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/*
        OR1200 overflow bit checking
 
        Very basic, testing
 
TODO:    Check range exception handling in delay slots
 
        Julius Baxter, ORSoC AB, julius.baxter@orsoc.se
 
*/
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2011 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 "spr-defs.h"
#include "board.h"
#include "or1200-defines.h"
 
 
/* =================================================== [ exceptions ] === */
        .section .vectors, "ax"
 
 
/* ---[ 0x100: RESET exception ]----------------------------------------- */
        .org 0x100
        l.movhi r0, 0
        /* Clear status register */
        l.ori r1, r0, SPR_SR_SM
        l.mtspr r0, r1, SPR_SR
        /* Clear timer  */
        l.mtspr r0, r0, SPR_TTMR
 
        /* Jump to program initialisation code */
        .global _start
        l.movhi r4, hi(_start)
        l.ori r4, r4, lo(_start)
        l.jr    r4
        l.nop
 
        .org 0x600
        l.nop 0x1
 
 
/* ---[ 0x700: Illegal instruction exception ]-------------------------- */
        .org 0x700
#ifndef OR1200_IMPL_ADDC
        // No problem - instruction not supported
        l.movhi r3, hi(0x8000000d)
        l.ori   r3, r3, lo(0x8000000d)
        l.nop   0x2
        l.ori   r3, r0, 0
#else
        l.ori   r3, r0, 1
#endif
        l.nop   0x1
 
#define INCREMENT_EXCEPTION_COUNTER     l.addi r11, r11, 0x1
#define CHECK_EXCEPTION_COUNTER         \
        l.sfne  r11, r12        ;       \
        l.bf    _fail           ;       \
        l.nop                   ;
#define EXPECT_RANGE_EXCEPT             \
        l.addi  r12, r12, 1     ;       \
        CHECK_EXCEPTION_COUNTER
 
/* ---[ 0xb00: Range exception ]---------------------------------------- */
        .org 0xb00
        l.sw    0(r0), r3       ;// Save r3 - don't disrupt it during exceptions
        l.ori   r3, r0, 0xaaee
        l.nop   0x2
        // TODO - get instruction and decode to ensure it was an instruction
        // which is capable of causing a range exception. Remember delay slot!
        INCREMENT_EXCEPTION_COUNTER
 
        // Clear OV in ESR
        l.mfspr r3,r0,SPR_ESR_BASE      ;// Get ESR
        l.nop   2
        l.xori  r3, r3,SPR_SR_OV        ;// Clear OV bit
        l.mtspr r0,r3,SPR_ESR_BASE      ;// Get EPC
 
        l.mfspr r3,r0,SPR_EPCR_BASE     ;// Get EPC
        l.nop   2
        l.addi  r3, r3, 0x4             ;// Increment
        l.mtspr r0,r3,SPR_EPCR_BASE     ;// Get EPC
        // For now, increment EPCR so we step over instruction and continue
 
        l.lwz   r3, 0(r0)
        l.rfe
 
/* =================================================== [ text ] === */
        .section .text
 
/* =================================================== [ start ] === */
 
        .global _start
_start:
        // Clear all regs
        l.movhi r1, 0
        l.movhi r2, 0
        l.movhi r3, 0
        l.movhi r4, 0
        l.movhi r5, 0
        l.movhi r6, 0
        l.movhi r7, 0
        l.movhi r8, 0
        l.movhi r9, 0
        l.movhi r10, 0
        l.movhi r11, 0
        l.movhi r12, 0
        l.movhi r13, 0
        l.movhi r14, 0
        l.movhi r15, 0
        l.movhi r16, 0
        l.movhi r17, 0
        l.movhi r18, 0
        l.movhi r19, 0
        l.movhi r20, 0
        l.movhi r21, 0
        l.movhi r22, 0
        l.movhi r23, 0
        l.movhi r24, 0
        l.movhi r25, 0
        l.movhi r26, 0
        l.movhi r27, 0
        l.movhi r28, 0
        l.movhi r29, 0
        l.movhi r30, 0
        l.movhi r31, 0
 
#ifdef OR1200_IMPL_OV
        // Kick off test
        l.jal   _main
#else
        // Not supported, exit test
        l.j     _finish
#endif
        l.nop
 
 
/* =================================================== [ main ] === */
 
 
#define CHECK_OV_CLEAR                  \
        l.mfspr r20, r0, SPR_SR ;       \
        l.andi  r21, r20, SPR_SR_OV ;   \
        l.sfne  r21, r0           ;     \
        l.bf    _fail             ;     \
        l.nop
 
#define CHECK_OV_SET                    \
        l.mfspr r20, r0, SPR_SR ;       \
        l.andi  r21, r20, SPR_SR_OV ;   \
        l.sfnei r21, SPR_SR_OV    ;     \
        l.bf    _fail             ;     \
        l.addi  r12, r12, 0x1     ;     // Increment expected counter
 
        .global _main
_main:
 
        // Set up some values, check the OV bit is cleared
        CHECK_OV_CLEAR
 
        l.movhi r4, 0x7fff
        l.ori   r4, r4, 0xefff
 
        l.ori   r5, r0, 0xffff
 
        l.add   r3, r5, r4      ;// Should set overflow
        l.nop   0x2
        CHECK_OV_SET
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_OV_CLEAR
 
        l.addi  r3, r4, 0x7fff  ;// Should set overflow
        l.nop   0x2
        CHECK_OV_SET
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_OV_CLEAR
 
