mirror of
https://github.com/OpenRCT2/OpenRCT2
synced 2026-01-06 06:32:56 +01:00
mmap data segment to arbitrary location
This commit is contained in:
Michał Janiszewski
@@ -79,12 +79,17 @@ option(STATIC "Create a static build.")
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option(FORCE64 "Force native (x86-64) build. Do not use, for experimental purposes only.")
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option(DISABLE_OPENGL "Disable OpenGL support.")
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option(DISABLE_RCT2 "WIP: Try building without using code and data segments from vanilla.")
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option(USE_MMAP "Use mmap to try loading rct2's data segment into memory.")
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if (FORCE64)
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set(TARGET_M "-m64")
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set(OBJ_FORMAT "elf64-x86-64")
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set(LINKER_SCRIPT "ld_script_x86_64.xc")
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-error=pointer-to-int-cast -Wno-error=int-to-pointer-cast")
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if ((APPLE OR WIN32) AND NOT USE_MMAP)
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message(WARNING "Building such configuration won't work. Enabling USE_MMAP.")
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set(USE_MMAP ON)
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endif()
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else ()
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set(TARGET_M "-m32")
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set(OBJ_FORMAT "elf32-i386")
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@@ -98,6 +103,10 @@ else (DISABLE_OPENGL)
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add_definitions(-DOPENGL_NO_LINK)
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endif (DISABLE_OPENGL)
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if (USE_MMAP)
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add_definitions(-DUSE_MMAP)
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endif (USE_MMAP)
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if (DISABLE_NETWORK)
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add_definitions(-DDISABLE_NETWORK)
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else (DISABLE_NETWORK)
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@@ -146,35 +155,40 @@ if (UNIX)
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DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/openrct2.exe
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)
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add_custom_target(segfiles DEPENDS openrct2_text openrct2_data)
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if (APPLE)
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set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -sectcreate rct2_text __text ${CMAKE_CURRENT_SOURCE_DIR}/build/openrct2_text -sectcreate rct2_data __data ${CMAKE_CURRENT_SOURCE_DIR}/build/openrct2_data -segaddr rct2_data 0x8a4000 -segprot rct2_data rwx rwx -segaddr rct2_text 0x401000 -segprot rct2_text rwx rwx -segaddr __TEXT 0x2000000 -fno-pie -read_only_relocs suppress")
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else (APPLE)
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# For Linux we have to use objcopy to wrap regular binaries into a linkable
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# format. We use specific section names which are then referenced in a
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# bespoke linker script so they can be placed at predefined VMAs.
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add_custom_command(
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OUTPUT openrct2_text_section.o
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COMMAND objcopy --input binary --output ${OBJ_FORMAT} --binary-architecture i386 openrct2_text openrct2_text_section.o --rename-section .data=.rct2_text,contents,alloc,load,readonly,code
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DEPENDS segfiles
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WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
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)
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add_custom_command(
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OUTPUT openrct2_data_section.o
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COMMAND objcopy --input binary --output ${OBJ_FORMAT} --binary-architecture i386 openrct2_data openrct2_data_section.o --rename-section .data=.rct2_data,contents,alloc,load,readonly,data
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DEPENDS segfiles
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WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
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)
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add_custom_target(linkable_sections DEPENDS openrct2_text_section.o openrct2_data_section.o)
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SET_SOURCE_FILES_PROPERTIES(
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openrct2_text_section.o openrct2_data_section.o
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PROPERTIES
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EXTERNAL_OBJECT true
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GENERATED true
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)
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# can't use GLOB here, as the files don't exist yet at cmake-time
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set(RCT2_SECTIONS "${CMAKE_BINARY_DIR}/openrct2_data_section.o" "${CMAKE_BINARY_DIR}/openrct2_text_section.o")
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set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-T,\"${CMAKE_CURRENT_SOURCE_DIR}/distribution/linux/${LINKER_SCRIPT}\"")
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endif (APPLE)
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if (NOT USE_MMAP)
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if (APPLE)
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set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -sectcreate rct2_text __text ${CMAKE_CURRENT_SOURCE_DIR}/build/openrct2_text -sectcreate rct2_data __data ${CMAKE_CURRENT_SOURCE_DIR}/build/openrct2_data -segaddr rct2_data 0x8a4000 -segprot rct2_data rwx rwx -segaddr rct2_text 0x401000 -segprot rct2_text rwx rwx -segaddr __TEXT 0x2000000 -fno-pie -read_only_relocs suppress")
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else (APPLE)
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# For Linux we have to use objcopy to wrap regular binaries into a linkable
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# format. We use specific section names which are then referenced in a
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# bespoke linker script so they can be placed at predefined VMAs.
