/* $NetBSD: db_command.c,v 1.190 2023/11/02 10:31:55 martin Exp $ */

/* $NetBSD: db_command.c,v 1.190 2023/11/02 10:31:55 martin Exp $ */

/*
* Copyright (c) 1996, 1997, 1998, 1999, 2002, 2009, 2019
* The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Adam Hamsik, and by Andrew Doran.
*
* 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/

/*
* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or [email protected]
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/

/*
* Command dispatcher.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: db_command.c,v 1.190 2023/11/02 10:31:55 martin Exp $");

#ifdef _KERNEL_OPT
#include "opt_aio.h"
#include "opt_ddb.h"
#include "opt_fdt.h"
#include "opt_kgdb.h"
#include "opt_mqueue.h"
#include "opt_inet.h"
#include "opt_kernhist.h"
#include "opt_ddbparam.h"
#include "opt_multiprocessor.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/reboot.h>
#include <sys/device.h>
#include <sys/eventvar.h>
#include <sys/lwp.h>
#include <sys/mbuf.h>
#include <sys/namei.h>
#include <sys/pool.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/vmem.h>
#include <sys/lockdebug.h>
#include <sys/cpu.h>
#include <sys/buf.h>
#include <sys/module.h>
#include <sys/kernhist.h>
#include <sys/socketvar.h>
#include <sys/queue.h>
#include <sys/syncobj.h>

#include <dev/cons.h>

#include <ddb/ddb.h>

#include <uvm/uvm_extern.h>
#include <uvm/uvm_ddb.h>

#include <net/route.h>

#ifdef FDT
#include <dev/fdt/fdtvar.h>
#include <dev/fdt/fdt_ddb.h>
#endif

/*
* Results of command search.
*/
#define CMD_EXACT 0
#define CMD_PREFIX 1
#define CMD_NONE 2
#define CMD_AMBIGUOUS 3

/*
* Exported global variables
*/
bool db_cmd_loop_done;
label_t *db_recover;
db_addr_t db_dot;
db_addr_t db_last_addr;
db_addr_t db_prev;
db_addr_t db_next;

/*
* New DDB api for adding and removing commands uses three lists, because
* we use two types of commands
* a) standard commands without subcommands -> reboot
* b) show commands which are subcommands of show command -> show aio_jobs
* c) if defined machine specific commands
*
* ddb_add_cmd, ddb_rem_cmd use type (DDB_SHOW_CMD||DDB_BASE_CMD)argument to
* add them to representativ lists.
*/

static const struct db_command db_command_table[];
static const struct db_command db_show_cmds[];

#ifdef DB_MACHINE_COMMANDS
/* arch/<arch>/<arch>/db_interface.c */
extern const struct db_command db_machine_command_table[];
#endif

/* the global queue of all command tables */
TAILQ_HEAD(db_cmd_tbl_en_head, db_cmd_tbl_en);

/* TAILQ entry used to register command tables */
struct db_cmd_tbl_en {
const struct db_command *db_cmd; /* cmd table */
TAILQ_ENTRY(db_cmd_tbl_en) db_cmd_next;
};

/* head of base commands list */
static struct db_cmd_tbl_en_head db_base_cmd_list =
TAILQ_HEAD_INITIALIZER(db_base_cmd_list);
static struct db_cmd_tbl_en db_base_cmd_builtins =
{ .db_cmd = db_command_table };

/* head of show commands list */
static struct db_cmd_tbl_en_head db_show_cmd_list =
TAILQ_HEAD_INITIALIZER(db_show_cmd_list);
static struct db_cmd_tbl_en db_show_cmd_builtins =
{ .db_cmd = db_show_cmds };

/* head of machine commands list */
static struct db_cmd_tbl_en_head db_mach_cmd_list =
TAILQ_HEAD_INITIALIZER(db_mach_cmd_list);
#ifdef DB_MACHINE_COMMANDS
static struct db_cmd_tbl_en db_mach_cmd_builtins =
{ .db_cmd = db_machine_command_table };
#endif

/*
* if 'ed' style: 'dot' is set at start of last item printed,
* and '+' points to next line.
* Otherwise: 'dot' points to next item, '..' points to last.
*/
static bool db_ed_style = true;

static void db_init_commands(void);
static int db_register_tbl_entry(uint8_t type,
struct db_cmd_tbl_en *list_ent);
static void db_cmd_list(const struct db_cmd_tbl_en_head *);
static int db_cmd_search(const char *, struct db_cmd_tbl_en_head *,
const struct db_command **);
static int db_cmd_search_table(const char *, const struct db_command *,
const struct db_command **);
static void db_cmd_search_failed(char *, int);
static const struct db_command *db_read_command(void);
static void db_command(const struct db_command **);
static void db_buf_print_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_event_print_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_fncall(db_expr_t, bool, db_expr_t, const char *);
static void db_help_print_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_lock_print_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_show_all_locks(db_expr_t, bool, db_expr_t, const char *);
static void db_show_all_tstiles(db_expr_t, bool, db_expr_t, const char *);
static void db_show_lockstats(db_expr_t, bool, db_expr_t, const char *);
static void db_show_all_freelists(db_expr_t, bool, db_expr_t, const char *);
static void db_mount_print_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_show_all_mounts(db_expr_t, bool, db_expr_t, const char *);
static void db_mbuf_print_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_kqueue_print_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_map_print_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_namecache_print_cmd(db_expr_t, bool, db_expr_t,
const char *);
static void db_object_print_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_page_print_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_show_all_pages(db_expr_t, bool, db_expr_t, const char *);
static void db_pool_print_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_reboot_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_sifting_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_socket_print_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_stack_trace_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_sync_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_whatis_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_uvmexp_print_cmd(db_expr_t, bool, db_expr_t, const char *);
#ifdef KERNHIST
static void db_kernhist_print_cmd(db_expr_t, bool, db_expr_t, const char *);
#endif
static void db_vnode_print_cmd(db_expr_t, bool, db_expr_t, const char *);
static void db_vnode_lock_print_cmd(db_expr_t, bool, db_expr_t,
const char *);
static void db_vmem_print_cmd(db_expr_t, bool, db_expr_t, const char *);
#ifdef FDT
static void db_fdt_print_cmd(db_expr_t, bool, db_expr_t, const char *);
#endif

