ARC port to uClibc

For this port, I would like to give due credit to:

- Folks from Codito technologies (Sameer, Amit, Kanika, Ramana,...)
   who did the very first port

- ARC UK from 2007-2009 (Joern, Irfan, Khurram, Phil...

- Late Brendan Kehoe (may he RIP)

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

1 files changed, 54 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/arc/crt1.S b/libc/sysdeps/linux/arc/crt1.S
new file mode 100644
index 000000000..d78a96dcc
--- /dev/null
+++ b/libc/sysdeps/linux/arc/crt1.S
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <features.h>
+#include <sysdep.h>
+
+.text
+
+#ifndef __UCLIBC_CTOR_DTOR__
+	.weak	_init
+	.weak	_fini
+#endif
+
+/* Stick in a dummy reference to main(), so that if an application
+ * is linking when the main() function is in a static library (.a)
+ * we can be sure that main() actually gets linked in
+ */
+	.type	main,@function
+	.type	_main,@function
+
+
+/* When we enter this piece of code, the program stack looks like this:
+        argc            argument counter (integer)
+        argv[0]         program name (pointer)
+        argv[1...N]     program args (pointers)
+        argv[argc-1]    end of args (integer)
+	NULL
+        env[0...N]      environment variables (pointers)
+        NULL
+*/
+ENTRY(__start)
+	mov	fp, 0
+	ld_s	r1, [sp]	; argc
+
+	mov_s	r5, r0		; rltd_fini
+	add_s	r2, sp, 4	; argv
+
+	mov_s	r0, main
+	mov_s	r3, _init
+	mov	r4, _fini
+
+	and	sp, sp, -8
+	mov	r6, sp
+
+	/* __uClibc_main (main, argc, argv, init, fini, rtld_fini, stack_end) */
+	bl	__uClibc_main
+
+	/* Should never get here....  */
+	flag    1
+END(__start)
+libc_hidden_def(__start)