/**
* Get comment section
* @param file
* @return
*/
elfshsect_t *elfsh_get_comments(elfshobj_t *file)
{
elfshsect_t *enew;
int size;
PROFILER_IN(__FILE__, __FUNCTION__, __LINE__);
if (NULL == file)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Invalid NULL paramater", NULL);
enew = elfsh_get_section_by_name(file, ELFSH_SECTION_NAME_COMMENT,
NULL, NULL, &size);
if (NULL == enew)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Unable to get .comment by name", NULL);
if (NULL == elfsh_readmem(enew))
{
enew->data = elfsh_load_section(file, enew->shdr);
if (NULL == elfsh_readmem(enew))
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Unable to load .comment", NULL);
}
file->secthash[ELFSH_SECTION_COMMENT] = enew;
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, (enew));
}
/**
* Return a pointer on ".reginfo" ri_gp_value
* @param file
* @return
*/
elfsh_Sword *elfsh_get_gpvalue_addr(elfshobj_t* file)
{
elfshsect_t *reginfo;
PROFILER_IN(__FILE__, __FUNCTION__, __LINE__);
if (file == NULL)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Invalid NULL parameter", NULL);
reginfo = elfsh_get_section_by_name(file,".reginfo", NULL, NULL, NULL);
if (reginfo == NULL)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"No .reginfo section", NULL);
if (reginfo->data == NULL)
reginfo->data = elfsh_load_section(file, reginfo->shdr);
if (reginfo->data == NULL)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Can't read .reginfo section", NULL);
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__,
(&((elfsh_RegInfo *) elfsh_readmem(reginfo))->ri_gp_value));
}
/**
* Return a ptr on the symbol table
* @param file
* @param num
* @return
*/
void *elfsh_get_symtab(elfshobj_t *file, int *num)
{
elfshsect_t *s;
int strindex;
int index;
int nbr;
PROFILER_IN(__FILE__, __FUNCTION__, __LINE__);
/* Sanity checks */
if (file == NULL)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Invalid NULL parameter", NULL);
else if (NULL == file->sht && NULL == elfsh_get_sht(file, NULL))
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Unable to get SHT", NULL);
if (file->secthash[ELFSH_SECTION_SYMTAB] == NULL)
{
//fprintf(stderr, "Loading symtab for object %s \n", file->name);
/* If symtab is already loaded, return it */
s = elfsh_get_section_by_type(file, SHT_SYMTAB,
0, &index,
&strindex, &nbr);
if (s != NULL)
{
file->secthash[ELFSH_SECTION_SYMTAB] = s;
s->data = elfsh_load_section(file, s->shdr);
if (s->data == NULL)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Unable to load SYMTAB", NULL);
s->curend = s->shdr->sh_size;
/* Now load the string table */
s = elfsh_get_strtab(file, s->shdr->sh_link);
if (NULL == s)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Unable to load STRTAB", NULL);
s->parent = file;
}
/*
** Fix 0 lenght syms and STT_SECTION syms
** Create a minimal .symtab if unexistant
*/
elfsh_fixup_symtab(file, &strindex);
//fprintf(stderr, "symtab FIXED for object %s \n", file->name);
}
if (num != NULL)
*num =
file->secthash[ELFSH_SECTION_SYMTAB]->curend / sizeof(elfsh_Sym);
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__,
(file->secthash[ELFSH_SECTION_SYMTAB]->data));
}
/**
* Retreive strtab
* @param file
* @param index
* @return
*/
elfshsect_t *elfsh_get_strtab(elfshobj_t *file, int index)
{
elfshsect_t *s;
PROFILER_IN(__FILE__, __FUNCTION__, __LINE__);
/* Sanity checks */
if (file == NULL)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Invalid NULL parameter", NULL);
s = file->secthash[ELFSH_SECTION_STRTAB];
if (s)
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, s);
