static inline int
_rtld_relocate_plt_object(const Obj_Entry *obj, const Elf_Rela *rela, Elf_Addr *tp)
{
Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
Elf_Addr new_value;
const Elf_Sym *def;
const Obj_Entry *defobj;
unsigned long info = rela->r_info;
assert(ELF_R_TYPE(info) == R_TYPE(JMP_SLOT));
def = _rtld_find_plt_symdef(ELF_R_SYM(info), obj, &defobj, tp != NULL);
if (__predict_false(def == NULL))
return -1;
if (__predict_false(def == &_rtld_sym_zero))
return 0;
new_value = (Elf_Addr)(defobj->relocbase + def->st_value +
rela->r_addend);
rdbg(("bind now/fixup in %s --> old=%p new=%p",
defobj->strtab + def->st_name, (void *)*where, (void *)new_value));
if (*where != new_value)
*where = new_value;
if (tp)
*tp = new_value - rela->r_addend;
return 0;
}
static int
_rtld_relocate_plt_object(const Obj_Entry *obj, const Elf_Rel *rel,
Elf_Addr *tp)
{
Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rel->r_offset);
Elf_Addr new_value;
const Elf_Sym *def;
const Obj_Entry *defobj;
unsigned long info = rel->r_info;
assert(ELF_R_TYPE(info) == R_TYPE(JUMP_SLOT));
def = _rtld_find_plt_symdef(ELF_R_SYM(info), obj, &defobj, tp != NULL);
if (__predict_false(def == NULL))
return -1;
if (__predict_false(def == &_rtld_sym_zero))
return 0;
if (ELF_ST_TYPE(def->st_info) == STT_GNU_IFUNC) {
if (tp == NULL)
return 0;
new_value = _rtld_resolve_ifunc(defobj, def);
} else {
new_value = (Elf_Addr)(defobj->relocbase + def->st_value);
}
rdbg(("bind now/fixup in %s --> old=%p new=%p",
defobj->strtab + def->st_name, (void *)*where, (void *)new_value));
if (*where != new_value)
*where = new_value;
if (tp)
*tp = new_value;
return 0;
}
static int
_rtld_do_copy_relocation(const Obj_Entry *dstobj, const Elf_Rela *rela)
{
void *dstaddr = (void *)(dstobj->relocbase + rela->r_offset);
const Elf_Sym *dstsym = dstobj->symtab + ELF_R_SYM(rela->r_info);
const char *name = dstobj->strtab + dstsym->st_name;
unsigned long hash = _rtld_elf_hash(name);
size_t size = dstsym->st_size;
const void *srcaddr;
const Elf_Sym *srcsym = NULL;
Obj_Entry *srcobj;
for (srcobj = dstobj->next; srcobj != NULL; srcobj = srcobj->next)
if ((srcsym = _rtld_symlook_obj(name, hash, srcobj, false)) != NULL)
break;
if (srcobj == NULL) {
_rtld_error("Undefined symbol \"%s\" referenced from COPY"
" relocation in %s", name, dstobj->path);
return (-1);
}
srcaddr = (const void *)(srcobj->relocbase + srcsym->st_value);
(void)memcpy(dstaddr, srcaddr, size);
rdbg(("COPY %s %s %s --> src=%p dst=%p size %ld",
dstobj->path, srcobj->path, name, srcaddr,
(void *)dstaddr, (long)size));
return (0);
}
static inline int
_rtld_relocate_plt_object(const Obj_Entry *obj, Elf_Word sym, Elf_Addr *tp)
{
Elf_Addr *got = obj->pltgot;
const Elf_Sym *def;
const Obj_Entry *defobj;
Elf_Addr new_value;
def = _rtld_find_plt_symdef(sym, obj, &defobj, tp != NULL);
if (__predict_false(def == NULL))
return -1;
if (__predict_false(def == &_rtld_sym_zero))
return 0;
if (ELF_ST_TYPE(def->st_info) == STT_GNU_IFUNC) {
if (tp == NULL)
return 0;
new_value = _rtld_resolve_ifunc(defobj, def);
} else {
new_value = (Elf_Addr)(defobj->relocbase + def->st_value);
}
rdbg(("bind now/fixup in %s --> new=%p",
defobj->strtab + def->st_name, (void *)new_value));
got[obj->local_gotno + sym - obj->gotsym] = new_value;
if (tp)
*tp = new_value;
return 0;
}
static void read_cb(struct ev_loop *loop, struct ev_io *watcher, int revents) {
if(EV_ERROR & revents) {
rdlog(LOG_ERR,"Read callback error: %s",mystrerror(errno,errbuf,
ERROR_BUFFER_SIZE));
}
struct connection_private *connection = (struct connection_private *) watcher->data;
