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[/] [amber/] [trunk/] [hw/] [tests/] [mlas_bug.S] - Rev 2
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/*****************************************************************
// //
// Amber 2 Core Instruction Test //
// //
// This file is part of the Amber project //
// http://www.opencores.org/project,amber //
// //
// Description //
// Bug with Multiply Accumulate. The flags were gettting set //
// 1 cycle early. So in an operation with ( 0 x n ) + 1, the //
// Z flag was set because it didn't take into account the //
// addition done right at the end. //
// //
// 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:
@ r6 = mode
@ r3 = inode->i_mode
@ setup
mov r0, #0
mov r1, #4
@ -------------------------------------
@ Replicated code from Linux Kernel
@ chip.c / set_irq_chip
stmda sp,{r4, r5, r6, lr}
ldr r3, [pc, #120] @ 2e53ac <set_irq_chip+0x84>
ldr r3, [r3]
cmp r0, r3
mov r5, r1
bcs j1
ldr r2, [pc, #104] @ 2e53b0 <set_irq_chip+0x88>
mov r3, #60 @ 0x3c
mlas r6, r0, r3, r2 @ if result == 0 -> warn_slowpath
bne j2
j1:
mov r3, r0
mov r1, #95 @ 0x5f
ldr r0, [pc, #84] @ 2e53b4 <set_irq_chip+0x8c>
ldr r2, [pc, #84] @ 2e53b8 <set_irq_chip+0x90>
bl warn_slowpath
mvn r0, #21 @ 0x15
ldmib sp, {r4, r5, r6, pc}
j2:
ldr r3, [pc, #72] @ 2e53bc <set_irq_chip+0x94>
cmp r1, #0 @ 0x0
moveq r5, r3
mov r4, pc
orr r3, r4, #128 @ 0x80
teqp pc, r3
mov r0, r5
bl irq_chip_set_defaults
ands r0, r4, #128 @ 0x80
str r5, [r6, #8]
beq j3
teqp pc, r4
mov r0, #0 @ 0x0
ldmib sp, {r4, r5, r6, pc}
j3:
teqp pc, r4
ldmib sp, {r4, r5, r6, pc}
.word nr_irqs
.word 0xc04c6ce4
.word 0xc0482c14
.word 0xc0482c28
.word 0xc04c77e8
nr_irqs:
.word 47
b testpass
@ -------------------------------------
warn_slowpath:
mov r10, #20
b testfail
irq_chip_set_defaults:
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
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