lib/libkvm/kvm_sparc.c

   1 /*      $NetBSD: kvm_sparc.c,v 1.29 2008/01/15 13:57:42 ad Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software developed by the Computer Systems
   8  * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
   9  * BG 91-66 and contributed to Berkeley.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #if defined(LIBC_SCCS) && !defined(lint)
  38 #if 0
  39 static char sccsid[] = "@(#)kvm_sparc.c 8.1 (Berkeley) 6/4/93";
  40 #else
  41 __RCSID("$NetBSD: kvm_sparc.c,v 1.29 2008/01/15 13:57:42 ad Exp $");
  42 #endif
  43 #endif /* LIBC_SCCS and not lint */
  44
  45 /*
  46  * Sparc machine dependent routines for kvm.  Hopefully, the forthcoming
  47  * vm code will one day obsolete this module.
  48  */
  49
  50 #include <sys/param.h>
  51 #include <sys/exec.h>
  52 #include <sys/user.h>
  53 #include <sys/proc.h>
  54 #include <sys/stat.h>
  55 #include <sys/core.h>
  56 #include <sys/kcore.h>
  57 #include <unistd.h>
  58 #include <nlist.h>
  59 #include <kvm.h>
  60
  61 #include <uvm/uvm_extern.h>
  62
  63 #include <sparc/pmap.h>
  64 #include <sparc/kcore.h>
  65
  66 #include <limits.h>
  67 #include <db.h>
  68
  69 #include "kvm_private.h"
  70
  71
  72 static int cputyp = -1;
  73 static int pgshift;
  74 static int nptesg;      /* [sun4/sun4c] only */
  75
  76 #undef VA_VPG
  77 #define VA_VPG(va)      ((cputyp == CPU_SUN4C || cputyp == CPU_SUN4M) \
  78                                 ? VA_SUN4C_VPG(va) \
  79                                 : VA_SUN4_VPG(va))
  80
  81 #undef VA_OFF
  82 #define VA_OFF(va) (va & (kd->nbpg - 1))
  83
  84 int _kvm_kvatop44c __P((kvm_t *, u_long, u_long *));
  85 int _kvm_kvatop4m __P((kvm_t *, u_long, u_long *));
  86 int _kvm_kvatop4u __P((kvm_t *, u_long, u_long *));
  87
  88 /*
  89  * XXX
  90  * taken from /sys/arch/sparc64/include/kcore.h.
  91  * this is the same as the sparc one, except for the kphys addition,
  92  * so luckily we can use this here...
  93  */
  94 typedef struct sparc64_cpu_kcore_hdr {
  95         int     cputype;                /* CPU type associated with this dump */
  96         u_long  kernbase;               /* copy of KERNBASE goes here */
  97         int     nmemseg;                /* # of physical memory segments */
  98         u_long  memsegoffset;           /* start of memseg array (relative */
  99                                         /*  to the start of this header) */
 100         int     nsegmap;                /* # of segmaps following */
 101         u_long  segmapoffset;           /* start of segmap array (relative */
 102                                         /*  to the start of this header) */
 103         int     npmeg;                  /* # of PMEGs; [sun4/sun4c] only */
 104         u_long  pmegoffset;             /* start of pmeg array (relative */
 105                                         /*  to the start of this header) */
 106 /* SPARC64 stuff */
 107         paddr_t kphys;                  /* Physical address of 4MB locked TLB */
 108 } sparc64_cpu_kcore_hdr_t;
 109
 110 void
 111 _kvm_freevtop(kd)
 112         kvm_t *kd;
 113 {
 114         if (kd->vmst != 0) {
 115                 _kvm_err(kd, kd->program, "_kvm_freevtop: internal error");
 116                 kd->vmst = 0;
 117         }
 118 }
 119
 120 /*
 121  * Prepare for translation of kernel virtual addresses into offsets
 122  * into crash dump files. We use the MMU specific goop written at the
 123  * front of the crash dump by pmap_dumpmmu().
 124  */
 125 int
 126 _kvm_initvtop(kd)
 127         kvm_t *kd;
 128 {
 129         sparc64_cpu_kcore_hdr_t *cpup = kd->cpu_data;
 130
 131         switch (cputyp = cpup->cputype) {
 132         case CPU_SUN4:
 133         case CPU_SUN4U:
 134                 kd->nbpg = 8196;
 135                 pgshift = 13;
 136                 break;
 137         case CPU_SUN4C:
 138         case CPU_SUN4M:
 139                 kd->nbpg = 4096;
 140                 pgshift = 12;
 141                 break;
 142         default:
 143                 _kvm_err(kd, kd->program, "Unsupported CPU type");
 144                 return (-1);
 145         }
 146         nptesg = NBPSG / kd->nbpg;
 147         return (0);
 148 }
 149
 150 /*
 151  * Translate a kernel virtual address to a physical address using the
 152  * mapping information in kd->vm.  Returns the result in pa, and returns
 153  * the number of bytes that are contiguously available from this
 154  * physical address.  This routine is used only for crash dumps.
