Mercurial > hg > Members > kono > nitros9-code

view lib/kreiderclib/lseek.as @ 3226:9749d0dfc4a2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Changed a puls PC to rts to save cycles
author David Ladd <drencor-xeen@users.sourceforge.net>
date Sat, 20 Jan 2018 19:32:22 -0600
parents 1647f1874cdf
children
line wrap: on
line source

* Disassembly by Os9disasm of lseek.r

 section code

* OS-9 system function equates

I$Seek equ $88 
I$GetStt equ $8d 

lseek: pshs  u 
 ldd   10,s 
 bne   L000e 
 ldu   #0 
 ldx   #0 
 bra   L0042 
L000e cmpd  #1 
 beq   L0039 
 cmpd  #2 
 beq   L002e 
 ldb   #247 
L001c clra   
 std   errno,y 
 ldd   #-1 
 leax  _flacc,y 
 std   ,x 
 std   2,x 
 puls  u,pc 
L002e lda   5,s 
 ldb   #2 
 os9 I$GetStt 
 bcs   L001c 
 bra   L0042 
L0039 lda   5,s 
 ldb   #5 
 os9 I$GetStt 
 bcs   L001c 
L0042 tfr   u,d 
 addd  8,s 
 std   _flacc+2,y 
 tfr   d,u 
 tfr   x,d 
 adcb  7,s 
 adca  6,s 
 bmi   L001c 
 tfr   d,x 
 std   _flacc,y 
 lda   5,s 
 os9 I$Seek 
 bcs   L001c 
 leax  _flacc,y 
 puls  u,pc 

 endsect