mirror of
https://github.com/NohamR/RMHook.git
synced 2026-05-26 19:59:50 +00:00
Move dev hooks to separate DevHooks files
Extracted development/reverse engineering hooks and helpers from reMarkable.m into new DevHooks.h and DevHooks.m files. Updated CMakeLists.txt to include the new files and their directory. This improves code organization and maintainability for development-only instrumentation.
This commit is contained in:
√(noham)²
389
src/reMarkable/DevHooks.m
Normal file
389
src/reMarkable/DevHooks.m
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@@ -0,0 +1,389 @@
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#ifdef BUILD_MODE_DEV
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#import "DevHooks.h"
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#import "Logger.h"
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#import <Foundation/Foundation.h>
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#include <stdint.h>
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#include <string.h>
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#include <QtCore/QIODevice>
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#include <QtCore/QObject>
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// Original function pointers
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ssize_t (*original_qIODevice_write)(QIODevice *self, const char *data, int64_t maxSize) = NULL;
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int64_t (*original_qmlregister)(
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int64_t a1,
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int64_t a2,
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int64_t a3,
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int64_t a4,
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int64_t a5,
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int64_t a6,
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int a7,
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int64_t a8,
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int a9,
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int64_t a10) = NULL;
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int64_t (*original_function_at_0x100011790)(uint64_t *a1) = NULL;
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int64_t (*original_function_at_0x100011CE0)(int64_t a1, const QObject *a2, unsigned char a3, int64_t a4, QtSharedPointer::ExternalRefCountData *a5) = NULL;
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int64_t (*original_function_at_0x10015A130)(int64_t a1, int64_t a2) = NULL;
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void (*original_function_at_0x10015BC90)(int64_t a1, int64_t a2) = NULL;
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int64_t (*original_function_at_0x10016D520)(int64_t a1, int64_t *a2, unsigned int a3, int64_t a4) = NULL;
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void (*original_function_at_0x1001B6EE0)(int64_t a1, int64_t *a2, unsigned int a3) = NULL;
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#pragma mark - Helper Functions
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void logMemory(const char *label, void *address, size_t length) {
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if (!address) {
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NSLogger(@"[reMarkable] %s: (null)", label);
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return;
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}
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unsigned char *ptr = (unsigned char *)address;
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NSMutableString *hexLine = [NSMutableString stringWithFormat:@"[reMarkable] %s: ", label];
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for (size_t i = 0; i < length; i++) {
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[hexLine appendFormat:@"%02x ", ptr[i]];
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if ((i + 1) % 16 == 0 && i < length - 1) {
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NSLogger(@"%@", hexLine);
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hexLine = [NSMutableString stringWithString:@"[reMarkable] "];
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}
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}
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// Log remaining bytes if any
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if ([hexLine length] > 28) { // More than just the prefix
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NSLogger(@"%@", hexLine);
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}
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}
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void logStackTrace(const char *label) {
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NSLogger(@"[reMarkable] %s - Stack trace:", label);
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NSArray<NSString *> *callStack = [NSThread callStackSymbols];
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NSUInteger count = [callStack count];
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for (NSUInteger i = 0; i < count; i++) {
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NSString *frame = callStack[i];
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NSLogger(@"[reMarkable] #%lu: %@", (unsigned long)i, frame);
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}
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}
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#pragma mark - Hook Implementations
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extern "C" ssize_t hooked_qIODevice_write(
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QIODevice *self,
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const char *data,
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int64_t maxSize) {
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NSLogger(@"[reMarkable] QIODevice::write called with maxSize: %lld", (long long)maxSize);
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logStackTrace("QIODevice::write call stack");
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logMemory("Data to write", (void *)data, (size_t)(maxSize < 64 ? maxSize : 64));
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if (original_qIODevice_write) {
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ssize_t result = original_qIODevice_write(self, data, maxSize);
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NSLogger(@"[reMarkable] QIODevice::write result: %zd", result);
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return result;
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}
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NSLogger(@"[reMarkable] WARNING: Original QIODevice::write not available, returning 0");
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return 0;
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}
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extern "C" int64_t hooked_function_at_0x100011790(uint64_t *a1) {
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NSLogger(@"[reMarkable] Hook at 0x100011790 called!");
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NSLogger(@"[reMarkable] a1 = %p", a1);
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if (a1) {
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NSLogger(@"[reMarkable] *a1 = 0x%llx", (unsigned long long)*a1);
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logMemory("Memory at a1", (void *)a1, 64);
