1 files changed, 71 insertions, 0 deletions
diff --git a/sys/boot/mips/uboot/start.S b/sys/boot/mips/uboot/start.S
new file mode 100644
index 0000000..2ca68b2
--- /dev/null
+++ b/sys/boot/mips/uboot/start.S
@@ -0,0 +1,71 @@
+/*-
+ * Copyright (c) 2016 Stanislav Galabov
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <machine/asm.h>
+
+	.text
+	.extern _C_LABEL(main)
+	.weak	_DYNAMIC
+
+/*
+ * Entry point to the loader that U-Boot passes control to.
+ */
+ENTRY(_start)
+	PTR_S	sp, uboot_address
+	j	main
+	nop
+END(_start)
+
+/*
+ * syscall()
+ */
+ENTRY(syscall)
+	PTR_S	ra, ret_address
+	PTR_L	t9, syscall_ptr
+	jalr	t9
+	nop
+	PTR_L	ra, ret_address
+	jr	ra
+	nop
+END(syscall)
+
+/*
+ * Data section
+ */
+	.data
+	.align	8
+	.globl	syscall_ptr
+syscall_ptr:
+	.dword	0
+
+	.globl	uboot_address
+uboot_address:
+	.dword	0
+
+ret_address:
+	.dword	0