391 lines
10 KiB
C
391 lines
10 KiB
C
/* $NetBSD: kvm_sparc.c,v 1.35 2015/10/31 02:40:44 nakayama Exp $ */
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/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software developed by the Computer Systems
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* Engineering group at Lawrence Berkeley Laboratory under DARPA contract
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* BG 91-66 and contributed to Berkeley.
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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. 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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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)kvm_sparc.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: kvm_sparc.c,v 1.35 2015/10/31 02:40:44 nakayama Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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/*
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* Sparc machine dependent routines for kvm. Hopefully, the forthcoming
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* vm code will one day obsolete this module.
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*/
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#include <sys/param.h>
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#include <sys/exec.h>
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#include <sys/proc.h>
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#include <sys/stat.h>
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#include <sys/core.h>
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#include <sys/kcore.h>
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#include <unistd.h>
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#include <nlist.h>
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#include <kvm.h>
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#include <uvm/uvm_extern.h>
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#include <sparc/pmap.h>
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#include <sparc/kcore.h>
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#include <limits.h>
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#include <db.h>
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#include "kvm_private.h"
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static int cputyp = -1;
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static int pgshift;
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static int nptesg; /* [sun4/sun4c] only */
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#undef VA_VPG
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#define VA_VPG(va) ((cputyp == CPU_SUN4C || cputyp == CPU_SUN4M) \
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? VA_SUN4C_VPG(va) \
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: VA_SUN4_VPG(va))
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#undef VA_OFF
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#define VA_OFF(va) (va & (kd->nbpg - 1))
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int _kvm_kvatop44c(kvm_t *, vaddr_t, paddr_t *);
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int _kvm_kvatop4m (kvm_t *, vaddr_t, paddr_t *);
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int _kvm_kvatop4u (kvm_t *, vaddr_t, paddr_t *);
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/*
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* XXX
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* taken from /sys/arch/sparc64/include/kcore.h.
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* this is the same as the sparc one, except for the kphys addition,
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* so luckily we can use this here...
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*/
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typedef struct sparc64_cpu_kcore_hdr {
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int cputype; /* CPU type associated with this dump */
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u_long kernbase; /* copy of KERNBASE goes here */
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int nmemseg; /* # of physical memory segments */
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u_long memsegoffset; /* start of memseg array (relative */
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/* to the start of this header) */
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int nsegmap; /* # of segmaps following */
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u_long segmapoffset; /* start of segmap array (relative */
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/* to the start of this header) */
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int npmeg; /* # of PMEGs; [sun4/sun4c] only */
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u_long pmegoffset; /* start of pmeg array (relative */
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/* to the start of this header) */
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/* SPARC64 stuff */
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paddr_t kphys; /* Physical address of 4MB locked TLB */
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} sparc64_cpu_kcore_hdr_t;
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void
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_kvm_freevtop(kvm_t *kd)
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{
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if (kd->vmst != 0) {
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_kvm_err(kd, kd->program, "_kvm_freevtop: internal error");
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kd->vmst = 0;
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}
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}
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/*
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* Prepare for translation of kernel virtual addresses into offsets
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* into crash dump files. We use the MMU specific goop written at the
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* front of the crash dump by pmap_dumpmmu().
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*/
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int
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_kvm_initvtop(kvm_t *kd)
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{
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sparc64_cpu_kcore_hdr_t *cpup = kd->cpu_data;
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switch (cputyp = cpup->cputype) {
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case CPU_SUN4:
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case CPU_SUN4U:
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kd->nbpg = 8196;
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pgshift = 13;
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break;
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case CPU_SUN4C:
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case CPU_SUN4M:
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kd->nbpg = 4096;
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pgshift = 12;
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break;
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default:
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_kvm_err(kd, kd->program, "Unsupported CPU type");
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return (-1);
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}
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nptesg = NBPSG / kd->nbpg;
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return (0);
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}
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/*
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* Translate a kernel virtual address to a physical address using the
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* mapping information in kd->vm. Returns the result in pa, and returns
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* the number of bytes that are contiguously available from this
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* physical address. This routine is used only for crash dumps.
