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csantifort |
/*****************************************************************
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// //
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// Amber 2 Core Instruction Test //
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// //
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// This file is part of the Amber project //
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// http://www.opencores.org/project,amber //
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// //
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// Description //
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// Tests mov with RRX //
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// Checks that the carry flag value is rotated into //
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// target register //
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// Author(s): //
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// - Conor Santifort, csantifort.amber@gmail.com //
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// //
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//////////////////////////////////////////////////////////////////
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// //
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// Copyright (C) 2010 Authors and OPENCORES.ORG //
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// //
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// This source file may be used and distributed without //
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// restriction provided that this copyright statement is not //
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// removed from the file and that any derivative work contains //
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// the original copyright notice and the associated disclaimer. //
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// //
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// This source file is free software; you can redistribute it //
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// and/or modify it under the terms of the GNU Lesser General //
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// Public License as published by the Free Software Foundation; //
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// either version 2.1 of the License, or (at your option) any //
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// later version. //
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// //
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// This source is distributed in the hope that it will be //
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// useful, but WITHOUT ANY WARRANTY; without even the implied //
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// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //
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// PURPOSE. See the GNU Lesser General Public License for more //
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// details. //
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// //
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// You should have received a copy of the GNU Lesser General //
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// Public License along with this source; if not, download it //
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// from http://www.opencores.org/lgpl.shtml //
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// //
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*****************************************************************/
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#include "amber_registers.h"
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#include "amber_macros.h"
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.section .text
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.globl main
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main:
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// sets the carry big
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// Cant use p version of instrustion in 32-bit CPU because it writes the upper 4 bits of PC
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teqp pc, #0x20000000
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mov r0, #0
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// without the 's' the rotation does not change the carry flag
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mov r0, r0, rrx
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// carry flag should still be set
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bcc testfail
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// check that r0 got the carry flag into bit 31
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cmp r0, #0x80000000
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bne testfail
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// same again, except with movs so the carry flag gets set to bit 0 of r0
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mov r0, #0
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movs r0, r0, rrx
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// carry flag should be cleared now
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bcs testfail
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// check that r0 got the carry flag into bit 31
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cmp r0, #0x80000000
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bne testfail
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// check that carry flag can be set to 1 with same sequence
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mov r0, #1
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teqp pc, #0x00000000
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bcs testfail
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movs r0, r0, rrx
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bcc testfail
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cmp r0, #0x00000000
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bne testfail
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b testpass
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testfail:
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ldr r11, AdrTestStatus
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str r10, [r11]
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b testfail
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testpass:
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ldr r11, AdrTestStatus
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mov r10, #17
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str r10, [r11]
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b testpass
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AdrTestStatus: .word ADR_AMBER_TEST_STATUS
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