Example #1
0
static __inline void
store_ptr(Elf_Addr *where, Elf_Addr val)
{
	if (RELOC_ALIGNED_P(where))
		*where = val;
	else
		memcpy(where, &val, sizeof(val));
}
Example #2
0
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);
}
Example #3
0
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;
}
Example #4
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;
}