From 56c7912159e210e009228f83e6c3ead3e5c99d4b Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Sun, 7 Jul 2019 04:19:16 -0400
Subject: [PATCH] kernel/process: Allocate the process' TLS region during
 initialization

Prior to execution within a process beginning, the process establishes
its own TLS region for uses (as far as I can tell) related to exception
handling.

Now that TLS creation was decoupled from threads themselves, we can add
this behavior to our Process class. This is also good, as it allows us
to remove a stub within svcGetInfo, namely querying the address of that
region.
---
 src/core/hle/kernel/process.cpp | 5 +++++
 src/core/hle/kernel/process.h   | 8 ++++++++
 src/core/hle/kernel/svc.cpp     | 4 +---
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/src/core/hle/kernel/process.cpp b/src/core/hle/kernel/process.cpp
index 90d579b5cf..73ee1eb0f9 100644
--- a/src/core/hle/kernel/process.cpp
+++ b/src/core/hle/kernel/process.cpp
@@ -187,6 +187,8 @@ ResultCode Process::LoadFromMetadata(const FileSys::ProgramMetadata& metadata) {
 
 void Process::Run(s32 main_thread_priority, u64 stack_size) {
     AllocateMainThreadStack(stack_size);
+    tls_region_address = CreateTLSRegion();
+
     vm_manager.LogLayout();
 
     ChangeStatus(ProcessStatus::Running);
@@ -218,6 +220,9 @@ void Process::PrepareForTermination() {
     stop_threads(system.Scheduler(2).GetThreadList());
     stop_threads(system.Scheduler(3).GetThreadList());
 
+    FreeTLSRegion(tls_region_address);
+    tls_region_address = 0;
+
     ChangeStatus(ProcessStatus::Exited);
 }
 
diff --git a/src/core/hle/kernel/process.h b/src/core/hle/kernel/process.h
index 492d8ea4f9..afde9567e2 100644
--- a/src/core/hle/kernel/process.h
+++ b/src/core/hle/kernel/process.h
@@ -135,6 +135,11 @@ public:
         return mutex;
     }
 
+    /// Gets the address to the process' dedicated TLS region.
+    VAddr GetTLSRegionAddress() const {
+        return tls_region_address;
+    }
+
     /// Gets the current status of the process
     ProcessStatus GetStatus() const {
         return status;
@@ -341,6 +346,9 @@ private:
     /// variable related facilities.
     Mutex mutex;
 
+    /// Address indicating the location of the process' dedicated TLS region.
+    VAddr tls_region_address = 0;
+
     /// Random values for svcGetInfo RandomEntropy
     std::array<u64, RANDOM_ENTROPY_SIZE> random_entropy{};
 
diff --git a/src/core/hle/kernel/svc.cpp b/src/core/hle/kernel/svc.cpp
index 332573a955..7621171279 100644
--- a/src/core/hle/kernel/svc.cpp
+++ b/src/core/hle/kernel/svc.cpp
@@ -831,9 +831,7 @@ static ResultCode GetInfo(Core::System& system, u64* result, u64 info_id, u64 ha
             return RESULT_SUCCESS;
 
         case GetInfoType::UserExceptionContextAddr:
-            LOG_WARNING(Kernel_SVC,
-                        "(STUBBED) Attempted to query user exception context address, returned 0");
-            *result = 0;
+            *result = process->GetTLSRegionAddress();
             return RESULT_SUCCESS;
 
         case GetInfoType::TotalPhysicalMemoryAvailableWithoutMmHeap: