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xboxkrnl: Initial (untested) implementation of NtProtectVirtualMemory

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Dr. Chat
2017-07-24 21:41:47 -05:00
parent a5bdeeb2da
commit aee5601c68
3 changed files with 84 additions and 7 deletions
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49
src/xenia/kernel/xboxkrnl/xboxkrnl_memory.cc
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@@ -164,6 +164,55 @@ dword_result_t NtAllocateVirtualMemory(lpdword_t base_addr_ptr,
DECLARE_XBOXKRNL_EXPORT(NtAllocateVirtualMemory,
ExportTag::kImplemented | ExportTag::kMemory);
dword_result_t NtProtectVirtualMemory(lpdword_t base_addr_ptr,
lpdword_t region_size_ptr,
dword_t protect_bits,
lpdword_t old_protect,
dword_t debug_memory) {
// Set to TRUE when this memory refers to devkit memory area.
assert_true(debug_memory == 0);
// Must request a size.
if (!base_addr_ptr || !region_size_ptr) {
return X_STATUS_INVALID_PARAMETER;
}
// Don't allow games to set execute bits.
if (protect_bits & (X_PAGE_EXECUTE | X_PAGE_EXECUTE_READ |
X_PAGE_EXECUTE_READWRITE | X_PAGE_EXECUTE_WRITECOPY)) {
XELOGW("Game setting EXECUTE bit on protect");
return X_STATUS_ACCESS_DENIED;
}
auto heap = kernel_memory()->LookupHeap(*base_addr_ptr);
// Adjust the base downwards to the nearest page boundary.
uint32_t adjusted_base =
*base_addr_ptr - (*base_addr_ptr % heap->page_size());
uint32_t adjusted_size = xe::round_up(*region_size_ptr, heap->page_size());
uint32_t protect = FromXdkProtectFlags(protect_bits);
uint32_t tmp_old_protect = 0;
// FIXME: I think it's valid for NtProtectVirtualMemory to span regions, but
// as of now our implementation will fail in this case. Need to verify.
if (!heap->Protect(adjusted_base, adjusted_size, protect, &tmp_old_protect)) {
return X_STATUS_ACCESS_DENIED;
}
// Write back output variables.
*base_addr_ptr = adjusted_base;
*region_size_ptr = adjusted_size;
if (old_protect) {
*old_protect = tmp_old_protect;
}
return X_STATUS_SUCCESS;
}
DECLARE_XBOXKRNL_EXPORT(NtProtectVirtualMemory,
ExportTag::kImplemented | ExportTag::kMemory);
dword_result_t NtFreeVirtualMemory(lpdword_t base_addr_ptr,
lpdword_t region_size_ptr, dword_t free_type,
dword_t debug_memory) {