mirror of
https://github.com/fadden/6502bench.git
synced 2024-07-04 01:29:34 +00:00
bc7a225080
Added a compiled C implementation of strlen(). The most interesting part about this is that it references a 16-bit value via direct-page address $ff, which means you'd want a local variable with address=$ff and width=2. The current UI prevents this.
178 lines
3.9 KiB
ArmAsm
178 lines
3.9 KiB
ArmAsm
;Edited to have duplicate labels (PROJ_ZERO, DPCODE).
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.setcpu "65816"
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CONST_ZERO = $f0 ;project const
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PROJ_ZERO = $00 ;project addr
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PROJ_ONE = $01 ;project addr
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; .segment "SEG000"
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.org $1000
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.a8
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.i8
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ldy PROJ_ZERO
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lda (PROJ_ONE),y
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sta $03 ;could be PROJ_ONE+2, but "nearby" is off
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ldx $04
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lda CONST_ZERO,S
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sta $f1,S
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VAR_ZERO .set $00
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VAR_TWO .set $02
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VAR_THREE .set $03
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CONST_ZERO_VAR .set $f0
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ldy VAR_ZERO
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lda (VAR_ZERO+1),y
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sta VAR_THREE
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ldx $04
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lda CONST_ZERO_VAR,S
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sta $f1,S
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eor 0
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ora 240,S
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PROJ_ZERO_DUP1 .set $10 ;clash with project symbol
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DPCODE_DUP1 .set $80 ;clash with user label
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lda VAR_ZERO
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lda VAR_ZERO+1
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lda VAR_TWO
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lda VAR_THREE
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lda $04
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lda PROJ_ZERO_DUP1
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lda $11
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lda z:DPCODE
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ldx PROJ_ZERO
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ldx PROJ_ONE
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ldx $02
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bit $ffa9
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ldy PROJ_ZERO
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ldy PROJ_ONE
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ldy $02
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.byte $2c
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NH0 .set $00 ;not hidden
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NH1 .set $01 ;not hidden
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L103C: lda #$fe
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beq L103C
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ldy NH0
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ldy NH1
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ldy $02
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nop
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PTR0 .set $10
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CONST0 .set $10
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lda PTR0
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ldx PTR0+1
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ldy $12
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lda (CONST0,S),y
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sta (CONST0+3,S),y
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;Test name redefinition. This is mostly of interest for assemblers without
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;redefinable variables, but also of interest to the cross-reference window.
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PTR .set $20 ;#1
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ldx PTR
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PTR .set $22 ;#2
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ldx PTR
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PTR .set $24 ;#3
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ldx PTR
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PTR_1: nop
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PTR_A .set $20
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ldy PTR_A
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PTR_B .set $1f
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ldy PTR_B+1
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PTR_C .set $1d
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ldy PTR_C+3
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PTR_D .set $21
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ldy PTR_C+3
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VAL0 .set $30
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VAL1 .set $31
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VAL2 .set $32
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VAL3 .set $33
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VAL4 .set $34
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VAL5 .set $35
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and VAL0
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and VAL1
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and VAL2
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and VAL3
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and VAL4
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and VAL5
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VAL14 .set $31
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and VAL0
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and VAL14
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and VAL14+1
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and VAL14+2
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and VAL14+3
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and VAL5
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DPNOP .set $80 ;same as org
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lda z:DPCODE
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jsr DPCODE
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rts
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; .segment "SEG001"
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.org $0080
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DPCODE: nop
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lda DPCODE
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lda a:DPCODE
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lda f:DPCODE
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SPLIT1: lda #','
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SPLITTER .set $80
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ldx $1234
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beq SPLIT1
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@SPLIT2: lda ','
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ldx $5678
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beq @SPLIT2
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nop
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clc
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xce
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rep #$30
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.a16
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.i16
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pea STRING >> 16
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pea STRING
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jsl STRLEN
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sec
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xce
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.a8
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.i8
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jmp L00E6
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STRING: .byte "testing"
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.byte $00
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LEN .set $f2
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PTR .set $f4
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ARG .set $fd
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.a16
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.i16
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STRLEN: phd
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tsc
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sec
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sbc #$00f7
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tcd
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adc #$00f0
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tcs
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stz LEN
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@L00C1: ldx ARG+2
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lda ARG
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inc ARG
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bne @L00CB
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inc ARG+2
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@L00CB: sta PTR
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stx PTR+2
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lda [PTR]
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and #$00ff
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beq @L00DA
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inc LEN
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bra @L00C1
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@L00DA: lda LEN
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tay
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tdc
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clc
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adc #$00f7
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tcs
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tya
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pld
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rtl
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.a8
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.i8
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L00E6: bit ARG+2
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bit a:$00ff
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bit $0100
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rts
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