struct sockaddr_in6 saddr;
#ifdef CONNECTION_PRIVATE_MAGIC
assert(connection->magic == CONNECTION_PRIVATE_MAGIC);
#endif
char *buffer = calloc(READ_BUFFER_SIZE,sizeof(char));
const int recv_result = receive_from_socket(watcher->fd,&saddr,buffer,READ_BUFFER_SIZE);
if(recv_result > 0){
process_data_received_from_socket(buffer,(size_t)recv_result,connection->client,
connection->callback,connection->callback_opaque);
}else if(recv_result < 0){
if(errno == EAGAIN){
rdbg("Socket not ready. re-trying");
free(buffer);
return;
}else{
rdlog(LOG_ERR,"Recv error: %s",mystrerror(errno,errbuf,ERROR_BUFFER_SIZE));
free(buffer);
close_socket_and_stop_watcher(loop,watcher);
return;
}
}else{ /* recv_result == 0 */
free(buffer);
close_socket_and_stop_watcher(loop,watcher);
return;
}
if(NULL!=global_config.response && !connection->first_response_sent){
int send_ret = 1;
rdlog(LOG_DEBUG,"Sending first response...");
if(global_config.response_len == 0){
rdlog(LOG_ERR,"Can't send first response to %s: size of response == 0",connection->client);
connection->first_response_sent = 1;
} else {
send_ret = send_to_socket(watcher->fd,global_config.response,(size_t)global_config.response_len-1);
}
if(send_ret <= 0){
rdlog(LOG_ERR,"Cannot send first response to %s socket: %s",
connection->client, mystrerror(errno,errbuf,ERROR_BUFFER_SIZE));
close_socket_and_stop_watcher(loop,watcher);
}
rdlog(LOG_DEBUG,"first response ok");
connection->first_response_sent = 1;
}
}
int
_rtld_relocate_plt_lazy(const Obj_Entry *obj)
{
if (!obj->relocbase)
return 0;
for (const Elf_Rel *rel = obj->pltrel; rel < obj->pltrellim; rel++) {
Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rel->r_offset);
assert(ELF_R_TYPE(rel->r_info) == R_TYPE(JUMP_SLOT));
/* Just relocate the GOT slots pointing into the PLT */
*where += (Elf_Addr)obj->relocbase;
rdbg(("fixup !main in %s --> %p", obj->path, (void *)*where));
}
return 0;
}
int
_rtld_relocate_plt_lazy(const Obj_Entry *obj)
{
const Elf_Rela *rela;
if (!obj->relocbase)
return 0;
for (rela = obj->pltrela; rela < obj->pltrelalim; rela++) {
Elf_Addr *where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
assert(ELF_R_TYPE(rela->r_info) == R_TYPE(JMP_SLOT));
/* Just relocate the GOT slots pointing into the PLT */
*where += (Elf_Addr)obj->relocbase;
rdbg(("lazy fixup pltgot %p in %s --> %p", where, obj->path,
(void *)*where));
}
return 0;
}
int
_rtld_relocate_nonplt_objects(Obj_Entry *obj)
{
for (const Elf_Rela *rela = obj->rela; rela < obj->relalim; rela++) {
Elf_Addr *where;
const Elf_Sym *def;
const Obj_Entry *defobj;
unsigned long symnum;
Elf_Addr addend;
where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
symnum = ELF_R_SYM(rela->r_info);
addend = rela->r_addend;
switch (ELF_R_TYPE(rela->r_info)) {
case R_TYPE(NONE):
break;
case R_TYPE(ABS64): /* word B + S + A */
case R_TYPE(GLOB_DAT): /* word B + S */
def = _rtld_find_symdef(symnum, obj, &defobj, false);
if (def == NULL)
return -1;
*where = addend + (Elf_Addr)defobj->relocbase +
def->st_value;
rdbg(("ABS64/GLOB_DAT %s in %s --> %p @ %p in %s",
obj->strtab + obj->symtab[symnum].st_name,
obj->path, (void *)tmp, where, defobj->path));
break;
case R_TYPE(RELATIVE): /* word B + A */
*where = addend + (Elf_Addr)obj->relocbase;
rdbg(("RELATIVE in %s --> %p", obj->path,
(void *)tmp));
break;
case R_TYPE(COPY):
/*
* These are deferred until all other relocations have
* been done. All we do here is make sure that the
* COPY relocation is not in a shared library. They
* are allowed only in executable files.