        // Now test negative numbers
 
        l.movhi r4, 0x8000
        l.ori   r4, r4, 0x0000
 
        l.movhi r5, 0xffff
        l.ori   r5, r5, 0xffff
 
        l.add   r3, r4, r5      // Biggest and smallest negative number
        l.nop   0x2
        CHECK_OV_SET
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_OV_CLEAR
 
        l.addi  r3, r4, 0xffff  // Biggest and smallest negative number
        l.nop   0x2
        CHECK_OV_SET
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_OV_CLEAR
 
        l.add   r3, r4, r0      // Biggest negative number, and zero
        l.nop   0x2
        CHECK_OV_CLEAR
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_OV_CLEAR
 
        l.movhi r5, 0xffff
        l.ori   r5, r5, 0xfffe
 
        l.add   r3, r4, r5      // Biggest and second smallest negative number
        l.nop   0x2
        CHECK_OV_SET
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_OV_CLEAR
 
#ifdef OR1200_IMPL_SUB
 
        // report indicator that we're at l.sub section 0x55555555
        l.movhi r3, 0x5555
        l.ori   r3, r3, 0x5555
        l.nop   0x2
 
        // Quick subtract check
        // Check largest negative number -1 tripping overflow
        l.ori   r5, r0, 1               ; // +1
        l.sub   r3, r4, r5              ; // -2147483647 - 1
        l.nop   0x2
        CHECK_OV_SET
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_OV_CLEAR
#endif
 
        l.movhi r4, 0x8000
        l.ori   r4, r4, 0x0437
 
        l.movhi r5, 0xffff
        l.ori   r5, r5, 0xfbc7
 
        l.add   r3, r4, r5      // Very big negative number, another one big
                                // enough to cause overflow hopefully
        l.nop   0x2
        CHECK_OV_SET
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_OV_CLEAR
 
        l.movhi r5, 0xffff
        l.ori   r5, r5, 0xfff7
 
        l.add   r3, r4, r5      // Two negative numbers but shouldn't overflow
        l.nop   0x2
        CHECK_OV_CLEAR
 
#ifdef OR1200_DIV_IMPLEMENTED
 
        // report indicator that we're at l.div section 0xdddddddd
        l.movhi r3, 0xdddd
        l.ori   r3, r3, 0xdddd
        l.nop   0x2
 
        // Test divide by zero
        l.div   r3, r5, r0
        l.nop   0x2
 
        l.sfne  r3, r0          ;// Check result was 0
        l.bf    _fail
 
        CHECK_OV_SET
 
        l.add   r3, r5, r0      ;// Should clear overflow
        l.nop   0x2
 
        CHECK_OV_CLEAR
 
        // Test divide by zero
        l.divu  r3, r0, r0
        l.nop   0x2
        CHECK_OV_SET
 
        l.sfne  r3, r0          ;// Check result was 0
        l.bf    _fail
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_OV_CLEAR
 
#endif
 
#ifdef OR1200_MULT_IMPLEMENTED
 
        // report indicator that we're at l.multiply section 0x11111111
        l.movhi r3, 0x1111
        l.ori   r3, r3, 0x1111
        l.nop   0x2
 
        // Check multiplying two large numbers, which will cause overflow,
        // trigger the flag appropriately
 
        // First signed multiply.
        l.movhi r4, 0xd555      ;//-(((2^32)-1)/3 + 2)
        l.ori   r4, r4, 0x5552
        l.ori   r5, r0, 2
        l.ori   r6, r0, 3
 
        // First multiply big negative number by 2 - shouldn't overflow
        l.mul   r3, r4, r5
        l.nop   0x2
        CHECK_OV_CLEAR
 
        // Now multiply by 3 - should just overflow negative
        l.mul   r3, r4, r6
        l.nop   0x2
        CHECK_OV_SET
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_OV_CLEAR
 
        // Now some big positive values
        l.movhi r4, 0x2aaa      ;//((2^32)-1)/3 + 2
        l.ori   r4, r4, 0xaaae
        l.ori   r5, r0, 2
        l.ori   r6, r0, 3
 
        // First multiply big number by 2 - shouldn't overflow
        l.mul   r3, r4, r5
        l.nop   0x2
        CHECK_OV_CLEAR
 
        // Now multiply by 3 - should only just overflow
        l.mul   r3, r4, r6
        l.nop   0x2
        CHECK_OV_SET
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_OV_CLEAR
 
        // First multiply big number by 2 - shouldn't overflow
        l.muli  r3, r4, 0x2
        l.nop   0x2
        CHECK_OV_CLEAR
 
        // Now multiply by 3 - should just overflow negative
        l.muli  r3, r4, 0x3
        l.nop   0x2
        CHECK_OV_SET
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_OV_CLEAR
 
 
        // Now check overflow on  unsigned multiply
 
        // Some stimulus to make a 32-bit multiply overflow
        l.movhi r4, 0x5555      ;//((2^32))/3 + 2
        l.ori   r4, r4, 0x5557
        l.ori   r5, r0, 2
        l.ori   r6, r0, 3
 
        // First multiply big negative number by 2 - shouldn't overflow
        l.mulu  r3, r4, r5
        l.nop   0x2
        CHECK_OV_CLEAR
 
        // Now multiply by 3 - should just overflow negative
        l.mulu  r3, r4, r6
        l.nop   0x2
        CHECK_OV_SET
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_OV_CLEAR
 
