf_get_relocation_info_count(Dwarf_P_Debug dbg, Dwarf_Unsigned *reloc_cnt,
33 int *drd_buffer_version, Dwarf_Error *error)
34 {
35
36 if (dbg == NULL || reloc_cnt == NULL || drd_buffer_version == NULL) {
37 DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
38 return (DW_DLV_ERROR);
39 }
40
41 if ((dbg->dbgp_flags & DW_DLC_SYMBOLIC_RELOCATIONS) == 0) {
42 DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
43 return (DW_DLV_NO_ENTRY);
44 }
45
46 *reloc_cnt = dbg->dbgp_drscnt;
47 *drd_buffer_version = DWARF_DRD_BUFFER_VERSION;
48
49 return (DW_DLV_OK);
50 }
51
52 int
dwarf_get_relocation_info(Dwarf_P_Debug dbg,Dwarf_Signed * elf_section_index,Dwarf_Signed * elf_section_link,Dwarf_Unsigned * reloc_entry_count,Dwarf_Relocation_Data * reloc_buffer,Dwarf_Error * error)53 dwarf_get_relocation_info(Dwarf_P_Debug dbg, Dwarf_Signed *elf_section_index,
54 Dwarf_Signed *elf_section_link, Dwarf_Unsigned *reloc_entry_count,
55 Dwarf_Relocation_Data *reloc_buffer, Dwarf_Error *error)
56 {
57 Dwarf_Rel_Section drs;
58 Dwarf_Rel_Entry dre;
59 int i;
60
61 if (dbg == NULL || elf_section_index == NULL ||
62 elf_section_link == NULL || reloc_entry_count == NULL ||
63 reloc_buffer == NULL) {
64 DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
65 return (DW_DLV_ERROR);
66 }
67
68 if ((dbg->dbgp_flags & DW_DLC_SYMBOLIC_RELOCATIONS) == 0) {
69 DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
70 return (DW_DLV_NO_ENTRY);
71 }
72
73 if (dbg->dbgp_drscnt == 0) {
74 DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
75 return (DW_DLV_NO_ENTRY);
76 }
77
78 if (dbg->dbgp_drspos == NULL) {
79 DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
80 return (DW_DLV_NO_ENTRY);
81 }
82
83 drs = dbg->dbgp_drspos;
84 assert(drs->drs_ds != NULL && drs->drs_ref != NULL);
85 assert(drs->drs_drecnt > 0);
86
87 *elf_section_index = drs->drs_ds->ds_ndx;
88 *elf_section_link = drs->drs_ref->ds_ndx;
89 *reloc_entry_count = drs->drs_drecnt;
90
91 if (drs->drs_drd == NULL) {
92 drs->drs_drd = calloc(*reloc_entry_count,
93 sizeof(struct Dwarf_Relocation_Data_s));
94 if (drs->drs_drd == NULL) {
95 DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
96 return (DW_DLV_ERROR);
97 }
98 for (i = 0, dre = STAILQ_FIRST(&drs->drs_dre);
99 (Dwarf_Unsigned) i < *reloc_entry_count && dre != NULL;
100 i++, dre = STAILQ_NEXT(dre, dre_next)) {
101 drs->drs_drd[i].drd_type = dre->dre_type;
102 drs->drs_drd[i].drd_length = dre->dre_length;
103 drs->drs_drd[i].drd_offset = dre->dre_offset;
104 drs->drs_drd[i].drd_symbol_index = dre->dre_symndx;
105 }
106 assert((Dwarf_Unsigned) i == *reloc_entry_count && dre == NULL);
107 }
108
109 *reloc_buffer = drs->drs_drd;
110
111 dbg->dbgp_drspos = STAILQ_NEXT(dbg->dbgp_drspos, drs_next);
112
113 return (DW_DLV_OK);
114 }
115