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Core: Improve APT Shared Font hack 

Should fix invalid read loops in some games
This commit is contained in:
Yuri Kunde Schlesner 2015-08-26 03:34:31 -03:00
parent 32e279c0ca
commit 687d973980
3 changed files with 29 additions and 4 deletions
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27
src/core/hle/kernel/shared_memory.cpp
View File

@ -20,6 +20,7 @@ SharedPtr<SharedMemory> SharedMemory::Create(u32 size, MemoryPermission permissi
shared_memory->name = std::move(name);
shared_memory->base_address = 0x0;
shared_memory->fixed_address = 0x0;
shared_memory->size = size;
shared_memory->permissions = permissions;
shared_memory->other_permissions = other_permissions;
@ -30,9 +31,31 @@ SharedPtr<SharedMemory> SharedMemory::Create(u32 size, MemoryPermission permissi
ResultCode SharedMemory::Map(VAddr address, MemoryPermission permissions,
MemoryPermission other_permissions) {
if (base_address != 0) {
LOG_ERROR(Kernel, "cannot map id=%u, address=0x%08X name=%s: already mapped at 0x%08X!",
GetObjectId(), address, name.c_str(), base_address);
// TODO: Verify error code with hardware
return ResultCode(ErrorDescription::InvalidAddress, ErrorModule::Kernel,
ErrorSummary::InvalidArgument, ErrorLevel::Permanent);
}
if (fixed_address != 0) {
if (address != 0 && address != fixed_address) {
LOG_ERROR(Kernel, "cannot map id=%u, address=0x%08X name=%s: fixed_addres is 0x%08X!",
GetObjectId(), address, name.c_str(), fixed_address);
// TODO: Verify error code with hardware
return ResultCode(ErrorDescription::InvalidAddress, ErrorModule::Kernel,
ErrorSummary::InvalidArgument, ErrorLevel::Permanent);
}
// HACK(yuriks): This is only here to support the APT shared font mapping right now.
// Later, this should actually map the memory block onto the address space.
return RESULT_SUCCESS;
}
if (address < Memory::SHARED_MEMORY_VADDR || address + size >= Memory::SHARED_MEMORY_VADDR_END) {
LOG_ERROR(Kernel, "cannot map id=%u, address=0x%08X outside of shared mem bounds!",
GetObjectId(), address);
LOG_ERROR(Kernel, "cannot map id=%u, address=0x%08X name=%s outside of shared mem bounds!",
GetObjectId(), address, name.c_str());
// TODO: Verify error code with hardware
return ResultCode(ErrorDescription::InvalidAddress, ErrorModule::Kernel,
ErrorSummary::InvalidArgument, ErrorLevel::Permanent);

2
src/core/hle/kernel/shared_memory.h
View File

@ -61,6 +61,8 @@ public:
/// Address of shared memory block in the process.
VAddr base_address;
/// Fixed address to allow mapping to. Used for blocks created from the linear heap.
VAddr fixed_address;
/// Size of the memory block. Page-aligned.
u32 size;
/// Permission restrictions applied to the process which created the block.

4
src/core/hle/service/apt/apt.cpp
View File

@ -78,8 +78,8 @@ void GetSharedFont(Service::Interface* self) {
if (shared_font != nullptr) {
// TODO(yuriks): This is a hack to keep this working right now even with our completely
// broken shared memory system.
shared_font_mem->base_address = SHARED_FONT_VADDR;
Kernel::g_current_process->vm_manager.MapMemoryBlock(shared_font_mem->base_address,
shared_font_mem->fixed_address = SHARED_FONT_VADDR;
Kernel::g_current_process->vm_manager.MapMemoryBlock(shared_font_mem->fixed_address,
shared_font, 0, shared_font_mem->size, Kernel::MemoryState::Shared);
cmd_buff[0] = IPC::MakeHeader(0x44, 2, 2);