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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 sub and subs //
// //
// Author(s): //
// - Conor Santifort, csantifort.amber@gmail.com //
// //
/*****************************************************************
// //
// Amber 2 Core Instruction Test //
// //
// This file is part of the Amber project //
// http://www.opencores.org/project,amber //
// //
// Description //
// Tests sub and subs instructions //
// //
// 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:
ldr r0, =Data1
ldr r6, Data2
ldr lr, =1f
mov pc, lr
@ Test subs
1: ldr r3, [r0]
subs r2, r3, #1
cmpcs r2, r6
movcs r3, #0
cmp r3, #0
movne r10, #10
bne testfail
@ Test sub
/* 1 - 0x7fffffff */
ldr r1, MaxPos
mov r2, #1
sub r3, r2, r1
ldr r4, MaxNeg
add r4, r4, #2
cmp r4, r3
movne r10, #20
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
MaxPos: .word 0x7fffffff
MaxNeg: .word 0x80000000
Data1: .word 0x03000000
Data2: .word 0x020febed
/* ========================================================================= */
/* ========================================================================= */