static const struct db_command db_show_cmds[] = {
{ DDB_ADD_CMD("all", NULL,
CS_COMPAT, NULL,NULL,NULL) },
#ifdef AIO
{ DDB_ADD_CMD("aio_jobs", db_show_aio_jobs, 0,
"Show aio jobs",NULL,NULL) },
#endif
#ifdef _KERNEL
{ DDB_ADD_CMD("breaks", db_listbreak_cmd, 0,
"Display all breaks.",NULL,NULL) },
#endif
{ DDB_ADD_CMD("buf", db_buf_print_cmd, 0,
"Print the struct buf at address.", "[/f] address",NULL) },
/* added from all sub cmds */
{ DDB_ADD_CMD("callout", db_show_callout,
0 ,"List all used callout functions.",NULL,NULL) },
{ DDB_ADD_CMD("condvar", db_show_condvar,
0 ,"Show the contents of a condition variable.",NULL,NULL) },
{ DDB_ADD_CMD("devices", db_show_all_devices, 0,NULL,NULL,NULL) },
{ DDB_ADD_CMD("event", db_event_print_cmd, 0,
"Print all the non-zero evcnt(9) event counters.", "[/fitm]",NULL) },
#ifdef FDT
{ DDB_ADD_CMD("fdt", db_fdt_print_cmd, 0,
"Show FDT information", NULL, NULL) },
#endif
{ DDB_ADD_CMD("files", db_show_files_cmd, 0,
"Print the files open by process at address",
"[/f] address", NULL) },
{ DDB_ADD_CMD("freelists", db_show_all_freelists,
0 ,"Show all freelists", NULL, NULL) },
#ifdef KERNHIST
{ DDB_ADD_CMD("kernhist", db_kernhist_print_cmd, 0,
"Print the UVM history logs.",
NULL,NULL) },
#endif
/* added from all sub cmds */
{ DDB_ADD_CMD("locks", db_show_all_locks,
0 ,"Show all held locks", "[/t]", NULL) },
{ DDB_ADD_CMD("lock", db_lock_print_cmd, 0,NULL,NULL,NULL) },
{ DDB_ADD_CMD("lockstats",
db_show_lockstats, 0,
"Print statistics of locks", NULL, NULL) },
{ DDB_ADD_CMD("kqueue", db_kqueue_print_cmd, 0,
"Print the kqueue at address.", "[/f] address",NULL) },
{ DDB_ADD_CMD("map", db_map_print_cmd, 0,
"Print the vm_map at address.", "[/f] address",NULL) },
{ DDB_ADD_CMD("mbuf", db_mbuf_print_cmd, 0,NULL,NULL,
"-c prints all mbuf chains") },
{ DDB_ADD_CMD("module", db_show_module_cmd, 0,
"Print kernel modules", NULL, NULL) },
{ DDB_ADD_CMD("mount", db_mount_print_cmd, 0,
"Print the mount structure at address.", "[/f] address",NULL) },
{ DDB_ADD_CMD("mounts", db_show_all_mounts, 0,
"Print all mount structures.", "[/f]", NULL) },
#ifdef MQUEUE
{ DDB_ADD_CMD("mqueue", db_show_mqueue_cmd, 0,
"Print the message queues", NULL, NULL) },
#endif
{ DDB_ADD_CMD("ncache", db_namecache_print_cmd, 0,
"Dump the namecache list.", "address",NULL) },
{ DDB_ADD_CMD("object", db_object_print_cmd, 0,
"Print the vm_object at address.", "[/f] address",NULL) },
{ DDB_ADD_CMD("page", db_page_print_cmd, 0,
"Print the vm_page at address.", "[/f] address",NULL) },
{ DDB_ADD_CMD("pages", db_show_all_pages,
0 ,"List all used memory pages.",NULL,NULL) },
{ DDB_ADD_CMD("panic", db_show_panic, 0,
"Print the current panic string",NULL,NULL) },
{ DDB_ADD_CMD("pool", db_pool_print_cmd, 0,
"Print the pool at address.", "[/clp] address",NULL) },
/* added from all sub cmds */
{ DDB_ADD_CMD("pools", db_show_all_pools,
0 ,"Show all pools",NULL,NULL) },
{ DDB_ADD_CMD("proc", db_show_proc,
0 ,"Print process information.",NULL,NULL) },
/* added from all sub cmds */
{ DDB_ADD_CMD("procs", db_show_all_procs,
0 ,"List all processes.",NULL,NULL) },
{ DDB_ADD_CMD("registers", db_show_regs, 0,
"Display the register set.", "[/u]",NULL) },
#if defined(INET)
{ DDB_ADD_CMD("routes", db_show_routes, 0,NULL,NULL,NULL) },
#endif
{ DDB_ADD_CMD("sched_qs", db_show_sched_qs, 0,
"Print the state of the scheduler's run queues.",
NULL,NULL) },
{ DDB_ADD_CMD("selinfo", db_show_selinfo,
0 ,"Show the contents of a selinfo.",NULL,NULL) },
{ DDB_ADD_CMD("sleepq", db_show_sleepq,
0 ,"Show the contents of a sleep queue.",NULL,NULL) },
{ DDB_ADD_CMD("socket", db_socket_print_cmd, 0,NULL,NULL,NULL) },
{ DDB_ADD_CMD("tstiles", db_show_all_tstiles,
0, "Show who's holding up tstiles", "[/t]", NULL) },
{ DDB_ADD_CMD("uvmexp", db_uvmexp_print_cmd, 0,
"Print a selection of UVM counters and statistics.",
NULL,NULL) },
{ DDB_ADD_CMD("vmem", db_vmem_print_cmd, 0,
"Print the vmem usage.", "address", NULL) },
{ DDB_ADD_CMD("vmems", db_show_all_vmems, 0,
"Show all vmems.", NULL, NULL) },
{ DDB_ADD_CMD("vnode", db_vnode_print_cmd, 0,
"Print the vnode at address.", "[/f] address",NULL) },
{ DDB_ADD_CMD("vnode_lock", db_vnode_lock_print_cmd, 0,
"Print the vnode having that address as v_lock.",
"[/f] address",NULL) },
#ifdef _KERNEL
{ DDB_ADD_CMD("watches", db_listwatch_cmd, 0,
"Display all watchpoints.", NULL,NULL) },
#endif
{ DDB_END_CMD },
};