#endif
 
        /////////////////////////////////////////////////////////////
        //                                                         //
        // Range Exception Tests                                   //
        //                                                         //
        /////////////////////////////////////////////////////////////
#ifdef OR1200_IMPL_OVE
        // report indicator that we're at exception section 0xeeeeeeee
        l.movhi r3, 0xeeee
        l.ori   r3, r3, 0xeeee
        l.nop   0x2
 
        // First enable OV exception in SR
 
        l.mfspr r20, r0, SPR_SR
        l.ori   r21, r20, SPR_SR_OVE
        l.mtspr r0, r21, SPR_SR
 
        // Check it's set
        l.mfspr r20, r0, SPR_SR
        l.andi  r21, r20, SPR_SR_OVE
        l.sfnei r21, SPR_SR_OVE
        l.bf    _fail
        l.nop
 
        // now set r11 to r12 to know how many tests we've done so far
        l.or    r11, r12, r12
 
        l.movhi r4, 0x7fff
        l.ori   r4, r4, 0xefff
 
        l.ori   r5, r0, 0xffff
 
        l.add   r3, r5, r4      ;// Should set overflow
        l.nop   0x2
        EXPECT_RANGE_EXCEPT
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
 
        l.addi  r3, r4, 0x7fff  ;// Should set overflow
        l.nop   0x2
        EXPECT_RANGE_EXCEPT
 
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
 
        // Now test negative numbers
 
        l.movhi r4, 0x8000
        l.ori   r4, r4, 0x0000
 
        l.movhi r5, 0xffff
        l.ori   r5, r5, 0xffff
 
        l.add   r3, r4, r5      // Biggest and smallest negative number
        l.nop   0x2
        EXPECT_RANGE_EXCEPT
 
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
        l.addi  r3, r4, 0xffff  // Biggest and smallest negative number
        l.nop   0x2
        EXPECT_RANGE_EXCEPT
 
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
        l.add   r3, r4, r0      // Biggest negative number, and zero
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
 
        l.movhi r5, 0xffff
        l.ori   r5, r5, 0xfffe
 
        l.add   r3, r4, r5      // Biggest and second smallest negative number
        l.nop   0x2
        EXPECT_RANGE_EXCEPT
 
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
#ifdef OR1200_IMPL_SUB
 
        // report indicator that we're at l.sub section 0x55555555
        l.movhi r3, 0x5555
        l.ori   r3, r3, 0x5555
        l.nop   0x2
 
        // Quick subtract check
        // Check largest negative number -1 tripping overflow
        l.ori   r5, r0, 1               ; // +1
        l.sub   r3, r4, r5              ; // -2147483647 - 1
        l.nop   0x2
        EXPECT_RANGE_EXCEPT
 
 
        l.sub   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
#endif
 
        l.movhi r4, 0x8000
        l.ori   r4, r4, 0x0437
 
        l.movhi r5, 0xffff
        l.ori   r5, r5, 0xfbc7
 
        l.add   r3, r4, r5      // Very big negative number, another one big
                                // enough to cause overflow hopefully
        l.nop   0x2
        EXPECT_RANGE_EXCEPT
 
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
        l.movhi r5, 0xffff
        l.ori   r5, r5, 0xfff7
 
        l.add   r3, r4, r5      // Two negative numbers but shouldn't overflow
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
#ifdef OR1200_DIV_IMPLEMENTED
 
        // report indicator that we're at l.div section 0xdddddddd
        l.movhi r3, 0xdddd
        l.ori   r3, r3, 0xdddd
        l.nop   0x2
 
        // Test divide by zero
        l.div   r3, r5, r0
        l.nop   0x2
 
        l.sfne  r3, r0          ;// Check result was 0
        l.bf    _fail
 
        EXPECT_RANGE_EXCEPT
 
 
        l.add   r3, r5, r0      ;// Should clear overflow
        l.nop   0x2
 
        CHECK_EXCEPTION_COUNTER
 
        // Test divide by zero
        l.divu  r3, r0, r0
        l.nop   0x2
        EXPECT_RANGE_EXCEPT
 
 
        l.sfne  r3, r0          ;// Check result was 0
        l.bf    _fail
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
#endif
 
#ifdef OR1200_MULT_IMPLEMENTED
 
        // report indicator that we're at l.multiply section 0x11111111
        l.movhi r3, 0x1111
        l.ori   r3, r3, 0x1111
        l.nop   0x2
 
        // Check multiplying two large numbers, which will cause overflow,
        // trigger the flag appropriately
 
        // First signed multiply.
        l.movhi r4, 0xd555      ;//-(((2^32)-1)/3 + 2)
        l.ori   r4, r4, 0x5552
        l.ori   r5, r0, 2
        l.ori   r6, r0, 3
 
        // First multiply big negative number by 2 - shouldn't overflow
        l.mul   r3, r4, r5
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
        // Now multiply by 3 - should just overflow negative
        l.mul   r3, r4, r6
        l.nop   0x2
        EXPECT_RANGE_EXCEPT
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
        // Now some big positive values
        l.movhi r4, 0x2aaa      ;//((2^32)-1)/3 + 2
        l.ori   r4, r4, 0xaaae
        l.ori   r5, r0, 2
        l.ori   r6, r0, 3
 
        // First multiply big number by 2 - shouldn't overflow
        l.mul   r3, r4, r5
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
        // Now multiply by 3 - should only just overflow
        l.mul   r3, r4, r6
        l.nop   0x2
        EXPECT_RANGE_EXCEPT
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
        // First multiply big number by 2 - shouldn't overflow
        l.muli  r3, r4, 0x2
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
        // Now multiply by 3 - should just overflow negative
        l.muli  r3, r4, 0x3
        l.nop   0x2
        EXPECT_RANGE_EXCEPT
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
 
