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freebsd/sys/ddb/db_break.c
Rodney W. Grimes 5b81b6b301 Initial import, 0.1 + pk 0.2.4-B1
1993-06-12 14:58:17 +00:00

388 lines
8.0 KiB
C
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/*
* 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
* 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 the
* rights to redistribute these changes.
*/
/*
* HISTORY
* $Log: db_break.c,v $
* Revision 1.1 1992/03/25 21:44:57 pace
* Initial revision
*
* Revision 2.7 91/02/05 17:06:00 mrt
* Changed to new Mach copyright
* [91/01/31 16:17:01 mrt]
*
* Revision 2.6 91/01/08 15:09:03 rpd
* Added db_map_equal, db_map_current, db_map_addr.
* [90/11/10 rpd]
*
* Revision 2.5 90/11/05 14:26:32 rpd
* Initialize db_breakpoints_inserted to TRUE.
* [90/11/04 rpd]
*
* Revision 2.4 90/10/25 14:43:33 rwd
* Added map field to breakpoints.
* Added map argument to db_set_breakpoint, db_delete_breakpoint,
* db_find_breakpoint. Added db_find_breakpoint_here.
* [90/10/18 rpd]
*
* Revision 2.3 90/09/28 16:57:07 jsb
* Fixed db_breakpoint_free.
* [90/09/18 rpd]
*
* Revision 2.2 90/08/27 21:49:53 dbg
* Reflected changes in db_printsym()'s calling seq.
* [90/08/20 af]
* Clear breakpoints only if inserted.
* Reduce lint.
* [90/08/07 dbg]
* Created.
* [90/07/25 dbg]
*
*/
/*
* Author: David B. Golub, Carnegie Mellon University
* Date: 7/90
*/
/*
* Breakpoints.
*/
#include "param.h"
#include "proc.h"
#include <machine/db_machdep.h> /* type definitions */
#include <ddb/db_lex.h>
#include <ddb/db_break.h>
#include <ddb/db_access.h>
#include <ddb/db_sym.h>
#include <ddb/db_break.h>
extern boolean_t db_map_equal();
extern boolean_t db_map_current();
extern vm_map_t db_map_addr();
#define NBREAKPOINTS 100
struct db_breakpoint db_break_table[NBREAKPOINTS];
db_breakpoint_t db_next_free_breakpoint = &db_break_table[0];
db_breakpoint_t db_free_breakpoints = 0;
db_breakpoint_t db_breakpoint_list = 0;
db_breakpoint_t
db_breakpoint_alloc()
{
register db_breakpoint_t bkpt;
if ((bkpt = db_free_breakpoints) != 0) {
db_free_breakpoints = bkpt->link;
return (bkpt);
}
if (db_next_free_breakpoint == &db_break_table[NBREAKPOINTS]) {
db_printf("All breakpoints used.\n");
return (0);
}
bkpt = db_next_free_breakpoint;
db_next_free_breakpoint++;
return (bkpt);
}
void
db_breakpoint_free(bkpt)
register db_breakpoint_t bkpt;
{
bkpt->link = db_free_breakpoints;
db_free_breakpoints = bkpt;
}
void
db_set_breakpoint(map, addr, count)
vm_map_t map;
db_addr_t addr;
int count;
{
register db_breakpoint_t bkpt;
if (db_find_breakpoint(map, addr)) {
db_printf("Already set.\n");
return;
}
bkpt = db_breakpoint_alloc();
if (bkpt == 0) {
db_printf("Too many breakpoints.\n");
return;
}
bkpt->map = map;
bkpt->address = addr;
bkpt->flags = 0;
bkpt->init_count = count;
bkpt->count = count;
bkpt->link = db_breakpoint_list;
db_breakpoint_list = bkpt;
}
void
db_delete_breakpoint(map, addr)
vm_map_t map;
db_addr_t addr;
{
register db_breakpoint_t bkpt;
register db_breakpoint_t *prev;
for (prev = &db_breakpoint_list;
(bkpt = *prev) != 0;
prev = &bkpt->link) {
if (db_map_equal(bkpt->map, map) &&
(bkpt->address == addr)) {
*prev = bkpt->link;
break;
}
}
if (bkpt == 0) {
db_printf("Not set.\n");
return;
}
