8f4a1f3a83
the 32bit images on amd64. Change the semantic of the PCB_32BIT pcb flag to request the context switch code to operate on the segment registers. Its previous meaning of saving or restoring the %gs base offset is assigned to the new PCB_GS32BIT flag. FreeBSD 32bit image activator sets the PCB_32BIT flag, while Linux 32bit emulation sets PCB_32BIT | PCB_GS32BIT. Reviewed by: peter MFC after: 2 weeks
92 lines
3.0 KiB
C
92 lines
3.0 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_cr3;
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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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u_long pcb_flags;
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u_int32_t pcb_ds;
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u_int32_t pcb_es;
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u_int32_t pcb_fs;
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u_int32_t pcb_gs;
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u_int64_t pcb_dr0;
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u_int64_t pcb_dr1;
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u_int64_t pcb_dr2;
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u_int64_t pcb_dr3;
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u_int64_t pcb_dr6;
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u_int64_t pcb_dr7;
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struct savefpu pcb_save;
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#define PCB_DBREGS 0x02 /* process using debug registers */
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#define PCB_FPUINITDONE 0x08 /* fpu 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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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_gs32p;
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struct user_segment_descriptor pcb_gs32sd;
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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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void savectx(struct pcb *);
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#endif
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#endif /* _AMD64_PCB_H_ */
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