1/*
2
3  Copyright (C) 2000,2004 Silicon Graphics, Inc.  All Rights Reserved.
4  Portions Copyright 2008-2010 David Anderson, Inc. All rights reserved.
5
6  This program is free software; you can redistribute it and/or modify it
7  under the terms of version 2.1 of the GNU Lesser General Public License
8  as published by the Free Software Foundation.
9
10  This program is distributed in the hope that it would be useful, but
11  WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
13
14  Further, this software is distributed without any warranty that it is
15  free of the rightful claim of any third person regarding infringement
16  or the like.  Any license provided herein, whether implied or
17  otherwise, applies only to this software file.  Patent licenses, if
18  any, provided herein do not apply to combinations of this program with
19  other software, or any other product whatsoever.
20
21  You should have received a copy of the GNU Lesser General Public
22  License along with this program; if not, write the Free Software
23  Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston MA 02110-1301,
24  USA.
25
26  Contact information:  Silicon Graphics, Inc., 1500 Crittenden Lane,
27  Mountain View, CA 94043, or:
28
29  http://www.sgi.com
30
31  For further information regarding this notice, see:
32
33  http://oss.sgi.com/projects/GenInfo/NoticeExplan
34
35*/
36
37
38
39#include "config.h"
40#include "libdwarfdefs.h"
41#include <stdio.h>
42#include <string.h>
43/*#include <elfaccess.h> */
44#include "pro_incl.h"
45
46
47/*Do initial alloc of newslots slots.
48  Fails only if malloc fails.
49
50  Supposed to be called before any relocs allocated.
51  Ignored if after any allocated.
52
53  Part of an optimization, so that for a known 'newslots'
54  relocations count we can preallocate the right size block.
55  Called from just 2 places.
56
57  returns DW_DLV_OK or  DW_DLV_ERROR
58*/
59int
60_dwarf_pro_pre_alloc_n_reloc_slots(Dwarf_P_Debug dbg,
61    int rel_sec_index,
62    Dwarf_Unsigned newslots)
63{
64    unsigned long len = 0;
65    struct Dwarf_P_Relocation_Block_s *data = 0;
66    Dwarf_P_Per_Reloc_Sect prel = &dbg->de_reloc_sect[rel_sec_index];
67    unsigned long slots_in_blk = (unsigned long) newslots;
68    unsigned long rel_rec_size = dbg->de_relocation_record_size;
69
70    if (prel->pr_first_block)
71        return DW_DLV_OK;       /* do nothing */
72
73    len = sizeof(struct Dwarf_P_Relocation_Block_s) +
74        slots_in_blk * rel_rec_size;
75
76
77    data = (struct Dwarf_P_Relocation_Block_s *)
78        _dwarf_p_get_alloc(dbg, len);
79    if (!data) {
80        return DW_DLV_ERROR;
81    }
82    data->rb_slots_in_block = slots_in_blk;     /* could use default
83                                                   here, as fallback in
84                                                   case our origininal
85                                                   estimate wrong. When
86                                                   we call this we
87                                                   presumably know what
88                                                   we are doing, so
89                                                   keep this count for
90                                                   now */
91    data->rb_next_slot_to_use = 0;
92    data->rb_where_to_add_next =
93        ((char *) data) + sizeof(struct Dwarf_P_Relocation_Block_s);
94    data->rb_data = data->rb_where_to_add_next;
95
96    prel->pr_first_block = data;
97    prel->pr_last_block = data;
98    prel->pr_block_count = 1;
99
100
101    return DW_DLV_OK;
102}
103
104
105/*Do alloc of slots.
106  Fails only if malloc fails.
107
108  Only allocator used.
109
110  returns DW_DLV_OK or  DW_DLV_ERROR
111*/
112int
113_dwarf_pro_alloc_reloc_slots(Dwarf_P_Debug dbg, int rel_sec_index)
114{
115    unsigned long len = 0;
116    struct Dwarf_P_Relocation_Block_s *data = 0;
117    Dwarf_P_Per_Reloc_Sect prel = &dbg->de_reloc_sect[rel_sec_index];
118    unsigned long slots_in_blk = prel->pr_slots_per_block_to_alloc;
119    unsigned long rel_rec_size = dbg->de_relocation_record_size;
120
121    len = sizeof(struct Dwarf_P_Relocation_Block_s) +
122        slots_in_blk * rel_rec_size;
123
124    data = (struct Dwarf_P_Relocation_Block_s *)
125        _dwarf_p_get_alloc(dbg, len);
126    if (!data) {
127        return DW_DLV_ERROR;
128    }
129
130    if (prel->pr_first_block) {
131        prel->pr_last_block->rb_next = data;
132        prel->pr_last_block = data;
133        prel->pr_block_count += 1;
134
135    } else {
136
137        prel->pr_first_block = data;
138        prel->pr_last_block = data;
139        prel->pr_block_count = 1;
140    }
141
142    data->rb_slots_in_block = slots_in_blk;
143    data->rb_next_slot_to_use = 0;
144    data->rb_where_to_add_next =
145        ((char *) data) + sizeof(struct Dwarf_P_Relocation_Block_s);
146    data->rb_data = data->rb_where_to_add_next;
147
148    return DW_DLV_OK;
