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/* is-lws-test.S. l.lws instruction test of Or1ksim
 * 
 * Copyright (C) 1999-2006 OpenCores
 * Copyright (C) 2010 Embecosm Limited
 * 
 * Contributors various OpenCores participants
 * Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
 * 
 * This file is part of OpenRISC 1000 Architectural Simulator.
 * 
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 3 of the License, or (at your option)
 * any later version.
 * 
 * This program 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 General Public License for
 * more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program.  If not, see <http:  www.gnu.org/licenses/>.
 */

/* ----------------------------------------------------------------------------
 * Coding conventions
 *
 * A simple rising stack is provided starting at _stack and pointed to by
 * r1. r1 points to the next free word. Only 32-bit registers may be pushed
 * onto the stack.
 *
 * Local labels up to 49 are reserved for macros. Each is used only once in
 * all macros. You can get in a serious mess if you get local label clashing
 * in macros.
 *
 * Arguments to functions are passed in r3 through r8.
 * r9 is the link (return address)
 * r11 is for returning results
 *
 * Only r1 and r2 are preserved across function calls. It is up to the callee
 * to save any other registers required.
 * ------------------------------------------------------------------------- */

/* ----------------------------------------------------------------------------
 * Test coverage
 *
 * The l.lws instruction was omitted from Or1ksim originally. It is specified
 * for ORBIS32, even though it is functionally equivalent to l.lwz.
 *
 * Having fixed the problem, this is (in good software engineering style), a
 * regresison test to go with the fix.
 *
 * Of course what is really needed is a comprehensive instruction test...
 * ------------------------------------------------------------------------- */


#include "inst-set-test.h"

/* ----------------------------------------------------------------------------
 * Test of load single word and extend with sign: l.lws
 * ------------------------------------------------------------------------- */
        .section .rodata
        .balign 4
50:     .word   0xdeadbeef
51:     .word   0x00000000
52:     .word   0x7fffffff
53:     .word   0x80000000
54:     .word   0xffffffff

        .section .text
        .global _start
_start:
        LOAD_STR (r3, "l.lws\n")
        l.jal   _puts
        l.nop

        /* Load with zero offset */
        LOAD_CONST (r5,50b)
        l.lws   r4,0(r5)
        CHECK_RES (" l.lws r4,0(r5): r4=0xdeadbeef:  ", r4, 0xdeadbeef)
        
        LOAD_CONST (r5,51b)
        l.lws   r4,0(r5)
        CHECK_RES (" l.lws r4,0(r5): r4=0x00000000:  ", r4, 0x00000000)
        
        LOAD_CONST (r5,52b)
        l.lws   r4,0(r5)
        CHECK_RES (" l.lws r4,0(r5): r4=0x7fffffff:  ", r4, 0x7fffffff)
        
        LOAD_CONST (r5,53b)
        l.lws   r4,0(r5)
        CHECK_RES (" l.lws r4,0(r5): r4=0x80000000:  ", r4, 0x80000000)
        
        LOAD_CONST (r5,54b)
        l.lws   r4,0(r5)
        CHECK_RES (" l.lws r4,0(r5): r4=0xffffffff:  ", r4, 0xffffffff)

        /* Load with positive offset */
        LOAD_CONST (r5,50b)
        l.lws   r4,4(r5)
        CHECK_RES (" l.lws r4,0(r5): r4=0x00000000:  ", r4, 0x00000000)
        
        LOAD_CONST (r5,50b)
        l.lws   r4,8(r5)
        CHECK_RES (" l.lws r4,0(r5): r4=0x7fffffff:  ", r4, 0x7fffffff)
        
        LOAD_CONST (r5,50b)
        l.lws   r4,12(r5)
        CHECK_RES (" l.lws r4,0(r5): r4=0x80000000:  ", r4, 0x80000000)
        
        LOAD_CONST (r5,50b)
        l.lws   r4,16(r5)
        CHECK_RES (" l.lws r4,0(r5): r4=0xffffffff:  ", r4, 0xffffffff)

        /* Load with negative offset */
        LOAD_CONST (r5,54b)
        l.lws   r4,-16(r5)
        CHECK_RES (" l.lws r4,0(r5): r4=0xdeadbeef:  ", r4, 0xdeadbeef)
        
        LOAD_CONST (r5,54b)
        l.lws   r4,-12(r5)
        CHECK_RES (" l.lws r4,0(r5): r4=0x00000000:  ", r4, 0x00000000)
        
        LOAD_CONST (r5,54b)
        l.lws   r4,-8(r5)
        CHECK_RES (" l.lws r4,0(r5): r4=0x7fffffff:  ", r4, 0x7fffffff)
        
        LOAD_CONST (r5,54b)
        l.lws   r4,-4(r5)
        CHECK_RES (" l.lws r4,0(r5): r4=0x80000000:  ", r4, 0x80000000)

/* ----------------------------------------------------------------------------
 * All done
 * ------------------------------------------------------------------------- */
_exit:
        LOAD_STR (r3, "Test completed\n")
        l.jal   _puts
        l.nop

        TEST_EXIT