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/*-
* 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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