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Make sure r0 in the saved context is 0.

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This commit is contained in:
matt 2003-01-20 00:24:07 +00:00
parent 94face2f9c
commit 21375ddf92
1 changed files with 9 additions and 8 deletions
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17
lib/libc/arch/vax/gen/swapcontext.S
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@ -1,4 +1,4 @@
/* $NetBSD: swapcontext.S,v 1.1 2003/01/19 19:07:31 matt Exp $ */
/* $NetBSD: swapcontext.S,v 1.2 2003/01/20 00:24:07 matt Exp $ */
/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
@ -39,17 +39,18 @@
#include "SYS.h"
ENTRY(swapcontext, 0)
clrl %r0 /* assume getcontext succeeds */
chmk $SYS_getcontext /* getcontext(oucp) */
jcc 1f
jmp CERROR+2 /* badness happened */
jmp CERROR+2 /* something bad happened */
1: movl 4(%ap),%r0
movl $5,%r1 /* size of callframe (in LW) */
bbc $13,6(%fp),2f /* was this a CALLG? */
1: movl 4(%ap),%r0 /* get oucp */
addl3 (%ap),$(5+1),%r1 /* size of callframe + arglist (LW) */
2: movl 8(%fp),(12*4)(%r0) /* restore AP */
moval (%sp)[%r1],(13*4)(%r0) /* restore SP */
movq 12(%fp),(14*4)(%r0) /* restore FP + PC */
bbs $13,6(%fp),2f /* was this a CALLG? */
movl $5,%r1 /* size of callframe (in LW) */
2: movl 8(%fp),(36+12*4)(%r0) /* restore AP */
moval (%sp)[%r1],(36+13*4)(%r0) /* restore SP */
movq 12(%fp),(36+14*4)(%r0) /* restore FP + PC */
pushl 8(%ap)
calls $1,_C_LABEL(setcontext) /* setcontext(ucp) */