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blockdev: fix broken blkSeek/blkTell

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scas didn't warn about this, but it seems that `jr` calls were out of
range. Seek and Tell was broken. Replacing `jr` with `jp` does the
trick.
This commit is contained in:
Virgil Dupras 2019-05-12 13:57:37 -04:00
parent c77d96da22
commit 1ea5bedb4f
1 changed files with 19 additions and 15 deletions
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34
parts/z80/blockdev.asm
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@ -37,6 +37,8 @@
;
; Tell:
; Return the position of the "pointer" in HL
;
; All routines are expected to preserve unused registers.
; *** DEFINES ***
@ -69,8 +71,9 @@ blkSel:
push af
push de
push hl
ld hl, blkDevTbl
cp 0
or a ; cp 0
jr z, .afterloop ; index is zero? don't loop
push bc
ld b, a
@ -81,31 +84,32 @@ blkSel:
pop bc
.afterloop:
push hl
call intoHL
call writeHLinDE
inc de
inc de
call intoHL
call writeHLinDE
inc de
inc de
pop hl
inc hl
inc hl
push hl
call intoHL
call writeHLinDE
inc de
inc de
call intoHL
call writeHLinDE
inc de
inc de
pop hl
inc hl
inc hl
push hl
call intoHL
call writeHLinDE
inc de
inc de
call intoHL
call writeHLinDE
inc de
inc de
pop hl
inc hl
inc hl
call intoHL
call writeHLinDE
pop hl
pop de
pop af
@ -236,12 +240,12 @@ _blkSeek:
ld hl, 0xffff
.seek:
pop de
jr _blkCall
jp _blkCall
; Returns the current position of the selected device in HL.
blkTell:
ld ix, (BLOCKDEV_TELL)
jr _blkCall
jp _blkCall
; This label is at the end of the file on purpose: the glue file should include
; a list of device routine table entries just after the include. Each line