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Machine-dependent portions of remote serial KGDB, for NetBSD/i386. Based

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on Matthias Pfaller's NetBSD/pc532 kgdb_machdep.c.
This commit is contained in:
thorpej 1997-07-05 20:44:57 +00:00
parent 7cf4820f1c
commit f796580395
1 changed files with 227 additions and 0 deletions
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227
sys/arch/i386/i386/kgdb_machdep.c Normal file
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/* $NetBSD: kgdb_machdep.c,v 1.1 1997/07/05 20:44:57 thorpej Exp $ */
/*
* Copyright (c) 1997 Jason R. Thorpe. All rights reserved.
* 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.
*/
#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.
*/
#include <sys/param.h>
#include <sys/kgdb.h>
#include <sys/systm.h>
#include <vm/vm.h>
#include <machine/pte.h>
#include <machine/reg.h>
#include <machine/trap.h>
/* XXX Should be in <machine/pmap.h> */
pt_entry_t *pmap_pte __P((pmap_t, vm_offset_t));
/*
* Determine if the memory at va..(va+len) is valid.
*/
int
kgdb_acc(va, len)
vm_offset_t va;
size_t len;
{
vm_offset_t last_va;
pt_entry_t pte;
last_va = va + len;
va &= ~PGOFSET;
last_va &= ~PGOFSET;
do {
pte = *(pt_entry_t *)pmap_pte(pmap_kernel(), va);
if ((pte & PG_V) == 0)
return (0);
va += NBPG;
} 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:
case T_MACHCHECK:
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;
if (KERNELMODE(regs->tf_cs, regs->tf_eflags)) {
/*
* Kernel mode - esp and ss not saved.
*/
gdb_regs[ 4] = (kgdb_reg_t)&regs->tf_esp; /* kernel stack
pointer */
__asm __volatile("movw %%ss,%w0" : "=r" (gdb_regs[11]));
}
}
/*
* 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);
}
}