lib/libkvm/kvm_sparc.c

   1 /*      $NetBSD: kvm_sparc.c,v 1.34 2015/10/07 11:56:41 martin 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 1.34 2015/10/07 11:56:41 martin 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/proc.h>
  53 #include <sys/stat.h>
  54 #include <sys/core.h>
  55 #include <sys/kcore.h>
  56 #include <unistd.h>
  57 #include <nlist.h>
  58 #include <kvm.h>
  59
  60 #include <uvm/uvm_extern.h>
  61
  62 #include <sparc/pmap.h>
  63 #include <sparc/kcore.h>
  64
  65 #include <limits.h>
  66 #include <db.h>
  67
  68 #include "kvm_private.h"
  69
  70
  71 static int cputyp = -1;
  72 static int pgshift;
  73 static int nptesg;      /* [sun4/sun4c] only */
  74
  75 #undef VA_VPG
  76 #define VA_VPG(va)      ((cputyp == CPU_SUN4C || cputyp == CPU_SUN4M) \
  77                                 ? VA_SUN4C_VPG(va) \
  78                                 : VA_SUN4_VPG(va))
  79
  80 #undef VA_OFF
  81 #define VA_OFF(va) (va & (kd->nbpg - 1))
  82
  83 int _kvm_kvatop44c(kvm_t *, vaddr_t, paddr_t *);
  84 int _kvm_kvatop4m (kvm_t *, vaddr_t, paddr_t *);
  85 int _kvm_kvatop4u (kvm_t *, vaddr_t, paddr_t *);
  86
  87 /*
  88  * XXX
  89  * taken from /sys/arch/sparc64/include/kcore.h.
  90  * this is the same as the sparc one, except for the kphys addition,
  91  * so luckily we can use this here...
  92  */
  93 typedef struct sparc64_cpu_kcore_hdr {
  94         int     cputype;                /* CPU type associated with this dump */
  95         u_long  kernbase;               /* copy of KERNBASE goes here */
  96         int     nmemseg;                /* # of physical memory segments */
  97         u_long  memsegoffset;           /* start of memseg array (relative */
  98                                         /*  to the start of this header) */
  99         int     nsegmap;                /* # of segmaps following */
 100         u_long  segmapoffset;           /* start of segmap array (relative */
 101                                         /*  to the start of this header) */
 102         int     npmeg;                  /* # of PMEGs; [sun4/sun4c] only */
 103         u_long  pmegoffset;             /* start of pmeg array (relative */
 104                                         /*  to the start of this header) */
 105 /* SPARC64 stuff */
 106         paddr_t kphys;                  /* Physical address of 4MB locked TLB */
 107 } sparc64_cpu_kcore_hdr_t;
 108
 109 void
 110 _kvm_freevtop(kvm_t *kd)
 111 {
 112         if (kd->vmst != 0) {
 113                 _kvm_err(kd, kd->program, "_kvm_freevtop: internal error");
 114                 kd->vmst = 0;
 115         }
 116 }
 117
 118 /*
 119  * Prepare for translation of kernel virtual addresses into offsets
 120  * into crash dump files. We use the MMU specific goop written at the
 121  * front of the crash dump by pmap_dumpmmu().
 122  */
 123 int
 124 _kvm_initvtop(kvm_t *kd)
 125 {
 126         sparc64_cpu_kcore_hdr_t *cpup = kd->cpu_data;
 127
 128         switch (cputyp = cpup->cputype) {
 129         case CPU_SUN4:
 130         case CPU_SUN4U:
 131                 kd->nbpg = 8196;
 132                 pgshift = 13;
 133                 break;
 134         case CPU_SUN4C:
 135         case CPU_SUN4M:
 136                 kd->nbpg = 4096;
 137                 pgshift = 12;
 138                 break;
 139         default:
 140                 _kvm_err(kd, kd->program, "Unsupported CPU type");
 141                 return (-1);
 142         }
 143         nptesg = NBPSG / kd->nbpg;
 144         return (0);
 145 }
 146
 147 /*
 148  * Translate a kernel virtual address to a physical address using the
 149  * mapping information in kd->vm.  Returns the result in pa, and returns
 150  * the number of bytes that are contiguously available from this
 151  * physical address.  This routine is used only for crash dumps.
