From 96140b0d163d18c0158f29b2063307efad918e18 Mon Sep 17 00:00:00 2001
From: mrb0nk500 <b0nk@b0nk.xyz>
Date: Mon, 30 Jan 2023 11:25:36 -0400
Subject: Global: Add necessary files to test linking

---
 include/NMWException.h                | 26 ++++++++++++++++++
 obj_files.mk                          |  3 ++
 src/Runtime/Gecko_ExceptionPPC.cpp    | 42 ++++++++++++++++++++++++++++
 src/Runtime/__init_cpp_exceptions.cpp | 52 +++++++++++++++++++++++++++++++++++
 src/Runtime/global_destructor_chain.c |  2 +-
 5 files changed, 124 insertions(+), 1 deletion(-)
 create mode 100644 include/NMWException.h
 create mode 100644 src/Runtime/Gecko_ExceptionPPC.cpp
 create mode 100644 src/Runtime/__init_cpp_exceptions.cpp

diff --git a/include/NMWException.h b/include/NMWException.h
new file mode 100644
index 0000000..9cf7e48
--- /dev/null
+++ b/include/NMWException.h
@@ -0,0 +1,26 @@
+#ifndef NMWEXCEPTION_H
+#define NMWEXCEPTION_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef void (dtor_func)(void *object, int free_object);
+typedef struct destructor_chain dtor_chain;
+
+struct destructor_chain {
+	dtor_chain *next;
+	dtor_func *destructor;
+	void *object;
+};
+
+void __unregister_fragment(int fragmentID);
+int __register_fragment(struct __eti_init_info *info, char *TOC);
+void *__register_global_object(void *object, dtor_func *destructor, dtor_chain *regmem);
+void __destroy_global_chain();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/obj_files.mk b/obj_files.mk
index 2e65fa0..4677312 100644
--- a/obj_files.mk
+++ b/obj_files.mk
@@ -2,5 +2,8 @@ O_FILES := $(BUILD_DIR)/src/main.o \
 	$(BUILD_DIR)/src/pso/TMainTask.o \
 	$(BUILD_DIR)/src/pso/TObject.o \
 	$(BUILD_DIR)/src/Runtime/global_destructor_chain.o \
+	$(BUILD_DIR)/src/Runtime/Gecko_ExceptionPPC.o \
+	$(BUILD_DIR)/src/Runtime/__init_cpp_exceptions.o \
+	$(BUILD_DIR)/src/Runtime/abort_exit.o \
 	$(BUILD_DIR)/src/Dolphin/os/__start.o \
 	$(BUILD_DIR)/src/Dolphin/os/__ppc_eabi_init.o
diff --git a/src/Runtime/Gecko_ExceptionPPC.cpp b/src/Runtime/Gecko_ExceptionPPC.cpp
new file mode 100644
index 0000000..693aa25
--- /dev/null
+++ b/src/Runtime/Gecko_ExceptionPPC.cpp
@@ -0,0 +1,42 @@
+// This file was taken from the Metroid Prime decompilation project.
+// https://github.com/PrimeDecomp/prime/blob/main/src/Runtime/Gecko_ExceptionPPC.cpp
+#include "__ppc_eabi_linker.h"
+#include "NMWException.h"
+
+#if __MWERKS__
+#pragma exceptions on
+#endif
+
+typedef struct ProcessInfo {
+  __eti_init_info* exception_info;
+  char* TOC;
+  int active;
+} ProcessInfo;
+
+static ProcessInfo fragmentinfo[1];
+
+int __register_fragment(struct __eti_init_info* info, char* TOC) {
+  ProcessInfo* f;
+  int i;
+
+  for (i = 0, f = fragmentinfo; i < 1; ++i, ++f) {
+    if (f->active == 0) {
+      f->exception_info = info;
+      f->TOC = TOC;
+      f->active = 1;
+      return (i);
+    }
+  }
+
+  return (-1);
+}
+
+void __unregister_fragment(int fragmentId) {
+  ProcessInfo* f;
+  if (fragmentId >= 0 && fragmentId < 1) {
+    f = &fragmentinfo[fragmentId];
+    f->exception_info = 0;
+    f->TOC = 0;
+    f->active = 0;
+  }
+}
diff --git a/src/Runtime/__init_cpp_exceptions.cpp b/src/Runtime/__init_cpp_exceptions.cpp
new file mode 100644
index 0000000..937cc79
--- /dev/null
+++ b/src/Runtime/__init_cpp_exceptions.cpp
@@ -0,0 +1,52 @@
+// This file was taken from the Metroid Prime decompilation project.
+// https://github.com/PrimeDecomp/prime/blob/main/src/Runtime/__init_cpp_exceptions.cpp
+#include "NMWException.h"
+#include "__ppc_eabi_linker.h"
+
+static int fragmentID = -2;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern void __init_cpp_exceptions(void);
+extern void __fini_cpp_exceptions(void);
+extern void suspend(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+/* clang-format off */
+static asm char* GetR2() {
+  nofralloc;
+  mr r3, r2
+  blr
+}
+/* clang-format on */
+
+extern void __init_cpp_exceptions(void) {
+  char* R2;
+  if (fragmentID == -2) {
+
+    R2 = GetR2();
+
+    /* HACK: TODO: _eti_init_info should be _eti_init_info, we can't use the appropriate name yet due to the
+     * linker not being able to generate it*/
+    fragmentID = __register_fragment(_eti_init_info, R2);
+  }
+}
+
+extern void __fini_cpp_exceptions(void) {
+  if (fragmentID != -2) {
+    __unregister_fragment(fragmentID);
+    fragmentID = -2;
+  }
+}
+
+__declspec(section
+           ".ctors") static void* const __init_cpp_exceptions_reference = __init_cpp_exceptions;
+__declspec(section
+           ".dtors") static void* const __destroy_global_chain_reference = __destroy_global_chain;
+__declspec(section
+           ".dtors") static void* const __fini_cpp_exceptions_reference = __fini_cpp_exceptions;
diff --git a/src/Runtime/global_destructor_chain.c b/src/Runtime/global_destructor_chain.c
index b96c8f3..1f3790d 100644
--- a/src/Runtime/global_destructor_chain.c
+++ b/src/Runtime/global_destructor_chain.c
@@ -10,7 +10,7 @@ extern void *__register_global_object(void *object, dtor_func *destructor, dtor_
 	return object;
 }
 
-extern void __destroy_global_chain() {
+void __destroy_global_chain() {
 	dtor_chain *iter = __global_destructor_chain;
 	while (__global_destructor_chain != 0) {
 		iter = __global_destructor_chain;
-- 
cgit v1.2.3-13-gbd6f