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objc.cc
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/*
* Copyright (c) YungRaj
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "objc.h"
#include "macho.h"
#include "macho_userspace.h"
#include "pac.h"
#include <assert.h>
#include <string.h>
namespace objc {
ObjCData* ParseObjectiveC(darwin::MachOUserspace* macho) {
return new ObjCData(macho);
}
void ParseClassList(ObjCData* data, std::vector<ObjCClass*>& classes) {
darwin::MachOUserspace* macho = data->GetMachO();
Section* classlist = data->GetClassList();
Section* classrefs = data->GetClassRefs();
Section* superrefs = data->GetSuperRefs();
Section* ivars = data->GetIvars();
Section* objc_data = data->GetObjcData();
Size classlist_size = classlist->GetSize();
UInt64 address = classlist->GetAddress();
UInt64 base = macho->GetBase() - data->GetMachO()->GetAslrSlide();
UInt64 header = reinterpret_cast<UInt64>(macho->GetMachHeader());
UInt64* clslist = reinterpret_cast<UInt64*>(header + classlist->GetOffset());
for (UInt64 off = 0; off < classlist_size; off = off + sizeof(UInt64)) {
ObjCClass* c;
ObjCClass* metac;
UInt64 cls = macho->GetBufferAddress(((*(clslist + off / sizeof(UInt64))) & 0xFFFFFFFFFFF) -
macho->GetAslrSlide());
if (!cls) {
cls = header + *(clslist + off / sizeof(UInt64)) & 0xFFFFFFFFFFF;
}
struct _objc_2_class* objc_class = reinterpret_cast<struct _objc_2_class*>(cls);
if (objc_class) {
c = new ObjCClass(data, objc_class, false);
if (c->IsValid()) {
classes.push_back(c);
}
}
struct _objc_2_class* objc_metaclass =
reinterpret_cast<struct _objc_2_class*>((objc_class->isa & 0xFFFFFFFF) + header);
if (objc_metaclass && objc_class != objc_metaclass) {
metac = new ObjCClass(data, objc_metaclass, true);
if (metac->IsValid()) {
classes.push_back(metac);
}
}
}
}
void ParseCategoryList(ObjCData* data, std::vector<Category*>& categories) {
darwin::MachOUserspace* macho = data->GetMachO();
Section* catlist = data->GetCategoryList();
Size catlist_size = catlist->GetSize();
UInt64 base = macho->GetBase() - data->GetMachO()->GetAslrSlide();
UInt64 header = reinterpret_cast<UInt64>(macho->GetMachHeader());
UInt64 address = catlist->GetAddress();
UInt64* categorylist = reinterpret_cast<UInt64*>(header + catlist->GetOffset());
for (UInt64 off = 0; off < catlist_size; off = off + sizeof(UInt64)) {
Category* cat;
UInt64 category = macho->GetBufferAddress(
(*(categorylist + off / sizeof(UInt64)) & 0xFFFFFFFFFFF) - macho->GetAslrSlide());
if (!category) {
category = header + (*(categorylist + off / sizeof(UInt64)) & 0xFFFFFFFFFFF);
}
struct _objc_2_category* objc_category =
reinterpret_cast<struct _objc_2_category*>(category);
if (category) {
if (!(objc_category->class_name & 0x4000000000000000)) {
cat = new Category(data, objc_category);
categories.push_back(cat);
}
}
}
}
void ParseProtocolList(ObjCData* data, std::vector<Protocol*>& protocols) {
darwin::MachOUserspace* macho = data->GetMachO();
Section* protlist = data->GetProtocolList();
Section* protrefs = data->GetProtoRefs();
Size protolist_size = protlist->GetSize();