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logMemory("Memory at *a1", (void *)(*a1), 64);
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} else {
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NSLogger(@"[reMarkable] a1 is NULL");
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}
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if (original_function_at_0x100011790) {
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int64_t result = original_function_at_0x100011790(a1);
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NSLogger(@"[reMarkable] result = 0x%llx", (unsigned long long)result);
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return result;
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}
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NSLogger(@"[reMarkable] WARNING: Original function at 0x100011790 not available, returning 0");
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return 0;
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}
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extern "C" int64_t hooked_function_at_0x100011CE0(
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int64_t a1,
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const QObject *a2,
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unsigned char a3,
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int64_t a4,
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QtSharedPointer::ExternalRefCountData *a5) {
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// This function appears to be a QML type registration wrapper
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// It calls QQmlPrivate::qmlregister(3, ®istrationData)
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//
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// Based on IDA analysis:
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// - a1: stored at offset +0x8 in registration struct (likely type metadata ptr)
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// - a2: NOT actually a QObject* - low bits used as: ((_WORD)a2 << 8) | a3
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// This suggests a2's low 16 bits are a version/revision number
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// - a3: combined with a2 to form v17 (flags/version field)
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// - a4: stored at offset +0x18 (likely URI or type info pointer)
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// - a5: ExternalRefCountData* for shared pointer ref counting
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NSLogger(@"[reMarkable] ========================================");
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NSLogger(@"[reMarkable] Hook at 0x100011CE0 (QML Type Registration)");
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NSLogger(@"[reMarkable] ========================================");
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NSLogger(@"[reMarkable] a1 (typeMetadata?) = 0x%llx", (unsigned long long)a1);
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uint16_t a2_low = (uint16_t)(uintptr_t)a2;
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uint16_t combined_v17 = (a2_low << 8) | a3;
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NSLogger(@"[reMarkable] a2 (raw) = %p (0x%llx)", a2, (unsigned long long)(uintptr_t)a2);
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NSLogger(@"[reMarkable] a2 low 16 bits = 0x%04x (%u)", a2_low, a2_low);
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NSLogger(@"[reMarkable] a3 (flags/version) = 0x%02x (%u)", a3, a3);
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NSLogger(@"[reMarkable] v17 = (a2<<8)|a3 = 0x%04x (%u)", combined_v17, combined_v17);
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NSLogger(@"[reMarkable] a4 (typeInfo/URI?) = 0x%llx", (unsigned long long)a4);
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NSLogger(@"[reMarkable] a5 (refCountData) = %p", a5);
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if (a1) {
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logMemory("Memory at a1 (typeMetadata)", (void *)a1, 64);
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void **vtable = (void **)a1;
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NSLogger(@"[reMarkable] a1 vtable/first ptr = %p", *vtable);
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}
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if (a4) {
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logMemory("Memory at a4 (typeInfo)", (void *)a4, 64);
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const char *maybeStr = (const char *)a4;
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bool isPrintable = true;
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int len = 0;
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for (int i = 0; i < 64 && maybeStr[i]; i++) {
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if (maybeStr[i] < 0x20 || maybeStr[i] > 0x7e) {
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isPrintable = false;
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break;
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}
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len++;
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}
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if (isPrintable && len > 0) {
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NSLogger(@"[reMarkable] a4 as string: \"%.*s\"", len, maybeStr);
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}
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}
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if (a5) {
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logMemory("Memory at a5 (refCountData)", (void *)a5, 32);
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}
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logStackTrace("QML Registration context");
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if (original_function_at_0x100011CE0) {
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int64_t result = original_function_at_0x100011CE0(a1, a2, a3, a4, a5);
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NSLogger(@"[reMarkable] result (qmlregister return) = %u (0x%x)", (unsigned int)result, (unsigned int)result);
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NSLogger(@"[reMarkable] ========================================");
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return result;
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}
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NSLogger(@"[reMarkable] WARNING: Original function at 0x100011CE0 not available, returning 0");
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return 0;
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}
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extern "C" int64_t hooked_function_at_0x10015A130(int64_t a1, int64_t a2) {
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NSLogger(@"[reMarkable] Hook at 0x10015A130 called!");
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NSLogger(@"[reMarkable] a1 = 0x%llx", (unsigned long long)a1);
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NSLogger(@"[reMarkable] a2 = 0x%llx", (unsigned long long)a2);
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logMemory("Memory at a1", (void *)a1, 64);
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logMemory("Memory at a2", (void *)a2, 64);
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if (original_function_at_0x10015A130) {
