563 lines
12 KiB
C
563 lines
12 KiB
C
/*
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* Mach Operating System
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* Copyright (c) 1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $Id: db_command.c,v 1.31 1999/05/09 10:51:03 phk Exp $
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*/
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/*
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* Author: David B. Golub, Carnegie Mellon University
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* Date: 7/90
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*/
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/*
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* Command dispatcher.
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*/
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#include <sys/param.h>
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#include <sys/linker_set.h>
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#include <sys/reboot.h>
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#include <sys/systm.h>
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#include <machine/cons.h>
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#include <ddb/ddb.h>
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#include <ddb/db_command.h>
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#include <ddb/db_lex.h>
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#include <ddb/db_output.h>
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#include <setjmp.h>
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/*
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* Exported global variables
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*/
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boolean_t db_cmd_loop_done;
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extern struct linker_set db_cmd_set;
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db_addr_t db_dot;
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jmp_buf db_jmpbuf;
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db_addr_t db_last_addr;
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db_addr_t db_prev;
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db_addr_t db_next;
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extern struct linker_set db_show_cmd_set;
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static db_cmdfcn_t db_fncall;
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static db_cmdfcn_t db_gdb;
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/* XXX this is actually forward-static. */
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extern struct command db_show_cmds[];
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/*
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* if 'ed' style: 'dot' is set at start of last item printed,
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* and '+' points to next line.
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* Otherwise: 'dot' points to next item, '..' points to last.
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*/
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static boolean_t db_ed_style = TRUE;
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/*
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* Utility routine - discard tokens through end-of-line.
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*/
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void
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db_skip_to_eol()
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{
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int t;
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do {
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t = db_read_token();
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} while (t != tEOL);
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}
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/*
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* Results of command search.
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*/
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#define CMD_UNIQUE 0
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#define CMD_FOUND 1
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#define CMD_NONE 2
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#define CMD_AMBIGUOUS 3
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#define CMD_HELP 4
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static void db_cmd_list __P((struct command *table,
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struct command **aux_tablep));
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static int db_cmd_search __P((char *name, struct command *table,
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struct command **aux_tablep,
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struct command **cmdp));
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static void db_command __P((struct command **last_cmdp,
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struct command *cmd_table,
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struct command **aux_cmd_tablep));
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/*
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* Search for command prefix.
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*/
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static int
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db_cmd_search(name, table, aux_tablep, cmdp)
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char * name;
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struct command *table;
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struct command **aux_tablep;
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struct command **cmdp; /* out */
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{
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struct command *cmd;
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struct command **aux_cmdp;
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int result = CMD_NONE;
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for (cmd = table; cmd->name != 0; cmd++) {
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register char *lp;
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register char *rp;
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register int c;
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lp = name;
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rp = cmd->name;
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while ((c = *lp) == *rp) {
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if (c == 0) {
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/* complete match */
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*cmdp = cmd;
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return (CMD_UNIQUE);
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}
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lp++;
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rp++;
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}
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if (c == 0) {
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/* end of name, not end of command -
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partial match */
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if (result == CMD_FOUND) {
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result = CMD_AMBIGUOUS;
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/* but keep looking for a full match -
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this lets us match single letters */
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}
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else {
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*cmdp = cmd;
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result = CMD_FOUND;
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}
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}
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}
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if (result == CMD_NONE && aux_tablep != 0)
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/* XXX repeat too much code. */
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for (aux_cmdp = aux_tablep; *aux_cmdp != 0; aux_cmdp++) {
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register char *lp;
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register char *rp;
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register int c;
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lp = name;
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rp = (*aux_cmdp)->name;
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while ((c = *lp) == *rp) {
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if (c == 0) {
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/* complete match */
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*cmdp = *aux_cmdp;
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return (CMD_UNIQUE);
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}
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lp++;
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rp++;
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}
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if (c == 0) {
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/* end of name, not end of command -
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partial match */
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if (result == CMD_FOUND) {
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result = CMD_AMBIGUOUS;
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/* but keep looking for a full match -
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this lets us match single letters */
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}
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else {
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*cmdp = *aux_cmdp;
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result = CMD_FOUND;
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}
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}
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}
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if (result == CMD_NONE) {
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/* check for 'help' */
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if (name[0] == 'h' && name[1] == 'e'
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&& name[2] == 'l' && name[3] == 'p')
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result = CMD_HELP;
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}
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return (result);