static const struct db_command db_command_table[] = {
{ DDB_ADD_CMD("b", db_breakpoint_cmd, 0,
"Set a breakpoint at address", "[/u] address[,count].",NULL) },
{ DDB_ADD_CMD("break", db_breakpoint_cmd, 0,
"Set a breakpoint at address", "[/u] address[,count].",NULL) },
{ DDB_ADD_CMD("bt", db_stack_trace_cmd, 0,
"Show backtrace.", "See help trace.",NULL) },
{ DDB_ADD_CMD("c", db_continue_cmd, 0,
"Continue execution.", "[/c]",NULL) },
{ DDB_ADD_CMD("call", db_fncall, CS_OWN,
"Call the function", "address[(expression[,...])]",NULL) },
{ DDB_ADD_CMD("callout", db_show_callout, 0, NULL,
NULL,NULL ) },
{ DDB_ADD_CMD("continue", db_continue_cmd, 0,
"Continue execution.", "[/c]",NULL) },
{ DDB_ADD_CMD("d", db_delete_cmd, 0,
"Delete a breakpoint.", "address | #number",NULL) },
{ DDB_ADD_CMD("delete", db_delete_cmd, 0,
"Delete a breakpoint.", "address | #number",NULL) },
{ DDB_ADD_CMD("dmesg", db_dmesg, 0,
"Show kernel message buffer.", "[count]",NULL) },
{ DDB_ADD_CMD("dwatch", db_deletewatch_cmd, 0,
"Delete the watchpoint.", "address",NULL) },
{ DDB_ADD_CMD("examine", db_examine_cmd, CS_SET_DOT,
"Display the address locations.",
"[/modifier] address[,count]",NULL) },
{ DDB_ADD_CMD("exit", db_continue_cmd, 0,
"Continue execution.", "[/c]",NULL) },
{ DDB_ADD_CMD("help", db_help_print_cmd, CS_OWN|CS_NOREPEAT,
"Display help about commands",
"Use other commands as arguments.",NULL) },
{ DDB_ADD_CMD("kill", db_kill_proc, CS_OWN,
"Send a signal to the process","pid[,signal_number]",
" pid:\t\t\tthe process id (may need 0t prefix for decimal)\n"
" signal_number:\tthe signal to send") },
#ifdef KGDB
{ DDB_ADD_CMD("kgdb", db_kgdb_cmd, 0, NULL,NULL,NULL) },
#endif
{ DDB_ADD_CMD("machine",NULL,CS_MACH,
"Architecture specific functions.",NULL,NULL) },
{ DDB_ADD_CMD("match", db_trace_until_matching_cmd,0,
"Stop at the matching return instruction.","See help next",NULL) },
{ DDB_ADD_CMD("next", db_trace_until_matching_cmd,0,
"Stop at the matching return instruction.","[/p]",NULL) },
{ DDB_ADD_CMD("p", db_print_cmd, 0,
"Print address according to the format.",
"[/axzodurc] address [address ...]",NULL) },
{ DDB_ADD_CMD("print", db_print_cmd, 0,
"Print address according to the format.",
"[/axzodurc] address [address ...]",NULL) },
{ DDB_ADD_CMD("ps", db_show_all_procs, 0,
"Print all processes.","See show all procs",NULL) },
{ DDB_ADD_CMD("quit", db_continue_cmd, 0,
"Continue execution.", "[/c]",NULL) },
{ DDB_ADD_CMD("reboot", db_reboot_cmd, CS_OWN,
"Reboot","0x1 RB_ASKNAME, 0x2 RB_SINGLE, 0x4 RB_NOSYNC, 0x8 RB_HALT,"
"0x40 RB_KDB, 0x100 RB_DUMP, 0x808 RB_POWERDOWN",NULL) },
{ DDB_ADD_CMD("s", db_single_step_cmd, 0,
"Single-step count times.","[/p] [,count]",NULL) },
{ DDB_ADD_CMD("search", db_search_cmd, CS_OWN|CS_SET_DOT,
"Search memory from address for value.",
"[/bhl] address value [mask] [,count]",NULL) },
{ DDB_ADD_CMD("set", db_set_cmd, CS_OWN,
"Set the named variable","$variable [=] expression",NULL) },
{ DDB_ADD_CMD("show", NULL, CS_SHOW,
"Show kernel stats.", NULL,NULL) },
{ DDB_ADD_CMD("sifting", db_sifting_cmd, CS_OWN,
"Search the symbol tables ","[/F] string",NULL) },
{ DDB_ADD_CMD("step", db_single_step_cmd, 0,
"Single-step count times.","[/p] [,count]",NULL) },
{ DDB_ADD_CMD("sync", db_sync_cmd, CS_OWN,
"Force a crash dump, and then reboot.",NULL,NULL) },
{ DDB_ADD_CMD("trace", db_stack_trace_cmd, 0,
"Stack trace from frame-address.",
"[/u[l]] [frame-address][,count]",NULL) },
{ DDB_ADD_CMD("until", db_trace_until_call_cmd,0,
"Stop at the next call or return instruction.","[/p]",NULL) },
{ DDB_ADD_CMD("w", db_write_cmd, CS_MORE|CS_SET_DOT,
"Write the expressions at succeeding locations.",
"[/bhl] address expression [expression ...]",NULL) },
{ DDB_ADD_CMD("watch", db_watchpoint_cmd, CS_MORE,
"Set a watchpoint for a region. ","address[,size]",NULL) },
{ DDB_ADD_CMD("whatis", db_whatis_cmd, 0,
"Describe what an address is", "address", NULL) },
{ DDB_ADD_CMD("write", db_write_cmd, CS_MORE|CS_SET_DOT,
"Write the expressions at succeeding locations.",
"[/bhl] address expression [expression ...]",NULL) },
{ DDB_ADD_CMD("x", db_examine_cmd, CS_SET_DOT,
"Display the address locations.",
"[/modifier] address[,count]",NULL) },
{ DDB_END_CMD },
};