/* Read the string table */
if (index > 0)
s = elfsh_get_section_by_index(file, index, NULL, NULL);
else
s = elfsh_get_section_by_name(file, ELFSH_SECTION_NAME_STRTAB,
NULL, NULL, NULL);
/* Section is present */
if (s != NULL)
{
file->secthash[ELFSH_SECTION_STRTAB] = s;
s->shdr->sh_link = file->secthash[ELFSH_SECTION_SYMTAB]->index;
if (s->data == NULL)
{
s->data = elfsh_load_section(file, s->shdr);
if (s->data == NULL)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Unable to load STRTAB", NULL);
}
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, (s));
}
/* Section is not present */
s = elfsh_rebuild_strtab(file);
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, (s));
}
/**
* Read the destructor array in .dtors
* @param file
* @param num
* @return
*/
eresi_Addr *elfsh_get_dtors(elfshobj_t *file, int *num)
{
elfshsect_t *enew;
PROFILER_IN(__FILE__, __FUNCTION__, __LINE__);
/* Sanity checks */
if (file == NULL)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Invalid NULL parameter", NULL);
/* Load dtors */
enew = file->secthash[ELFSH_SECTION_DTORS];
if (enew == NULL)
{
enew = elfsh_get_section_by_name(file, ELFSH_SECTION_NAME_DTORS,
NULL, NULL, NULL);
if (NULL == enew)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Unable to get DTORS by name", NULL);
}
/* Read dtors */
if (NULL == enew->data)
{
enew->data = elfsh_load_section(file, enew->shdr);
if (NULL == enew->data)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Unable to load DTORS", NULL);
file->secthash[ELFSH_SECTION_DTORS] = enew;
}
/* Return data */
if (num != NULL)
*num = enew->shdr->sh_size / sizeof(eresi_Addr);
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, (elfsh_readmem(enew)));
}
/**
* Change endianess of .dynamic
* @param newent
* @return
*/
int elfsh_endianize_dynamic(elfshsect_t *newent)
{
elfsh_Dyn *dyn;
u_int idx;
PROFILER_IN(__FILE__, __FUNCTION__, __LINE__);
/* Sanity check */
if (!newent)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Invalid NULL parameter", -1);
#if __BYTE_ORDER == __LITTLE_ENDIAN
if (newent->parent->hdr->e_ident[EI_DATA] == ELFDATA2MSB) {
#elif __BYTE_ORDER == __BIG_ENDIAN
if (newent->parent->hdr->e_ident[EI_DATA] == ELFDATA2LSB) {
#else
#error Unexpected __BYTE_ORDER !
#endif
dyn = (elfsh_Dyn *) elfsh_readmem(newent);
for (idx = 0; idx < newent->shdr->sh_size / sizeof(elfsh_Dyn); idx++)
{
dyn[idx].d_tag = swaplong(dyn[idx].d_tag);
dyn[idx].d_un.d_val = swaplong(dyn[idx].d_un.d_val);
}
}
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, 0);
}
/**
* Return a ptr on the dynamic section
* @param file
* @param num
* @return
*/
elfsh_Dyn *elfsh_get_dynamic(elfshobj_t *file, u_int *num)
{
elfshsect_t *newent = NULL; /* to shut gcc up with -Wall */
int nbr;
elfsh_Dyn *ret;
PROFILER_IN(__FILE__, __FUNCTION__, __LINE__);
if (file->secthash[ELFSH_SECTION_DYNAMIC] == NULL)
{
newent = elfsh_get_section_by_type(file, SHT_DYNAMIC, NULL, NULL, &nbr, 0);
if (newent == NULL)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Unable to get .dynamic by type", NULL);
file->secthash[ELFSH_SECTION_DYNAMIC] = newent;
}
newent = file->secthash[ELFSH_SECTION_DYNAMIC];
nbr = file->secthash[ELFSH_SECTION_DYNAMIC]->shdr->sh_size /
sizeof(elfsh_Dyn);
if (num != NULL)
*num = nbr;
if (newent->data == NULL)
{
newent->data = elfsh_load_section(file, newent->shdr);
if (newent->data == NULL)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Unable to load .dynamic", NULL);
elfsh_endianize_dynamic(newent);
}
ret = (elfsh_Dyn *) elfsh_readmem(newent);
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, ret);
}
