86f466074c
in asm files. 2. Temporarily cause subnormal operands in floating point operations to be treated as zeros so that comlpetion of the operation does not need to be emulated. 3. Catch fp_exception_other and correctly skip over the unfinished instruction, but basically ignore them. Emulating the instruction is not yet supported. 4. Zero td_retval[1] as well in syscall(). Submitted by: tmm (2, 3)
58 lines
2.0 KiB
C
58 lines
2.0 KiB
C
/*-
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* Copyright 2001 by Thomas Moestl <tmm@FreeBSD.org>. All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_FP_H_
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#define _MACHINE_FP_H_
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/* A block of 8 double-precision (16 single-precision) FP registers. */
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struct fpblock {
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u_long fpq_l[8];
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};
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struct fpstate {
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struct fpblock fp_fb[4];
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u_long fp_fsr;
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u_long fp_fprs;
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};
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#ifdef _KERNEL
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struct pcb;
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struct thread;
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void fp_init_thread(struct pcb *);
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int fp_enable_thread(struct thread *, struct trapframe *);
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int fp_exception_other(struct thread *, struct trapframe *);
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/*
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* Note: The pointers passed to the next two functions must be aligned on
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* 64 byte boundaries.
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*/
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void savefpctx(struct fpstate *);
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void restorefpctx(struct fpstate *);
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#endif /* _KERNEL */
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#endif /* !_MACHINE_FP_H_ */
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