UInt64 base = macho->GetBase() - data->GetMachO()->GetAslrSlide();
UInt64 header = reinterpret_cast<UInt64>(macho->GetMachHeader());
UInt64 address = protlist->GetAddress();
UInt64* protolist = reinterpret_cast<UInt64*>(header + protlist->GetOffset());
for (UInt64 off = 0; off < protolist_size; off = off + sizeof(UInt64)) {
Protocol* p;
UInt64 proto = macho->GetBufferAddress(
((*(protolist + off / sizeof(UInt64))) & 0xFFFFFFFFFFF) - macho->GetAslrSlide());
if (!proto) {
proto = header + *(protolist + off / sizeof(UInt64)) & 0xFFFFFFFFFFF;
}
struct _objc_2_class_protocol* objc_protocol =
reinterpret_cast<struct _objc_2_class_protocol*>(proto);
if (objc_protocol) {
p = new Protocol(data, objc_protocol);
protocols.push_back(p);
}
}
}
void ParseMethodList(ObjCData* metadata, ObjC* object, std::vector<Method*>& methodList,
enum MethodType methtype, struct _objc_2_class_method_info* methodInfo) {
darwin::MachOUserspace* macho = metadata->GetMachO();
struct _objc_2_class_method_info* methods;
Offset off;
UInt64 selectors = macho->IsDyldCache() ? objc::FindSelectorsBase(macho) : 0;
if (!methodInfo) {
return;
}
methods = reinterpret_cast<struct _objc_2_class_method_info*>(methodInfo);
off = sizeof(struct _objc_2_class_method_info);
char* type = "";
char* prefix = "";
switch (methtype) {
case INSTANCE_METHOD:
type = "Instance";
prefix = "-";
break;
case CLASS_METHOD:
type = "Class";
prefix = "+";
break;
case OPT_INSTANCE_METHOD:
type = "Optional Instance";
prefix = "-";
break;
case OPT_CLASS_METHOD:
type = "Optional Class";
prefix = "+";
break;
default:
break;
}
DARWIN_KIT_LOG("\t\t\t%s Methods\n", type);
for (int i = 0; i < methods->count; i++) {
UInt64 pointer_to_name;
UInt64 offset_to_name;
UInt8* q = reinterpret_cast<UInt8*>(reinterpret_cast<UInt8*>(methods) + off);
if (macho->IsDyldCache() && dynamic_cast<Protocol*>(object)) {
struct _objc_2_method* method = reinterpret_cast<struct _objc_2_method*>(q);
Method* meth = new Method(object, method);
DARWIN_KIT_LOG("\t\t\t\t0x%08llx: %s%s\n", meth->GetImpl(), prefix, meth->GetName());
methodList.push_back(meth);
off += sizeof(struct _objc_2_method);
continue;
} else if (macho->IsDyldCache()) {
struct _objc_2_class_method* method = reinterpret_cast<struct _objc_2_class_method*>(q);
pointer_to_name = selectors + method->name;
if (macho->GetObjectiveCLibrary()->GetBufferAddress(pointer_to_name)) {
Method* meth = new Method(object, method);
methodList.push_back(meth);
DARWIN_KIT_LOG("\t\t\t\t0x%08llx: %s%s\n", meth->GetImpl(), prefix, meth->GetName());
}
} else {
struct _objc_2_class_method* method = reinterpret_cast<struct _objc_2_class_method*>(q);
pointer_to_name = reinterpret_cast<UInt64>(macho->GetMachHeader()) +
reinterpret_cast<UInt32>(method->name & 0xFFFFFF);
offset_to_name = ((*(UInt64*)pointer_to_name) & 0xFFFFFF);
Method* meth = new Method(object, method);
methodList.push_back(meth);
DARWIN_KIT_LOG("\t\t\t\t0x%08llx: %s%s\n", meth->GetImpl(), prefix, meth->GetName());
}
off += sizeof(struct _objc_2_class_method);
}
}
void ParsePropertyList(ObjCData* metadata, ObjC* object, std::vector<Property*>& propertyList,
struct _objc_2_class_property_info* propertyInfo) {