        // Now check overflow on  unsigned multiply
 
        // Some stimulus to make a 32-bit multiply overflow
        l.movhi r4, 0x5555      ;//((2^32))/3 + 2
        l.ori   r4, r4, 0x5557
        l.ori   r5, r0, 2
        l.ori   r6, r0, 3
 
        // First multiply big negative number by 2 - shouldn't overflow
        l.mulu  r3, r4, r5
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
        // Now multiply by 3 - should just overflow negative
        l.mulu  r3, r4, r6
        l.nop   0x2
        EXPECT_RANGE_EXCEPT
 
        l.add   r3, r0, r0      ;// Should clear overflow
        l.nop   0x2
        CHECK_EXCEPTION_COUNTER
 
#endif
 
#endif
 
 
_finish:
        l.movhi r3, hi(0x8000000d)
        l.ori   r3, r3, lo(0x8000000d)
        l.nop   0x2
        l.ori   r3, r0, 0
        l.nop   0x1
 
_fail:
        l.or    r3, r12, r0     ;// Fail and report test number we were up to
        l.nop   0x1

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[/] [openrisc/] [trunk/] [orpsocv2/] [sw/] [tests/] [or1200/] [sim/] [or1200-ov.S] - Blame information for rev 744

Line No.	Rev	Author	Line
1	502	julius	`/*`
2			`OR1200 overflow bit checking`
3
4			`Very basic, testing`
5
6			`TODO: Check range exception handling in delay slots`
7
8			`Julius Baxter, ORSoC AB, julius.baxter@orsoc.se`
9
10			`*/`
11			`//////////////////////////////////////////////////////////////////////`
12			`//// ////`
13			`//// Copyright (C) 2011 Authors and OPENCORES.ORG ////`
14			`//// ////`
15			`//// This source file may be used and distributed without ////`
16			`//// restriction provided that this copyright statement is not ////`
17			`//// removed from the file and that any derivative work contains ////`
18			`//// the original copyright notice and the associated disclaimer. ////`
19			`//// ////`
20			`//// This source file is free software; you can redistribute it ////`
21			`//// and/or modify it under the terms of the GNU Lesser General ////`
22			`//// Public License as published by the Free Software Foundation; ////`
23			`//// either version 2.1 of the License, or (at your option) any ////`
24			`//// later version. ////`
25			`//// ////`
26			`//// This source is distributed in the hope that it will be ////`
27			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
28			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
29			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
30			`//// details. ////`
31			`//// ////`
32			`//// You should have received a copy of the GNU Lesser General ////`
33			`//// Public License along with this source; if not, download it ////`
34			`//// from http://www.opencores.org/lgpl.shtml ////`
35			`//// ////`
36			`//////////////////////////////////////////////////////////////////////`
37
38
39			`#include "spr-defs.h"`
40			`#include "board.h"`
41			`#include "or1200-defines.h"`
42
43
44			`/* =================================================== [ exceptions ] === */`
45			`.section .vectors, "ax"`
46
47
48			`/* ---[ 0x100: RESET exception ]----------------------------------------- */`
49			`.org 0x100`
50			`l.movhi r0, 0`
51			`/* Clear status register */`
52			`l.ori r1, r0, SPR_SR_SM`
53			`l.mtspr r0, r1, SPR_SR`
54			`/* Clear timer */`
55			`l.mtspr r0, r0, SPR_TTMR`
56
57			`/* Jump to program initialisation code */`
58			`.global _start`
59			`l.movhi r4, hi(_start)`
60			`l.ori r4, r4, lo(_start)`
61			`l.jr r4`
62			`l.nop`
63
64			`.org 0x600`
65			`l.nop 0x1`
66
67
68			`/* ---[ 0x700: Illegal instruction exception ]-------------------------- */`
69			`.org 0x700`
70			`#ifndef OR1200_IMPL_ADDC`
71			`// No problem - instruction not supported`
72			`l.movhi r3, hi(0x8000000d)`
73			`l.ori r3, r3, lo(0x8000000d)`
74			`l.nop 0x2`
75			`l.ori r3, r0, 0`
76			`#else`
77			`l.ori r3, r0, 1`
78			`#endif`
79			`l.nop 0x1`
80
81			`#define INCREMENT_EXCEPTION_COUNTER l.addi r11, r11, 0x1`
