Differential D3727 Diff 8972 devel/gdb/files/kgdb/kgdb-main.c

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devel/gdb/files/kgdb/kgdb-main.c

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				/*
				* Copyright (c) 2004 Marcel Moolenaar
				* All rights reserved.
				*
				* 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.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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>
				__FBSDID("$FreeBSD: head/gnu/usr.bin/gdb/kgdb/main.c 260027 2013-12-28 23:31:22Z marcel $");

				#include <sys/param.h>
				#include <sys/stat.h>
				#include <sys/types.h>
				#include <sys/ioctl.h>
				#include <sys/resource.h>
				#include <sys/select.h>
				#include <sys/time.h>
				#include <sys/wait.h>
				#include <errno.h>
				#include <err.h>
				#include <inttypes.h>
				#include <kvm.h>
				#include <limits.h>
				#include <paths.h>

				/* libgdb stuff. */
				#include <defs.h>
				#include <frame.h>
				#include <frame-unwind.h>
				#include <inferior.h>
				#include <interps.h>
				#include <cli-out.h>
				#include <main.h>
				#include <objfiles.h>
				#include "observer.h"
				#include <target.h>
				#include <top.h>
				#include <ui-file.h>
				#include <bfd.h>
				#include <gdbcore.h>

				#include <unistd.h>

				#include "kgdb.h"

				static int dumpnr;
				static int verbose;

				static char crashdir[PATH_MAX];
				static char *kernel;
				static char *remote;
				static char *vmcore;

				/*
				* TODO:
				* - test remote kgdb (see if threads and klds work)
				* - possibly split kthr.c out into a separate thread_stratum target that
				* uses new_objfile test to push itself when a FreeBSD kernel is loaded
				* (check for kernel osabi) (probably don't bother with this)
				* + test alternate kgdb_lookup()
				* + fix kgdb build on amd64 to include i386 cross-debug support
				* - propose expanded libkvm interface that supports cross-debug and moves
				* MD bits of kgdb into the library (examining PCB's and exporting a
				* stable-ABI struct of registers, similarly for trapframe handling and
				* stop-pcb stuff
				* + use tid's as lwp IDs instead of PIDs in ptid's
				*/

				static void
				usage(void)
				{

				fprintf(stderr,
				"usage: %s [-afqvw] [-b rate] [-d crashdir] [-c core \| -n dumpnr \| -r device]\n"
				"\t[kernel [core]]\n", getprogname());
				exit(1);
				}

				static void
				kernel_from_dumpnr(int nr)
				{
				char path[PATH_MAX];
				FILE *info;
				char *s;
				struct stat st;
				int l;

				/*
				* If there's a kernel image right here in the crash directory, then
				* use it. The kernel image is either called kernel.<nr> or is in a
				* subdirectory kernel.<nr> and called kernel. The latter allows us
				* to collect the modules in the same place.
				*/
				snprintf(path, sizeof(path), "%s/kernel.%d", crashdir, nr);
				if (stat(path, &st) == 0) {
				if (S_ISREG(st.st_mode)) {
				kernel = strdup(path);
				return;
				}
				if (S_ISDIR(st.st_mode)) {
				snprintf(path, sizeof(path), "%s/kernel.%d/kernel",
				crashdir, nr);
				if (stat(path, &st) == 0 && S_ISREG(st.st_mode)) {
				kernel = strdup(path);
				return;
				}
				}
				}

				/*
				* No kernel image here. Parse the dump header. The kernel object
				* directory can be found there and we probably have the kernel
				* image still in it. The object directory may also have a kernel
				* with debugging info (called kernel.debug). If we have a debug
				* kernel, use it.
				*/
				snprintf(path, sizeof(path), "%s/info.%d", crashdir, nr);
				info = fopen(path, "r");
				if (info == NULL) {
				warn("%s", path);
				return;
				}
				while (fgets(path, sizeof(path), info) != NULL) {
				l = strlen(path);
				if (l > 0 && path[l - 1] == '\n')
				path[--l] = '\0';
				if (strncmp(path, " ", 4) == 0) {
				s = strchr(path, ':');
				s = (s == NULL) ? path + 4 : s + 1;
				l = snprintf(path, sizeof(path), "%s/kernel.debug", s);
				if (stat(path, &st) == -1 \|\| !S_ISREG(st.st_mode)) {
				path[l - 6] = '\0';
				if (stat(path, &st) == -1 \|\|
				!S_ISREG(st.st_mode))
				break;
				}
				kernel = strdup(path);
				break;
				}
				}
				fclose(info);
				}

				/*
				* Remote targets can support any number of syntaxes and we want to
				* support them all with one addition: we support specifying a device
				* node for a serial device without the "/dev/" prefix.
				*
				* What we do is to stat(2) the existing remote target first. If that
				* fails, we try it with "/dev/" prepended. If that succeeds we use
				* the resulting path, otherwise we use the original target. If
				* either stat(2) succeeds make sure the file is either a character
				* device or a FIFO.
				*/
				static void
				verify_remote(void)
				{
				char path[PATH_MAX];
				struct stat st;

				if (stat(remote, &st) != 0) {
				snprintf(path, sizeof(path), "/dev/%s", remote);
				if (stat(path, &st) != 0)
				return;
				free(remote);
				remote = strdup(path);
				}
				if (!S_ISCHR(st.st_mode) && !S_ISFIFO(st.st_mode))
				errx(1, "%s: not a special file, FIFO or socket", remote);
				}

				static void
				add_arg(struct captured_main_args args, char arg)
				{

				args->argc++;
				args->argv = reallocf(args->argv, (args->argc + 1) * sizeof(char *));
				if (args->argv == NULL)
				err(1, "Out of memory building argument list");
				args->argv[args->argc] = arg;
				}

				int
				main(int argc, char *argv[])
				{
				char path[PATH_MAX];
				struct stat st;
				struct captured_main_args args;
				char *s;
				int a, ch;

				dumpnr = -1;

				strlcpy(crashdir, "/var/crash", sizeof(crashdir));
				s = getenv("KGDB_CRASH_DIR");
				if (s != NULL)
				strlcpy(crashdir, s, sizeof(crashdir));

