lib/libkvm/kvm_sun3x.c

   1 /*      $NetBSD: kvm_sun3x.c,v 1.12 2011/09/14 12:37:55 christos Exp $  */
   2
   3 /*-
   4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Gordon W. Ross.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char sccsid[] = "@(#)kvm_sparc.c 8.1 (Berkeley) 6/4/93";
  36 #else
  37 __RCSID("$NetBSD: kvm_sun3x.c,v 1.12 2011/09/14 12:37:55 christos Exp $");
  38 #endif
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 /*
  42  * Sun3x machine dependent routines for kvm.
  43  *
  44  * Note: This file has to build on ALL m68k machines,
  45  * so do NOT include any <machine / *.h> files here.
  46  */
  47 #include <sys/param.h>
  48 #include <sys/types.h>
  49 #include <sys/kcore.h>
  50
  51 #include <unistd.h>
  52 #include <limits.h>
  53 #include <nlist.h>
  54 #include <kvm.h>
  55 #include <db.h>
  56
  57 #include <m68k/kcore.h>
  58
  59 #include "kvm_private.h"
  60 #include "kvm_m68k.h"
  61
  62 int   _kvm_sun3x_initvtop(kvm_t *);
  63 void  _kvm_sun3x_freevtop(kvm_t *);
  64 int   _kvm_sun3x_kvatop  (kvm_t *, vaddr_t, paddr_t *);
  65 off_t _kvm_sun3x_pa2off  (kvm_t *, paddr_t);
  66
  67 struct kvm_ops _kvm_ops_sun3x = {
  68         _kvm_sun3x_initvtop,
  69         _kvm_sun3x_freevtop,
  70         _kvm_sun3x_kvatop,
  71         _kvm_sun3x_pa2off };
  72
  73 #define _kvm_kvas_size(h)       \
  74         (-((h)->kernbase))
  75 #define _kvm_nkptes(h, v)       \
  76         (_kvm_kvas_size((h)) >> (v)->pgshift)
  77 #define _kvm_pg_pa(pte, h)      \
  78         ((pte) & (h)->pg_frame)
  79
  80 /*
  81  * Prepare for translation of kernel virtual addresses into offsets
  82  * into crash dump files.  Nothing to do here.
  83  */
  84 int
  85 _kvm_sun3x_initvtop(kvm_t *kd)
  86 {
  87         return 0;
  88 }
  89
  90 void
  91 _kvm_sun3x_freevtop(kvm_t *kd)
  92 {
  93 }
  94
  95 /*
  96  * Translate a kernel virtual address to a physical address using the
  97  * mapping information in kd->vm.  Returns the result in pa, and returns
  98  * the number of bytes that are contiguously available from this
  99  * physical address.  This routine is used only for crash dumps.
 100  */
 101 int
 102 _kvm_sun3x_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pap)
 103 {
 104         cpu_kcore_hdr_t *h = kd->cpu_data;
 105         struct sun3x_kcore_hdr *s = &h->un._sun3x;
 106         struct vmstate *v = kd->vmst;
 107         int idx, len, offset, pte;
 108         u_long pteva, pa;
 109
 110         if (ISALIVE(kd)) {
 111                 _kvm_err(kd, 0, "vatop called in live kernel!");
 112                 return(0);
 113         }
 114
 115         if (va < h->kernbase) {
 116                 _kvm_err(kd, 0, "not a kernel address");
 117                 return(0);
 118         }
 119
 120         /*
 121          * If this VA is in the contiguous range, short-cut.
 122          * Note that this ends our recursion when we call
 123          * kvm_read to access the kernel page table, which
 124          * is guaranteed to be in the contiguous range.
 125          */
 126         if (va < s->contig_end) {
 127                 len = s->contig_end - va;
 128                 pa = va - h->kernbase;
 129                 goto done;
 130         }
 131
 132         /*
 133          * The KVA is beyond the contiguous range, so we must
 134          * read the PTE for this KVA from the page table.
 135          */
 136         idx = ((va - h->kernbase) >> v->pgshift);
 137         pteva = s->kernCbase + (idx * 4);
 138         if (kvm_read(kd, pteva, &pte, 4) != 4) {
 139                 _kvm_err(kd, 0, "can not read PTE!");
 140                 return (0);
 141         }
 142         if ((pte & s->pg_valid) == 0) {
 143                 _kvm_err(kd, 0, "page not valid (VA=0x%lx)", va);
 144                 return (0);
 145         }
 146         offset = va & v->pgofset;
 147         len = (h->page_size - offset);
 148         pa = _kvm_pg_pa(pte, s) + offset;
 149
 150 done:
 151         *pap = pa;
 152         return (len);
 153 }
 154
 155 /*
 156  * Translate a physical address to a file-offset in the crash dump.
 157  */
 158 off_t
 159 _kvm_sun3x_pa2off(kvm_t *kd, paddr_t pa)
 160 {
 161         off_t           off;
 162         phys_ram_seg_t  *rsp;
 163         cpu_kcore_hdr_t *h = kd->cpu_data;
 164         struct sun3x_kcore_hdr *s = &h->un._sun3x;
 165
 166         off = 0;
 167         for (rsp = s->ram_segs; rsp->size; rsp++) {
 168                 if (pa >= rsp->start && pa < rsp->start + rsp->size) {
 169                         pa -= rsp->start;
 170                         break;
 171                 }
 172                 off += rsp->size;
 173         }
 174         return (kd->dump_off + off + pa);
 175 }
 176