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*/
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int
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_kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa)
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{
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if (cputyp == -1)
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if (_kvm_initvtop(kd) != 0)
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return (-1);
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switch (cputyp) {
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case CPU_SUN4:
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case CPU_SUN4C:
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return _kvm_kvatop44c(kd, va, pa);
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break;
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case CPU_SUN4M:
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return _kvm_kvatop4m(kd, va, pa);
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break;
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case CPU_SUN4U:
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default:
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return _kvm_kvatop4u(kd, va, pa);
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}
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}
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/*
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* (note: sun4 3-level MMU not yet supported)
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*/
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int
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_kvm_kvatop44c(kvm_t *kd, vaddr_t va, paddr_t *pa)
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{
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int vr, vs, pte;
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sparc64_cpu_kcore_hdr_t *cpup = kd->cpu_data;
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struct segmap *sp, *segmaps;
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int *ptes;
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int nkreg, nureg;
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u_long kernbase = cpup->kernbase;
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if (va < kernbase)
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goto err;
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/*
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* Layout of CPU segment:
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* cpu_kcore_hdr_t;
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* [alignment]
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* phys_ram_seg_t[cpup->nmemseg];
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* segmap[cpup->nsegmap];
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* ptes[cpup->npmegs];
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*/
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segmaps = (struct segmap *)((long)kd->cpu_data + cpup->segmapoffset);
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ptes = (int *)((int)kd->cpu_data + cpup->pmegoffset);
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nkreg = ((int)((-(unsigned)kernbase) / NBPRG));
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nureg = 256 - nkreg;
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vr = VA_VREG(va);
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vs = VA_VSEG(va);
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sp = &segmaps[(vr-nureg)*NSEGRG + vs];
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if (sp->sg_npte == 0)
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goto err;
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if (sp->sg_pmeg == cpup->npmeg - 1) /* =seginval */
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goto err;
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pte = ptes[sp->sg_pmeg * nptesg + VA_VPG(va)];
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if ((pte & PG_V) != 0) {
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paddr_t p, off = VA_OFF(va);
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p = (pte & PG_PFNUM) << pgshift;
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*pa = p + off;
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return (kd->nbpg - off);
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}
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err:
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_kvm_err(kd, 0, "invalid address (%#"PRIxVADDR")", va);
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return (0);
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}
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int
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_kvm_kvatop4m(kvm_t *kd, vaddr_t va, paddr_t *pa)
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{
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sparc64_cpu_kcore_hdr_t *cpup = kd->cpu_data;
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int vr, vs;
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int pte;
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off_t foff;
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struct segmap *sp, *segmaps;
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int nkreg, nureg;
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u_long kernbase = cpup->kernbase;
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if (va < kernbase)
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goto err;
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/*
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* Layout of CPU segment:
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* cpu_kcore_hdr_t;
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* [alignment]
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* phys_ram_seg_t[cpup->nmemseg];
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* segmap[cpup->nsegmap];
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*/
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segmaps = (struct segmap *)((long)kd->cpu_data + cpup->segmapoffset);
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nkreg = ((int)((-(unsigned)kernbase) / NBPRG));
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nureg = 256 - nkreg;
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vr = VA_VREG(va);
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vs = VA_VSEG(va);
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sp = &segmaps[(vr-nureg)*NSEGRG + vs];
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if (sp->sg_npte == 0)
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goto err;
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/* XXX - assume page tables in initial kernel DATA or BSS. */
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foff = _kvm_pa2off(kd, (u_long)&sp->sg_pte[VA_VPG(va)] - kernbase);
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if (foff == (off_t)-1)
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return (0);
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if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte), foff) != sizeof(pte)) {
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_kvm_syserr(kd, kd->program, "cannot read pte for "
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"%#" PRIxVADDR, va);
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return (0);
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}
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if ((pte & SRMMU_TETYPE) == SRMMU_TEPTE) {
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long p, off = VA_OFF(va);
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p = (pte & SRMMU_PPNMASK) << SRMMU_PPNPASHIFT;
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*pa = p + off;
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return (kd->nbpg - off);
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}
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err:
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_kvm_err(kd, 0, "invalid address (%#"PRIxVADDR")", va);
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return (0);
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}
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/*
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* sparc64 pmap's 32-bit page table format
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*/
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int
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_kvm_kvatop4u(kvm_t *kd, vaddr_t va, paddr_t *pa)
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{
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sparc64_cpu_kcore_hdr_t *cpup = kd->cpu_data;
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int64_t **segmaps;
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int64_t *ptes;
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int64_t pte;
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int64_t kphys = cpup->kphys;
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u_long kernbase = cpup->kernbase;
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if (va < kernbase)
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goto err;
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/*
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* Kernel layout:
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*
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* kernbase:
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* 4MB locked TLB (text+data+BSS)
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* Random other stuff.
