1159720Syar/*- 2159720Syar * Copyright (c) 2006 The FreeBSD Project 3159720Syar * All rights reserved. 4159720Syar * 5159720Syar * Redistribution and use in source and binary forms, with or without 6159720Syar * modification, are permitted provided that the following conditions 7159720Syar * are met: 8159720Syar * 1. Redistributions of source code must retain the above copyright 9159720Syar * notice, this list of conditions and the following disclaimer. 10159720Syar * 2. Redistributions in binary form must reproduce the above copyright 11159720Syar * notice, this list of conditions and the following disclaimer in the 12159720Syar * documentation and/or other materials provided with the distribution. 13159720Syar * 14159720Syar * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15159720Syar * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16159720Syar * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17159720Syar * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18159720Syar * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19159720Syar * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20159720Syar * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21159720Syar * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22159720Syar * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23159720Syar * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24159720Syar * SUCH DAMAGE. 25159720Syar */ 26159720Syar 27159720Syar#include <sys/cdefs.h> 28159720Syar__FBSDID("$FreeBSD$"); 29159720Syar 30159720Syar#include <sys/types.h> 31159720Syar#include <sys/param.h> 32159720Syar#include <sys/queue.h> /* for <sys/linker.h> with _KERNEL defined */ 33159720Syar#include <err.h> 34159720Syar#include <fcntl.h> 35159720Syar#include <kvm.h> 36159720Syar#include <limits.h> 37159720Syar#include <nlist.h> 38159720Syar#include <stdlib.h> 39159720Syar#include <string.h> 40159720Syar 41159720Syar#define _KERNEL 42159720Syar#include <sys/linker.h> 43159720Syar#undef _KERNEL 44159720Syar 45159720Syar#include "asf.h" 46159720Syar 47159720Syar/* Name of the head of the linker file list in /sys/kern/kern_linker.c */ 48159720Syar#define LINKER_HEAD "linker_files" 49159720Syar 50159720Syar/* 51159720Syar * Get the list of linker files using kvm(3). 52159720Syar * Can work with a live kernel as well as with a crash dump. 53159720Syar */ 54159720Syarvoid 55159720Syarasf_kvm(const char *kernfile, const char *corefile) 56159720Syar{ 57159720Syar char errbuf[LINE_MAX]; 58159720Syar char name[PATH_MAX]; 59159720Syar kvm_t *kd; 60159720Syar struct nlist nl[2]; 61159720Syar struct linker_file lf; 62159720Syar linker_file_list_t linker_files; 63159720Syar ssize_t n; 64159720Syar void *kp; 65159720Syar 66159720Syar kd = kvm_openfiles(kernfile, corefile, NULL, O_RDONLY, errbuf); 67159720Syar if (kd == NULL) 68159720Syar errx(2, "open kernel memory: %s", errbuf); 69159720Syar 70159720Syar /* 71159720Syar * Locate the head of the linker file list using kernel symbols. 72159720Syar */ 73159720Syar strcpy(name, LINKER_HEAD); 74159720Syar nl[0].n_name = name; /* can't use LINKER_HEAD here because it's const */ 75159720Syar nl[1].n_name = NULL; /* terminate the array for kvm_nlist() */ 76159720Syar switch (kvm_nlist(kd, nl)) { 77159720Syar case 0: 78159720Syar break; 79159720Syar case -1: 80159720Syar warnx("%s: %s", LINKER_HEAD, kvm_geterr(kd)); 81159720Syar kvm_close(kd); 82159720Syar exit(2); 83159720Syar default: 84159720Syar kvm_close(kd); 85159720Syar errx(2, "%s: symbol not found", LINKER_HEAD); 86159720Syar } 87159720Syar 88159720Syar /* 89159720Syar * Read the head of the linker file list from kernel memory. 90159720Syar */ 91159720Syar n = kvm_read(kd, nl[0].n_value, &linker_files, sizeof(linker_files)); 92159720Syar if (n == -1) 93159720Syar goto read_err; 94159720Syar if (n != sizeof(linker_files)) { 95159720Syar kvm_close(kd); 96159720Syar errx(2, "%s: short read", LINKER_HEAD); 97159720Syar } 98159720Syar 99159720Syar /* 100159720Syar * Traverse the linker file list starting at its head. 101159720Syar */ 102159720Syar for (kp = linker_files.tqh_first; kp; kp = lf.link.tqe_next) { 103159720Syar /* Read a linker file structure */ 104159720Syar n = kvm_read(kd, (u_long)kp, &lf, sizeof(lf)); 105159720Syar if (n == -1) 106159720Syar goto read_err; 107159720Syar if (n != sizeof(lf)) { 108159720Syar kvm_close(kd); 109159720Syar errx(2, "kvm: short read"); 110159720Syar } 111159720Syar /* Read the name of the file stored separately */ 112159720Syar bzero(name, sizeof(name)); 113159720Syar n = kvm_read(kd, (u_long)lf.filename, name, sizeof(name) - 1); 114159720Syar if (n == -1) 115159720Syar goto read_err; 116159720Syar if (strcmp(name, KERNFILE) == 0) 117159720Syar continue; 118159720Syar /* Add this file to our list of linker files */ 119159720Syar kfile_add(name, lf.address); 120159720Syar } 121159720Syar kvm_close(kd); 122159720Syar return; 123159720Syar 124159720Syarread_err: /* A common error case */ 125159720Syar warnx("read kernel memory: %s", kvm_geterr(kd)); 126159720Syar kvm_close(kd); 127159720Syar exit(2); 128159720Syar} 129