From e2d32cad211fa473ac20b49b172a06a479defdfd Mon Sep 17 00:00:00 2001
From: TheBrokenRail <connor24nolan@live.com>
Date: Fri, 10 May 2024 18:58:39 -0400
Subject: [PATCH] Add QEMU Patch

---
 CMakeLists.txt                     |  8 +++--
 dependencies/qemu/CMakeLists.txt   | 15 ++++++---
 dependencies/qemu/trampoline.patch | 52 ++++++++++++++++++++++++++++++
 3 files changed, 67 insertions(+), 8 deletions(-)
 create mode 100644 dependencies/qemu/trampoline.patch

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b5aceb00a..4e0ab89a31 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -152,7 +152,7 @@ if(BUILD_NATIVE_COMPONENTS)
     set(ARM_OPTIONS "${MCPI_OPTIONS}")
     list(APPEND ARM_OPTIONS "-DMCPI_BUILD_MODE:STRING=arm")
     list(APPEND ARM_OPTIONS "-DCMAKE_INSTALL_MESSAGE:STRING=NEVER")
-    list(APPEND ARM_OPTIONS "-DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>/install")
+    list(APPEND ARM_OPTIONS "-DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR>")
     if(NOT MCPI_USE_PREBUILT_ARMHF_TOOLCHAIN)
         if(DEFINED CMAKE_TOOLCHAIN_FILE)
             list(APPEND ARM_OPTIONS "-DCMAKE_TOOLCHAIN_FILE:FILEPATH=${CMAKE_TOOLCHAIN_FILE}")
@@ -166,7 +166,9 @@ if(BUILD_NATIVE_COMPONENTS)
         DOWNLOAD_COMMAND ""
         SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}"
         CMAKE_CACHE_ARGS ${ARM_OPTIONS}
-        INSTALL_COMMAND "${CMAKE_COMMAND}" "-E" "rm" "-rf" "<INSTALL_DIR>/install"
+        INSTALL_COMMAND
+            "${CMAKE_COMMAND}" "-E"
+            "rm" "-rf" "<INSTALL_DIR>/${MCPI_INSTALL_DIR}"
         COMMAND
             "${CMAKE_COMMAND}" "-E" "env"
             "DESTDIR="
@@ -178,5 +180,5 @@ if(BUILD_NATIVE_COMPONENTS)
     )
     # Install
     ExternalProject_Get_Property(arm-components INSTALL_DIR)
-    install(DIRECTORY "${INSTALL_DIR}/install/${MCPI_INSTALL_DIR}/" DESTINATION "${MCPI_INSTALL_DIR}")
+    install(DIRECTORY "${INSTALL_DIR}/${MCPI_INSTALL_DIR}/" DESTINATION "${MCPI_INSTALL_DIR}")
 endif()
diff --git a/dependencies/qemu/CMakeLists.txt b/dependencies/qemu/CMakeLists.txt
index 08f3feb6a0..c7b048f200 100644
--- a/dependencies/qemu/CMakeLists.txt
+++ b/dependencies/qemu/CMakeLists.txt
@@ -6,9 +6,9 @@ project(qemu)
 set(QEMU_VERSION "8.2.1")
 
 # Flatpak Support
-set(QEMU_PATCH "")
+set(QEMU_FLATPAK_PATCH "")
 if(MCPI_IS_FLATPAK_BUILD)
-    set(QEMU_PATCH "sed" "-i" "s/libdrm/libdrm-dis/g" "<SOURCE_DIR>/meson.build")
+    set(QEMU_FLATPAK_PATCH "sed" "-i" "s/libdrm/libdrm-dis/g" "<SOURCE_DIR>/meson.build")
 endif()
 
 # Build
@@ -19,6 +19,7 @@ if(DEFINED ENV{PKG_CONFIG_LIBDIR})
 endif()
 ExternalProject_Add(qemu
     URL "${CMAKE_CURRENT_SOURCE_DIR}/../../archives/qemu-${QEMU_VERSION}.tar.xz"
+    # Configure Build
     CONFIGURE_COMMAND
         "${CMAKE_COMMAND}" "-E" "env"
         ${PKGCONFIG_ENV}
@@ -33,12 +34,16 @@ ExternalProject_Add(qemu
         "--target-list=arm-linux-user"
         "--without-default-features"
     USES_TERMINAL_CONFIGURE TRUE
-    BUILD_COMMAND ninja "qemu-arm"
+    # Build Command
+    BUILD_COMMAND "ninja" "qemu-arm"
+    BUILD_BYPRODUCTS "<BINARY_DIR>/qemu-arm"
     USES_TERMINAL_BUILD TRUE
+    # Disable Install/Test Commands
     INSTALL_COMMAND ""
     TEST_COMMAND ""
-    PATCH_COMMAND ${QEMU_PATCH}
-    BUILD_BYPRODUCTS "<BINARY_DIR>/qemu-arm"
+    # Patch Command
+    PATCH_COMMAND "patch" "-p1" "<" "${CMAKE_CURRENT_SOURCE_DIR}/trampoline.patch"
+    COMMAND ${QEMU_FLATPAK_PATCH}
 )
 
 # Install
diff --git a/dependencies/qemu/trampoline.patch b/dependencies/qemu/trampoline.patch
new file mode 100644
index 0000000000..d4ecfb94b8
--- /dev/null
+++ b/dependencies/qemu/trampoline.patch
@@ -0,0 +1,52 @@
+--- a/linux-user/syscall.c
++++ b/linux-user/syscall.c
+@@ -17,6 +17,7 @@
+  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+  */
+ #define _ATFILE_SOURCE
++#include <dlfcn.h>
+ #include "qemu/osdep.h"
+ #include "qemu/cutils.h"
+ #include "qemu/path.h"
+@@ -9070,6 +9071,14 @@ _syscall5(int, sys_move_mount, int, __from_dfd, const char *, __from_pathname,
+            int, __to_dfd, const char *, __to_pathname, unsigned int, flag)
+ #endif
+ 
++// g2h For Trampoline
++static CPUState *_trampoline_g2h_cpu = NULL;
++static void *_trampoline_g2h(uint32_t guest_addr) {
++    return g2h(_trampoline_g2h_cpu, guest_addr);
++}
++// Trampoline Function
++typedef uint32_t (*_trampoline_t)(typeof(_trampoline_g2h) g2h, uint32_t id, uint32_t *args);
++
+ /* This is an internal helper for do_syscall so that it is easier
+  * to have a single return point, so that actions, such as logging
+  * of syscall results, can be performed.
+@@ -9095,6 +9104,26 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
+     void *p;
+ 
+     switch(num) {
++    case 0x1337: {
++        // Load Trampoline
++        static _trampoline_t _trampoline = NULL;
++        if (_trampoline == NULL) {
++            // Open Library
++            void *_trampoline_handle = dlopen("libmedia-layer-trampoline.so", RTLD_LAZY);
++            // Load Function
++            if (_trampoline_handle != NULL) {
++                _trampoline = dlsym(_trampoline_handle, "trampoline");
++            }
++        }
++        if (_trampoline == NULL) {
++            // Failed To Load
++            qemu_log_mask(LOG_UNIMP, "Unable To Load Media Layer Trampoline: %s\n", dlerror());
++            return -TARGET_ENOSYS;
++        }
++        // Call Trampoline
++        _trampoline_g2h_cpu = cpu;
++        return _trampoline(_trampoline_g2h, arg1, g2h(cpu, arg2));
++    }
+     case TARGET_NR_exit:
+         /* In old applications this may be used to implement _exit(2).
+            However in threaded applications it is used for thread termination,