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main.c
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main.c
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/* main.c - core analysis suite
*
* Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
* Copyright (C) 2002-2019 David Anderson
* Copyright (C) 2002-2019 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "defs.h"
#include "xen_hyper_defs.h"
#include <curses.h>
#include <getopt.h>
#include <sys/prctl.h>
static void setup_environment(int, char **);
static int is_external_command(void);
static int is_builtin_command(void);
static int is_input_file(void);
static void check_xen_hyper(void);
static void show_untrusted_files(void);
static void get_osrelease(char *);
static void get_log(char *);
static struct option long_options[] = {
{"memory_module", required_argument, 0, 0},
{"memory_device", required_argument, 0, 0},
{"no_kallsyms", 0, 0, 0},
{"no_modules", 0, 0, 0},
{"help", optional_argument, 0, 'h'},
{"no_data_debug", 0, 0, 0},
{"no_crashrc", 0, 0, 0},
{"no_kmem_cache", 0, 0, 0},
{"kmem_cache_delay", 0, 0, 0},
{"readnow", 0, 0, 0},
{"smp", 0, 0, 0},
{"machdep", required_argument, 0, 0},
{"version", 0, 0, 0},
{"buildinfo", 0, 0, 0},
{"cpus", required_argument, 0, 0},
{"no_ikconfig", 0, 0, 0},
{"hyper", 0, 0, 0},
{"p2m_mfn", required_argument, 0, 0},
{"xen_phys_start", required_argument, 0, 0},
{"zero_excluded", 0, 0, 0},
{"no_panic", 0, 0, 0},
{"more", 0, 0, 0},
{"less", 0, 0, 0},
{"CRASHPAGER", 0, 0, 0},
{"no_scroll", 0, 0, 0},
{"reloc", required_argument, 0, 0},
{"kaslr", required_argument, 0, 0},
{"active", 0, 0, 0},
{"minimal", 0, 0, 0},
{"mod", required_argument, 0, 0},
{"kvmhost", required_argument, 0, 0},
{"kvmio", required_argument, 0, 0},
{"no_elf_notes", 0, 0, 0},
{"osrelease", required_argument, 0, 0},
{"log", required_argument, 0, 0},
{"hex", 0, 0, 0},
{"dec", 0, 0, 0},
{"no_strip", 0, 0, 0},
{"hash", required_argument, 0, 0},
{"offline", required_argument, 0, 0},
{"src", required_argument, 0, 0},
{0, 0, 0, 0}
};
int
main(int argc, char **argv)
{
int i, c, option_index;
char *tmpname;
setup_environment(argc, argv);
/*
* Get and verify command line options.
*/
opterr = 0;
optind = 0;
while((c = getopt_long(argc, argv, "Lkgh::e:i:sSvc:d:tfp:m:xo:",
long_options, &option_index)) != -1) {
switch (c)
{
case 0:
if (STREQ(long_options[option_index].name,
"memory_module"))
pc->memory_module = optarg;
else if (STREQ(long_options[option_index].name,
"memory_device"))
pc->memory_device = optarg;
else if (STREQ(long_options[option_index].name,
"no_kallsyms"))
kt->flags |= NO_KALLSYMS;
else if (STREQ(long_options[option_index].name,
"no_modules"))
kt->flags |= NO_MODULE_ACCESS;
else if (STREQ(long_options[option_index].name,
"no_ikconfig"))
kt->flags |= NO_IKCONFIG;
else if (STREQ(long_options[option_index].name,
"no_data_debug"))
pc->flags &= ~DATADEBUG;
else if (STREQ(long_options[option_index].name,
"no_kmem_cache"))
vt->flags |= KMEM_CACHE_UNAVAIL;
else if (STREQ(long_options[option_index].name,
"kmem_cache_delay"))
vt->flags |= KMEM_CACHE_DELAY;
else if (STREQ(long_options[option_index].name,
"readnow"))
pc->flags |= READNOW;
else if (STREQ(long_options[option_index].name,
"smp"))