struct _objc_2_class_property_info* properties;
Offset off;
if (!propertyInfo) {
return;
}
properties = reinterpret_cast<struct _objc_2_class_property_info*>(propertyInfo);
off = sizeof(struct _objc_2_class_property_info);
DARWIN_KIT_LOG("\t\t\tProperties\n");
for (int i = 0; i < properties->count; i++) {
struct _objc_2_class_property* property = reinterpret_cast<struct _objc_2_class_property*>(
reinterpret_cast<UInt8*>(properties) + off);
Property* prop = new Property(object, property);
propertyList.push_back(prop);
DARWIN_KIT_LOG("\t\t\t\t%s %s\n", prop->GetAttributes(), prop->GetName());
off += sizeof(struct _objc_2_class_property);
}
}
} // namespace objc
namespace objc {
ObjCClass::ObjCClass(ObjCData* metadata, struct _objc_2_class* c, bool metaclass) {
metadata = metadata;
macho = metadata->GetMachO();
metaclass = metaclass;
cls = c;
super = nullptr;
data = reinterpret_cast<struct _objc_2_class_data*>((UInt64)c->data & 0xFFFFFFF8);
if (macho->SectionForOffset(reinterpret_cast<UInt64>(data))) {
data = reinterpret_cast<struct _objc_2_class_data*>(
(UInt64)data + reinterpret_cast<UInt64>(macho->GetMachHeader()));
name = reinterpret_cast<char*>((data->name & 0xFFFFFFFF) +
reinterpret_cast<UInt64>(macho->GetMachHeader()));
if (macho->SectionForOffset(reinterpret_cast<UInt64>((data->name & 0xFFFFFFFF)))) {
if (metaclass)
printf("\t\t$OBJC_METACLASS_%s\n", name);
else
printf("\t\t$OBJC_CLASS_%s\n", name);
isa = reinterpret_cast<UInt64>(c->isa);
superclass = reinterpret_cast<UInt64>(c->superclass);
cache = reinterpret_cast<UInt64>(c->cache);
vtable = reinterpret_cast<UInt64>(c->vtable);
ParseMethods();
ParseIvars();
ParseProperties();
}
} else if (macho->SectionForAddress(reinterpret_cast<UInt64>(((UInt64)c->data & 0xFFFFFFFFF) -
macho->GetAslrSlide()))) {
data = reinterpret_cast<struct _objc_2_class_data*>(
macho->GetBufferAddress(((UInt64)c->data & 0xFFFFFFFFF) - macho->GetAslrSlide()));
name = reinterpret_cast<char*>(macho->GetBufferAddress(data->name - macho->GetAslrSlide()));
if (metaclass)
printf("\t\t$OBJC_METACLASS_%s\n", name);
else
printf("\t\t$OBJC_CLASS_%s\n", name);
isa = reinterpret_cast<UInt64>(c->isa);
superclass = reinterpret_cast<UInt64>(c->superclass);
cache = reinterpret_cast<UInt64>(c->cache);
vtable = reinterpret_cast<UInt64>(c->vtable);
ParseMethods();
ParseIvars();
ParseProperties();
} else {
name = nullptr;
data = nullptr;
isa = 0;
superclass = 0;
vtable = 0;
cache = 0;
}
}
Protocol::Protocol(ObjCData* data, struct _objc_2_class_protocol* prot) {
darwin::MachOUserspace* macho;
struct _objc_2_class_method_info* instanceMethods;
struct _objc_2_class_method_info* classMethods;
struct _objc_2_class_method_info* optionalInstanceMethods;
struct _objc_2_class_method_info* optionalClassMethods;
struct _objc_2_class_property_info* instanceProperties;
metadata = data;
protocol = prot;
macho = metadata->GetMachO();
if (macho->IsDyldCache()) {
name = reinterpret_cast<char*>(macho->GetBufferAddress(prot->name - macho->GetAslrSlide()));
printf("\t\t$OBJC_PROTOCOL_%s\n", name);
if (prot->instance_methods) {
