8015e78d5d
in future calls, so we can't free it here. The right place to free the buffer would be to be after kvm_close(), but we don't do that yet. A static buffer would work too. Reviewed by: marcel (who has other plans for this anyway) Approved by: re
431 lines
10 KiB
C
431 lines
10 KiB
C
/*
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* Copyright (c) 2004 Marcel Moolenaar
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* 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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*
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/resource.h>
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#include <sys/select.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <err.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <kvm.h>
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#include <limits.h>
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#include <paths.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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/* libgdb stuff. */
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#include <defs.h>
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#include <frame.h>
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#include <inferior.h>
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#include <interps.h>
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#include <cli-out.h>
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#include <main.h>
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#include <target.h>
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#include <top.h>
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#include <bfd.h>
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#include <gdbcore.h>
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extern void (*init_ui_hook)(char *);
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extern void symbol_file_add_main (char *args, int from_tty);
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#include "kgdb.h"
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kvm_t *kvm;
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static int dumpnr;
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static int verbose;
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static char crashdir[PATH_MAX];
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static char *kernel;
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static char *remote;
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static char *vmcore;
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static void (*kgdb_new_objfile_chain)(struct objfile * objfile);
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static void
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usage(void)
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{
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fprintf(stderr,
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"usage: %s [-afqv] [-d crashdir] [-c core | -n dumpnr | -r device]\n"
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"\t[kernel [core]]\n", getprogname());
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exit(1);
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}
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static void
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kernel_from_dumpnr(int nr)
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{
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char path[PATH_MAX];
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FILE *info;
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char *s;
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struct stat st;
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int l;
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/*
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* If there's a kernel image right here in the crash directory, then
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* use it. The kernel image is either called kernel.<nr> or is in a
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* subdirectory kernel.<nr> and called kernel. The latter allows us
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* to collect the modules in the same place.
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*/
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snprintf(path, sizeof(path), "%s/kernel.%d", crashdir, nr);
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if (stat(path, &st) == 0) {
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if (S_ISREG(st.st_mode)) {
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kernel = strdup(path);
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return;
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}
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if (S_ISDIR(st.st_mode)) {
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snprintf(path, sizeof(path), "%s/kernel.%d/kernel",
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crashdir, nr);
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if (stat(path, &st) == 0 && S_ISREG(st.st_mode)) {
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kernel = strdup(path);
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return;
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}
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}
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}
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/*
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* No kernel image here. Parse the dump header. The kernel object
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* directory can be found there and we probably have the kernel
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* image still in it. The object directory may also have a kernel
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* with debugging info (called kernel.debug). If we have a debug
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* kernel, use it.
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*/
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snprintf(path, sizeof(path), "%s/info.%d", crashdir, nr);
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info = fopen(path, "r");
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if (info == NULL) {
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warn(path);
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return;
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}
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while (fgets(path, sizeof(path), info) != NULL) {
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l = strlen(path);
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if (l > 0 && path[l - 1] == '\n')
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path[--l] = '\0';
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if (strncmp(path, " ", 4) == 0) {
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s = strchr(path, ':');
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s = (s == NULL) ? path + 4 : s + 1;
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l = snprintf(path, sizeof(path), "%s/kernel.debug", s);
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if (stat(path, &st) == -1 || !S_ISREG(st.st_mode)) {
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path[l - 6] = '\0';
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if (stat(path, &st) == -1 ||
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!S_ISREG(st.st_mode))
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break;
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}
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kernel = strdup(path);
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break;
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}
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}
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fclose(info);
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}
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static void
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kgdb_new_objfile(struct objfile *objfile)
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{
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#if 0
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printf("XXX: %s(%p)\n", __func__, objfile);
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if (objfile != NULL) {
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goto out;
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}
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out:
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#endif
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if (kgdb_new_objfile_chain != NULL)
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kgdb_new_objfile_chain(objfile);
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}
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static void
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kgdb_init_target(void)
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{
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bfd *kern_bfd;
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int kern_desc;
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kern_desc = open(kernel, O_RDONLY);
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if (kern_desc == -1)
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errx(1, "couldn't open a kernel image");
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kern_bfd = bfd_fdopenr(kernel, gnutarget, kern_desc);
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if (kern_bfd == NULL) {
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close(kern_desc);
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errx(1, "\"%s\": can't open to probe ABI: %s.", kernel,
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bfd_errmsg (bfd_get_error ()));
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}
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bfd_set_cacheable(kern_bfd, 1);
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if (!bfd_check_format (kern_bfd, bfd_object)) {
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bfd_close(kern_bfd);
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errx(1, "\"%s\": not in executable format: %s", kernel,
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bfd_errmsg(bfd_get_error()));
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}
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set_gdbarch_from_file (kern_bfd);
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bfd_close(kern_bfd);
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symbol_file_add_main (kernel, 0);
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if (remote)
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push_remote_target (remote, 0);
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else
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kgdb_target();
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}
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static void
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kgdb_interp_command_loop(void *data)
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{
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static int once = 0;
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if (!once) {
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once = 1;
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kgdb_init_target();
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kgdb_target();
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print_stack_frame (get_selected_frame (),
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frame_relative_level (get_selected_frame ()), 1);
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}
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command_loop();
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}
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static void
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kgdb_init(char *argv0 __unused)
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{
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static struct interp_procs procs = {
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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kgdb_interp_command_loop
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};
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struct interp *kgdb;
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kgdb = interp_new("kgdb", NULL, cli_out_new(gdb_stdout), &procs);
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interp_add(kgdb);
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set_prompt("(kgdb) ");
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kgdb_new_objfile_chain = target_new_objfile_hook;
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target_new_objfile_hook = kgdb_new_objfile;
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}
