NetBSD-5.0.2/sys/arch/alpha/alpha/kgdb_machdep.c
/* $NetBSD: kgdb_machdep.c,v 1.5 2008/04/28 20:23:10 martin Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Machine-dependent functions for remote KGDB.
*/
#include "opt_kgdb.h"
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: kgdb_machdep.c,v 1.5 2008/04/28 20:23:10 martin Exp $");
#include "com.h"
#include <sys/param.h>
#include <sys/kgdb.h>
#include <sys/systm.h>
#include <sys/termios.h>
#include <machine/bus.h>
#include <machine/db_machdep.h>
#include <uvm/uvm_extern.h>
#if NCOM > 0
#include <dev/ic/comreg.h>
#include <dev/ic/comvar.h>
#endif /* NCOM > 0 */
#ifndef KGDB_DEVNAME
#error Must define KGDB_DEVNAME
#endif
const char kgdb_devname[] = KGDB_DEVNAME;
#ifndef KGDB_DEVADDR
#error Must define KGDB_DEVADDR
#endif
int kgdb_devaddr = KGDB_DEVADDR;
#ifndef KGDB_DEVRATE
#define KGDB_DEVRATE TTYDEF_SPEED
#endif
int kgdb_devrate = KGDB_DEVRATE;
#ifndef KGDB_DEVMODE
/* 8N1 */
#define KGDB_DEVMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8)
#endif
int kgdb_devmode = KGDB_DEVMODE;
/*
* alpha_kgdb_init:
*
* Initialize KGDB -- connect to the device.
*/
void
alpha_kgdb_init(const char **valid_devs, struct alpha_bus_space *bst)
{
int i;
for (i = 0; valid_devs[i] != NULL; i++) {
if (strcmp(kgdb_devname, valid_devs[i]) == 0)
break;
}
if (valid_devs[i] == NULL) {
printf("%s is not a valid KGDB device for this platform\n",
kgdb_devname);
return;
}
#if NCOM > 0
if (strcmp(kgdb_devname, "com") == 0) {
com_kgdb_attach(bst, kgdb_devaddr, kgdb_devrate, COM_FREQ,
COM_TYPE_NORMAL, kgdb_devmode);
return;
}
#endif /* NCOM > 0 */
printf("The %s driver is not configured into the kernel; "
"KGDB not attached\n", kgdb_devname);
}
/*
* kgdb_acc:
*
* Determine if the mapping at va..(va+len) is valid.
*/
int
kgdb_acc(vaddr_t va, size_t len)
{
vaddr_t last_va;
pt_entry_t *pte;
va = trunc_page(va);
last_va = round_page(va + len);
do {
if (va < VM_MIN_KERNEL_ADDRESS)
return (0);
pte = pmap_l3pte(pmap_kernel(), va, NULL);
if (pte == NULL || pmap_pte_v(pte) == 0)
return (0);
va += PAGE_SIZE;
} while (va < last_va);
return (1);
}
/*
* kgdb_signal:
*
* Translate a trap number into a Unix-compatible signal number.
* (GDB only understands Unix signal numbers.)
*/
int
kgdb_signal(int type)
{
switch (type) {
case ALPHA_KENTRY_UNA:
return (SIGBUS);
case ALPHA_KENTRY_ARITH:
return (SIGFPE);
case ALPHA_KENTRY_IF:
return (SIGILL);
case ALPHA_KENTRY_MM:
return (SIGSEGV);
default:
return (SIGEMT);
}
}
/*
* kgdb_getregs:
*
* Translate the kernel debugger register format into
* the GDB register format.
*/
void
kgdb_getregs(db_regs_t *regs, kgdb_reg_t *gdb_regs)
{
memset(gdb_regs, 0, sizeof(kgdb_reg_t) * KGDB_NUMREGS);
gdb_regs[KGDB_REG_V0 ] = regs->tf_regs[FRAME_V0];
gdb_regs[KGDB_REG_T0 ] = regs->tf_regs[FRAME_T0];
gdb_regs[KGDB_REG_T1 ] = regs->tf_regs[FRAME_T1];
gdb_regs[KGDB_REG_T2 ] = regs->tf_regs[FRAME_T2];
gdb_regs[KGDB_REG_T3 ] = regs->tf_regs[FRAME_T3];
gdb_regs[KGDB_REG_T4 ] = regs->tf_regs[FRAME_T4];
gdb_regs[KGDB_REG_T5 ] = regs->tf_regs[FRAME_T5];
gdb_regs[KGDB_REG_T6 ] = regs->tf_regs[FRAME_T6];
gdb_regs[KGDB_REG_T7 ] = regs->tf_regs[FRAME_T7];
gdb_regs[KGDB_REG_S0 ] = regs->tf_regs[FRAME_S0];
gdb_regs[KGDB_REG_S1 ] = regs->tf_regs[FRAME_S1];
gdb_regs[KGDB_REG_S2 ] = regs->tf_regs[FRAME_S2];
gdb_regs[KGDB_REG_S3 ] = regs->tf_regs[FRAME_S3];
gdb_regs[KGDB_REG_S4 ] = regs->tf_regs[FRAME_S4];
gdb_regs[KGDB_REG_S5 ] = regs->tf_regs[FRAME_S5];
gdb_regs[KGDB_REG_S6 ] = regs->tf_regs[FRAME_S6];
gdb_regs[KGDB_REG_A0 ] = regs->tf_regs[FRAME_A0];
gdb_regs[KGDB_REG_A1 ] = regs->tf_regs[FRAME_A1];
gdb_regs[KGDB_REG_A2 ] = regs->tf_regs[FRAME_A2];
gdb_regs[KGDB_REG_A3 ] = regs->tf_regs[FRAME_A3];
gdb_regs[KGDB_REG_A4 ] = regs->tf_regs[FRAME_A4];
gdb_regs[KGDB_REG_A5 ] = regs->tf_regs[FRAME_A5];
gdb_regs[KGDB_REG_T8 ] = regs->tf_regs[FRAME_T8];
gdb_regs[KGDB_REG_T9 ] = regs->tf_regs[FRAME_T9];
gdb_regs[KGDB_REG_T10] = regs->tf_regs[FRAME_T10];
gdb_regs[KGDB_REG_T11] = regs->tf_regs[FRAME_T11];
gdb_regs[KGDB_REG_RA ] = regs->tf_regs[FRAME_RA];
gdb_regs[KGDB_REG_T12] = regs->tf_regs[FRAME_T12];
gdb_regs[KGDB_REG_AT ] = regs->tf_regs[FRAME_AT];
gdb_regs[KGDB_REG_GP ] = regs->tf_regs[FRAME_GP];
gdb_regs[KGDB_REG_SP ] = regs->tf_regs[FRAME_SP];
gdb_regs[KGDB_REG_PC ] = regs->tf_regs[FRAME_PC];
}
/*
* kgdb_setregs:
*
* Translate the GDB register format into the kernel
* debugger register format.
