static __inline void
store_ptr(Elf_Addr *where, Elf_Addr val)
{
if (RELOC_ALIGNED_P(where))
*where = val;
else
memcpy(where, &val, sizeof(val));
}
static __inline Elf_Addr
load_ptr(Elf_Addr *where)
{
Elf_Addr res;
if (RELOC_ALIGNED_P(where))
return *where;
memcpy(&res, where, sizeof(res));
return (res);
}
static int
reloc_nonplt_object(Obj_Entry *obj, const Elf_Rel *rel, SymCache *cache,
RtldLockState *lockstate)
{
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_ARM_NONE:
break;
#if 1 /* XXX should not occur */
case R_ARM_PC24: { /* word32 S - P + A */
Elf32_Sword addend;
/*
* Extract addend and sign-extend if needed.
*/
addend = *where;
if (addend & 0x00800000)
addend |= 0xff000000;
def = find_symdef(symnum, obj, &defobj, false, cache,
lockstate);
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);
dbg("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_ARM_ABS32: /* word32 B + S + A */
case R_ARM_GLOB_DAT: /* word32 B + S */
def = find_symdef(symnum, obj, &defobj, false, cache,
lockstate);
if (def == NULL)
return -1;
if (__predict_true(RELOC_ALIGNED_P(where))) {
tmp = *where + (Elf_Addr)defobj->relocbase +
def->st_value;
*where = tmp;
} else {
tmp = load_ptr(where) +
(Elf_Addr)defobj->relocbase +
def->st_value;
store_ptr(where, tmp);
}
dbg("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_ARM_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);
}
dbg("RELATIVE in %s --> %p", obj->path,
(void *)tmp);
break;
case R_ARM_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->mainprog) {
_rtld_error(
"%s: Unexpected R_COPY relocation in shared library",
obj->path);
return -1;
}
dbg("COPY (avoid in main)");
break;
default:
dbg("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\n",
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;
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;
}
