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IPC: store mapped buffer info in session context

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So that it doesn't have to scan over the request buffer again on reply. This also allow us to store additional info like memory mapping
This commit is contained in:
Weiyi Wang 2018-11-08 13:53:20 -05:00
parent 7a564b904b
commit 0b8d2ecabe
4 changed files with 59 additions and 82 deletions
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115
src/core/hle/kernel/ipc.cpp
View file

@ -2,6 +2,7 @@
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include "common/alignment.h"
#include "core/hle/ipc.h"
#include "core/hle/kernel/handle_table.h"
@ -14,70 +15,10 @@
namespace Kernel {
void ScanForAndUnmapBuffer(std::array<u32, IPC::COMMAND_BUFFER_LENGTH>& dst_cmd_buf,
const std::size_t dst_command_size, std::size_t& target_index,
SharedPtr<Process> src_process, SharedPtr<Process> dst_process,
const VAddr source_address, const VAddr page_start, const u32 num_pages,
const u32 size, const IPC::MappedBufferPermissions permissions) {
while (target_index < dst_command_size) {
u32 desc = dst_cmd_buf[target_index++];
if (IPC::GetDescriptorType(desc) == IPC::DescriptorType::CopyHandle ||
IPC::GetDescriptorType(desc) == IPC::DescriptorType::MoveHandle) {
u32 num_handles = IPC::HandleNumberFromDesc(desc);
for (u32 j = 0; j < num_handles; ++j) {
target_index += 1;
}
continue;
}
if (IPC::GetDescriptorType(desc) == IPC::DescriptorType::CallingPid ||
IPC::GetDescriptorType(desc) == IPC::DescriptorType::StaticBuffer) {
target_index += 1;
continue;
}
if (IPC::GetDescriptorType(desc) == IPC::DescriptorType::MappedBuffer) {
VAddr dest_address = dst_cmd_buf[target_index];
IPC::MappedBufferDescInfo dest_descInfo{desc};
u32 dest_size = static_cast<u32>(dest_descInfo.size);
IPC::MappedBufferPermissions dest_permissions = dest_descInfo.perms;
if (dest_size == 0) {
target_index += 1;
continue;
}
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;
}
}
}
ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread> dst_thread,
VAddr src_address, VAddr dst_address, bool reply) {
VAddr src_address, VAddr dst_address,
std::vector<MappedBufferContext>& mapped_buffer_context,
bool reply) {
auto& src_process = src_thread->owner_process;
auto& dst_process = dst_thread->owner_process;
@ -95,18 +36,6 @@ ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread
std::array<u32, IPC::COMMAND_BUFFER_LENGTH> cmd_buf;
Memory::ReadBlock(*src_process, src_address, cmd_buf.data(), command_size * sizeof(u32));
// Create a copy of the target's command buffer
IPC::Header dst_header;
Memory::ReadBlock(*dst_process, dst_address, &dst_header.raw, sizeof(dst_header.raw));
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(),
dst_command_size * sizeof(u32));
std::size_t i = untranslated_size;
while (i < command_size) {
u32 descriptor = cmd_buf[i];
@ -212,9 +141,36 @@ ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread
if (reply) {
// Scan the target's command buffer for the matching mapped buffer.
// The real kernel panics if you try to reply with an unsolicited MappedBuffer.
ScanForAndUnmapBuffer(dst_cmd_buf, dst_command_size, target_index, src_process,
dst_process, source_address, page_start, num_pages, size,
permissions);
auto found = std::find_if(
mapped_buffer_context.begin(), mapped_buffer_context.end(),
[permissions, size, source_address](const MappedBufferContext& context) {
// Note: reply's source_address is request's target_address
return context.permissions == permissions && context.size == size &&
context.target_address == source_address;
});
ASSERT(found != mapped_buffer_context.end());
if (permissions != IPC::MappedBufferPermissions::R) {
// Copy the modified buffer back into the target process
Memory::CopyBlock(*src_process, *dst_process, found->target_address,
found->source_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);
mapped_buffer_context.erase(found);
i += 1;
break;
@ -246,6 +202,9 @@ ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread
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);
mapped_buffer_context.push_back({permissions, size, source_address, target_address});
break;
}
default:

14
src/core/hle/kernel/ipc.h
View file

@ -4,11 +4,23 @@
#pragma once
#include <vector>
#include "common/common_types.h"
#include "core/hle/ipc.h"
#include "core/hle/kernel/thread.h"
namespace Kernel {
struct MappedBufferContext {
IPC::MappedBufferPermissions permissions;
u32 size;
VAddr source_address;
VAddr target_address;
};
/// Performs IPC command buffer translation from one process to another.
ResultCode TranslateCommandBuffer(SharedPtr<Thread> src_thread, SharedPtr<Thread> dst_thread,
VAddr src_address, VAddr dst_address, bool reply);
VAddr src_address, VAddr dst_address,
std::vector<MappedBufferContext>& mapped_buffer_context,
bool reply);
} // namespace Kernel

4
src/core/hle/kernel/server_session.h
View file

@ -8,6 +8,7 @@
#include <string>
#include "common/assert.h"
#include "common/common_types.h"
#include "core/hle/kernel/ipc.h"
#include "core/hle/kernel/object.h"
#include "core/hle/kernel/wait_object.h"
#include "core/hle/result.h"
@ -83,6 +84,9 @@ public:
/// TODO(Subv): Find a better name for this.
SharedPtr<Thread> currently_handling;
/// A temporary list holding mapped buffer info from IPC request, used for during IPC reply
std::vector<MappedBufferContext> mapped_buffer_context;
private:
explicit ServerSession(KernelSystem& kernel);
~ServerSession() override;

8
src/core/hle/kernel/svc.cpp
View file

@ -600,8 +600,9 @@ static ResultCode ReceiveIPCRequest(SharedPtr<ServerSession> server_session,
VAddr target_address = thread->GetCommandBufferAddress();
VAddr source_address = server_session->currently_handling->GetCommandBufferAddress();
ResultCode translation_result = TranslateCommandBuffer(
server_session->currently_handling, thread, source_address, target_address, false);
ResultCode translation_result =
TranslateCommandBuffer(server_session->currently_handling, thread, source_address,
target_address, server_session->mapped_buffer_context, false);
// If a translation error occurred, immediately resume the client thread.
if (translation_result.IsError()) {
@ -667,7 +668,8 @@ ResultCode SVC::ReplyAndReceive(s32* index, VAddr handles_address, s32 handle_co
VAddr target_address = request_thread->GetCommandBufferAddress();
ResultCode translation_result =
TranslateCommandBuffer(thread, request_thread, source_address, target_address, true);
TranslateCommandBuffer(thread, request_thread, source_address, target_address,
session->mapped_buffer_context, true);
// Note: The real kernel seems to always panic if the Server->Client buffer translation
// fails for whatever reason.