From 9333373872769f3d87132ee8a32232a1b1d298d7 Mon Sep 17 00:00:00 2001
From: Gliniak <Gliniak93@gmail.com>
Date: Mon, 12 Jun 2023 07:40:52 +0200
Subject: [PATCH] [Thread] Set pointer for: stack_kernel

Based on disassembly and info from console it is used to store initial thread data like:
 - start_address, context, etc.
---
 src/xenia/kernel/xthread.cc | 1 +
 src/xenia/kernel/xthread.h  | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/src/xenia/kernel/xthread.cc b/src/xenia/kernel/xthread.cc
index 63dfc0bd8..f49645710 100644
--- a/src/xenia/kernel/xthread.cc
+++ b/src/xenia/kernel/xthread.cc
@@ -199,6 +199,7 @@ void XThread::InitializeGuestObject() {
   xe::store_and_swap<uint16_t>(p + 0x056, 1);
   xe::store_and_swap<uint32_t>(p + 0x05C, stack_base_);
   xe::store_and_swap<uint32_t>(p + 0x060, stack_limit_);
+  xe::store_and_swap<uint32_t>(p + 0x064, stack_base_ - kThreadKernelStackSize);
   xe::store_and_swap<uint32_t>(p + 0x068, tls_static_address_);
   xe::store_and_swap<uint8_t>(p + 0x06C, 0);
   xe::store_and_swap<uint32_t>(p + 0x074, guest_object() + 0x074);
diff --git a/src/xenia/kernel/xthread.h b/src/xenia/kernel/xthread.h
index 7f72a7e14..f5bac2942 100644
--- a/src/xenia/kernel/xthread.h
+++ b/src/xenia/kernel/xthread.h
@@ -166,6 +166,8 @@ class XThread : public XObject, public cpu::Thread {
   static constexpr uint32_t kStackAddressRangeBegin = 0x70000000;
   static constexpr uint32_t kStackAddressRangeEnd = 0x7F000000;
 
+  static constexpr uint32_t kThreadKernelStackSize = 0xF0;
+
   struct CreationParams {
     uint32_t stack_size;
     uint32_t xapi_thread_startup;