libultra files and directories restructure (#1038)

* Restructure files, begin header restructure

* Format

* us2dex

* Fix parallel spelling

Co-authored-by: JoshDuMan <40190173+JoshDuMan@users.noreply.github.com>

* Use OS_K0_TO_PHYSICAL in place of VIRTUAL_TO_PHYSICAL in osAiSetNextBuffer

* Uppercase hex, exception vector address defines

* Interrupt flags 1

Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>

* Interrupt flags 2

Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>

Co-authored-by: JoshDuMan <40190173+JoshDuMan@users.noreply.github.com>
Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>

5 files changed, 110 insertions, 0 deletions

diff --git a/include/libc/math.h b/include/libc/math.h
new file mode 100644
index 000000000..bceffad22
--- /dev/null
+++ b/include/libc/math.h
@@ -0,0 +1,29 @@
+#ifndef MATH_H
+#define MATH_H
+
+#include "ultra64/types.h"
+
+#define M_PI 3.14159265358979323846f
+#define M_SQRT2 1.41421356237309504880f
+#define FLT_MAX 340282346638528859811704183484516925440.0f
+#define SHT_MAX 32767.0f
+#define SHT_MINV (1.0f / SHT_MAX)
+#define DEGTORAD(x) (x * M_PI / 180.0f)
+
+typedef union {
+    struct {
+        u32 hi;
+        u32 lo;
+    } word;
+
+    f64 d;
+} du;
+
+typedef union {
+    u32 i;
+    f32 f;
+} fu;
+
+extern f32 __libm_qnan_f;
+
+#endif
diff --git a/include/libc/stdarg.h b/include/libc/stdarg.h
new file mode 100644
index 000000000..0744dfa60
--- /dev/null
+++ b/include/libc/stdarg.h
@@ -0,0 +1,43 @@
+#ifndef STDARG_H
+#define STDARG_H
+
+// When building with GCC, use the official vaarg macros to avoid warnings
+// and possibly bad codegen.
+#ifdef __GNUC__
+#define va_list __builtin_va_list
+#define va_start __builtin_va_start
+#define va_arg __builtin_va_arg
+#define va_end __builtin_va_end
+#else
+
+typedef char* va_list;
+#define _FP 1
+#define _INT 0
+#define _STRUCT 2
+
+#define _VA_FP_SAVE_AREA 0x10
+#define _VA_ALIGN(p, a) (((u32)(((char*)p) + ((a) > 4 ? (a) : 4) - 1)) & -((a) > 4 ? (a) : 4))
+#define va_start(vp, parmN) (vp = ((va_list)&parmN + sizeof(parmN)))
+
+#define __va_stack_arg(list, mode)                          \
+    (                                                       \
+        ((list) = (char*)_VA_ALIGN(list, __builtin_alignof(mode)) + \
+                  _VA_ALIGN(sizeof(mode), 4)),              \
+        (((char*)list) - (_VA_ALIGN(sizeof(mode), 4) - sizeof(mode))))
+
+#define __va_double_arg(list, mode)                                                                    \
+    (                                                                                                  \
+        (((s32)list & 0x1) /* 1 byte aligned? */                                                      \
+             ? (list = (char*)((s32)list + 7), (char*)((s32)list - 6 - _VA_FP_SAVE_AREA))          \
+             : (((s32)list & 0x2) /* 2 byte aligned? */                                               \
+                    ? (list = (char*)((s32)list + 10), (char*)((s32)list - 24 - _VA_FP_SAVE_AREA)) \
+                    : __va_stack_arg(list, mode))))
+
+#define va_arg(list, mode) ((mode*)(((__builtin_classof(mode) == _FP &&          \
+                                       __builtin_alignof(mode) == sizeof(f64)) \
+                                          ? __va_double_arg(list, mode)           \
+                                          : __va_stack_arg(list, mode))))[-1]
+#define va_end(__list)
+
+#endif
+#endif
diff --git a/include/libc/stdbool.h b/include/libc/stdbool.h
new file mode 100644
index 000000000..4495977a9
--- /dev/null
+++ b/include/libc/stdbool.h
@@ -0,0 +1,14 @@
+#ifndef STDBOOL_H
+#define STDBOOL_H
+
+#define __bool_true_false_are_defined 1
+
+#ifndef __cplusplus
+
+#define bool    u32
+#define false   0
+#define true    1
+
+#endif /* __cplusplus */
+
+#endif /* STDBOOL */
diff --git a/include/libc/stddef.h b/include/libc/stddef.h
new file mode 100644
index 000000000..7a481e97e
--- /dev/null
+++ b/include/libc/stddef.h
@@ -0,0 +1,8 @@
+#ifndef STDDEF_H
+#define STDDEF_H
+
+#define NULL ((void*)0)
+
+typedef unsigned long size_t;
+
+#endif
diff --git a/include/libc/stdlib.h b/include/libc/stdlib.h
new file mode 100644
index 000000000..75657d8db
--- /dev/null
+++ b/include/libc/stdlib.h
@@ -0,0 +1,16 @@
+#ifndef STDLIB_H
+#define STDLIB_H
+
+#include "ultra64.h"
+
+typedef struct lldiv_t {
+    s64 quot;
+    s64 rem;
+} lldiv_t;
+
+typedef struct ldiv_t {
+    s32 quot;
+    s32 rem;
+} ldiv_t;
+
+#endif