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Switched to -sectcreate instead of mmap on OS X

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This commit is contained in:
Kyle Kirbatski
2015-12-08 17:36:38 -06:00
committed by LRFLEW
parent 1456049dfb
commit af382b1884
2 changed files with 16 additions and 39 deletions
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6
CMakeLists.txt
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@@ -61,11 +61,11 @@ file(GLOB_RECURSE ORCT2_SOURCES "src/*.c" "src/*.cpp" "lib/argparse/*.c" "lib/cu
if (UNIX)
# force 32bit build for now and set necessary flags to compile code as is
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32 -std=gnu99 -fno-omit-frame-pointer")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32 -std=gnu++11 -fno-omit-frame-pointer")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32 -std=gnu99 -fno-omit-frame-pointer -fno-pie")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -m32 -std=gnu++11 -fno-omit-frame-pointer -fno-pie")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
if (APPLE)
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-image_base,0x3401000")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -sectcreate rct2_text __text /Users/kkirbatski/Desktop/openrct2_text -sectcreate rct2_data __data /Users/kkirbatski/Desktop/openrct2_data -segaddr rct2_data 0x8a4000 -segprot rct2_data rwx rwx -segaddr rct2_text 0x4010000 -segprot rct2_text rwx rwx -fno-pie -read_only_relocs suppress")
endif (APPLE)
set(CMAKE_EXE_LINKER_FLAGS ${CMAKE_SHARED_LINKER_FLAGS})
endif (UNIX)

49
src/openrct2.c
View File

@@ -60,8 +60,8 @@ bool gOpenRCT2Headless = false;
bool gOpenRCT2ShowChangelog;
#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
void *gDataSegment;
void *gTextSegment;
//unsigned char __attribute__((section ("rct2_text,__text"))) gTextSegment[0x004A3000];
//unsigned char __attribute__((section ("rct2_data,__data"))) gDataSegment[0x01429000 - 0x8a4000];
int gExeFd;
#endif // defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
@@ -472,7 +472,7 @@ static bool openrct2_setup_rct2_segment()
// POSIX OSes will run OpenRCT2 as a native application and then load in the Windows PE, mapping the appropriate addresses as
// necessary. Windows does not need to do this as OpenRCT2 runs as a DLL loaded from the Windows PE.
#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
#define RDATA_OFFSET 0x004A4000
/*#define RDATA_OFFSET 0x004A4000
#define DATASEG_OFFSET 0x005E2000
const char *exepath = "openrct2.exe";
@@ -551,19 +551,20 @@ static bool openrct2_setup_rct2_segment()
log_error("Found already mapped pages in region we want to claim. This means something accessed memory before we got to and following mmap (or next malloc) call will likely fail.");
}
// section: rw data
gDataSegment = mmap((void *)0x8a4000, len, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_ANONYMOUS | MAP_SHARED, 0, 0);
if (gDataSegment != (void *)0x8a4000) {
log_fatal("mmap failed to get required offset for data segment! got %p, expected %p, errno = %d", gDataSegment, (void *)(0x8a4000), errno);
exit(1);
void* asdf = mmap((void *)0x8a4000, len, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_ANON | MAP_SHARED, 0, 0);
if (asdf != (void *)0x8a4000) {
log_fatal("mmap failed to get required offset for data segment! got %p, expected %p, errno = %d", gDataSegment, (void *)(0x8a4000), errno);
exit(1);
}
len = 0x004A3000;
// section: text
gTextSegment = mmap((void *)(0x401000), len, PROT_EXEC | PROT_WRITE | PROT_READ, MAP_FIXED | MAP_PRIVATE, gExeFd, 0x1000);
if (gTextSegment != (void *)(0x401000))
void* ffaa = mmap((void *)(0x401000), len, PROT_EXEC | PROT_WRITE | PROT_READ, MAP_FIXED | MAP_PRIVATE, gExeFd, 0x1000);
if (ffaa != (void *)(0x401000))
{
log_fatal("mmap failed to get required offset for text segment! got %p, expected %p, errno = %d", gTextSegment, (void *)(0x401000), errno);
exit(1);
log_fatal("mmap failed to get required offset for text segment! got %p, expected %p, errno = %d", gTextSegment, (void *)(0x401000), errno);
exit(1);
}
void *fbase = mmap(NULL, file_size, PROT_READ, MAP_PRIVATE | MAP_FILE, gExeFd, 0);
@@ -584,7 +585,7 @@ static bool openrct2_setup_rct2_segment()
{
err = errno;
log_error("Failed to unmap file! errno = %d", err);
}
}*/
#endif // defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
// Check that the expected data is at various addresses.
@@ -610,30 +611,6 @@ static bool openrct2_release_rct2_segment()
{
bool result = true;
#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
int len = 0x01429000 - 0x8a4000; // 0xB85000, 12079104 bytes or around 11.5MB
int err;
err = munmap(gDataSegment, len);
if (err != 0)
{
err = errno;
log_error("Failed to unmap data segment! errno = %d", err);
result = false;
}
len = 0x004A3000;
err = munmap(gTextSegment, len);
if (err != 0)
{
err = errno;
log_error("Failed to unmap text segment! errno = %d", err);
result = false;
}
err = close(gExeFd);
if (err != 0)
{
err = errno;
log_error("Failed to close file! errno = %d", err);
result = false;
}
#endif // defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
return result;
}