a2d2c83668
savectx() is only used for panic dump (dumppcb) and kdb (stoppcbs). Thus, saving additional information does not hurt and it may be even beneficial. Unfortunately, struct pcb has grown larger to accommodate more data. Move 512-byte long pcb_user_save to the end of struct pcb while I am here. - savectx() now saves FPU state unconditionally and copy it to the PCB of FPU thread if necessary. This gives panic dump and kdb a chance to take a look at the current FPU state even if the FPU is "supposedly" not used. - Resuming CPU now unconditionally reinitializes FPU. If the saved FPU state was irrelevant, it could be in an unknown state. Suggested by: bde [1]
105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
/*-
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* Copyright (c) 2003 Peter Wemm.
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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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* 4. 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 _AMD64_PCB_H_
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#define _AMD64_PCB_H_
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/*
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* AMD64 process control block
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*/
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#include <machine/fpu.h>
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#include <machine/segments.h>
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struct pcb {
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register_t pcb_r15;
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register_t pcb_r14;
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register_t pcb_r13;
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register_t pcb_r12;
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register_t pcb_rbp;
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register_t pcb_rsp;
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register_t pcb_rbx;
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register_t pcb_rip;
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register_t pcb_fsbase;
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register_t pcb_gsbase;
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register_t pcb_kgsbase;
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u_long pcb_flags;
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#define PCB_DBREGS 0x02 /* process using debug registers */
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#define PCB_KERNFPU 0x04 /* kernel uses fpu */
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#define PCB_FPUINITDONE 0x08 /* fpu state is initialized */
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#define PCB_USERFPUINITDONE 0x10 /* fpu user state is initialized */
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#define PCB_GS32BIT 0x20 /* linux gs switch */
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#define PCB_32BIT 0x40 /* process has 32 bit context (segs etc) */
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#define PCB_FULLCTX 0x80 /* full context restore on sysret */
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register_t pcb_cr0;
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register_t pcb_cr2;
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register_t pcb_cr3;
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register_t pcb_cr4;
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register_t pcb_dr0;
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register_t pcb_dr1;
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register_t pcb_dr2;
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register_t pcb_dr3;
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register_t pcb_dr6;
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register_t pcb_dr7;
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uint16_t pcb_initial_fpucw;
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caddr_t pcb_onfault; /* copyin/out fault recovery */
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/* 32-bit segment descriptor */
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struct user_segment_descriptor pcb_gs32sd;
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/* local tss, with i/o bitmap; NULL for common */
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struct amd64tss *pcb_tssp;
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struct savefpu *pcb_save;
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char pcb_full_iret;
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struct region_descriptor pcb_gdt;
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struct region_descriptor pcb_idt;
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struct region_descriptor pcb_ldt;
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uint16_t pcb_tr;
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struct savefpu pcb_user_save;
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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 *);
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#endif
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#endif /* _AMD64_PCB_H_ */
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