Current Path : /compat/linux/proc/68247/cwd/usr/src/lib/libkvm/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //compat/linux/proc/68247/cwd/usr/src/lib/libkvm/kvm_minidump_amd64.c |
/*- * Copyright (c) 2006 Peter Wemm * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD: release/9.1.0/lib/libkvm/kvm_minidump_amd64.c 217744 2011-01-23 11:08:28Z uqs $"); /* * AMD64 machine dependent routines for kvm and minidumps. */ #include <sys/param.h> #include <sys/user.h> #include <sys/proc.h> #include <sys/stat.h> #include <sys/mman.h> #include <sys/fnv_hash.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <nlist.h> #include <kvm.h> #include <vm/vm.h> #include <vm/vm_param.h> #include <machine/elf.h> #include <machine/cpufunc.h> #include <machine/minidump.h> #include <limits.h> #include "kvm_private.h" struct hpte { struct hpte *next; vm_paddr_t pa; int64_t off; }; #define HPT_SIZE 1024 /* minidump must be the first item! */ struct vmstate { int minidump; /* 1 = minidump mode */ struct minidumphdr hdr; void *hpt_head[HPT_SIZE]; uint64_t *bitmap; uint64_t *page_map; }; static void hpt_insert(kvm_t *kd, vm_paddr_t pa, int64_t off) { struct hpte *hpte; uint32_t fnv = FNV1_32_INIT; fnv = fnv_32_buf(&pa, sizeof(pa), fnv); fnv &= (HPT_SIZE - 1); hpte = malloc(sizeof(*hpte)); hpte->pa = pa; hpte->off = off; hpte->next = kd->vmst->hpt_head[fnv]; kd->vmst->hpt_head[fnv] = hpte; } static int64_t hpt_find(kvm_t *kd, vm_paddr_t pa) { struct hpte *hpte; uint32_t fnv = FNV1_32_INIT; fnv = fnv_32_buf(&pa, sizeof(pa), fnv); fnv &= (HPT_SIZE - 1); for (hpte = kd->vmst->hpt_head[fnv]; hpte != NULL; hpte = hpte->next) { if (pa == hpte->pa) return (hpte->off); } return (-1); } static int inithash(kvm_t *kd, uint64_t *base, int len, off_t off) { uint64_t idx; uint64_t bit, bits; vm_paddr_t pa; for (idx = 0; idx < len / sizeof(*base); idx++) { bits = base[idx]; while (bits) { bit = bsfq(bits); bits &= ~(1ul << bit); pa = (idx * sizeof(*base) * NBBY + bit) * PAGE_SIZE; hpt_insert(kd, pa, off); off += PAGE_SIZE; } } return (off); } void _kvm_minidump_freevtop(kvm_t *kd) { struct vmstate *vm = kd->vmst; if (vm->bitmap) free(vm->bitmap); if (vm->page_map) free(vm->page_map); free(vm); kd->vmst = NULL; } int _kvm_minidump_initvtop(kvm_t *kd) { struct vmstate *vmst; off_t off; vmst = _kvm_malloc(kd, sizeof(*vmst)); if (vmst == 0) { _kvm_err(kd, kd->program, "cannot allocate vm"); return (-1); } kd->vmst = vmst; vmst->minidump = 1; if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) != sizeof(vmst->hdr)) { _kvm_err(kd, kd->program, "cannot read dump header"); return (-1); } if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, sizeof(vmst->hdr.magic)) != 0) { _kvm_err(kd, kd->program, "not a minidump for this platform"); return (-1); } /* * NB: amd64 minidump header is binary compatible between version 1 * and version 2; this may not be the case for the future versions. */ if (vmst->hdr.version != MINIDUMP_VERSION && vmst->hdr.version != 1) { _kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version); return (-1); } /* Skip header and msgbuf */ off = PAGE_SIZE + round_page(vmst->hdr.msgbufsize); vmst->bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize); if (vmst->bitmap == NULL) { _kvm_err(kd, kd->program, "cannot allocate %d bytes for bitmap", vmst->hdr.bitmapsize); return (-1); } if (pread(kd->pmfd, vmst->bitmap, vmst->hdr.bitmapsize, off) != vmst->hdr.bitmapsize) { _kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", vmst->hdr.bitmapsize); return (-1); } off += round_page(vmst->hdr.bitmapsize); vmst->page_map = _kvm_malloc(kd, vmst->hdr.pmapsize); if (vmst->page_map == NULL) { _kvm_err(kd, kd->program, "cannot allocate %d bytes for page_map", vmst->hdr.pmapsize); return (-1); } if (pread(kd->pmfd, vmst->page_map, vmst->hdr.pmapsize, off) != vmst->hdr.pmapsize) { _kvm_err(kd, kd->program, "cannot read %d bytes for page_map", vmst->hdr.pmapsize); return (-1); } off += vmst->hdr.pmapsize; /* build physical address hash table for sparse pages */ inithash(kd, vmst->bitmap, vmst->hdr.bitmapsize, off); return (0); } static int _kvm_minidump_vatop_v1(kvm_t *kd, u_long va, off_t *pa) { struct vmstate *vm; u_long offset; pt_entry_t pte; u_long pteindex; u_long a; off_t ofs; vm = kd->vmst; offset = va & (PAGE_SIZE - 1); if (va >= vm->hdr.kernbase) { pteindex = (va - vm->hdr.kernbase) >> PAGE_SHIFT; pte = vm->page_map[pteindex]; if (((u_long)pte & PG_V) == 0) { _kvm_err(kd, kd->program, "_kvm_vatop: pte not valid"); goto invalid; } a = pte & PG_FRAME; ofs = hpt_find(kd, a); if (ofs == -1) { _kvm_err(kd, kd->program, "_kvm_vatop: physical address 0x%lx not in minidump", a); goto invalid; } *pa = ofs + offset; return (PAGE_SIZE - offset); } else if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) { a = (va - vm->hdr.dmapbase) & ~PAGE_MASK; ofs = hpt_find(kd, a); if (ofs == -1) { _kvm_err(kd, kd->program, "_kvm_vatop: direct map address 0x%lx not in minidump", va); goto invalid; } *pa = ofs + offset; return (PAGE_SIZE - offset); } else { _kvm_err(kd, kd->program, "_kvm_vatop: virtual address 0x%lx not minidumped", va); goto invalid; } invalid: _kvm_err(kd, 0, "invalid address (0x%lx)", va); return (0); } static int _kvm_minidump_vatop(kvm_t *kd, u_long va, off_t *pa) { pt_entry_t pt[NPTEPG]; struct vmstate *vm; u_long offset; pd_entry_t pde; pd_entry_t pte; u_long pteindex; u_long pdeindex; u_long a; off_t ofs; vm = kd->vmst; offset = va & PAGE_MASK; if (va >= vm->hdr.kernbase) { pdeindex = (va - vm->hdr.kernbase) >> PDRSHIFT; pde = vm->page_map[pdeindex]; if (((u_long)pde & PG_V) == 0) { _kvm_err(kd, kd->program, "_kvm_vatop: pde not valid"); goto invalid; } if ((pde & PG_PS) == 0) { a = pde & PG_FRAME; ofs = hpt_find(kd, a); if (ofs == -1) { _kvm_err(kd, kd->program, "_kvm_vatop: pt physical address 0x%lx not in minidump", a); goto invalid; } if (pread(kd->pmfd, &pt, PAGE_SIZE, ofs) != PAGE_SIZE) { _kvm_err(kd, kd->program, "cannot read %d bytes for pt", PAGE_SIZE); return (-1); } pteindex = (va >> PAGE_SHIFT) & ((1ul << NPTEPGSHIFT) - 1); pte = pt[pteindex]; if (((u_long)pte & PG_V) == 0) { _kvm_err(kd, kd->program, "_kvm_vatop: pte not valid"); goto invalid; } a = pte & PG_FRAME; } else { a = pde & PG_PS_FRAME; a += (va & PDRMASK) ^ offset; } ofs = hpt_find(kd, a); if (ofs == -1) { _kvm_err(kd, kd->program, "_kvm_vatop: physical address 0x%lx not in minidump", a); goto invalid; } *pa = ofs + offset; return (PAGE_SIZE - offset); } else if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) { a = (va - vm->hdr.dmapbase) & ~PAGE_MASK; ofs = hpt_find(kd, a); if (ofs == -1) { _kvm_err(kd, kd->program, "_kvm_vatop: direct map address 0x%lx not in minidump", va); goto invalid; } *pa = ofs + offset; return (PAGE_SIZE - offset); } else { _kvm_err(kd, kd->program, "_kvm_vatop: virtual address 0x%lx not minidumped", va); goto invalid; } invalid: _kvm_err(kd, 0, "invalid address (0x%lx)", va); return (0); } int _kvm_minidump_kvatop(kvm_t *kd, u_long va, off_t *pa) { if (ISALIVE(kd)) { _kvm_err(kd, 0, "kvm_kvatop called in live kernel!"); return (0); } if (((struct vmstate *)kd->vmst)->hdr.version == 1) return (_kvm_minidump_vatop_v1(kd, va, pa)); else return (_kvm_minidump_vatop(kd, va, pa)); }