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add_custom_command(
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OUTPUT openrct2_text_section.o
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COMMAND objcopy --input binary --output ${OBJ_FORMAT} --binary-architecture i386 openrct2_text openrct2_text_section.o --rename-section .data=.rct2_text,contents,alloc,load,readonly,code
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DEPENDS segfiles
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WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
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)
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add_custom_command(
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OUTPUT openrct2_data_section.o
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COMMAND objcopy --input binary --output ${OBJ_FORMAT} --binary-architecture i386 openrct2_data openrct2_data_section.o --rename-section .data=.rct2_data,contents,alloc,load,readonly,data
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DEPENDS segfiles
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WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
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)
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add_custom_target(linkable_sections DEPENDS openrct2_text_section.o openrct2_data_section.o)
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SET_SOURCE_FILES_PROPERTIES(
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openrct2_text_section.o openrct2_data_section.o
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PROPERTIES
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EXTERNAL_OBJECT true
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GENERATED true
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)
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# can't use GLOB here, as the files don't exist yet at cmake-time
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set(RCT2_SECTIONS "${CMAKE_BINARY_DIR}/openrct2_data_section.o" "${CMAKE_BINARY_DIR}/openrct2_text_section.o")
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set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-T,\"${CMAKE_CURRENT_SOURCE_DIR}/distribution/linux/${LINKER_SCRIPT}\"")
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endif (APPLE)
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endif (NOT USE_MMAP)
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elseif (USE_MMAP)
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# No dd here, can't extract data segment
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message(WARNING "Sorry, your platform is not supported, you have to extract data segment manually")
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endif (UNIX)
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set(DEBUG_LEVEL 0 CACHE STRING "Select debug level for compilation. Use value in range 0–3.")
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set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DDEBUG=${DEBUG_LEVEL}")
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@@ -268,7 +282,11 @@ endif (NOT DISABLE_RCT2)
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if (WIN32)
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# build as library for now, replace with add_executable
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add_library(${PROJECT} SHARED ${ORCT2_SOURCES} ${SPEEX_SOURCES})
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if (USE_MMAP)
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add_executable(${PROJECT} ${ORCT2_SOURCES} ${SPEEX_SOURCES})
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else ()
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add_library(${PROJECT} SHARED ${ORCT2_SOURCES} ${SPEEX_SOURCES})
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endif ()
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else (WIN32)
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add_executable(${PROJECT} ${ORCT2_SOURCES} ${ORCT2_MM_SOURCES} ${RCT2_SECTIONS})
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add_dependencies(${PROJECT} segfiles)
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@@ -23,8 +23,14 @@
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#pragma warning(disable : 4731)
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#endif
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#define RCT2_ADDRESS(address, type) ((type*)(address))
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#define RCT2_GLOBAL(address, type) (*((type*)(address)))
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#ifdef USE_MMAP
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#define GOOD_PLACE_FOR_DATA_SEGMENT ((uintptr_t)0x200000000)
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#else
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#define GOOD_PLACE_FOR_DATA_SEGMENT ((uintptr_t)0x8a4000)
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#endif
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#define RCT2_ADDRESS(address, type) ((type*)(GOOD_PLACE_FOR_DATA_SEGMENT - 0x8a4000 + (address)))
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#define RCT2_GLOBAL(address, type) (*((type*)(GOOD_PLACE_FOR_DATA_SEGMENT - 0x8a4000 + (address))))
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#pragma region Memory locations
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@@ -40,16 +40,18 @@
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#include "version.h"
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#include "world/mapgen.h"
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#if defined(__unix__)
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#if defined(__unix__) || defined(__MACOSX__)
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#include <sys/mman.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#endif // defined(__unix__)
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#endif // defined(__unix__) || defined(__MACOSX__)
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int gExitCode;
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int fdData;
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void *segments = (void *)(GOOD_PLACE_FOR_DATA_SEGMENT);
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int gOpenRCT2StartupAction = STARTUP_ACTION_TITLE;
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utf8 gOpenRCT2StartupActionPath[512] = { 0 };
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@@ -350,6 +352,10 @@ void openrct2_dispose()
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#ifndef DISABLE_NETWORK
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EVP_MD_CTX_destroy(gHashCTX);
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#endif // DISABLE_NETWORK
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#if defined(USE_MMAP) && (defined(__unix__) || defined(__MACOSX__))
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munmap(segments, 12079104);
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close(fdData);
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#endif
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platform_free();
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}
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@@ -499,7 +505,10 @@ bool openrct2_setup_rct2_segment()
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{
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// OpenRCT2 on Linux and macOS is wired to have the original Windows PE sections loaded
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// necessary. Windows does not need to do this as OpenRCT2 runs as a DLL loaded from the Windows PE.