82			`#define CHECK_EXCEPTION_COUNTER \`
83			`l.sfne r11, r12 ; \`
84			`l.bf _fail ; \`
85			`l.nop ;`
86			`#define EXPECT_RANGE_EXCEPT \`
87			`l.addi r12, r12, 1 ; \`
88			`CHECK_EXCEPTION_COUNTER`
89
90			`/* ---[ 0xb00: Range exception ]---------------------------------------- */`
91			`.org 0xb00`
92			`l.sw 0(r0), r3 ;// Save r3 - don't disrupt it during exceptions`
93			`l.ori r3, r0, 0xaaee`
94			`l.nop 0x2`
95			`// TODO - get instruction and decode to ensure it was an instruction`
96			`// which is capable of causing a range exception. Remember delay slot!`
97			`INCREMENT_EXCEPTION_COUNTER`
98
99			`// Clear OV in ESR`
100			`l.mfspr r3,r0,SPR_ESR_BASE ;// Get ESR`
101			`l.nop 2`
102			`l.xori r3, r3,SPR_SR_OV ;// Clear OV bit`
103			`l.mtspr r0,r3,SPR_ESR_BASE ;// Get EPC`
104
105			`l.mfspr r3,r0,SPR_EPCR_BASE ;// Get EPC`
106			`l.nop 2`
107			`l.addi r3, r3, 0x4 ;// Increment`
108			`l.mtspr r0,r3,SPR_EPCR_BASE ;// Get EPC`
109			`// For now, increment EPCR so we step over instruction and continue`
110
111			`l.lwz r3, 0(r0)`
112			`l.rfe`
113
114			`/* =================================================== [ text ] === */`
115			`.section .text`
116
117			`/* =================================================== [ start ] === */`
118
119			`.global _start`
120			`_start:`
121			`// Clear all regs`
122			`l.movhi r1, 0`
123			`l.movhi r2, 0`
124			`l.movhi r3, 0`
125			`l.movhi r4, 0`
126			`l.movhi r5, 0`
127			`l.movhi r6, 0`
128			`l.movhi r7, 0`
129			`l.movhi r8, 0`
130			`l.movhi r9, 0`
131			`l.movhi r10, 0`
132			`l.movhi r11, 0`
133			`l.movhi r12, 0`
134			`l.movhi r13, 0`
135			`l.movhi r14, 0`
136			`l.movhi r15, 0`
137			`l.movhi r16, 0`
138			`l.movhi r17, 0`
139			`l.movhi r18, 0`
140			`l.movhi r19, 0`
141			`l.movhi r20, 0`
142			`l.movhi r21, 0`
143			`l.movhi r22, 0`
144			`l.movhi r23, 0`
145			`l.movhi r24, 0`
146			`l.movhi r25, 0`
147			`l.movhi r26, 0`
148			`l.movhi r27, 0`
149			`l.movhi r28, 0`
150			`l.movhi r29, 0`
151			`l.movhi r30, 0`
152			`l.movhi r31, 0`
153
154			`#ifdef OR1200_IMPL_OV`
155			`// Kick off test`
156			`l.jal _main`
157			`#else`
158			`// Not supported, exit test`
159			`l.j _finish`
160			`#endif`
161			`l.nop`
162
163
164			`/* =================================================== [ main ] === */`
165
166
167			`#define CHECK_OV_CLEAR \`
168			`l.mfspr r20, r0, SPR_SR ; \`
169			`l.andi r21, r20, SPR_SR_OV ; \`
170			`l.sfne r21, r0 ; \`
171			`l.bf _fail ; \`
172			`l.nop`
173
174			`#define CHECK_OV_SET \`
175			`l.mfspr r20, r0, SPR_SR ; \`
176			`l.andi r21, r20, SPR_SR_OV ; \`
177			`l.sfnei r21, SPR_SR_OV ; \`
178			`l.bf _fail ; \`
179			`l.addi r12, r12, 0x1 ; // Increment expected counter`
180
181			`.global _main`
182			`_main:`
183
184			`// Set up some values, check the OV bit is cleared`
185			`CHECK_OV_CLEAR`
186
187			`l.movhi r4, 0x7fff`
188			`l.ori r4, r4, 0xefff`
189
190			`l.ori r5, r0, 0xffff`
191
192			`l.add r3, r5, r4 ;// Should set overflow`
193			`l.nop 0x2`
194			`CHECK_OV_SET`
195
196			`l.add r3, r0, r0 ;// Should clear overflow`
197			`l.nop 0x2`
198			`CHECK_OV_CLEAR`
199
200			`l.addi r3, r4, 0x7fff ;// Should set overflow`
201			`l.nop 0x2`
202			`CHECK_OV_SET`
203
204			`l.add r3, r0, r0 ;// Should clear overflow`
205			`l.nop 0x2`
206			`CHECK_OV_CLEAR`
207
208			`// Now test negative numbers`
209
210			`l.movhi r4, 0x8000`
211			`l.ori r4, r4, 0x0000`
212
213			`l.movhi r5, 0xffff`
214			`l.ori r5, r5, 0xffff`
215
216			`l.add r3, r4, r5 // Biggest and smallest negative number`
217			`l.nop 0x2`
218			`CHECK_OV_SET`
219
220			`l.add r3, r0, r0 ;// Should clear overflow`
221			`l.nop 0x2`
222			`CHECK_OV_CLEAR`
223
224			`l.addi r3, r4, 0xffff // Biggest and smallest negative number`
225			`l.nop 0x2`
226			`CHECK_OV_SET`
227
228			`l.add r3, r0, r0 ;// Should clear overflow`
229			`l.nop 0x2`
230			`CHECK_OV_CLEAR`
231
