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/* $OpenBSD: db_interface.c,v 1.4 1996/04/18 19:18:06 niklas Exp $ */
/* $NetBSD: db_interface.c,v 1.20 1996/03/15 00:07:18 chuck Exp $ */
/*
* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*
* db_interface.c,v 2.4 1991/02/05 17:11:13 mrt (CMU)
*/
/*
* Interface to new debugger.
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/reboot.h>
#include <sys/systm.h> /* just for boothowto --eichin */
#include <vm/vm.h>
#include <machine/db_machdep.h>
extern label_t *db_recover;
int db_active = 0;
/*
* kdb_trap - field a TRACE or BPT trap
*/
kdb_trap(type, code, regs)
int type, code;
register db_regs_t *regs;
{
int s;
#if 0
if ((boothowto&RB_KDB) == 0)
return(0);
#endif
switch (type) {
case T_BPTFLT: /* breakpoint */
case T_TRCTRAP: /* single_step */
case -1: /* keyboard interrupt */
break;
default:
kdbprinttrap(type, code);
if (db_recover != 0) {
db_error("Faulted in DDB; continuing...\n");
/*NOTREACHED*/
}
}
/* XXX Should switch to kdb`s own stack here. */
ddb_regs = *regs;
if (KERNELMODE(regs->tf_cs, regs->tf_eflags)) {
/*
* Kernel mode - esp and ss not saved
*/
ddb_regs.tf_esp = (int)®s->tf_esp; /* kernel stack pointer */
asm("movw %%ss,%w0" : "=r" (ddb_regs.tf_ss));
}
s = splhigh();
db_active++;
cnpollc(TRUE);
db_trap(type, code);
cnpollc(FALSE);
db_active--;
splx(s);
regs->tf_es = ddb_regs.tf_es;
regs->tf_ds = ddb_regs.tf_ds;
regs->tf_edi = ddb_regs.tf_edi;
regs->tf_esi = ddb_regs.tf_esi;
regs->tf_ebp = ddb_regs.tf_ebp;
regs->tf_ebx = ddb_regs.tf_ebx;
regs->tf_edx = ddb_regs.tf_edx;
regs->tf_ecx = ddb_regs.tf_ecx;
regs->tf_eax = ddb_regs.tf_eax;
regs->tf_eip = ddb_regs.tf_eip;
regs->tf_cs = ddb_regs.tf_cs;
regs->tf_eflags = ddb_regs.tf_eflags;
if (!KERNELMODE(regs->tf_cs, regs->tf_eflags)) {
/* ring transit - saved esp and ss valid */
regs->tf_esp = ddb_regs.tf_esp;
regs->tf_ss = ddb_regs.tf_ss;
}
return (1);
}
extern char *trap_type[];
extern int trap_types;
/*
* Print trap reason.
*/
kdbprinttrap(type, code)
int type, code;
{
db_printf("kernel: ");
if (type >= trap_types || type < 0)
db_printf("type %d", type);
else
db_printf("%s", trap_type[type]);
db_printf(" trap, code=%x\n", code);
}
/*
* Read bytes from kernel address space for debugger.
*/
void
db_read_bytes(addr, size, data)
vm_offset_t addr;
register int size;
register char *data;
{
register char *src;
src = (char *)addr;
while (--size >= 0)
*data++ = *src++;
}
pt_entry_t *pmap_pte __P((pmap_t, vm_offset_t));
/*
* Write bytes to kernel address space for debugger.
*/
void
db_write_bytes(addr, size, data)
vm_offset_t addr;
register int size;
register char *data;
{
register char *dst;
register pt_entry_t *ptep0 = 0;
pt_entry_t oldmap0 = { 0 };
vm_offset_t addr1;
register pt_entry_t *ptep1 = 0;
pt_entry_t oldmap1 = { 0 };
extern char etext;
if (addr >= VM_MIN_KERNEL_ADDRESS &&
addr < (vm_offset_t)&etext) {
ptep0 = pmap_pte(pmap_kernel(), addr);
oldmap0 = *ptep0;
*(int *)ptep0 |= /* INTEL_PTE_WRITE */ PG_RW;
addr1 = i386_trunc_page(addr + size - 1);
if (i386_trunc_page(addr) != addr1) {
/* data crosses a page boundary */
ptep1 = pmap_pte(pmap_kernel(), addr1);
oldmap1 = *ptep1;
*(int *)ptep1 |= /* INTEL_PTE_WRITE */ PG_RW;
}
pmap_update();
}
dst = (char *)addr;
while (--size >= 0)
*dst++ = *data++;
if (ptep0) {
*ptep0 = oldmap0;
if (ptep1)
*ptep1 = oldmap1;
pmap_update();
}
}
void
Debugger()
{
asm("int $3");
}
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