/*
* This function is slow because it doesn't use the memory.
* It is useful at few calls like get_str_osrelease_from_vmlinux().
*/
off_t
vaddr_to_offset_slow(int fd, char *filename, unsigned long long vaddr)
{
off_t offset = 0;
int i, phnum, flag_elf64, elf_format;
unsigned int num_load;
Elf64_Phdr load64;
Elf32_Phdr load32;
elf_format = check_elf_format(fd, filename, &phnum, &num_load);
if (elf_format == ELF64)
flag_elf64 = TRUE;
else if (elf_format == ELF32)
flag_elf64 = FALSE;
else
return 0;
for (i = 0; i < phnum; i++) {
if (flag_elf64) { /* ELF64 */
if (!get_elf64_phdr(fd, filename, i, &load64)) {
ERRMSG("Can't find Phdr %d.\n", i);
return 0;
}
if (load64.p_type != PT_LOAD)
continue;
if ((vaddr < load64.p_vaddr)
|| (load64.p_vaddr + load64.p_filesz <= vaddr))
continue;
offset = load64.p_offset + (vaddr - load64.p_vaddr);
break;
} else { /* ELF32 */
if (!get_elf32_phdr(fd, filename, i, &load32)) {
ERRMSG("Can't find Phdr %d.\n", i);
return 0;
}
if (load32.p_type != PT_LOAD)
continue;
if ((vaddr < load32.p_vaddr)
|| (load32.p_vaddr + load32.p_filesz <= vaddr))
continue;
offset = load32.p_offset + (vaddr - load32.p_vaddr);
break;
}
}
return offset;
}
/* Note, the `start_addr' should NOT be NULL! */
BinParser* get_parser(const uint8_t* start_addr, uint64_t len)
{
assert(start_addr != NULL);
bin_fmt_t bf = BF_UNKNOWN;
bf = check_elf_format(start_addr, len);
if (bf == BF_ELF64) return new Elf64Parser(start_addr, len);
/* Doesn't matter whether it is an ELF32 shared library or not,
* here we just make sure that the factory method won't return
* NULL.
*/
return new Elf32Parser(start_addr, len);
}
/*
* Get ELF information about /proc/vmcore.
*/
int
get_elf_info(int fd, char *filename)
{
int i, j, phnum, elf_format;
Elf64_Phdr phdr;
/*
* Check ELF64 or ELF32.
*/
elf_format = check_elf_format(fd, filename, &phnum, &num_pt_loads);
if (elf_format == ELF64)
flags_memory |= MEMORY_ELF64;
else if (elf_format != ELF32)
return FALSE;
if (!num_pt_loads) {
ERRMSG("Can't get the number of PT_LOAD.\n");
return FALSE;
}
/*
* The below file information will be used as /proc/vmcore.
*/
fd_memory = fd;
name_memory = filename;
pt_loads = calloc(sizeof(struct pt_load_segment), num_pt_loads);
if (pt_loads == NULL) {
ERRMSG("Can't allocate memory for the PT_LOAD. %s\n",
strerror(errno));
return FALSE;
}
for (i = 0, j = 0; i < phnum; i++) {
if (!get_phdr_memory(i, &phdr))
return FALSE;
if (phdr.p_type == PT_NOTE) {
set_pt_note(phdr.p_offset, phdr.p_filesz);
}
if (phdr.p_type != PT_LOAD)
continue;
if (j == 0) {
offset_pt_load_memory = phdr.p_offset;
if (offset_pt_load_memory == 0) {
ERRMSG("Can't get the offset of page data.\n");
return FALSE;
}
}
if (j >= num_pt_loads)
return FALSE;
if(!dump_Elf_load(&phdr, j))
return FALSE;
j++;
}
max_file_offset = 0;
for (i = 0; i < num_pt_loads; ++i) {
struct pt_load_segment *p = &pt_loads[i];
max_file_offset = MAX(max_file_offset,
p->file_offset + p->phys_end - p->phys_start);
}
if (!has_pt_note()) {
ERRMSG("Can't find PT_NOTE Phdr.\n");
return FALSE;
}
if (!get_pt_note_info()) {
ERRMSG("Can't get PT_NOTE information.\n");
return FALSE;
}
return TRUE;
}
