6 files changed, 41 insertions, 1 deletions
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index f38271336..8f2db5bea 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -1,5 +1,6 @@
 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
diff --git a/src/core/arm/arm_interface.cpp b/src/core/arm/arm_interface.cpp
new file mode 100644
index 000000000..bcc812da4
--- /dev/null
+++ b/src/core/arm/arm_interface.cpp
@@ -0,0 +1,26 @@
+// 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
diff --git a/src/core/arm/arm_interface.h b/src/core/arm/arm_interface.h
index 59da33f30..91d2b0f81 100644
--- a/src/core/arm/arm_interface.h
+++ b/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
diff --git a/src/core/arm/unicorn/arm_unicorn.cpp b/src/core/arm/unicorn/arm_unicorn.cpp
index ded4dd359..c455c81fb 100644
--- a/src/core/arm/unicorn/arm_unicorn.cpp
+++ b/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 {
 
diff --git a/src/core/hle/kernel/svc.cpp b/src/core/hle/kernel/svc.cpp
index b955f9839..5fac831ee 100644
--- a/src/core/hle/kernel/svc.cpp
+++ b/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();
diff --git a/src/core/hle/service/fatal/fatal.cpp b/src/core/hle/service/fatal/fatal.cpp
index 2f15ac2a6..770590d0b 100644
--- a/src/core/hle/service/fatal/fatal.cpp
+++ b/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);