instanceMethods = reinterpret_cast<struct _objc_2_class_method_info*>(
macho->GetBufferAddress(protocol->instance_methods - macho->GetAslrSlide()));
objc::ParseMethodList(metadata, this, GetInstanceMethods(),
INSTANCE_METHOD, instanceMethods);
}
if (prot->class_methods) {
classMethods = reinterpret_cast<struct _objc_2_class_method_info*>(
macho->GetBufferAddress(protocol->class_methods - macho->GetAslrSlide()));
objc::ParseMethodList(metadata, this, GetClassMethods(), CLASS_METHOD,
classMethods);
}
if (prot->opt_instance_methods) {
optionalInstanceMethods =
reinterpret_cast<struct _objc_2_class_method_info*>(macho->GetBufferAddress(
protocol->opt_instance_methods - macho->GetAslrSlide()));
objc::ParseMethodList(metadata, this, GetOptionalInstanceMethods(),
OPT_INSTANCE_METHOD, optionalInstanceMethods);
}
if (prot->opt_class_methods) {
optionalClassMethods = reinterpret_cast<struct _objc_2_class_method_info*>(
macho->GetBufferAddress(protocol->opt_class_methods - macho->GetAslrSlide()));
objc::ParseMethodList(metadata, this, GetOptionalClassMethods(),
OPT_CLASS_METHOD, optionalClassMethods);
}
if (prot->instance_properties) {
instanceProperties =
reinterpret_cast<struct _objc_2_class_property_info*>(macho->GetBufferAddress(
protocol->instance_properties - macho->GetAslrSlide()));
objc::ParsePropertyList(metadata, this, GetInstanceProperties(),
instanceProperties);
}
} else {
name = reinterpret_cast<char*>((prot->name & 0xFFFFFFF) +
reinterpret_cast<UInt64>(macho->GetMachHeader()));
printf("\t\t$OBJC_PROTOCOL_%s\n", name);
if (prot->instance_methods) {
instanceMethods = reinterpret_cast<struct _objc_2_class_method_info*>(
(protocol->instance_methods & 0xFFFFFFF) +
reinterpret_cast<UInt64>(macho->GetMachHeader()));
objc::ParseMethodList(metadata, this, GetInstanceMethods(),
INSTANCE_METHOD, instanceMethods);
}
if (prot->class_methods) {
classMethods = reinterpret_cast<struct _objc_2_class_method_info*>(
(protocol->class_methods & 0xFFFFFFF) +
reinterpret_cast<UInt64>(macho->GetMachHeader()));
objc::ParseMethodList(metadata, this, GetClassMethods(), CLASS_METHOD,
classMethods);
}
if (prot->opt_instance_methods) {
optionalInstanceMethods = reinterpret_cast<struct _objc_2_class_method_info*>(
(protocol->opt_instance_methods & 0xFFFFFFF) +
reinterpret_cast<UInt64>(macho->GetMachHeader()));
objc::ParseMethodList(metadata, this, GetOptionalInstanceMethods(),
OPT_INSTANCE_METHOD, optionalInstanceMethods);
}
if (prot->opt_class_methods) {
optionalClassMethods = reinterpret_cast<struct _objc_2_class_method_info*>(
(protocol->opt_class_methods & 0xFFFFFFF) +
reinterpret_cast<UInt64>(macho->GetMachHeader()));
objc::ParseMethodList(metadata, this, GetOptionalClassMethods(),
OPT_CLASS_METHOD, optionalClassMethods);
}
if (prot->instance_properties) {
instanceProperties = reinterpret_cast<struct _objc_2_class_property_info*>(
(protocol->instance_properties & 0xFFFFFFF) +
reinterpret_cast<UInt64>(macho->GetMachHeader()));
objc::ParsePropertyList(metadata, this, GetInstanceProperties(),
instanceProperties);
}
}
}
Category::Category(ObjCData* data, struct _objc_2_category* cat) {