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int64_t result = original_function_at_0x10015A130(a1, a2);
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NSLogger(@"[reMarkable] result = 0x%llx", (unsigned long long)result);
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return result;
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}
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NSLogger(@"[reMarkable] WARNING: Original function at 0x10015A130 not available, returning 0");
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return 0;
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}
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extern "C" void hooked_function_at_0x10015BC90(int64_t a1, int64_t a2) {
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NSLogger(@"[reMarkable] Hook at 0x10015BC90 called!");
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NSLogger(@"[reMarkable] a1 = 0x%llx", (unsigned long long)a1);
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NSLogger(@"[reMarkable] a2 = 0x%llx", (unsigned long long)a2);
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logMemory("Memory at a1", (void *)a1, 64);
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logMemory("Memory at a2", (void *)a2, 64);
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if (original_function_at_0x10015BC90) {
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original_function_at_0x10015BC90(a1, a2);
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NSLogger(@"[reMarkable] original function returned (void)");
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return;
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}
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NSLogger(@"[reMarkable] WARNING: Original function at 0x10015BC90 not available");
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}
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extern "C" int64_t hooked_function_at_0x10016D520(int64_t a1, int64_t *a2, unsigned int a3, int64_t a4) {
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NSLogger(@"[reMarkable] Hook at 0x10016D520 called!");
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NSLogger(@"[reMarkable] a1 = 0x%llx", (unsigned long long)a1);
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NSLogger(@"[reMarkable] a2 = %p", a2);
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if (a2) {
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NSLogger(@"[reMarkable] *a2 = 0x%llx", (unsigned long long)*a2);
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}
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NSLogger(@"[reMarkable] a3 = %u (0x%x)", a3, a3);
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NSLogger(@"[reMarkable] a4 = 0x%llx", (unsigned long long)a4);
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logMemory("Memory at a1", (void *)a1, 64);
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logMemory("Memory at a2", (void *)a2, 64);
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if (a2 && *a2 != 0) {
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logMemory("Memory at *a2", (void *)*a2, 64);
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}
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logMemory("Memory at a4", (void *)a4, 64);
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if (original_function_at_0x10016D520) {
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int64_t result = original_function_at_0x10016D520(a1, a2, a3, a4);
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NSLogger(@"[reMarkable] result = 0x%llx", (unsigned long long)result);
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return result;
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}
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NSLogger(@"[reMarkable] WARNING: Original function not available, returning 0");
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return 0;
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}
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extern "C" void hooked_function_at_0x1001B6EE0(int64_t a1, int64_t *a2, unsigned int a3) {
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NSLogger(@"[reMarkable] Hook at 0x1001B6EE0 called!");
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NSLogger(@"[reMarkable] a1 = 0x%llx", (unsigned long long)a1);
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// At a1 (PdfExporter object):
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// +0x10 contains a QString (likely document name)
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NSLogger(@"[reMarkable] Reading QString at a1+0x10:");
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logMemory("a1 + 0x10 (raw)", (void *)(a1 + 0x10), 64);
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void **qstrPtr = (void **)(a1 + 0x10);
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void *dataPtr = *qstrPtr;
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if (!dataPtr) {
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NSLogger(@"[reMarkable] QString has null data pointer");
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return;
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}
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// Try reading potential size fields near dataPtr
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int32_t size = 0;
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for (int delta = 4; delta <= 32; delta += 4) {
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int32_t candidate = *(int32_t *)((char *)dataPtr - delta);
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if (candidate > 0 && candidate < 10000) {
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size = candidate;
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NSLogger(@"[reMarkable] QString plausible size=%d (found at -%d)", size, delta);
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break;
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}
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}
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if (size > 0) {
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NSString *qstringValue = [[NSString alloc] initWithCharacters:(unichar *)dataPtr length:size];
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NSLogger(@"[reMarkable] QString value: \"%@\"", qstringValue);
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} else {
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NSLogger(@"[reMarkable] QString: could not find valid size");
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}
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NSLogger(@"[reMarkable] a2 = %p", a2);
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if (a2) {
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NSLogger(@"[reMarkable] *a2 = 0x%llx", (unsigned long long)*a2);
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}
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NSLogger(@"[reMarkable] a3 = %u (0x%x)", a3, a3);
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if (original_function_at_0x1001B6EE0) {
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original_function_at_0x1001B6EE0(a1, a2, a3);
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NSLogger(@"[reMarkable] Original function at 0x1001B6EE0 executed");
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} else {
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NSLogger(@"[reMarkable] WARNING: Original function not available");
