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freebsd-dev/lib/libc/arm/aeabi/aeabi_vfp_float.S

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Add an optimised version of the float and double helper functions. These are only used on armv6 when the vfp unit is detected. They will also be available for the upcoming armv6hf platform, however while not used by default there will need to be defined for any software that calls them directly.
2014-03-16 13:16:30 +00:00
/*
* Copyright (C) 2013 Andrew Turner
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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>
__FBSDID("$FreeBSD$");
#include "aeabi_vfp.h"
.fpu vfp
.syntax unified
Add support for the __aeabi_c*cmp* functions. These are similar to the existing functions with the exception they use the condition flags to store the result. Differential Revision: https://reviews.freebsd.org/D872 Silence from: current@ and numerics@ MFC after: 1 week
2014-10-14 14:27:51 +00:00
/* void __aeabi_cfcmpeq(float, float) */
AEABI_ENTRY(cfcmpeq)
LOAD_SREGS(s0, s1, r0, r1)
vcmp.f32 s0, s1
vmrs APSR_nzcv, fpscr
RET
AEABI_END(cfcmpeq)
/* void __aeabi_cfcmple(float, float) */
AEABI_ENTRY(cfcmple)
LOAD_SREGS(s0, s1, r0, r1)
vcmpe.f32 s0, s1
vmrs APSR_nzcv, fpscr
RET
AEABI_END(cfcmple)
/* void __aeabi_cfrcmple(float, float) */
AEABI_ENTRY(cfrcmple)
LOAD_SREGS(s0, s1, r0, r1)
vcmpe.f32 s1, s0
vmrs APSR_nzcv, fpscr
RET
AEABI_END(cfrcmple)
Add an optimised version of the float and double helper functions. These are only used on armv6 when the vfp unit is detected. They will also be available for the upcoming armv6hf platform, however while not used by default there will need to be defined for any software that calls them directly.
2014-03-16 13:16:30 +00:00
/* int __aeabi_fcmpeq(float, float) */
AEABI_ENTRY(fcmpeq)
LOAD_SREGS(s0, s1, r0, r1)
vcmp.f32 s0, s1
vmrs APSR_nzcv, fpscr
Teach bits of libc about Thumb. This adds the if-then instructions needed to handle the ARM conditional execution. While here fix a bug found by this in the hard-float code, cc is the opposite of cs. The former is used for 'less than' in floating-point code and is executed when the C (carry) bit is clear, the latter is used when greater than, equal, or unordered, and is executed when the C bit is set.
2015-05-12 10:03:14 +00:00
ite ne
Add an optimised version of the float and double helper functions. These are only used on armv6 when the vfp unit is detected. They will also be available for the upcoming armv6hf platform, however while not used by default there will need to be defined for any software that calls them directly.
2014-03-16 13:16:30 +00:00
movne r0, #0
moveq r0, #1
RET
AEABI_END(fcmpeq)
/* int __aeabi_fcmplt(float, float) */
AEABI_ENTRY(fcmplt)
LOAD_SREGS(s0, s1, r0, r1)
vcmp.f32 s0, s1
vmrs APSR_nzcv, fpscr
Teach bits of libc about Thumb. This adds the if-then instructions needed to handle the ARM conditional execution. While here fix a bug found by this in the hard-float code, cc is the opposite of cs. The former is used for 'less than' in floating-point code and is executed when the C (carry) bit is clear, the latter is used when greater than, equal, or unordered, and is executed when the C bit is set.
2015-05-12 10:03:14 +00:00
ite cs
Add an optimised version of the float and double helper functions. These are only used on armv6 when the vfp unit is detected. They will also be available for the upcoming armv6hf platform, however while not used by default there will need to be defined for any software that calls them directly.
2014-03-16 13:16:30 +00:00
movcs r0, #0
Teach bits of libc about Thumb. This adds the if-then instructions needed to handle the ARM conditional execution. While here fix a bug found by this in the hard-float code, cc is the opposite of cs. The former is used for 'less than' in floating-point code and is executed when the C (carry) bit is clear, the latter is used when greater than, equal, or unordered, and is executed when the C bit is set.
2015-05-12 10:03:14 +00:00
movcc r0, #1
Add an optimised version of the float and double helper functions. These are only used on armv6 when the vfp unit is detected. They will also be available for the upcoming armv6hf platform, however while not used by default there will need to be defined for any software that calls them directly.
2014-03-16 13:16:30 +00:00
RET
AEABI_END(fcmplt)
/* int __aeabi_fcmple(float, float) */
AEABI_ENTRY(fcmple)
LOAD_SREGS(s0, s1, r0, r1)
vcmp.f32 s0, s1
vmrs APSR_nzcv, fpscr
Teach bits of libc about Thumb. This adds the if-then instructions needed to handle the ARM conditional execution. While here fix a bug found by this in the hard-float code, cc is the opposite of cs. The former is used for 'less than' in floating-point code and is executed when the C (carry) bit is clear, the latter is used when greater than, equal, or unordered, and is executed when the C bit is set.
2015-05-12 10:03:14 +00:00
ite hi
Add an optimised version of the float and double helper functions. These are only used on armv6 when the vfp unit is detected. They will also be available for the upcoming armv6hf platform, however while not used by default there will need to be defined for any software that calls them directly.
