From 31e54c4573236473563d892f7101d244c4f71d36 Mon Sep 17 00:00:00 2001 From: Liam Date: Tue, 27 Dec 2022 19:51:37 -0500 Subject: kernel: KPageTable: update --- src/core/hle/kernel/k_process.cpp | 40 ++++++++++++++++++++++++--------------- 1 file changed, 25 insertions(+), 15 deletions(-) (limited to 'src/core/hle/kernel/k_process.cpp') diff --git a/src/core/hle/kernel/k_process.cpp b/src/core/hle/kernel/k_process.cpp index a1abf5d68..e201bb0cd 100644 --- a/src/core/hle/kernel/k_process.cpp +++ b/src/core/hle/kernel/k_process.cpp @@ -417,9 +417,8 @@ Result KProcess::LoadFromMetadata(const FileSys::ProgramMetadata& metadata, std: } void KProcess::Run(s32 main_thread_priority, u64 stack_size) { - AllocateMainThreadStack(stack_size); + ASSERT(AllocateMainThreadStack(stack_size) == ResultSuccess); resource_limit->Reserve(LimitableResource::ThreadCountMax, 1); - resource_limit->Reserve(LimitableResource::PhysicalMemoryMax, main_thread_stack_size); const std::size_t heap_capacity{memory_usage_capacity - (main_thread_stack_size + image_size)}; ASSERT(!page_table.SetMaxHeapSize(heap_capacity).IsError()); @@ -675,20 +674,31 @@ void KProcess::ChangeState(State new_state) { } Result KProcess::AllocateMainThreadStack(std::size_t stack_size) { - ASSERT(stack_size); - - // The kernel always ensures that the given stack size is page aligned. - main_thread_stack_size = Common::AlignUp(stack_size, PageSize); - - const VAddr start{page_table.GetStackRegionStart()}; - const std::size_t size{page_table.GetStackRegionEnd() - start}; - - CASCADE_RESULT(main_thread_stack_top, - page_table.AllocateAndMapMemory( - main_thread_stack_size / PageSize, PageSize, false, start, size / PageSize, - KMemoryState::Stack, KMemoryPermission::UserReadWrite)); + // Ensure that we haven't already allocated stack. + ASSERT(main_thread_stack_size == 0); + + // Ensure that we're allocating a valid stack. + stack_size = Common::AlignUp(stack_size, PageSize); + // R_UNLESS(stack_size + image_size <= m_max_process_memory, ResultOutOfMemory); + R_UNLESS(stack_size + image_size >= image_size, ResultOutOfMemory); + + // Place a tentative reservation of memory for our new stack. + KScopedResourceReservation mem_reservation(this, Svc::LimitableResource::PhysicalMemoryMax, + stack_size); + R_UNLESS(mem_reservation.Succeeded(), ResultLimitReached); + + // Allocate and map our stack. + if (stack_size) { + KProcessAddress stack_bottom; + R_TRY(page_table.MapPages(std::addressof(stack_bottom), stack_size / PageSize, + KMemoryState::Stack, KMemoryPermission::UserReadWrite)); + + main_thread_stack_top = stack_bottom + stack_size; + main_thread_stack_size = stack_size; + } - main_thread_stack_top += main_thread_stack_size; + // We succeeded! Commit our memory reservation. + mem_reservation.Commit(); R_SUCCEED(); } -- cgit v1.2.3