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int
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main(int argc, char *argv[])
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{
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char path[PATH_MAX];
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struct stat st;
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struct captured_main_args args;
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char *s;
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int a, ch, quiet;
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dumpnr = -1;
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strlcpy(crashdir, "/var/crash", sizeof(crashdir));
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s = getenv("KGDB_CRASH_DIR");
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if (s != NULL)
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strlcpy(crashdir, s, sizeof(crashdir));
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/* Convert long options into short options. */
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for (a = 1; a < argc; a++) {
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s = argv[a];
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if (s[0] == '-') {
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s++;
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/* Long options take either 1 or 2 dashes. */
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if (s[0] == '-')
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s++;
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if (strcmp(s, "quiet") == 0)
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argv[a] = "-q";
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else if (strcmp(s, "fullname") == 0)
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argv[a] = "-f";
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}
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}
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quiet = 0;
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while ((ch = getopt(argc, argv, "ac:d:fn:qr:v")) != -1) {
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switch (ch) {
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case 'a':
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annotation_level++;
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break;
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case 'c': /* use given core file. */
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if (vmcore != NULL) {
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warnx("option %c: can only be specified once",
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optopt);
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usage();
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/* NOTREACHED */
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}
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vmcore = strdup(optarg);
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break;
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case 'd': /* lookup dumps in given directory. */
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strlcpy(crashdir, optarg, sizeof(crashdir));
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break;
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case 'f':
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annotation_level = 1;
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break;
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case 'n': /* use dump with given number. */
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dumpnr = strtol(optarg, &s, 0);
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if (dumpnr < 0 || *s != '\0') {
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warnx("option %c: invalid kernel dump number",
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optopt);
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usage();
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/* NOTREACHED */
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}
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break;
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case 'q':
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quiet = 1;
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break;
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case 'r': /* use given device for remote session. */
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if (remote != NULL) {
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warnx("option %c: can only be specified once",
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optopt);
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usage();
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/* NOTREACHED */
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}
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remote = strdup(optarg);
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break;
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case 'v': /* increase verbosity. */
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verbose++;
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break;
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case '?':
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default:
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usage();
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}
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}
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if (((vmcore != NULL) ? 1 : 0) + ((dumpnr >= 0) ? 1 : 0) +
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((remote != NULL) ? 1 : 0) > 1) {
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warnx("options -c, -n and -r are mutually exclusive");
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usage();
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/* NOTREACHED */
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}
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if (verbose > 1)
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warnx("using %s as the crash directory", crashdir);
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if (argc > optind)
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kernel = strdup(argv[optind++]);
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if (argc > optind && (dumpnr >= 0 || remote != NULL)) {
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warnx("options -n and -r do not take a core file. Ignored");
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optind = argc;
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}
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if (dumpnr >= 0) {
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snprintf(path, sizeof(path), "%s/vmcore.%d", crashdir, dumpnr);
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if (stat(path, &st) == -1)
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err(1, path);
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if (!S_ISREG(st.st_mode))
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errx(1, "%s: not a regular file", path);
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vmcore = strdup(path);
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} else if (remote != NULL && remote[0] != ':' && remote[0] != '|') {
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if (stat(remote, &st) != 0) {
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snprintf(path, sizeof(path), "/dev/%s", remote);
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if (stat(path, &st) != 0) {
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err(1, "%s", remote);
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/* NOTREACHED */
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}
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free(remote);
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remote = strdup(path);
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}
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if (!S_ISCHR(st.st_mode) && !S_ISFIFO(st.st_mode)) {
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errx(1, "%s: not a special file, FIFO or socket",
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remote);
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/* NOTREACHED */
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}
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} else if (argc > optind) {
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if (vmcore == NULL)
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vmcore = strdup(argv[optind++]);
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if (argc > optind)
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warnx("multiple core files specified. Ignored");
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} else if (vmcore == NULL && kernel == NULL) {
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vmcore = strdup(_PATH_MEM);
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kernel = strdup(getbootfile());
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}
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if (verbose) {
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if (vmcore != NULL)
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warnx("core file: %s", vmcore);
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if (remote != NULL)
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warnx("device file: %s", remote);
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if (kernel != NULL)
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warnx("kernel image: %s", kernel);
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}
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/*
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* At this point we must either have a core file or have a kernel
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* with a remote target.
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*/
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if (remote != NULL && kernel == NULL) {
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warnx("remote debugging requires a kernel");
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usage();
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/* NOTREACHED */
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}
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if (vmcore == NULL && remote == NULL) {
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warnx("need a core file or a device for remote debugging");
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usage();
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/* NOTREACHED */
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}
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/* If we don't have a kernel image yet, try to find one. */
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if (kernel == NULL) {
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if (dumpnr >= 0)
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kernel_from_dumpnr(dumpnr);
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if (kernel == NULL)
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errx(1, "couldn't find a suitable kernel image");
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if (verbose)
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warnx("kernel image: %s", kernel);
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}
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if (remote == NULL) {
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s = malloc(_POSIX2_LINE_MAX);
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kvm = kvm_openfiles(kernel, vmcore, NULL, O_RDONLY, s);
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if (kvm == NULL)
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errx(1, s);
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kgdb_thr_init();
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}
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/* The libgdb code uses optind too. Reset it... */
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optind = 0;
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memset (&args, 0, sizeof args);
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args.argv = argv;
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args.argc = 1 + quiet;
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if (quiet)
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argv[1] = "-q";
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argv[args.argc] = NULL;
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args.use_windows = 0;
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args.interpreter_p = "kgdb";
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init_ui_hook = kgdb_init;
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return (gdb_main(&args));
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}
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