From 15ad5fcfe5cf9e57dfcddad144a9364de2d7d0f5 Mon Sep 17 00:00:00 2001
From: Albert Ou <albert@sifive.com>
Date: Wed, 14 Dec 2016 17:15:14 -0800
Subject: Move start.S and entry.S to a common directory

---
 bsp/env/start.S | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 bsp/env/start.S

(limited to 'bsp/env/start.S')

diff --git a/bsp/env/start.S b/bsp/env/start.S
new file mode 100644
index 0000000..77e223d
--- /dev/null
+++ b/bsp/env/start.S
@@ -0,0 +1,51 @@
+// See LICENSE for license details.
+
+	.section .init
+	.globl _start
+	.type _start,@function
+
+_start:
+	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, (a0)
+	sw t0, (a1)
+	addi a0, a0, 4
+	addi a1, a1, 4
+	bltu a1, a2, 1b
+2:
+
+	/* 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:
+
+	/* 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
+
+	call main
+	tail exit
-- 
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