diff --git a/src/xenia/cpu/backend/x64/x64_assembler.cc b/src/xenia/cpu/backend/x64/x64_assembler.cc
index ab6d121e3..dff7477b6 100644
--- a/src/xenia/cpu/backend/x64/x64_assembler.cc
+++ b/src/xenia/cpu/backend/x64/x64_assembler.cc
@@ -126,7 +126,7 @@ void X64Assembler::DumpMachineCode(
     if (code_offset >= next_code_offset &&
         source_map_index < source_map.size()) {
       auto& source_map_entry = source_map[source_map_index];
-      str->AppendFormat("%.8X ", source_map_entry.source_offset);
+      str->AppendFormat("%.8X ", source_map_entry.guest_address);
       ++source_map_index;
       next_code_offset = source_map_index < source_map.size()
                              ? source_map[source_map_index].code_offset
diff --git a/src/xenia/cpu/backend/x64/x64_emitter.cc b/src/xenia/cpu/backend/x64/x64_emitter.cc
index c4661376c..b4517bfe5 100644
--- a/src/xenia/cpu/backend/x64/x64_emitter.cc
+++ b/src/xenia/cpu/backend/x64/x64_emitter.cc
@@ -254,21 +254,21 @@ bool X64Emitter::Emit(HIRBuilder* builder, size_t* out_stack_size) {
 
 void X64Emitter::MarkSourceOffset(const Instr* i) {
   auto entry = source_map_arena_.Alloc<SourceMapEntry>();
-  entry->source_offset = static_cast<uint32_t>(i->src1.offset);
+  entry->guest_address = static_cast<uint32_t>(i->src1.offset);
   entry->hir_offset = uint32_t(i->block->ordinal << 16) | i->ordinal;
   entry->code_offset = static_cast<uint32_t>(getSize());
 
   if (FLAGS_emit_source_annotations) {
     nop();
     nop();
-    mov(eax, entry->source_offset);
+    mov(eax, entry->guest_address);
     nop();
     nop();
   }
 
   if (debug_info_flags_ & DebugInfoFlags::kDebugInfoTraceFunctionCoverage) {
     uint32_t instruction_index =
-        (entry->source_offset - trace_data_->start_address()) / 4;
+        (entry->guest_address - trace_data_->start_address()) / 4;
     lock();
     inc(qword[low_address(trace_data_->instruction_execute_counts() +
                           instruction_index * 8)]);
diff --git a/src/xenia/cpu/function.cc b/src/xenia/cpu/function.cc
index 768f10474..ce063d917 100644
--- a/src/xenia/cpu/function.cc
+++ b/src/xenia/cpu/function.cc
@@ -65,11 +65,12 @@ void GuestFunction::SetupExtern(ExternHandler handler) {
   extern_handler_ = handler;
 }
 
-const SourceMapEntry* GuestFunction::LookupSourceOffset(uint32_t offset) const {
+const SourceMapEntry* GuestFunction::LookupGuestAddress(
+    uint32_t guest_address) const {
   // TODO(benvanik): binary search? We know the list is sorted by code order.
   for (size_t i = 0; i < source_map_.size(); ++i) {
     const auto& entry = source_map_[i];
-    if (entry.source_offset == offset) {
+    if (entry.guest_address == guest_address) {
       return &entry;
     }
   }
@@ -87,7 +88,8 @@ const SourceMapEntry* GuestFunction::LookupHIROffset(uint32_t offset) const {
   return nullptr;
 }
 
-const SourceMapEntry* GuestFunction::LookupCodeOffset(uint32_t offset) const {
+const SourceMapEntry* GuestFunction::LookupMachineCodeOffset(
+    uint32_t offset) const {
   // TODO(benvanik): binary search? We know the list is sorted by code order.
   for (int64_t i = source_map_.size() - 1; i >= 0; --i) {
     const auto& entry = source_map_[i];
@@ -98,16 +100,24 @@ const SourceMapEntry* GuestFunction::LookupCodeOffset(uint32_t offset) const {
   return source_map_.empty() ? nullptr : &source_map_[0];
 }
 
-uintptr_t GuestFunction::MapSourceToCode(uint32_t source_address) const {
-  auto entry = LookupSourceOffset(source_address - address());
-  return entry ? entry->code_offset
-               : reinterpret_cast<uintptr_t>(machine_code());
+uint32_t GuestFunction::MapGuestAddressToMachineCodeOffset(
+    uint32_t guest_address) const {
+  auto entry = LookupGuestAddress(guest_address);
+  return entry ? entry->code_offset : 0;
 }
 
