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head/devel/gdb/files/kgdb/kgdb-main.c
Property | Old Value | New Value |
---|---|---|
svn:eol-style | null | native \ No newline at end of property |
svn:keywords | null | FreeBSD=%H \ No newline at end of property |
svn:mime-type | null | text/plain \ No newline at end of property |
/* | |||||
* 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("$FreeBSD$"); | |||||
#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 line[PATH_MAX], path[PATH_MAX]; | |||||
FILE *info; | |||||
char *dir; | |||||
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 either kernel.full or 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(line, sizeof(line), info) != NULL) { | |||||
l = strlen(line); | |||||
if (l > 0 && line[l - 1] == '\n') | |||||
line[--l] = '\0'; | |||||
if (strncmp(line, " ", 4) == 0) { | |||||
fclose(info); | |||||
dir = strchr(line, ':'); | |||||
dir = (dir == NULL) ? line + 4 : dir + 1; | |||||
/* | |||||
* Check for kernel.full first as if it exists | |||||
* kernel.debug will also exist, but will only | |||||
* contain debug symbols and not be recognized | |||||
* as a valid kernel by the osabi sniffer. | |||||
*/ | |||||
snprintf(path, sizeof(path), "%s/kernel.full", dir); | |||||
if (stat(path, &st) == 0 && S_ISREG(st.st_mode)) { | |||||
kernel = strdup(path); | |||||
return; | |||||
} | |||||
snprintf(path, sizeof(path), "%s/kernel.debug", dir); | |||||
if (stat(path, &st) == 0 && S_ISREG(st.st_mode)) { | |||||
kernel = strdup(path); | |||||
return; | |||||
} | |||||
snprintf(path, sizeof(path), "%s/kernel", dir); | |||||
if (stat(path, &st) == 0 && S_ISREG(st.st_mode)) { | |||||
kernel = strdup(path); | |||||
return; | |||||
} | |||||
return; | |||||
} | |||||
} | |||||
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)); | |||||
} |