NetBSD/sys/ddb/db_variables.c

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/* $NetBSD: db_variables.c,v 1.15 1999/04/06 20:09:21 pk Exp $ */
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/*
* 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''
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* 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.
*/
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#include "opt_ddb.h" /* for sysctl.h */
#include "opt_ddbparam.h"
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#include <sys/param.h>
#include <sys/proc.h>
#include <vm/vm.h>
#include <sys/sysctl.h>
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#include <machine/db_machdep.h>
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#include <ddb/ddbvar.h>
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#include <ddb/db_lex.h>
#include <ddb/db_variables.h>
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#include <ddb/db_command.h>
#include <ddb/db_sym.h>
#include <ddb/db_extern.h>
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/*
* 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;
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extern int db_radix;
extern int db_max_width;
extern int db_tab_stop_width;
extern int db_max_line;
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static int db_rw_internal_variable __P((struct db_variable *, db_expr_t *,
int));
/* XXX must all be ints for sysctl. */
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struct db_variable db_vars[] = {
{ "radix", (long *)&db_radix, db_rw_internal_variable },
{ "maxoff", (long *)&db_maxoff, db_rw_internal_variable },
{ "maxwidth", (long *)&db_max_width, db_rw_internal_variable },
{ "tabstops", (long *)&db_tab_stop_width, db_rw_internal_variable },
{ "lines", (long *)&db_max_line, db_rw_internal_variable },
{ "onpanic", (long *)&db_onpanic, db_rw_internal_variable },
{ "fromconsole", (long *)&db_onpanic, db_rw_internal_variable },
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};
struct db_variable *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(vp, valp, rw)
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.
*/
int
ddb_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
struct proc *p;
{
/* All sysctl names at this level are terminal. */
if (namelen != 1)
return (ENOTDIR);
switch (name[0]) {
case DDBCTL_RADIX:
return (sysctl_int(oldp, oldlenp, newp, newlen, &db_radix));
case DDBCTL_MAXOFF:
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return (sysctl_int(oldp, oldlenp, newp, newlen, &db_maxoff));
case DDBCTL_MAXWIDTH:
return (sysctl_int(oldp, oldlenp, newp, newlen,
&db_max_width));
case DDBCTL_TABSTOPS:
return (sysctl_int(oldp, oldlenp, newp, newlen,
&db_tab_stop_width));
case DDBCTL_LINES:
return (sysctl_int(oldp, oldlenp, newp, newlen, &db_max_line));
case DDBCTL_ONPANIC:
return (sysctl_int(oldp, oldlenp, newp, newlen, &db_onpanic));
case DDBCTL_FROMCONSOLE:
return (sysctl_int(oldp, oldlenp, newp, newlen,
&db_fromconsole));
}
return (EOPNOTSUPP);
}
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int
db_find_variable(varp)
struct db_variable **varp;
{
int t;
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");
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/*NOTREACHED*/
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return 0;
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}
int
db_get_variable(valuep)
db_expr_t *valuep;
{
struct db_variable *vp;
if (!db_find_variable(&vp))
return (0);
db_read_variable(vp, valuep);
return (1);
}
int
db_set_variable(value)
db_expr_t value;
{
struct db_variable *vp;
if (!db_find_variable(&vp))
return (0);
db_write_variable(vp, &value);
return (1);
}
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void
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db_read_variable(vp, valuep)
struct db_variable *vp;
db_expr_t *valuep;
{
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int (*func) __P((struct db_variable *, db_expr_t *, int)) = vp->fcn;
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if (func == FCN_NULL)
*valuep = *(vp->valuep);
else
(*func)(vp, valuep, DB_VAR_GET);
}
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void
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db_write_variable(vp, valuep)
struct db_variable *vp;
db_expr_t *valuep;
{
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int (*func) __P((struct db_variable *, db_expr_t *, int)) = vp->fcn;
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if (func == FCN_NULL)
*(vp->valuep) = *valuep;
else
(*func)(vp, valuep, DB_VAR_SET);
}
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/*ARGSUSED*/
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void
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db_set_cmd(addr, have_addr, count, modif)
db_expr_t addr;
int have_addr;
db_expr_t count;
char * modif;
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{
db_expr_t value;
struct db_variable *vp;
int t;
t = db_read_token();
if (t != tDOLLAR) {
db_error("Unknown variable\n");
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/*NOTREACHED*/
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}
if (!db_find_variable(&vp)) {
db_error("Unknown variable\n");
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/*NOTREACHED*/
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}
t = db_read_token();
if (t != tEQ)
db_unread_token(t);
if (!db_expression(&value)) {
db_error("No value\n");
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/*NOTREACHED*/
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}
if (db_read_token() != tEOL) {
db_error("?\n");
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/*NOTREACHED*/
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}
db_write_variable(vp, &value);
}