NetBSD/lib/libc/arch/arm32/fplib/fplib_glue.S

160 lines
4.5 KiB
ArmAsm

/* $NetBSD: fplib_glue.S,v 1.1 1997/10/12 21:18:08 mark Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Neil A. Carson and Mark Brinicombe
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <machine/asm.h>
#define SIGN_BIT_TWIDDLE 0x80000000
/********************************* COMPARISONS ********************************/
/*
* 'Equal' wrapper. This returns 0 if the numbers are equal, or (1 | -1)
* otherwise. So we need to invert the output.
*/
ENTRY(__eqsf2)
stmfd sp!, {lr}
bl _float32_eq
eor r0, r0, #1
ldmfd sp!, {pc}
ENTRY(__eqdf2)
stmfd sp!, {lr}
bl _float64_eq
eor r0, r0, #1
ldmfd sp!, {pc}
/*
* 'Not Equal' wrapper. This returns -1 or 1 (say, 1!) if the numbers are
* not equal, 0 otherwise. However no not equal call is provided, so we have
* to use an 'equal' call and invert the result. The result is already
* inverted though! Confusing?!
*/
ENTRY(__nesf2)
stmfd sp!, {lr}
bl _float32_eq
eor r0, r0, #1
ldmfd sp!, {pc}
ENTRY(__nedf2)
stmfd sp!, {lr}
bl _float64_eq
eor r0, r0, #1
ldmfd sp!, {pc}
/*
* 'Greater Than' wrapper. This returns 1 if the number is greater, 0
* or -1 otherwise. Unfortunately, no such function exists. We have to
* instead compare the numbers using the 'less than' calls in order to
* make up our mind. This means that we can call 'less than or equal' and
* invert the result.
*/
ENTRY(__gtsf2)
stmfd sp!, {lr}
bl _float32_le
eor r0, r0, #1
ldmfd sp!, {pc}
ENTRY(__gtdf2)
stmfd sp!, {lr}
bl _float64_le
eor r0, r0, #1
ldmfd sp!, {pc}
/*
* 'Greater Than or Equal' wrapper. We emulate this by inverting the result
* of a 'less than' call.
*/
ENTRY(__gesf2)
stmfd sp!, {lr}
bl _float32_lt
eor r0, r0, #1
cmp r0, #0
mvneq r0, #0
ldmfd sp!, {pc}
ENTRY(__gedf2)
stmfd sp!, {lr}
bl _float64_lt
eor r0, r0, #1
cmp r0, #0
mvneq r0, #0
ldmfd sp!, {pc}
/*
* 'Less Than' wrapper. A 1 from the ARM code needs to be turned into -1.
*/
ENTRY(__ltsf2)
stmfd sp!, {lr}
bl _float32_lt
cmp r0, #1
mvneq r0, #0
ldmfd sp!, {pc}
ENTRY(__ltdf2)
stmfd sp!, {lr}
bl _float64_lt
cmp r0, #1
mvneq r0, #0
ldmfd sp!, {pc}
/*
* 'Less Than or Equal' wrapper. A 0 must turn into a 1, and a 1 into a 0.
*/
ENTRY(__lesf2)
stmfd sp!, {lr}
bl _float32_le
eor r0, r0, #1
ldmfd sp!, {pc}
ENTRY(__ledf2)
stmfd sp!, {lr}
bl _float64_le
eor r0, r0, #1
ldmfd sp!, {pc}
/*
* Float negate... This isn't provided by the library, but it's hardly the
* hardest function in the world to write... :) In fact, because of the
* position in the registers of arguments, the double precision version can
* go here too ;-)
*/
ENTRY(__negsf2)
ENTRY(__negdf2)
eor r0, r0, #SIGN_BIT_TWIDDLE
mov pc, lr