URL
https://opencores.org/ocsvn/amber/amber/trunk
Subversion Repositories amber
[/] [amber/] [trunk/] [hw/] [tests/] [bic_bug.S] - Rev 2
Compare with Previous | Blame | View Log
/*****************************************************************
// //
// Amber 2 Core Instruction Test //
// //
// This file is part of the Amber project //
// http://www.opencores.org/project,amber //
// //
// Description //
// Test added to catch specific bug with bic during Linux //
// kernel_init. The following instruction stored the result //
// in r3, instead of r2 //
// c00b229c: e1120310 tst r2, r0, lsl r3 //
// c00b22a0: 11c22310 bicne r2, r2, r0, lsl r3 //
// //
// 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:
/* bicne r2, r2, r0, lsl r3 with r3 = 0 */
mov r3, #0
mov r0, #0x01
mov r2, #0xff
tst r2, r0, lsl r3 /* r2 and ( r0 << r3 ) */
bicne r2, r2, r0, lsl r3
cmp r2, #0xfe
movne r10, #10
bne testfail
cmp r3, #0x0
movne r10, #20
bne testfail
/* bicne r2, r2, r0, lsl r3 with r3 = 1 */
mov r3, #1
mov r2, #0xff
tst r2, r0, lsl r3 /* r2 and ( r0 << r3 ) */
bicne r2, r2, r0, lsl r3
cmp r2, #0xfd
movne r10, #30
bne testfail
cmp r3, #0x1
movne r10, #40
bne testfail
/* bicne r2, r2, r0, lsl r3 with r3 = 1, r2 = 0xf0 */
/* So bit 1 of r2 is already a zero, the bic should
not execute */
mov r3, #1
mov r2, #0xf0
tst r2, r0, lsl r3 /* r2 and ( r0 << r3 ) */
bicne r2, r2, r0, lsl r3
movne r2, #0x00 /* add the mov here, just so I can verify
that the NE condition is false and neither
bic or mov execute */
cmp r2, #0xf0
movne r10, #50
bne testfail
cmp r3, #0x1
movne r10, #60
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
/* ========================================================================= */
/* ========================================================================= */