*/
if (obj->isdynamic) {
_rtld_error(
"%s: Unexpected R_COPY relocation in shared library",
obj->path);
return -1;
}
rdbg(("COPY (avoid in main)"));
break;
case R_TLS_TYPE(TLS_DTPREL):
def = _rtld_find_symdef(symnum, obj, &defobj, false);
if (def == NULL)
return -1;
*where = addend + (Elf_Addr)(def->st_value);
rdbg(("TLS_DTPOFF32 %s in %s --> %p",
obj->strtab + obj->symtab[symnum].st_name,
obj->path, (void *)tmp));
break;
case R_TLS_TYPE(TLS_DTPMOD):
def = _rtld_find_symdef(symnum, obj, &defobj, false);
if (def == NULL)
return -1;
*where = (Elf_Addr)(defobj->tlsindex);
rdbg(("TLS_DTPMOD %s in %s --> %p",
obj->strtab + obj->symtab[symnum].st_name,
obj->path, (void *)tmp));
break;
case R_TLS_TYPE(TLS_TPREL):
def = _rtld_find_symdef(symnum, obj, &defobj, false);
if (def == NULL)
return -1;
if (!defobj->tls_done &&
_rtld_tls_offset_allocate(obj))
return -1;
*where = (Elf_Addr)def->st_value + defobj->tlsoffset +
sizeof(struct tls_tcb);
rdbg(("TLS_TPOFF32 %s in %s --> %p",
obj->strtab + obj->symtab[symnum].st_name,
obj->path, (void *)tmp));
break;
default:
rdbg(("sym = %lu, type = %lu, offset = %p, "
"contents = %p, symbol = %s",
symnum, (u_long)ELF_R_TYPE(rela->r_info),
(void *)rela->r_offset, *where,
obj->strtab + obj->symtab[symnum].st_name));
_rtld_error("%s: Unsupported relocation type %ld "
"in non-PLT relocations",
obj->path, (u_long) ELF_R_TYPE(rela->r_info));
return -1;
}
}
return 0;
}
/*
* Relocate newly-loaded shared objects. The argument is a pointer to
* the Obj_Entry for the first such object. All objects from the first
* to the end of the list of objects are relocated. Returns 0 on success,
* or -1 on failure.
*/
int
_rtld_relocate_objects(Obj_Entry *first, bool bind_now)
{
Obj_Entry *obj;
int ok = 1;
for (obj = first; obj != NULL; obj = obj->next) {
if (obj->nbuckets == 0 || obj->nchains == 0 ||
obj->buckets == NULL || obj->symtab == NULL ||
obj->strtab == NULL) {
_rtld_error("%s: Shared object has no run-time"
" symbol table", obj->path);
return -1;
}
if (obj->nbuckets == UINT32_MAX) {
_rtld_error("%s: Symbol table too large", obj->path);
return -1;
}
rdbg((" relocating %s (%ld/%ld rel/rela, %ld/%ld plt rel/rela)",
obj->path,
(long)(obj->rellim - obj->rel),
(long)(obj->relalim - obj->rela),
(long)(obj->pltrellim - obj->pltrel),
(long)(obj->pltrelalim - obj->pltrela)));
#ifndef __minix
if (obj->textrel) {
/*
* There are relocations to the write-protected text
* segment.
