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Kernel, APT: SharedFont/SharedMemoryOnSharedDevice should always use old linear heap VAddr

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This commit is contained in:
Weiyi Wang 2018-11-04 12:11:08 -05:00
parent 1444d60109
commit 8c65433ab5
2 changed files with 15 additions and 5 deletions
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5
src/core/hle/kernel/shared_memory.cpp
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@ -142,7 +142,10 @@ ResultCode SharedMemory::Map(Process* target_process, VAddr address, MemoryPermi
if (base_address == 0 && target_address == 0) {
// Calculate the address at which to map the memory block.
target_address = linear_heap_phys_offset + target_process->GetLinearHeapAreaAddress();
// Note: even on new firmware versions, the target address is still in the old linear heap
// region. This exception is made to keep the shared font compatibility. See
// APT:GetSharedFont for detail.
target_address = linear_heap_phys_offset + Memory::LINEAR_HEAP_VADDR;
}
auto vma = target_process->vm_manager.FindVMA(target_address);

15
src/core/hle/service/apt/apt.cpp
View file

@ -207,10 +207,17 @@ void Module::Interface::GetSharedFont(Kernel::HLERequestContext& ctx) {
// The shared font has to be relocated to the new address before being passed to the
// application.
auto maybe_vaddr = Memory::PhysicalToVirtualAddress(
apt->shared_font_mem->linear_heap_phys_offset + Memory::FCRAM_PADDR);
ASSERT(maybe_vaddr);
VAddr target_address = *maybe_vaddr;
// Note: the target address is still in the old linear heap region even on new firmware
// versions. This exception is made for shared font to resolve the following compatibility
// issue:
// The linear heap region changes depending on the kernel version marked in application's
// exheader (not the actual version the application is running on). If an application with old
// kernel version and an applet with new kernel version run at the same time, and they both use
// shared font, different linear heap region would have required shared font to relocate
// according to two different addresses at the same time, which is impossible.
VAddr target_address =
apt->shared_font_mem->linear_heap_phys_offset + Memory::LINEAR_HEAP_VADDR;
if (!apt->shared_font_relocated) {
BCFNT::RelocateSharedFont(apt->shared_font_mem, target_address);
apt->shared_font_relocated = true;