5e6220d9d0
longer includes machine/elf.h. * consumers of elf.h now use the minimalist elf header possible. This change is motivated by Binutils 2.11.0 and too much clashing over our base elf headers and the Binutils elf headers.
339 lines
8.5 KiB
C
339 lines
8.5 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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* 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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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1992, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)gcore.c 8.2 (Berkeley) 9/23/93";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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/*
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* Originally written by Eric Cooper in Fall 1981.
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* Inspired by a version 6 program by Len Levin, 1978.
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* Several pieces of code lifted from Bill Joy's 4BSD ps.
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* Most recently, hacked beyond recognition for 4.4BSD by Steven McCanne,
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* Lawrence Berkeley Laboratory.
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*
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* Portions of this software were developed by the Computer Systems
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* Engineering group at Lawrence Berkeley Laboratory under DARPA
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* contract BG 91-66 and contributed to Berkeley.
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*/
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <sys/proc.h>
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#include <sys/user.h>
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#include <sys/sysctl.h>
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#include <machine/elf.h>
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#include <machine/vmparam.h>
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#include <a.out.h>
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#include <err.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <limits.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "extern.h"
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static void core __P((int, int, struct kinfo_proc *));
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static void datadump __P((int, int, struct kinfo_proc *, u_long, int));
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static void killed __P((int));
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static void restart_target __P((void));
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static void usage __P((void)) __dead2;
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static void userdump __P((int, struct kinfo_proc *, u_long, int));
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kvm_t *kd;
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static int data_offset;
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static pid_t pid;
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct kinfo_proc *ki = NULL;
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struct exec exec;
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int ch, cnt, efd, fd, sflag, uid;
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char *binfile, *corefile;
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char errbuf[_POSIX2_LINE_MAX], fname[MAXPATHLEN];
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int is_aout;
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sflag = 0;
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corefile = NULL;
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while ((ch = getopt(argc, argv, "c:s")) != -1) {
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switch (ch) {
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case 'c':
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corefile = optarg;
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break;
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case 's':
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sflag = 1;
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break;
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default:
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usage();
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break;
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}
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}
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argv += optind;
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argc -= optind;
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/* XXX we should check that the pid argument is really a number */
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switch (argc) {
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case 1:
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pid = atoi(argv[0]);
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asprintf(&binfile, "/proc/%d/file", pid);
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if (binfile == NULL)
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errx(1, "allocation failure");
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break;
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case 2:
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pid = atoi(argv[1]);
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binfile = argv[0];
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break;
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default:
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usage();
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}
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efd = open(binfile, O_RDONLY, 0);
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if (efd < 0)
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err(1, "%s", binfile);
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cnt = read(efd, &exec, sizeof(exec));
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if (cnt != sizeof(exec))
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errx(1, "%s exec header: %s",
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binfile, cnt > 0 ? strerror(EIO) : strerror(errno));
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if (!N_BADMAG(exec)) {
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is_aout = 1;
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/*
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* This legacy a.out support uses the kvm interface instead
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* of procfs.
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*/
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kd = kvm_openfiles(0, 0, 0, O_RDONLY, errbuf);
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if (kd == NULL)
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errx(1, "%s", errbuf);
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uid = getuid();
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ki = kvm_getprocs(kd, KERN_PROC_PID, pid, &cnt);
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if (ki == NULL || cnt != 1)
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errx(1, "%d: not found", pid);
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if (ki->ki_ruid != uid && uid != 0)
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errx(1, "%d: not owner", pid);
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if (ki->ki_stat == SZOMB)
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errx(1, "%d: zombie", pid);
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if (ki->ki_flag & P_WEXIT)
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errx(1, "%d: process exiting", pid);
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if (ki->ki_flag & P_SYSTEM) /* Swapper or pagedaemon. */
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errx(1, "%d: system process", pid);
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if (exec.a_text != ptoa(ki->ki_tsize))
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errx(1, "The executable %s does not belong to"
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" process %d!\n"
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"Text segment size (in bytes): executable %ld,"
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" process %d", binfile, pid, exec.a_text,
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ptoa(ki->ki_tsize));
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data_offset = N_DATOFF(exec);
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} else if (IS_ELF(*(Elf_Ehdr *)&exec)) {
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is_aout = 0;
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close(efd);
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} else
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errx(1, "Invalid executable file");
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if (corefile == NULL) {
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(void)snprintf(fname, sizeof(fname), "core.%d", pid);
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corefile = fname;
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}
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fd = open(corefile, O_RDWR|O_CREAT|O_TRUNC, DEFFILEMODE);
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if (fd < 0)
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err(1, "%s", corefile);
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if (sflag) {
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signal(SIGHUP, killed);
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signal(SIGINT, killed);
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signal(SIGTERM, killed);
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if (kill(pid, SIGSTOP) == -1)
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err(1, "%d: stop signal", pid);
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atexit(restart_target);
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}
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if (is_aout)
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core(efd, fd, ki);
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else
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elf_coredump(fd, pid);
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(void)close(fd);
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exit(0);
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}
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/*
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* core --
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* Build the core file.