232			`l.add r3, r4, r0 // Biggest negative number, and zero`
233			`l.nop 0x2`
234			`CHECK_OV_CLEAR`
235
236			`l.add r3, r0, r0 ;// Should clear overflow`
237			`l.nop 0x2`
238			`CHECK_OV_CLEAR`
239
240			`l.movhi r5, 0xffff`
241			`l.ori r5, r5, 0xfffe`
242
243			`l.add r3, r4, r5 // Biggest and second smallest negative number`
244			`l.nop 0x2`
245			`CHECK_OV_SET`
246
247			`l.add r3, r0, r0 ;// Should clear overflow`
248			`l.nop 0x2`
249			`CHECK_OV_CLEAR`
250
251			`#ifdef OR1200_IMPL_SUB`
252
253			`// report indicator that we're at l.sub section 0x55555555`
254			`l.movhi r3, 0x5555`
255			`l.ori r3, r3, 0x5555`
256			`l.nop 0x2`
257
258			`// Quick subtract check`
259			`// Check largest negative number -1 tripping overflow`
260			`l.ori r5, r0, 1 ; // +1`
261			`l.sub r3, r4, r5 ; // -2147483647 - 1`
262			`l.nop 0x2`
263			`CHECK_OV_SET`
264
265			`l.add r3, r0, r0 ;// Should clear overflow`
266			`l.nop 0x2`
267			`CHECK_OV_CLEAR`
268			`#endif`
269
270			`l.movhi r4, 0x8000`
271			`l.ori r4, r4, 0x0437`
272
273			`l.movhi r5, 0xffff`
274			`l.ori r5, r5, 0xfbc7`
275
276			`l.add r3, r4, r5 // Very big negative number, another one big`
277			`// enough to cause overflow hopefully`
278			`l.nop 0x2`
279			`CHECK_OV_SET`
280
281			`l.add r3, r0, r0 ;// Should clear overflow`
282			`l.nop 0x2`
283			`CHECK_OV_CLEAR`
284
285			`l.movhi r5, 0xffff`
286			`l.ori r5, r5, 0xfff7`
287
288			`l.add r3, r4, r5 // Two negative numbers but shouldn't overflow`
289			`l.nop 0x2`
290			`CHECK_OV_CLEAR`
291
292			`#ifdef OR1200_DIV_IMPLEMENTED`
293
294			`// report indicator that we're at l.div section 0xdddddddd`
295			`l.movhi r3, 0xdddd`
296			`l.ori r3, r3, 0xdddd`
297			`l.nop 0x2`
298
299			`// Test divide by zero`
300			`l.div r3, r5, r0`
301			`l.nop 0x2`
302
303			`l.sfne r3, r0 ;// Check result was 0`
304			`l.bf _fail`
305
306			`CHECK_OV_SET`
307
308			`l.add r3, r5, r0 ;// Should clear overflow`
309			`l.nop 0x2`
310
311			`CHECK_OV_CLEAR`
312
313			`// Test divide by zero`
314			`l.divu r3, r0, r0`
315			`l.nop 0x2`
316			`CHECK_OV_SET`
317
318			`l.sfne r3, r0 ;// Check result was 0`
319			`l.bf _fail`
320
321			`l.add r3, r0, r0 ;// Should clear overflow`
322			`l.nop 0x2`
323			`CHECK_OV_CLEAR`
324
325			`#endif`
326
327			`#ifdef OR1200_MULT_IMPLEMENTED`
328
329			`// report indicator that we're at l.multiply section 0x11111111`
330			`l.movhi r3, 0x1111`
331			`l.ori r3, r3, 0x1111`
332			`l.nop 0x2`
333
334			`// Check multiplying two large numbers, which will cause overflow,`
335			`// trigger the flag appropriately`
336
337			`// First signed multiply.`
338			`l.movhi r4, 0xd555 ;//-(((2^32)-1)/3 + 2)`
339			`l.ori r4, r4, 0x5552`
340			`l.ori r5, r0, 2`
341			`l.ori r6, r0, 3`
342
343			`// First multiply big negative number by 2 - shouldn't overflow`
344			`l.mul r3, r4, r5`
345			`l.nop 0x2`
346			`CHECK_OV_CLEAR`
347
348			`// Now multiply by 3 - should just overflow negative`
349			`l.mul r3, r4, r6`
350			`l.nop 0x2`
351			`CHECK_OV_SET`
352
353			`l.add r3, r0, r0 ;// Should clear overflow`
354			`l.nop 0x2`
355			`CHECK_OV_CLEAR`
356
357			`// Now some big positive values`
358			`l.movhi r4, 0x2aaa ;//((2^32)-1)/3 + 2`
359			`l.ori r4, r4, 0xaaae`
360			`l.ori r5, r0, 2`
361			`l.ori r6, r0, 3`
362
363			`// First multiply big number by 2 - shouldn't overflow`
364			`l.mul r3, r4, r5`
365			`l.nop 0x2`
366			`CHECK_OV_CLEAR`
367
368			`// Now multiply by 3 - should only just overflow`
369			`l.mul r3, r4, r6`
370			`l.nop 0x2`
371			`CHECK_OV_SET`
372
373			`l.add r3, r0, r0 ;// Should clear overflow`
374			`l.nop 0x2`
375			`CHECK_OV_CLEAR`
376
377			`// First multiply big number by 2 - shouldn't overflow`
378			`l.muli r3, r4, 0x2`
379			`l.nop 0x2`
380			`CHECK_OV_CLEAR`
381
382			`// Now multiply by 3 - should just overflow negative`
383			`l.muli r3, r4, 0x3`
384			`l.nop 0x2`
385			`CHECK_OV_SET`
386