static const struct db_command *db_last_command = NULL;
#if defined(DDB_COMMANDONENTER)
char db_cmd_on_enter[DB_LINE_MAXLEN + 1] = ___STRING(DDB_COMMANDONENTER);
#else /* defined(DDB_COMMANDONENTER) */
char db_cmd_on_enter[DB_LINE_MAXLEN + 1] = "";
#endif /* defined(DDB_COMMANDONENTER) */
#define DB_LINE_SEP ';'

/*
* Execute commandlist after ddb start
* This function goes through the command list created from commands and ';'
*/
static void
db_execute_commandlist(const char *cmdlist)
{
const char *cmd = cmdlist;
const struct db_command *dummy = NULL;

while (*cmd != '\0') {
const char *ep = cmd;

while (*ep != '\0' && *ep != DB_LINE_SEP) {
ep++;
}
db_set_line(cmd, ep);
db_command(&dummy);
cmd = ep;
if (*cmd == DB_LINE_SEP) {
cmd++;
}
}
}

/* Initialize ddb command tables */
void
db_init_commands(void)
{
static bool done = false;

if (done) return;
done = true;

/* register command tables */
(void)db_register_tbl_entry(DDB_BASE_CMD, &db_base_cmd_builtins);
#ifdef DB_MACHINE_COMMANDS
(void)db_register_tbl_entry(DDB_MACH_CMD, &db_mach_cmd_builtins);
#endif
(void)db_register_tbl_entry(DDB_SHOW_CMD, &db_show_cmd_builtins);
}

/*
* Add command table to the specified list
* Arg:
* int type specifies type of command table DDB_SHOW_CMD|DDB_BASE_CMD|DDB_MAC_CMD
* *cmd_tbl pointer to static allocated db_command table
*
* Command table must be NULL terminated array of struct db_command
*/
int
db_register_tbl(uint8_t type, const struct db_command *cmd_tbl)
{
struct db_cmd_tbl_en *list_ent;

/* empty list - ignore */
if (cmd_tbl->name == 0)
return 0;

/* force builtin commands to be registered first */
db_init_commands();

/* now create a list entry for this table */
list_ent = db_zalloc(sizeof(*list_ent));
if (list_ent == NULL)
return ENOMEM;
list_ent->db_cmd=cmd_tbl;

/* and register it */
return db_register_tbl_entry(type, list_ent);
}

static int
db_register_tbl_entry(uint8_t type, struct db_cmd_tbl_en *list_ent)
{
struct db_cmd_tbl_en_head *list;

switch(type) {
case DDB_BASE_CMD:
list = &db_base_cmd_list;
break;
case DDB_SHOW_CMD:
list = &db_show_cmd_list;
break;
case DDB_MACH_CMD:
list = &db_mach_cmd_list;
break;
default:
return ENOENT;
}

TAILQ_INSERT_TAIL(list, list_ent, db_cmd_next);

return 0;
}

/*
* Remove command table specified with db_cmd address == cmd_tbl
*/
int
db_unregister_tbl(uint8_t type,const struct db_command *cmd_tbl)
{
struct db_cmd_tbl_en *list_ent;
struct db_cmd_tbl_en_head *list;

/* find list on which the entry should live */
switch (type) {
case DDB_BASE_CMD:
list=&db_base_cmd_list;
break;
case DDB_SHOW_CMD:
list=&db_show_cmd_list;
break;
case DDB_MACH_CMD:
list=&db_mach_cmd_list;
break;
default:
return EINVAL;
}

TAILQ_FOREACH (list_ent, list, db_cmd_next) {
if (list_ent->db_cmd == cmd_tbl){
TAILQ_REMOVE(list,
list_ent, db_cmd_next);
db_free(list_ent, sizeof(*list_ent));
return 0;
}
}
return ENOENT;
}

#ifndef _KERNEL
#define cnpollc(c) __nothing
#endif

/*
* This function is called via db_trap() or directly from
* machine trap code.
*/
void
db_command_loop(void)
{
label_t db_jmpbuf;
label_t *savejmp;

/*
* Initialize 'prev' and 'next' to dot.
*/
db_prev = db_dot;
db_next = db_dot;

db_cmd_loop_done = false;

/* Init default command tables add machine, base,
show command tables to the list */
db_init_commands();

/* save context for return from ddb */
savejmp = db_recover;
db_recover = &db_jmpbuf;

/*
* Execute default ddb start commands only if this is the
* first entry into DDB, in case the start commands fault
* and we recurse into here.
*/
if (savejmp == NULL && db_cmd_on_enter[0] != '\0') {
if (setjmp(&db_jmpbuf) == 0)
db_execute_commandlist(db_cmd_on_enter);
}

