/*-
* Copyright (c) 2009,2010,2023 Kai Wang
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "_libdwarf.h"
ELFTC_VCSID("$Id$");
#define _INIT_DWARF_STRTAB_SIZE 1024
int
_dwarf_strtab_add(Dwarf_Debug dbg, char *string, uint64_t *off,
Dwarf_Error *error)
{
size_t len;
assert(dbg != NULL && string != NULL);
len = strlen(string) + 1;
while (dbg->dbg_strtab_size + len > dbg->dbg_strtab_cap) {
dbg->dbg_strtab_cap *= 2;
dbg->dbg_strtab = realloc(dbg->dbg_strtab,
(size_t) dbg->dbg_strtab_cap);
if (dbg->dbg_strtab == NULL) {
DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
return (DW_DLE_MEMORY);
}
}
if (off != NULL)
*off = dbg->dbg_strtab_size;
memcpy(&dbg->dbg_strtab[dbg->dbg_strtab_size], string, len - 1);
dbg->dbg_strtab_size += len;
dbg->dbg_strtab[dbg->dbg_strtab_size - 1] = '\0';
return (DW_DLE_NONE);
}
char *
_dwarf_strtab_get_table(Dwarf_Debug dbg)
{
assert(dbg != NULL);
return (dbg->dbg_strtab);
}
char *
_dwarf_strtab_get_line_table(Dwarf_Debug dbg)
{
assert(dbg != NULL);
return (dbg->dbg_line_strtab);
}
static int
_dwarf_str_offsets_init(Dwarf_Debug dbg, Dwarf_Error *error)
{
Dwarf_Section *ds;
Dwarf_StrOffsets *str_off;
Dwarf_Half version;
uint64_t offset, length;
int dwarf_size;
assert(dbg != NULL);
dbg->dbg_str_offsets = NULL;
if ((ds = _dwarf_find_section(dbg, ".debug_str_offsets")) == NULL)
return (DW_DLE_NONE);
offset = 0;
/* Read in the table header. */
length = dbg->read(ds->ds_data, &offset, 4);
if (length == 0xffffffff) {
dwarf_size = 8;
length = dbg->read(ds->ds_data, &offset, 8);
} else
dwarf_size = 4;
version = dbg->read(ds->ds_data, &offset, 2);
if (version != 5) {
DWARF_SET_ERROR(dbg, error, DW_DLE_VERSION_STAMP_ERROR);
return (DW_DLE_VERSION_STAMP_ERROR);
}
if ((str_off = calloc(1, sizeof(*str_off))) == NULL) {
DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
return (DW_DLE_MEMORY);
}
/* 2 byte padding. */
offset += 2;
str_off->so_length = length;
str_off->so_version = version;
str_off->so_header_size = offset;
str_off->so_dwarf_size = dwarf_size;
str_off->so_data = ds->ds_data;
dbg->dbg_str_offsets = str_off;
return (DW_DLE_NONE);
}
static int
_dwarf_find_cu_str_offsets_base(Dwarf_Debug dbg, Dwarf_CU cu,
uint64_t *offset_basep, Dwarf_Error *error)
{
Dwarf_Attribute at;
Dwarf_Die cu_die;
int ret;
assert(dbg->dbg_str_offsets != NULL);
if (!cu->cu_stroff_base_valid) {
if ((ret = dwarf_siblingof(dbg, 0, &cu_die, error)) !=
DW_DLV_OK) {
DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
return (DW_DLE_NO_ENTRY);
}
if ((at = _dwarf_attr_find(cu_die, DW_AT_str_offsets_base)) !=
NULL) {
cu->cu_stroff_base = at->u[0].u64;
} else {
/*
* No DW_AT_str_offsets_base found. Use header size
* instead.