387			`l.add r3, r0, r0 ;// Should clear overflow`
388			`l.nop 0x2`
389			`CHECK_OV_CLEAR`
390
391
392			`// Now check overflow on unsigned multiply`
393
394			`// Some stimulus to make a 32-bit multiply overflow`
395			`l.movhi r4, 0x5555 ;//((2^32))/3 + 2`
396			`l.ori r4, r4, 0x5557`
397			`l.ori r5, r0, 2`
398			`l.ori r6, r0, 3`
399
400			`// First multiply big negative number by 2 - shouldn't overflow`
401			`l.mulu r3, r4, r5`
402			`l.nop 0x2`
403			`CHECK_OV_CLEAR`
404
405			`// Now multiply by 3 - should just overflow negative`
406			`l.mulu r3, r4, r6`
407			`l.nop 0x2`
408			`CHECK_OV_SET`
409
410			`l.add r3, r0, r0 ;// Should clear overflow`
411			`l.nop 0x2`
412			`CHECK_OV_CLEAR`
413
414			`#endif`
415
416			`/////////////////////////////////////////////////////////////`
417			`// //`
418			`// Range Exception Tests //`
419			`// //`
420			`/////////////////////////////////////////////////////////////`
421			`#ifdef OR1200_IMPL_OVE`
422			`// report indicator that we're at exception section 0xeeeeeeee`
423			`l.movhi r3, 0xeeee`
424			`l.ori r3, r3, 0xeeee`
425			`l.nop 0x2`
426
427			`// First enable OV exception in SR`
428
429			`l.mfspr r20, r0, SPR_SR`
430			`l.ori r21, r20, SPR_SR_OVE`
431			`l.mtspr r0, r21, SPR_SR`
432
433			`// Check it's set`
434			`l.mfspr r20, r0, SPR_SR`
435			`l.andi r21, r20, SPR_SR_OVE`
436			`l.sfnei r21, SPR_SR_OVE`
437			`l.bf _fail`
438			`l.nop`
439
440			`// now set r11 to r12 to know how many tests we've done so far`
441			`l.or r11, r12, r12`
442
443			`l.movhi r4, 0x7fff`
444			`l.ori r4, r4, 0xefff`
445
446			`l.ori r5, r0, 0xffff`
447
448			`l.add r3, r5, r4 ;// Should set overflow`
449			`l.nop 0x2`
450			`EXPECT_RANGE_EXCEPT`
451
452			`l.add r3, r0, r0 ;// Should clear overflow`
453			`l.nop 0x2`
454			`CHECK_EXCEPTION_COUNTER`
455
456
457			`l.addi r3, r4, 0x7fff ;// Should set overflow`
458			`l.nop 0x2`
459			`EXPECT_RANGE_EXCEPT`
460
461
462			`l.add r3, r0, r0 ;// Should clear overflow`
463			`l.nop 0x2`
464			`CHECK_EXCEPTION_COUNTER`
465
466
467			`// Now test negative numbers`
468
469			`l.movhi r4, 0x8000`
470			`l.ori r4, r4, 0x0000`
471
472			`l.movhi r5, 0xffff`
473			`l.ori r5, r5, 0xffff`
474
475			`l.add r3, r4, r5 // Biggest and smallest negative number`
476			`l.nop 0x2`
477			`EXPECT_RANGE_EXCEPT`
478
479
480			`l.add r3, r0, r0 ;// Should clear overflow`
481			`l.nop 0x2`
482			`CHECK_EXCEPTION_COUNTER`
483
484			`l.addi r3, r4, 0xffff // Biggest and smallest negative number`
485			`l.nop 0x2`
486			`EXPECT_RANGE_EXCEPT`
487
488
489			`l.add r3, r0, r0 ;// Should clear overflow`
490			`l.nop 0x2`
491			`CHECK_EXCEPTION_COUNTER`
492
493			`l.add r3, r4, r0 // Biggest negative number, and zero`
494			`l.nop 0x2`
495			`CHECK_EXCEPTION_COUNTER`
496
497
498			`l.add r3, r0, r0 ;// Should clear overflow`
499			`l.nop 0x2`
500			`CHECK_EXCEPTION_COUNTER`
501
502
503			`l.movhi r5, 0xffff`
504			`l.ori r5, r5, 0xfffe`
505
506			`l.add r3, r4, r5 // Biggest and second smallest negative number`
507			`l.nop 0x2`
508			`EXPECT_RANGE_EXCEPT`
509
510
511			`l.add r3, r0, r0 ;// Should clear overflow`
512			`l.nop 0x2`
513			`CHECK_EXCEPTION_COUNTER`
514
515			`#ifdef OR1200_IMPL_SUB`
516
517			`// report indicator that we're at l.sub section 0x55555555`
518			`l.movhi r3, 0x5555`
519			`l.ori r3, r3, 0x5555`
520			`l.nop 0x2`
521
522			`// Quick subtract check`
523			`// Check largest negative number -1 tripping overflow`
524			`l.ori r5, r0, 1 ; // +1`
525			`l.sub r3, r4, r5 ; // -2147483647 - 1`
526			`l.nop 0x2`
527			`EXPECT_RANGE_EXCEPT`
528
529
530			`l.sub r3, r0, r0 ;// Should clear overflow`
531			`l.nop 0x2`
532			`CHECK_EXCEPTION_COUNTER`
533
534			`#endif`
535
536			`l.movhi r4, 0x8000`
537			`l.ori r4, r4, 0x0437`
538
539			`l.movhi r5, 0xffff`
540			`l.ori r5, r5, 0xfbc7`
541
542			`l.add r3, r4, r5 // Very big negative number, another one big`
