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/*===========================================================================*/
/* Copyright (C) 2001 Authors                                                */
/*                                                                           */
/* 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, write to the Free Software Foundation,    */
/* Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA        */
/*                                                                           */
/*===========================================================================*/
/*                 SINGLE-OPERAND ARITHMETIC: CALL  INSTRUCTION              */
/*---------------------------------------------------------------------------*/
/* Test the CALL  instruction.                                               */
/*                                                                           */
/* Author(s):                                                                */
/*             - Olivier Girard,    olgirard@gmail.com                       */
/*                                                                           */
/*---------------------------------------------------------------------------*/
/* $Rev: 128 $                                                                */
/* $LastChangedBy: olivier.girard $                                          */
/* $LastChangedDate: 2011-12-16 22:05:46 +0100 (Fri, 16 Dec 2011) $          */
/*===========================================================================*/

.set    DMEM_BASE, (__data_start     )
.set    DMEM_200,  (__data_start+0x00)
.set    DMEM_212,  (__data_start+0x12)
.set    DMEM_216,  (__data_start+0x16)
.set    DMEM_21A,  (__data_start+0x1A)
.set    DMEM_21E,  (__data_start+0x1E)
.set    DMEM_220,  (__data_start+0x20)
.set    DMEM_250,  (__data_start+0x50)
.set    DMEM_252,  (__data_start+0x52)
.set    DMEM_300,  (__data_start+0x100)

.global main

main:
        /* -------------- TEST INSTRUCTION WITH STANDARD REGISTERS AS ARGUMENT ------------------- */

        # Initialization
        #------------------------

        mov   #DMEM_252, r1        ;# Initialize stack pointer
        mov     #0x0000, r5        ;# Initialize R5


        mov     #0x1000, r15


        # Addressing mode: Rn
        #------------------------

        mov     #0x0000, r5
        mov  #TEST_ROUTINE_RN, r4
        mov     #0x5555, &0x0300
        call         r4            ;# CALL TEST_ROUTINE_RN

        mov     #0x2000, r15


        # Addressing mode: @Rn
        #------------------------

        mov   #DMEM_212, r4
        mov     #0x0000, r5
        mov   #TEST_ROUTINE_aRN, &DMEM_212
        mov     #0x5555, &DMEM_300
        call        @r4           ;# CALL TEST_ROUTINE_aRN

        mov     #0x3000, r15


        # Addressing mode: @Rn+
        #------------------------

        mov     #DMEM_216, r4
        mov     #0x0000, r5
        mov   #TEST_ROUTINE_aRNi, &DMEM_216
        mov     #0x5555, &DMEM_300
        call       @r4+           ;# CALL TEST_ROUTINE_aRNi

        mov     #0x4000, r15


        # Addressing mode: #N
        #------------------------

        mov     #0x0000, r5
        mov     #0x5555, &DMEM_300
        call    #TEST_ROUTINE_N   ;# CALL TEST_ROUTINE_N

        mov     #0x5000, r15


        # Addressing mode: X(Rn)
        #------------------------

        mov     #DMEM_200, r4
        mov     #0x0000, r5
        mov  #TEST_ROUTINE_xRN, &DMEM_21A
        mov     #0x5555, &DMEM_300
        call      26(r4)           ;# CALL TEST_ROUTINE_xRN

        mov     #0x6000, r15


        # Addressing mode: EDE
        #------------------------
.set   EDE_21E,  DMEM_21E

        mov     #0x0000, r5
        mov  #TEST_ROUTINE_EDE, &DMEM_21E
        mov     #0x5555, &DMEM_300
        call    EDE_21E            ;# CALL TEST_ROUTINE_EDE

        mov     #0x7000, r15


        # Addressing mode: &EDE
        #------------------------
.set   aEDE_220,  DMEM_220

        mov     #0x0000, r5
        mov  #TEST_ROUTINE_aEDE, &aEDE_220
        mov     #0x5555, &DMEM_300
        call  &aEDE_220            ;# CALL TEST_ROUTINE_aEDE

        mov     #0x8000, r15


        /* -------------- TEST INSTRUCTION WITH SR AS ARGUMENT ------------------- */
 

        # Addressing mode: SR
        #------------------------

        mov #0x0000, r5
        nop
        #call    r1                 ;# NOT VALID BECAUSE IT JUMPS IN THE DATA MEMORY
        nop                         ;# WHICH IS NOT EXECUTABLE 