 155  */
 156 int
 157 _kvm_kvatop(kd, va, pa)
 158         kvm_t *kd;
 159         u_long va;
 160         u_long *pa;
 161 {
 162         if (cputyp == -1)
 163                 if (_kvm_initvtop(kd) != 0)
 164                         return (-1);
 165
 166         switch (cputyp) {
 167         case CPU_SUN4:
 168         case CPU_SUN4C:
 169                 return _kvm_kvatop44c(kd, va, pa);
 170                 break;
 171         case CPU_SUN4M:
 172                 return _kvm_kvatop4m(kd, va, pa);
 173                 break;
 174         case CPU_SUN4U:
 175         default:
 176                 return _kvm_kvatop4u(kd, va, pa);
 177         }
 178 }
 179
 180 /*
 181  * (note: sun4 3-level MMU not yet supported)
 182  */
 183 int
 184 _kvm_kvatop44c(kd, va, pa)
 185         kvm_t *kd;
 186         u_long va;
 187         u_long *pa;
 188 {
 189         int vr, vs, pte;
 190         sparc64_cpu_kcore_hdr_t *cpup = kd->cpu_data;
 191         struct segmap *sp, *segmaps;
 192         int *ptes;
 193         int nkreg, nureg;
 194         u_long kernbase = cpup->kernbase;
 195
 196         if (va < kernbase)
 197                 goto err;
 198
 199         /*
 200          * Layout of CPU segment:
 201          *      cpu_kcore_hdr_t;
 202          *      [alignment]
 203          *      phys_ram_seg_t[cpup->nmemseg];
 204          *      segmap[cpup->nsegmap];
 205          *      ptes[cpup->npmegs];
 206          */
 207         segmaps = (struct segmap *)((long)kd->cpu_data + cpup->segmapoffset);
 208         ptes = (int *)((int)kd->cpu_data + cpup->pmegoffset);
 209         nkreg = ((int)((-(unsigned)kernbase) / NBPRG));
 210         nureg = 256 - nkreg;
 211
 212         vr = VA_VREG(va);
 213         vs = VA_VSEG(va);
 214
 215         sp = &segmaps[(vr-nureg)*NSEGRG + vs];
 216         if (sp->sg_npte == 0)
 217                 goto err;
 218         if (sp->sg_pmeg == cpup->npmeg - 1) /* =seginval */
 219                 goto err;
 220         pte = ptes[sp->sg_pmeg * nptesg + VA_VPG(va)];
 221         if ((pte & PG_V) != 0) {
 222                 long p, off = VA_OFF(va);
 223
 224                 p = (pte & PG_PFNUM) << pgshift;
 225                 *pa = p + off;
 226                 return (kd->nbpg - off);
 227         }
 228 err:
 229         _kvm_err(kd, 0, "invalid address (%lx)", va);
 230         return (0);
 231 }
 232
 233 int
 234 _kvm_kvatop4m(kd, va, pa)
 235         kvm_t *kd;
 236         u_long va;
 237         u_long *pa;
 238 {
 239         sparc64_cpu_kcore_hdr_t *cpup = kd->cpu_data;
 240         int vr, vs;
 241         int pte;
 242         off_t foff;
 243         struct segmap *sp, *segmaps;
 244         int nkreg, nureg;
 245         u_long kernbase = cpup->kernbase;
 246
 247         if (va < kernbase)
 248                 goto err;
 249
 250         /*
 251          * Layout of CPU segment:
 252          *      cpu_kcore_hdr_t;
 253          *      [alignment]
 254          *      phys_ram_seg_t[cpup->nmemseg];
 255          *      segmap[cpup->nsegmap];
 256          */
 257         segmaps = (struct segmap *)((long)kd->cpu_data + cpup->segmapoffset);
 258         nkreg = ((int)((-(unsigned)kernbase) / NBPRG));
 259         nureg = 256 - nkreg;
 260
 261         vr = VA_VREG(va);
 262         vs = VA_VSEG(va);
 263
 264         sp = &segmaps[(vr-nureg)*NSEGRG + vs];
 265         if (sp->sg_npte == 0)
 266                 goto err;
 267
 268         /* XXX - assume page tables in initial kernel DATA or BSS. */
 269         foff = _kvm_pa2off(kd, (u_long)&sp->sg_pte[VA_VPG(va)] - kernbase);
 270         if (foff == (off_t)-1)
 271                 return (0);
 272
 273         if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte), foff) != sizeof(pte)) {
 274                 _kvm_syserr(kd, kd->program, "cannot read pte for %lx", va);
 275                 return (0);
 276         }
 277
 278         if ((pte & SRMMU_TETYPE) == SRMMU_TEPTE) {
 279                 long p, off = VA_OFF(va);
 280
 281                 p = (pte & SRMMU_PPNMASK) << SRMMU_PPNPASHIFT;
 282                 *pa = p + off;
 283                 return (kd->nbpg - off);
 284         }
 285 err:
 286         _kvm_err(kd, 0, "invalid address (%lx)", va);
 287         return (0);
 288 }
 289
 290 /*
 291  * sparc64 pmap's 32-bit page table format
 292  */
 293 int
 294 _kvm_kvatop4u(kd, va, pa)
 295         kvm_t *kd;
 296         u_long va;
 297         u_long *pa;
 298 {
 299         sparc64_cpu_kcore_hdr_t *cpup = kd->cpu_data;
 300         int64_t **segmaps;
 301         int64_t *ptes;
 302         int64_t pte;
 303         int64_t kphys = cpup->kphys;
 304         u_long kernbase = cpup->kernbase;
 305
 306         if (va < kernbase)
 307                 goto err;
 308
 309         /*
 310          * Kernel layout:
 311          *
 312          * kernbase:
 313          *      4MB locked TLB (text+data+BSS)
 314          *      Random other stuff.