*/
if (mprotect(obj->mapbase, obj->textsize,
PROT_READ | PROT_WRITE | PROT_EXEC) == -1) {
_rtld_error("%s: Cannot write-enable text "
"segment: %s", obj->path, xstrerror(errno));
return -1;
}
}
#endif
dbg(("doing non-PLT relocations"));
if (_rtld_relocate_nonplt_objects(obj) < 0)
ok = 0;
#ifndef __minix
if (obj->textrel) { /* Re-protected the text segment. */
if (mprotect(obj->mapbase, obj->textsize,
PROT_READ | PROT_EXEC) == -1) {
_rtld_error("%s: Cannot write-protect text "
"segment: %s", obj->path, xstrerror(errno));
return -1;
}
}
#endif
dbg(("doing lazy PLT binding"));
if (_rtld_relocate_plt_lazy(obj) < 0)
ok = 0;
#if defined(__hppa__)
bind_now = 1;
#endif
if (obj->z_now || bind_now) {
dbg(("doing immediate PLT binding"));
if (_rtld_relocate_plt_objects(obj) < 0)
ok = 0;
}
if (!ok)
return -1;
/* Set some sanity-checking numbers in the Obj_Entry. */
obj->magic = RTLD_MAGIC;
obj->version = RTLD_VERSION;
/* Fill in the dynamic linker entry points. */
obj->dlopen = dlopen;
obj->dlsym = dlsym;
obj->dlerror = dlerror;
obj->dlclose = dlclose;
obj->dladdr = dladdr;
dbg(("fixing up PLTGOT"));
/* Set the special PLTGOT entries. */
if (obj->pltgot != NULL)
_rtld_setup_pltgot(obj);
}
return 0;
}
int
_rtld_relocate_nonplt_objects(Obj_Entry *obj)
{
const Elf_Rela *rela;
for (rela = obj->rela; rela < obj->relalim; rela++) {
Elf_Addr *where;
const Elf_Sym *def;
const Obj_Entry *defobj;
Elf_Addr tmp;
unsigned long symnum;
where = (Elf_Addr *)(obj->relocbase + rela->r_offset);
symnum = ELF_R_SYM(rela->r_info);
switch (ELF_R_TYPE(rela->r_info)) {
case R_TYPE(NONE):
break;
case R_TYPE(32): /* word32 S + A */
case R_TYPE(GLOB_DAT): /* word32 S + A */
def = _rtld_find_symdef(symnum, obj, &defobj, false);
if (def == NULL)
return -1;
tmp = (Elf_Addr)(defobj->relocbase + def->st_value +
rela->r_addend);
if (*where != tmp)
*where = tmp;
rdbg(("32/GLOB_DAT %s in %s --> %p in %s",
obj->strtab + obj->symtab[symnum].st_name,
obj->path, (void *)*where, defobj->path));
break;
case R_TYPE(RELATIVE): /* word32 B + A */
tmp = (Elf_Addr)(obj->relocbase + rela->r_addend);
if (*where != tmp)
*where = tmp;
rdbg(("RELATIVE in %s --> %p", obj->path,
(void *)*where));
break;
case R_TYPE(COPY):
/*
* These are deferred until all other relocations have
* been done. All we do here is make sure that the
* COPY relocation is not in a shared library. They
* are allowed only in executable files.
*/
if (obj->isdynamic) {
_rtld_error(
"%s: Unexpected R_COPY relocation in shared library",
obj->path);
return -1;
}
rdbg(("COPY (avoid in main)"));
break;
default:
rdbg(("sym = %lu, type = %lu, offset = %p, "
"addend = %p, contents = %p, symbol = %s",
symnum, (u_long)ELF_R_TYPE(rela->r_info),
(void *)rela->r_offset, (void *)rela->r_addend,
(void *)*where,
obj->strtab + obj->symtab[symnum].st_name));
_rtld_error("%s: Unsupported relocation type %ld "
"in non-PLT relocations",
obj->path, (u_long) ELF_R_TYPE(rela->r_info));
return -1;
}
}
return 0;
}
static void set_keepalive_opt(int fd){
int i=1;
const int sso_rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (char*)&i, sizeof(int));
if(sso_rc == -1)
rdbg("Can't set SO_KEEPALIVE option");
}
int
_rtld_relocate_nonplt_objects(Obj_Entry *obj)
{
const Elf_Rel *rel;
for (rel = obj->rel; rel < obj->rellim; rel++) {
Elf_Addr *where;
const Elf_Sym *def;
const Obj_Entry *defobj;
Elf_Addr tmp;
unsigned long symnum;
where = (Elf_Addr *)(obj->relocbase + rel->r_offset);
symnum = ELF_R_SYM(rel->r_info);
switch (ELF_R_TYPE(rel->r_info)) {
case R_TYPE(NONE):
break;
#if 1 /* XXX should not occur */
case R_TYPE(PC24): { /* word32 S - P + A */
Elf32_Sword addend;
/*
* Extract addend and sign-extend if needed.
