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107 lines
2.4 KiB
NASM
107 lines
2.4 KiB
NASM
/**
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* @file call-banked-phi-case-3-near-1.c
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* @author Sven Van de Velde (sven.van.de.velde@telenet.be),
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* @author Jesper Gravgaard
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* @brief Test a procedure with calling convention PHI - case #3.
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* Implementation using the #pragma bank and nobank directives.
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* @version 0.1
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* @date 2023-04-11
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*
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* @copyright Copyright (c) 2023
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*
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* The following cases exist in banked calling implementations:
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*
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* - case #1 - unbanked to unbanked and no banking areas
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* - case #2 - unbanked to banked to any bank area
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* - case #3 - banked to unbanked from any bank area
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* - case #4 - banked to same bank in same bank area
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* - case #5 - banked to different bank in same bank area
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* - case #6 - banked to any bank between different bank areas
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*
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* This brings us to the call types:
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*
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* - near = case #1, #3, #4
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* - close = case #2, #6
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* - far = case #5
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*
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*/
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.file [name="call-banked-phi-case-3-near-1.prg", type="prg", segments="Program"]
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.segmentdef Program [segments="Basic, Code, Data"]
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.segmentdef Basic [start=$0801]
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.segmentdef Code [start=$80d]
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.segmentdef Data [startAfter="Code"]
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.segmentdef RAM_Bank1 [start=$A000, min=$A000, max=$BFFF, align=$100]
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.segmentdef RAM_Bank2 [start=$A000, min=$A000, max=$BFFF, align=$100]
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.segmentdef ROM_Bank1 [start=$C000, min=$C000, max=$FFFF, align=$100]
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.segment Basic
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:BasicUpstart(main)
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.segment Code
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.segment Data
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.label SCREEN = $400
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.segment Code
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main: {
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// plus('0', 7)
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ldx #7
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lda #'0'
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sta.z $ff
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lda.z 0
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pha
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lda #1
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sta.z 0
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lda.z $ff
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jsr plus
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sta.z $ff
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pla
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sta.z 0
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lda.z $ff
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// plus('0', 7)
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txa
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// SCREEN[0] = plus('0', 7)
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sta SCREEN
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// plus('1', 6)
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ldx #6
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lda #'1'
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sta.z $ff
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lda.z 0
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pha
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lda #1
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sta.z 0
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lda.z $ff
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jsr plus
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sta.z $ff
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pla
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sta.z 0
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lda.z $ff
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// plus('1', 6)
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txa
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// SCREEN[1] = plus('1', 6)
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// close call
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sta SCREEN+1
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// }
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rts
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}
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.segment RAM_Bank1
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// __register(X) char plus(__register(A) char a, __register(X) char b)
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// __bank(cx16_ram, 1)
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plus: {
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// add(a, b)
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sta.z add.a
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txa
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jsr add
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tax
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// }
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rts
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}
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.segment Code
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// __register(A) char add(__zp(2) char a, __register(A) char b)
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add: {
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.label a = 2
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// a+b
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clc
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adc.z a
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// }
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rts
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}
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