mirror of
https://git.FreeBSD.org/src.git
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e55a0cd805
returned an lseek offset in a "u_long *" value, which can't express >4GB offsets on 32 bit machines (eg: PAE). Change to "off_t *" for all. Support ELF crashdumps on i386 and amd64. Support PAE crashdumps on i386. This is done by auto-detecting the presence of the IdlePDPT which means that PAE is active. I used Marcel's _kvm_pa2off strategy and ELF header reader for ELF support on amd64. Paul Saab ported the amd64 changes to i386 and we implemented the PAE support from there. Note that gdb6 in the src tree uses whatever libkvm supports. If you want to debug an old crash dump, you might want to keep an old libkvm.so handy and use LD_PRELOAD or the like. This does not detect the old raw dump format. Approved by: re
241 lines
6.8 KiB
C
241 lines
6.8 KiB
C
/*-
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software developed by the Computer Systems
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* Engineering group at Lawrence Berkeley Laboratory under DARPA contract
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* BG 91-66 and contributed to Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)kvm_sparc.c 8.1 (Berkeley) 6/4/93";
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#endif
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#endif /* LIBC_SCCS and not lint */
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/*
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* Sparc machine dependent routines for kvm. Hopefully, the forthcoming
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* vm code will one day obsolete this module.
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*/
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#include <sys/param.h>
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#include <sys/user.h>
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#include <sys/proc.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <nlist.h>
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#include <kvm.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <limits.h>
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#include "kvm_private.h"
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#define NPMEG 128
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/* XXX from sparc/pmap.c */
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#define MAXMEM (128 * 1024 * 1024) /* no more than 128 MB phys mem */
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#define NPGBANK 16 /* 2^4 pages per bank (64K / bank) */
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#define BSHIFT 4 /* log2(NPGBANK) */
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#define BOFFSET (NPGBANK - 1)
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#define BTSIZE (MAXMEM / NBPG / NPGBANK)
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#define HWTOSW(pmap_stod, pg) (pmap_stod[(pg) >> BSHIFT] | ((pg) & BOFFSET))
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struct vmstate {
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pmeg_t segmap[NKSEG];
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int pmeg[NPMEG][NPTESG];
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int pmap_stod[BTSIZE]; /* dense to sparse */
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};
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void
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_kvm_freevtop(kd)
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kvm_t *kd;
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{
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if (kd->vmst != 0)
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free(kd->vmst);
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}
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int
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_kvm_initvtop(kd)
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kvm_t *kd;
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{
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int i;
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int off;
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struct vmstate *vm;
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struct stat st;
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struct nlist nlist[2];
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vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
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if (vm == 0)
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return (-1);
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kd->vmst = vm;
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if (fstat(kd->pmfd, &st) < 0)
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return (-1);
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/*
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* Read segment table.
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*/
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off = st.st_size - ctob(btoc(sizeof(vm->segmap)));
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errno = 0;
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if (lseek(kd->pmfd, (off_t)off, 0) == -1 && errno != 0 ||
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read(kd->pmfd, (char *)vm->segmap, sizeof(vm->segmap)) < 0) {
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_kvm_err(kd, kd->program, "cannot read segment map");
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return (-1);
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}
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/*
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* Read PMEGs.
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*/
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off = st.st_size - ctob(btoc(sizeof(vm->pmeg)) +
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btoc(sizeof(vm->segmap)));
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errno = 0;
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if (lseek(kd->pmfd, (off_t)off, 0) == -1 && errno != 0 ||
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read(kd->pmfd, (char *)vm->pmeg, sizeof(vm->pmeg)) < 0) {
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_kvm_err(kd, kd->program, "cannot read PMEG table");
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return (-1);
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}
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/*
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* Make pmap_stod be an identity map so we can bootstrap it in.
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* We assume it's in the first contiguous chunk of physical memory.
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*/
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for (i = 0; i < BTSIZE; ++i)
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vm->pmap_stod[i] = i << 4;
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/*
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* It's okay to do this nlist separately from the one kvm_getprocs()
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* does, since the only time we could gain anything by combining
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* them is if we do a kvm_getprocs() on a dead kernel, which is
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* not too common.
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*/
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nlist[0].n_name = "_pmap_stod";
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nlist[1].n_name = 0;
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if (kvm_nlist(kd, nlist) != 0) {
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_kvm_err(kd, kd->program, "pmap_stod: no such symbol");
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return (-1);
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}
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if (kvm_read(kd, (u_long)nlist[0].n_value,
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(char *)vm->pmap_stod, sizeof(vm->pmap_stod))
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!= sizeof(vm->pmap_stod)) {
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_kvm_err(kd, kd->program, "cannot read pmap_stod");
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return (-1);
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}
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return (0);
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}
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#define VA_OFF(va) (va & (NBPG - 1))
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/*
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* Translate a user virtual address to a physical address.
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*/
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int
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_kvm_uvatop(kd, p, va, pa)
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kvm_t *kd;
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const struct proc *p;
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u_long va;
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u_long *pa;
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{
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int kva, pte;
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int off, frame;
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struct vmspace *vms = p->p_vmspace;
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if ((u_long)vms < KERNBASE) {
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_kvm_err(kd, kd->program, "_kvm_uvatop: corrupt proc");
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return (0);
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}
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if (va >= KERNBASE)
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return (0);
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/*
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* Get the PTE. This takes two steps. We read the
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* base address of the table, then we index it.
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* Note that the index pte table is indexed by
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* virtual segment rather than physical segment.
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*/
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kva = (u_long)&vms->vm_pmap.pm_rpte[VA_VSEG(va)];
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if (kvm_read(kd, kva, (char *)&kva, 4) != 4 || kva == 0)
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goto invalid;
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kva += sizeof(vms->vm_pmap.pm_rpte[0]) * VA_VPG(va);
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if (kvm_read(kd, kva, (char *)&pte, 4) == 4 && (pte & PG_V)) {
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off = VA_OFF(va);
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/*
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* /dev/mem adheres to the hardware model of physical memory
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* (with holes in the address space), while crashdumps
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* adhere to the contiguous software model.
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*/
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if (ISALIVE(kd))
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frame = pte & PG_PFNUM;
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else
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frame = HWTOSW(kd->vmst->pmap_stod, pte & PG_PFNUM);
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*pa = (frame << PGSHIFT) | off;
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return (NBPG - off);
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}
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invalid:
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_kvm_err(kd, 0, "invalid address (%x)", va);
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return (0);
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}
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/*
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* Translate a kernel virtual address to a physical address using the
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* mapping information in kd->vm. Returns the result in pa, and returns
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* the number of bytes that are contiguously available from this
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* physical address. This routine is used only for crashdumps.
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*/
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int
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_kvm_kvatop(kd, va, pa)
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kvm_t *kd;
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u_long va;
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uint64_t *pa;
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{
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struct vmstate *vm;
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int s;
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int pte;
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int off;
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if (va >= KERNBASE) {
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vm = kd->vmst;
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s = vm->segmap[VA_VSEG(va) - NUSEG];
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pte = vm->pmeg[s][VA_VPG(va)];
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if ((pte & PG_V) != 0) {
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off = VA_OFF(va);
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*pa = (HWTOSW(vm->pmap_stod, pte & PG_PFNUM)
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<< PGSHIFT) | off;
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return (NBPG - off);
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}
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}
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_kvm_err(kd, 0, "invalid address (%x)", va);
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return (0);
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}
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