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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 branch and link instruction //
// //
// 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 r10, #100
mov r1, #37
mov r2, #47
cmp r1, r2
movne r3, #42
moveq r3, #0
mov r5, #0
@ branch and link
blne 1f
ret:
cmp r5, #0xff
movne r10, #10
bne testfail
cmp r1, #37
movne r10, #20
bne testfail
cmp r2, #47
movne r10, #30
bne testfail
cmp r3, #42
movne r10, #40
bne testfail
b testpass
b testfail
b testfail
@ check that the link register gets the correct return address
1: ldr r6, =ret
ldr r7, PCMask
and r7, lr, r7
cmp r6, r7
movne r10, #80
bne testfail
@ check that the value in r5 survives the jump back
mov r5, #0xff
mov pc, lr
b testfail
b testfail
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
PCMask: .word 0x03fffffc
/* ========================================================================= */
/* ========================================================================= */