543			`// enough to cause overflow hopefully`
544			`l.nop 0x2`
545			`EXPECT_RANGE_EXCEPT`
546
547
548			`l.add r3, r0, r0 ;// Should clear overflow`
549			`l.nop 0x2`
550			`CHECK_EXCEPTION_COUNTER`
551
552			`l.movhi r5, 0xffff`
553			`l.ori r5, r5, 0xfff7`
554
555			`l.add r3, r4, r5 // Two negative numbers but shouldn't overflow`
556			`l.nop 0x2`
557			`CHECK_EXCEPTION_COUNTER`
558
559			`#ifdef OR1200_DIV_IMPLEMENTED`
560
561			`// report indicator that we're at l.div section 0xdddddddd`
562			`l.movhi r3, 0xdddd`
563			`l.ori r3, r3, 0xdddd`
564			`l.nop 0x2`
565
566			`// Test divide by zero`
567			`l.div r3, r5, r0`
568			`l.nop 0x2`
569
570			`l.sfne r3, r0 ;// Check result was 0`
571			`l.bf _fail`
572
573			`EXPECT_RANGE_EXCEPT`
574
575
576			`l.add r3, r5, r0 ;// Should clear overflow`
577			`l.nop 0x2`
578
579			`CHECK_EXCEPTION_COUNTER`
580
581			`// Test divide by zero`
582			`l.divu r3, r0, r0`
583			`l.nop 0x2`
584			`EXPECT_RANGE_EXCEPT`
585
586
587			`l.sfne r3, r0 ;// Check result was 0`
588			`l.bf _fail`
589
590			`l.add r3, r0, r0 ;// Should clear overflow`
591			`l.nop 0x2`
592			`CHECK_EXCEPTION_COUNTER`
593
594			`#endif`
595
596			`#ifdef OR1200_MULT_IMPLEMENTED`
597
598			`// report indicator that we're at l.multiply section 0x11111111`
599			`l.movhi r3, 0x1111`
600			`l.ori r3, r3, 0x1111`
601			`l.nop 0x2`
602
603			`// Check multiplying two large numbers, which will cause overflow,`
604			`// trigger the flag appropriately`
605
606			`// First signed multiply.`
607			`l.movhi r4, 0xd555 ;//-(((2^32)-1)/3 + 2)`
608			`l.ori r4, r4, 0x5552`
609			`l.ori r5, r0, 2`
610			`l.ori r6, r0, 3`
611
612			`// First multiply big negative number by 2 - shouldn't overflow`
613			`l.mul r3, r4, r5`
614			`l.nop 0x2`
615			`CHECK_EXCEPTION_COUNTER`
616
617			`// Now multiply by 3 - should just overflow negative`
618			`l.mul r3, r4, r6`
619			`l.nop 0x2`
620			`EXPECT_RANGE_EXCEPT`
621
622			`l.add r3, r0, r0 ;// Should clear overflow`
623			`l.nop 0x2`
624			`CHECK_EXCEPTION_COUNTER`
625
626			`// Now some big positive values`
627			`l.movhi r4, 0x2aaa ;//((2^32)-1)/3 + 2`
628			`l.ori r4, r4, 0xaaae`
629			`l.ori r5, r0, 2`
630			`l.ori r6, r0, 3`
631
632			`// First multiply big number by 2 - shouldn't overflow`
633			`l.mul r3, r4, r5`
634			`l.nop 0x2`
635			`CHECK_EXCEPTION_COUNTER`
636
637			`// Now multiply by 3 - should only just overflow`
638			`l.mul r3, r4, r6`
639			`l.nop 0x2`
640			`EXPECT_RANGE_EXCEPT`
641
642			`l.add r3, r0, r0 ;// Should clear overflow`
643			`l.nop 0x2`
644			`CHECK_EXCEPTION_COUNTER`
645
646			`// First multiply big number by 2 - shouldn't overflow`
647			`l.muli r3, r4, 0x2`
648			`l.nop 0x2`
649			`CHECK_EXCEPTION_COUNTER`
650
651			`// Now multiply by 3 - should just overflow negative`
652			`l.muli r3, r4, 0x3`
653			`l.nop 0x2`
654			`EXPECT_RANGE_EXCEPT`
655
656			`l.add r3, r0, r0 ;// Should clear overflow`
657			`l.nop 0x2`
658			`CHECK_EXCEPTION_COUNTER`
659
660
661			`// Now check overflow on unsigned multiply`
662
663			`// Some stimulus to make a 32-bit multiply overflow`
664			`l.movhi r4, 0x5555 ;//((2^32))/3 + 2`
665			`l.ori r4, r4, 0x5557`
666			`l.ori r5, r0, 2`
667			`l.ori r6, r0, 3`
668
669			`// First multiply big negative number by 2 - shouldn't overflow`
670			`l.mulu r3, r4, r5`
671			`l.nop 0x2`
672			`CHECK_EXCEPTION_COUNTER`
673
674			`// Now multiply by 3 - should just overflow negative`
675			`l.mulu r3, r4, r6`
676			`l.nop 0x2`
677			`EXPECT_RANGE_EXCEPT`
678
679			`l.add r3, r0, r0 ;// Should clear overflow`
680			`l.nop 0x2`
681			`CHECK_EXCEPTION_COUNTER`
682
683			`#endif`
684
685			`#endif`
686
687
688			`_finish:`
689			`l.movhi r3, hi(0x8000000d)`
690			`l.ori r3, r3, lo(0x8000000d)`
691			`l.nop 0x2`
692			`l.ori r3, r0, 0`
693			`l.nop 0x1`
694
695			`_fail:`
696			`l.or r3, r12, r0 ;// Fail and report test number we were up to`
697			`l.nop 0x1`