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[/] [amber/] [trunk/] [hw/] [tests/] [sbc.S] - Rev 56
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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 64-bit subtractions using sbc (subtract with carry) //
// //
// 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:
mov r12, #0
loop: ldr r0, AdrData1
add r0, r0, r12, lsl #3 @ double-word elements
ldr r1, [r0], #4
ldr r2, [r0]
ldr r3, AdrData2
add r3, r3, r12, lsl #3 @ double-word elements
ldr r4, [r3], #4
ldr r5, [r3]
@ {r1, r2} - {r4, r5}
subs r6, r2, r5
sbc r7, r1, r4
ldr r0, AdrAnswers
add r0, r0, r12, lsl #3 @ double-word elements
ldr r1, [r0], #4
ldr r2, [r0]
cmp r1, r7
movne r10, #10
bne testfail
cmp r2, r6
movne r10, #20
bne testfail
@ increment loop counter
cmp r12, #2
beq testpass
add r12, r12, #1
b loop
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
AdrAnswers: .word Answers
Data1:
@ HiWord, LoWord
.word 0x10000000
.word 0x00000001
.word 0x10000000
.word 0x00000000
.word 0x00000001
.word 0xc8d14800
Data2:
@ HiWord, LoWord
.word 0x08000000
.word 0x00000001
.word 0x08000000
.word 0xffffffff
.word 0x00000000
.word 0x3b9aca00
Answers:
@ HiWord, LoWord
.word 0x08000000
.word 0x00000000
.word 0x07ffffff
.word 0x00000001
.word 0x00000001
.word 0x8d367e00
/* ========================================================================= */
/* ========================================================================= */
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