initial dietc commit

1 files changed, 46 insertions, 0 deletions

diff --git a/scripts/stdincludes/stdarg.h b/scripts/stdincludes/stdarg.h
new file mode 100644
index 0000000..73563b4
--- /dev/null
+++ b/scripts/stdincludes/stdarg.h
@@ -0,0 +1,46 @@
+#ifndef _STDARG_H
+#define _STDARG_H
+
+typedef struct {
+  unsigned int gp_offset; unsigned int fp_offset;
+  void *overflow_arg_area; void *reg_save_area;
+} __va_elem;
+typedef __va_elem va_list;
+typedef va_list __builtin_va_list;
+typedef va_list __gnuc_va_list;
+
+extern void __builtin_va_start(void *ap, void *last);
+#define va_start(ap, last) do { void *_ap = ≈ __builtin_va_start(_ap, last); } while (0)
+#define va_end(ap)
+static void *__va_arg_mem(__va_elem *ap, int sz, int align) {
+  unsigned long p = ap->overflow_arg_area;
+  if (align > 8)
+    p = (p + 15) / 16 * 16;
+  ap->overflow_arg_area = ((unsigned long)p + sz + 7) / 8 * 8;
+  return (void*)p;
+}
+static void *__va_arg_gp(__va_elem *ap, int sz, int align) {
+  if (ap->gp_offset >= 48)
+    return __va_arg_mem(ap, sz, align);
+
+  void *r = ap->reg_save_area + ap->gp_offset;
+  ap->gp_offset += 8;
+  return r;
+}
+static void *__va_arg_fp(__va_elem *ap, int sz, int align) {
+  if (ap->fp_offset >= 112)
+    return __va_arg_mem(ap, sz, align);
+
+  void *r = ap->reg_save_area + ap->fp_offset;
+  ap->fp_offset += 8;
+  return r;
+}
+#define va_arg(ap, ty)                                                  \
+  ({                                                                    \
+    int klass = __builtin_reg_class(ty);                                \
+    *(ty *)(klass == 0 ? __va_arg_gp(&ap, sizeof(ty), _Alignof(ty)) :    \
+            klass == 1 ? __va_arg_fp(&ap, sizeof(ty), _Alignof(ty)) :    \
+            __va_arg_mem(&ap, sizeof(ty), _Alignof(ty)));                \
+  })
+
+#endif