diff options
Diffstat (limited to 'sys/ddb/db_command.c')
| -rw-r--r-- | sys/ddb/db_command.c | 476 |
1 files changed, 476 insertions, 0 deletions
diff --git a/sys/ddb/db_command.c b/sys/ddb/db_command.c new file mode 100644 index 0000000..ed328be --- /dev/null +++ b/sys/ddb/db_command.c @@ -0,0 +1,476 @@ +/* + * 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 <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_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); +} |