kt->flags |= SMP;
else if (STREQ(long_options[option_index].name,
"machdep")) {
for (i = 0; i < MAX_MACHDEP_ARGS; i++) {
if (machdep->cmdline_args[i])
continue;
machdep->cmdline_args[i] = optarg;
break;
}
if (i == MAX_MACHDEP_ARGS)
error(INFO, "option ignored: %s\n",
optarg);
}
else if (STREQ(long_options[option_index].name,
"version")) {
pc->flags |= VERSION_QUERY;
display_version();
display_gdb_banner();
clean_exit(0);
}
else if (STREQ(long_options[option_index].name,
"buildinfo")) {
dump_build_data();
clean_exit(0);
}
else if (STREQ(long_options[option_index].name, "cpus"))
kt->cpus_override = optarg;
else if (STREQ(long_options[option_index].name, "hyper"))
pc->flags |= XEN_HYPER;
else if (STREQ(long_options[option_index].name, "p2m_mfn"))
xen_kdump_p2m_mfn(optarg);
else if (STREQ(long_options[option_index].name, "xen_phys_start"))
set_xen_phys_start(optarg);
else if (STREQ(long_options[option_index].name, "zero_excluded"))
*diskdump_flags |= ZERO_EXCLUDED;
else if (STREQ(long_options[option_index].name, "no_elf_notes")) {
if (machine_type("X86") || machine_type("X86_64"))
*diskdump_flags |= NO_ELF_NOTES;
else
error(INFO,
"--no_elf_notes is only applicable to "
"the X86 and X86_64 architectures.\n");
}
else if (STREQ(long_options[option_index].name, "no_panic"))
tt->flags |= PANIC_TASK_NOT_FOUND;
else if (STREQ(long_options[option_index].name, "no_strip"))
st->flags |= NO_STRIP;
else if (STREQ(long_options[option_index].name, "more")) {
if ((pc->scroll_command != SCROLL_NONE) &&
file_exists("/bin/more", NULL))
pc->scroll_command = SCROLL_MORE;
}
else if (STREQ(long_options[option_index].name, "less")) {
if ((pc->scroll_command != SCROLL_NONE) &&
file_exists("/usr/bin/less", NULL))
pc->scroll_command = SCROLL_LESS;
}
else if (STREQ(long_options[option_index].name, "CRASHPAGER")) {
if ((pc->scroll_command != SCROLL_NONE) &&
CRASHPAGER_valid())
pc->scroll_command = SCROLL_CRASHPAGER;
}
else if (STREQ(long_options[option_index].name, "no_scroll"))
pc->flags &= ~SCROLL;
else if (STREQ(long_options[option_index].name, "no_crashrc"))
pc->flags |= NOCRASHRC;
else if (STREQ(long_options[option_index].name, "active"))
tt->flags |= ACTIVE_ONLY;
else if (STREQ(long_options[option_index].name, "mod"))
kt->module_tree = optarg;
else if (STREQ(long_options[option_index].name, "hash")) {
if (!calculate(optarg, &pc->nr_hash_queues, NULL, 0)) {
error(INFO, "invalid --hash argument: %s\n",
optarg);
}
} else if (STREQ(long_options[option_index].name, "kaslr")) {
if (!machine_type("X86_64") &&
!machine_type("ARM64") && !machine_type("X86") &&
!machine_type("S390X"))
error(INFO, "--kaslr not valid "
"with this machine type.\n");
else if (STREQ(optarg, "auto"))
kt->flags2 |= (RELOC_AUTO|KASLR);
else {
if (!calculate(optarg, &kt->relocate,
NULL, 0)) {
error(INFO,
"invalid --kaslr argument: %s\n",
optarg);
program_usage(SHORT_FORM);
}
kt->relocate *= -1;
kt->flags |= RELOC_SET;
kt->flags2 |= KASLR;
st->_stext_vmlinux = UNINITIALIZED;
}
} else if (STREQ(long_options[option_index].name, "reloc")) {
if (!calculate(optarg, &kt->relocate, NULL, 0)) {
error(INFO, "invalid --reloc argument: %s\n",
optarg);
program_usage(SHORT_FORM);
}
kt->flags |= RELOC_SET;
}
else if (STREQ(long_options[option_index].name, "minimal"))