2014-03-16 13:16:30 +00:00
movhi r0, #0
movls r0, #1
RET
AEABI_END(fcmple)
/* int __aeabi_fcmpge(float, float) */
AEABI_ENTRY(fcmpge)
LOAD_SREGS(s0, s1, r0, r1)
vcmp.f32 s0, s1
vmrs APSR_nzcv, fpscr
Teach bits of libc about Thumb. This adds the if-then instructions needed to handle the ARM conditional execution. While here fix a bug found by this in the hard-float code, cc is the opposite of cs. The former is used for 'less than' in floating-point code and is executed when the C (carry) bit is clear, the latter is used when greater than, equal, or unordered, and is executed when the C bit is set.
2015-05-12 10:03:14 +00:00
ite lt
Add an optimised version of the float and double helper functions. These are only used on armv6 when the vfp unit is detected. They will also be available for the upcoming armv6hf platform, however while not used by default there will need to be defined for any software that calls them directly.
2014-03-16 13:16:30 +00:00
movlt r0, #0
movge r0, #1
RET
AEABI_END(fcmpge)
/* int __aeabi_fcmpgt(float, float) */
AEABI_ENTRY(fcmpgt)
LOAD_SREGS(s0, s1, r0, r1)
vcmp.f32 s0, s1
vmrs APSR_nzcv, fpscr
Teach bits of libc about Thumb. This adds the if-then instructions needed to handle the ARM conditional execution. While here fix a bug found by this in the hard-float code, cc is the opposite of cs. The former is used for 'less than' in floating-point code and is executed when the C (carry) bit is clear, the latter is used when greater than, equal, or unordered, and is executed when the C bit is set.
2015-05-12 10:03:14 +00:00
ite le
Add an optimised version of the float and double helper functions. These are only used on armv6 when the vfp unit is detected. They will also be available for the upcoming armv6hf platform, however while not used by default there will need to be defined for any software that calls them directly.
2014-03-16 13:16:30 +00:00
movle r0, #0
movgt r0, #1
RET
AEABI_END(fcmpgt)
/* int __aeabi_fcmpun(float, float) */
AEABI_ENTRY(fcmpun)
LOAD_SREGS(s0, s1, r0, r1)
vcmp.f32 s0, s1
vmrs APSR_nzcv, fpscr
Teach bits of libc about Thumb. This adds the if-then instructions needed to handle the ARM conditional execution. While here fix a bug found by this in the hard-float code, cc is the opposite of cs. The former is used for 'less than' in floating-point code and is executed when the C (carry) bit is clear, the latter is used when greater than, equal, or unordered, and is executed when the C bit is set.
2015-05-12 10:03:14 +00:00
ite vc
Add an optimised version of the float and double helper functions. These are only used on armv6 when the vfp unit is detected. They will also be available for the upcoming armv6hf platform, however while not used by default there will need to be defined for any software that calls them directly.
2014-03-16 13:16:30 +00:00
movvc r0, #0
movvs r0, #1
RET
AEABI_END(fcmpun)
/* int __aeabi_f2iz(float) */
AEABI_ENTRY(f2iz)
LOAD_SREG(s0, r0)
#if 0
/*
* This should be the correct instruction, but binutils incorrectly
* encodes it as the version that used FPSCR to determine the rounding.
* When binutils is fixed we can use this again.
*/
vcvt.s32.f32 s0, s0
#else
ftosizs s0, s0
#endif
vmov r0, s0
RET
AEABI_END(f2iz)
/* double __aeabi_f2d(float) */
AEABI_ENTRY(f2d)
LOAD_SREG(s0, r0)
vcvt.f64.f32 d0, s0
UNLOAD_DREG(r0, r1, d0)
RET
AEABI_END(f2d)
/* float __aeabi_i2f(int) */
AEABI_ENTRY(i2f)
vmov s0, r0
vcvt.f32.s32 s0, s0
UNLOAD_SREG(r0, s0)
RET
AEABI_END(i2f)
/* float __aeabi_fadd(float, float) */
AEABI_ENTRY(fadd)
LOAD_SREGS(s0, s1, r0, r1)
vadd.f32 s0, s0, s1
UNLOAD_SREG(r0, s0)
RET
AEABI_END(fadd)
/* float __aeabi_fmul(float, float) */
AEABI_ENTRY(fdiv)
LOAD_SREGS(s0, s1, r0, r1)
vdiv.f32 s0, s0, s1
UNLOAD_SREG(r0, s0)
RET
AEABI_END(fdiv)
/* float __aeabi_fmul(float, float) */
AEABI_ENTRY(fmul)
LOAD_SREGS(s0, s1, r0, r1)
vmul.f32 s0, s0, s1
UNLOAD_SREG(r0, s0)
RET
AEABI_END(fmul)
/* float __aeabi_fsub(float, float) */
AEABI_ENTRY(fsub)
LOAD_SREGS(s0, s1, r0, r1)
vsub.f32 s0, s0, s1
UNLOAD_SREG(r0, s0)
RET
AEABI_END(fsub)
Annotate arm userspace assembler sources stating their tolerance to the non-executable stack. Reviewed by: andrew Sponsored by: The FreeBSD Foundation
2015-09-29 16:09:58 +00:00
.section .note.GNU-stack,"",%progbits
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