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 */ 59 int 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 */ 112 int 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 */ 160 int 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 214 dwarf_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 } 235 236 int 237 dwarf_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