        mov     #0x9000, r15


        # Addressing mode: @SR
        #------------------------

        mov  #DMEM_252, r1        ;# Initialize stack pointer
        push #TEST_ROUTINE_RN
        push #TEST_ROUTINE_aRN
        push #TEST_ROUTINE_aRNi
        mov  r1, r13              ; backup stack for later
        push #TEST_ROUTINE_N
        push #TEST_ROUTINE_xRN
        push #TEST_ROUTINE_EDE
        push #TEST_ROUTINE_aEDE

        nop
        mov     r13, r1
        mov #0x0000, r5
        nop
        call    @r1                ;# CALL #TEST_ROUTINE_N (r5 = 0xabcd)
        nop

        mov     #0xa000, r15


        # Addressing mode: @SR+
        #------------------------

        mov  #DMEM_252, r1        ;# Initialize stack pointer
        push #TEST_ROUTINE_SPECIAL_aRNi
        push #TEST_ROUTINE_RN
        push #TEST_ROUTINE_aRN
        push #TEST_ROUTINE_aRNi
        mov  r1, r13              ; backup stack for later
        push #TEST_ROUTINE_N
        push #TEST_ROUTINE_xRN
        push #TEST_ROUTINE_EDE
        push #TEST_ROUTINE_aEDE

        nop
        mov     r13, r1
        mov #0x0000, r5
        nop
        call    @r1+               ;# CALL #TEST_ROUTINE_N (this has a funny behavior of nested call backward until SPECIAL_aRNi is reached)
        nop

        mov     #0xb000, r15


        # Addressing mode: x(SR)
        #------------------------
                        
        mov  #DMEM_252, r1        ;# Initialize stack pointer
        push #TEST_ROUTINE_RN
        push #TEST_ROUTINE_aRN
        push #TEST_ROUTINE_aRNi
        push #TEST_ROUTINE_N
        push #TEST_ROUTINE_xRN
        push #TEST_ROUTINE_EDE
        push #TEST_ROUTINE_aEDE
        nop
        mov #0x0000, r5
        mov #0x0000, r6
        mov #0x0000, r7
        call   4(r1)            ;# CALL #TEST_ROUTINE_EDE  (r7 = 0x2345)
        mov      r5, r7
        mov #0x0000, r5
        call   6(r1)            ;# CALL #TEST_ROUTINE_xRN  (r6 = 0xef01)
        mov      r5, r6
        mov #0x0000, r5
        call  10(r1)            ;# CALL #TEST_ROUTINE_aRNi (r5 = 0x9abc)
        nop
        
        mov     #0xc000, r15


        
        /* ----------------------         END OF TEST        --------------- */
end_of_test:
        nop
        br #0xffff



        /* ----------------------         TEST FUNCTIONS     --------------- */

TEST_ROUTINE_RN:
        mov #0x1234, r5
        ret

TEST_ROUTINE_aRN:
        mov #0x5678, r5
        ret

TEST_ROUTINE_aRNi:
        mov #0x9abc, r5
        ret

TEST_ROUTINE_N:
        mov #0xabcd, r5
        ret

TEST_ROUTINE_xRN:
        mov #0xef01, r5
        ret

TEST_ROUTINE_EDE:
        mov #0x2345, r5
        ret

TEST_ROUTINE_aEDE:
        mov #0x6789, r5
        ret

TEST_ROUTINE_SPECIAL_aRNi:
        mov #0x159a, r5
        sub #0x000a, r1
        ret



        /* ----------------------         INTERRUPT VECTORS  --------------- */

.section .vectors, "a"
.word end_of_test  ; Interrupt  0 (lowest priority)    <unused>
.word end_of_test  ; Interrupt  1                      <unused>
.word end_of_test  ; Interrupt  2                      <unused>
.word end_of_test  ; Interrupt  3                      <unused>
.word end_of_test  ; Interrupt  4                      <unused>
.word end_of_test  ; Interrupt  5                      <unused>
.word end_of_test  ; Interrupt  6                      <unused>
.word end_of_test  ; Interrupt  7                      <unused>
.word end_of_test  ; Interrupt  8                      <unused>
.word end_of_test  ; Interrupt  9                      <unused>
.word end_of_test  ; Interrupt 10                      Watchdog timer
.word end_of_test  ; Interrupt 11                      <unused>
.word end_of_test  ; Interrupt 12                      <unused>
.word end_of_test  ; Interrupt 13                      <unused>
.word end_of_test  ; Interrupt 14                      NMI
.word main         ; Interrupt 15 (highest priority)   RESET