7f911abe54
- Add a kvaddr_type to represent kernel virtual addresses instead of unsigned long. - Add a struct kvm_nlist which is a stripped down version of struct nlist that uses kvaddr_t for n_value. - Add a kvm_native() routine that returns true if an open kvm descriptor is for a native kernel and memory image. - Add a kvm_open2() function similar to kvm_openfiles(). It drops the unused 'swapfile' argument and adds a new function pointer argument for a symbol resolving function. Native kernels still use _fdnlist() from libc to resolve symbols if a resolver function is not supplied, but cross kernels require a resolver. - Add a kvm_nlist2() function similar to kvm_nlist() except that it uses struct kvm_nlist instead of struct nlist. - Add a kvm_read2() function similar to kvm_read() except that it uses kvaddr_t instead of unsigned long for the kernel virtual address. - Add a new kvm_arch switch of routines needed by a vmcore backend. Each backend is responsible for implementing kvm_read2() for a given vmcore format. - Use libelf to read headers from ELF kernels and cores (except for powerpc cores). - Add internal helper routines for the common page offset hash table used by the minidump backends. - Port all of the existing kvm backends to implement a kvm_arch switch and to be cross-friendly by using private constants instead of ones that vary by platform (e.g. PAGE_SIZE). Static assertions are present when a given backend is compiled natively to ensure the private constants match the real ones. - Enable all of the existing vmcore backends on all platforms. This means that libkvm on any platform should be able to perform KVA translation and read data from a vmcore of any platform. Tested on: amd64, i386, sparc64 (marius) Differential Revision: https://reviews.freebsd.org/D3341
106 lines
3.3 KiB
C
106 lines
3.3 KiB
C
/*-
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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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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* 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_getloadavg.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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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <nlist.h>
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#include <kvm.h>
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#include "kvm_private.h"
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static struct nlist nl[] = {
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{ .n_name = "_averunnable" },
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#define X_AVERUNNABLE 0
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{ .n_name = "_fscale" },
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#define X_FSCALE 1
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{ .n_name = "" },
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};
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/*
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* kvm_getloadavg() -- Get system load averages, from live or dead kernels.
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*
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* Put `nelem' samples into `loadavg' array.
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* Return number of samples retrieved, or -1 on error.
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*/
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int
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kvm_getloadavg(kvm_t *kd, double loadavg[], int nelem)
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{
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struct loadavg loadinfo;
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struct nlist *p;
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int fscale, i;
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if (ISALIVE(kd))
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return (getloadavg(loadavg, nelem));
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if (!kd->arch->ka_native(kd)) {
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_kvm_err(kd, kd->program,
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"cannot read loadavg from non-native core");
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return (-1);
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}
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if (kvm_nlist(kd, nl) != 0) {
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for (p = nl; p->n_type != 0; ++p);
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_kvm_err(kd, kd->program,
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"%s: no such symbol", p->n_name);
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return (-1);
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}
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#define KREAD(kd, addr, obj) \
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(kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj))
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if (KREAD(kd, nl[X_AVERUNNABLE].n_value, &loadinfo)) {
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_kvm_err(kd, kd->program, "can't read averunnable");
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return (-1);
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}
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/*
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* Old kernels have fscale separately; if not found assume
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* running new format.
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*/
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if (!KREAD(kd, nl[X_FSCALE].n_value, &fscale))
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loadinfo.fscale = fscale;
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nelem = MIN(nelem, (int)(sizeof(loadinfo.ldavg) / sizeof(fixpt_t)));
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for (i = 0; i < nelem; i++)
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loadavg[i] = (double) loadinfo.ldavg[i] / loadinfo.fscale;
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return (nelem);
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}
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