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LLE Mapped Buffer: Corrected behavior

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This commit is contained in:
NarcolepticK
2018-10-01 21:07:25 -04:00
parent 51d53a6281
commit 32aecd42a2
1 changed files with 30 additions and 47 deletions
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77
src/core/hle/kernel/ipc.cpp
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@@ -39,6 +39,7 @@ ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread
std::size_t dst_untranslated_size = 1u + dst_header.normal_params_size;
std::size_t dst_command_size = dst_untranslated_size + dst_header.translate_params_size;
std::size_t target_index = dst_untranslated_size;
std::array<u32, IPC::COMMAND_BUFFER_LENGTH> dst_cmd_buf;
Memory::ReadBlock(*dst_process, dst_address, dst_cmd_buf.data(),
@@ -148,54 +149,44 @@ ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread
if (reply) {
// Scan the target's command buffer for the matching mapped buffer
std::size_t j = dst_untranslated_size;
while (j < dst_command_size) {
u32 desc = dst_cmd_buf[j++];
while (target_index < dst_command_size) {
u32 desc = dst_cmd_buf[target_index++];
if (IPC::GetDescriptorType(desc) == IPC::DescriptorType::MappedBuffer) {
IPC::MappedBufferDescInfo dest_descInfo{desc};
VAddr dest_address = dst_cmd_buf[j];
VAddr dest_address = dst_cmd_buf[target_index];
u32 dest_size = static_cast<u32>(dest_descInfo.size);
IPC::MappedBufferPermissions dest_permissions = dest_descInfo.perms;
if (permissions == dest_permissions && size == dest_size) {
// Readonly buffers do not need to be copied over to the target
// process again because they were (presumably) not modified. This
// behavior is consistent with the real kernel.
if (permissions != IPC::MappedBufferPermissions::R) {
// Copy the modified buffer back into the target process
Memory::CopyBlock(*src_process, *dst_process, source_address,
dest_address, size);
}
// Unmap the Reserved page before the buffer
ResultCode result = src_process->vm_manager.UnmapRange(
page_start - Memory::PAGE_SIZE, Memory::PAGE_SIZE);
ASSERT(result == RESULT_SUCCESS);
// Unmap the buffer from the source process
result = src_process->vm_manager.UnmapRange(
page_start, num_pages * Memory::PAGE_SIZE);
ASSERT(result == RESULT_SUCCESS);
// Check if this is the last mapped buffer
VAddr next_reserve = page_start + num_pages * Memory::PAGE_SIZE;
auto& vma =
src_process->vm_manager.FindVMA(next_reserve + Memory::PAGE_SIZE)
->second;
if (vma.type == VMAType::Free) {
// Unmap the Reserved page after the last buffer
result = src_process->vm_manager.UnmapRange(next_reserve,
Memory::PAGE_SIZE);
ASSERT(result == RESULT_SUCCESS);
}
break;
ASSERT(permissions == dest_permissions && size == dest_size);
// Readonly buffers do not need to be copied over to the target
// process again because they were (presumably) not modified. This
// behavior is consistent with the real kernel.
if (permissions != IPC::MappedBufferPermissions::R) {
// Copy the modified buffer back into the target process
Memory::CopyBlock(*src_process, *dst_process, source_address,
dest_address, size);
}
VAddr prev_reserve = page_start - Memory::PAGE_SIZE;
VAddr next_reserve = page_start + num_pages * Memory::PAGE_SIZE;
auto& prev_vma = src_process->vm_manager.FindVMA(prev_reserve)->second;
auto& next_vma = src_process->vm_manager.FindVMA(next_reserve)->second;
ASSERT(prev_vma.meminfo_state == MemoryState::Reserved &&
next_vma.meminfo_state == MemoryState::Reserved);
// Unmap the buffer and guard pages from the source process
ResultCode result = src_process->vm_manager.UnmapRange(
page_start - Memory::PAGE_SIZE, (num_pages + 2) * Memory::PAGE_SIZE);
ASSERT(result == RESULT_SUCCESS);
target_index += 1;
break;
}
j += 1;
target_index += 1;
}
i += 1;
@@ -224,15 +215,7 @@ ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread
cmd_buf[i++] = target_address + page_offset;
// Check if this is the last mapped buffer
if (i < command_size) {
u32 next_descriptor = cmd_buf[i];
if (IPC::GetDescriptorType(next_descriptor) == IPC::DescriptorType::MappedBuffer) {
break;
}
}
// Reserve a page of memory after the last mapped buffer
// Reserve a page of memory after the mapped buffer
dst_process->vm_manager.MapMemoryBlockToBase(
Memory::IPC_MAPPING_VADDR, Memory::IPC_MAPPING_SIZE, reserve_buffer, 0,
static_cast<u32>(reserve_buffer->size()), Kernel::MemoryState::Reserved);