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// SPDX-License-Identifier: Apache-2.0
// Copyright 2019 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.
//
// Assembly code for Hello World
// Not using only ALU ops for creating the string
#include "defines.h"
#define STDOUT 0xd0580000
// Code to execute
.section .text
.global _start
_start:
// Clear minstret
csrw minstret, zero
csrw minstreth, zero
//li x1, 0x5f555555
//csrw 0x7c0, x1
li x1, 4
csrw 0x7f9, x1
li x8, 0xf0040000 // dccm address
li x3, STDOUT
li x13, 0x1 // the number whose factorial needs to be calculated 1 till 10
addi x9, x0, 0xA
addi x6, x0, 0
addi x11, x0, 1 // initial value
addi x12, x0, 1
nop
store:
add x5, x0, x6
sw x5, 0(x8)
addi x6, x6, 1
addi x8, x8, 4
bne x9, x6, store
li x8, 0xf0040000
j factorial_loop
next:
sw x11, 0(x8)
addi x8, x8, 4
sw x11, 0(x3)
addi x3, x3, 4
beq x13, x9, _finish
addi x13, x13, 1
addi x11, x0, 1
addi x12, x0, 1
factorial_loop:
mul x11, x11, x12
beq x12, x13, next
addi x12,x12,1
j factorial_loop
// Write 0xff to STDOUT for TB to termiate test.
_finish:
li x3, STDOUT
addi x5, x0, 0xff
sb x5, 0(x3)
beq x0, x0, _finish
.rept 100
nop
.endr