*/
void
kgdb_setregs(db_regs_t *regs, kgdb_reg_t *gdb_regs)
{
regs->tf_regs[FRAME_V0 ] = gdb_regs[KGDB_REG_V0];
regs->tf_regs[FRAME_T0 ] = gdb_regs[KGDB_REG_T0];
regs->tf_regs[FRAME_T1 ] = gdb_regs[KGDB_REG_T1];
regs->tf_regs[FRAME_T2 ] = gdb_regs[KGDB_REG_T2];
regs->tf_regs[FRAME_T3 ] = gdb_regs[KGDB_REG_T3];
regs->tf_regs[FRAME_T4 ] = gdb_regs[KGDB_REG_T4];
regs->tf_regs[FRAME_T5 ] = gdb_regs[KGDB_REG_T5];
regs->tf_regs[FRAME_T6 ] = gdb_regs[KGDB_REG_T6];
regs->tf_regs[FRAME_T7 ] = gdb_regs[KGDB_REG_T7];
regs->tf_regs[FRAME_S0 ] = gdb_regs[KGDB_REG_S0];
regs->tf_regs[FRAME_S1 ] = gdb_regs[KGDB_REG_S1];
regs->tf_regs[FRAME_S2 ] = gdb_regs[KGDB_REG_S2];
regs->tf_regs[FRAME_S3 ] = gdb_regs[KGDB_REG_S3];
regs->tf_regs[FRAME_S4 ] = gdb_regs[KGDB_REG_S4];
regs->tf_regs[FRAME_S5 ] = gdb_regs[KGDB_REG_S5];
regs->tf_regs[FRAME_S6 ] = gdb_regs[KGDB_REG_S6];
regs->tf_regs[FRAME_A0 ] = gdb_regs[KGDB_REG_A0];
regs->tf_regs[FRAME_A1 ] = gdb_regs[KGDB_REG_A1];
regs->tf_regs[FRAME_A2 ] = gdb_regs[KGDB_REG_A2];
regs->tf_regs[FRAME_A3 ] = gdb_regs[KGDB_REG_A3];
regs->tf_regs[FRAME_A4 ] = gdb_regs[KGDB_REG_A4];
regs->tf_regs[FRAME_A5 ] = gdb_regs[KGDB_REG_A5];
regs->tf_regs[FRAME_T8 ] = gdb_regs[KGDB_REG_T8];
regs->tf_regs[FRAME_T9 ] = gdb_regs[KGDB_REG_T9];
regs->tf_regs[FRAME_T10] = gdb_regs[KGDB_REG_T10];
regs->tf_regs[FRAME_T11] = gdb_regs[KGDB_REG_T11];
regs->tf_regs[FRAME_RA ] = gdb_regs[KGDB_REG_RA];
regs->tf_regs[FRAME_T12] = gdb_regs[KGDB_REG_T12];
regs->tf_regs[FRAME_AT ] = gdb_regs[KGDB_REG_AT];
regs->tf_regs[FRAME_GP ] = gdb_regs[KGDB_REG_GP];
regs->tf_regs[FRAME_SP ] = gdb_regs[KGDB_REG_SP];
regs->tf_regs[FRAME_PC ] = gdb_regs[KGDB_REG_PC];
}
/*
* kgdb_connect:
*
* Trap into KGDB and wait for the remote debugger to
* connect. Display a message on the console indicating
* why nothing else is happening.
*/
void
kgdb_connect(int verbose)
{
if (kgdb_dev < 0)
return;
if (verbose)
printf("kgdb waiting...");
__asm volatile("call_pal 0x81"); /* bugchk */
if (verbose)
printf("connected.\n");
kgdb_debug_panic = 1;
}
/*
* kgdb_panic:
*
* Decide what to do on panic. (This is called by panic(),
* like Debugger().)
*/
void
kgdb_panic(void)
{
if (kgdb_dev >= 0 && kgdb_debug_panic) {
printf("entering kgdb\n");
kgdb_connect(kgdb_active == 0);
}
}