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|
/* $NetBSD: db_command.c,v 1.74 2003/11/18 18:26:18 dbj Exp $ */
/*
* 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 Software.Distribution@CS.CMU.EDU
* 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 1.74 2003/11/18 18:26:18 dbj Exp $");
#include "opt_ddb.h"
#include "opt_kgdb.h"
#include "opt_inet.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/reboot.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/namei.h>
#include <sys/pool.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <machine/db_machdep.h> /* type definitions */
#if defined(_KERNEL_OPT)
#include "opt_multiprocessor.h"
#endif
#ifdef MULTIPROCESSOR
#include <machine/cpu.h>
#endif
#include <ddb/db_lex.h>
#include <ddb/db_output.h>
#include <ddb/db_command.h>
#include <ddb/db_break.h>
#include <ddb/db_watch.h>
#include <ddb/db_run.h>
#include <ddb/db_variables.h>
#include <ddb/db_interface.h>
#include <ddb/db_sym.h>
#include <ddb/db_extern.h>
#include <uvm/uvm_extern.h>
#include <uvm/uvm_ddb.h>
#include "arp.h"
/*
* Results of command search.
*/
#define CMD_UNIQUE 0
#define CMD_FOUND 1
#define CMD_NONE 2
#define CMD_AMBIGUOUS 3
#define CMD_HELP 4
/*
* Exported global variables
*/
boolean_t 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;
/*
* 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 boolean_t db_ed_style = TRUE;
static void db_buf_print_cmd(db_expr_t, int, db_expr_t, char *);
static void db_cmd_list(const struct db_command *);
static int db_cmd_search(const char *, const struct db_command *,
const struct db_command **);
static void db_command(const struct db_command **,
const struct db_command *);
static void db_event_print_cmd(db_expr_t, int, db_expr_t, char *);
static void db_fncall(db_expr_t, int, db_expr_t, char *);
static void db_malloc_print_cmd(db_expr_t, int, db_expr_t, char *);
static void db_map_print_cmd(db_expr_t, int, db_expr_t, char *);
static void db_namecache_print_cmd(db_expr_t, int, db_expr_t, char *);
static void db_object_print_cmd(db_expr_t, int, db_expr_t, char *);
static void db_page_print_cmd(db_expr_t, int, db_expr_t, char *);
static void db_pool_print_cmd(db_expr_t, int, db_expr_t, char *);
static void db_reboot_cmd(db_expr_t, int, db_expr_t, char *);
static void db_sifting_cmd(db_expr_t, int, db_expr_t, char *);
static void db_stack_trace_cmd(db_expr_t, int, db_expr_t, char *);
static void db_sync_cmd(db_expr_t, int, db_expr_t, char *);
static void db_uvmexp_print_cmd(db_expr_t, int, db_expr_t, char *);
static void db_vnode_print_cmd(db_expr_t, int, db_expr_t, char *);
static void db_mount_print_cmd(db_expr_t, int, db_expr_t, char *);
/*
* 'show' commands
*/
static const struct db_command db_show_all_cmds[] = {
{ "callout", db_show_callout, 0, NULL },
{ "procs", db_show_all_procs, 0, NULL },
{ NULL, NULL, 0, NULL }
};
static const struct db_command db_show_cmds[] = {
{ "all", NULL, 0, db_show_all_cmds },
#if defined(INET) && (NARP > 0)
{ "arptab", db_show_arptab, 0, NULL },
#endif
{ "breaks", db_listbreak_cmd, 0, NULL },
{ "buf", db_buf_print_cmd, 0, NULL },
{ "event", db_event_print_cmd, 0, NULL },
{ "malloc", db_malloc_print_cmd, 0, NULL },
{ "map", db_map_print_cmd, 0, NULL },
{ "mount", db_mount_print_cmd, 0, NULL },
{ "ncache", db_namecache_print_cmd, 0, NULL },
{ "object", db_object_print_cmd, 0, NULL },
{ "page", db_page_print_cmd, 0, NULL },
{ "pool", db_pool_print_cmd, 0, NULL },
{ "registers", db_show_regs, 0, NULL },
{ "sched_qs", db_show_sched_qs, 0, NULL },
{ "uvmexp", db_uvmexp_print_cmd, 0, NULL },
{ "vnode", db_vnode_print_cmd, 0, NULL },
{ "watches", db_listwatch_cmd, 0, NULL },
{ NULL, NULL, 0, NULL }
};
static const struct db_command db_command_table[] = {
{ "b", db_breakpoint_cmd, 0, NULL },
