[src/trunk]: src/sys/arch/mips/mips Make claried MDP_FPUSED usage.

[nisimura <nisimura%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/cd74b84c5766
branches:  trunk
changeset: 486815:cd74b84c5766
user:      nisimura <nisimura%NetBSD.org@localhost>
date:      Mon May 29 09:16:36 2000 +0000

description:
Make claried MDP_FPUSED usage.
- MDP_FPUSED flag indicates the process has executed at least one
  FP insn during its life time.
- pcb_fpregs storage is guaranteed zero initialzed.  If the process is FPA
  owner, savefpregs() must be called to synchronize it with FPA contents.
- No necessity to save FPA contents into pcb_fpregs prior to the whole
  storage is overwritten by process_write_fpregs().

diffstat:

 sys/arch/mips/mips/process_machdep.c |  23 ++++++-----------------
 1 files changed, 6 insertions(+), 17 deletions(-)

diffs (56 lines):

diff -r bf145b55f47c -r cd74b84c5766 sys/arch/mips/mips/process_machdep.c
--- a/sys/arch/mips/mips/process_machdep.c      Mon May 29 08:56:01 2000 +0000
+++ b/sys/arch/mips/mips/process_machdep.c      Mon May 29 09:16:36 2000 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: process_machdep.c,v 1.14 2000/03/28 03:11:28 simonb Exp $      */
+/*     $NetBSD: process_machdep.c,v 1.15 2000/05/29 09:16:36 nisimura Exp $    */
 
 /*
  * Copyright (c) 1994 Adam Glass
@@ -42,7 +42,7 @@
  */
 
 #include <sys/cdefs.h>                 /* RCS ID & Copyright macro defns */
-__KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.14 2000/03/28 03:11:28 simonb Exp $");
+__KERNEL_RCSID(0, "$NetBSD: process_machdep.c,v 1.15 2000/05/29 09:16:36 nisimura Exp $");
 
 /*
  * This file may seem a bit stylized, but that so that it's easier to port.
@@ -110,16 +110,11 @@
        struct proc *p;
        struct fpreg *regs;
 {
-       if (p->p_md.md_flags & MDP_FPUSED) {
 #if !defined(NOFPU) && !defined(SOFTFLOAT)
-               if (p == fpcurproc)
-                       savefpregs(p);
+       if ((p->p_md.md_flags & MDP_FPUSED) && p == fpcurproc)
+               savefpregs(p);
 #endif
-               memcpy(regs, &p->p_addr->u_pcb.pcb_fpregs,
-                       sizeof(struct fpreg));
-       }
-       else
-               memset(regs, 0, sizeof(struct fpreg));
+       memcpy(regs, &p->p_addr->u_pcb.pcb_fpregs, sizeof(struct fpreg));
        return 0;
 }
 
@@ -128,16 +123,10 @@
        struct proc *p;
        struct fpreg *regs;
 {
+#if 0  /* no FP insn is executed yet */
        if ((p->p_md.md_flags & MDP_FPUSED) == 0)       /* XXX */
                return EINVAL;
-
-#if !defined(NOFPU) && !defined(SOFTFLOAT)
-       if (p->p_md.md_flags & MDP_FPUSED) {
-               if (p == fpcurproc)
-                       savefpregs(p);
-       }
 #endif
-
        memcpy(&p->p_addr->u_pcb.pcb_fpregs, regs, sizeof(struct fpreg));
        return 0;
 }