(void) setjmp(&db_jmpbuf);
while (!db_cmd_loop_done) {
if (db_print_position() != 0)
db_printf("\n");
db_output_line = 0;
cnpollc(1);
(void) db_read_line();
cnpollc(0);
db_command(&db_last_command);
}

db_recover = savejmp;
}

/*
* Search command table for command prefix
*/
static int
db_cmd_search_table(const char *name,
const struct db_command *table,
const struct db_command **cmdp)
{

const struct db_command *cmd;
int result;

result = CMD_NONE;
*cmdp = NULL;

for (cmd = table; cmd->name != 0; cmd++) {
const char *lp;
const char *rp;

lp = name;
rp = cmd->name;
while (*lp != '\0' && *lp == *rp) {
rp++;
lp++;
}

if (*lp != '\0') /* mismatch or extra chars in name */
continue;

if (*rp == '\0') { /* exact match */
*cmdp = cmd;
return (CMD_EXACT);
}

/* prefix match: end of name, not end of command */
if (result == CMD_NONE) {
result = CMD_PREFIX;
*cmdp = cmd;
}
else if (result == CMD_PREFIX) {
result = CMD_AMBIGUOUS;
*cmdp = NULL;
}
}

return (result);
}

/*
* Search list of command tables for command
*/
static int
db_cmd_search(const char *name,
struct db_cmd_tbl_en_head *list_head,
const struct db_command **cmdp)
{
struct db_cmd_tbl_en *list_ent;
const struct db_command *found_command;
bool accept_prefix_match;
int result;

result = CMD_NONE;
found_command = NULL;
accept_prefix_match = true;

TAILQ_FOREACH(list_ent, list_head, db_cmd_next) {
const struct db_command *cmd;
int found;

found = db_cmd_search_table(name, list_ent->db_cmd, &cmd);
if (found == CMD_EXACT) {
result = CMD_EXACT;
found_command = cmd;
break;
}

if (found == CMD_PREFIX) {
if (accept_prefix_match) {
/*
* Continue search, but note current result
* in case we won't find anything else.
*/
accept_prefix_match = false;
result = CMD_PREFIX;
found_command = cmd;
} else {
/*
* Watch out for globally ambiguous
* prefix match that is not locally
* ambiguous - with one match in one
* table and another match(es) in
* another table.
*/
result = CMD_AMBIGUOUS;
found_command = NULL;
}
}
else if (found == CMD_AMBIGUOUS) {
accept_prefix_match = false;
result = CMD_AMBIGUOUS;
found_command = NULL;
}
}

*cmdp = found_command;
return result;
}

static void
db_cmd_search_failed(char *name, int search_result)
{
if (search_result == CMD_NONE)
db_printf("No such command: %s\n", name);
else
db_printf("Ambiguous command: %s\n", name);
}

/*
* List commands to the console.
*/
static void
db_cmd_list(const struct db_cmd_tbl_en_head *list)
{

struct db_cmd_tbl_en *list_ent;
const struct db_command *table;
size_t i, j, w, columns, lines, numcmds, width=0;
const char *p;

TAILQ_FOREACH(list_ent,list,db_cmd_next) {
table = list_ent->db_cmd;
for (i = 0; table[i].name != NULL; i++) {
w = strlen(table[i].name);
if (w > width)
width = w;
}
}

width = DB_NEXT_TAB(width);

columns = db_max_width / width;
if (columns == 0)
columns = 1;

TAILQ_FOREACH(list_ent,list,db_cmd_next) {
table = list_ent->db_cmd;

for (numcmds = 0; table[numcmds].name != NULL; numcmds++)
;
lines = (numcmds + columns - 1) / columns;

for (i = 0; i < lines; i++) {
for (j = 0; j < columns; j++) {
p = table[j * lines + i].name;
if (p)
db_printf("%s", p);
if (j * lines + i + lines >= numcmds) {
db_putchar('\n');
break;
}
if (p) {
w = strlen(p);
while (w < width) {
w = DB_NEXT_TAB(w);
db_putchar('\t');
}
}
}
}
}
return;
}

/*
* Read complete command with all subcommands, starting with current
* db_tok_string. If subcommand is missing, print the list of all
* subcommands. If command/subcommand is not found, print an error
* message. Returns pointer to "leaf" command or NULL.
*/
static const struct db_command *
db_read_command(void)
{
const struct db_command *command;
struct db_cmd_tbl_en_head *list;
int found;
int t;

list = &db_base_cmd_list;
do {
found = db_cmd_search(db_tok_string, list, &command);
if (command == NULL) {
db_cmd_search_failed(db_tok_string, found);
db_flush_lex();
return NULL;
}

if (command->flag == CS_SHOW)
list = &db_show_cmd_list;
else if (command->flag == CS_MACH)
list = &db_mach_cmd_list;
else if (command->flag == CS_COMPAT)
/* same list */;
else
break; /* expect no more subcommands */

t = db_read_token(); /* read subcommand */
if (t != tIDENT) {
/* if none given - just print all of them */
db_cmd_list(list);
db_flush_lex();
return NULL;
}
} while (list != NULL);

return command;
}

/*
* Parse command line and execute appropriate function.
*/
static void
db_command(const struct db_command **last_cmdp)
{
static db_expr_t last_count = 0;

int t;
const struct db_command *command;
db_expr_t addr, count;
bool have_addr;
char modif[TOK_STRING_SIZE];

command = NULL;
have_addr = false;
count = -1;

t = db_read_token();
if ((t == tEOL) || (t == tCOMMA)) {
/*
* An empty line repeats last command, at 'next'.
* Only a count repeats the last command with the new count.
*/
command = *last_cmdp;

if (!command)
return;

addr = (db_expr_t)db_next;
if (t == tCOMMA) {
if (!db_expression(&count)) {
db_printf("Count missing\n");
db_flush_lex();
return;
}
} else
count = last_count;
modif[0] = '\0';
db_skip_to_eol();