{ "break", db_breakpoint_cmd, 0, NULL },
{ "bt", db_stack_trace_cmd, 0, NULL },
{ "c", db_continue_cmd, 0, NULL },
{ "call", db_fncall, CS_OWN, NULL },
{ "callout", db_show_callout, 0, NULL },
{ "continue", db_continue_cmd, 0, NULL },
{ "d", db_delete_cmd, 0, NULL },
{ "delete", db_delete_cmd, 0, NULL },
{ "dmesg", db_dmesg, 0, NULL },
{ "dwatch", db_deletewatch_cmd, 0, NULL },
{ "examine", db_examine_cmd, CS_SET_DOT, NULL },
{ "kill", db_kill_proc, CS_OWN, NULL },
#ifdef KGDB
{ "kgdb", db_kgdb_cmd, 0, NULL },
#endif
#ifdef DB_MACHINE_COMMANDS
{ "machine", NULL, 0, db_machine_command_table },
#endif
{ "match", db_trace_until_matching_cmd,0, NULL },
{ "next", db_trace_until_matching_cmd,0, NULL },
{ "p", db_print_cmd, 0, NULL },
{ "print", db_print_cmd, 0, NULL },
{ "ps", db_show_all_procs, 0, NULL },
{ "reboot", db_reboot_cmd, CS_OWN, NULL },
{ "s", db_single_step_cmd, 0, NULL },
{ "search", db_search_cmd, CS_OWN|CS_SET_DOT, NULL },
{ "set", db_set_cmd, CS_OWN, NULL },
{ "show", NULL, 0, db_show_cmds },
{ "sifting", db_sifting_cmd, CS_OWN, NULL },
{ "step", db_single_step_cmd, 0, NULL },
{ "sync", db_sync_cmd, CS_OWN, NULL },
{ "trace", db_stack_trace_cmd, 0, NULL },
{ "until", db_trace_until_call_cmd,0, NULL },
{ "w", db_write_cmd, CS_MORE|CS_SET_DOT, NULL },
{ "watch", db_watchpoint_cmd, CS_MORE, NULL },
{ "write", db_write_cmd, CS_MORE|CS_SET_DOT, NULL },
{ "x", db_examine_cmd, CS_SET_DOT, NULL },
{ NULL, NULL, 0, NULL }
};
static const struct db_command *db_last_command = NULL;
/*
* Utility routine - discard tokens through end-of-line.
*/
void
db_skip_to_eol(void)
{
int t;
do {
t = db_read_token();
} while (t != tEOL);
}
void
db_error(s)
char *s;
{
if (s)
db_printf("%s", s);
db_flush_lex();
longjmp(db_recover);
}
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 = 0;
savejmp = db_recover;
db_recover = &db_jmpbuf;
(void) setjmp(&db_jmpbuf);
while (!db_cmd_loop_done) {
if (db_print_position() != 0)
db_printf("\n");
db_output_line = 0;
#ifdef MULTIPROCESSOR
db_printf("db{%ld}> ", (long)cpu_number());
#else
db_printf("db> ");
#endif
(void) db_read_line();
db_command(&db_last_command, db_command_table);
}
db_recover = savejmp;
}
/*
* Search for command prefix.
*/
static int
db_cmd_search(const char *name, const struct db_command *table,
const struct db_command **cmdp)
{
const struct db_command *cmd;
int result = CMD_NONE;
for (cmd = table; cmd->name != 0; cmd++) {
const char *lp;
const char *rp;
int c;
lp = name;
rp = cmd->name;
while ((c = *lp) == *rp) {
if (c == 0) {
/* complete match */
*cmdp = cmd;
return (CMD_UNIQUE);
}
lp++;
rp++;
}
if (c == 0) {
/* end of name, not end of command -
partial match */
if (result == CMD_FOUND) {
result = CMD_AMBIGUOUS;
/* but keep looking for a full match -
this lets us match single letters */
} else {
*cmdp = cmd;
result = CMD_FOUND;
}
}
}
if (result == CMD_NONE) {
/* check for 'help' */
if (name[0] == 'h' && name[1] == 'e'
&& name[2] == 'l' && name[3] == 'p')
result = CMD_HELP;
}
return (result);
}
static void
db_cmd_list(const struct db_command *table)
{
int i, j, w, columns, lines, width=0, numcmds;
const char *p;
for (numcmds = 0; table[numcmds].name != NULL; numcmds++) {
w = strlen(table[numcmds].name);
if (w > width)
width = w;
}
width = DB_NEXT_TAB(width);
columns = db_max_width / width;
if (columns == 0)
columns = 1;
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;
}
w = strlen(p);
while (w < width) {
w = DB_NEXT_TAB(w);
db_putchar('\t');
}
}
}
}
static void
db_command(const struct db_command **last_cmdp,
const struct db_command *cmd_table)
{
const struct db_command *cmd;
int t;
char modif[TOK_STRING_SIZE];
db_expr_t addr, count;
boolean_t have_addr = FALSE;
int result;
static db_expr_t last_count = 0;
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.
