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[/] [amber/] [trunk/] [hw/] [tests/] [strb.S] - Rev 40
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/*****************************************************************
// //
// Amber 2 Core Instruction Test //
// //
// This file is part of the Amber project //
// http://www.opencores.org/project,amber //
// //
// Description //
// Tests str and strb with different indexing modes. //
// //
// Author(s): //
// - Conor Santifort, csantifort.amber@gmail.com //
// //
//////////////////////////////////////////////////////////////////
// //
// Copyright (C) 2010 Authors and OPENCORES.ORG //
// //
// This source file may be used and distributed without //
// restriction provided that this copyright statement is not //
// removed from the file and that any derivative work contains //
// the original copyright notice and the associated disclaimer. //
// //
// This source file is free software; you can redistribute it //
// and/or modify it under the terms of the GNU Lesser General //
// Public License as published by the Free Software Foundation; //
// either version 2.1 of the License, or (at your option) any //
// later version. //
// //
// This source is distributed in the hope that it will be //
// useful, but WITHOUT ANY WARRANTY; without even the implied //
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //
// PURPOSE. See the GNU Lesser General Public License for more //
// details. //
// //
// You should have received a copy of the GNU Lesser General //
// Public License along with this source; if not, download it //
// from http://www.opencores.org/lgpl.shtml //
// //
*****************************************************************/
#include "amber_registers.h"
.section .text
.globl main
main:
/* Store single Byte */
ldr r0, StoreBase
add r0, r0, #4
mov r4, #0
str r4, [r0]
ldr r1, Data1
strb r1, [r0]
and r3, r1, #0xff
ldr r2, [r0]
cmp r3, r2
movne r10, #10 @ error number
bne testfail
/* Store Byte at address 1, 2 and 3 */
ldr r0, StoreBase
add r0, r0, #8
mov r4, #0
@ start by writing a word of 0 to the memory location
str r4, [r0], #1
ldr r1, Data1
@ then store byte 0 in r1 to 3 positions
@ in the memory location
strb r1, [r0], #1
strb r1, [r0], #1
strb r1, [r0], #1
@ load back the memory location and check its contents
ldr r0, StoreBase
ldr r2, [r0, #8]
ldr r3, Data3
cmp r2, r3
movne r10, #20 @ error number
bne testfail
/* Reverse order of bytes */
@ read in Data1 and store it out to
@ StoreBase + 12, reversing the order
@ of the bytes
ldr r2, StoreBase
add r2, r2, #12
ldr r1, Data1
@ store byte 3
mov r1, r1, ror #24
strb r1, [r2], #1
@ store byte 2
mov r1, r1, ror #24
strb r1, [r2], #1
@ store byte 1
mov r1, r1, ror #24
strb r1, [r2], #1
@ store byte 0
mov r1, r1, ror #24
strb r1, [r2], #1
ldr r2, StoreBase
add r2, r2, #12
ldr r3, [r2]
ldr r4, Data4
cmp r3, r4
movne r10, #30
bne testfail
/* Store word */
ldr r0, StoreBase
ldr r1, Data1
str r1, [r0]
ldr r2, [r0]
cmp r1, r2
movne r10, #50 @ error number
bne testfail
@ ------------------------------------------
@ ------------------------------------------
b testpass
testfail:
ldr r11, AdrTestStatus
str r10, [r11]
b testfail
testpass:
ldr r11, AdrTestStatus
mov r10, #17
str r10, [r11]
b testpass
/* Write 17 to this address to generate a Test Passed message */
AdrTestStatus: .word ADR_AMBER_TEST_STATUS
AdrData1: .word Data1
AdrData2: .word Data2
StoreBase: .word 0x800
Data1: .word 0x12345678
Data2: .word 0xffccbbaa
Data3: .word 0x78787800
Data4: .word 0x78563412
/* ========================================================================= */
/* ========================================================================= */
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