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#if defined(__unix__)
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int len = 0x01429000 - 0x8a4000; // 0xB85000, 12079104 bytes or around 11.5MB
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int err;
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#if defined(USE_MMAP) && (defined(__unix__) || defined(__MACOSX__))
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#error
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#define RDATA_OFFSET 0x004A4000
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#define DATASEG_OFFSET 0x005E2000
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@@ -532,11 +541,27 @@ bool openrct2_setup_rct2_segment()
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// TODO: UGLY, UGLY HACK!
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//off_t file_size = 6750208;
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int len = 0x01429000 - 0x8a4000; // 0xB85000, 12079104 bytes or around 11.5MB
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fdData = open("openrct2_data", O_RDONLY);
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if (fdData < 0)
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{
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log_fatal("failed to load openrct2_data");
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exit(1);
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}
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log_warning("%p", GOOD_PLACE_FOR_DATA_SEGMENT);
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segments = mmap((void *)(GOOD_PLACE_FOR_DATA_SEGMENT), len, PROT_EXEC | PROT_READ | PROT_WRITE, MAP_PRIVATE, fdData, 0);
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log_warning("%p", segments);
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if ((uintptr_t)segments != GOOD_PLACE_FOR_DATA_SEGMENT) {
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perror("mmap");
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return false;
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}
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#endif // defined(USE_MMAP) && (defined(__unix__) || defined(__MACOSX__))
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#if defined(__unix__)
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int pageSize = getpagesize();
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int numPages = (len + pageSize - 1) / pageSize;
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unsigned char *dummy = malloc(numPages);
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int err = mincore((void *)0x8a4000, len, dummy);
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err = mincore((void *)0x8a4000, len, dummy);
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bool pagesMissing = false;
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if (err != 0)
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{
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@@ -569,12 +594,14 @@ bool openrct2_setup_rct2_segment()
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{
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log_error("At least one of required pages was not found in memory. This can cause segfaults later on.");
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}
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#if !defined(USE_MMAP)
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// section: text
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err = mprotect((void *)0x401000, 0x8a4000 - 0x401000, PROT_READ | PROT_EXEC);
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if (err != 0)
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{
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perror("mprotect");
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}
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#endif // !defined(USE_MMAP)
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// section: rw data
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err = mprotect((void *)0x8a4000, 0x01429000 - 0x8a4000, PROT_READ | PROT_WRITE);
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if (err != 0)
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@@ -583,12 +610,31 @@ bool openrct2_setup_rct2_segment()
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}
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#endif // defined(__unix__)
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#if !defined(NO_RCT2) || !defined(__WINDOWS__)
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#if defined(USE_MMAP) && defined(__WINDOWS__)
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#error
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segments = VirtualAlloc((void *)(GOOD_PLACE_FOR_DATA_SEGMENT), len, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
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if ((uintptr_t)segments != GOOD_PLACE_FOR_DATA_SEGMENT) {
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log_error("VirtualAlloc, segments = %p, GetLastError = 0x%x", segments, GetLastError());
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return false;
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}
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SDL_RWops * rw = SDL_RWFromFile("openrct2_data", "rb");
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if (rw == NULL)
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{
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log_error("failed to load file");
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return false;
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}
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if (SDL_RWread(rw, segments, len, 1) != 1) {
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log_error("Unable to read chunk header!");
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return false;
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}
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SDL_RWclose(rw);
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#endif // defined(USE_MMAP) && defined(__WINDOWS__)
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// Check that the expected data is at various addresses.
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// Start at 0x9a6000, which is start of .data, to skip the region containing addresses to DLL
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// calls, which can be changed by windows/wine loader.
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const uint32 c1 = sawyercoding_calculate_checksum((void *)0x009A6000, 0x009E0000 - 0x009A6000);
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const uint32 c2 = sawyercoding_calculate_checksum((void *)0x01428000, 0x014282BC - 0x01428000);
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const uint32 c1 = sawyercoding_calculate_checksum(segments + (uintptr_t)(0x009A6000 - 0x8a4000), 0x009E0000 - 0x009A6000);
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const uint32 c2 = sawyercoding_calculate_checksum(segments + (uintptr_t)(0x01428000 - 0x8a4000), 0x014282BC - 0x01428000);
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const uint32 exp_c1 = 10114815;
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const uint32 exp_c2 = 23564;
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if (c1 != exp_c1 || c2 != exp_c2) {
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@@ -596,7 +642,6 @@ bool openrct2_setup_rct2_segment()
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log_warning("c2 = %u, expected %u, match %d", c2, exp_c2, c2 == exp_c2);
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return false;
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}
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#endif
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return true;
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}
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