				/* Convert long options into short options. */
				for (a = 1; a < argc; a++) {
				s = argv[a];
				if (s[0] == '-') {
				s++;
				/* Long options take either 1 or 2 dashes. */
				if (s[0] == '-')
				s++;
				if (strcmp(s, "quiet") == 0)
				argv[a] = "-q";
				else if (strcmp(s, "fullname") == 0)
				argv[a] = "-f";
				}
				}

				kgdb_quiet = 0;
				memset (&args, 0, sizeof args);
				args.interpreter_p = INTERP_CONSOLE;
				args.argv = malloc(sizeof(char *));
				args.argv[0] = argv[0];

				while ((ch = getopt(argc, argv, "ab:c:d:fn:qr:vw")) != -1) {
				switch (ch) {
				case 'a':
				annotation_level++;
				break;
				case 'b': {
				int i;
				char *p;

				i = strtol(optarg, &p, 0);
				if (*p != '\0' \|\| p == optarg)
				warnx("warning: could not set baud rate to `%s'.\n",
				optarg);
				else
				baud_rate = i;
				break;
				}
				case 'c': /* use given core file. */
				if (vmcore != NULL) {
				warnx("option %c: can only be specified once",
				optopt);
				usage();
				/* NOTREACHED */
				}
				vmcore = strdup(optarg);
				break;
				case 'd': /* lookup dumps in given directory. */
				strlcpy(crashdir, optarg, sizeof(crashdir));
				break;
				case 'f':
				annotation_level = 1;
				break;
				case 'n': /* use dump with given number. */
				dumpnr = strtol(optarg, &s, 0);
				if (dumpnr < 0 \|\| *s != '\0') {
				warnx("option %c: invalid kernel dump number",
				optopt);
				usage();
				/* NOTREACHED */
				}
				break;
				case 'q':
				kgdb_quiet = 1;
				add_arg(&args, "-q");
				break;
				case 'r': /* use given device for remote session. */
				if (remote != NULL) {
				warnx("option %c: can only be specified once",
				optopt);
				usage();
				/* NOTREACHED */
				}
				remote = strdup(optarg);
				break;
				case 'v': /* increase verbosity. */
				verbose++;
				break;
				case 'w': /* core file is writeable. */
				add_arg(&args, "--write");
				break;
				case '?':
				default:
				usage();
				}
				}

				if (((vmcore != NULL) ? 1 : 0) + ((dumpnr >= 0) ? 1 : 0) +
				((remote != NULL) ? 1 : 0) > 1) {
				warnx("options -c, -n and -r are mutually exclusive");
				usage();
				/* NOTREACHED */
				}

				if (verbose > 1)
				warnx("using %s as the crash directory", crashdir);

				if (argc > optind)
				kernel = strdup(argv[optind++]);

				if (argc > optind && (dumpnr >= 0 \|\| remote != NULL)) {
				warnx("options -n and -r do not take a core file. Ignored");
				optind = argc;
				}

				if (dumpnr >= 0) {
				snprintf(path, sizeof(path), "%s/vmcore.%d", crashdir, dumpnr);
				if (stat(path, &st) == -1)
				err(1, "%s", path);
				if (!S_ISREG(st.st_mode))
				errx(1, "%s: not a regular file", path);
				vmcore = strdup(path);
				} else if (remote != NULL) {
				verify_remote();
				} else if (argc > optind) {
				if (vmcore == NULL)
				vmcore = strdup(argv[optind++]);
				if (argc > optind)
				warnx("multiple core files specified. Ignored");
				} else if (vmcore == NULL && kernel == NULL) {
				vmcore = strdup(_PATH_MEM);
				kernel = strdup(getbootfile());
				}

				if (verbose) {
				if (vmcore != NULL)
				warnx("core file: %s", vmcore);
				if (remote != NULL)
				warnx("device file: %s", remote);
				if (kernel != NULL)
				warnx("kernel image: %s", kernel);
				}

				/* A remote target requires an explicit kernel argument. */
				if (remote != NULL && kernel == NULL) {
				warnx("remote debugging requires a kernel");
				usage();
				/* NOTREACHED */
				}

				/* If we don't have a kernel image yet, try to find one. */
				if (kernel == NULL) {
				if (dumpnr >= 0)
				kernel_from_dumpnr(dumpnr);

				if (kernel == NULL)
				errx(1, "couldn't find a suitable kernel image");
				if (verbose)
				warnx("kernel image: %s", kernel);
				}

				/* Set an alternate prompt. */
				add_arg(&args, "-iex");
				add_arg(&args, "set prompt (kgdb) ");

				/* Open the vmcore if requested. */
				if (vmcore != NULL) {
				add_arg(&args, "-ex");
				if (asprintf(&s, "target vmcore %s", vmcore) < 0)
				err(1, "couldn't build command line");
				add_arg(&args, s);
				}

				/* Open the remote target if requested. */
				if (remote != NULL) {
				add_arg(&args, "-ex");
				if (asprintf(&s, "target remote %s", remote) < 0)
				err(1, "couldn't build command line");
				add_arg(&args, s);
				}

				add_arg(&args, kernel);

				/* The libgdb code uses optind too. Reset it... */
				optind = 0;

				/* Terminate argv list. */
				add_arg(&args, NULL);

				return (gdb_main(&args));
				}