/* $NetBSD: db_variables.c,v 1.30 2004/03/24 15:34:52 atatat 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 "AS IS" * 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. */ #include __KERNEL_RCSID(0, "$NetBSD: db_variables.c,v 1.30 2004/03/24 15:34:52 atatat Exp $"); #include "opt_ddbparam.h" #include #include #include #include #include #include #include #include #include #include #include #include /* * If this is non-zero, the DDB will be entered when the system * panics. Initialize it so that it's patchable. */ #ifndef DDB_ONPANIC #define DDB_ONPANIC 1 #endif int db_onpanic = DDB_ONPANIC; /* * Can DDB can be entered from the console? */ #ifndef DDB_FROMCONSOLE #define DDB_FROMCONSOLE 1 #endif int db_fromconsole = DDB_FROMCONSOLE; static int db_rw_internal_variable(const struct db_variable *, db_expr_t *, int); static int db_find_variable(const struct db_variable **); /* XXX must all be ints for sysctl. */ const struct db_variable db_vars[] = { { "radix", (void *)&db_radix, db_rw_internal_variable }, { "maxoff", (void *)&db_maxoff, db_rw_internal_variable }, { "maxwidth", (void *)&db_max_width, db_rw_internal_variable }, { "tabstops", (void *)&db_tab_stop_width, db_rw_internal_variable }, { "lines", (void *)&db_max_line, db_rw_internal_variable }, { "onpanic", (void *)&db_onpanic, db_rw_internal_variable }, { "fromconsole", (void *)&db_fromconsole, db_rw_internal_variable }, }; const struct db_variable * const db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]); /* * ddb command line access to the DDB variables defined above. */ static int db_rw_internal_variable(const struct db_variable *vp, db_expr_t *valp, int rw) { if (rw == DB_VAR_GET) *valp = *(int *)vp->valuep; else *(int *)vp->valuep = *valp; return (0); } /* * sysctl(3) access to the DDB variables defined above. */ SYSCTL_SETUP(sysctl_ddb_setup, "sysctl ddb subtree setup") { sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "ddb", NULL, NULL, 0, NULL, 0, CTL_DDB, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "radix", NULL, NULL, 0, &db_radix, 0, CTL_DDB, DDBCTL_RADIX, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "maxoff", NULL, NULL, 0, &db_maxoff, 0, CTL_DDB, DDBCTL_MAXOFF, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "maxwidth", NULL, NULL, 0, &db_max_width, 0, CTL_DDB, DDBCTL_MAXWIDTH, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "lines", NULL, NULL, 0, &db_max_line, 0, CTL_DDB, DDBCTL_LINES, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "tabstops", NULL, NULL, 0, &db_tab_stop_width, 0, CTL_DDB, DDBCTL_TABSTOPS, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "onpanic", NULL, NULL, 0, &db_onpanic, 0, CTL_DDB, DDBCTL_ONPANIC, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "fromconsole", NULL, NULL, 0, &db_fromconsole, 0, CTL_DDB, DDBCTL_FROMCONSOLE, CTL_EOL); } int db_find_variable(const struct db_variable **varp) { int t; const struct db_variable *vp; t = db_read_token(); if (t == tIDENT) { for (vp = db_vars; vp < db_evars; vp++) { if (!strcmp(db_tok_string, vp->name)) { *varp = vp; return (1); } } for (vp = db_regs; vp < db_eregs; vp++) { if (!strcmp(db_tok_string, vp->name)) { *varp = vp; return (1); } } } db_error("Unknown variable\n"); /*NOTREACHED*/ return 0; } int db_get_variable(db_expr_t *valuep) { const struct db_variable *vp; if (!db_find_variable(&vp)) return (0); db_read_variable(vp, valuep); return (1); } int db_set_variable(db_expr_t value) { const struct db_variable *vp; if (!db_find_variable(&vp)) return (0); db_write_variable(vp, &value); return (1); } void db_read_variable(const struct db_variable *vp, db_expr_t *valuep) { int (*func)(const struct db_variable *, db_expr_t *, int) = vp->fcn; if (func == FCN_NULL) *valuep = *(vp->valuep); else (*func)(vp, valuep, DB_VAR_GET); } void db_write_variable(const struct db_variable *vp, db_expr_t *valuep) { int (*func)(const struct db_variable *, db_expr_t *, int) = vp->fcn; if (func == FCN_NULL) *(vp->valuep) = *valuep; else (*func)(vp, valuep, DB_VAR_SET); } /*ARGSUSED*/ void db_set_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif) { db_expr_t value; db_expr_t old_value; const struct db_variable *vp; int t; t = db_read_token(); if (t != tDOLLAR) { db_error("Unknown variable\n"); /*NOTREACHED*/ } if (!db_find_variable(&vp)) { db_error("Unknown variable\n"); /*NOTREACHED*/ } t = db_read_token(); if (t != tEQ) db_unread_token(t); if (!db_expression(&value)) { db_error("No value\n"); /*NOTREACHED*/ } if (db_read_token() != tEOL) { db_error("?\n"); /*NOTREACHED*/ } db_read_variable(vp, &old_value); db_printf("$%s\t\t%s = ", vp->name, db_num_to_str(old_value)); db_printf("%s\n", db_num_to_str(value)); db_write_variable(vp, &value); }