 152  */
 153 int
 154 _kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa)
 155 {
 156         if (cputyp == -1)
 157                 if (_kvm_initvtop(kd) != 0)
 158                         return (-1);
 159
 160         switch (cputyp) {
 161         case CPU_SUN4:
 162         case CPU_SUN4C:
 163                 return _kvm_kvatop44c(kd, va, pa);
 164                 break;
 165         case CPU_SUN4M:
 166                 return _kvm_kvatop4m(kd, va, pa);
 167                 break;
 168         case CPU_SUN4U:
 169         default:
 170                 return _kvm_kvatop4u(kd, va, pa);
 171         }
 172 }
 173
 174 /*
 175  * (note: sun4 3-level MMU not yet supported)
 176  */
 177 int
 178 _kvm_kvatop44c(kvm_t *kd, vaddr_t va, paddr_t *pa)
 179 {
 180         int vr, vs, pte;
 181         sparc64_cpu_kcore_hdr_t *cpup = kd->cpu_data;
 182         struct segmap *sp, *segmaps;
 183         int *ptes;
 184         int nkreg, nureg;
 185         u_long kernbase = cpup->kernbase;
 186
 187         if (va < kernbase)
 188                 goto err;
 189
 190         /*
 191          * Layout of CPU segment:
 192          *      cpu_kcore_hdr_t;
 193          *      [alignment]
 194          *      phys_ram_seg_t[cpup->nmemseg];
 195          *      segmap[cpup->nsegmap];
 196          *      ptes[cpup->npmegs];
 197          */
 198         segmaps = (struct segmap *)((long)kd->cpu_data + cpup->segmapoffset);
 199         ptes = (int *)((int)kd->cpu_data + cpup->pmegoffset);
 200         nkreg = ((int)((-(unsigned)kernbase) / NBPRG));
 201         nureg = 256 - nkreg;
 202
 203         vr = VA_VREG(va);
 204         vs = VA_VSEG(va);
 205
 206         sp = &segmaps[(vr-nureg)*NSEGRG + vs];
 207         if (sp->sg_npte == 0)
 208                 goto err;
 209         if (sp->sg_pmeg == cpup->npmeg - 1) /* =seginval */
 210                 goto err;
 211         pte = ptes[sp->sg_pmeg * nptesg + VA_VPG(va)];
 212         if ((pte & PG_V) != 0) {
 213                 paddr_t p, off = VA_OFF(va);
 214
 215                 p = (pte & PG_PFNUM) << pgshift;
 216                 *pa = p + off;
 217                 return (kd->nbpg - off);
 218         }
 219 err:
 220         _kvm_err(kd, 0, "invalid address (%#"PRIxVADDR")", va);
 221         return (0);
 222 }
 223
 224 int
 225 _kvm_kvatop4m(kvm_t *kd, vaddr_t va, paddr_t *pa)
 226 {
 227         sparc64_cpu_kcore_hdr_t *cpup = kd->cpu_data;
 228         int vr, vs;
 229         int pte;
 230         off_t foff;
 231         struct segmap *sp, *segmaps;
 232         int nkreg, nureg;
 233         u_long kernbase = cpup->kernbase;
 234
 235         if (va < kernbase)
 236                 goto err;
 237
 238         /*
 239          * Layout of CPU segment:
 240          *      cpu_kcore_hdr_t;
 241          *      [alignment]
 242          *      phys_ram_seg_t[cpup->nmemseg];
 243          *      segmap[cpup->nsegmap];
 244          */
 245         segmaps = (struct segmap *)((long)kd->cpu_data + cpup->segmapoffset);
 246         nkreg = ((int)((-(unsigned)kernbase) / NBPRG));
 247         nureg = 256 - nkreg;
 248
 249         vr = VA_VREG(va);
 250         vs = VA_VSEG(va);
 251
 252         sp = &segmaps[(vr-nureg)*NSEGRG + vs];
 253         if (sp->sg_npte == 0)
 254                 goto err;
 255
 256         /* XXX - assume page tables in initial kernel DATA or BSS. */
 257         foff = _kvm_pa2off(kd, (u_long)&sp->sg_pte[VA_VPG(va)] - kernbase);
 258         if (foff == (off_t)-1)
 259                 return (0);
 260
 261         if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte), foff) != sizeof(pte)) {
 262                 _kvm_syserr(kd, kd->program, "cannot read pte for "
 263                     "%#" PRIxVADDR, va);
 264                 return (0);
 265         }
 266
 267         if ((pte & SRMMU_TETYPE) == SRMMU_TEPTE) {
 268                 long p, off = VA_OFF(va);
 269
 270                 p = (pte & SRMMU_PPNMASK) << SRMMU_PPNPASHIFT;
 271                 *pa = p + off;
 272                 return (kd->nbpg - off);
 273         }
 274 err:
 275         _kvm_err(kd, 0, "invalid address (%#"PRIxVADDR")", va);
 276         return (0);
 277 }
 278
 279 /*
 280  * sparc64 pmap's 32-bit page table format
 281  */
 282 int
 283 _kvm_kvatop4u(kvm_t *kd, vaddr_t va, paddr_t *pa)
 284 {
 285         sparc64_cpu_kcore_hdr_t *cpup = kd->cpu_data;
 286         int64_t **segmaps;
 287         int64_t *ptes;
 288         int64_t pte;
 289         int64_t kphys = cpup->kphys;
 290         u_long kernbase = cpup->kernbase;
 291
 292         if (va < kernbase)
 293                 goto err;
 294
 295         /*
 296          * Kernel layout:
 297          *
 298          * kernbase:
 299          *      4MB locked TLB (text+data+BSS)
 300          *      Random other stuff.