} else if (t == tEXCL) {
db_fncall(0, 0, 0, NULL);
return;

} else if (t != tIDENT) {
db_printf("?\n");
db_flush_lex();
return;

} else {

command = db_read_command();
if (command == NULL)
return;

if ((command->flag & CS_OWN) == 0) {

/*
* Standard syntax:
* command [/modifier] [addr] [,count]
*/
t = db_read_token(); /* get modifier */
if (t == tSLASH) {
t = db_read_token();
if (t != tIDENT) {
db_printf("Bad modifier\n");
db_flush_lex();
return;
}
/* save modifier */
strlcpy(modif, db_tok_string, sizeof(modif));

} else {
db_unread_token(t);
modif[0] = '\0';
}

if (db_expression(&addr)) { /*get address*/
db_dot = (db_addr_t) addr;
db_last_addr = db_dot;
have_addr = true;
} else {
addr = (db_expr_t) db_dot;
}

t = db_read_token();
if (t == tCOMMA) { /*Get count*/
if (!db_expression(&count)) {
db_printf("Count missing\n");
db_flush_lex();
return;
}
} else {
db_unread_token(t);
}
if ((command->flag & CS_MORE) == 0) {
db_skip_to_eol();
}
}
}

if (command != NULL && command->flag & CS_NOREPEAT) {
*last_cmdp = NULL;
last_count = 0;
} else {
*last_cmdp = command;
last_count = count;
}

if (command != NULL) {
/*
* Execute the command.
*/
if (command->fcn != NULL)
(*command->fcn)(addr, have_addr, count, modif);

if (command->flag & CS_SET_DOT) {
/*
* If command changes dot, set dot to
* previous address displayed (if 'ed' style).
*/
if (db_ed_style)
db_dot = db_prev;
else
db_dot = db_next;
} else {
/*
* If command does not change dot,
* set 'next' location to be the same.
*/
db_next = db_dot;
}
}
}

/*
* Print help for commands
*/
static void
db_help_print_cmd(db_expr_t addr, bool have_addr, db_expr_t count,
const char *modif)
{
const struct db_command *command;
int t;

t = db_read_token();

/* is there another command after the "help"? */
if (t != tIDENT) {
/* print base commands */
db_cmd_list(&db_base_cmd_list);
return;
}

command = db_read_command();
if (command == NULL)
return;

#ifdef DDB_VERBOSE_HELP
db_printf("Command: %s\n", command->name);
if (command->cmd_descr != NULL)
db_printf(" Description: %s\n", command->cmd_descr);
if (command->cmd_arg != NULL)
db_printf(" Arguments: %s\n", command->cmd_arg);
if (command->cmd_arg_help != NULL)
db_printf(" Arguments description:\n%s\n",
command->cmd_arg_help);
if ((command->cmd_arg == NULL) && (command->cmd_descr == NULL))
db_printf(" No help message.\n");
#endif

db_skip_to_eol();
}

/*ARGSUSED*/
static void
db_kqueue_print_cmd(db_expr_t addr, bool have_addr, db_expr_t count,
const char *modif)
{
#ifdef _KERNEL
bool full = false;

if (modif[0] == 'f')
full = true;

if (have_addr == false) {
db_printf("%s: must specify kqueue address\n", __func__);
return;
}

kqueue_printit((struct kqueue *)(uintptr_t) addr, full, db_printf);
#else
db_kernelonly();
#endif /* XXX CRASH(8) */
}

/*ARGSUSED*/
static void
db_map_print_cmd(db_expr_t addr, bool have_addr, db_expr_t count,
const char *modif)
{
#ifdef _KERNEL
bool full = false;

if (modif[0] == 'f')
full = true;

if (have_addr == false)
addr = (db_expr_t)(uintptr_t)db_read_ptr("kernel_map");

uvm_map_printit((struct vm_map *)(uintptr_t) addr, full, db_printf);
#else
db_kernelonly();
#endif /* XXX CRASH(8) */
}

/*ARGSUSED*/
static void
db_object_print_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{
#ifdef _KERNEL /* XXX CRASH(8) */
bool full = false;

if (modif[0] == 'f')
full = true;

uvm_object_printit((struct uvm_object *)(uintptr_t) addr, full,
db_printf);
#else
db_kernelonly();
#endif
}

/*ARGSUSED*/
static void
db_page_print_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{
#ifdef _KERNEL /* XXX CRASH(8) */
bool full = false;

if (modif[0] == 'f')
full = true;

uvm_page_printit((struct vm_page *)(uintptr_t) addr, full, db_printf);
#else
db_kernelonly();
#endif
}

/*ARGSUSED*/
static void
db_show_all_pages(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{

#ifdef _KERNEL /* XXX CRASH(8) */
uvm_page_printall(db_printf);
#else
db_kernelonly();
#endif
}

/*ARGSUSED*/
static void
db_buf_print_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{
#ifdef _KERNEL /* XXX CRASH(8) */
bool full = false;

if (modif[0] == 'f')
full = true;

vfs_buf_print((struct buf *)(uintptr_t) addr, full, db_printf);
#else
db_kernelonly();
#endif
}

