354 lines
8.6 KiB
C
354 lines
8.6 KiB
C
/* $NetBSD: db_variables.c,v 1.47 2020/03/10 15:58:37 christos Exp $ */
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/*
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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 "AS IS"
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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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: db_variables.c,v 1.47 2020/03/10 15:58:37 christos Exp $");
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#ifdef _KERNEL_OPT
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#include "opt_ddbparam.h"
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#endif
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <uvm/uvm_extern.h>
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#include <sys/sysctl.h>
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#include <ddb/ddb.h>
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#include <ddb/ddbvar.h>
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/*
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* If this is non-zero, the DDB will be entered when the system
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* panics. Initialize it so that it's patchable.
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*/
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#ifndef DDB_ONPANIC
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#define DDB_ONPANIC 1
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#endif
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int db_onpanic = DDB_ONPANIC;
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/*
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* Can DDB can be entered from the console?
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*/
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#ifndef DDB_FROMCONSOLE
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#define DDB_FROMCONSOLE 1
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#endif
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int db_fromconsole = DDB_FROMCONSOLE;
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/*
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* Output DDB output to the message buffer?
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*/
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#ifndef DDB_TEE_MSGBUF
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#define DDB_TEE_MSGBUF 0
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#endif
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int db_tee_msgbuf = DDB_TEE_MSGBUF;
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#ifndef DDB_PANICSTACKFRAMES
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#define DDB_PANICSTACKFRAMES 65535
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#endif
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int db_panicstackframes = DDB_PANICSTACKFRAMES;
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#ifndef DDB_DUMPSTACK
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#define DDB_DUMPSTACK 1
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#endif
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int db_dumpstack = DDB_DUMPSTACK;
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static int db_rw_internal_variable(const struct db_variable *, db_expr_t *,
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int);
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static int db_find_variable(const struct db_variable **);
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/* XXX must all be ints for sysctl. */
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const struct db_variable db_vars[] = {
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{
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.name = "fromconsole",
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.valuep = &db_fromconsole,
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.fcn = db_rw_internal_variable,
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.modif = NULL,
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},
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{
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.name = "maxoff",
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.valuep = &db_maxoff,
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.fcn = db_rw_internal_variable,
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.modif = NULL,
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},
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{
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.name = "maxwidth",
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.valuep = &db_max_width,
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.fcn = db_rw_internal_variable,
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.modif = NULL,
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},
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{
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.name = "lines",
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.valuep = &db_max_line,
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.fcn = db_rw_internal_variable,
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.modif = NULL,
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},
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{
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.name = "onpanic",
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.valuep = &db_onpanic,
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.fcn = db_rw_internal_variable,
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.modif = NULL,
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},
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{
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.name = "panicstackframes",
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.valuep = &db_panicstackframes,
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.fcn = db_rw_internal_variable,
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.modif = NULL,
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},
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{
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.name = "dumpstack",
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.valuep = &db_dumpstack,
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.fcn = db_rw_internal_variable,
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.modif = NULL,
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},
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{
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.name = "radix",
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.valuep = &db_radix,
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.fcn = db_rw_internal_variable,
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.modif = NULL,
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},
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{
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.name = "tabstops",
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.valuep = &db_tab_stop_width,
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.fcn = db_rw_internal_variable,
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.modif = NULL,
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},
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{
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.name = "tee_msgbuf",
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.valuep = &db_tee_msgbuf,
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.fcn = db_rw_internal_variable,
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.modif = NULL,
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},
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};
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const struct db_variable * const db_evars = db_vars + __arraycount(db_vars);
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/*
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* ddb command line access to the DDB variables defined above.
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*/
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static int
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db_rw_internal_variable(const struct db_variable *vp, db_expr_t *valp, int rw)
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{
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if (rw == DB_VAR_GET)
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*valp = *(int *)vp->valuep;
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else
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*(int *)vp->valuep = *valp;
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return (0);
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}
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/*
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* sysctl(3) access to the DDB variables defined above.
