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/* $OpenBSD: db_interface.c,v 1.10 2002/02/18 23:26:18 mickey Exp $ */
/* $NetBSD: db_interface.c,v 1.22 1996/05/03 19:42:00 christos 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 Mellon
* the rights to redistribute these changes.
*
* db_interface.c,v 2.4 1991/02/05 17:11:13 mrt (CMU)
*/
/*
* Interface to new debugger.
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <sys/systm.h>
#include <uvm/uvm_extern.h>
#include <dev/cons.h>
#include <machine/db_machdep.h>
#include <ddb/db_sym.h>
#include <ddb/db_command.h>
#include <ddb/db_extern.h>
#include <ddb/db_access.h>
#include <ddb/db_output.h>
#include <ddb/db_var.h>
extern label_t *db_recover;
extern char *trap_type[];
extern int trap_types;
int db_active = 0;
void kdbprinttrap __P((int, int));
/*
* Print trap reason.
*/
void
kdbprinttrap(type, code)
int type, code;
{
db_printf("kernel: ");
if (type >= trap_types || type < 0)
db_printf("type %d", type);
else
db_printf("%s", trap_type[type]);
db_printf(" trap, code=%x\n", code);
}
/*
* kdb_trap - field a TRACE or BPT trap
*/
int
kdb_trap(type, code, regs)
int type, code;
db_regs_t *regs;
{
int s;
switch (type) {
case T_BPTFLT: /* breakpoint */
case T_TRCTRAP: /* single_step */
case T_NMI: /* NMI */
case -1: /* keyboard interrupt */
break;
default:
if (!db_panic)
return (0);
kdbprinttrap(type, code);
if (db_recover != 0) {
db_error("Faulted in DDB; continuing...\n");
/*NOTREACHED*/
}
}
/* XXX Should switch to kdb`s own stack here. */
ddb_regs = *regs;
if (KERNELMODE(regs->tf_cs, regs->tf_eflags)) {
/*
* Kernel mode - esp and ss not saved
*/
ddb_regs.tf_esp = (int)®s->tf_esp; /* kernel stack pointer */
asm("movw %%ss,%w0" : "=r" (ddb_regs.tf_ss));
}
s = splhigh();
db_active++;
cnpollc(TRUE);
db_trap(type, code);
cnpollc(FALSE);
db_active--;
splx(s);
regs->tf_es = ddb_regs.tf_es & 0xffff;
regs->tf_ds = ddb_regs.tf_ds & 0xffff;
regs->tf_edi = ddb_regs.tf_edi;
regs->tf_esi = ddb_regs.tf_esi;
regs->tf_ebp = ddb_regs.tf_ebp;
regs->tf_ebx = ddb_regs.tf_ebx;
regs->tf_edx = ddb_regs.tf_edx;
regs->tf_ecx = ddb_regs.tf_ecx;
regs->tf_eax = ddb_regs.tf_eax;
regs->tf_eip = ddb_regs.tf_eip;
regs->tf_cs = ddb_regs.tf_cs & 0xffff;
regs->tf_eflags = ddb_regs.tf_eflags;
if (!KERNELMODE(regs->tf_cs, regs->tf_eflags)) {
/* ring transit - saved esp and ss valid */
regs->tf_esp = ddb_regs.tf_esp;
regs->tf_ss = ddb_regs.tf_ss & 0xffff;
}
return (1);
}
void
Debugger()
{
asm("int $3");
}
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