darwin::MachOUserspace* macho = data->GetMachO();
struct _objc_2_class_method_info* instanceMethods;
struct _objc_2_class_method_info* classMethods;
struct _objc_2_class_property_info* catProperties;
metadata = data;
category = cat;
if (macho->IsDyldCache()) {
name = reinterpret_cast<char*>(
macho->GetBufferAddress(cat->category_name - macho->GetAslrSlide()));
if (!name) {
name = reinterpret_cast<char*>(macho->GetObjectiveCLibrary()->GetBufferAddress(
cat->category_name - macho->GetAslrSlide()));
}
ObjCClass* isa = data->GetClassByName(name);
if (isa) {
class_name = isa->GetName();
} else {
class_name = "UNKNOWN";
}
printf("\t\t$OBJC_CATEGORY_%s+%s\n", class_name, "extra");
if (cat->instance_methods) {
instanceMethods = reinterpret_cast<struct _objc_2_class_method_info*>(
macho->GetBufferAddress(category->instance_methods - macho->GetAslrSlide()));
objc::ParseMethodList(metadata, this, GetInstanceMethods(),
INSTANCE_METHOD, instanceMethods);
}
if (cat->class_methods) {
classMethods = reinterpret_cast<struct _objc_2_class_method_info*>(
macho->GetBufferAddress(category->class_methods - macho->GetAslrSlide()));
objc::ParseMethodList(metadata, this, GetClassMethods(), CLASS_METHOD,
classMethods);
}
if (cat->properties) {
catProperties = reinterpret_cast<struct _objc_2_class_property_info*>(
macho->GetBufferAddress(category->properties - macho->GetAslrSlide()));
objc::ParsePropertyList(metadata, this, GetProperties(),
catProperties);
}
} else {
name = reinterpret_cast<char*>((cat->category_name & 0xFFFFFFF) +
reinterpret_cast<UInt64>(macho->GetMachHeader()));
if (!(cat->class_name & 0x4000000000000000)) {
UInt64 cls =
((cat->class_name & 0xFFFFFFF) + reinterpret_cast<UInt64>(macho->GetMachHeader()));
ObjCClass* isa = data->GetClassByIsa((UInt64)cls);
if (isa) {
class_name = isa->GetName();
} else {
class_name = "UNKNOWN";
}
} else {
class_name = "UNKNOWN";
}
printf("\t\t$OBJC_CATEGORY_%s+%s\n", class_name, name);
if (cat->instance_methods) {
instanceMethods = reinterpret_cast<struct _objc_2_class_method_info*>(
(category->instance_methods & 0xFFFFFFF) +
reinterpret_cast<UInt64>(macho->GetMachHeader()));
objc::ParseMethodList(metadata, this, GetInstanceMethods(),
INSTANCE_METHOD, instanceMethods);
}
if (cat->class_methods) {
classMethods = reinterpret_cast<struct _objc_2_class_method_info*>(
(category->class_methods & 0xFFFFFFF) +
reinterpret_cast<UInt64>(macho->GetMachHeader()));
objc::ParseMethodList(metadata, this, GetClassMethods(), CLASS_METHOD,
classMethods);
}
if (cat->properties) {
catProperties = reinterpret_cast<struct _objc_2_class_property_info*>(
(category->properties & 0xFFFFFFF) +
reinterpret_cast<UInt64>(macho->GetMachHeader()));
objc::ParsePropertyList(metadata, this, GetProperties(),
catProperties);
}
}
}
Ivar::Ivar(ObjC* object, struct _objc_2_class_ivar* ivar) {
darwin::MachOUserspace* macho = object->GetMetadata()->GetMachO();
if (macho->IsDyldCache()) {
object = object;
ivar = ivar;
name = reinterpret_cast<char*>(macho->GetBufferAddress(ivar->name - macho->GetAslrSlide()));
if (!name) {
name = reinterpret_cast<char*>(macho->GetObjectiveCLibrary()->GetBufferAddress(
