e406235000
RIght now PCB_KERNFPU is used both as indication that kernel prepared hardware FPU context to use and that the thread is fpu-kern thread. This also breaks fpu_kern_enter(FPU_KERN_NOCTX), since fpu_kern_leave() then clears PCB_KERNFPU. Introduce new flag PCB_KERNFPU_THR which indicates that the thread is fpu-kern. Do not clear PCB_KERNFPU if fpu-kern thread leaves noctx fpu region. Reported and tested by: jhb (amd64) Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D25511
120 lines
3.6 KiB
C
120 lines
3.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* from: @(#)pcb.h 5.10 (Berkeley) 5/12/91
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* $FreeBSD$
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*/
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#ifndef _I386_PCB_H_
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#define _I386_PCB_H_
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/*
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* Intel 386 process control block
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*/
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#ifndef _KERNEL
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#include <machine/segments.h>
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#endif
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#include <machine/npx.h>
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/*
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* NB: The fields marked with (*) are used by kernel debuggers. Their
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* ABI should be preserved.
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*/
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struct pcb {
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int pcb_edi; /* (*) */
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int pcb_esi; /* (*) */
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int pcb_ebp; /* (*) */
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int pcb_esp; /* (*) */
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int pcb_ebx; /* (*) */
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int pcb_eip; /* (*) */
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struct segment_descriptor pcb_fsd;
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struct segment_descriptor pcb_gsd;
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int pcb_ds;
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int pcb_es;
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int pcb_fs;
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int pcb_gs;
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int pcb_ss;
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int pcb_cr0;
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int pcb_cr2;
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int pcb_cr3;
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int pcb_cr4;
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int pcb_dr0;
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int pcb_dr1;
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int pcb_dr2;
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int pcb_dr3;
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int pcb_dr6;
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int pcb_dr7;
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struct region_descriptor pcb_gdt;
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struct region_descriptor pcb_idt;
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uint16_t pcb_ldt;
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uint16_t pcb_tr;
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u_int pcb_flags;
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#define PCB_DBREGS 0x02 /* process using debug registers */
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#define PCB_KERNNPX_THR 0x04 /* fpu_kern_thread() */
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#define PCB_NPXINITDONE 0x08 /* fpu state is initialized */
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#define PCB_VM86CALL 0x10 /* in vm86 call */
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#define PCB_NPXUSERINITDONE 0x20 /* user fpu state is initialized */
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#define PCB_KERNNPX 0x40 /* kernel uses npx */
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#define PCB_NPXNOSAVE 0x80 /* no save area for current FPU ctx */
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uint16_t pcb_initial_npxcw;
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caddr_t pcb_onfault; /* copyin/out fault recovery */
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struct pcb_ext *pcb_ext; /* optional pcb extension */
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int pcb_waspsl; /* unused padding for ABI and API compat */
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u_long pcb_vm86[2]; /* vm86bios scratch space */
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union savefpu *pcb_save;
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uint32_t pcb_pad[10];
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};
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/* Per-CPU state saved during suspend and resume. */
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struct susppcb {
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struct pcb sp_pcb;
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/* fpu context for suspend/resume */
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void *sp_fpususpend;
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};
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#ifdef _KERNEL
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struct trapframe;
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void makectx(struct trapframe *, struct pcb *);
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int savectx(struct pcb *) __returns_twice;
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void resumectx(struct pcb *) __fastcall;
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#endif
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#endif /* _I386_PCB_H_ */
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