fa878ec311
On amd64, arm64 and i386, we have the possibility to switch between TLS areas in userspace. The nice thing about this is that it makes it easier to do light-weight threading, if we ever feel like doing that. On armv6, let's go into the same direction by making it possible to safely use the TPIDRURW register, which is intended for this purpose. Clean up the ARMv6 code to remove md_tp entirely. Simply add a dedicated field to the PCB to hold the value of TPIDRURW across context switches, like we do for any other register. As userspace currently uses the read-only TPIDRURO register, simply ensure that we keep both values in sync where possible. The system calls for modifying the read-only register will simply write the intended value into both registers, so that it lazily ends up in the PCB during the next context switch. Reviewed by: https://reviews.freebsd.org/D7951 Approved by: andrew Reviewed by: imp Differential Revision: https://reviews.freebsd.org/D7951
140 lines
3.7 KiB
C
140 lines
3.7 KiB
C
/* $NetBSD: frame.h,v 1.5 2002/10/19 00:10:54 bjh21 Exp $ */
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/*-
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* Copyright (c) 1994-1997 Mark Brinicombe.
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* Copyright (c) 1994 Brini.
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* All rights reserved.
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*
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* This code is derived from software written for Brini by Mark Brinicombe
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Brini.
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* 4. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL BRINI 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)
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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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* RiscBSD kernel project
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*
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* frame.h
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*
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* Stack frames structures
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*
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* Created : 30/09/94
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*
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* $FreeBSD$
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*
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*/
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#ifndef _MACHINE_FRAME_H_
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#define _MACHINE_FRAME_H_
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#ifndef _LOCORE
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#include <sys/signal.h>
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#include <sys/ucontext.h>
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/*
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* Trap frame. Pushed onto the kernel stack on a trap (synchronous exception).
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*/
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struct trapframe {
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register_t tf_spsr; /* Zero on arm26 */
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register_t tf_r0;
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register_t tf_r1;
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register_t tf_r2;
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register_t tf_r3;
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register_t tf_r4;
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register_t tf_r5;
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register_t tf_r6;
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register_t tf_r7;
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register_t tf_r8;
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register_t tf_r9;
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register_t tf_r10;
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register_t tf_r11;
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register_t tf_r12;
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register_t tf_usr_sp;
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register_t tf_usr_lr;
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register_t tf_svc_sp; /* Not used on arm26 */
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register_t tf_svc_lr; /* Not used on arm26 */
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register_t tf_pc;
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register_t tf_pad;
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};
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/* Register numbers */
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#define tf_r13 tf_usr_sp
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#define tf_r14 tf_usr_lr
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#define tf_r15 tf_pc
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/*
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* Signal frame. Pushed onto user stack before calling sigcode.
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* The pointers are used in the trampoline code to locate the ucontext.
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*/
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struct sigframe {
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siginfo_t sf_si; /* actual saved siginfo */
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ucontext_t sf_uc; /* actual saved ucontext */
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};
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/*
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* Switch frame.
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*
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* It is important this is a multiple of 8 bytes so the stack is correctly
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* aligned when we create new threads.
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*/
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struct switchframe
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{
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register_t sf_r4;
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register_t sf_r5;
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register_t sf_r6;
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register_t sf_r7;
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register_t sf_r8;
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register_t sf_r9;
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register_t sf_r10;
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register_t sf_r11;
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register_t sf_r12;
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register_t sf_sp;
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register_t sf_lr;
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register_t sf_pc;
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#if __ARM_ARCH >= 6
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register_t sf_tpidrurw;
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register_t sf_spare0;
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#endif
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};
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/*
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* Stack frame. Used during stack traces (db_trace.c)
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*/
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struct frame {
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u_int fr_fp;
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u_int fr_sp;
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u_int fr_lr;
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u_int fr_pc;
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};
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#endif /* !_LOCORE */
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#endif /* _MACHINE_FRAME_H_ */
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