*/
addend = *where;
if (addend & 0x00800000)
addend |= 0xff000000;
def = _rtld_find_symdef(symnum, obj, &defobj, false);
if (def == NULL)
return -1;
tmp = (Elf_Addr)obj->relocbase + def->st_value
- (Elf_Addr)where + (addend << 2);
if ((tmp & 0xfe000000) != 0xfe000000 &&
(tmp & 0xfe000000) != 0) {
_rtld_error(
"%s: R_ARM_PC24 relocation @ %p to %s failed "
"(displacement %ld (%#lx) out of range)",
obj->path, where,
obj->strtab + obj->symtab[symnum].st_name,
(long) tmp, (long) tmp);
return -1;
}
tmp >>= 2;
*where = (*where & 0xff000000) | (tmp & 0x00ffffff);
rdbg(("PC24 %s in %s --> %p @ %p in %s",
obj->strtab + obj->symtab[symnum].st_name,
obj->path, (void *)*where, where, defobj->path));
break;
}
#endif
case R_TYPE(ABS32): /* word32 B + S + A */
case R_TYPE(GLOB_DAT): /* word32 B + S */
def = _rtld_find_symdef(symnum, obj, &defobj, false);
if (def == NULL)
return -1;
if (__predict_true(RELOC_ALIGNED_P(where))) {
tmp = *where + (Elf_Addr)defobj->relocbase +
def->st_value;
/* Set the Thumb bit, if needed. */
if (ELF_ST_TYPE(def->st_info) == STT_ARM_TFUNC)
tmp |= 1;
*where = tmp;
} else {
tmp = load_ptr(where) +
(Elf_Addr)defobj->relocbase +
def->st_value;
/* Set the Thumb bit, if needed. */
if (ELF_ST_TYPE(def->st_info) == STT_ARM_TFUNC)
tmp |= 1;
store_ptr(where, tmp);
}
rdbg(("ABS32/GLOB_DAT %s in %s --> %p @ %p in %s",
obj->strtab + obj->symtab[symnum].st_name,
obj->path, (void *)tmp, where, defobj->path));
break;
case R_TYPE(RELATIVE): /* word32 B + A */
if (__predict_true(RELOC_ALIGNED_P(where))) {
tmp = *where + (Elf_Addr)obj->relocbase;
*where = tmp;
} else {
tmp = load_ptr(where) +
(Elf_Addr)obj->relocbase;
store_ptr(where, tmp);
}
rdbg(("RELATIVE in %s --> %p", obj->path,
(void *)tmp));
break;
case R_TYPE(COPY):
/*
* These are deferred until all other relocations have
* been done. All we do here is make sure that the
* COPY relocation is not in a shared library. They
* are allowed only in executable files.
