File: pro_reloc.c

package info (click to toggle)
dwarfutils 20180809-1
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 8,228 kB
  • sloc: ansic: 63,382; sh: 5,222; cpp: 4,041; makefile: 548; python: 445; awk: 11
file content (247 lines) | stat: -rw-r--r-- 7,736 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
/*
  Copyright (C) 2000,2004 Silicon Graphics, Inc.  All Rights Reserved.
  Portions Copyright 2008-2016 David Anderson, Inc. All rights reserved.

  This program is free software; you can redistribute it and/or modify it
  under the terms of version 2.1 of the GNU Lesser General Public License
  as published by the Free Software Foundation.

  This program is distributed in the hope that it would be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

  Further, this software is distributed without any warranty that it is
  free of the rightful claim of any third person regarding infringement
  or the like.  Any license provided herein, whether implied or
  otherwise, applies only to this software file.  Patent licenses, if
  any, provided herein do not apply to combinations of this program with
  other software, or any other product whatsoever.

  You should have received a copy of the GNU Lesser General Public
  License along with this program; if not, write the Free Software
  Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston MA 02110-1301,
  USA.

*/

#include "config.h"
#include "libdwarfdefs.h"
#include <stdio.h>
#include <string.h>
/*#include <elfaccess.h> */
#include "pro_incl.h"
#include "pro_reloc.h"


/*  Do initial alloc of newslots slots.
    Fails only if malloc fails.

    Supposed to be called before any relocs allocated.
    Ignored if after any allocated.

    Part of an optimization, so that for a known 'newslots'
    relocations count we can preallocate the right size block.
    Called from just 2 places.

    We use 'slots' so we don't have to do a new
    allocation for every relocation, just a new
    allocation every n slots. slots_in_block.

    returns DW_DLV_OK or  DW_DLV_ERROR
*/
int
_dwarf_pro_pre_alloc_specific_reloc_slots(Dwarf_P_Debug dbg,
    Dwarf_P_Per_Reloc_Sect prel,
    Dwarf_Unsigned newslots)
{
    unsigned long len = 0;
    struct Dwarf_P_Relocation_Block_s *data = 0;
    unsigned long slots_in_blk = (unsigned long) newslots;
    unsigned long rel_rec_size = dbg->de_relocation_record_size;

    if (prel->pr_first_block) {
        return DW_DLV_OK;       /* do nothing */
    }

    len = sizeof(struct Dwarf_P_Relocation_Block_s) +
        slots_in_blk * rel_rec_size;
    data = (struct Dwarf_P_Relocation_Block_s *)
        _dwarf_p_get_alloc(dbg, len);
    if (!data) {
        return DW_DLV_ERROR;
    }
    data->rb_slots_in_block = slots_in_blk;     /* could use default
        here, as fallback in case our origininal
        estimate wrong. When we call this we
        presumably know what we are doing, so
        keep this count for now */
    data->rb_next_slot_to_use = 0;
    data->rb_where_to_add_next =
        ((char *) data) + sizeof(struct Dwarf_P_Relocation_Block_s);
    data->rb_data = data->rb_where_to_add_next;

    prel->pr_first_block = data;
    prel->pr_last_block = data;
    prel->pr_block_count = 1;
    return DW_DLV_OK;
}


/*Do alloc of slots.
  Fails only if malloc fails.

  Only allocator used.

  returns DW_DLV_OK or  DW_DLV_ERROR
*/
int
_dwarf_pro_alloc_reloc_slots(Dwarf_P_Debug dbg, int rel_sec_index)
{
    unsigned long len = 0;
    struct Dwarf_P_Relocation_Block_s *data = 0;
    Dwarf_P_Per_Reloc_Sect prel = &dbg->de_reloc_sect[rel_sec_index];
    unsigned long slots_in_blk = prel->pr_slots_per_block_to_alloc;
    unsigned long rel_rec_size = dbg->de_relocation_record_size;

    len = sizeof(struct Dwarf_P_Relocation_Block_s) +
        slots_in_blk * rel_rec_size;

    data = (struct Dwarf_P_Relocation_Block_s *)
        _dwarf_p_get_alloc(dbg, len);
    if (!data) {
        return DW_DLV_ERROR;
    }

    if (prel->pr_first_block) {
        prel->pr_last_block->rb_next = data;
        prel->pr_last_block = data;
        prel->pr_block_count += 1;
    } else {
        prel->pr_first_block = data;
        prel->pr_last_block = data;
        prel->pr_block_count = 1;
    }
    data->rb_slots_in_block = slots_in_blk;
    data->rb_next_slot_to_use = 0;
    data->rb_where_to_add_next =
        ((char *) data) + sizeof(struct Dwarf_P_Relocation_Block_s);
    data->rb_data = data->rb_where_to_add_next;
    return DW_DLV_OK;

}

/*  Reserve a slot. return DW_DLV_OK if succeeds.