pc->flags |= MINIMAL_MODE;
else if (STREQ(long_options[option_index].name, "kvmhost"))
set_kvmhost_type(optarg);
else if (STREQ(long_options[option_index].name, "kvmio"))
set_kvm_iohole(optarg);
else if (STREQ(long_options[option_index].name, "osrelease")) {
pc->flags2 |= GET_OSRELEASE;
get_osrelease(optarg);
}
else if (STREQ(long_options[option_index].name, "log")) {
pc->flags2 |= GET_LOG;
get_log(optarg);
}
else if (STREQ(long_options[option_index].name, "hex")) {
pc->flags2 |= RADIX_OVERRIDE;
pc->output_radix = 16;
}
else if (STREQ(long_options[option_index].name, "dec")) {
pc->flags2 |= RADIX_OVERRIDE;
pc->output_radix = 10;
}
else if (STREQ(long_options[option_index].name, "offline")) {
if (STREQ(optarg, "show"))
pc->flags2 &= ~OFFLINE_HIDE;
else if (STREQ(optarg, "hide"))
pc->flags2 |= OFFLINE_HIDE;
else {
error(INFO, "invalid --offline argument: %s\n", optarg);
program_usage(SHORT_FORM);
}
}
else if (STREQ(long_options[option_index].name, "src"))
kt->source_tree = optarg;
else {
error(INFO, "internal error: option %s unhandled\n",
long_options[option_index].name);
program_usage(SHORT_FORM);
}
break;
case 'f':
st->flags |= FORCE_DEBUGINFO;
break;
case 'g':
pc->flags |= KERNEL_DEBUG_QUERY;
break;
case 'h':
/* note: long_getopt's handling of optional arguments is weak.
* To it, an optional argument must be part of the same argument
* as the flag itself (eg. --help=commands or -hcommands).
* We want to accept "--help commands" or "-h commands".
* So we must do that part ourselves.
*/
if (optarg != NULL)
cmd_usage(optarg, COMPLETE_HELP|PIPE_TO_SCROLL|MUST_HELP);
else if (argv[optind] != NULL && argv[optind][0] != '-')
cmd_usage(argv[optind++], COMPLETE_HELP|PIPE_TO_SCROLL|MUST_HELP);
else
program_usage(LONG_FORM);
clean_exit(0);
case 'k':
pc->flags |= KERNTYPES;
break;
case 'e':
if (STREQ(optarg, "vi"))
pc->editing_mode = "vi";
else if (STREQ(optarg, "emacs"))
pc->editing_mode = "emacs";
else
fprintf(fp, "invalid edit mode: %s\n", optarg);
break;
case 't':
kt->flags2 |= GET_TIMESTAMP;
break;
case 'i':
pc->input_file = optarg;
pc->flags |= CMDLINE_IFILE;
break;
case 'v':
pc->flags |= VERSION_QUERY;
display_version();
display_gdb_banner();
clean_exit(0);
case 's':
pc->flags |= SILENT;
pc->flags &= ~SCROLL;
// pc->scroll_command = SCROLL_NONE; (why?)
break;
case 'L':
if (mlockall(MCL_CURRENT|MCL_FUTURE) == -1)
perror("mlockall");
break;
case 'S':
if (is_system_map("/boot/System.map")) {
pc->system_map = "/boot/System.map";
pc->flags |= (SYSMAP|SYSMAP_ARG);
}
break;
case 'c':
create_console_device(optarg);
break;
case 'd':
pc->debug = atol(optarg);
set_lkcd_debug(pc->debug);
set_vas_debug(pc->debug);
break;
case 'p':
force_page_size(optarg);
break;
case 'm':
for (i = 0; i < MAX_MACHDEP_ARGS; i++) {
if (machdep->cmdline_args[i])
continue;
machdep->cmdline_args[i] = optarg;
break;
}
if (i == MAX_MACHDEP_ARGS)
error(INFO, "option ignored: %s\n",
optarg);
break;
case 'x':
pc->flags |= PRELOAD_EXTENSIONS;
break;
case 'o':
ramdump_elf_output_file(optarg);
break;
default:
error(INFO, "invalid option: %s\n",
argv[optind-1]);
program_usage(SHORT_FORM);
}
}
opterr = 1;
display_version();
/*
* Take the kernel and dumpfile arguments in either order.
