From c6998b204d3d817a6c2cd0eeb020fd89b09b372e Mon Sep 17 00:00:00 2001
From: Megan Wachs <megan@sifive.com>
Date: Fri, 9 Dec 2016 15:42:45 -0800
Subject: demo_gpio: Correct trap_entry handling to enable timer/ext interrupts

---
 bsp/env/freedom-e300-hifive1/start.S | 81 ++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 bsp/env/freedom-e300-hifive1/start.S

(limited to 'bsp/env/freedom-e300-hifive1/start.S')

diff --git a/bsp/env/freedom-e300-hifive1/start.S b/bsp/env/freedom-e300-hifive1/start.S
new file mode 100644
index 0000000..c8ec662
--- /dev/null
+++ b/bsp/env/freedom-e300-hifive1/start.S
@@ -0,0 +1,81 @@
+/*-
+ * Copyright (c) 2013-2015 Marko Zec, University of Zagreb
+ *
+ * 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.
+ *
+ * $Id$
+ */
+
+/*
+ * Copy data, clear BSS, set small data index register and jump into main().
+ *
+ * Assumes that the loader has already properly:
+ * 1) set stack pointer
+ * 2) set return address
+ * 3) invalidated caches
+ */
+
+	.section .init
+	.globl _start
+	.type _start,@function
+
+_start:
+	la	gp, _gp
+	la	sp, _sp
+
+	/* Load data sections */
+	la	s0, _data
+	la	s1, _edata
+	la	s2, _data_lma
+	j	2f
+1:
+	lw	t0, (s2)
+	sw	t0, (s0)
+	addi	s2, s2, 4
+	addi	s0, s0, 4
+2:
+	bltu	s0, s1, 1b
+
+	la	s1, _end	/* End of BSS section, word aligned */
+	la	s0, __bss_start	/* Start of BSS section, word aligned */
+	j	bss_bzero_enter
+
+	/* The loader doesn't bzero the BSS, so we must do it here. */
+bss_bzero_loop:
+	sw	zero, (s0)
+	addi	s0, s0, 4
+bss_bzero_enter:
+	bne	s0, s1, bss_bzero_loop
+
+	la	s0, __init_array_start
+	la	s1, __init_array_end
+	move	s2, ra
+	j	ctor_loop_enter
+
+ctor_loop:
+	lw	a0, (s0)
+	addi	s0, s0, 4
+	jalr	a0
+ctor_loop_enter:
+	bne	s0, s1,	ctor_loop
+	move	ra, s2
+	j	_init
-- 
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