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78 lines
1.6 KiB
ArmAsm
78 lines
1.6 KiB
ArmAsm
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;
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; common iocb setup routine for read, write
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; expects parameters (int fd,void *buf,int count)
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;
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.include "atari.inc"
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.include "../common/errno.inc"
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.importzp tmp2,tmp3
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.import incsp6,ldaxysp
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.import __errno,__oserror
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.import fdtoiocb
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.export __rwsetup
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__rwsetup:
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ldy #5
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jsr ldaxysp ; get fd
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jsr fdtoiocb ; convert to iocb
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bmi iocberr
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; asl a ; iocb # --> iocb index
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; asl a
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; asl a
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; asl a
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sta tmp3 ; save it
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ldy #1
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jsr ldaxysp ; get size
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php ; save cond codes, for zero-ness
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stx tmp2
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ldx tmp3 ; iocb
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cpx #$80 ; iocb must be 0...7
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bcs iocberr
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sta ICBLL,x
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lda tmp2 ; size hi
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sta ICBLH,x
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ldy #3 ; get buf addr (was 2 in orig. version)
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jsr ldaxysp
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stx tmp2
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ldx tmp3
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sta ICBAL,x
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lda tmp2
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sta ICBAH,x
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jsr incsp6 ; pop args
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plp
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rts
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iocberr:jsr incsp6 ; pop args
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plp ; throw away
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ldx #$FF ; indicate error + clear ZF
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rts
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;
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; this routine updates errno. do a JMP here right after calling
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; CIOV. we expect status in Y.
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;
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.export __do_oserror,__seterrno,__inviocb
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__do_oserror:
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sty __oserror ; save os dependent error code
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retminus:
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lda #$FF
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tax ; return -1
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rts
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__seterrno:
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sta __errno
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stx __errno+1
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rts
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;
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; sets EINVAL error code and returns -1
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;
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__inviocb:
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lda #<EINVAL
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ldx #>EINVAL
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jsr __seterrno
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jmp retminus ; return -1
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