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[FreeBSD/FreeBSD.git] / contrib / elftoolchain / libdwarf / dwarf_pro_reloc.c
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
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
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 }