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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 add with carry //
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// //
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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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// Test "Strange issue with r12 after TEQLSP"
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// Tests for bug where testlsp command would switch the core
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// from supervisor into FIRQ mode if it were executed. However the condition is not
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// met so it is not executed. Thje bug is the next instrument works in FIRQ mode anyway.
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// This was caused because the mode bits used in the ececute stage were not conditional on the
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// teq instrumention being executed.
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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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// Test "Strange issue with r12 after TEQLSP"
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mov r1, #0x0
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mov r2, #0x1
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mov r6, #10
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mov r12, #100
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nop
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// this next instrument does not get executed because 'ls' condition is false
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teqlsp r1, r2 // r1 XOR r2 = 0x1 -> sets the mode bits of the PC to 1
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mov r12, r6 // user r12 or FIRQ r12 ?
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cmp r12, r6 // error if user mode r12 was not updated with new value
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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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