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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* Copyright 2018 Joyent, Inc.
*/
/*
* Intel-specific portions of the DPI
*/
#include <sys/types.h>
#include <sys/trap.h>
#include <kmdb/kmdb_dpi_impl.h>
#include <kmdb/kmdb_fault.h>
#include <kmdb/kmdb_kdi.h>
#include <mdb/mdb_err.h>
#include <mdb/mdb_debug.h>
#include <mdb/mdb_kreg.h>
#include <mdb/mdb.h>
void
kmdb_dpi_handle_fault(kreg_t trapno, kreg_t pc, kreg_t sp, int cpuid)
{
kmdb_kdi_system_claim();
mdb_dprintf(MDB_DBG_DPI, "\ndpi_handle_fault: trapno %u, pc 0x%0?p, "
"sp 0x%0?p\n", (int)trapno, pc, sp);
switch (trapno) {
case T_GPFLT:
errno = EACCES;
break;
default:
errno = EMDB_NOMAP;
}
if (kmdb_dpi_fault_pcb != NULL) {
longjmp(*kmdb_dpi_fault_pcb, 1);
/*NOTREACHED*/
}
/* Debugger fault */
kmdb_fault(trapno, pc, sp, cpuid);
}
/*ARGSUSED*/
int
kmdb_dpi_get_register(const char *regname, kreg_t *kregp)
{
return (mdb.m_dpi->dpo_get_register(regname, kregp));
}
/*ARGSUSED*/
int
kmdb_dpi_set_register(const char *regname, kreg_t kreg)
{
return (mdb.m_dpi->dpo_set_register(regname, kreg));
}
/*
* Continue/resume handling. If the target calls kmdb_dpi_resume(), it
* expects that the world will be resumed, and that the call will return
* when the world has stopped again.
*
* For support, we have resume_return(), which is called from main() when
* the continuation has completed (when the world has stopped again).
* set_resume_exit() tells where to jump to actually restart the world.
*
* CAUTION: This routine may be called *after* mdb_destroy.
*/
void
kmdb_dpi_resume_common(int cmd)
{
kreg_t pc, trapno;
ASSERT(kmdb_dpi_resume_requested == 0);
if (setjmp(kmdb_dpi_resume_pcb) == 0) {
(void) kmdb_dpi_get_register("pc", &pc);
mdb_dprintf(MDB_DBG_PROC, "Resume requested, pc is %p\n",
(void *)pc);
if (cmd != KMDB_DPI_CMD_RESUME_UNLOAD)
kmdb_dpi_resume_requested = 1;
longjmp(kmdb_dpi_entry_pcb, cmd);
/*NOTREACHED*/
} else {
(void) kmdb_dpi_get_register("pc", &pc);
(void) kmdb_dpi_get_register("trapno", &trapno);
mdb_dprintf(MDB_DBG_PROC, "Back from resume, pc: %p, "
"trapno: %u\n", (void *)pc, (int)trapno);
kmdb_dpi_resume_requested = 0;
switch (trapno) {
case T_BPTFLT:
kmdb_dpi_set_state(DPI_STATE_FAULTED,
DPI_STATE_WHY_BKPT);
break;
case T_DBGENTR:
kmdb_dpi_set_state(DPI_STATE_STOPPED, 0);
break;
default:
kmdb_dpi_set_state(DPI_STATE_FAULTED,
DPI_STATE_WHY_TRAP);
break;
}
}
mdb_dprintf(MDB_DBG_PROC, "returning from resume\n");
}
void
kmdb_dpi_reboot(void)
{
/*
* We're going to skip all of the niceties we employ in resume_common,
* as we don't plan to ever return.
*/
longjmp(kmdb_dpi_entry_pcb, KMDB_DPI_CMD_REBOOT);
}
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