Add build system scaffolding and libc headers

1 files changed, 27 insertions, 0 deletions

diff --git a/lib/libc/include/libc.h b/lib/libc/include/libc.h
new file mode 100644
index 00000000..3f5f2644
--- /dev/null
+++ b/lib/libc/include/libc.h
@@ -0,0 +1,27 @@
+#ifndef __LIBC_LIBC_H
+#define __LIBC_LIBC_H
+
+#include <__locale.h>
+#include <stdatomic.h>
+
+#define likely(x)     __builtin_expect(!!(x), 1)
+#define unlikely(x)   __builtin_expect(!!(x), 0)
+#define unused	      __attribute__((unused))
+#define aligned(type) __attribute__((aligned(__alignof__(type))))
+#define weak	      __attribute__((__weak__))
+#define weak_reference(old, new) \
+	extern __typeof(old) new __attribute__((__weak__, __alias__(#old)))
+
+static struct {
+	enum {
+		LIBC_ENVP_TOUCHED = 1 << 0,
+	} flags;
+	struct {
+		volatile atomic_flag abort;
+		volatile atomic_flag malloc;
+		volatile atomic_flag environ;
+	} lock;
+	struct __locale_t locale;
+} libc = { .lock = { ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT, ATOMIC_FLAG_INIT } };
+
+#endif