160 lines
4.6 KiB
ArmAsm
160 lines
4.6 KiB
ArmAsm
/* $NetBSD: fplib_glue.S,v 1.2 1999/05/06 13:56:28 kleink Exp $ */
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/*-
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* Copyright (c) 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Neil A. Carson and Mark Brinicombe
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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#define SIGN_BIT_TWIDDLE 0x80000000
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/********************************* COMPARISONS ********************************/
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/*
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* 'Equal' wrapper. This returns 0 if the numbers are equal, or (1 | -1)
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* otherwise. So we need to invert the output.
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*/
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ENTRY(__eqsf2)
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stmfd sp!, {lr}
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bl _C_LABEL(_arm32_float32_eq)
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eor r0, r0, #1
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ldmfd sp!, {pc}
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ENTRY(__eqdf2)
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stmfd sp!, {lr}
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bl _C_LABEL(_arm32_float64_eq)
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eor r0, r0, #1
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ldmfd sp!, {pc}
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/*
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* 'Not Equal' wrapper. This returns -1 or 1 (say, 1!) if the numbers are
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* not equal, 0 otherwise. However no not equal call is provided, so we have
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* to use an 'equal' call and invert the result. The result is already
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* inverted though! Confusing?!
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*/
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ENTRY(__nesf2)
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stmfd sp!, {lr}
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bl _C_LABEL(_arm32_float32_eq)
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eor r0, r0, #1
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ldmfd sp!, {pc}
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ENTRY(__nedf2)
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stmfd sp!, {lr}
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bl _C_LABEL(_arm32_float64_eq)
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eor r0, r0, #1
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ldmfd sp!, {pc}
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/*
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* 'Greater Than' wrapper. This returns 1 if the number is greater, 0
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* or -1 otherwise. Unfortunately, no such function exists. We have to
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* instead compare the numbers using the 'less than' calls in order to
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* make up our mind. This means that we can call 'less than or equal' and
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* invert the result.
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*/
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ENTRY(__gtsf2)
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stmfd sp!, {lr}
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bl _C_LABEL(_arm32_float32_le)
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eor r0, r0, #1
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ldmfd sp!, {pc}
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ENTRY(__gtdf2)
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stmfd sp!, {lr}
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bl _C_LABEL(_arm32_float64_le)
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eor r0, r0, #1
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ldmfd sp!, {pc}
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/*
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* 'Greater Than or Equal' wrapper. We emulate this by inverting the result
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* of a 'less than' call.
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*/
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ENTRY(__gesf2)
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stmfd sp!, {lr}
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bl _C_LABEL(_arm32_float32_lt)
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eor r0, r0, #1
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cmp r0, #0
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mvneq r0, #0
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ldmfd sp!, {pc}
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ENTRY(__gedf2)
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stmfd sp!, {lr}
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bl _C_LABEL(_arm32_float64_lt)
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eor r0, r0, #1
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cmp r0, #0
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mvneq r0, #0
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ldmfd sp!, {pc}
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/*
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* 'Less Than' wrapper. A 1 from the ARM code needs to be turned into -1.
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*/
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ENTRY(__ltsf2)
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stmfd sp!, {lr}
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bl _C_LABEL(_arm32_float32_lt)
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cmp r0, #1
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mvneq r0, #0
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ldmfd sp!, {pc}
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ENTRY(__ltdf2)
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stmfd sp!, {lr}
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bl _C_LABEL(_arm32_float64_lt)
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cmp r0, #1
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mvneq r0, #0
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ldmfd sp!, {pc}
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/*
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* 'Less Than or Equal' wrapper. A 0 must turn into a 1, and a 1 into a 0.
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*/
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ENTRY(__lesf2)
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stmfd sp!, {lr}
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bl _C_LABEL(_arm32_float32_le)
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eor r0, r0, #1
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ldmfd sp!, {pc}
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ENTRY(__ledf2)
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stmfd sp!, {lr}
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bl _C_LABEL(_arm32_float64_le)
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eor r0, r0, #1
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ldmfd sp!, {pc}
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/*
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* Float negate... This isn't provided by the library, but it's hardly the
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* hardest function in the world to write... :) In fact, because of the
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* position in the registers of arguments, the double precision version can
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* go here too ;-)
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*/
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ENTRY(__negsf2)
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ENTRY(__negdf2)
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eor r0, r0, #SIGN_BIT_TWIDDLE
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mov pc, lr
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