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*/
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#ifdef _KERNEL
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SYSCTL_SETUP(sysctl_ddb_setup, "sysctl ddb subtree setup")
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{
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
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CTLTYPE_INT, "radix",
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SYSCTL_DESCR("Input and output radix"),
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NULL, 0, &db_radix, 0,
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CTL_DDB, DDBCTL_RADIX, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
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CTLTYPE_INT, "maxoff",
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SYSCTL_DESCR("Maximum symbol offset"),
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NULL, 0, &db_maxoff, 0,
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CTL_DDB, DDBCTL_MAXOFF, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
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CTLTYPE_INT, "maxwidth",
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SYSCTL_DESCR("Maximum output line width"),
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NULL, 0, &db_max_width, 0,
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CTL_DDB, DDBCTL_MAXWIDTH, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
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CTLTYPE_INT, "lines",
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SYSCTL_DESCR("Number of display lines"),
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NULL, 0, &db_max_line, 0,
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CTL_DDB, DDBCTL_LINES, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
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CTLTYPE_INT, "tabstops",
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SYSCTL_DESCR("Output tab width"),
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NULL, 0, &db_tab_stop_width, 0,
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CTL_DDB, DDBCTL_TABSTOPS, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
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CTLTYPE_INT, "onpanic",
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SYSCTL_DESCR("Whether to enter ddb on a kernel panic"),
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NULL, 0, &db_onpanic, 0,
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CTL_DDB, DDBCTL_ONPANIC, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
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CTLTYPE_INT, "fromconsole",
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SYSCTL_DESCR("Whether ddb can be entered from the "
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"console"),
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NULL, 0, &db_fromconsole, 0,
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CTL_DDB, DDBCTL_FROMCONSOLE, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
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CTLTYPE_INT, "tee_msgbuf",
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SYSCTL_DESCR("Whether to tee ddb output to the msgbuf"),
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NULL, 0, &db_tee_msgbuf, 0,
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CTL_DDB, CTL_CREATE, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
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CTLTYPE_STRING, "commandonenter",
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SYSCTL_DESCR("Command to be executed on each ddb enter"),
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NULL, 0, db_cmd_on_enter, DB_LINE_MAXLEN,
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CTL_DDB, CTL_CREATE, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
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CTLTYPE_INT, "panicstackframes",
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SYSCTL_DESCR("Number of stack frames to print on panic"),
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NULL, 0, &db_panicstackframes, 0,
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CTL_DDB, CTL_CREATE, CTL_EOL);
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sysctl_createv(clog, 0, NULL, NULL,
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CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
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CTLTYPE_INT, "dumpstack",
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SYSCTL_DESCR("On panic print stack trace"),
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NULL, 0, &db_dumpstack, 0,
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CTL_DDB, CTL_CREATE, CTL_EOL);
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}
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#endif /* _KERNEL */
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int
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db_find_variable(const struct db_variable **varp)
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{
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int t;
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const struct db_variable *vp;
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t = db_read_token();
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if (t == tIDENT) {
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for (vp = db_vars; vp < db_evars; vp++) {
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if (!strcmp(db_tok_string, vp->name)) {
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*varp = vp;
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return (1);
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}
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}
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#ifdef _KERNEL
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for (vp = db_regs; vp < db_eregs; vp++) {
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if (!strcmp(db_tok_string, vp->name)) {
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*varp = vp;
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return (1);
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}
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}
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#endif
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}
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db_error("Unknown variable\n");
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/*NOTREACHED*/
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return 0;
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}
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int
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db_get_variable(db_expr_t *valuep)
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{
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const struct db_variable *vp;
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if (!db_find_variable(&vp))
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return (0);
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db_read_variable(vp, valuep);
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return (1);
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}
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int
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db_set_variable(db_expr_t value)
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{
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const struct db_variable *vp;
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if (!db_find_variable(&vp))
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return (0);
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db_write_variable(vp, &value);
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return (1);
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}
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void
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db_read_variable(const struct db_variable *vp, db_expr_t *valuep)
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{
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int (*func)(const struct db_variable *, db_expr_t *, int) = vp->fcn;
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if (func == FCN_NULL)
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*valuep = *(db_expr_t *)vp->valuep;
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else
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(*func)(vp, valuep, DB_VAR_GET);
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}
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void
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db_write_variable(const struct db_variable *vp, db_expr_t *valuep)
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{
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int (*func)(const struct db_variable *, db_expr_t *, int) = vp->fcn;
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if (func == FCN_NULL)
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*(db_expr_t *)vp->valuep = *valuep;
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else
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(*func)(vp, valuep, DB_VAR_SET);
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}
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/*ARGSUSED*/
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void
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db_set_cmd(db_expr_t addr, bool have_addr,
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db_expr_t count, const char *modif)
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{
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db_expr_t value;
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db_expr_t old_value;
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const struct db_variable *vp = NULL; /* XXX: GCC */
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int t;
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t = db_read_token();
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if (t != tDOLLAR) {
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db_error("Unknown variable\n");
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/*NOTREACHED*/
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}
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if (!db_find_variable(&vp)) {
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db_error("Unknown variable\n");
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/*NOTREACHED*/
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}
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t = db_read_token();
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if (t != tEQ)
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db_unread_token(t);
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if (!db_expression(&value)) {
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db_error("No value\n");
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/*NOTREACHED*/
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}
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if (db_read_token() != tEOL) {
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db_error("?\n");
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/*NOTREACHED*/
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}
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db_read_variable(vp, &old_value);
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db_printf("$%s\t\t%s = ", vp->name, db_num_to_str(old_value));
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db_printf("%s\n", db_num_to_str(value));
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db_write_variable(vp, &value);
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}
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