From 49e976ae47b9d4bb43b102466140c4229a5ac0ca Mon Sep 17 00:00:00 2001
From: "Jay Freeman (saurik)" <saurik@saurik.com>
Date: Fri, 20 May 2011 06:58:49 +0000
Subject: [PATCH] Revert "Restructure Mach/Inject for iOS 4.3."

---
 Baton.hpp        |  9 ++++++++-
 Darwin-arm.mk    |  1 -
 Mach/Inject.cpp  | 17 +++++++++++------
 Trampoline.t.cpp | 32 ++++++++++++++++++++++----------
 4 files changed, 41 insertions(+), 18 deletions(-)

diff --git a/Baton.hpp b/Baton.hpp
index d930121..3ce4e62 100644
--- a/Baton.hpp
+++ b/Baton.hpp
@@ -24,11 +24,18 @@
 #include <sys/types.h>
 
 struct Baton {
-    void (*_pthread_start)(pthread_t, mach_port_t, void *(*)(void *), void *, size_t, unsigned int);
+    void (*__pthread_set_self)(pthread_t);
 
+    int (*pthread_create)(pthread_t *, const pthread_attr_t *, void *(*)(void *), void *);
+    int (*pthread_join)(pthread_t, void **);
+
+    void *(*dlopen)(const char *, int);
     char *(*dlerror)();
     void *(*dlsym)(void *, const char *);
 
+    mach_port_t (*mach_thread_self)();
+    kern_return_t (*thread_terminate)(thread_act_t);
+
     pid_t pid;
     char library[];
 };
diff --git a/Darwin-arm.mk b/Darwin-arm.mk
index 6c24e6e..cc97077 100644
--- a/Darwin-arm.mk
+++ b/Darwin-arm.mk
@@ -9,7 +9,6 @@ depends += apr-lib readline libffi mobilesubstrate
 library += -framework WebCore
 # XXX: all Darwin, maybe all device, should have this
 library += -lsubstrate
-console += -lsubstrate
 
 ldid := ldid -S
 entitle := ldid -Scycript.xml
diff --git a/Mach/Inject.cpp b/Mach/Inject.cpp
index 92a395e..45c33be 100644
--- a/Mach/Inject.cpp
+++ b/Mach/Inject.cpp
@@ -33,9 +33,7 @@
 #include "Pooling.hpp"
 #include "Trampoline.t.hpp"
 
-#include <substrate.h>
-
-extern "C" void _pthread_start(pthread_t, mach_port_t, void *(*)(void *), void *, size_t, unsigned int);
+extern "C" void __pthread_set_self(pthread_t);
 
 void InjectLibrary(pid_t pid) {
     const char *library(CY_LIBRARY);
@@ -48,10 +46,18 @@ void InjectLibrary(pid_t pid) {
     uint8_t *local(reinterpret_cast<uint8_t *>(apr_palloc(pool, depth)));
     Baton *baton(reinterpret_cast<Baton *>(local));
 
-    baton->_pthread_start = reinterpret_cast<void (*)(pthread_t, mach_port_t, void *(*)(void *), void *, size_t, unsigned int)>(MSFindSymbol(NULL, "__pthread_start"));
+    baton->__pthread_set_self = &__pthread_set_self;
+
+    baton->pthread_create = &pthread_create;
+    baton->pthread_join = &pthread_join;
+
+    baton->dlopen = &dlopen;
     baton->dlerror = &dlerror;
     baton->dlsym = &dlsym;
 
+    baton->mach_thread_self = &mach_thread_self;
+    baton->thread_terminate = &thread_terminate;
+
     baton->pid = getpid();
     memcpy(baton->library, library, length);
 
@@ -103,8 +109,7 @@ void InjectLibrary(pid_t pid) {
     _krncall(vm_protect(task, code, trampoline->size_, false, VM_PROT_READ | VM_PROT_EXECUTE));
 
     /*
-    printf("_pts:%p\n", baton->_pthread_start);
-    printf("dlerror:%p\n", baton->dlerror);
+    printf("_ptss:%p\n", baton->__pthread_set_self);
     printf("dlsym:%p\n", baton->dlsym);
     printf("code:%zx\n", (size_t) code);
     */
diff --git a/Trampoline.t.cpp b/Trampoline.t.cpp
index 7229c25..e52962a 100644
--- a/Trampoline.t.cpp
+++ b/Trampoline.t.cpp
@@ -35,7 +35,7 @@ static _finline void dlset(Baton *baton, Type_ &function, const char *name, void
 #define Framework(framework) \
     "/System/Library/Frameworks/" #framework ".framework/" #framework
 
-static void *Routine(void *arg) {
+void *Routine(void *arg) {
     Baton *baton(reinterpret_cast<Baton *>(arg));
 
     void *(*dlopen)(const char *, int);
@@ -64,25 +64,37 @@ static void *Routine(void *arg) {
     return NULL;
 }
 
-static void *Thread(void *arg) {
-    Baton *baton(reinterpret_cast<Baton *>(arg));
+static void $bzero(void *data, size_t size) {
+    char *bytes(reinterpret_cast<char *>(data));
+    for (size_t i(0); i != size; ++i)
+        bytes[i] = 0;
+}
+
+extern "C" void Start(Baton *baton) {
+    struct _pthread self;
+    $bzero(&self, sizeof(self));
+
+    // this code comes from _pthread_set_self
+    self.tsd[0] = &self;
+    baton->__pthread_set_self(&self);
 
     int (*pthread_create)(pthread_t *, const pthread_attr_t *, void *(*)(void *), void *);
     dlset(baton, pthread_create, "pthread_create");
 
     pthread_t thread;
-    pthread_create(&thread, NULL, &Routine, baton);
+    baton->pthread_create(&thread, NULL, &Routine, baton);
 
     int (*pthread_join)(pthread_t, void **);
     dlset(baton, pthread_join, "pthread_join");
 
     void *result;
-    pthread_join(thread, &result);
+    baton->pthread_join(thread, &result);
 
-    return NULL;
-}
+    mach_port_t (*mach_thread_self)();
+    dlset(baton, mach_thread_self, "mach_thread_self");
 
-extern "C" void Start(Baton *baton) {
-    struct _pthread self;
-    baton->_pthread_start(&self, NULL, &Thread, baton, 8 * 1024, 0);
+    kern_return_t (*thread_terminate)(thread_act_t);
+    dlset(baton, thread_terminate, "thread_terminate");
+
+    baton->thread_terminate(baton->mach_thread_self());
 }
-- 
2.49.0