summaryrefslogtreecommitdiff
path: root/bsp/env/freedom-e300-arty/entry.S
diff options
context:
space:
mode:
Diffstat (limited to 'bsp/env/freedom-e300-arty/entry.S')
-rw-r--r--bsp/env/freedom-e300-arty/entry.S81
1 files changed, 81 insertions, 0 deletions
diff --git a/bsp/env/freedom-e300-arty/entry.S b/bsp/env/freedom-e300-arty/entry.S
new file mode 100644
index 0000000..c8ec662
--- /dev/null
+++ b/bsp/env/freedom-e300-arty/entry.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