Merge pull request #1847 from ogniK5377/backtrace-break

Print backtrace on svcBreak

src/core/CMakeLists.txt

 add_library(core STATIC
     arm/arm_interface.h
+    arm/arm_interface.cpp
     arm/exclusive_monitor.cpp
     arm/exclusive_monitor.h
     arm/unicorn/arm_unicorn.cpp

src/core/arm/arm_interface.cpp

+// Copyright 2018 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "arm_interface.h"
+#include "common/common_types.h"
+#include "common/logging/log.h"
+#include "core/memory.h"
+
+namespace Core {
+void ARM_Interface::LogBacktrace() {
+    VAddr fp = GetReg(29);
+    VAddr lr = GetReg(30);
+    VAddr sp = GetReg(13);
+    VAddr pc = GetPC();
+    LOG_ERROR(Core_ARM, "Backtrace, sp={:016X}, pc={:016X}", sp, pc);
+    for (;;) {
+        LOG_ERROR(Core_ARM, "{:016X}", lr);
+        if (!fp) {
+            break;
+        }
+        lr = Memory::Read64(fp + 8) - 4;
+        fp = Memory::Read64(fp);
+    }
+}
+}; // namespace Core

src/core/arm/arm_interface.h

@@ -141,6 +141,14 @@ public:
 
     /// Prepare core for thread reschedule (if needed to correctly handle state)
     virtual void PrepareReschedule() = 0;
+
+    /// fp (= r29) points to the last frame record.
+    /// Note that this is the frame record for the *previous* frame, not the current one.
+    /// Note we need to subtract 4 from our last read to get the proper address
+    /// Frame records are two words long:
+    /// fp+0 : pointer to previous frame record
+    /// fp+8 : value of lr for frame
+    void LogBacktrace();
 };
 
 } // namespace Core

src/core/arm/unicorn/arm_unicorn.cpp

@@ -10,6 +10,7 @@
 #include "core/core.h"
 #include "core/core_timing.h"
 #include "core/hle/kernel/svc.h"
+#include "core/memory.h"
 
 namespace Core {
 

src/core/hle/kernel/svc.cpp

@@ -684,6 +684,9 @@ static void Break(u32 reason, u64 info1, u64 info2) {
             "Emulated program broke execution! reason=0x{:016X}, info1=0x{:016X}, info2=0x{:016X}",
             reason, info1, info2);
         handle_debug_buffer(info1, info2);
+        Core::System::GetInstance()
+            .ArmInterface(static_cast<std::size_t>(GetCurrentThread()->GetProcessorID()))
+            .LogBacktrace();
         ASSERT(false);
 
         Core::CurrentProcess()->PrepareForTermination();

src/core/hle/service/fatal/fatal.cpp

@@ -111,7 +111,8 @@ static void GenerateErrorReport(ResultCode error_code, const FatalInfo& info) {
 }
 
 static void ThrowFatalError(ResultCode error_code, FatalType fatal_type, const FatalInfo& info) {
-    LOG_ERROR(Service_Fatal, "Threw fatal error type {}", static_cast<u32>(fatal_type));
+    LOG_ERROR(Service_Fatal, "Threw fatal error type {} with error code 0x{:X}",
+              static_cast<u32>(fatal_type), error_code.raw);
     switch (fatal_type) {
     case FatalType::ErrorReportAndScreen:
         GenerateErrorReport(error_code, info);