/*ARGSUSED*/
static void
db_event_print_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{
bool showzero = false;
bool showall = true;
bool showintr = false;
bool showtrap = false;
bool showmisc = false;
struct evcnt ev, *evp;
char buf[80];
int i;

i = 0;
while (modif[i]) {
switch (modif[i]) {
case 'f':
showzero = true;
break;
case 'i':
showintr = true;
showall = false;
break;
case 't':
showtrap = true;
showall = false;
break;
case 'm':
showmisc = true;
showall = false;
break;
}
i++;
}

if (showall)
showmisc = showintr = showtrap = true;

evp = (struct evcnt *)db_read_ptr("allevents");
while (evp != NULL) {
db_read_bytes((db_addr_t)evp, sizeof(ev), (char *)&ev);
evp = ev.ev_list.tqe_next;
if (ev.ev_count == 0 && !showzero)
continue;
if (ev.ev_type == EVCNT_TYPE_INTR && !showintr)
continue;
if (ev.ev_type == EVCNT_TYPE_TRAP && !showtrap)
continue;
if (ev.ev_type == EVCNT_TYPE_MISC && !showmisc)
continue;
db_read_bytes((db_addr_t)ev.ev_group, ev.ev_grouplen + 1, buf);
db_printf("evcnt type %d: %s ", ev.ev_type, buf);
db_read_bytes((db_addr_t)ev.ev_name, ev.ev_namelen + 1, buf);
db_printf("%s = %lld\n", buf, (long long)ev.ev_count);
}
}

/*ARGSUSED*/
static void
db_vnode_print_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{
#ifdef _KERNEL /* XXX CRASH(8) */
bool full = false;

if (modif[0] == 'f')
full = true;

vfs_vnode_print((struct vnode *)(uintptr_t) addr, full, db_printf);
#else
db_kernelonly();
#endif
}

/*ARGSUSED*/
static void
db_vnode_lock_print_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{
#ifdef _KERNEL /* XXX CRASH(8) */
bool full = false;

if (modif[0] == 'f')
full = true;

vfs_vnode_lock_print((struct vnode *)(uintptr_t) addr, full, db_printf);
#else
db_kernelonly();
#endif
}

/*ARGSUSED*/
static void
db_vmem_print_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{

#ifdef _KERNEL /* XXX CRASH(8) */
vmem_print((uintptr_t) addr, modif, db_printf);
#else
db_kernelonly();
#endif
}

static void
db_mount_print_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{
#ifdef _KERNEL /* XXX CRASH(8) */
bool full = false;

if (modif[0] == 'f')
full = true;

vfs_mount_print((struct mount *)(uintptr_t) addr, full, db_printf);
#endif
}

static void
db_show_all_mounts(db_expr_t addr, bool have_addr, db_expr_t count, const char *modif)
{
#ifdef _KERNEL /* XXX CRASH(8) */
bool full = false;

if (modif[0] == 'f')
full = true;

vfs_mount_print_all(full, db_printf);
#else
db_kernelonly();
#endif
}

/*ARGSUSED*/
static void
db_mbuf_print_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{

#ifdef _KERNEL /* XXX CRASH(8) */
m_print((const struct mbuf *)(uintptr_t) addr, modif, db_printf);
#else
db_kernelonly();
#endif
}

/*ARGSUSED*/
static void
db_pool_print_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{

#ifdef _KERNEL /* XXX CRASH(8) */
pool_printit((struct pool *)(uintptr_t) addr, modif, db_printf);
#else
db_kernelonly();
#endif
}

/*ARGSUSED*/
static void
db_namecache_print_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{

#ifdef _KERNEL /* XXX CRASH(8) */
namecache_print((struct vnode *)(uintptr_t) addr, db_printf);
#else
db_kernelonly();
#endif
}

/*ARGSUSED*/
static void
db_uvmexp_print_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{

#ifdef _KERNEL /* XXX CRASH(8) */
uvmexp_print(db_printf);
#else
db_kernelonly();
#endif
}

/*ARGSUSED */
static void
db_socket_print_cmd(db_expr_t addr, bool have_addr, db_expr_t count,
const char *modif)
{

#ifdef _KERNEL /* XXX CRASH(8) */
socket_print(modif, db_printf);
#else
db_kernelonly();
#endif
}

#ifdef KERNHIST
/*ARGSUSED*/
static void
db_kernhist_print_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{

if (!have_addr)
addr = 0;

if (count == -1)
count = 0;

kernhist_print((void *)(uintptr_t)addr, count, modif, db_printf);
}
#endif

/*ARGSUSED*/
static void
db_lock_print_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{

lockdebug_lock_print(have_addr ? (void *)(uintptr_t)addr : NULL,
db_printf);
}

static void
db_show_all_locks(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{

#ifdef _KERNEL /* XXX CRASH(8) */
lockdebug_show_all_locks(db_printf, modif);
#else
db_kernelonly();
#endif
}

static void
db_show_all_tstiles(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{
struct proc *p;
bool trace = false;

if (modif[0] == 't')
trace = true;

db_printf("%5s %5s %16s %16s %8s %16s\n",
"PID", "LID", "COMMAND", "WAITING-FOR", "TYPE", "WAIT-CHANNEL");
for (p = db_proc_first(); p != NULL; p = db_proc_next(p)) {
pid_t pid = -1;
char comm[MAXCOMLEN + 1] = "";
struct lwp *l = NULL;

db_read_bytes((db_addr_t)&p->p_pid, sizeof(pid), (char *)&pid);
db_read_bytes((db_addr_t)p->p_comm, sizeof(comm), comm);
db_read_bytes((db_addr_t)&p->p_lwps.lh_first, sizeof(l),
(char *)&l);
while (l != NULL) {
wchan_t wchan = NULL;
char wchanname[128] = "";
lwpid_t lid = -1;
const struct syncobj *sobj = NULL;
struct lwp *owner = NULL;
char sobjname[sizeof(sobj->sobj_name)] = "";

db_read_bytes((db_addr_t)&l->l_wchan, sizeof(wchan),
(char *)&wchan);
if (wchan == NULL)
goto next;
db_symstr(wchanname, sizeof(wchanname),
(db_expr_t)(uintptr_t)wchan, DB_STGY_ANY);

db_read_bytes((db_addr_t)&l->l_lid, sizeof(lid),
(char *)&lid);
db_read_bytes((db_addr_t)&l->l_syncobj, sizeof(sobj),
(char *)&sobj);
if (sobj == NULL) {
db_printf("%5ld %5ld %16s %16s %8s %16s\n",
(long)pid,
(long)lid,
comm,
"(unknown)",
"",
wchanname);
goto next;
}
db_read_bytes((db_addr_t)&sobj->sobj_name,
sizeof(sobjname), sobjname);

owner = db_syncobj_owner(sobj, wchan);

db_printf("%5ld %5ld %16s %16lx %8s %16s\n",
(long)pid,
(long)lid,
comm,
(long)owner,
sobjname,
wchanname);

if (trace && owner != NULL) {
db_stack_trace_print(
(db_expr_t)(uintptr_t)owner,
/*have_addr*/true, /*count*/-1,
/*modif(lwp)*/"a", db_printf);
}

next: db_read_bytes((db_addr_t)&l->l_sibling.le_next,
sizeof(l), (char *)&l);
}
}
}

static void
db_show_all_freelists(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{

