void
load_module (char * file)
{
FILE* handle;
char * error;
HOOKED * hook;
handle = dlopen (file, RTLD_LAZY);
if (!handle)
{
fprintf (stderr, "Couldn't load %s: %s\n", file, dlerror ());
exit(1);
}
dlerror();
hook = (HOOKED *) dlsym (handle, "hook");
hook->size = ((int (*)()) dlsym(handle,"hook_size"))();
if ((error = dlerror ()))
{
fprintf (stderr, "Couldn't initialize the hook function.\n\t%s\n", error);
exit(1);
}
load_hook (hook);
}
/* Load every loadable segment into memory specified by `_load_hook'. */
grub_err_t
grub_elf32_load (grub_elf_t _elf, grub_elf32_load_hook_t _load_hook,
grub_addr_t *base, grub_size_t *size)
{
grub_addr_t load_base = (grub_addr_t) -1ULL;
grub_size_t load_size = 0;
grub_err_t err;
auto int NESTED_FUNC_ATTR grub_elf32_load_segment (grub_elf_t elf, Elf32_Phdr *phdr, void *hook);
int NESTED_FUNC_ATTR grub_elf32_load_segment (grub_elf_t elf, Elf32_Phdr *phdr, void *hook)
{
grub_elf32_load_hook_t load_hook = (grub_elf32_load_hook_t) hook;
grub_addr_t load_addr;
int do_load = 1;
load_addr = phdr->p_paddr;
if (load_hook && load_hook (phdr, &load_addr, &do_load))
return 1;
if (! do_load)
return 0;
if (load_addr < load_base)
load_base = load_addr;
grub_dprintf ("elf", "Loading segment at 0x%llx, size 0x%llx\n",
(unsigned long long) load_addr,
(unsigned long long) phdr->p_memsz);
if (grub_file_seek (elf->file, phdr->p_offset) == (grub_off_t) -1)
{
grub_error_push ();
return grub_error (GRUB_ERR_BAD_OS,
"invalid offset in program header");
}
if (phdr->p_filesz)
{
grub_ssize_t read;
read = grub_file_read (elf->file, (void *) load_addr, phdr->p_filesz);
if (read != (grub_ssize_t) phdr->p_filesz)
{
/* XXX How can we free memory from `load_hook'? */
grub_error_push ();
return grub_error (GRUB_ERR_BAD_OS,
"couldn't read segment from file: "
"wanted 0x%lx bytes; read 0x%lx bytes",
phdr->p_filesz, read);
}
}
if (phdr->p_filesz < phdr->p_memsz)
grub_memset ((void *) (long) (load_addr + phdr->p_filesz),
0, phdr->p_memsz - phdr->p_filesz);
load_size += phdr->p_memsz;
return 0;
}
