diff options
Diffstat (limited to 'lib/libkvm/kvm_x86_64.c')
| -rw-r--r-- | lib/libkvm/kvm_x86_64.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/lib/libkvm/kvm_x86_64.c b/lib/libkvm/kvm_x86_64.c new file mode 100644 index 00000000000..b1b4b93046d --- /dev/null +++ b/lib/libkvm/kvm_x86_64.c @@ -0,0 +1,209 @@ +/* $OpenBSD: kvm_x86_64.c,v 1.1 2004/01/28 01:51:40 mickey Exp $ */ +/* $NetBSD: kvm_x86_64.c,v 1.3 2002/06/05 22:01:55 fvdl Exp $ */ + +/*- + * Copyright (c) 1989, 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software developed by the Computer Systems + * Engineering group at Lawrence Berkeley Laboratory under DARPA contract + * BG 91-66 and contributed to Berkeley. + * + * 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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> + +/* + * x86-64 machine dependent routines for kvm. + */ + +#include <sys/param.h> +#include <sys/user.h> +#include <sys/proc.h> +#include <sys/stat.h> +#include <sys/kcore.h> +#include <machine/kcore.h> +#include <stdlib.h> +#include <unistd.h> +#include <nlist.h> +#include <kvm.h> + +#include <uvm/uvm_extern.h> + +#include <limits.h> +#include <db.h> + +#include "kvm_private.h" + +#include <machine/pmap.h> +#include <machine/pte.h> +#include <machine/vmparam.h> + +void +_kvm_freevtop(kd) + kvm_t *kd; +{ + + /* Not actually used for anything right now, but safe. */ + if (kd->vmst != 0) + free(kd->vmst); +} + +/*ARGSUSED*/ +int +_kvm_initvtop(kd) + kvm_t *kd; +{ + + return (0); +} + +/* + * Translate a kernel virtual address to a physical address. + */ +int +_kvm_kvatop(kd, va, pa) + kvm_t *kd; + u_long va; + u_long *pa; +{ + cpu_kcore_hdr_t *cpu_kh; + u_long page_off; + pd_entry_t pde; + pt_entry_t pte; + paddr_t pde_pa, pte_pa; + + if (ISALIVE(kd)) { + _kvm_err(kd, 0, "vatop called in live kernel!"); + return (0); + } + + cpu_kh = kd->cpu_data; + page_off = va & PGOFSET; + + /* + * Find and read all entries to get to the pa. + */ + + /* + * Level 4. + */ + pde_pa = cpu_kh->ptdpaddr + (pl4_i(va) * sizeof(pd_entry_t)); + if (pread(kd->pmfd, (void *)&pde, sizeof(pde), + _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { + _kvm_syserr(kd, 0, "could not read PT level 4 entry"); + goto lose; + } + if ((pde & PG_V) == 0) { + _kvm_err(kd, 0, "invalid translation (invalid level 4 PDE)"); + goto lose; + } + + /* + * Level 3. + */ + pde_pa = (pde_pa + PG_FRAME) + (pl3_i(va) * sizeof(pd_entry_t)); + if (pread(kd->pmfd, (void *)&pde, sizeof(pde), + _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { + _kvm_syserr(kd, 0, "could not read PT level 3 entry"); + goto lose; + } + if ((pde & PG_V) == 0) { + _kvm_err(kd, 0, "invalid translation (invalid level 3 PDE)"); + goto lose; + } + + /* + * Level 2. + */ + pde_pa = (pde_pa & PG_FRAME) + (pl2_i(va) * sizeof(pd_entry_t)); + if (pread(kd->pmfd, (void *)&pde, sizeof(pde), + _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { + _kvm_syserr(kd, 0, "could not read PT level 2 entry"); + goto lose; + } + if ((pde & PG_V) == 0) { + _kvm_err(kd, 0, "invalid translation (invalid level 2 PDE)"); + goto lose; + } + + + /* + * Level 1. + */ + pte_pa = (pde_pa & PG_FRAME) + (pl1_i(va) * sizeof(pt_entry_t)); + if (pread(kd->pmfd, (void *) &pte, sizeof(pte), + _kvm_pa2off(kd, pte_pa)) != sizeof(pte)) { + _kvm_syserr(kd, 0, "could not read PTE"); + goto lose; + } + /* + * Validate the PTE and return the physical address. + */ + if ((pte & PG_V) == 0) { + _kvm_err(kd, 0, "invalid translation (invalid PTE)"); + goto lose; + } + *pa = (pte & PG_FRAME) + page_off; + return (int)(NBPG - page_off); + + lose: + *pa = (u_long)~0L; + return (0); +} + +/* + * Translate a physical address to a file-offset in the crash dump. + */ +off_t +_kvm_pa2off(kd, pa) + kvm_t *kd; + u_long pa; +{ + cpu_kcore_hdr_t *cpu_kh; + phys_ram_seg_t *ramsegs; + off_t off; + int i; + + cpu_kh = kd->cpu_data; + ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh)); + + off = 0; + for (i = 0; i < cpu_kh->nmemsegs; i++) { + if (pa >= ramsegs[i].start && + (pa - ramsegs[i].start) < ramsegs[i].size) { + off += (pa - ramsegs[i].start); + break; + } + off += ramsegs[i].size; + } + + return (kd->dump_off + off); +} |