*/
cmd = *last_cmdp;
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;
have_addr = FALSE;
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 {
/*
* Search for command
*/
while (cmd_table) {
result = db_cmd_search(db_tok_string, cmd_table, &cmd);
switch (result) {
case CMD_NONE:
db_printf("No such command\n");
db_flush_lex();
return;
case CMD_AMBIGUOUS:
db_printf("Ambiguous\n");
db_flush_lex();
return;
case CMD_HELP:
db_cmd_list(cmd_table);
db_flush_lex();
return;
default:
break;
}
if ((cmd_table = cmd->more) != 0) {
t = db_read_token();
if (t != tIDENT) {
db_cmd_list(cmd_table);
db_flush_lex();
return;
}
}
}
if ((cmd->flag & CS_OWN) == 0) {
/*
* Standard syntax:
* command [/modifier] [addr] [,count]
*/
t = db_read_token();
if (t == tSLASH) {
t = db_read_token();
if (t != tIDENT) {
db_printf("Bad modifier\n");
db_flush_lex();
return;
}
strlcpy(modif, db_tok_string, sizeof(modif));
} else {
db_unread_token(t);
modif[0] = '\0';
}
if (db_expression(&addr)) {
db_dot = (db_addr_t) addr;
db_last_addr = db_dot;
have_addr = TRUE;
} else {
addr = (db_expr_t) db_dot;
have_addr = FALSE;
}
t = db_read_token();
if (t == tCOMMA) {
if (!db_expression(&count)) {
db_printf("Count missing\n");
db_flush_lex();
return;
}
} else {
db_unread_token(t);
count = -1;
}
if ((cmd->flag & CS_MORE) == 0) {
db_skip_to_eol();
}
}
}
*last_cmdp = cmd;
last_count = count;
if (cmd != 0) {
/*
* Execute the command.
*/
(*cmd->fcn)(addr, have_addr, count, modif);
if (cmd->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;
}
}
}
/*ARGSUSED*/
static void
db_map_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
boolean_t full = FALSE;
if (modif[0] == 'f')
full = TRUE;
if (have_addr == FALSE)
addr = (db_expr_t)(intptr_t) kernel_map;
uvm_map_printit((struct vm_map *)(intptr_t) addr, full, db_printf);
}
/*ARGSUSED*/
static void
db_malloc_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
#ifdef MALLOC_DEBUG
if (!have_addr)
addr = 0;
debug_malloc_printit(db_printf, (vaddr_t) addr);
#else
db_printf("The kernel is not built with the MALLOC_DEBUG option.\n");
#endif /* MALLOC_DEBUG */
}
/*ARGSUSED*/
static void
db_object_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
boolean_t full = FALSE;
if (modif[0] == 'f')
full = TRUE;
uvm_object_printit((struct uvm_object *)(intptr_t) addr, full,
db_printf);
}
/*ARGSUSED*/
static void
db_page_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
boolean_t full = FALSE;
if (modif[0] == 'f')
full = TRUE;
uvm_page_printit((struct vm_page *)(intptr_t) addr, full, db_printf);
}
/*ARGSUSED*/
static void
db_buf_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
boolean_t full = FALSE;
if (modif[0] == 'f')
full = TRUE;
vfs_buf_print((struct buf *)(intptr_t) addr, full, db_printf);
}
/*ARGSUSED*/
static void
db_event_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
boolean_t full = FALSE;
if (modif[0] == 'f')
full = TRUE;
event_print(full, db_printf);
}
/*ARGSUSED*/
static void
db_vnode_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
boolean_t full = FALSE;
if (modif[0] == 'f')
full = TRUE;
vfs_vnode_print((struct vnode *)(intptr_t) addr, full, db_printf);
}
static void
db_mount_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
boolean_t full = FALSE;
if (modif[0] == 'f')
full = TRUE;
vfs_mount_print((struct mount *)(intptr_t) addr, full, db_printf);
}
/*ARGSUSED*/
static void
db_pool_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
pool_printit((struct pool *)(intptr_t) addr, modif, db_printf);
}
/*ARGSUSED*/
static void
db_namecache_print_cmd(db_expr_t addr, int have_addr, db_expr_t count,
char *modif)
{
namecache_print((struct vnode *)(intptr_t) addr, db_printf);
}
/*ARGSUSED*/
static void
db_uvmexp_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
uvmexp_print(db_printf);
}
/*
* Call random function:
* !expr(arg,arg,arg)
*/
/*ARGSUSED*/
static void
db_fncall(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
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, ...))(intptr_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));
}
static void
db_reboot_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
{
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;
cpu_reboot((int)bootflags, NULL);
}
static void
db_sifting_cmd(db_expr_t addr, int have_addr, db_expr_t count, 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, int have_addr, db_expr_t count, char *modif)
{
register char *cp = modif;
register char c;
void (*pr)(const char *, ...);
pr = db_printf;
while ((c = *cp++) != 0)
if (c == 'l')
pr = 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, int have_addr, db_expr_t count, char *modif)
{
/*
* 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;
cpu_reboot(RB_DUMP, NULL);
}
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