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*/
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void
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core(efd, fd, ki)
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int efd;
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int fd;
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struct kinfo_proc *ki;
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{
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union {
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struct user user;
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char ubytes[ctob(UPAGES)];
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} uarea;
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int tsize = ki->ki_tsize;
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int dsize = ki->ki_dsize;
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int ssize = ki->ki_ssize;
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int cnt;
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/* Read in user struct */
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cnt = kvm_read(kd, (u_long)ki->ki_addr, &uarea, sizeof(uarea));
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if (cnt != sizeof(uarea))
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errx(1, "read user structure: %s",
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cnt > 0 ? strerror(EIO) : strerror(errno));
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/*
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* Fill in the eproc vm parameters, since these are garbage unless
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* the kernel is dumping core or something.
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*/
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uarea.user.u_kproc = *ki;
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/* Dump user area */
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cnt = write(fd, &uarea, sizeof(uarea));
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if (cnt != sizeof(uarea))
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errx(1, "write user structure: %s",
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cnt > 0 ? strerror(EIO) : strerror(errno));
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/* Dump data segment */
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datadump(efd, fd, ki, USRTEXT + ctob(tsize), dsize);
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/* Dump stack segment */
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userdump(fd, ki, USRSTACK - ctob(ssize), ssize);
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/* Dump machine dependent portions of the core. */
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md_core(kd, fd, ki);
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}
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void
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datadump(efd, fd, kp, addr, npage)
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register int efd;
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register int fd;
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struct kinfo_proc *kp;
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register u_long addr;
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register int npage;
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{
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register int cc, delta;
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char buffer[PAGE_SIZE];
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delta = data_offset - addr;
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while (--npage >= 0) {
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cc = kvm_uread(kd, kp, addr, buffer, PAGE_SIZE);
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if (cc != PAGE_SIZE) {
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/* Try to read the page from the executable. */
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if (lseek(efd, (off_t)addr + delta, SEEK_SET) == -1)
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err(1, "seek executable: %s", strerror(errno));
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cc = read(efd, buffer, sizeof(buffer));
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if (cc != sizeof(buffer)) {
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if (cc < 0)
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err(1, "read executable");
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else /* Assume untouched bss page. */
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bzero(buffer, sizeof(buffer));
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}
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}
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cc = write(fd, buffer, PAGE_SIZE);
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if (cc != PAGE_SIZE)
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errx(1, "write data segment: %s",
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cc > 0 ? strerror(EIO) : strerror(errno));
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addr += PAGE_SIZE;
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}
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}
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static void
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killed(sig)
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int sig;
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{
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restart_target();
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signal(sig, SIG_DFL);
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kill(getpid(), sig);
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}
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static void
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restart_target()
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{
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kill(pid, SIGCONT);
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}
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void
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userdump(fd, kp, addr, npage)
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register int fd;
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struct kinfo_proc *kp;
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register u_long addr;
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register int npage;
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{
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register int cc;
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char buffer[PAGE_SIZE];
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while (--npage >= 0) {
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cc = kvm_uread(kd, kp, addr, buffer, PAGE_SIZE);
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if (cc != PAGE_SIZE)
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/* Could be an untouched fill-with-zero page. */
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bzero(buffer, PAGE_SIZE);
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cc = write(fd, buffer, PAGE_SIZE);
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if (cc != PAGE_SIZE)
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errx(1, "write stack segment: %s",
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cc > 0 ? strerror(EIO) : strerror(errno));
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addr += PAGE_SIZE;
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}
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}
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void
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usage()
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{
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(void)fprintf(stderr, "usage: gcore [-s] [-c core] executable pid\n");
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exit(1);
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}
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