NetBSD/sys/ddb/db_variables.c

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/* $NetBSD: db_variables.c,v 1.28 2003/06/29 22:29:55 fvdl Exp $ */
/*
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* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* All Rights Reserved.
*
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* 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.
*
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* Carnegie Mellon requests users of this software to return to
*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
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* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
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#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: db_variables.c,v 1.28 2003/06/29 22:29:55 fvdl Exp $");
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#include "opt_ddbparam.h"
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#include <sys/param.h>
#include <sys/proc.h>
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#include <uvm/uvm_extern.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>
#include <ddb/db_output.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;
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. */
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const struct db_variable db_vars[] = {
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{ "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 },
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};
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const struct db_variable * const db_evars = db_vars + sizeof(db_vars)/sizeof(db_vars[0]);
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/*
* 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.
*/
int
ddb_sysctl(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(const struct db_variable **varp)
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{
int t;
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const struct db_variable *vp;
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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);
}
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}
for (vp = db_regs; vp < db_eregs; vp++) {
if (!strcmp(db_tok_string, vp->name)) {
*varp = vp;
return (1);
}
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}
}
db_error("Unknown variable\n");
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/*NOTREACHED*/
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return 0;
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}
int
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))
return (0);
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db_read_variable(vp, valuep);
return (1);
}
int
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))
return (0);
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db_write_variable(vp, &value);
return (1);
}
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void
db_read_variable(const struct db_variable *vp, db_expr_t *valuep)
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{
int (*func)(const struct db_variable *, db_expr_t *, int) = vp->fcn;
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if (func == FCN_NULL)
*valuep = *(vp->valuep);
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else
(*func)(vp, valuep, DB_VAR_GET);
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}
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void
db_write_variable(const struct db_variable *vp, db_expr_t *valuep)
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{
int (*func)(const struct db_variable *, db_expr_t *, int) = vp->fcn;
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if (func == FCN_NULL)
*(vp->valuep) = *valuep;
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else
(*func)(vp, valuep, DB_VAR_SET);
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}
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/*ARGSUSED*/
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void
db_set_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
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{
db_expr_t value;
db_expr_t old_value;
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const struct db_variable *vp;
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int t;
t = db_read_token();
if (t != tDOLLAR) {
db_error("Unknown variable\n");
/*NOTREACHED*/
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}
if (!db_find_variable(&vp)) {
db_error("Unknown variable\n");
/*NOTREACHED*/
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}
t = db_read_token();
if (t != tEQ)
db_unread_token(t);
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if (!db_expression(&value)) {
db_error("No value\n");
/*NOTREACHED*/
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}
if (db_read_token() != tEOL) {
db_error("?\n");
/*NOTREACHED*/
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}
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));
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db_write_variable(vp, &value);
}