2 files changed, 93 insertions, 0 deletions
diff --git a/system/lib/libc/musl/src/internal/libc.c b/system/lib/libc/musl/src/internal/libc.c
new file mode 100644
index 00000000..942f6b44
--- /dev/null
+++ b/system/lib/libc/musl/src/internal/libc.c
@@ -0,0 +1,22 @@
+#include "libc.h"
+
+#ifdef USE_LIBC_ACCESSOR
+struct __libc *__libc_loc()
+{
+	static struct __libc __libc;
+	return &__libc;
+}
+#else
+struct __libc __libc;
+#endif
+
+#ifdef BROKEN_VISIBILITY
+__asm__(".hidden __libc");
+#endif
+
+size_t __hwcap;
+size_t __sysinfo;
+char *__progname=0, *__progname_full=0;
+
+weak_alias(__progname, program_invocation_short_name);
+weak_alias(__progname_full, program_invocation_name);
diff --git a/system/lib/libc/musl/src/internal/libc.h b/system/lib/libc/musl/src/internal/libc.h
new file mode 100644
index 00000000..c9416f07
--- /dev/null
+++ b/system/lib/libc/musl/src/internal/libc.h
@@ -0,0 +1,71 @@
+#ifndef LIBC_H
+#define LIBC_H
+
+#include <stdlib.h>
+#include <stdio.h>
+
+struct __libc {
+	void *main_thread;
+	int threaded;
+	int secure;
+	size_t *auxv;
+	int (*atexit)(void (*)(void));
+	void (*fini)(void);
+	void (*ldso_fini)(void);
+	volatile int threads_minus_1;
+	int canceldisable;
+	FILE *ofl_head;
+	int ofl_lock[2];
+	size_t tls_size;
+};
+
+extern size_t __hwcap;
+
+#if !defined(__PIC__) || (100*__GNUC__+__GNUC_MINOR__ >= 303 && !defined(__PCC__))
+
+#ifdef __PIC__
+#if __GNUC__ < 4
+#define BROKEN_VISIBILITY 1
+#endif
+#define ATTR_LIBC_VISIBILITY __attribute__((visibility("hidden")))
+#else
+#define ATTR_LIBC_VISIBILITY
+#endif
+
+extern struct __libc __libc ATTR_LIBC_VISIBILITY;
+#define libc __libc
+
+#else
+
+#define USE_LIBC_ACCESSOR
+#define ATTR_LIBC_VISIBILITY
+extern struct __libc *__libc_loc(void) __attribute__((const));
+#define libc (*__libc_loc())
+
+#endif
+
+
+/* Designed to avoid any overhead in non-threaded processes */
+void __lock(volatile int *) ATTR_LIBC_VISIBILITY;
+void __unlock(volatile int *) ATTR_LIBC_VISIBILITY;
+int __lockfile(FILE *) ATTR_LIBC_VISIBILITY;
+void __unlockfile(FILE *) ATTR_LIBC_VISIBILITY;
+#define LOCK(x) (libc.threads_minus_1 ? (__lock(x),1) : ((void)(x),1))
+#define UNLOCK(x) (libc.threads_minus_1 ? (__unlock(x),1) : ((void)(x),1))
+
+void __synccall(void (*)(void *), void *);
+int __setxid(int, int, int, int);
+
+extern char **__environ;
+
+#undef weak_alias
+#define weak_alias(old, new) \
+	extern __typeof(old) new __attribute__((weak, alias(#old)))
+
+#undef LFS64_2
+#define LFS64_2(x, y) weak_alias(x, y)
+
+#undef LFS64
+#define LFS64(x) LFS64_2(x, x##64)
+
+#endif