Add support for TLS in the libc

1 files changed, 48 insertions, 0 deletions

diff --git a/lib/libc/internal/include/libc.h b/lib/libc/internal/include/libc.h
new file mode 100644
index 00000000..f06fa6d8
--- /dev/null
+++ b/lib/libc/internal/include/libc.h
@@ -0,0 +1,48 @@
+#ifndef __LIBC_LIBC_H
+#define __LIBC_LIBC_H
+
+#include <stdatomic.h>
+#include <stddef.h>
+#include <sys/cdefs.h>
+
+#define weak_reference(old, new) extern __typeof(old)((new)) __attribute__((__weak__, __alias__(#old)))
+
+struct tls {
+	struct tls *next;
+	void *data;
+	size_t size;
+	size_t align;
+	size_t length;
+	size_t offset;
+};
+
+struct libc {
+	size_t auxv[32];
+	struct {
+		void *base;
+		size_t size;
+	} tls;
+
+	enum {
+		LIBC_ENVP_TOUCHED = 1 << 0,
+	} flags;
+
+	struct {
+		volatile atomic_flag abort;
+		volatile atomic_flag malloc;
+		volatile atomic_flag environ;
+	} lock;
+};
+
+extern struct libc __libc;
+
+#define panic(__errmsg) __libc_panic(__FILE__ ":" __STRING(__LINE__) ": ", __PRETTY_FUNCTION__, ": " __STRING(__errmsg))
+
+#define panic_if(__cond, __errmsg)           \
+	do {                                 \
+		if (__predict_false(__cond)) \
+			panic(__errmsg);     \
+	} while (0)
+
+__dead void __libc_panic(const char *, const char *, const char *);
+#endif