*/
cu->cu_stroff_base =
dbg->dbg_str_offsets->so_header_size;
}
cu->cu_stroff_base_valid = 1;
dwarf_dealloc(dbg, cu_die, DW_DLA_DIE);
}
*offset_basep = cu->cu_stroff_base;
return (DW_DLE_NONE);
}
int
_dwarf_read_indexed_str(Dwarf_Debug dbg, Dwarf_CU cu, uint64_t index,
char **str_p, Dwarf_Error *error)
{
Dwarf_StrOffsets *so;
uint64_t offset, offsets_base, strtab_offset;
int ret;
if (dbg->dbg_str_offsets == NULL) {
if ((ret = _dwarf_str_offsets_init(dbg, error)) != DW_DLE_NONE)
return (ret);
if (dbg->dbg_str_offsets == NULL) {
DWARF_SET_ERROR(dbg, error, DW_DLE_NO_ENTRY);
return (DW_DLE_NO_ENTRY);
}
}
if ((ret = _dwarf_find_cu_str_offsets_base(dbg, cu, &offsets_base,
error)) != DW_DLE_NONE)
return (ret);
so = dbg->dbg_str_offsets;
/* Caculate where to read from string offsets array. */
offset = offsets_base + so->so_dwarf_size * index;
/* Read from the str offsets array to get offset into string table. */
strtab_offset = dbg->read(so->so_data, &offset, so->so_dwarf_size);
*str_p = _dwarf_strtab_get_table(dbg) + strtab_offset;
return (DW_DLE_NONE);
}
int
_dwarf_strtab_init(Dwarf_Debug dbg, Dwarf_Error *error)
{
Dwarf_Section *ds;
assert(dbg != NULL);
if (dbg->dbg_mode == DW_DLC_READ || dbg->dbg_mode == DW_DLC_RDWR) {
ds = _dwarf_find_section(dbg, ".debug_str");
if (ds == NULL) {
dbg->dbg_strtab = NULL;
dbg->dbg_strtab_cap = dbg->dbg_strtab_size = 0;
return (DW_DLE_NONE);
}
dbg->dbg_strtab_cap = dbg->dbg_strtab_size = ds->ds_size;
if (dbg->dbg_mode == DW_DLC_RDWR) {
if ((dbg->dbg_strtab = malloc((size_t) ds->ds_size)) ==
NULL) {
DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
return (DW_DLE_MEMORY);
}
memcpy(dbg->dbg_strtab, ds->ds_data, ds->ds_size);
} else
dbg->dbg_strtab = (char *) ds->ds_data;
ds = _dwarf_find_section(dbg, ".debug_line_str");
if (ds != NULL) {
dbg->dbg_line_strtab = (char *) ds->ds_data;
}
} else {
/* DW_DLC_WRITE */
dbg->dbg_strtab_cap = _INIT_DWARF_STRTAB_SIZE;
dbg->dbg_strtab_size = 0;
if ((dbg->dbg_strtab = malloc((size_t) dbg->dbg_strtab_cap)) ==
NULL) {
DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
return (DW_DLE_MEMORY);
}
dbg->dbg_strtab[0] = '\0';
}
return (DW_DLE_NONE);
}
void
_dwarf_str_offsets_cleanup(Dwarf_Debug dbg)
{
assert(dbg != NULL);
if (dbg->dbg_str_offsets)
free(dbg->dbg_str_offsets);
}
void
_dwarf_strtab_cleanup(Dwarf_Debug dbg)
{
assert(dbg != NULL);
if (dbg->dbg_mode == DW_DLC_RDWR || dbg->dbg_mode == DW_DLC_WRITE)
free(dbg->dbg_strtab);
}
int
_dwarf_strtab_gen(Dwarf_P_Debug dbg, Dwarf_Error *error)
{
Dwarf_P_Section ds;
int ret;
assert(dbg != NULL);
if ((ret = _dwarf_section_init(dbg, &ds, ".debug_str", 0, error)) !=
DW_DLE_NONE)
return (ret);
if (dbg->dbg_strtab_size > ds->ds_cap) {
ds->ds_data = realloc(ds->ds_data,
(size_t) dbg->dbg_strtab_size);
if (ds->ds_data == NULL) {
_dwarf_section_free(dbg, &ds);
DWARF_SET_ERROR(dbg, error, DW_DLE_MEMORY);
return (DW_DLE_MEMORY);
}
ds->ds_cap = dbg->dbg_strtab_size;
}
memcpy(ds->ds_data, dbg->dbg_strtab, dbg->dbg_strtab_size);
ds->ds_size = dbg->dbg_strtab_size;
/*
* Inform application the creation of .debug_str ELF section.
* Note that .debug_str use a different format than usual ELF
* string table, so it should not have SHT_STRTAB as its type.
*/
ret = _dwarf_section_callback(dbg, ds, SHT_PROGBITS, 0, 0, 0, error);
return (ret);
}
