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Bugfixes for emulated instructions MOVTC and MOVTUC, from Bertram Barth: 

> - condition-codes should be set from (unmodified) srclen vs. dstlen
>   instead from the modified (register-) values after completion.
>
> - for MOVTUC the V-bit should be set if the esc-char was found.
>
> - the arguments for comparison should be reversed.
>
> - count is unsigned word, but for condition-codes the comparison
>   should be done with signed words (ie. N = srclen LSS dstlen)
This commit is contained in:
ragge 2003-11-30 10:02:21 +00:00
parent 092f7d2e16
commit 86f405ed49
1 changed files with 12 additions and 6 deletions
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18
sys/arch/vax/vax/emulate.S
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@ -1,4 +1,4 @@
/* $NetBSD: emulate.S,v 1.3 2003/08/07 16:30:18 agc Exp $ */
/* $NetBSD: emulate.S,v 1.4 2003/11/30 10:02:21 ragge Exp $ */
/*
* Copyright (c) 1986, 1987 The Regents of the University of California.
* All rights reserved.
@ -126,7 +126,7 @@ Lmovtc_2loop:
movb %r11,(%r5)+
sobgtr %r4,Lmovtc_2loop
Lmovtc_out:
cmpl %r4,%r0
cmpw arg1,arg5
savepsl
clrl %r2
return
@ -140,21 +140,27 @@ ALTENTRY(EMmovtuc)
argl(4,%r3) # (4) table address == %r3
argl(6,%r5) # (6) destination address == %r5
arguw(5,%r4) # (5) destination length == %r4
jeql Lmovtuc_out
jeql Lmovtuc_out1
Lmovtuc_loop:
tstl %r0
jeql Lmovtuc_out
jeql Lmovtuc_out1
movzbl (%r1),%r2
movzbl (%r3)[%r2],%r2
cmpl %r2,%r11
jeql Lmovtuc_out
jeql Lmovtuc_out2
movzbl (%r1)+,%r2
movb (%r3)[%r2],(%r5)+
decl %r0
sobgtr %r4,Lmovtuc_loop
Lmovtuc_out1:
clrl %r2 # clear V-bit
brb Lmovtuc_out
Lmovtuc_out2:
movl $2,%r2 # set V-bit
Lmovtuc_out:
cmpl %r4,%r0
cmpw arg1,arg5
savepsl
bisl2 %r2,4(%sp) # merge V-bit into psl
clrl %r2
return