osd-contiki/platform/c64/lib/pfs_seek.S
Oliver Schmidt 4f28289df2 Added a pfs_remove() function and a pfs_seek() stub to the Commodore platforms.
- "Normalized" some Assembly code.
- Implemented CFS_APPEND in pfs_open().
- Made CFS_WRITE work in VICE's virtual disk/file system.
2016-03-28 14:07:35 +02:00

46 lines
2 KiB
ArmAsm

;
; Copyright (c) 2016, Greg King
; All rights reserved.
;
; Redistribution and use in source and binary forms, with or without
; modification, are permitted provided that the following conditions
; are met:
; 1. Redistributions of source code must retain the above copyright
; notice, this list of conditions, and the following disclaimer.
; 2. Redistributions in binary form must reproduce the above copyright
; notice, this list of conditions, and the following disclaimer in the
; documentation and/or other materials provided with the distribution.
; 3. Neither the name of the author nor the names of contributors
; may be used to endorse or promote products derived from this software
; without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS"; AND,
; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
; ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
; OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
; HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
; OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
; SUCH DAMAGE.
;
; This file is part of the Contiki operating system.
;
; Author: Greg King <gregdk@users.sf.net>
;
;---------------------------------------------------------------------
.importzp sp, sreg, ptr1, ptr2, ptr3
.import popax, incsp6
.import cmdc, flags
.export _pfs_seek
;---------------------------------------------------------------------
.proc _pfs_seek
lda #<-1 ; seek not implemented
tax
stx sreg ; return long data type
stx sreg+1
jmp incsp6 ; drop int and long arguments from stack
.endproc