1/*	$NetBSD: dwarf_pro_reloc.c,v 1.5 2024/03/03 17:37:32 christos Exp $	*/
2
3/*-
4 * Copyright (c) 2010 Kai Wang
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include "_libdwarf.h"
30
31__RCSID("$NetBSD: dwarf_pro_reloc.c,v 1.5 2024/03/03 17:37:32 christos Exp $");
32ELFTC_VCSID("Id: dwarf_pro_reloc.c 2074 2011-10-27 03:34:33Z jkoshy");
33
34int
35dwarf_get_relocation_info_count(Dwarf_P_Debug dbg, Dwarf_Unsigned *reloc_cnt,
36    int *drd_buffer_version, Dwarf_Error *error)
37{
38
39	if (dbg == NULL || reloc_cnt == NULL || drd_buffer_version == NULL) {
40		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
41		return (DW_DLV_ERROR);
42	}
43
44	if ((dbg->dbgp_flags & DW_DLC_SYMBOLIC_RELOCATIONS) == 0) {
45		DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
46		return (DW_DLV_NO_ENTRY);
47	}
48
49	*reloc_cnt = dbg->dbgp_drscnt;
50	*drd_buffer_version = DWARF_DRD_BUFFER_VERSION;
51
52	return (DW_DLV_OK);
53}
54
55int
56dwarf_get_relocation_info(Dwarf_P_Debug dbg, Dwarf_Signed *elf_section_index,
57    Dwarf_Signed *elf_section_link, Dwarf_Unsigned *reloc_entry_count,
58    Dwarf_Relocation_Data *reloc_buffer, Dwarf_Error *error)
59{
60	Dwarf_Rel_Section drs;
61	Dwarf_Rel_Entry dre;
62	int i;
63
64	if (dbg == NULL || elf_section_index == NULL ||
65	    elf_section_link == NULL || reloc_entry_count == NULL ||
66	    reloc_buffer == NULL) {
67		DWARF_SET_ERROR(dbg, error, DW_DLE_ARGUMENT);
68		return (DW_DLV_ERROR);
69	}
70
71	if ((dbg->dbgp_flags & DW_DLC_SYMBOLIC_RELOCATIONS) == 0) {
72		DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
73		return (DW_DLV_NO_ENTRY);
74	}
75
76	if (dbg->dbgp_drscnt == 0) {
77		DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
78		return (DW_DLV_NO_ENTRY);
79	}
80
81	if (dbg->dbgp_drspos == NULL) {
82		DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
83		return (DW_DLV_NO_ENTRY);
84	}
85
86	drs = dbg->dbgp_drspos;
87	assert(drs->drs_ds != NULL && drs->drs_ref != NULL);
88	assert(drs->drs_drecnt > 0);
89
90	*elf_section_index = drs->drs_ds->ds_ndx;
91	*elf_section_link = drs->drs_ref->ds_ndx;
92	*reloc_entry_count = drs->drs_drecnt;
93
94	if (drs->drs_drd == NULL) {
95		drs->drs_drd = calloc(*reloc_entry_count,
96		    sizeof(struct Dwarf_Relocation_Data_s));
97		if (drs->drs_drd == NULL) {
98			DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
99			return (DW_DLV_ERROR);
100		}
101		for (i = 0, dre = STAILQ_FIRST(&drs->drs_dre);
102		    (Dwarf_Unsigned) i < *reloc_entry_count && dre != NULL;
103		    i++, dre = STAILQ_NEXT(dre, dre_next)) {
104			drs->drs_drd[i].drd_type = dre->dre_type;
105			drs->drs_drd[i].drd_length = dre->dre_length;
106			drs->drs_drd[i].drd_offset = dre->dre_offset;
107			drs->drs_drd[i].drd_symbol_index = dre->dre_symndx;
108		}
109		assert((Dwarf_Unsigned) i == *reloc_entry_count && dre == NULL);
110	}
111
112	*reloc_buffer = drs->drs_drd;
113
114	dbg->dbgp_drspos = STAILQ_NEXT(dbg->dbgp_drspos, drs_next);
115
116	return (DW_DLV_OK);
117}
118