-uint32_t GuestFunction::MapCodeToSource(uintptr_t host_address) const {
-  auto entry = LookupCodeOffset(static_cast<uint32_t>(
+uintptr_t GuestFunction::MapGuestAddressToMachineCode(
+    uint32_t guest_address) const {
+  auto entry = LookupGuestAddress(guest_address);
+  return reinterpret_cast<uintptr_t>(machine_code()) +
+         (entry ? entry->code_offset : 0);
+}
+
+uint32_t GuestFunction::MapMachineCodeToGuestAddress(
+    uintptr_t host_address) const {
+  auto entry = LookupMachineCodeOffset(static_cast<uint32_t>(
       host_address - reinterpret_cast<uintptr_t>(machine_code())));
-  return entry ? entry->source_offset : address();
+  return entry ? entry->guest_address : address();
 }
 
 bool GuestFunction::Call(ThreadState* thread_state, uint32_t return_address) {
diff --git a/src/xenia/cpu/function.h b/src/xenia/cpu/function.h
index 0688da17c..19963e25d 100644
--- a/src/xenia/cpu/function.h
+++ b/src/xenia/cpu/function.h
@@ -23,7 +23,7 @@ namespace xe {
 namespace cpu {
 
 struct SourceMapEntry {
-  uint32_t source_offset;  // Original source address/offset.
+  uint32_t guest_address;  // PPC guest address (0x82....).
   uint32_t hir_offset;     // Block ordinal (16b) | Instr ordinal (16b)
   uint32_t code_offset;    // Offset from emitted code start.
 };
@@ -106,12 +106,13 @@ class GuestFunction : public Function {
   ExternHandler extern_handler() const { return extern_handler_; }
   void SetupExtern(ExternHandler handler);
 
-  const SourceMapEntry* LookupSourceOffset(uint32_t offset) const;
+  const SourceMapEntry* LookupGuestAddress(uint32_t guest_address) const;
   const SourceMapEntry* LookupHIROffset(uint32_t offset) const;
-  const SourceMapEntry* LookupCodeOffset(uint32_t offset) const;
+  const SourceMapEntry* LookupMachineCodeOffset(uint32_t offset) const;
 
-  uintptr_t MapSourceToCode(uint32_t source_address) const;
-  uint32_t MapCodeToSource(uintptr_t host_address) const;
+  uint32_t MapGuestAddressToMachineCodeOffset(uint32_t guest_address) const;
+  uintptr_t MapGuestAddressToMachineCode(uint32_t guest_address) const;
+  uint32_t MapMachineCodeToGuestAddress(uintptr_t host_address) const;
 
   bool Call(ThreadState* thread_state, uint32_t return_address) override;
 
diff --git a/src/xenia/cpu/stack_walker_win.cc b/src/xenia/cpu/stack_walker_win.cc
index f80108bed..0902c167e 100644
--- a/src/xenia/cpu/stack_walker_win.cc
+++ b/src/xenia/cpu/stack_walker_win.cc
@@ -239,11 +239,8 @@ class Win32StackWalker : public StackWalker {
           // displacement in x64 from the JIT'ed code start to the PC.
           if (function->is_guest()) {
             auto guest_function = static_cast<GuestFunction*>(function);
-            uint32_t host_displacement =
-                uint32_t(frame.host_pc) -
-                uint32_t(uint64_t(guest_function->machine_code()));
-            auto entry = guest_function->LookupCodeOffset(host_displacement);
-            frame.guest_pc = entry->source_offset;
+            frame.guest_pc =
+                guest_function->MapMachineCodeToGuestAddress(frame.host_pc);
           }
         } else {
           frame.guest_symbol.function = nullptr;
diff --git a/src/xenia/debug/breakpoint.cc b/src/xenia/debug/breakpoint.cc
index 9b96d1f22..08b740257 100644
--- a/src/xenia/debug/breakpoint.cc
+++ b/src/xenia/debug/breakpoint.cc
@@ -45,7 +45,8 @@ void CodeBreakpoint::ForEachHostAddress(
       // TODO(benvanik): other function types.
       assert_true(function->is_guest());
       auto guest_function = reinterpret_cast<cpu::GuestFunction*>(function);
-      uintptr_t host_address = guest_function->MapSourceToCode(guest_address);
+      uintptr_t host_address =
+          guest_function->MapGuestAddressToMachineCode(guest_address);
       assert_not_zero(host_address);
       callback(host_address);
     }
diff --git a/src/xenia/debug/ui/debug_window.cc b/src/xenia/debug/ui/debug_window.cc
index d72908cf1..2869ce891 100644
--- a/src/xenia/debug/ui/debug_window.cc
+++ b/src/xenia/debug/ui/debug_window.cc
@@ -608,7 +608,7 @@ void DebugWindow::DrawGuestFunctionSource() {
     }
 
     while (source_map_index < source_map.size() &&
-           source_map[source_map_index].source_offset != address) {
+           source_map[source_map_index].guest_address != address) {
       ++source_map_index;
     }
     if (source_map_index < source_map.size()) {
@@ -1423,13 +1423,14 @@ void DebugWindow::DrawBreakpointsPane() {
             assert_not_null(function);
             if (code_breakpoint->address_type() ==
                 CodeBreakpoint::AddressType::kGuest) {
-              NavigateToFunction(
-                  code_breakpoint->guest_function(),
-                  code_breakpoint->guest_address(),
-                  function->MapSourceToCode(code_breakpoint->guest_address()));
+              NavigateToFunction(code_breakpoint->guest_function(),
+                                 code_breakpoint->guest_address(),
+                                 function->MapGuestAddressToMachineCode(
+                                     code_breakpoint->guest_address()));
             } else {
-              NavigateToFunction(function, function->MapCodeToSource(
-                                               code_breakpoint->host_address()),
+              NavigateToFunction(function,
+                                 function->MapMachineCodeToGuestAddress(
+                                     code_breakpoint->host_address()),
                                  code_breakpoint->host_address());
             }
             break;