ivar->name - macho->GetAslrSlide()));
}
offset = ivar->offset - macho->GetAslrSlide();
type = ivar->type;
size = ivar->size;
} else {
object = object;
ivar = ivar;
offset = reinterpret_cast<UInt64>((ivar->offset & 0xFFFFFF) +
reinterpret_cast<UInt64>(macho->GetMachHeader()));
name = reinterpret_cast<char*>((ivar->name & 0xFFFFFF) +
reinterpret_cast<char*>(macho->GetMachHeader()));
type = ivar->type;
size = ivar->size;
}
}
Property::Property(ObjC* object, struct _objc_2_class_property* property) {
darwin::MachOUserspace* macho = object->GetMetadata()->GetMachO();
if (macho->IsDyldCache()) {
object = object;
property = property;
name = reinterpret_cast<char*>(
macho->GetBufferAddress(property->name - macho->GetAslrSlide()));
if (!name) {
name = reinterpret_cast<char*>(macho->GetObjectiveCLibrary()->GetBufferAddress(
property->name - macho->GetAslrSlide()));
}
attributes = reinterpret_cast<char*>(
macho->GetBufferAddress(property->attributes - macho->GetAslrSlide()));
if (!attributes) {
attributes = reinterpret_cast<char*>(macho->GetObjectiveCLibrary()->GetBufferAddress(
property->attributes - macho->GetAslrSlide()));
}
} else {
object = object;
property = property;
name = reinterpret_cast<char*>((property->name & 0xFFFFFF) +
reinterpret_cast<char*>(macho->GetMachHeader()));
attributes = reinterpret_cast<char*>((property->attributes & 0xFFFFFF) +
reinterpret_cast<char*>(macho->GetMachHeader()));
}
}
Method::Method(ObjC* object, struct _objc_2_class_method* method) {
darwin::MachOUserspace* macho = object->GetMetadata()->GetMachO();
UInt64 selectors;
UInt64 pointer_to_type;
UInt64 pointer_to_name;
object = object;
method = method;
selectors = objc::FindSelectorsBase(macho);
if (macho->IsDyldCache() && selectors) {
pointer_to_name = selectors + method->name;
pointer_to_name = macho->GetObjectiveCLibrary()->GetBufferAddress(pointer_to_name);
name = reinterpret_cast<char*>(pointer_to_name);
pointer_to_type = macho->OffsetToAddress((UInt64)&method->type -
reinterpret_cast<UInt64>(macho->GetMachHeader()));
pointer_to_type += method->type;
pointer_to_type = macho->GetBufferAddress(pointer_to_type);
if (!pointer_to_type) {
pointer_to_type = macho->GetObjectiveCLibrary()->GetBufferAddress(pointer_to_type);
}
type = pointer_to_type;
impl = reinterpret_cast<UInt64>(
method->imp + macho->OffsetToAddress(reinterpret_cast<UInt64>(&method->imp) -
reinterpret_cast<UInt64>(macho->GetMachHeader())));
} else {
if (dynamic_cast<ObjCClass*>(object) || dynamic_cast<Category*>(object)) {
pointer_to_name = reinterpret_cast<UInt64>(&method->name) +
reinterpret_cast<UInt32>(method->name & 0xFFFFFF);
pointer_to_name = reinterpret_cast<UInt64>(macho->GetMachHeader()) +
((*(UInt64*)pointer_to_name) & 0xFFFFFF);
} else {
pointer_to_name = reinterpret_cast<UInt64>(macho->GetMachHeader()) +
reinterpret_cast<UInt32>(method->name & 0xFFFFFF);
}
name = reinterpret_cast<char*>(pointer_to_name);
impl = reinterpret_cast<UInt64>((method->imp & 0xFFFFFF) +
reinterpret_cast<UInt64>(macho->GetMachHeader()));
type = method->type;
}
}
Method::Method(ObjC* object, struct _objc_2_method* method) {
