+/* Cycript - Optimizing JavaScript Compiler/Runtime
+ * Copyright (C) 2009-2013 Jay Freeman (saurik)
+*/
+
+/* GNU General Public License, Version 3 {{{ */
+/*
+ * Cycript is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation, either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Cycript is distributed in the hope that 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 Cycript. If not, see <http://www.gnu.org/licenses/>.
+**/
+/* }}} */
+
#include <dlfcn.h>
+
#include <mach/mach.h>
-extern "C" {
-#include <mach-o/nlist.h>
-}
+#ifdef __APPLE__
+#include "TargetConditionals.h"
+#endif
+
+#ifdef TARGET_OS_IPHONE
+#include <mach/vm_map.h>
+#define mach_vm_allocate vm_allocate
+#define mach_vm_protect vm_protect
+#define mach_vm_write vm_write
+#define mach_vm_address_t vm_address_t
+#else
+#include <mach/mach_vm.h>
+#endif
+
+#include <mach/machine/thread_status.h>
#include <cstdio>
#include <pthread.h>
#include "Pooling.hpp"
#include "Trampoline.t.hpp"
-extern "C" void _pthread_set_self(pthread_t);
-
-template <typename Type_>
-static void nlset(Type_ &function, struct nlist *nl, size_t index) {
- struct nlist &name(nl[index]);
- uintptr_t value(name.n_value);
- if ((name.n_desc & N_ARM_THUMB_DEF) != 0)
- value |= 0x00000001;
- function = reinterpret_cast<Type_>(value);
-}
+extern "C" void CYHandleServer(pid_t);
void InjectLibrary(pid_t pid) {
- // XXX: break this into the build environment
- const char *library("/usr/lib/libcycript.dylib");
+ Dl_info addr;
+ _assert(dladdr(reinterpret_cast<void *>(&CYHandleServer), &addr) != 0);
- static const size_t Stack_(8 * 1024);
- size_t length(strlen(library) + 1), depth(sizeof(Baton) + length);
- depth = (depth + sizeof(uintptr_t) + 1) / sizeof(uintptr_t) * sizeof(uintptr_t);
-
- CYPool pool;
- uint8_t *local(reinterpret_cast<uint8_t *>(apr_palloc(pool, depth)));
- Baton *baton(reinterpret_cast<Baton *>(local));
-
- struct nlist nl[2];
- memset(nl, 0, sizeof(nl));
- nl[0].n_un.n_name = (char *) "__pthread_set_self";
- nlist("/usr/lib/libSystem.B.dylib", nl);
- nlset(baton->_pthread_set_self, nl, 0);
- _assert(baton->_pthread_set_self != NULL);
-
- baton->pthread_create = &pthread_create;
- baton->pthread_join = &pthread_join;
-
- baton->dlopen = &dlopen;
- baton->dlsym = &dlsym;
-
- baton->mach_thread_self = &mach_thread_self;
- baton->thread_terminate = &thread_terminate;
-
- baton->pid = getpid();
- memcpy(baton->library, library, length);
-
- vm_size_t size(depth + Stack_);
+ size_t flength(strlen(addr.dli_fname));
+ char library[flength + 4 + 1];
+ memcpy(library, addr.dli_fname, flength);
+ library[flength] = '\0';
+ _assert(strcmp(library + flength - 6, ".dylib") == 0);
+ strcpy(library + flength - 6, "-any.dylib");
mach_port_t self(mach_task_self()), task;
_krncall(task_for_pid(self, pid, &task));
- vm_address_t data;
- _krncall(vm_allocate(task, &data, size, true));
- vm_address_t stack(data + depth);
- vm_write(task, data, reinterpret_cast<vm_address_t>(baton), depth);
+ mach_msg_type_number_t count;
- vm_address_t code;
- _krncall(vm_allocate(task, &code, sizeof(Trampoline_), true));
- vm_write(task, code, reinterpret_cast<vm_address_t>(Trampoline_), sizeof(Trampoline_));
- _krncall(vm_protect(task, code, sizeof(Trampoline_), false, VM_PROT_READ | VM_PROT_EXECUTE));
+ task_dyld_info info;
+ count = TASK_DYLD_INFO_COUNT;
+ _krncall(task_info(task, TASK_DYLD_INFO, reinterpret_cast<task_info_t>(&info), &count));
+ _assert(count == TASK_DYLD_INFO_COUNT);
+ _assert(info.all_image_info_addr != 0);
thread_act_t thread;
_krncall(thread_create(task, &thread));
- thread_state_flavor_t flavor;