 315          */
 316         if (va >= kernbase && va < kernbase + 4*1024*1024)
 317                 return (va - kernbase) + kphys;
 318
 319 /* XXX: from sparc64/include/pmap.h */
 320 #define SPARC64_PTSZ            (kd->nbpg/8)
 321 #define SPARC64_STSZ            (SPARC64_PTSZ)
 322 #define SPARC64_PTMASK          (SPARC64_PTSZ-1)
 323 #define SPARC64_PTSHIFT         (13)
 324 #define SPARC64_PDSHIFT         (10+SPARC64_PTSHIFT)
 325 #define SPARC64_STSHIFT         (10+SPARC64_PDSHIFT)
 326 #define SPARC64_STMASK          (SPARC64_STSZ-1)
 327 #define sparc64_va_to_seg(v)    (int)((((int64_t)(v))>>SPARC64_STSHIFT)&SPARC64_STMASK)
 328 #define sparc64_va_to_pte(v)    (int)((((int64_t)(v))>>SPARC64_PTSHIFT)&SPARC64_PTMASK)
 329
 330 /* XXX: from sparc64/include/pte.h */
 331 #define SPARC64_TLB_V                   0x8000000000000000LL
 332 #define SPARC64_TLB_PA_MASK             0x000001ffffffe000LL
 333
 334         /*
 335          * Layout of CPU segment:
 336          *      cpu_kcore_hdr_t;
 337          *      [alignment]
 338          *      phys_ram_seg_t[cpup->nmemseg];
 339          *      segmap[cpup->nsegmap];
 340          */
 341         segmaps = (int64_t **)((long)kd->cpu_data + cpup->segmapoffset);
 342         /* XXX XXX XXX _kvm_pa2off takes u_long and returns off_t..
 343            should take off_t also!! */
 344
 345         ptes = (int64_t *)(int)_kvm_pa2off(kd, (u_long)segmaps[sparc64_va_to_seg(va)]);
 346         pte = ptes[sparc64_va_to_pte(va)];
 347         if ((pte & SPARC64_TLB_V) != 0)
 348                 return ((pte & SPARC64_TLB_PA_MASK) | (va & (kd->nbpg - 1)));
 349 err:
 350         _kvm_err(kd, 0, "invalid address (%lx)", va);
 351         return (0);
 352 }
 353
 354
 355 /*
 356  * Translate a physical address to a file-offset in the crash dump.
 357  */
 358 off_t
 359 _kvm_pa2off(kd, pa)
 360         kvm_t   *kd;
 361         u_long  pa;
 362 {
 363         sparc64_cpu_kcore_hdr_t *cpup = kd->cpu_data;
 364         phys_ram_seg_t *mp;
 365         off_t off;
 366         int nmem;
 367
 368         /*
 369          * Layout of CPU segment:
 370          *      cpu_kcore_hdr_t;
 371          *      [alignment]
 372          *      phys_ram_seg_t[cpup->nmemseg];
 373          */
 374         mp = (phys_ram_seg_t *)((int)kd->cpu_data + cpup->memsegoffset);
 375         off = 0;
 376
 377         /* Translate (sparse) pfnum to (packed) dump offset */
 378         for (nmem = cpup->nmemseg; --nmem >= 0; mp++) {
 379                 if (mp->start <= pa && pa < mp->start + mp->size)
 380                         break;
 381                 off += mp->size;
 382         }
 383         if (nmem < 0) {
 384                 _kvm_err(kd, 0, "invalid address (%lx)", pa);
 385                 return (-1);
 386         }
 387
 388         return (kd->dump_off + off + pa - mp->start);
 389 }
 390
 391 /*
 392  * Machine-dependent initialization for ALL open kvm descriptors,
 393  * not just those for a kernel crash dump.  Some architectures
 394  * have to deal with these NOT being constants!  (i.e. m68k)
 395  */
 396 int
 397 _kvm_mdopen(kd)
 398         kvm_t   *kd;
 399 {
 400         u_long max_uva;
 401         extern struct ps_strings *__ps_strings;
 402
 403         max_uva = (u_long) (__ps_strings + 1);
 404         kd->usrstack = max_uva;
 405         kd->max_uva  = max_uva;
 406         kd->min_uva  = 0;
 407
 408         return (0);
 409 }