darwin::MachOUserspace* macho = object->GetMetadata()->GetMachO();
object = object;
name = reinterpret_cast<char*>(macho->GetBufferAddress(method->name - macho->GetAslrSlide()));
if (!name) {
name = reinterpret_cast<char*>(
macho->GetObjectiveCLibrary()->GetBufferAddress(method->name - macho->GetAslrSlide()));
}
impl = method->imp ? method->imp - macho->GetAslrSlide() : 0;
type = macho->GetBufferAddress(method->type - macho->GetAslrSlide());
}
} // namespace objc
#ifdef __arm64__
#include <arm64/isa_arm64.h>
#include <arm64/patch_finder_arm64.h>
#elif __x86_64__
#include <x86_64/isa_x86_64.h>
#include <x86_64/patch_finder_x86_64.h>
#endif
namespace objc {
UInt64 FindSelectorsBase(darwin::MachOUserspace* macho) {
UInt64 selectors;
UInt64 method_getName;
darwin::MachOUserspace* libobjc;
Symbol* symbol;
libobjc = macho->GetObjectiveCLibrary();
if (!libobjc) {
return 0;
}
symbol = libobjc->GetSymbolByName("_method_getName");
if (!symbol) {
return 0;
}
method_getName = symbol->GetAddress();
if (!method_getName) {
return 0;
}
UInt64 start = libobjc->GetBufferAddress(method_getName);
#ifdef __arm64__
using namespace arch::arm64;
UInt64 add = arch::arm64::patchfinder::Step64(libobjc, start, 0x100,
(bool (*)(UInt32*))is_add_reg, -1, -1);
UInt64 xref = arch::arm64::patchfinder::StepBack64(libobjc, add, 0x100,
(bool (*)(UInt32*))is_adrp, -1, -1);
adr_t adrp = *reinterpret_cast<adr_t*>(xref);
add_imm_t add_imm = *reinterpret_cast<add_imm_t*>(xref + 0x4);
selectors = (xref & ~0xFFF) + ((((adrp.immhi << 2) | adrp.immlo)) << 12) +
(add_imm.sh ? (add_imm.imm << 12) : add_imm.imm);
return (selectors - start) + method_getName;
#elif __x86_64__
using namespace arch::x86_64;
cs_insn insn;
UInt64 add = arch::x86_64::patchfinder::Step64(libobjc, start, 0x100, "add", nullptr);
UInt64 mov = arch::x86_64::patchfinder::StepBack64(libobjc, add, 0x100, "mov", nullptr);
// arch::x86_64::Disassemble(mov, arch::x86_64::MaxInstruction, &insn);
// UInt64 selectors = insn.detail.x86->operands[1].mem.disp + mov;
return selectors;
#endif
}
Protocol* ObjCClass::GetProtocol(char* protocolname) {
for (int i = 0; i < GetProtocols().size(); i++) {
Protocol* protocol = GetProtocols().at(i);
if (strcmp(protocol->GetName(), protocolname) == 0) {
return protocol;
}
}
return nullptr;
}
Method* ObjCClass::GetMethod(char* methodname) {
for (int i = 0; i < GetMethods().size(); i++) {
Method* method = GetMethods().at(i);
if (strcmp(method->GetName(), methodname) == 0) {
return method;
}
}
return nullptr;
}
Ivar* ObjCClass::GetIvar(char* ivarname) {
for (int i = 0; i < GetIvars().size(); i++) {
Ivar* ivar = GetIvars().at(i);
if (strcmp(ivar->GetName(), ivarname) == 0) {
return ivar;
}
}
return nullptr;
}
Property* ObjCClass::GetProperty(char* propertyname) {
for (int i = 0; i < GetProperties().size(); i++) {
Property* property = GetProperties().at(i);
if (strcmp(property->GetName(), propertyname) == 0) {
return property;
}
}
return nullptr;
}
void ObjCClass::ParseMethods() {
struct _objc_2_class* c;
struct _objc_2_class_data* d;
struct _objc_2_class_method_info* meths;
UInt64 selectors = 0;
Offset off;
c = cls;
d = data;
