kaif_handlers.s revision 1ae0874509b6811fdde1dfd46f0d93fd09867a3f
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/asm_linkage.h>
#include <sys/machtrap.h>
#include <sys/privregs.h>
#include <vm/mach_sfmmu.h>
#include <sys/machparam.h>
#endif
#if defined(sun4v) && defined(KMDB_TRAPCOUNT)
/*
* The sun4v implemenations of the fast miss handlers are larger than those
* of their sun4u kin. This is unfortunate because there is not enough space
* remaining in the respective trap table entries for this debug feature.
*/
#error "KMDB_TRAPCOUNT not supported on sun4v"
#endif
/*
* This file contains the trap handlers that will be copied to kmdb's trap
* table. See kaif_activate.c for the code that does the actual copying.
*
* The handlers have a debugging feature, enabled when KMDB_TRAPCOUNT is
* defined, which allows them to keep a running count of the number of times
* a given trap has occurred. The counter is stored in the padding at the end
* of the handler. Write access is of course required to allow the values to
* be updated, so KMDB_TRAPCOUNT also enables the installation of DTLB entries
* for each trap table page. Finally, the code in this file is copied into
* the actual location used by the handler, so we can't perform compile-time
* counter location calculations. The calculations are instead performed at
* run-time, as A) we generally already derive the table location as part of
* the trap processing and B) simplicity is more of a concern than is speed.
*/
#if defined(lint)
void
kaif_hdlr_dmiss(void)
{
}
void
kaif_itlb_handler(void)
{
}
#else /* lint */
#ifdef sun4v
/*
* KAIF_ITLB_STUFF
* derived from ITLB_STUFF in uts/sun4v/vm/mach_sfmmu.h
*
* Load ITLB entry
*
* In:
* tte = reg containing tte
* ouch = branch target label used if hcall fails (sun4v only)
* scr1, scr2, scr3, scr4 = scratch registers (must not be %o0-%o3)
*/
MMU_FAULT_STATUS_AREA(%o2); \
ta MMU_MAP_ADDR; \
/* BEGIN CSTYLED */ \
nop; \
/* END CSTYLED */ \
/*
* KAIF_DTLB_STUFF
* derived from DTLB_STUFF in uts/sun4v/vm/mach_sfmmu.h
*
* Load DTLB entry
*
* In:
* tte = reg containing tte
* ouch = branch target label used if hcall fails (sun4v only)
* scr1, scr2, scr3, scr4 = scratch registers (must not be %o0-%o3)
*/
MMU_FAULT_STATUS_AREA(%o2); \
ta MMU_MAP_ADDR; \
/* BEGIN CSTYLED */ \
nop; \
/* END CSTYLED */ \
#else /* sun4v */
#endif /* sun4v */
/*
* KAIF_CALL_KDI_VATOTTE
*
* Use kdi_vatotte to look up the tte. We don't bother stripping the
* context, as it won't change the tte we get.
*
* The two instruction at patch_lbl are modified during runtime
* by kaif to point to kdi_vatotte
*
* Clobbers all globals.
* Returns tte in %g1 if successful, otherwise 0 in %g1
* Leaves address of next instruction following this macro in scr1
*/
patch_lbl: \
/*
* kdi_vatotte gave us a TTE to use. Load it up and head back
* into the world, but first bump a counter.
*/
#ifdef KMDB_TRAPCOUNT /* Trap counter. See top comment */
#endif
1: /*
* kdi_vatotte didn't give us a tte, which is unfortunate. We're
* going to need to jump into the debugger so as to allow it to
* handle the trap. The debugger itself isn't locked into the TLB,
* so we may well incur a TLB miss while trying to get into it. As
* such, we're going to switch off the MMU globals before setting foot
* into the debugger, thus allowing a TL>1 miss to be handled without
* clobbering our state. We'll also save off the tag just in case the
* world ends and someone wants to find out what happened.
*
* We will only reach this point at TL=1, as kdi_vatotte will always
* find the TTE for the debugger without missing.
*/
#ifdef KMDB_TRAPCOUNT /* Trap address "counter". */
#endif
/* NOTREACHED */
#ifdef KMDB_TRAPCOUNT
.align 8
#endif
/*
* kdi_vatotte gave us a TTE to use. Load it up and head back
* into the world, but first bump a counter.
*/
#ifdef KMDB_TRAPCOUNT /* Trap counter. See top comment */
#endif
1: /*
* kdi_vatotte didn't give us a tte, which is unfortunate. We're
* going to need to jump into the debugger so as to allow it to
* handle the trap. The debugger itself isn't locked into the TLB,
* so we may well incur a TLB miss while trying to get into it. As
* such, we're going to switch off the MMU globals before setting foot
* into the debugger, thus allowing a TL>1 miss to be handled without
* clobbering our state.
*
* We will only reach this point at TL=1, as kdi_vatotte will always
* find the TTE for the debugger without missing.
*/
/* NOTREACHED */
#ifdef KMDB_TRAPCOUNT
.align 8
#endif
#ifdef KMDB_TRAPCOUNT /* Trap counter. See top comment */
#endif
/* NOTREACHED */
#ifdef KMDB_TRAPCOUNT
.align 8
#endif
#endif /* lint */