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/* $OpenBSD: kvm_sparc.c,v 1.12 2009/10/27 23:59:28 deraadt Exp $ */
/* $NetBSD: kvm_sparc.c,v 1.9 1996/04/01 19:23:03 cgd Exp $ */
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software developed by the Computer Systems
* Engineering group at Lawrence Berkeley Laboratory under DARPA contract
* BG 91-66 and contributed to Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Sparc machine dependent routines for kvm. Hopefully, the forthcoming
* vm code will one day obsolete this module.
*/
#include <sys/param.h>
#include <sys/user.h>
#include <sys/proc.h>
#include <sys/stat.h>
#include <sys/core.h>
#include <sys/kcore.h>
#include <unistd.h>
#include <nlist.h>
#include <kvm.h>
#include <uvm/uvm_extern.h>
#include <machine/vmparam.h>
#include <machine/pmap.h>
#include <machine/autoconf.h>
#include <machine/kcore.h>
#include <limits.h>
#include <db.h>
#include "kvm_private.h"
static int cputyp = -1;
static int pgshift;
static int nptesg; /* [sun4/sun4c] only */
#define VA_VPG(va) ((cputyp == CPU_SUN4C || cputyp == CPU_SUN4M) \
? VA_SUN4C_VPG(va) \
: VA_SUN4_VPG(va))
#define VA_OFF(va) (va & (kd->nbpg - 1))
void
_kvm_freevtop(kvm_t *kd)
{
if (kd->vmst != NULL) {
_kvm_err(kd, kd->program, "_kvm_freevtop: internal error");
kd->vmst = NULL;
}
}
/*
* Prepare for translation of kernel virtual addresses into offsets
* into crash dump files. We use the MMU specific goop written at the
* front of the crash dump by pmap_dumpmmu().
*/
int
_kvm_initvtop(kvm_t *kd)
{
cpu_kcore_hdr_t *cpup = kd->cpu_data;
switch (cputyp = cpup->cputype) {
case CPU_SUN4:
kd->nbpg = 8196;
pgshift = 13;
break;
case CPU_SUN4C:
case CPU_SUN4M:
kd->nbpg = 4096;
pgshift = 12;
break;
default:
_kvm_err(kd, kd->program, "Unsupported CPU type");
return (-1);
}
nptesg = NBPSG / kd->nbpg;
return (0);
}
/*
* Translate a kernel virtual address to a physical address using the
* mapping information in kd->vm. Returns the result in pa, and returns
* the number of bytes that are contiguously available from this
* physical address. This routine is used only for crashdumps.
*/
int
_kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa)
{
if (cputyp == -1)
if (_kvm_initvtop(kd) != 0)
return (-1);
return ((cputyp == CPU_SUN4M) ? _kvm_kvatop4m(kd, va, pa) :
_kvm_kvatop44c(kd, va, pa));
}
/*
* (note: sun4 3-level MMU not yet supported)
*/
int
_kvm_kvatop44c(kvm_t *kd, u_long va, u_long *pa)
{
cpu_kcore_hdr_t *cpup = kd->cpu_data;
int vr, vs, pte, *ptes;
struct regmap *rp;
struct segmap *sp;
if (va < KERNBASE)
goto err;
/*
* Layout of CPU segment:
* cpu_kcore_hdr_t;
* [alignment]
* phys_ram_seg_t[cpup->nmemseg];
* ptes[cpup->npmegs];
*/
ptes = (int *)((int)kd->cpu_data + cpup->pmegoffset);
vr = VA_VREG(va);
vs = VA_VSEG(va);
sp = &cpup->segmap_store[(vr-NUREG)*NSEGRG + vs];
if (sp->sg_npte == 0)
goto err;
if (sp->sg_pmeg == cpup->npmeg - 1) /* =seginval */
goto err;
pte = ptes[sp->sg_pmeg * nptesg + VA_VPG(va)];
if ((pte & PG_V) != 0) {
long p, off = VA_OFF(va);
p = (pte & PG_PFNUM) << pgshift;
*pa = p + off;
return (kd->nbpg - off);
}
err:
_kvm_err(kd, 0, "invalid address (%x)", va);
return (0);
}
int
_kvm_kvatop4m(kvm_t *kd, u_long va, u_long *pa)
{
cpu_kcore_hdr_t *cpup = kd->cpu_data;
struct regmap *rp;
struct segmap *sp;
int vr, vs, pte;
off_t foff;
if (va < KERNBASE)
goto err;
/*
* Layout of CPU segment:
* cpu_kcore_hdr_t;
* [alignment]
* phys_ram_seg_t[cpup->nmemseg];
*/
vr = VA_VREG(va);
vs = VA_VSEG(va);
sp = &cpup->segmap_store[(vr-NUREG)*NSEGRG + vs];
if (sp->sg_npte == 0)
goto err;
/* XXX - assume page tables in initial kernel DATA or BSS. */
foff = _kvm_pa2off(kd, (u_long)&sp->sg_pte[VA_VPG(va)] - KERNBASE);
if (foff == (off_t)-1)
return (0);
if (_kvm_pread(kd, kd->pmfd, (void *)&pte, sizeof(pte), foff) < 0) {
_kvm_err(kd, kd->program, "cannot read pte for %x", va);
return (0);
}
if ((pte & SRMMU_TETYPE) == SRMMU_TEPTE) {
long p, off = VA_OFF(va);
p = (pte & SRMMU_PPNMASK) << SRMMU_PPNPASHIFT;
*pa = p + off;
return (kd->nbpg - off);
}
err:
_kvm_err(kd, 0, "invalid address (%x)", va);
return (0);
}
/*
* Translate a physical address to a file-offset in the crash-dump.
*/
off_t
_kvm_pa2off(kvm_t *kd, paddr_t pa)
{
cpu_kcore_hdr_t *cpup = kd->cpu_data;
phys_ram_seg_t *mp;
off_t off;
int nmem;
/*
* Layout of CPU segment:
* cpu_kcore_hdr_t;
* [alignment]
* phys_ram_seg_t[cpup->nmemseg];
*/
mp = (phys_ram_seg_t *)((int)kd->cpu_data + cpup->memsegoffset);
off = 0;
/* Translate (sparse) pfnum to (packed) dump offset */
for (nmem = cpup->nmemseg; --nmem >= 0; mp++) {
if (mp->start <= pa && pa < mp->start + mp->size)
break;
off += mp->size;
}
if (nmem < 0) {
_kvm_err(kd, 0, "invalid address (%x)", pa);
return (-1);
}
return (kd->dump_off + off + pa - mp->start);
}
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