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Cxbx-Reloaded
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kernel: make CxbxrKrnlPrepareXbeMap function

This commit is contained in:
RadWolfie 2021-07-03 22:48:49 -05:00
parent 249d6b2169
commit 093c23d5bc
1 changed files with 84 additions and 71 deletions
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155
src/core/kernel/init/CxbxKrnl.cpp
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@ -949,6 +949,88 @@ static void CxbxrKrnlRegisterDevicePaths()
CxbxRegisterDeviceHostPath(DeviceMU7, g_MuBasePath + "M", false, sizeof(FATX_SUPERBLOCK));
}
static bool CxbxrKrnlPrepareXbeMap()
{
// Our executable DOS image header must be loaded at 0x00010000
// Assert(ExeDosHeader == XBE_IMAGE_BASE);
// Determine EXE's header locations & size :
ExeNtHeader = (PIMAGE_NT_HEADERS)((ULONG_PTR)ExeDosHeader + ExeDosHeader->e_lfanew); // = + 0x138
ExeOptionalHeader = (PIMAGE_OPTIONAL_HEADER) & (ExeNtHeader->OptionalHeader);
// verify base of code of our executable is 0x00001000
if (ExeNtHeader->OptionalHeader.BaseOfCode != CXBX_BASE_OF_CODE)
{
PopupFatal(nullptr, "Cxbx-Reloaded executuable requires it's base of code to be 0x00001000");
return false; // TODO : Halt(0);
}
#ifndef CXBXR_EMU
// verify virtual_memory_placeholder is located at 0x00011000
if ((UINT_PTR)(&(virtual_memory_placeholder[0])) != (XBE_IMAGE_BASE + CXBX_BASE_OF_CODE))
{
PopupFatal(nullptr, "virtual_memory_placeholder is not loaded to base address 0x00011000 (which is a requirement for Xbox emulation)");
return false; // TODO : Halt(0);
}
#endif
// Create a safe copy of the complete EXE header:
DWORD ExeHeaderSize = ExeOptionalHeader->SizeOfHeaders; // Should end up as 0x400
NewDosHeader = (PIMAGE_DOS_HEADER)VirtualAlloc(nullptr, ExeHeaderSize, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
if (NewDosHeader == nullptr) {
PopupFatal(nullptr, "Unable to VirtualAlloc with 0x%X size for NewDosHeader", ExeHeaderSize);
return false;
}
memcpy(NewDosHeader, ExeDosHeader, ExeHeaderSize);
// Determine NewOptionalHeader, required by RestoreExeImageHeader
NewNtHeader = (PIMAGE_NT_HEADERS)((ULONG_PTR)NewDosHeader + ExeDosHeader->e_lfanew);
NewOptionalHeader = (PIMAGE_OPTIONAL_HEADER) & (NewNtHeader->OptionalHeader);
// Make sure the new DOS header points to the new relative NtHeader location:
NewDosHeader->e_lfanew = (ULONG_PTR)NewNtHeader - XBE_IMAGE_BASE;
// Note : NewOptionalHeader->ImageBase can stay at ExeOptionalHeader->ImageBase = 0x00010000
// Note : Since virtual_memory_placeholder prevents overlap between reserved xbox memory
// and Cxbx.exe sections, section headers don't have to be patched up.
// Mark the virtual memory range completely accessible
DWORD OldProtection;
if (0 == VirtualProtect((void*)XBE_IMAGE_BASE, XBE_MAX_VA - XBE_IMAGE_BASE, PAGE_EXECUTE_READWRITE, &OldProtection)) {
DWORD err = GetLastError();
// Translate ErrorCode to String.
LPTSTR Error = 0;
if (::FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
err,
0,
(LPTSTR)&Error,
0,
NULL) == 0) {
// Failed in translating.
