From 85c0fe762ba9bccf5aa0fd31d8012c958cbf658e Mon Sep 17 00:00:00 2001
From: Megan Wachs <megan@sifive.com>
Date: Mon, 12 Dec 2016 11:49:46 -0800
Subject: Use cleaner .S files

---
 bsp/env/freedom-e300-hifive1/start.S | 115 ++++++++++++++---------------------
 1 file changed, 46 insertions(+), 69 deletions(-)

(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
index c8ec662..2388ec0 100644
--- a/bsp/env/freedom-e300-hifive1/start.S
+++ b/bsp/env/freedom-e300-hifive1/start.S
@@ -1,81 +1,58 @@
-/*-
- * 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
- */
+// See LICENSE for license details.
 
 	.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
+	la gp, _gp
+	la sp, _sp
+
+	/* Load data section */
+	la a0, _data_lma
+	la a1, _data
+	la a2, _edata
+	bgeu a1, a2, 2f
 1:
-	lw	t0, (s2)
-	sw	t0, (s0)
-	addi	s2, s2, 4
-	addi	s0, s0, 4
+	lw t0, (a0)
+	sw t0, (a1)
+	addi a0, a0, 4
+	addi a1, a1, 4
+	bltu a1, a2, 1b
 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
+	/* Clear bss section */
+	la a0, __bss_start
+	la a1, _end
+	bgeu a0, a1, 2f
+1:
+	sw zero, (a0)
+	addi a0, a0, 4
+	bltu a0, a1, 1b
+2:
 
-	/* 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
+	/* Call global constructors */
+	la a0, __libc_fini_array
+	call atexit
+	call __libc_init_array
+
+#ifndef __riscv_float_abi_soft
+	/* Enable FPU */
+	li t0, MSTATUS_FS
+	csrs mstatus, t0
+	csrr t1, mstatus
+	and t1, t1, t0
+	beqz t1, 1f
+	fssr x0
+1:
+#endif
 
-	la	s0, __init_array_start
-	la	s1, __init_array_end
-	move	s2, ra
-	j	ctor_loop_enter
+	call main
+	tail exit
 
-ctor_loop:
-	lw	a0, (s0)
-	addi	s0, s0, 4
-	jalr	a0
-ctor_loop_enter:
-	bne	s0, s1,	ctor_loop
-	move	ra, s2
-	j	_init
+	/* init_array/fini_array are used instead */
+	.globl _init
+	.globl _fini
+_init:
+_fini:
+	ret
-- 
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