NetBSD-5.0.2/sys/arch/i386/i386/kgdb_machdep.c
/* $NetBSD: kgdb_machdep.c,v 1.18 2008/06/24 16:28:44 ad Exp $ */
/*-
* Copyright (c) 1997 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 1.18 2008/06/24 16:28:44 ad Exp $");
#include "opt_ddb.h"
/*
* Machine-dependent functions for remote KGDB. Originally written
* for NetBSD/pc532 by Matthias Pfaller. Modified for NetBSD/i386
* by Jason R. Thorpe.
*/
#include <sys/param.h>
#include <sys/kgdb.h>
#include <sys/systm.h>
#include <uvm/uvm_extern.h>
#include <machine/pte.h>
#include <machine/reg.h>
#include <machine/trap.h>
/*
* Determine if the memory at va..(va+len) is valid.
*/
int
kgdb_acc(va, len)
vaddr_t va;
size_t len;
{
vaddr_t last_va;
pt_entry_t *pte;
last_va = va + len;
va &= ~PGOFSET;
last_va &= ~PGOFSET;
do {
if (va < VM_MIN_KERNEL_ADDRESS)
pte = vtopte(va);
else
pte = kvtopte(va);
if ((*pte & PG_V) == 0)
return (0);
if (*pte & PG_PS)
va = (va & PG_LGFRAME) + NBPD_L2;
else
va += PAGE_SIZE;
} while (va < last_va);
return (1);
}
/*
* Translate a trap number into a unix compatible signal value.
* (gdb only understands unix signal numbers).
*/
int
kgdb_signal(type)
int type;
{
switch (type) {
case T_NMI:
return (SIGINT);
case T_ALIGNFLT:
return (SIGILL);
case T_BPTFLT:
case T_TRCTRAP:
return (SIGTRAP);
case T_ASTFLT:
case T_DOUBLEFLT:
return (SIGEMT);
case T_ARITHTRAP:
case T_DIVIDE:
case T_OFLOW:
case T_DNA:
case T_FPOPFLT:
return (SIGFPE);
case T_PRIVINFLT:
case T_PROTFLT:
case T_PAGEFLT:
case T_TSSFLT:
case T_SEGNPFLT:
case T_STKFLT:
return (SIGSEGV);
case T_BOUND:
return (SIGURG);
default:
return (SIGEMT);
}
}
/*
* Translate the values stored in the kernel regs struct to the format
* understood by gdb.
*/
void
kgdb_getregs(regs, gdb_regs)
db_regs_t *regs;
kgdb_reg_t *gdb_regs;
{
gdb_regs[ 0] = regs->tf_eax;
gdb_regs[ 1] = regs->tf_ecx;
gdb_regs[ 2] = regs->tf_edx;
gdb_regs[ 3] = regs->tf_ebx;
gdb_regs[ 5] = regs->tf_ebp;
gdb_regs[ 6] = regs->tf_esi;
gdb_regs[ 7] = regs->tf_edi;
gdb_regs[ 8] = regs->tf_eip;
gdb_regs[ 9] = regs->tf_eflags;
gdb_regs[10] = regs->tf_cs;
gdb_regs[12] = regs->tf_ds;
gdb_regs[13] = regs->tf_es;
gdb_regs[14] = regs->tf_fs;
gdb_regs[15] = regs->tf_gs;
if (KERNELMODE(regs->tf_cs, regs->tf_eflags)) {
/*
* Kernel mode - esp and ss not saved.
*/
gdb_regs[ 4] = (kgdb_reg_t)®s->tf_esp; /* kernel stack
pointer */
gdb_regs[11] = x86_getss();
}
}
/*
* Reverse the above.
*/
void
kgdb_setregs(regs, gdb_regs)
db_regs_t *regs;
kgdb_reg_t *gdb_regs;
{
regs->tf_eax = gdb_regs[ 0];
regs->tf_ecx = gdb_regs[ 1];
regs->tf_edx = gdb_regs[ 2];
regs->tf_ebx = gdb_regs[ 3];
regs->tf_ebp = gdb_regs[ 5];
regs->tf_esi = gdb_regs[ 6];
regs->tf_edi = gdb_regs[ 7];
regs->tf_eip = gdb_regs[ 8];
regs->tf_eflags = gdb_regs[ 9];
regs->tf_cs = gdb_regs[10];
regs->tf_ds = gdb_regs[12];
regs->tf_es = gdb_regs[13];
if (KERNELMODE(regs->tf_cs, regs->tf_eflags) == 0) {
/*
* Trapped in user mode - restore esp and ss.
*/
regs->tf_esp = gdb_regs[ 4];
regs->tf_ss = gdb_regs[11];
}
}
/*
* Trap into kgdb to wait for debugger to connect,
* noting on the console why nothing else is going on.
*/
void
kgdb_connect(verbose)
int verbose;
{
if (kgdb_dev < 0)
return;
if (verbose)
printf("kgdb waiting...");
breakpoint();
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);
}
}