/*
* 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
* 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.
*
* $Id: db_command.c,v 1.5 1994/05/25 08:51:12 rgrimes Exp $
*/
/*
* Author: David B. Golub, Carnegie Mellon University
* Date: 7/90
*/
/*
* Command dispatcher.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <ddb/ddb.h>
#include <ddb/db_lex.h>
#include <ddb/db_output.h>
#include <setjmp.h>
/*
* Exported global variables
*/
boolean_t db_cmd_loop_done;
jmp_buf db_jmpbuf;
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.
*/
boolean_t db_ed_style = TRUE;
/*
* Utility routine - discard tokens through end-of-line.
*/
void
db_skip_to_eol()
{
int t;
do {
t = db_read_token();
} while (t != tEOL);
}
/*
* Command table
*/
struct command {
char * name; /* command name */
void (*fcn)(); /* function to call */
int flag; /* extra info: */
#define CS_OWN 0x1 /* non-standard syntax */
#define CS_MORE 0x2 /* standard syntax, but may have other
words at end */
#define CS_SET_DOT 0x100 /* set dot after command */
struct command *more; /* another level of command */
};
/*
* Results of command search.
*/
#define CMD_UNIQUE 0
#define CMD_FOUND 1
#define CMD_NONE 2
#define CMD_AMBIGUOUS 3
#define CMD_HELP 4
/*
* Search for command prefix.
*/
int
db_cmd_search(name, table, cmdp)
char * name;
struct command *table;
struct command **cmdp; /* out */
{
struct command *cmd;
int result = CMD_NONE;
for (cmd = table; cmd->name != 0; cmd++) {
register char *lp;
register char *rp;
register 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);
}
void
db_cmd_list(table)
struct command *table;
{
register struct command *cmd;
for (cmd = table; cmd->name != 0; cmd++) {
db_printf("%-12s", cmd->name);
db_end_line();
}
}
void
db_command(last_cmdp, cmd_table)
struct command **last_cmdp; /* IN_OUT */
struct command *cmd_table;
{
struct command *cmd;
int t;
char modif[TOK_STRING_SIZE];
db_expr_t addr, count;
boolean_t have_addr = FALSE;
int result;
t = db_read_token();
if (t == tEOL) {
/* empty line repeats last command, at 'next' */
cmd = *last_cmdp;
addr = (db_expr_t)db_next;
have_addr = FALSE;
count = 1;
modif[0] = '\0';
}
else if (t == tEXCL) {
void db_fncall();
db_fncall();
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;
}
db_strcpy(modif, db_tok_string);
}
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;
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;
}
}
}
/*
* 'show' commands
*/
extern void db_listbreak_cmd();
extern void db_listwatch_cmd();
extern void db_show_regs(), db_show_one_thread(), db_show_all_threads();
extern void vm_map_print(), vm_object_print(), vm_page_print();
/* extern void db_ps(); */
extern void ipc_port_print();
void db_show_help();
struct command db_show_all_cmds[] = {
#if 0
{ "threads", db_show_all_threads, 0, 0 },
{ "procs", db_ps, 0, 0 },
#endif
{ (char *)0 }
};
struct command db_show_cmds[] = {
{ "all", 0, 0, db_show_all_cmds },
{ "registers", db_show_regs, 0, 0 },
{ "breaks", db_listbreak_cmd, 0, 0 },
{ "watches", db_listwatch_cmd, 0, 0 },
#if 0
{ "thread", db_show_one_thread, 0, 0 },
#endif
{ "map", vm_map_print, 0, 0 },
{ "object", vm_object_print, 0, 0 },
#if 0
{ "page", vm_page_print, 0, 0 },
#endif
#if 0
{ "port", ipc_port_print, 0, 0 },
#endif
{ (char *)0, }
};
extern void db_print_cmd(), db_examine_cmd(), db_set_cmd();
extern void db_search_cmd();
extern void db_write_cmd();
extern void db_delete_cmd(), db_breakpoint_cmd();
extern void db_deletewatch_cmd(), db_watchpoint_cmd();
extern void db_single_step_cmd(), db_trace_until_call_cmd(),
db_trace_until_matching_cmd(), db_continue_cmd();
extern void db_stack_trace_cmd();
void db_help_cmd();
void db_fncall();
struct command db_command_table[] = {
{ "print", db_print_cmd, 0, 0 },
{ "examine", db_examine_cmd, CS_SET_DOT, 0 },
{ "x", db_examine_cmd, CS_SET_DOT, 0 },
{ "search", db_search_cmd, CS_OWN|CS_SET_DOT, 0 },
{ "set", db_set_cmd, CS_OWN, 0 },
{ "write", db_write_cmd, CS_MORE|CS_SET_DOT, 0 },
{ "w", db_write_cmd, CS_MORE|CS_SET_DOT, 0 },
{ "delete", db_delete_cmd, 0, 0 },
{ "d", db_delete_cmd, 0, 0 },
{ "break", db_breakpoint_cmd, 0, 0 },
{ "dwatch", db_deletewatch_cmd, 0, 0 },
{ "watch", db_watchpoint_cmd, CS_MORE,0 },
{ "step", db_single_step_cmd, 0, 0 },
{ "s", db_single_step_cmd, 0, 0 },
{ "continue", db_continue_cmd, 0, 0 },
{ "c", db_continue_cmd, 0, 0 },
{ "until", db_trace_until_call_cmd,0, 0 },
{ "next", db_trace_until_matching_cmd,0, 0 },
{ "match", db_trace_until_matching_cmd,0, 0 },
{ "trace", db_stack_trace_cmd, 0, 0 },
{ "call", db_fncall, CS_OWN, 0 },
{ "show", 0, 0, db_show_cmds },
#if 0
{ "ps", db_ps, 0, 0 },
#endif
{ (char *)0, }
};
struct command *db_last_command = 0;
void
db_help_cmd()
{
struct command *cmd = db_command_table;
while (cmd->name != 0) {
db_printf("%-12s", cmd->name);
db_end_line();
cmd++;
}
}
void
db_command_loop()
{
/*
* Initialize 'prev' and 'next' to dot.
*/
db_prev = db_dot;
db_next = db_dot;
db_cmd_loop_done = 0;
while (!db_cmd_loop_done) {
(void) setjmp(db_jmpbuf);
if (db_print_position() != 0)
db_printf("\n");
db_printf("db> ");
(void) db_read_line();
db_command(&db_last_command, db_command_table);
}
}
void
db_error(s)
char *s;
{
if (s)
db_printf(s);
db_flush_lex();
longjmp(db_jmpbuf, 1);
}
/*
* Call random function:
* !expr(arg,arg,arg)
*/
void
db_fncall()
{
db_expr_t fn_addr;
#define MAXARGS 11
db_expr_t args[MAXARGS];
int nargs = 0;
db_expr_t retval;
db_expr_t (*func)();
int t;
if (!db_expression(&fn_addr)) {
db_printf("Bad function\n");
db_flush_lex();
return;
}
func = (db_expr_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("%#n\n", retval);
}