 301          */
 302         if (va >= kernbase && va < kernbase + 4*1024*1024)
 303                 return (va - kernbase) + kphys;
 304
 305 /* XXX: from sparc64/include/pmap.h */
 306 #define SPARC64_PTSZ            (kd->nbpg/8)
 307 #define SPARC64_STSZ            (SPARC64_PTSZ)
 308 #define SPARC64_PTMASK          (SPARC64_PTSZ-1)
 309 #define SPARC64_PTSHIFT         (13)
 310 #define SPARC64_PDSHIFT         (10+SPARC64_PTSHIFT)
 311 #define SPARC64_STSHIFT         (10+SPARC64_PDSHIFT)
 312 #define SPARC64_STMASK          (SPARC64_STSZ-1)
 313 #define sparc64_va_to_seg(v)    (int)((((int64_t)(v))>>SPARC64_STSHIFT)&SPARC64_STMASK)
 314 #define sparc64_va_to_pte(v)    (int)((((int64_t)(v))>>SPARC64_PTSHIFT)&SPARC64_PTMASK)
 315
 316 /* XXX: from sparc64/include/pte.h */
 317 #define SPARC64_TLB_V                   0x8000000000000000LL
 318 #define SPARC64_TLB_PA_MASK             0x000001ffffffe000LL
 319
 320         /*
 321          * Layout of CPU segment:
 322          *      cpu_kcore_hdr_t;
 323          *      [alignment]
 324          *      phys_ram_seg_t[cpup->nmemseg];
 325          *      segmap[cpup->nsegmap];
 326          */
 327         segmaps = (int64_t **)((long)kd->cpu_data + cpup->segmapoffset);
 328         ptes = (int64_t *)(intptr_t)_kvm_pa2off(kd,
 329             (paddr_t)(intptr_t)segmaps[sparc64_va_to_seg(va)]);
 330         pte = ptes[sparc64_va_to_pte(va)];
 331         if ((pte & SPARC64_TLB_V) != 0)
 332                 return ((pte & SPARC64_TLB_PA_MASK) | (va & (kd->nbpg - 1)));
 333 err:
 334         _kvm_err(kd, 0, "invalid address (%#"PRIxVADDR")", va);
 335         return (0);
 336 }
 337
 338
 339 /*
 340  * Translate a physical address to a file-offset in the crash dump.
 341  */
 342 off_t
 343 _kvm_pa2off(kvm_t *kd, paddr_t pa)
 344 {
 345         sparc64_cpu_kcore_hdr_t *cpup = kd->cpu_data;
 346         phys_ram_seg_t *mp;
 347         off_t off;
 348         int nmem;
 349
 350         /*
 351          * Layout of CPU segment:
 352          *      cpu_kcore_hdr_t;
 353          *      [alignment]
 354          *      phys_ram_seg_t[cpup->nmemseg];
 355          */
 356         mp = (phys_ram_seg_t *)((int)kd->cpu_data + cpup->memsegoffset);
 357         off = 0;
 358
 359         /* Translate (sparse) pfnum to (packed) dump offset */
 360         for (nmem = cpup->nmemseg; --nmem >= 0; mp++) {
 361                 if (mp->start <= pa && pa < mp->start + mp->size)
 362                         break;
 363                 off += mp->size;
 364         }
 365         if (nmem < 0) {
 366                 _kvm_err(kd, 0, "invalid address (%lx)", (unsigned long)pa);
 367                 return (-1);
 368         }
 369
 370         return (kd->dump_off + off + pa - mp->start);
 371 }
 372
 373 /*
 374  * Machine-dependent initialization for ALL open kvm descriptors,
 375  * not just those for a kernel crash dump.  Some architectures
 376  * have to deal with these NOT being constants!  (i.e. m68k)
 377  */
 378 int
 379 _kvm_mdopen(kvm_t *kd)
 380 {
 381         u_long max_uva;
 382         extern struct ps_strings *__ps_strings;
 383
 384         max_uva = (u_long) (__ps_strings + 1);
 385         kd->usrstack = max_uva;
 386         kd->max_uva  = max_uva;
 387         kd->min_uva  = 0;
 388
 389         return (0);
 390 }