crt0.S
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/*
* Copyright (c) 2017, Cobham Gaisler AB
* All rights reserved.
*
* 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
#include <macros.i>
.section ".text"
.global __bcc_crt0
/*
* At entry to __crt0_entry, the following is assumed:
* - %sp points to top of stack
* - %wim and %psr.cwp are valid
* - %psr.et=1
*/
FUNC_BEGIN __bcc_crt0
call __bcc_init50
/* NOTE: Assuming %sp is already set by boot loader. */
mv s0, sp
/*
* If the symbol __bcc_cfg_skip_clear_bss has non-zero value, then
* clear .bss. Otherwise do not clear .bss.
*/
la t0, __bcc_cfg_skip_clear_bss
bnez t0, .Lskip_clear_bss
/* Clear bss */
la a0, __bss_start
la a2, __bss_end
/* Number of double words. */
sub a3, a2, a0
srl a1, a3, 3
call bcc_dwzero
.Lskip_clear_bss:
la t0, __bcc_sp_at_entry
SREG s0, 0(t0)
/*
* Copy .data from Load Memory Address (LMA) to Virtual Memory Address
* (VMA) if needed.
*/
call __bcc_copy_data
/* .data can be referenced only after return from __bcc_copy_data(). */
call __bcc_init60
#if 0
call __bcc_get_leon_info
#endif
call __bcc_con_init
call __bcc_timer_init
call __bcc_int_init
la a0, __libc_fini_array
call atexit
call __libc_init_array
call __bcc_init70
la t0, __bcc_argc
lw a0, 0(t0)
la t0, __bcc_argvp
LREG a1, 0(t0)
/* In case someone tries to reach environment. */
mv a2, zero
call main
call exit
ebreak
FUNC_END __bcc_crt0
.section .bss
.global __bcc_sp_at_entry
.align 8
__bcc_sp_at_entry:
.dword 0