quasar/testbench/asm/crt0.s

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2021-03-29 13:09:22 +08:00
# SPDX-License-Identifier: Apache-2.0
# Copyright 2020 Western Digital Corporation or its affiliates.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
// startup code to support HLL programs
#include "defines.h"
.section .text.init
.global _start
_start:
// enable caching, except region 0xd
li t0, 0x59555555
csrw 0x7c0, t0
la sp, STACK
call main
.global _finish
_finish:
la t0, tohost
li t1, 0xff
sb t1, 0(t0) // DemoTB test termination
li t1, 1
sw t1, 0(t0) // Whisper test termination
beq x0, x0, _finish
.rept 10
nop
.endr
.section .data.io
.global tohost
tohost: .word 0