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}
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static void
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db_cmd_list(table, aux_tablep)
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struct command *table;
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struct command **aux_tablep;
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{
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register struct command *cmd;
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register struct command **aux_cmdp;
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for (cmd = table; cmd->name != 0; cmd++) {
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db_printf("%-12s", cmd->name);
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db_end_line();
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}
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if (aux_tablep == 0)
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return;
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for (aux_cmdp = aux_tablep; *aux_cmdp != 0; aux_cmdp++) {
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db_printf("%-12s", (*aux_cmdp)->name);
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db_end_line();
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}
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}
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static void
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db_command(last_cmdp, cmd_table, aux_cmd_tablep)
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struct command **last_cmdp; /* IN_OUT */
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struct command *cmd_table;
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struct command **aux_cmd_tablep;
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{
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struct command *cmd;
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int t;
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char modif[TOK_STRING_SIZE];
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db_expr_t addr, count;
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boolean_t have_addr = FALSE;
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int result;
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t = db_read_token();
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if (t == tEOL) {
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/* empty line repeats last command, at 'next' */
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cmd = *last_cmdp;
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addr = (db_expr_t)db_next;
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have_addr = FALSE;
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count = 1;
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modif[0] = '\0';
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}
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else if (t == tEXCL) {
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db_fncall((db_expr_t)0, (boolean_t)0, (db_expr_t)0, (char *)0);
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return;
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}
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else if (t != tIDENT) {
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db_printf("?\n");
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db_flush_lex();
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return;
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}
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else {
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/*
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* Search for command
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*/
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while (cmd_table) {
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result = db_cmd_search(db_tok_string,
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cmd_table,
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aux_cmd_tablep,
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&cmd);
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switch (result) {
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case CMD_NONE:
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db_printf("No such command\n");
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db_flush_lex();
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return;
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case CMD_AMBIGUOUS:
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db_printf("Ambiguous\n");
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db_flush_lex();
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return;
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case CMD_HELP:
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db_cmd_list(cmd_table, aux_cmd_tablep);
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db_flush_lex();
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return;
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default:
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break;
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}
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if ((cmd_table = cmd->more) != 0) {
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/* XXX usually no more aux's. */
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aux_cmd_tablep = 0;
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if (cmd_table == db_show_cmds)
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aux_cmd_tablep =
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(struct command **)&db_show_cmd_set.ls_items[0];
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t = db_read_token();
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if (t != tIDENT) {
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db_cmd_list(cmd_table, aux_cmd_tablep);
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db_flush_lex();
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return;
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}
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}
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}
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if ((cmd->flag & CS_OWN) == 0) {
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/*
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* Standard syntax:
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* command [/modifier] [addr] [,count]
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*/
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t = db_read_token();
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if (t == tSLASH) {
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t = db_read_token();
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if (t != tIDENT) {
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db_printf("Bad modifier\n");
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db_flush_lex();
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return;
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}
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db_strcpy(modif, db_tok_string);
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}
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else {
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db_unread_token(t);
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modif[0] = '\0';
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}
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if (db_expression(&addr)) {
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db_dot = (db_addr_t) addr;
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db_last_addr = db_dot;
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have_addr = TRUE;
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}
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else {
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addr = (db_expr_t) db_dot;
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have_addr = FALSE;
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}
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t = db_read_token();
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if (t == tCOMMA) {
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if (!db_expression(&count)) {
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db_printf("Count missing\n");
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db_flush_lex();
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return;
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}
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}
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else {
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db_unread_token(t);
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count = -1;
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}
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if ((cmd->flag & CS_MORE) == 0) {
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db_skip_to_eol();
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}
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}
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}
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*last_cmdp = cmd;
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if (cmd != 0) {
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/*
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* Execute the command.
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*/
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(*cmd->fcn)(addr, have_addr, count, modif);
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if (cmd->flag & CS_SET_DOT) {
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/*
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* If command changes dot, set dot to
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* previous address displayed (if 'ed' style).
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*/
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if (db_ed_style) {
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db_dot = db_prev;
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}
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else {
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db_dot = db_next;
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}
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}
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else {
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/*
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* If command does not change dot,
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* set 'next' location to be the same.
