From f028be21e61a2044073b58add55202dfd7b0fb6b Mon Sep 17 00:00:00 2001
From: briggs <briggs@NetBSD.org>
Date: Sun, 5 Nov 1995 04:23:00 +0000
Subject: [PATCH] Update from Ken Nakata.

---
 sys/arch/m68k/fpe/README | 30 ++++++++++++++++++------------
 1 file changed, 18 insertions(+), 12 deletions(-)

diff --git a/sys/arch/m68k/fpe/README b/sys/arch/m68k/fpe/README
index 8044af64195b..2605d310b801 100644
--- a/sys/arch/m68k/fpe/README
+++ b/sys/arch/m68k/fpe/README
@@ -1,7 +1,7 @@
-* $NetBSD: README,v 1.3 1995/11/05 00:35:09 briggs Exp $
+* $NetBSD: README,v 1.4 1995/11/05 04:23:00 briggs Exp $
 * NetBSD/m68k FPE (floating point emulation) README file
-* Created Oct/??/95 by kenn@romulus.rutgers.edu (Ken Nakata)
-* Last updated Nov/02/95 by kenn
+* Created Oct/??/95 by kenn@remus.rutgers.edu (Ken Nakata)
+* Last updated Nov/04/95 by kenn
 
 1. INSTALLATION AND COMPILATION
 
@@ -16,8 +16,7 @@ debugging purpose, add "options DEBUG_WITH_FPU" as well.
 NOTE:  If you add "options DEBUG_WITH_FPU", FPE will accept cpID=6 as
 emulated FPU.  You will need a modified gas that generates cpID=6 for
 floating point instructions, instead of normal cpID=1.  Mount unionfs
-or copy the gas source directory as you did with the kernel source tree,
-and apply the following patch:
+or copy the gas source directory and apply the following patch:
 
 *** /usr/src/gnu/usr.bin/gas/config/tc-m68k.c   Mon Nov 21 16:30:41 1994
 --- gas/config/tc-m68k.c    Fri Sep 29 07:59:06 1995
@@ -58,15 +57,15 @@ than welcome to write such functions if you wish to.
 3. IMPLEMENTED INSTRUCTIONS
 
 This is the list of implemented and unimplemented FPU instructions.
-Most 040's directly supported type 0 instructions are already
-implemented except FSGLDIV, FSGLMUL, FMOVE(M) FPcr, and FMOVECR.
+All 040's directly supported type 0 instructions are already
+implemented except FSGLDIV and FSGLMUL.
 
 Type field = bit 8-6 of opcode word
 
 * Implemented Instructions
 
 Type=0: FMOVE (mem->FPr), FINT, FINTRZ, FSQRT, FABS, FNEG, FGETEXP,
-	FGETMAN, FDIV, FADD, FMUL, FSGLDIV, FSCALE, FSGLMUL, FSUB,
+	FGETMAN, FDIV, FADD, FMUL, FSGLDIV(*), FSCALE, FSGLMUL(*), FSUB,
 	FCMP, FTST, FMOVE (FPr->mem), FMOVEM (FPr), FMOVEM (FPcr),
 	FMOVECR, FLOGNP1, FLOGN, FLOG10, FLOG2, FMOD, FREM
 
@@ -154,8 +153,15 @@ the following rules:
 	5) Condition code need not be calculated.  It's taken care of in
 	fpu_emul_arith().
 
-Actually, after above was written, stubs for the missing functions
-are added to the source, so you do not have to change fpu_emul_arith()
-at all.  Function names and prototypes are in fpu_arith_proto.h, and
-all (except fpu_sincos()) follows the rules above.
+Actually, after above was written, stubs for the missing functions were
+added to the source, so you do not have to change fpu_emul_arith() at
+all.  Function names and prototypes are in fpu_arith_proto.h, and all
+except fpu_sincos() follow the rules above.  fpu_sincos() is declared
+as
 
+	struct fpn *fpu_sincos(struct fpemu *fe, int cosreg);
+
+where cosreg is the FP register number to which cosine of the argument
+is calculated and assigned.  Sine of the argument is stored into the
+destination register in the same manner as the other arithmetic
+functions.