db_command.cxx

C++ 编写的EROS RTOS

/*	$NetBSD: db_command.c,v 1.13 1994/10/09 08:29:59 mycroft 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 
 * 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  [e-mail]
 *  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 <arch-kerninc/db_machdep.hxx>		/* type definitions */

#include <ddb/db_lex.hxx>
#include <ddb/db_output.hxx>
#include <ddb/db_command.hxx>
#include <ddb/db_expr.hxx>
#include <eros/setjmp.h>

#include <kerninc/util.h>

/*
 * Exported global variables
 */
bool	db_cmd_loop_done;
jmp_buf		*db_recover;

db_addr_t	db_dot;		/* current location */
db_addr_t	db_last_addr;	/* last explicit address typed */
db_addr_t	db_prev;	/* last address examined
					   or written */
db_addr_t	db_next;	/* next address to be examined
					   or written */

/*
 * 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.
 */
bool	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);
}

/*
 * 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(char *name, db_command *table, db_command **cmdp /* out */)
{
	struct db_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(db_command *table)
{
	int i = 0;
	register struct db_command *cmd;

	for (cmd = table; cmd->name != 0; cmd++) {
	    db_printf("%-12s", cmd->name);
	    i++;
	    if ((i % 6) == 0)
	      db_printf("\n");
	    db_end_line();
	}
}

void
db_command(db_command **last_cmdp /* IN_OUT */, db_command *cmd_table)
{
	struct db_command	*cmd;
	int		t;
	char		modif[TOK_STRING_SIZE];
	db_expr_t	addr, count;
	bool		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_expr_t, int, db_expr_t, char*);
	    db_fncall(0,0,0,0);
	    return;
	}
	else if (t == tQUERY) {
	    extern void db_sym_match(const char *symstr);
	    t = db_read_token();
	    db_sym_match(db_tok_string);
	    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;
		    }
		    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;
	    }
	}
}

#if 0
/*ARGSUSED*/
void
db_map_print_cmd(db_expr_t /* addr */, int /* have_addr */,
		 db_expr_t /* count */, char * /* modif */)
{
        extern void	_vm_map_print(db_expr_t, bool,
				      void (*)(const char *, ...));
        bool full = false;
        
        if (modif[0] == 'f')
                full = true;

        _vm_map_print(addr, full, db_printf);
}
#endif

/*ARGSUSED*/
#if 0
void
db_object_print_cmd(db_expr_t /* addr */, int /* have_addr */,
		    db_expr_t /* count */,
		    char * /* modif */)
{
        extern void	_vm_object_print(db_expr_t, bool,
				      void (*)(const char *, ...));
        bool full = false;
        
        if (modif[0] == 'f')
                full = true;

        _vm_object_print(addr, full, db_printf);
}
#endif

/*
 * 'show' commands
 */
#if 0
extern void	db_show_all_procs(db_expr_t, int, db_expr_t, char*);
extern void	db_show_callout(db_expr_t, int, db_expr_t, char*);
#endif
extern void	db_listbreak_cmd(db_expr_t, int, db_expr_t, char*);
#ifdef OPTION_OPTION_DDB_WATCH
extern void	db_listwatch_cmd(db_expr_t, int, db_expr_t, char*);
#endif
extern void	db_show_regs(db_expr_t, int, db_expr_t, char*);
void		db_show_help(db_expr_t, int, db_expr_t, char*);
extern void	db_rsrv_print_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_rsrvchain_print_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_ctxt_print_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_ctxt_kr_print_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_ctxt_keys_print_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_thread_print_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_inv_print_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_entry_print_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_exit_print_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_invokee_print_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_invokee_kr_print_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_invokee_keys_print_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_irq_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_pins_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_pmem_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_pte_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_mappings_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_uthread_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_reserves_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_kreserves_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_pages_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_nodes_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_counters_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_key_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_node_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_obhdr_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_sources(db_expr_t, int, db_expr_t, char*);
extern void	db_show_savearea_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_sizes_cmd(db_expr_t, int, db_expr_t, char*);
extern void	db_show_gdt(db_expr_t, int, db_expr_t, char*);
extern void	db_show_walkinfo_cmd(db_expr_t, int, db_expr_t, char*);

struct db_command db_show_all_cmds[] = {
#if 0
	{ "procs",	db_show_all_procs,0,	0 },
	{ "callout",	db_show_callout,0,	0 },
#endif