1f0fa5e154
only for exceptions. While adding this to exception_save and exception_restore, it was hard to find a good place to put the instructions. The code sequence was sufficiently arbitrarily ordered that the density was low (roughly 67%). No explicit bundling was used. Thus, I rewrote the functions to optimize for density (close to 80% now), and added explicit bundles and nop instructions. The immediate operand on the nop instruction has been incremented with each instance, to make debugging a bit easier when looking at recurring patterns. Redundant stops have been removed as much as possible. Future optimizations can focus more on performance. A well-placed lfetch can make all the difference here! Also, the FRAME_Fxx defines in frame.h were mostly bogus. FRAME_F10 to FRAME_F15 were copied from FRAME_F9 and still had the same index. We don't use them yet, so nothing was broken.
116 lines
3.2 KiB
C
116 lines
3.2 KiB
C
/*-
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* Copyright (c) 2000 Doug Rabson
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* 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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_FRAME_H_
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#define _MACHINE_FRAME_H_
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#include <machine/reg.h>
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/*
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* Software trap, exception, and syscall frame.
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*/
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struct trapframe {
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u_int64_t tf_flags;
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#define FRAME_SYSCALL 1 /* syscalls use a partial trapframe */
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u_int64_t tf_cr_iip;
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u_int64_t tf_cr_ipsr;
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u_int64_t tf_cr_isr;
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u_int64_t tf_cr_ifa;
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u_int64_t tf_pr;
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u_int64_t tf_ar_rsc;
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u_int64_t tf_ar_pfs;
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u_int64_t tf_cr_ifs;
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u_int64_t tf_ar_bspstore;
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u_int64_t tf_ar_rnat;
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u_int64_t tf_ndirty;
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u_int64_t tf_ar_unat;
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u_int64_t tf_ar_ccv;
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u_int64_t tf_ar_fpsr;
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u_int64_t tf_ar_lc;
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u_int64_t tf_ar_ec;
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u_int64_t tf_b[8];
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u_int64_t tf_r[31]; /* don't need to save r0 */
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#define FRAME_R1 0
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#define FRAME_R2 1
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#define FRAME_R3 2
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#define FRAME_R4 3
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#define FRAME_R5 4
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#define FRAME_R6 5
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#define FRAME_R7 6
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#define FRAME_R8 7
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#define FRAME_R9 8
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#define FRAME_R10 9
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#define FRAME_R11 10
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#define FRAME_R12 11
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#define FRAME_R13 12
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#define FRAME_R14 13
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#define FRAME_R15 14
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#define FRAME_R16 15
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#define FRAME_R17 16
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#define FRAME_R18 17
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#define FRAME_R19 18
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#define FRAME_R20 19
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#define FRAME_R21 20
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#define FRAME_R22 21
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#define FRAME_R23 22
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#define FRAME_R24 23
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#define FRAME_R25 24
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#define FRAME_R26 25
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#define FRAME_R27 26
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#define FRAME_R28 27
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#define FRAME_R29 28
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#define FRAME_R30 29
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#define FRAME_R31 30
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#define FRAME_GP FRAME_R1
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#define FRAME_SP FRAME_R12
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#define FRAME_TP FRAME_R13
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/*
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* We rely on the compiler to save/restore f2-f5 and
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* f16-f31. We also tell the compiler to avoid f32-f127
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* completely so we don't worry about them at all.
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*/
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struct ia64_fpreg tf_f[10];
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#define FRAME_F6 0
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#define FRAME_F7 1
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#define FRAME_F8 2
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#define FRAME_F9 3
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#define FRAME_F10 4
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#define FRAME_F11 5
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#define FRAME_F12 6
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#define FRAME_F13 7
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#define FRAME_F14 8
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#define FRAME_F15 9
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};
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#endif /* _MACHINE_FRAME_H_ */
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