*/
if (obj->isdynamic) {
_rtld_error(
"%s: Unexpected R_COPY relocation in shared library",
obj->path);
return -1;
}
rdbg(("COPY (avoid in main)"));
break;
#if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
case R_TYPE(TLS_DTPOFF32):
def = _rtld_find_symdef(symnum, obj, &defobj, false);
if (def == NULL)
return -1;
tmp = (Elf_Addr)(def->st_value);
if (__predict_true(RELOC_ALIGNED_P(where)))
*where = tmp;
else
store_ptr(where, tmp);
rdbg(("TLS_DTPOFF32 %s in %s --> %p",
obj->strtab + obj->symtab[symnum].st_name,
obj->path, (void *)tmp));
break;
case R_TYPE(TLS_DTPMOD32):
def = _rtld_find_symdef(symnum, obj, &defobj, false);
if (def == NULL)
return -1;
tmp = (Elf_Addr)(defobj->tlsindex);
if (__predict_true(RELOC_ALIGNED_P(where)))
*where = tmp;
else
store_ptr(where, tmp);
rdbg(("TLS_DTPMOD32 %s in %s --> %p",
obj->strtab + obj->symtab[symnum].st_name,
obj->path, (void *)tmp));
break;
case R_TYPE(TLS_TPOFF32):
def = _rtld_find_symdef(symnum, obj, &defobj, false);
if (def == NULL)
return -1;
if (!defobj->tls_done &&
_rtld_tls_offset_allocate(obj))
return -1;
tmp = (Elf_Addr)def->st_value + defobj->tlsoffset +
sizeof(struct tls_tcb);
if (__predict_true(RELOC_ALIGNED_P(where)))
*where = tmp;
else
store_ptr(where, tmp);
rdbg(("TLS_TPOFF32 %s in %s --> %p",
obj->strtab + obj->symtab[symnum].st_name,
obj->path, (void *)tmp));
break;
#endif
default:
rdbg(("sym = %lu, type = %lu, offset = %p, "
"contents = %p, symbol = %s",
symnum, (u_long)ELF_R_TYPE(rel->r_info),
(void *)rel->r_offset, (void *)load_ptr(where),
obj->strtab + obj->symtab[symnum].st_name));
_rtld_error("%s: Unsupported relocation type %ld "
"in non-PLT relocations",
obj->path, (u_long) ELF_R_TYPE(rel->r_info));
return -1;
}
}
return 0;
}
int
_rtld_relocate_nonplt_objects(Obj_Entry *obj)
{
const Elf_Rel *rel;
Elf_Addr *got = obj->pltgot;
const Elf_Sym *sym, *def;
const Obj_Entry *defobj;
Elf_Word i;
#ifdef SUPPORT_OLD_BROKEN_LD
int broken;
#endif
#ifdef SUPPORT_OLD_BROKEN_LD
broken = 0;
sym = obj->symtab;
for (i = 1; i < 12; i++)
if (sym[i].st_info == ELF_ST_INFO(STB_LOCAL, STT_NOTYPE))
broken = 1;
dbg(("%s: broken=%d", obj->path, broken));
#endif
i = (got[1] & 0x80000000) ? 2 : 1;
/* Relocate the local GOT entries */
got += i;
for (; i < obj->local_gotno; i++)
*got++ += (Elf_Addr)obj->relocbase;
sym = obj->symtab + obj->gotsym;
/* Now do the global GOT entries */
for (i = obj->gotsym; i < obj->symtabno; i++) {
rdbg((" doing got %d sym %p (%s, %lx)", i - obj->gotsym, sym,
sym->st_name + obj->strtab, (u_long) *got));
#ifdef SUPPORT_OLD_BROKEN_LD
if (ELF_ST_TYPE(sym->st_info) == STT_FUNC &&
broken && sym->st_shndx == SHN_UNDEF) {
/*
* XXX DANGER WILL ROBINSON!
* You might think this is stupid, as it intentionally
* defeats lazy binding -- and you'd be right.
* Unfortunately, for lazy binding to work right, we
* need to a way to force the GOT slots used for
* function pointers to be resolved immediately. This
* is supposed to be done automatically by the linker,
* by not outputting a PLT slot and setting st_value
* to 0 if there are non-PLT references, but older
* versions of GNU ld do not do this.
*/
def = _rtld_find_symdef(i, obj, &defobj, false);
if (def == NULL)
return -1;
*got = def->st_value + (Elf_Addr)defobj->relocbase;
} else
#endif
if (ELF_ST_TYPE(sym->st_info) == STT_FUNC &&
sym->st_value != 0 && sym->st_shndx == SHN_UNDEF) {
/*
* If there are non-PLT references to the function,
* st_value should be 0, forcing us to resolve the
* address immediately.
*
* XXX DANGER WILL ROBINSON!
