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-rw-r--r--src/core/hle/kernel/k_process.cpp25
-rw-r--r--src/core/hle/kernel/k_process.h7
2 files changed, 27 insertions, 5 deletions
diff --git a/src/core/hle/kernel/k_process.cpp b/src/core/hle/kernel/k_process.cpp
index e573e2a57..703049ede 100644
--- a/src/core/hle/kernel/k_process.cpp
+++ b/src/core/hle/kernel/k_process.cpp
@@ -38,7 +38,7 @@ namespace {
*/
void SetupMainThread(Core::System& system, KProcess& owner_process, u32 priority,
KProcessAddress stack_top) {
- const KProcessAddress entry_point = owner_process.GetPageTable().GetCodeRegionStart();
+ const KProcessAddress entry_point = owner_process.GetEntryPoint();
ASSERT(owner_process.GetResourceLimit()->Reserve(LimitableResource::ThreadCountMax, 1));
KThread* thread = KThread::Create(system.Kernel());
@@ -358,6 +358,21 @@ Result KProcess::LoadFromMetadata(const FileSys::ProgramMetadata& metadata, std:
m_system_resource_size = metadata.GetSystemResourceSize();
m_image_size = code_size;
+ if (metadata.GetAddressSpaceType() == FileSys::ProgramAddressSpaceType::Is39Bit) {
+ // For 39-bit processes, the ASLR region starts at 0x800'0000 and is ~512GiB large.
+ // However, some (buggy) programs/libraries like skyline incorrectly depend on the
+ // existence of ASLR pages before the entry point, so we will adjust the load address
+ // to point to about 2GiB into the ASLR region.
+ m_code_address = 0x8000'0000;
+ } else {
+ // All other processes can be mapped at the beginning of the code region.
+ if (metadata.GetAddressSpaceType() == FileSys::ProgramAddressSpaceType::Is36Bit) {
+ m_code_address = 0x800'0000;
+ } else {
+ m_code_address = 0x20'0000;
+ }
+ }
+
KScopedResourceReservation memory_reservation(
m_resource_limit, LimitableResource::PhysicalMemoryMax, code_size + m_system_resource_size);
if (!memory_reservation.Succeeded()) {
@@ -368,15 +383,15 @@ Result KProcess::LoadFromMetadata(const FileSys::ProgramMetadata& metadata, std:
// Initialize process address space
if (const Result result{m_page_table.InitializeForProcess(
metadata.GetAddressSpaceType(), false, false, false, KMemoryManager::Pool::Application,
- 0x8000000, code_size, std::addressof(m_kernel.GetAppSystemResource()), m_resource_limit,
- m_kernel.System().ApplicationMemory())};
+ this->GetEntryPoint(), code_size, std::addressof(m_kernel.GetAppSystemResource()),
+ m_resource_limit, m_kernel.System().ApplicationMemory())};
result.IsError()) {
R_RETURN(result);
}
// Map process code region
- if (const Result result{m_page_table.MapProcessCode(m_page_table.GetCodeRegionStart(),
- code_size / PageSize, KMemoryState::Code,
+ if (const Result result{m_page_table.MapProcessCode(this->GetEntryPoint(), code_size / PageSize,
+ KMemoryState::Code,
KMemoryPermission::None)};
result.IsError()) {
R_RETURN(result);
diff --git a/src/core/hle/kernel/k_process.h b/src/core/hle/kernel/k_process.h
index c9b37e138..4fdeaf11a 100644
--- a/src/core/hle/kernel/k_process.h
+++ b/src/core/hle/kernel/k_process.h
@@ -177,6 +177,10 @@ public:
return m_program_id;
}
+ KProcessAddress GetEntryPoint() const {
+ return m_code_address;
+ }
+
/// Gets the resource limit descriptor for this process
KResourceLimit* GetResourceLimit() const;
@@ -485,6 +489,9 @@ private:
/// Address indicating the location of the process' dedicated TLS region.
KProcessAddress m_plr_address = 0;
+ /// Address indicating the location of the process's entry point.
+ KProcessAddress m_code_address = 0;
+
/// Random values for svcGetInfo RandomEntropy
std::array<u64, RANDOM_ENTROPY_SIZE> m_random_entropy{};