*/
while (argv[optind]) {
if (is_ramdump(argv[optind])) {
if (pc->flags & MEMORY_SOURCES) {
error(INFO,
"too many dumpfile arguments\n");
program_usage(SHORT_FORM);
}
if (ACTIVE()) {
pc->flags |= LIVE_RAMDUMP;
pc->readmem = read_ramdump;
pc->writemem = NULL;
optind++;
continue;
}
pc->dumpfile = ramdump_to_elf();
if (is_kdump(pc->dumpfile, KDUMP_LOCAL)) {
pc->flags |= KDUMP;
if (is_ramdump_image())
pc->readmem = read_ramdump;
else
pc->readmem = read_kdump;
pc->writemem = NULL;
} else {
error(INFO, "malformed ELF file: %s\n",
pc->dumpfile);
program_usage(SHORT_FORM);
}
optind++;
continue;
}
if (is_remote_daemon(argv[optind])) {
if (pc->flags & DUMPFILE_TYPES) {
error(INFO,
"too many dumpfile/memory arguments\n");
program_usage(SHORT_FORM);
}
pc->flags2 |= REMOTE_DAEMON;
optind++;
continue;
}
if (STREQ(argv[optind], "/dev/crash")) {
pc->memory_device = argv[optind];
optind++;
continue;
}
if (!file_exists(argv[optind], NULL)) {
error(INFO, "%s: %s\n", argv[optind], strerror(ENOENT));
program_usage(SHORT_FORM);
} else if (is_directory(argv[optind])) {
error(INFO, "%s: not a supported file format\n",
argv[optind]);
program_usage(SHORT_FORM);
} else if (!is_readable(argv[optind]))
program_usage(SHORT_FORM);
if (is_kernel(argv[optind])) {
if (pc->namelist || pc->server_namelist) {
if (!select_namelist(argv[optind])) {
error(INFO,
"too many namelist arguments\n");
program_usage(SHORT_FORM);
}
} else
pc->namelist = argv[optind];
} else if (is_compressed_kernel(argv[optind], &tmpname)) {
if (pc->namelist) {
if (!select_namelist(tmpname)) {
error(INFO,
"too many namelist arguments\n");
program_usage(SHORT_FORM);
}
if (pc->namelist_debug == tmpname) {
pc->namelist_debug_orig = argv[optind];
} else {
pc->namelist_debug_orig = pc->namelist_orig;
pc->namelist_orig = argv[optind];
}
} else {
pc->namelist = tmpname;
pc->namelist_orig = argv[optind];
}
pc->cleanup = NULL;
} else if (!(pc->flags & KERNEL_DEBUG_QUERY)) {
if (is_flattened_format(argv[optind]))
pc->flags2 |= FLAT;
if (STREQ(argv[optind], "/dev/mem")) {
if (pc->flags & MEMORY_SOURCES) {
error(INFO,
"too many dumpfile arguments\n");
program_usage(SHORT_FORM);
}
pc->flags |= DEVMEM;
pc->dumpfile = NULL;
pc->readmem = read_dev_mem;
pc->writemem = write_dev_mem;
pc->live_memsrc = argv[optind];
} else if (is_proc_kcore(argv[optind], KCORE_LOCAL)) {
if (pc->flags & MEMORY_SOURCES) {
error(INFO,
"too many dumpfile arguments\n");
program_usage(SHORT_FORM);
}
pc->flags |= PROC_KCORE;
pc->dumpfile = NULL;
pc->readmem = read_proc_kcore;
pc->writemem = write_proc_kcore;
pc->live_memsrc = argv[optind];
} else if (is_netdump(argv[optind], NETDUMP_LOCAL)) {
if (pc->flags & MEMORY_SOURCES) {
error(INFO,
"too many dumpfile arguments\n");
program_usage(SHORT_FORM);
}
pc->flags |= NETDUMP;
pc->dumpfile = argv[optind];
if (is_sadump_xen()) {
pc->readmem = read_kdump;
pc->writemem = write_kdump;
} else {
pc->readmem = read_netdump;
pc->writemem = write_netdump;
}
} else if (is_kdump(argv[optind], KDUMP_LOCAL)) {
if (pc->flags & MEMORY_SOURCES) {
error(INFO,
"too many dumpfile arguments\n");
program_usage(SHORT_FORM);
}