    Return DW_DLV_ERROR if fails (malloc error).

    Use the relrec_to_fill to pass back a pointer to
    a slot space to use.  */
int
_dwarf_pro_reloc_get_a_slot(Dwarf_P_Debug dbg,
    int base_sec_index, void **relrec_to_fill)
{
    struct Dwarf_P_Relocation_Block_s *data = 0;
    Dwarf_P_Per_Reloc_Sect prel = &dbg->de_reloc_sect[base_sec_index];
    unsigned long rel_rec_size = dbg->de_relocation_record_size;

    char *ret_addr = 0;

    data = prel->pr_last_block;
    if ((data == 0) ||
        (data->rb_next_slot_to_use >= data->rb_slots_in_block)) {
        int res;

        res = _dwarf_pro_alloc_reloc_slots(dbg, base_sec_index);
        if (res != DW_DLV_OK) {
            return res;
        }
    }

    data = prel->pr_last_block;
    /* now we have an empty slot */
    ret_addr = data->rb_where_to_add_next;
    data->rb_where_to_add_next += rel_rec_size;
    data->rb_next_slot_to_use += 1;
    prel->pr_reloc_total_count += 1;
    *relrec_to_fill = (void *) ret_addr;
    return DW_DLV_OK;

}

/*
    On success  returns count of
    .rel.* sections that are symbolic
    thru count_of_relocation_sections.

    On success, returns DW_DLV_OK.

    If this is not a 'symbolic' run, returns
    DW_DLV_NO_ENTRY.

    No errors are possible.
*/
/*ARGSUSED*/ int
dwarf_get_relocation_info_count(Dwarf_P_Debug dbg,
    Dwarf_Unsigned *
    count_of_relocation_sections,
    int *drd_buffer_version,
    UNUSEDARG Dwarf_Error * error)
{
    if (dbg->de_flags & DW_DLC_SYMBOLIC_RELOCATIONS) {
        int i = 0;
        unsigned int count = 0;

        for (i = 0; i < NUM_DEBUG_SECTIONS; ++i) {
            if (dbg->de_reloc_sect[i].pr_reloc_total_count > 0) {
                ++count;
            }
        }
        *count_of_relocation_sections = (Dwarf_Unsigned) count;
        *drd_buffer_version = DWARF_DRD_BUFFER_VERSION;
        return DW_DLV_OK;
    }
    /*  Reset to start at beginning of reloc groups. */
    dbg->de_reloc_next_to_return = 0;
    return DW_DLV_NO_ENTRY;
}

int
dwarf_get_relocation_info(Dwarf_P_Debug dbg,
    Dwarf_Signed * elf_section_index,
    Dwarf_Signed * elf_section_index_link,
    Dwarf_Unsigned * relocation_buffer_count,
    Dwarf_Relocation_Data * reldata_buffer,
    Dwarf_Error * error)
{
    int next = dbg->de_reloc_next_to_return;

    if (dbg->de_flags & DW_DLC_SYMBOLIC_RELOCATIONS) {
        int i = 0;

        for (i = next; i < NUM_DEBUG_SECTIONS; ++i) {
            /*  de_reloc_sect[] and de_elf_sects[] are
                in direct parallel. */
            Dwarf_P_Per_Reloc_Sect prel = &dbg->de_reloc_sect[i];
            int elf_sect_num =  dbg->de_elf_sects[i];

            if (prel->pr_reloc_total_count > 0) {
                /*  Set up 'next' for subsequent call to
                    dwarf_get_relocation_info(). */
                dbg->de_reloc_next_to_return = i + 1;

                /* ASSERT: prel->pr_block_count == 1 */
                *elf_section_index = prel->pr_sect_num_of_reloc_sect;

                /*  Elf sec num in generated elf */
                *elf_section_index_link = elf_sect_num;

                *relocation_buffer_count = prel->pr_reloc_total_count;
                *reldata_buffer = (Dwarf_Relocation_Data)
                    (prel->pr_first_block->rb_data);
                return DW_DLV_OK;
            }
        }
        DWARF_P_DBG_ERROR(dbg, DW_DLE_REL_ALLOC, DW_DLV_ERROR);
    }
    return DW_DLV_NO_ENTRY;
}