- mach_msg_type_number_t count;
-
-#if defined(__arm__)
+#if defined (__i386__) || defined(__x86_64__)
+ x86_thread_state_t state;
+#elif defined(__arm__)
arm_thread_state_t state;
- flavor = ARM_THREAD_STATE;
- count = ARM_THREAD_STATE_COUNT;
#else
#error XXX: implement
#endif
memset(&state, 0, sizeof(state));
+ mach_msg_type_number_t read(MACHINE_THREAD_STATE_COUNT);
+ _krncall(thread_get_state(thread, MACHINE_THREAD_STATE, reinterpret_cast<thread_state_t>(&state), &read));
+ _assert(read == MACHINE_THREAD_STATE_COUNT);
+
+ Trampoline *trampoline;
+ size_t align;
+ size_t push;
+
+#if defined(__i386__) || defined(__x86_64__)
+ switch (state.tsh.flavor) {
+ case i386_THREAD_STATE:
+ trampoline = &Trampoline_i386_;
+ align = 4;
+ push = 5;
+ break;
+ case x86_THREAD_STATE64:
+ trampoline = &Trampoline_x86_64_;
+ align = 8;
+ push = 2;
+ break;
+ default:
+ _assert(false);
+ }
+#elif defined(__arm__)
+ trampoline = &Trampoline_armv6_;
+ align = 4;
+ push = 0;
+#else
+ #error XXX: implement
+#endif
- mach_msg_type_number_t read(count);
- _krncall(thread_get_state(thread, flavor, reinterpret_cast<thread_state_t>(&state), &read));
- _assert(count == count);
+ static const size_t Stack_(8 * 1024);
+ size_t length(strlen(library) + 1), depth(sizeof(Baton) + length);
+ depth = (depth + align + 1) / align * align;
-#if defined(__arm__)
- state.r[0] = data;
- state.r[1] = RTLD_LAZY | RTLD_GLOBAL;
- state.sp = stack + Stack_;
- state.pc = code;
+ CYPool pool;
+ uint8_t *local(pool.malloc<uint8_t>(depth));
+ Baton *baton(reinterpret_cast<Baton *>(local));
- if ((state.pc & 0x1) != 0) {
- state.pc &= ~0x1;
- state.cpsr |= 0x20;
+ baton->dyld = info.all_image_info_addr;
+ baton->pid = getpid();
+ memcpy(baton->library, library, length);
+
+ mach_vm_size_t size(depth + Stack_);
+ mach_vm_address_t stack;
+ _krncall(mach_vm_allocate(task, &stack, size, true));
+
+ mach_vm_address_t data(stack + Stack_);
+ _krncall(mach_vm_write(task, data, reinterpret_cast<mach_vm_address_t>(baton), depth));
+
+ mach_vm_address_t code;
+ _krncall(mach_vm_allocate(task, &code, trampoline->size_, true));
+ _krncall(mach_vm_write(task, code, reinterpret_cast<mach_vm_address_t>(trampoline->data_), trampoline->size_));
+ _krncall(mach_vm_protect(task, code, trampoline->size_, false, VM_PROT_READ | VM_PROT_EXECUTE));
+
+ uint32_t frame[push];
+ if (sizeof(frame) != 0)
+ memset(frame, 0, sizeof(frame));
+
+#if defined(__i386__) || defined(__x86_64__)
+ switch (state.tsh.flavor) {
+ case i386_THREAD_STATE:
+ frame[1] = data;
+ state.uts.ts32.__eip = code + trampoline->entry_;
+ state.uts.ts32.__esp = stack + Stack_ - sizeof(frame);
+ break;
+ case x86_THREAD_STATE64:
+ state.uts.ts64.__rdi = data;
+ state.uts.ts64.__rip = code + trampoline->entry_;
+ state.uts.ts64.__rsp = stack + Stack_ - sizeof(frame);
+ break;
+ default:
+ _assert(false);
+ }
+#elif defined(__arm__)
+ state.__r[0] = data;
+ state.__pc = code + trampoline->entry_;
+ state.__sp = stack + Stack_ - sizeof(frame);
+
+ if ((state.__pc & 0x1) != 0) {
+ state.__pc &= ~0x1;
+ state.__cpsr |= 0x20;
}
#else
#error XXX: implement
#endif
- _krncall(thread_set_state(thread, flavor, reinterpret_cast<thread_state_t>(&state), count));
+ if (sizeof(frame) != 0)
+ _krncall(mach_vm_write(task, stack + Stack_ - sizeof(frame), reinterpret_cast<mach_vm_address_t>(frame), sizeof(frame)));
+
+ _krncall(thread_set_state(thread, MACHINE_THREAD_STATE, reinterpret_cast<thread_state_t>(&state), MACHINE_THREAD_STATE_COUNT));
_krncall(thread_resume(thread));
_krncall(mach_port_deallocate(self, task));
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