pc->flags |= KDUMP;
pc->dumpfile = argv[optind];
pc->readmem = read_kdump;
pc->writemem = write_kdump;
} else if (is_kvmdump(argv[optind])) {
if (pc->flags & MEMORY_SOURCES) {
error(INFO,
"too many dumpfile arguments\n");
program_usage(SHORT_FORM);
}
pc->flags |= KVMDUMP;
pc->dumpfile = argv[optind];
pc->readmem = read_kvmdump;
pc->writemem = write_kvmdump;
} else if (is_kvmdump_mapfile(argv[optind])) {
if (pc->kvmdump_mapfile) {
error(INFO,
"too many KVM map file arguments\n");
program_usage(SHORT_FORM);
}
pc->kvmdump_mapfile = argv[optind];
} else if (is_xendump(argv[optind])) {
if (pc->flags & MEMORY_SOURCES) {
error(INFO,
"too many dumpfile arguments\n");
program_usage(SHORT_FORM);
}
pc->flags |= XENDUMP;
pc->dumpfile = argv[optind];
pc->readmem = read_xendump;
pc->writemem = write_xendump;
} else if (is_system_map(argv[optind])) {
pc->system_map = argv[optind];
pc->flags |= (SYSMAP|SYSMAP_ARG);
} else if (is_diskdump(argv[optind])) {
if ((pc->flags & MEMORY_SOURCES) &&
(!dumpfile_is_split())) {
error(INFO,
"too many dumpfile arguments\n");
program_usage(SHORT_FORM);
}
pc->flags |= DISKDUMP;
pc->dumpfile = argv[optind];
pc->readmem = read_diskdump;
pc->writemem = write_diskdump;
} else if (is_lkcd_compressed_dump(argv[optind])) {
if (pc->flags & MEMORY_SOURCES) {
error(INFO,
"too many dumpfile arguments\n");
program_usage(SHORT_FORM);
}
pc->flags |= LKCD;
pc->dumpfile = argv[optind];
pc->readmem = read_lkcd_dumpfile;
pc->writemem = write_lkcd_dumpfile;
} else if (is_mclx_compressed_dump(argv[optind])) {
if (pc->flags & MEMORY_SOURCES) {
error(INFO,
"too many dumpfile arguments\n");
program_usage(SHORT_FORM);
}
pc->flags |= MCLXCD;
pc->dumpfile = argv[optind];
pc->readmem = read_mclx_dumpfile;
pc->writemem = write_mclx_dumpfile;
} else if (is_s390_dump(argv[optind])) {
if (pc->flags & MEMORY_SOURCES) {
error(INFO,
"too many dumpfile arguments\n");
program_usage(SHORT_FORM);
}
pc->flags |= S390D;
pc->dumpfile = argv[optind];
pc->readmem = read_s390_dumpfile;
pc->writemem = write_s390_dumpfile;
} else if (is_sadump(argv[optind])) {
if ((pc->flags & MEMORY_SOURCES) &&
!sadump_is_diskset()) {
error(INFO,
"too many dumpfile arguments\n");
program_usage(SHORT_FORM);
}
pc->flags |= SADUMP;
pc->dumpfile = argv[optind];
pc->readmem = read_sadump;
pc->writemem = write_sadump;
} else if (is_vmware_vmss(argv[optind])) {
if (pc->flags & MEMORY_SOURCES) {
error(INFO,
"too many dumpfile arguments\n");
program_usage(SHORT_FORM);
}
pc->flags |= VMWARE_VMSS;
pc->dumpfile = argv[optind];
pc->readmem = read_vmware_vmss;
pc->writemem = write_vmware_vmss;
} else if (is_vmware_guestdump(argv[optind])) {
if (pc->flags & MEMORY_SOURCES) {
error(INFO,
"too many dumpfile arguments\n");
program_usage(SHORT_FORM);
}
pc->flags |= VMWARE_VMSS;
pc->flags2 |= VMWARE_VMSS_GUESTDUMP;
pc->dumpfile = argv[optind];
pc->readmem = read_vmware_vmss;
pc->writemem = write_vmware_vmss;
} else {
error(INFO,
"%s: not a supported file format\n",
argv[optind]);
program_usage(SHORT_FORM);
}
}
optind++;
}
check_xen_hyper();
if (setjmp(pc->main_loop_env))
clean_exit(1);
/*
* Initialize various subsystems.