if (!d->methods) {
return;
}
if (macho->IsDyldCache()) {
selectors = objc::FindSelectorsBase(macho);
}
meths = nullptr;
if (macho->IsDyldCache()) {
meths = reinterpret_cast<struct _objc_2_class_method_info*>(macho->GetBufferAddress(
(d->methods & 0xFFFFFFFFFF) - macho->GetAslrSlide()));
} else {
meths = reinterpret_cast<struct _objc_2_class_method_info*>(
(d->methods & 0xFFFFFFFFF) + reinterpret_cast<UInt64>(macho->GetMachHeader()));
}
if (!meths) {
return;
}
off = sizeof(struct _objc_2_class_method_info);
DARWIN_KIT_LOG("\t\t\tMethods\n");
for (int i = 0; i < meths->count; i++) {
struct _objc_2_class_method* method =
reinterpret_cast<struct _objc_2_class_method*>(reinterpret_cast<UInt8*>(meths) + off);
UInt64 pointer_to_name;
UInt64 offset_to_name;
if (selectors) {
pointer_to_name = selectors + method->name;
if (macho->GetObjectiveCLibrary()->GetBufferAddress(pointer_to_name)) {
Method* meth = new Method(this, method);
methods.push_back(meth);
if (metaclass) {
DARWIN_KIT_LOG("\t\t\t\t0x%08llx: +%s\n", meth->GetImpl(), meth->GetName());
} else {
DARWIN_KIT_LOG("\t\t\t\t0x%08llx: -%s\n", meth->GetImpl(), meth->GetName());
}
}
} else {
pointer_to_name = reinterpret_cast<UInt64>(&method->name) +
reinterpret_cast<UInt32>(method->name & 0xFFFFFFFF);
offset_to_name = ((*(UInt64*)pointer_to_name));
if (offset_to_name) {
Section* sect = macho->SectionForOffset(offset_to_name);
if (sect && strcmp(sect->GetSectionName(), "__objc_methname") == 0) {
Method* meth = new Method(this, method);
methods.push_back(meth);
if (metaclass) {
DARWIN_KIT_LOG("\t\t\t\t0x%08llx: +%s\n", meth->GetImpl(), meth->GetName());
} else {
DARWIN_KIT_LOG("\t\t\t\t0x%08llx: -%s\n", meth->GetImpl(), meth->GetName());
}
}
}
}
off += sizeof(struct _objc_2_class_method);
}
}
void ObjCClass::ParseProtocols() {
struct _objc_2_class* c;
struct _objc_2_class_data* d;
struct _objc_2_class_protocol_info* protocols;
Offset off;
c = cls;
d = data;
protocols = reinterpret_cast<struct _objc_2_class_protocol_info*>(data->protocols);
off = sizeof(struct _objc_2_class_protocol_info);
}
void ObjCClass::ParseIvars() {
struct _objc_2_class* c;
struct _objc_2_class_data* d;
struct _objc_2_class_ivar_info* ivs;
Offset off;
c = cls;
d = data;
if (!d->ivars) {
return;
}
ivs = nullptr;
if (macho->IsDyldCache()) {
ivs = reinterpret_cast<struct _objc_2_class_ivar_info*>(
macho->GetBufferAddress(d->ivars - macho->GetAslrSlide()));
} else {
ivs = reinterpret_cast<struct _objc_2_class_ivar_info*>(
(d->ivars & 0xFFFFFFFF) + reinterpret_cast<UInt64>(macho->GetMachHeader()));
}
if (!ivs) {
return;
}
off = sizeof(struct _objc_2_class_ivar_info);
DARWIN_KIT_LOG("\t\t\tIvars\n");
for (int i = 0; i < ivs->count; i++) {
struct _objc_2_class_ivar* ivar =
reinterpret_cast<struct _objc_2_class_ivar*>(reinterpret_cast<UInt8*>(ivs) + off);
Ivar* iv = new Ivar(this, ivar);
ivars.push_back(iv);
DARWIN_KIT_LOG("\t\t\t\t0x%08llx: %s\n", iv->GetOffset(), iv->GetName());
off += sizeof(struct _objc_2_class_ivar);
}
}
void ObjCClass::ParseProperties() {
struct _objc_2_class* c;
struct _objc_2_class_data* d;
struct _objc_2_class_property_info* props;