* The linker is not outputting PLT slots for calls to
* functions that are defined in the same shared
* library. This is a bug, because it can screw up
* link ordering rules if the symbol is defined in
* more than one module. For now, if there is a
* definition, we fail the test above and force a full
* symbol lookup. This means that all intra-module
* calls are bound immediately. - mycroft, 2003/09/24
*/
*got = sym->st_value + (Elf_Addr)obj->relocbase;
} else if (sym->st_info == ELF_ST_INFO(STB_GLOBAL, STT_SECTION)) {
/* Symbols with index SHN_ABS are not relocated. */
if (sym->st_shndx != SHN_ABS)
*got = sym->st_value +
(Elf_Addr)obj->relocbase;
} else {
def = _rtld_find_symdef(i, obj, &defobj, false);
if (def == NULL)
return -1;
*got = def->st_value + (Elf_Addr)defobj->relocbase;
}
rdbg((" --> now %lx", (u_long) *got));
++sym;
++got;
}
got = obj->pltgot;
for (rel = obj->rel; rel < obj->rellim; rel++) {
Elf_Word r_symndx, r_type;
void *where;
where = obj->relocbase + rel->r_offset;
r_symndx = ELF_R_SYM(rel->r_info);
r_type = ELF_R_TYPE(rel->r_info);
switch (r_type & 0xff) {
case R_TYPE(NONE):
break;
case R_TYPE(REL32): {
/* 32-bit PC-relative reference */
const size_t rlen =
ELF_R_NXTTYPE_64_P(r_type)
? sizeof(Elf_Sxword)
: sizeof(Elf_Sword);
Elf_Sxword old = load_ptr(where, rlen);
Elf_Sxword val = old;
def = obj->symtab + r_symndx;
if (r_symndx >= obj->gotsym) {
val += got[obj->local_gotno + r_symndx - obj->gotsym];
rdbg(("REL32/G(%p) %p --> %p (%s) in %s",
where, (void *)old, (void *)val,
obj->strtab + def->st_name,
obj->path));
} else {
/*
* XXX: ABI DIFFERENCE!
*
* Old NetBSD binutils would generate shared
* libs with section-relative relocations being
* already adjusted for the start address of
* the section.
*
* New binutils, OTOH, generate shared libs
* with the same relocations being based at
* zero, so we need to add in the start address
* of the section.
*
* --rkb, Oct 6, 2001
*/
if (def->st_info ==
ELF_ST_INFO(STB_LOCAL, STT_SECTION)
#ifdef SUPPORT_OLD_BROKEN_LD
&& !broken
#endif
)
val += (Elf_Addr)def->st_value;
val += (Elf_Addr)obj->relocbase;
rdbg(("REL32/L(%p) %p -> %p (%s) in %s",
where, (void *)old, (void *)val,
obj->strtab + def->st_name, obj->path));
}
store_ptr(where, val, rlen);
break;
}
#if ELFSIZE == 64
case R_TYPE(TLS_DTPMOD64):
#else
case R_TYPE(TLS_DTPMOD32):
#endif
{
Elf_Addr old = load_ptr(where, ELFSIZE / 8);
Elf_Addr val = old;
def = _rtld_find_symdef(r_symndx, obj, &defobj, false);
if (def == NULL)
return -1;
val += (Elf_Addr)defobj->tlsindex;
store_ptr(where, val, ELFSIZE / 8);
rdbg(("DTPMOD %s in %s --> %p in %s",
obj->strtab + obj->symtab[r_symndx].st_name,
obj->path, (void *)old, defobj->path));
break;
}
#if ELFSIZE == 64
case R_TYPE(TLS_DTPREL64):
#else
case R_TYPE(TLS_DTPREL32):
#endif
{
Elf_Addr old = load_ptr(where, ELFSIZE / 8);
Elf_Addr val = old;
def = _rtld_find_symdef(r_symndx, obj, &defobj, false);
if (def == NULL)
return -1;
if (!defobj->tls_done && _rtld_tls_offset_allocate(obj))
return -1;
val += (Elf_Addr)def->st_value - TLS_DTV_OFFSET;
