NetBSD-5.0.2/sys/arch/sh3/sh3/kgdb_machdep.c
/* $NetBSD: kgdb_machdep.c,v 1.14 2008/04/28 20:23:35 martin Exp $ */
/*-
* Copyright (c) 1997, 2002 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* 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.
*/
/*
* Copyright (c) 1996 Matthias Pfaller.
* All rights reserved.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Matthias Pfaller.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kgdb_machdep.c,v 1.14 2008/04/28 20:23:35 martin Exp $");
#include "opt_ddb.h"
#if defined(DDB)
#error "Can't build DDB and KGDB together."
#endif
/*
* Machine-dependent functions for remote KGDB. Originally written
* for NetBSD/pc532 by Matthias Pfaller. Modified for NetBSD/i386
* by Jason R. Thorpe. Modified for NetBSD/mips by Ethan Solomita.
* Modified for NetBSD/sh3 by UCHIYAMA Yasushi.
*/
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/reboot.h>
#include <sys/kgdb.h>
#include <uvm/uvm_extern.h>
#include <sh3/cpu.h>
#include <machine/db_machdep.h>
#include <ddb/db_access.h>
/*
* Is kva a valid address to access? This is used by KGDB.
*/
static int
kvacc(vaddr_t kva)
{
pt_entry_t *pte;
if (kva < SH3_P1SEG_BASE)
return (0);
if (kva < SH3_P2SEG_BASE)
return (1);
if (kva >= VM_MAX_KERNEL_ADDRESS)
return (0);
/* check kva is kernel virtual. */
if ((kva < VM_MIN_KERNEL_ADDRESS) ||
(kva >= VM_MAX_KERNEL_ADDRESS))
return (0);
/* check page which related kva is valid. */
pte = __pmap_kpte_lookup(kva);
if (!(*pte & PG_V))
return (0);
return (1);
}
/*
* Determine if the memory at va..(va+len) is valid.
*/
int
kgdb_acc(vaddr_t va, size_t len)
{
vaddr_t last_va;
last_va = va + len + PAGE_SIZE - 1;
va &= ~PGOFSET;
last_va &= ~PGOFSET;
for (; va < last_va; va += PAGE_SIZE) {
if (kvacc(va) == 0)
return 0;
}
return (1);
}
/*
* Translate a trap number into a unix compatible signal value.
* (gdb only understands unix signal numbers).
*/
int
kgdb_signal(int type)
{
switch (type) {
case EXPEVT_TLB_MISS_LD:
case EXPEVT_TLB_MISS_ST:
case EXPEVT_TLB_MOD:
case EXPEVT_TLB_PROT_LD:
case EXPEVT_TLB_PROT_ST:
case EXPEVT_ADDR_ERR_LD:
case EXPEVT_ADDR_ERR_ST:
case EXPEVT_TLB_MISS_LD | EXP_USER:
case EXPEVT_TLB_MISS_ST | EXP_USER:
case EXPEVT_TLB_MOD | EXP_USER:
case EXPEVT_TLB_PROT_LD | EXP_USER:
case EXPEVT_TLB_PROT_ST | EXP_USER:
case EXPEVT_ADDR_ERR_LD | EXP_USER:
case EXPEVT_ADDR_ERR_ST | EXP_USER:
return (SIGSEGV);
case EXPEVT_TRAPA:
case EXPEVT_BREAK:
case EXPEVT_TRAPA | EXP_USER:
case EXPEVT_BREAK | EXP_USER:
return (SIGTRAP);
case EXPEVT_RES_INST:
case EXPEVT_SLOT_INST:
case EXPEVT_RES_INST | EXP_USER:
case EXPEVT_SLOT_INST | EXP_USER:
return (SIGILL);
default:
return (SIGEMT);
}
}
/*
* Translate the values stored in the db_regs_t struct to the format
* understood by gdb. (gdb-5.1.1/gdb/config/sh/tm-sh.h)
*/
void
kgdb_getregs(db_regs_t *regs, kgdb_reg_t *gdb_regs)
{
uint32_t r;
memset(gdb_regs, 0, KGDB_NUMREGS * sizeof(kgdb_reg_t));
gdb_regs[ 0] = regs->tf_r0;
gdb_regs[ 1] = regs->tf_r1;
gdb_regs[ 2] = regs->tf_r2;
gdb_regs[ 3] = regs->tf_r3;
gdb_regs[ 4] = regs->tf_r4;
gdb_regs[ 5] = regs->tf_r5;
gdb_regs[ 6] = regs->tf_r6;
gdb_regs[ 7] = regs->tf_r7;
gdb_regs[ 8] = regs->tf_r8;
gdb_regs[ 9] = regs->tf_r9;
gdb_regs[10] = regs->tf_r10;
gdb_regs[11] = regs->tf_r11;
gdb_regs[12] = regs->tf_r12;
gdb_regs[13] = regs->tf_r13;
gdb_regs[14] = regs->tf_r14;
gdb_regs[15] = regs->tf_r15;
gdb_regs[16] = regs->tf_spc;
gdb_regs[17] = regs->tf_pr;
__asm volatile("stc vbr, %0" : "=r"(r));
gdb_regs[19] = r;
gdb_regs[20] = regs->tf_mach;
gdb_regs[21] = regs->tf_macl;
gdb_regs[22] = regs->tf_ssr;
/* How treat register bank 1 ? */
}
/*
* Reverse the above.
*/
void
kgdb_setregs(db_regs_t *regs, kgdb_reg_t *gdb_regs)
{
regs->tf_r0 = gdb_regs[ 0];
regs->tf_r1 = gdb_regs[ 1];
regs->tf_r2 = gdb_regs[ 2];
regs->tf_r3 = gdb_regs[ 3];
regs->tf_r4 = gdb_regs[ 4];
regs->tf_r5 = gdb_regs[ 5];
regs->tf_r6 = gdb_regs[ 6];
regs->tf_r7 = gdb_regs[ 7];
regs->tf_r8 = gdb_regs[ 8];
regs->tf_r9 = gdb_regs[ 9];
regs->tf_r10 = gdb_regs[10];
regs->tf_r11 = gdb_regs[11];
regs->tf_r12 = gdb_regs[12];
regs->tf_r13 = gdb_regs[13];
regs->tf_r14 = gdb_regs[14];
regs->tf_r15 = gdb_regs[15];
regs->tf_spc = gdb_regs[16];
regs->tf_pr = gdb_regs[17];
__asm volatile("ldc %0, vbr" :: "r"(gdb_regs[19]));
regs->tf_mach = gdb_regs[20];
regs->tf_macl = gdb_regs[21];
regs->tf_ssr = gdb_regs[22];
}
/*
* Trap into kgdb to wait for debugger to connect,
* noting on the console why nothing else is going on.
*/
void
kgdb_connect(int verbose)
{
if (kgdb_dev < 0) {
printf("kgdb_dev=%d\n", kgdb_dev);
return;
}
if (verbose)
printf("kgdb waiting...");
__asm volatile("trapa %0" :: "i"(_SH_TRA_BREAK));
if (verbose)
printf("connected.\n");
kgdb_debug_panic = 1;
}
/*
* Decide what to do on panic.
* (This is called by panic, like Debugger())
*/
void
kgdb_panic()
{
if (kgdb_dev >= 0 && kgdb_debug_panic) {
printf("entering kgdb\n");
kgdb_connect(kgdb_active == 0);
}
}