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*/
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if (va >= kernbase && va < kernbase + 4*1024*1024)
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return (va - kernbase) + kphys;
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/* XXX: from sparc64/include/pmap.h */
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#define SPARC64_PTSZ (kd->nbpg/8)
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#define SPARC64_STSZ (SPARC64_PTSZ)
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#define SPARC64_PTMASK (SPARC64_PTSZ-1)
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#define SPARC64_PTSHIFT (13)
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#define SPARC64_PDSHIFT (10+SPARC64_PTSHIFT)
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#define SPARC64_STSHIFT (10+SPARC64_PDSHIFT)
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#define SPARC64_STMASK (SPARC64_STSZ-1)
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#define sparc64_va_to_seg(v) (int)((((int64_t)(v))>>SPARC64_STSHIFT)&SPARC64_STMASK)
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#define sparc64_va_to_pte(v) (int)((((int64_t)(v))>>SPARC64_PTSHIFT)&SPARC64_PTMASK)
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/* XXX: from sparc64/include/pte.h */
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#define SPARC64_TLB_V 0x8000000000000000LL
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#define SPARC64_TLB_PA_MASK 0x000001ffffffe000LL
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/*
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* Layout of CPU segment:
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* cpu_kcore_hdr_t;
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* [alignment]
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* phys_ram_seg_t[cpup->nmemseg];
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* segmap[cpup->nsegmap];
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*/
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segmaps = (int64_t **)((long)kd->cpu_data + cpup->segmapoffset);
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ptes = (int64_t *)(intptr_t)_kvm_pa2off(kd,
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(paddr_t)(intptr_t)segmaps[sparc64_va_to_seg(va)]);
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pte = ptes[sparc64_va_to_pte(va)];
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if ((pte & SPARC64_TLB_V) != 0)
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return ((pte & SPARC64_TLB_PA_MASK) | (va & (kd->nbpg - 1)));
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err:
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_kvm_err(kd, 0, "invalid address (%#"PRIxVADDR")", va);
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return (0);
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}
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/*
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* Translate a physical address to a file-offset in the crash dump.
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*/
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off_t
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_kvm_pa2off(kvm_t *kd, paddr_t pa)
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{
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sparc64_cpu_kcore_hdr_t *cpup = kd->cpu_data;
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phys_ram_seg_t *mp;
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off_t off;
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int nmem;
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/*
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* Layout of CPU segment:
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* cpu_kcore_hdr_t;
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* [alignment]
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* phys_ram_seg_t[cpup->nmemseg];
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*/
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mp = (phys_ram_seg_t *)((int)kd->cpu_data + cpup->memsegoffset);
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off = 0;
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/* Translate (sparse) pfnum to (packed) dump offset */
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for (nmem = cpup->nmemseg; --nmem >= 0; mp++) {
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if (mp->start <= pa && pa < mp->start + mp->size)
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break;
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off += mp->size;
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}
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if (nmem < 0) {
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_kvm_err(kd, 0, "invalid address (%#"PRIxPADDR")", pa);
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return (-1);
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}
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return (kd->dump_off + off + pa - mp->start);
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}
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/*
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* Machine-dependent initialization for ALL open kvm descriptors,
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* not just those for a kernel crash dump. Some architectures
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* have to deal with these NOT being constants! (i.e. m68k)
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*/
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int
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_kvm_mdopen(kvm_t *kd)
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{
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u_long max_uva;
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extern struct ps_strings *__ps_strings;
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max_uva = (u_long) (__ps_strings + 1);
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kd->usrstack = max_uva;
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kd->max_uva = max_uva;
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kd->min_uva = 0;
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return (0);
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}
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