*/
fd_init();
buf_init();
cmdline_init();
mem_init();
hq_init();
machdep_init(PRE_SYMTAB);
symtab_init();
paravirt_init();
machdep_init(PRE_GDB);
datatype_init();
/*
* gdb_main_loop() modifies "command_loop_hook" to point to the
* main_loop() function below, and then calls gdb's main() function.
* After gdb initializes itself, it calls back to main_loop().
*/
gdb_main_loop(argc, argv);
clean_exit(0);
exit(0);
}
/*
* This routine is called from above, but also will be re-entered
* as part of gdb's SIGINT handling. Since GDB_INIT and RUNTIME
* will be set on re-entrancy, the initialization routines won't
* be called. This can be avoided by always making gdb ignore SIGINT.
*/
void
main_loop(void)
{
if (pc->flags2 & ERASEINFO_DATA)
error(WARNING, "\n%s:\n "
"Kernel data has been erased from this dumpfile. This may "
"cause\n the crash session to fail entirely, may "
"cause commands to fail,\n or may result in "
"unpredictable\n runtime behavior.\n",
pc->dumpfile);
if (pc->flags2 & INCOMPLETE_DUMP) {
error(WARNING, "\n%s:\n "
"This dumpfile is incomplete. This may cause the crash session"
"\n to fail entirely, may cause commands to fail, or may"
" result in\n unpredictable runtime behavior.\n",
pc->dumpfile);
if (!(*diskdump_flags & ZERO_EXCLUDED))
fprintf(fp,
" NOTE: This dumpfile may be analyzed with the --zero_excluded command\n"
" line option, in which case any read requests from missing pages\n"
" will return zero-filled memory.\n");
}
if (pc->flags2 & EXCLUDED_VMEMMAP) {
error(WARNING, "\n%s:\n "
"This dumpfile is incomplete because the page structures associated\n"
" with excluded pages may also be excluded. This may cause the crash\n"
" session to fail entirely, may cause commands to fail (most notably\n"
" the \"kmem\" command), or may result in unpredictable runtime behavior.\n",
pc->dumpfile);
}
if (!(pc->flags & GDB_INIT)) {
gdb_session_init();
machdep_init(POST_RELOC);
show_untrusted_files();
kdump_backup_region_init();
if (XEN_HYPER_MODE()) {
#ifdef XEN_HYPERVISOR_ARCH
machdep_init(POST_GDB);
xen_hyper_init();
machdep_init(POST_INIT);
#else
error(FATAL, XEN_HYPERVISOR_NOT_SUPPORTED);
#endif
} else if (!(pc->flags & MINIMAL_MODE)) {
read_in_kernel_config(IKCFG_INIT);
kernel_init();
machdep_init(POST_GDB);
vm_init();
machdep_init(POST_VM);
module_init();
help_init();
task_init();
vfs_init();
net_init();
dev_init();
machdep_init(POST_INIT);
}
} else
SIGACTION(SIGINT, restart, &pc->sigaction, NULL);
/*
* Display system statistics and current context.
*/
if (!(pc->flags & SILENT) && !(pc->flags & RUNTIME)) {
if (XEN_HYPER_MODE()) {
#ifdef XEN_HYPERVISOR_ARCH
xen_hyper_display_sys_stats();
xen_hyper_show_vcpu_context(XEN_HYPER_VCPU_LAST_CONTEXT());
fprintf(fp, "\n");
#else
error(FATAL, XEN_HYPERVISOR_NOT_SUPPORTED);
#endif
} else if (!(pc->flags & MINIMAL_MODE)) {
display_sys_stats();
show_context(CURRENT_CONTEXT());
fprintf(fp, "\n");
}
}
if (pc->flags & MINIMAL_MODE)
error(NOTE,
"minimal mode commands: log, dis, rd, sym, eval, set, extend and exit\n\n");
pc->flags |= RUNTIME;
if (pc->flags & PRELOAD_EXTENSIONS)
preload_extensions();
/*
* Return here if a non-recoverable error occurs
* during command execution.
