Improve the state of handwritten assembly files (#865)

* Format all handwritten asm and document some

* Use c preprocessor for constants

* Fix

* Fix PI_STATUS_ERROR, some label improvements

* Avoid hi/lo for constants

* Some more comments

* Properly mark functions as functions and their sizes

* Fix merge

* Improvements

* Review suggestions, rework procedure start/end macros to be more like libreultra

* Move IPL3 symbol definitions into ipl3.s

* Fix undefined_syms, add include and language guards to asm.h and fix the comment in gbi.h

* Consistent hex capitalization, add some MIPS builtin defines to CC_CHECK to behave properly

* Add -no-pad-sections assembler option and clean up alignment in gu files and bzero

* Further suggestions and improvements

* Matrix conversion function clarifications

* Fix passing AVOID_UB to gcc

* Suggestions

* Suggestions, global interrupt mask improvements

* Further suggestions, interrupt mask comments

* Comments fixes, rdb.h

* Switch from # comments to // comments, remove unnecesary .set gp=64 directives

* Further review suggestions

* Missed one

include/ultra64/exception.h

@@ -1,10 +1,9 @@
 #ifndef ULTRA64_EXCEPTION_H
 #define ULTRA64_EXCEPTION_H
 
-#include "types.h"
-
 // Interrupt masks
 #define OS_IM_NONE      0x00000001
+#define OS_IM_RCP       0x00000401
 #define OS_IM_SW1       0x00000501
 #define OS_IM_SW2       0x00000601
 #define OS_IM_CART      0x00000C01
@@ -24,6 +23,13 @@
 #define RCP_IMASK       0x003F0000
 #define RCP_IMASKSHIFT  16
 
+// OSHWIntr values
+#define OS_INTR_CART    1
+
+#ifdef _LANGUAGE_C
+
+#include "types.h"
+
 typedef u32 OSIntMask;
 typedef u32 OSHWIntr;
 
@@ -42,4 +48,15 @@ void __osResetGlobalIntMask(OSHWIntr mask);
 
 extern __osHwInt __osHwIntTable[];
 
+#else
+
+// __osHwInt struct member offsets
+#define HWINT_CALLBACK 0x00
+#define HWINT_SP       0x04
+
+// __osHwInt struct size
+#define HWINT_SIZE     0x8
+
+#endif
+
 #endif