Add Macro

CMakeLists.txt

@@ -1,13 +1,23 @@
 cmake_minimum_required(VERSION 3.17.0)
 
 # Start Project
-project(native-trampoline)
+project(trampoline)
+
+# Headers
+add_library(trampoline-headers INTERFACE)
+target_include_directories(trampoline-headers INTERFACE include)
+
+# Check Architecture
+include(CheckSymbolExists)
+check_symbol_exists("__aarch64__" "" USE_NATIVE_TRAMPOLINE)
+check_symbol_exists("__x86_64__" "" USE_QEMU_TRAMPOLINE)
 
 # Build
-add_executable(qemu-arm src/memory.cpp src/main.cpp src/trampoline.cpp src/ptrace.cpp)
-
-# Warnings
-target_compile_options(qemu-arm PRIVATE -Wall -Wextra -Werror -Wpointer-arith -Wshadow -Wnull-dereference)
-
-# Link
-target_link_libraries(qemu-arm dl)
+if(USE_NATIVE_TRAMPOLINE)
+    add_subdirectory(native)
+elseif(USE_QEMU_TRAMPOLINE)
+    add_subdirectory(qemu)
+    target_compile_definitions(trampoline-headers INTERFACE MCPI_USE_QEMU)
+else()
+    message(FATAL_ERROR "Unsupported Architecture")
+endif()

include/trampoline/types.h

@@ -0,0 +1,11 @@
+#pragma once
+
+#include <stdint.h>
+
+// Constants
+#define MAX_TRAMPOLINE_ARGS_SIZE 2097152 // 2 MiB
+#define TRAMPOLINE_SYSCALL 0x1337
+
+// Function Types
+typedef void (*trampoline_writer_t)(uint32_t guest_addr, void *data, uint32_t size);
+typedef uint32_t (*trampoline_t)(trampoline_writer_t writer, uint32_t id, const unsigned char *args);

native/CMakeLists.txt

@@ -0,0 +1,15 @@
+project(native-trampoline)
+
+# Build
+add_executable(trampoline src/memory.cpp src/main.cpp src/trampoline.cpp src/ptrace.cpp)
+
+# Warnings
+target_compile_options(trampoline PRIVATE -Wall -Wextra -Werror -Wpointer-arith -Wshadow -Wnull-dereference)
+
+# Link
+target_link_libraries(trampoline dl trampoline-headers)
+
+# Install
+function(install_trampoline bin_dir)
+    install(TARGETS trampoline DESTINATION "${bin_dir}")
+endfunction()

native/src/trampoline.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "../../minecraft-pi-reborn/media-layer/trampoline/src/common/types.h"
+#include <trampoline/types.h>
 
 #define MAX_TRAMPOLINE_ARGS_SIZE 2097152 // See media-layer/trampoline/src/guest/guest.h
 uint32_t trampoline(uint32_t id, const unsigned char *args);

qemu/CMakeLists.txt

@@ -0,0 +1,58 @@
+project(qemu)
+
+# Archive
+if(NOT DEFINED TRAMPOLINE_QEMU_ARCHIVE)
+    message(FATAL_ERROR "Missing QEMU Archive")
+endif()
+
+# Flatpak Support
+set(QEMU_FLATPAK_PATCH "")
+if(MCPI_IS_FLATPAK_BUILD)
+    set(QEMU_FLATPAK_PATCH "sed" "-i" "s/libdrm/libdrm-dis/g" "<SOURCE_DIR>/meson.build")
+endif()
+
+# Build
+include(ExternalProject)
+set(PKGCONFIG_ENV "")
+if(DEFINED ENV{PKG_CONFIG_LIBDIR})
+    set(PKGCONFIG_ENV "PKG_CONFIG_LIBDIR=$ENV{PKG_CONFIG_LIBDIR}")
+endif()
+set(EXTRA_C_FLAGS "-s -I${CMAKE_CURRENT_SOURCE_DIR}/../include")
+ExternalProject_Add(qemu
+    URL "${TRAMPOLINE_QEMU_ARCHIVE}"
+    # Configure Build
+    CONFIGURE_COMMAND
+        "${CMAKE_COMMAND}" "-E" "env"
+        ${PKGCONFIG_ENV}
+        "CFLAGS=${EXTRA_C_FLAGS}"
+        "CXXFLAGS=${EXTRA_C_FLAGS}"
+        "<SOURCE_DIR>/configure"
+        "--prefix=${CMAKE_INSTALL_PREFIX}"
+        "--cross-prefix="
+        "--cc=${CMAKE_C_COMPILER}"
+        "--cxx=${CMAKE_CXX_COMPILER}"
+        "--extra-ldflags=-ldl -Wl,-rpath=$ORIGIN/../lib/native -Wl,--disable-new-dtags"
+        "--disable-debug-info"
+        "--target-list=arm-linux-user"
+        "--without-default-features"
+    USES_TERMINAL_CONFIGURE TRUE
+    # Build Command
+    BUILD_COMMAND "ninja" "qemu-arm"
+    BUILD_BYPRODUCTS "<BINARY_DIR>/qemu-arm"
+    USES_TERMINAL_BUILD TRUE
+    # Disable Install/Test Commands
+    INSTALL_COMMAND ""
+    TEST_COMMAND ""
+    # Patch Command
+    PATCH_COMMAND "patch" "-p1" "<" "${CMAKE_CURRENT_SOURCE_DIR}/src/trampoline.patch"
+    COMMAND ${QEMU_FLATPAK_PATCH}
+)
+
+# Install
+function(install_trampoline bin_dir legal_dir)
+    ExternalProject_Get_property(qemu BINARY_DIR)
+    install(PROGRAMS "${BINARY_DIR}/qemu-arm" DESTINATION "${bin_dir}/trampoline")
+    # License
+    ExternalProject_Get_property(qemu SOURCE_DIR)
+    install(FILES "${SOURCE_DIR}/COPYING" DESTINATION "${legal_dir}/qemu")
+endfunction()

qemu/src/trampoline.patch

@@ -0,0 +1,57 @@
+--- a/linux-user/syscall.c
++++ b/linux-user/syscall.c
+@@ -17,6 +17,8 @@
+  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+  */
+ #define _ATFILE_SOURCE
++#include <dlfcn.h>
++#include <trampoline/types.h>
+ #include "qemu/osdep.h"
+ #include "qemu/cutils.h"
+ #include "qemu/path.h"
+@@ -9070,6 +9072,13 @@ _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_writer(uint32_t guest_addr, void *data, uint32_t size) {
++    void *out = g2h(_trampoline_g2h_cpu, guest_addr);
++    memcpy(out, data, size);
++}
++
+ /* 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 +9104,31 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
+     void *p;
+ 
+     switch(num) {
++    case TRAMPOLINE_SYSCALL: {
++        // Load Trampoline
++        static trampoline_t _trampoline = NULL;
++        if (_trampoline == NULL) {
++            // Open Library
++            void *_trampoline_handle = dlopen("libmedia-layer-trampoline.so", RTLD_NOW);
++            // 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;
++        	uint32_t _trampoline_id = arg1;
++        	__attribute__((unused)) uint32_t _trampoline_length = arg2;
++        	const unsigned char *_trampoline_args = g2h(cpu, arg3);
++        uint32_t _trampoline_ret = _trampoline(_trampoline_writer, _trampoline_id, _trampoline_args);
++        *(uint32_t *) _trampoline_args = _trampoline_ret;
++        return 0;
++    }
+     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,