*/
if (setjmp(pc->main_loop_env)) {
;
}
/*
* process_command_line() reads, parses and stores input command lines
* in the global args[] array. exec_command() figures out what to
* do with the parsed line.
*/
while (TRUE) {
process_command_line();
exec_command();
}
}
/*
* Most of the time args[0] simply contains the name string of a command
* found in the global command_table[]. Special consideration is done for
* dealing with input files, "known" external commands, and built-in commands.
* If none of the above apply, the args[0] string is checked against the
* known list of structure, union and typedef names, and if found, passed
* on to cmd_struct(), cmd_union() or cmd_whatis().
*/
void
exec_command(void)
{
struct command_table_entry *ct;
struct args_input_file args_ifile;
if (args[0] && (args[0][0] == '\\') && args[0][1]) {
shift_string_left(args[0], 1);
shift_string_left(pc->orig_line, 1);
pc->curcmd_flags |= NO_MODIFY;
}
reattempt:
if (!args[0])
return;
optind = argerrs = 0;
if ((ct = get_command_table_entry(args[0]))) {
if (ct->flags & REFRESH_TASK_TABLE) {
if (XEN_HYPER_MODE()) {
#ifdef XEN_HYPERVISOR_ARCH
xen_hyper_refresh_domain_context_space();
xen_hyper_refresh_vcpu_context_space();
#else
error(FATAL, XEN_HYPERVISOR_NOT_SUPPORTED);
#endif
} else if (!(pc->flags & MINIMAL_MODE)) {
tt->refresh_task_table();
sort_context_array();
sort_tgid_array();
}
}
if (!STREQ(pc->curcmd, pc->program_name))
pc->lastcmd = pc->curcmd;
pc->curcmd = ct->name;
pc->cmdgencur++;
if (is_args_input_file(ct, &args_ifile))
exec_args_input_file(ct, &args_ifile);
else
(*ct->func)();
pc->lastcmd = pc->curcmd;
pc->curcmd = pc->program_name;
return;
}
if (is_input_file())
return;
if (is_external_command())
return;
if (is_builtin_command())
return;
if (is_datatype_command())
goto reattempt;
if (STRNEQ(args[0], "#") || STRNEQ(args[0], "//"))
return;
if (!(pc->flags & MINIMAL_MODE) &&
is_gdb_command(TRUE, FAULT_ON_ERROR))
goto reattempt;
if (REMOTE() && remote_execute())
return;
pc->curcmd = pc->program_name;
if (pc->flags & MINIMAL_MODE)
error(INFO,
"%s: command not available in minimal mode\n"
"NOTE: minimal mode commands: log, dis, rd, sym, eval, set, extend and exit\n",
args[0]);
else
error(INFO, "command not found: %s\n", args[0]);
if (pc->curcmd_flags & REPEAT)
pc->curcmd_flags &= ~REPEAT;
}
/*
* Find the command_table structure associated with a command name.
*/
struct command_table_entry *
get_command_table_entry(char *name)
{
int i;
struct command_table_entry *cp;
struct extension_table *ext;
if (pc->flags2 & GDB_CMD_MODE) {
if (STREQ(name, "crash")) {
if (argcnt == 1)
error(FATAL,
"a crash command must follow "
"the \"crash\" directive\n");
for (i = 1; i <= argcnt; i++)
args[i-1] = args[i];
argcnt--;
name = args[0];
} else
name = "gdb";
}
for (cp = pc->cmd_table; cp->name; cp++) {
if (STREQ(cp->name, name)) {
if (!(pc->flags & MINIMAL_MODE) || (cp->flags & MINIMAL))
return cp;
else
return NULL;
}
}
for (ext = extension_table; ext; ext = ext->next) {
for (cp = ext->command_table; cp->name; cp++) {
if (STREQ(cp->name, name)) {
if (!(pc->flags & MINIMAL_MODE) || (cp->flags & MINIMAL))
return cp;
else
return NULL;
}
}
}
return NULL;
}
static int
is_input_file(void)
{
if (STREQ(args[0], "<")) {
exec_input_file();
return TRUE;
}
return FALSE;
}
static int
is_builtin_command(void)
{
int i;
struct remote_file remote_file, *rfp;