}
// Free the buffer.
if (Error) {
::LocalFree(Error);
Error = 0;
}
}
// Clear out the virtual memory range
memset((void*)XBE_IMAGE_BASE, 0, XBE_MAX_VA - XBE_IMAGE_BASE);
// Restore enough of the executable image headers to keep WinAPI's working :
RestoreExeImageHeader();
return true;
}
/*! initialize emulation */
static __declspec(noreturn) void CxbxrKrnlInit(
void* pTLSData,
@ -1090,77 +1172,8 @@ void CxbxKrnlEmulate(unsigned int reserved_systems, blocks_reserved_t blocks_res
}
// Now we got the arguments, start by initializing the Xbox memory map :
// PrepareXBoxMemoryMap()
{
// Our executable DOS image header must be loaded at 0x00010000
// Assert(ExeDosHeader == XBE_IMAGE_BASE);
// Determine EXE's header locations & size :
ExeNtHeader = (PIMAGE_NT_HEADERS)((ULONG_PTR)ExeDosHeader + ExeDosHeader->e_lfanew); // = + 0x138
ExeOptionalHeader = (PIMAGE_OPTIONAL_HEADER)&(ExeNtHeader->OptionalHeader);
// verify base of code of our executable is 0x00001000
if (ExeNtHeader->OptionalHeader.BaseOfCode != CXBX_BASE_OF_CODE)
{
PopupFatal(nullptr, "Cxbx-Reloaded executuable requires it's base of code to be 0x00001000");
return; // TODO : Halt(0);
}
#ifndef CXBXR_EMU
// verify virtual_memory_placeholder is located at 0x00011000
if ((UINT_PTR)(&(virtual_memory_placeholder[0])) != (XBE_IMAGE_BASE + CXBX_BASE_OF_CODE))
{
PopupFatal(nullptr, "virtual_memory_placeholder is not loaded to base address 0x00011000 (which is a requirement for Xbox emulation)");
return; // TODO : Halt(0);
}
#endif
// Create a safe copy of the complete EXE header:
DWORD ExeHeaderSize = ExeOptionalHeader->SizeOfHeaders; // Should end up as 0x400
NewDosHeader = (PIMAGE_DOS_HEADER)VirtualAlloc(nullptr, ExeHeaderSize, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
memcpy(NewDosHeader, ExeDosHeader, ExeHeaderSize);
// Determine NewOptionalHeader, required by RestoreExeImageHeader
NewNtHeader = (PIMAGE_NT_HEADERS)((ULONG_PTR)NewDosHeader + ExeDosHeader->e_lfanew);
NewOptionalHeader = (PIMAGE_OPTIONAL_HEADER)&(NewNtHeader->OptionalHeader);
// Make sure the new DOS header points to the new relative NtHeader location:
NewDosHeader->e_lfanew = (ULONG_PTR)NewNtHeader - XBE_IMAGE_BASE;
// Note : NewOptionalHeader->ImageBase can stay at ExeOptionalHeader->ImageBase = 0x00010000
// Note : Since virtual_memory_placeholder prevents overlap between reserved xbox memory
// and Cxbx.exe sections, section headers don't have to be patched up.
// Mark the virtual memory range completely accessible
DWORD OldProtection;
if (0 == VirtualProtect((void*)XBE_IMAGE_BASE, XBE_MAX_VA - XBE_IMAGE_BASE, PAGE_EXECUTE_READWRITE, &OldProtection)) {
DWORD err = GetLastError();
// Translate ErrorCode to String.
LPTSTR Error = 0;
if (::FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
err,
0,
(LPTSTR)&Error,
0,
NULL) == 0) {
// Failed in translating.
}
// Free the buffer.
if (Error) {
::LocalFree(Error);
Error = 0;
}
}
// Clear out the virtual memory range
memset((void*)XBE_IMAGE_BASE, 0, XBE_MAX_VA - XBE_IMAGE_BASE);
// Restore enough of the executable image headers to keep WinAPI's working :
RestoreExeImageHeader();
if (!CxbxrKrnlPrepareXbeMap()) {
return; // TODO : Halt(0);
}
// Load Xbox Keys from the Cxbx-Reloaded AppData directory