store_ptr(where, val, ELFSIZE / 8);
rdbg(("DTPREL %s in %s --> %p in %s",
obj->strtab + obj->symtab[r_symndx].st_name,
obj->path, (void *)old, defobj->path));
break;
}
#if ELFSIZE == 64
case R_TYPE(TLS_TPREL64):
#else
case R_TYPE(TLS_TPREL32):
#endif
{
Elf_Addr old = load_ptr(where, ELFSIZE / 8);
Elf_Addr val = old;
def = _rtld_find_symdef(r_symndx, obj, &defobj, false);
if (def == NULL)
return -1;
if (!defobj->tls_done && _rtld_tls_offset_allocate(obj))
return -1;
val += (Elf_Addr)(def->st_value + defobj->tlsoffset
- TLS_TP_OFFSET);
store_ptr(where, val, ELFSIZE / 8);
rdbg(("TPREL %s in %s --> %p in %s",
obj->strtab + obj->symtab[r_symndx].st_name,
obj->path, where, defobj->path));
break;
}
default:
rdbg(("sym = %lu, type = %lu, offset = %p, "
"contents = %p, symbol = %s",
(u_long)r_symndx, (u_long)ELF_R_TYPE(rel->r_info),
(void *)rel->r_offset,
(void *)load_ptr(where, sizeof(Elf_Sword)),
obj->strtab + obj->symtab[r_symndx].st_name));
_rtld_error("%s: Unsupported relocation type %ld "
"in non-PLT relocations",
obj->path, (u_long) ELF_R_TYPE(rel->r_info));
return -1;
}
}
return 0;
}
void
_rtld_relocate_nonplt_self(Elf_Dyn *dynp, Elf_Addr relocbase)
{
const Elf_Rel *rel = 0, *rellim;
Elf_Addr relsz = 0;
void *where;
const Elf_Sym *symtab = NULL, *sym;
Elf_Addr *got = NULL;
Elf_Word local_gotno = 0, symtabno = 0, gotsym = 0;
size_t i;
for (; dynp->d_tag != DT_NULL; dynp++) {
switch (dynp->d_tag) {
case DT_REL:
rel = (const Elf_Rel *)(relocbase + dynp->d_un.d_ptr);
break;
case DT_RELSZ:
relsz = dynp->d_un.d_val;
break;
case DT_SYMTAB:
symtab = (const Elf_Sym *)(relocbase + dynp->d_un.d_ptr);
break;
case DT_PLTGOT:
got = (Elf_Addr *)(relocbase + dynp->d_un.d_ptr);
break;
case DT_MIPS_LOCAL_GOTNO:
local_gotno = dynp->d_un.d_val;
break;
case DT_MIPS_SYMTABNO:
symtabno = dynp->d_un.d_val;
break;
case DT_MIPS_GOTSYM:
gotsym = dynp->d_un.d_val;
break;
}
}
i = (got[1] & 0x80000000) ? 2 : 1;
/* Relocate the local GOT entries */
got += i;
for (; i < local_gotno; i++)
*got++ += relocbase;
sym = symtab + gotsym;
/* Now do the global GOT entries */
for (i = gotsym; i < symtabno; i++) {
*got = sym->st_value + relocbase;
++sym;
++got;
}
rellim = (const Elf_Rel *)((uintptr_t)rel + relsz);
for (; rel < rellim; rel++) {
Elf_Word r_symndx, r_type;
where = (void *)(relocbase + rel->r_offset);
r_symndx = ELF_R_SYM(rel->r_info);
r_type = ELF_R_TYPE(rel->r_info);
switch (r_type & 0xff) {
case R_TYPE(REL32): {
const size_t rlen =
ELF_R_NXTTYPE_64_P(r_type)
? sizeof(Elf_Sxword)
: sizeof(Elf_Sword);
Elf_Sxword old = load_ptr(where, rlen);
Elf_Sxword val = old;
#if ELFSIZE == 64
assert(r_type == R_TYPE(REL32)
|| r_type == (R_TYPE(REL32)|(R_TYPE(64) << 8)));
#endif
assert(r_symndx < gotsym);
sym = symtab + r_symndx;
assert(ELF_ST_BIND(sym->st_info) == STB_LOCAL);
val += relocbase;
store_ptr(where, val, sizeof(Elf_Sword));
rdbg(("REL32/L(%p) %p -> %p in <self>",
where, (void *)old, (void *)val));
store_ptr(where, val, rlen);
break;
}
case R_TYPE(GPREL32):
case R_TYPE(NONE):
break;
default:
abort();
}
}
}