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*/
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db_next = db_dot;
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}
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}
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}
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/*
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* 'show' commands
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*/
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static struct command db_show_all_cmds[] = {
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#if 0
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{ "threads", db_show_all_threads, 0, 0 },
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#endif
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{ "procs", db_ps, 0, 0 },
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{ (char *)0 }
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};
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static struct command db_show_cmds[] = {
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{ "all", 0, 0, db_show_all_cmds },
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{ "registers", db_show_regs, 0, 0 },
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{ "breaks", db_listbreak_cmd, 0, 0 },
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#if 0
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{ "thread", db_show_one_thread, 0, 0 },
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#endif
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#if 0
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{ "port", ipc_port_print, 0, 0 },
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#endif
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{ (char *)0, }
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};
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static struct command db_command_table[] = {
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{ "print", db_print_cmd, 0, 0 },
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{ "p", db_print_cmd, 0, 0 },
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{ "examine", db_examine_cmd, CS_SET_DOT, 0 },
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{ "x", db_examine_cmd, CS_SET_DOT, 0 },
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{ "search", db_search_cmd, CS_OWN|CS_SET_DOT, 0 },
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{ "set", db_set_cmd, CS_OWN, 0 },
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{ "write", db_write_cmd, CS_MORE|CS_SET_DOT, 0 },
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{ "w", db_write_cmd, CS_MORE|CS_SET_DOT, 0 },
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{ "delete", db_delete_cmd, 0, 0 },
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{ "d", db_delete_cmd, 0, 0 },
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{ "break", db_breakpoint_cmd, 0, 0 },
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{ "dwatch", db_deletewatch_cmd, 0, 0 },
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{ "watch", db_watchpoint_cmd, CS_MORE,0 },
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{ "step", db_single_step_cmd, 0, 0 },
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{ "s", db_single_step_cmd, 0, 0 },
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{ "continue", db_continue_cmd, 0, 0 },
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{ "c", db_continue_cmd, 0, 0 },
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{ "until", db_trace_until_call_cmd,0, 0 },
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{ "next", db_trace_until_matching_cmd,0, 0 },
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{ "match", db_trace_until_matching_cmd,0, 0 },
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{ "trace", db_stack_trace_cmd, 0, 0 },
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{ "call", db_fncall, CS_OWN, 0 },
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{ "show", 0, 0, db_show_cmds },
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{ "ps", db_ps, 0, 0 },
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{ "gdb", db_gdb, 0, 0 },
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{ (char *)0, }
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};
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static struct command *db_last_command = 0;
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#if 0
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void
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db_help_cmd()
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{
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struct command *cmd = db_command_table;
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while (cmd->name != 0) {
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db_printf("%-12s", cmd->name);
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db_end_line();
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cmd++;
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}
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}
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#endif
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/*
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* At least one non-optional command must be implemented using
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* DB_COMMAND() so that db_cmd_set gets created. Here is one.
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*/
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DB_COMMAND(panic, db_panic)
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{
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panic("from debugger");
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}
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void
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db_command_loop()
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{
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/*
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* Initialize 'prev' and 'next' to dot.
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*/
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db_prev = db_dot;
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db_next = db_dot;
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db_cmd_loop_done = 0;
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while (!db_cmd_loop_done) {
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(void) setjmp(db_jmpbuf);
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if (db_print_position() != 0)
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db_printf("\n");
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db_printf("db> ");
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(void) db_read_line();
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db_command(&db_last_command, db_command_table,
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(struct command **)&db_cmd_set.ls_items[0]);
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}
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}
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void
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db_error(s)
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char *s;
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{
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if (s)
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db_printf(s);
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db_flush_lex();
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longjmp(db_jmpbuf, 1);
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}
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/*
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* Call random function:
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* !expr(arg,arg,arg)
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*/
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static void
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db_fncall(dummy1, dummy2, dummy3, dummy4)
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db_expr_t dummy1;
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boolean_t dummy2;
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db_expr_t dummy3;
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char * dummy4;
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{
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db_expr_t fn_addr;
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#define MAXARGS 11 /* XXX only 10 are passed */
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db_expr_t args[MAXARGS];
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int nargs = 0;
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db_expr_t retval;
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typedef db_expr_t fcn_10args_t __P((db_expr_t, db_expr_t, db_expr_t,
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db_expr_t, db_expr_t, db_expr_t,
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db_expr_t, db_expr_t, db_expr_t,
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db_expr_t));
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fcn_10args_t *func;
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int t;
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if (!db_expression(&fn_addr)) {
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db_printf("Bad function\n");
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db_flush_lex();
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return;
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}
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func = (fcn_10args_t *)fn_addr; /* XXX */
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t = db_read_token();
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if (t == tLPAREN) {
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if (db_expression(&args[0])) {
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nargs++;
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while ((t = db_read_token()) == tCOMMA) {
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if (nargs == MAXARGS) {
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db_printf("Too many arguments\n");
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db_flush_lex();
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return;
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}
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if (!db_expression(&args[nargs])) {
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db_printf("Argument missing\n");
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db_flush_lex();
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return;
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}
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nargs++;
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}
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db_unread_token(t);
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}
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if (db_read_token() != tRPAREN) {
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db_printf("?\n");
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db_flush_lex();
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return;
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}
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}
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db_skip_to_eol();
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while (nargs < MAXARGS) {
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args[nargs++] = 0;
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}
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retval = (*func)(args[0], args[1], args[2], args[3], args[4],
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args[5], args[6], args[7], args[8], args[9] );
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db_printf("%#lr\n", (long)retval);
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}
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/* Enter GDB remote protocol debugger on the next trap. */
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dev_t gdbdev = NODEV;
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cn_getc_t *gdb_getc;
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cn_putc_t *gdb_putc;
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static void
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db_gdb (dummy1, dummy2, dummy3, dummy4)
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db_expr_t dummy1;
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boolean_t dummy2;
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db_expr_t dummy3;
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char * dummy4;
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{
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if (gdbdev == NODEV) {
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db_printf("No gdb port enabled. Set flag 0x80 on desired port\n");
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db_printf("in your configuration file (currently sio only).\n");
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return;
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|
}
|
|
boothowto ^= RB_GDB;
|
|
|
|
db_printf("Next trap will enter %s\n",
|
|
boothowto & RB_GDB ? "GDB remote protocol mode"
|
|
: "DDB debugger");
|
|
}
|