0a35b40f8d
Previously, DBCR0 flags were set "globally", but this leads to problems because Book-E fine grained debug settings work only in conjuction with the debug master enable bit in MSR: in scenarios when the DBCR0 was set with intention to debug one process, but another one with MSR[DE] set got scheduled, the latter would immediately cause debug exceptions to occur upon execution of its own code instructions (and not the one intended for debugging). To avoid such problems and properly handle debugging context, DBCR0 state should be managed individually per process. Submitted by: Grzegorz Bernacki gjb ! semihalf dot com Reviewed by: marcel
96 lines
3.2 KiB
C
96 lines
3.2 KiB
C
/*-
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* Copyright (C) 1995, 1996 Wolfgang Solfrank.
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* Copyright (C) 1995, 1996 TooLs GmbH.
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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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* 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 TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $NetBSD: frame.h,v 1.2 1999/01/10 10:13:15 tsubai Exp $
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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 <sys/types.h>
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/*
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* We have to save all registers on every trap, because
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* 1. user could attach this process every time
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* 2. we must be able to restore all user registers in case of fork
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* Actually, we do not save the fp registers on trap, since
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* these are not used by the kernel. They are saved only when switching
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* between processes using the FPU.
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*
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* Change ordering to cluster together these register_t's. XXX
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*/
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struct trapframe {
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register_t fixreg[32];
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register_t lr;
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int cr;
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int xer;
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register_t ctr;
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register_t srr0;
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register_t srr1;
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int exc;
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union {
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struct {
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/* dar & dsisr are only filled on a DSI trap */
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register_t dar;
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int dsisr;
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} aim;
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struct {
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register_t dear;
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register_t esr;
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register_t dbcr0;
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} booke;
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} cpu;
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};
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/*
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* This is to ensure alignment of the stackpointer
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*/
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#define FRAMELEN roundup(sizeof(struct trapframe) + 8, 16)
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#define trapframe(td) ((td)->td_frame)
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/*
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* Call frame for PowerPC used during fork.
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*/
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struct callframe {
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register_t cf_dummy_fp; /* dummy frame pointer */
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register_t cf_lr; /* space for link register save */
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register_t cf_func;
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register_t cf_arg0;
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register_t cf_arg1;
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};
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/* Definitions for syscalls */
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#define FIRSTARG 3 /* first arg in reg 3 */
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#define NARGREG 8 /* 8 args in regs */
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#define MOREARGS(sp) ((caddr_t)((int)(sp) + 8)) /* more args go here */
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#endif /* _MACHINE_FRAME_H_ */
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