#ifdef _KERNEL /* XXX CRASH(8) */
uvm_page_print_freelists(db_printf);
#else
db_kernelonly();
#endif
}

static void
db_show_lockstats(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{

#ifdef _KERNEL /* XXX CRASH(8) */
lockdebug_show_lockstats(db_printf);
#else
db_kernelonly();
#endif
}

#ifdef FDT
/*ARGSUSED*/
static void
db_fdt_print_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{
#ifdef _KERNEL /* XXX CRASH(8) */
bool full = false;

if (modif[0] == 'f')
full = true;

fdt_print(have_addr ? (void *)(uintptr_t)addr : fdtbus_get_data(),
full, db_printf);
#else
db_kernelonly();
#endif
}
#endif

/*
* Call random function:
* !expr(arg,arg,arg)
*/
/*ARGSUSED*/
static void
db_fncall(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{
#ifdef _KERNEL
db_expr_t fn_addr;
#define MAXARGS 11
db_expr_t args[MAXARGS];
int nargs = 0;
db_expr_t retval;
db_expr_t (*func)(db_expr_t, ...);
int t;

if (!db_expression(&fn_addr)) {
db_printf("Bad function\n");
db_flush_lex();
return;
}
func = (db_expr_t (*)(db_expr_t, ...))(uintptr_t) fn_addr;

t = db_read_token();
if (t == tLPAREN) {
if (db_expression(&args[0])) {
nargs++;
while ((t = db_read_token()) == tCOMMA) {
if (nargs == MAXARGS) {
db_printf("Too many arguments\n");
db_flush_lex();
return;
}
if (!db_expression(&args[nargs])) {
db_printf("Argument missing\n");
db_flush_lex();
return;
}
nargs++;
}
db_unread_token(t);
}
if (db_read_token() != tRPAREN) {
db_printf("?\n");
db_flush_lex();
return;
}
}
db_skip_to_eol();

while (nargs < MAXARGS) {
args[nargs++] = 0;
}

retval = (*func)(args[0], args[1], args[2], args[3], args[4],
args[5], args[6], args[7], args[8], args[9]);
db_printf("%s\n", db_num_to_str(retval));
#else /* _KERNEL */
db_kernelonly();
#endif /* _KERNEL */
}

static void
db_reboot_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{
#ifdef _KERNEL
db_expr_t bootflags;

/* Flags, default to RB_AUTOBOOT */
if (!db_expression(&bootflags))
bootflags = (db_expr_t)RB_AUTOBOOT;
if (db_read_token() != tEOL) {
db_error("?\n");
/*NOTREACHED*/
}
/*
* We are leaving DDB, never to return upward.
* Clear db_recover so that we can debug faults in functions
* called from cpu_reboot.
*/
db_recover = 0;
/* Avoid all mutex errors */
lockdebug_dismiss();
panicstr = "reboot forced via kernel debugger";
/* Make it possible to break into the debugger again */
spl0();
kern_reboot((int)bootflags, NULL);
#else /* _KERNEL */
db_kernelonly();
#endif /* _KERNEL */
}

static void
db_sifting_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{
int mode, t;

t = db_read_token();
if (t == tSLASH) {
t = db_read_token();
if (t != tIDENT) {
bad_modifier:
db_printf("Bad modifier\n");
db_flush_lex();
return;
}
if (!strcmp(db_tok_string, "F"))
mode = 'F';
else
goto bad_modifier;
t = db_read_token();
} else
mode = 0;

if (t == tIDENT)
db_sifting(db_tok_string, mode);
else {
db_printf("Bad argument (non-string)\n");
db_flush_lex();
}
}

static void
db_stack_trace_cmd(db_expr_t addr, bool have_addr, db_expr_t count, const char *modif)
{
register const char *cp = modif;
register char c;
void (*pr)(const char *, ...);

pr = db_printf;
while ((c = *cp++) != 0)
if (c == 'l')
pr = (void (*)(const char *, ...))printf;

if (count == -1)
count = 65535;

db_stack_trace_print(addr, have_addr, count, modif, pr);
}

static void
db_sync_cmd(db_expr_t addr, bool have_addr,
db_expr_t count, const char *modif)
{
#ifdef _KERNEL
/*
* We are leaving DDB, never to return upward.
* Clear db_recover so that we can debug faults in functions
* called from cpu_reboot.
*/
db_recover = 0;
panicstr = "dump forced via kernel debugger";
kern_reboot(RB_DUMP, NULL);
#else /* _KERNEL */
db_kernelonly();
#endif /* _KERNEL */
}

/*
* Describe what an address is
*/
void
db_whatis_cmd(db_expr_t address, bool have_addr,
db_expr_t count, const char *modif)
{
const uintptr_t addr = (uintptr_t)address;

db_lwp_whatis(addr, db_printf);
#ifdef _KERNEL /* XXX CRASH(8) */
pool_whatis(addr, db_printf);
vmem_whatis(addr, db_printf);
uvm_whatis(addr, db_printf);
module_whatis(addr, db_printf);
#else
db_kernelonly();
#endif
}