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}
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}
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extern "C" int64_t hooked_qmlregister(
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int64_t a1,
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int64_t a2,
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int64_t a3,
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int64_t a4,
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int64_t a5,
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int64_t a6,
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int a7,
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int64_t a8,
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int a9,
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int64_t a10) {
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NSLogger(@"[reMarkable] ========================================");
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NSLogger(@"[reMarkable] QQmlPrivate::qmlregister called!");
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NSLogger(@"[reMarkable] ========================================");
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NSLogger(@"[reMarkable] a1 (RegistrationType) = 0x%llx (%lld)", (unsigned long long)a1, (long long)a1);
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NSLogger(@"[reMarkable] a2 = 0x%llx (%lld)", (unsigned long long)a2, (long long)a2);
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NSLogger(@"[reMarkable] a3 = 0x%llx (%lld)", (unsigned long long)a3, (long long)a3);
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NSLogger(@"[reMarkable] a4 = 0x%llx (%lld)", (unsigned long long)a4, (long long)a4);
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NSLogger(@"[reMarkable] a5 = 0x%llx (%lld)", (unsigned long long)a5, (long long)a5);
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NSLogger(@"[reMarkable] a6 = 0x%llx (%lld)", (unsigned long long)a6, (long long)a6);
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NSLogger(@"[reMarkable] a7 = 0x%x (%d)", a7, a7);
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NSLogger(@"[reMarkable] a8 = 0x%llx (%lld)", (unsigned long long)a8, (long long)a8);
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NSLogger(@"[reMarkable] a9 = 0x%x (%d)", a9, a9);
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NSLogger(@"[reMarkable] a10 = 0x%llx (%lld)", (unsigned long long)a10, (long long)a10);
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// Check for PlatformHelpers registration
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// a1 == 0 means TypeRegistration (object registration)
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// a4 must be a valid pointer (not a small integer like 0, 1, 2, etc.)
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if (a1 == 0 && a4 > 0x10000) {
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const char *typeName = (const char *)a4;
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int len = 0;
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bool isValid = true;
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for (int i = 0; i < 256; i++) {
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char c = typeName[i];
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if (c == '\0') {
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break;
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}
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if (c < 0x20 || c > 0x7e) {
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isValid = false;
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break;
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}
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len++;
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}
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if (isValid && len > 0) {
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NSLogger(@"[reMarkable] typeName (a4) = \"%.*s\"", len, typeName);
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if (len == 15 && strncmp(typeName, "PlatformHelpers", 15) == 0) {
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NSLogger(@"[reMarkable] !!! FOUND PlatformHelpers type registration !!!");
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NSLogger(@"[reMarkable] factory ptr (a2) = %p", (void *)a2);
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NSLogger(@"[reMarkable] a3 (metaObject?) = %p", (void *)a3);
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NSLogger(@"[reMarkable] a5 = %p", (void *)a5);
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NSLogger(@"[reMarkable] a6 = %p", (void *)a6);
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logMemory("Factory ptr memory", (void *)a2, 64);
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logMemory("a3 memory (metaObject?)", (void *)a3, 64);
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logStackTrace("PlatformHelpers registration");
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}
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}
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}
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// Try to interpret a2 as memory region for other registration types
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if (a2 > 0x10000 && a1 != 0) {
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logMemory("Memory at a2", (void *)a2, 64);
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const char *maybeStr = (const char *)a2;
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bool isPrintable = true;
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int len = 0;
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for (int i = 0; i < 128 && maybeStr[i]; i++) {
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if (maybeStr[i] < 0x20 || maybeStr[i] > 0x7e) {
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isPrintable = false;
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break;
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}
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len++;
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}
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if (isPrintable && len > 0) {
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NSLogger(@"[reMarkable] a2 as string: \"%.*s\"", len, maybeStr);
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}
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}
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int64_t result = 0;
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if (original_qmlregister) {
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result = original_qmlregister(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10);
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NSLogger(@"[reMarkable] result = 0x%llx (%lld)", (unsigned long long)result, (long long)result);
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} else {
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NSLogger(@"[reMarkable] WARNING: Original qmlregister not available!");
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}
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NSLogger(@"[reMarkable] ========================================");
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return result;
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}
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#endif // BUILD_MODE_DEV
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