/* * 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 1.6 1994/08/13 03:49:16 wollman Exp $ */ /* * Author: David B. Golub, Carnegie Mellon University * Date: 7/90 */ /* * Command dispatcher. */ #include #include #include #include #include #include #include /* * 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_show_one_thread(), db_show_all_threads(); extern void 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, } }; 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); }