149
150}
151
152/*
153        Reserve a slot. return DW_DLV_OK if succeeds.
154
155        Return DW_DLV_ERROR if fails (malloc error).
156
157        Use the relrec_to_fill to pass back a pointer to
158        a slot space to use.
159*/
160int
161_dwarf_pro_reloc_get_a_slot(Dwarf_P_Debug dbg,
162    int base_sec_index, void **relrec_to_fill)
163{
164    struct Dwarf_P_Relocation_Block_s *data = 0;
165    Dwarf_P_Per_Reloc_Sect prel = &dbg->de_reloc_sect[base_sec_index];
166    unsigned long rel_rec_size = dbg->de_relocation_record_size;
167
168    char *ret_addr = 0;
169
170    data = prel->pr_last_block;
171    if ((data == 0) ||
172        (data->rb_next_slot_to_use >= data->rb_slots_in_block)) {
173        int res;
174
175        res = _dwarf_pro_alloc_reloc_slots(dbg, base_sec_index);
176        if (res != DW_DLV_OK) {
177            return res;
178        }
179    }
180
181    data = prel->pr_last_block;
182    /* now we have an empty slot */
183    ret_addr = data->rb_where_to_add_next;
184
185    data->rb_where_to_add_next += rel_rec_size;
186    data->rb_next_slot_to_use += 1;
187
188    prel->pr_reloc_total_count += 1;
189
190    *relrec_to_fill = (void *) ret_addr;
191
192    return DW_DLV_OK;
193
194}
195
196/*
197   On success  returns count of
198   .rel.* sections that are symbolic
199   thru count_of_relocation_sections.
200
201   On success, returns DW_DLV_OK.
202
203   If this is not a 'symbolic' run, returns
204    DW_DLV_NO_ENTRY.
205
206   No errors are possible.
207
208
209
210
211*/
212
213 /*ARGSUSED*/ int
214dwarf_get_relocation_info_count(Dwarf_P_Debug dbg,
215    Dwarf_Unsigned *
216    count_of_relocation_sections,
217    int *drd_buffer_version,
218    Dwarf_Error * error)
219{
220    if (dbg->de_flags & DW_DLC_SYMBOLIC_RELOCATIONS) {
221        int i;
222        unsigned int count = 0;
223
224        for (i = 0; i < NUM_DEBUG_SECTIONS; ++i) {
225            if (dbg->de_reloc_sect[i].pr_reloc_total_count > 0) {
226                ++count;
227            }
228        }
229        *count_of_relocation_sections = (Dwarf_Unsigned) count;
230        *drd_buffer_version = DWARF_DRD_BUFFER_VERSION;
231        return DW_DLV_OK;
232    }
233    return DW_DLV_NO_ENTRY;
234}
235
236int
237dwarf_get_relocation_info(Dwarf_P_Debug dbg,
238    Dwarf_Signed * elf_section_index,
239    Dwarf_Signed * elf_section_index_link,
240    Dwarf_Unsigned * relocation_buffer_count,
241    Dwarf_Relocation_Data * reldata_buffer,
242    Dwarf_Error * error)
243{
244    int next = dbg->de_reloc_next_to_return;
245
246    if (dbg->de_flags & DW_DLC_SYMBOLIC_RELOCATIONS) {
247        int i;
248
249        for (i = next; i < NUM_DEBUG_SECTIONS; ++i) {
250            Dwarf_P_Per_Reloc_Sect prel = &dbg->de_reloc_sect[i];
251
252            if (prel->pr_reloc_total_count > 0) {
253                dbg->de_reloc_next_to_return = i + 1;
254
255
256                /* ASSERT: prel->.pr_block_count == 1 */
257
258                *elf_section_index = prel->pr_sect_num_of_reloc_sect;
259                *elf_section_index_link = dbg->de_elf_sects[i];
260                *relocation_buffer_count = prel->pr_reloc_total_count;
261                *reldata_buffer = (Dwarf_Relocation_Data)
262                    (prel->pr_first_block->rb_data);
263                return DW_DLV_OK;
264            }
265        }
266        DWARF_P_DBG_ERROR(dbg, DW_DLE_REL_ALLOC, DW_DLV_ERROR);
267    }
268    return DW_DLV_NO_ENTRY;
269}
270