db_breakpoint_free(bkpt);
}
db_breakpoint_t
db_find_breakpoint(map, addr)
vm_map_t map;
db_addr_t addr;
{
register db_breakpoint_t bkpt;
for (bkpt = db_breakpoint_list;
bkpt != 0;
bkpt = bkpt->link)
{
if (db_map_equal(bkpt->map, map) &&
(bkpt->address == addr))
return (bkpt);
}
return (0);
}
db_breakpoint_t
db_find_breakpoint_here(addr)
db_addr_t addr;
{
return db_find_breakpoint(db_map_addr(addr), addr);
}
boolean_t db_breakpoints_inserted = TRUE;
void
db_set_breakpoints()
{
register db_breakpoint_t bkpt;
if (!db_breakpoints_inserted) {
for (bkpt = db_breakpoint_list;
bkpt != 0;
bkpt = bkpt->link)
if (db_map_current(bkpt->map)) {
bkpt->bkpt_inst = db_get_value(bkpt->address,
BKPT_SIZE,
FALSE);
db_put_value(bkpt->address,
BKPT_SIZE,
BKPT_SET(bkpt->bkpt_inst));
}
db_breakpoints_inserted = TRUE;
}
}
void
db_clear_breakpoints()
{
register db_breakpoint_t bkpt;
if (db_breakpoints_inserted) {
for (bkpt = db_breakpoint_list;
bkpt != 0;
bkpt = bkpt->link)
if (db_map_current(bkpt->map)) {
db_put_value(bkpt->address, BKPT_SIZE, bkpt->bkpt_inst);
}
db_breakpoints_inserted = FALSE;
}
}
/*
* Set a temporary breakpoint.
* The instruction is changed immediately,
* so the breakpoint does not have to be on the breakpoint list.
*/
db_breakpoint_t
db_set_temp_breakpoint(addr)
db_addr_t addr;
{
register db_breakpoint_t bkpt;
bkpt = db_breakpoint_alloc();
if (bkpt == 0) {
db_printf("Too many breakpoints.\n");
return 0;
}
bkpt->map = NULL;
bkpt->address = addr;
bkpt->flags = BKPT_TEMP;
bkpt->init_count = 1;
bkpt->count = 1;
bkpt->bkpt_inst = db_get_value(bkpt->address, BKPT_SIZE, FALSE);
db_put_value(bkpt->address, BKPT_SIZE, BKPT_SET(bkpt->bkpt_inst));
return bkpt;
}
void
db_delete_temp_breakpoint(bkpt)
db_breakpoint_t bkpt;
{
db_put_value(bkpt->address, BKPT_SIZE, bkpt->bkpt_inst);
db_breakpoint_free(bkpt);
}
/*
* List breakpoints.
*/
void
db_list_breakpoints()
{
register db_breakpoint_t bkpt;
if (db_breakpoint_list == 0) {
db_printf("No breakpoints set\n");
return;
}
db_printf(" Map Count Address\n");
for (bkpt = db_breakpoint_list;
bkpt != 0;
bkpt = bkpt->link)
{
db_printf("%s%8x %5d ",
db_map_current(bkpt->map) ? "*" : " ",
bkpt->map, bkpt->init_count);
db_printsym(bkpt->address, DB_STGY_PROC);
db_printf("\n");
}
}
/* Delete breakpoint */
/*ARGSUSED*/
void
db_delete_cmd(addr, have_addr, count, modif)
db_expr_t addr;
int have_addr;
db_expr_t count;
char * modif;
{
db_delete_breakpoint(db_map_addr(addr), (db_addr_t)addr);
}
/* Set breakpoint with skip count */
/*ARGSUSED*/
void
db_breakpoint_cmd(addr, have_addr, count, modif)
db_expr_t addr;
int have_addr;
db_expr_t count;
char * modif;
{
if (count == -1)
count = 1;
db_set_breakpoint(db_map_addr(addr), (db_addr_t)addr, count);
}
/* list breakpoints */
void
db_listbreak_cmd()
{
db_list_breakpoints();
}
#include <vm/vm_kern.h>
/*
* We want ddb to be usable before most of the kernel has been
* initialized. In particular, current_thread() or kernel_map
* (or both) may be null.
*/
boolean_t
db_map_equal(map1, map2)
vm_map_t map1, map2;
{
return ((map1 == map2) ||
((map1 == NULL) && (map2 == kernel_map)) ||
((map1 == kernel_map) && (map2 == NULL)));
}
boolean_t
db_map_current(map)
vm_map_t map;
{
#if 0
thread_t thread;
return ((map == NULL) ||
(map == kernel_map) ||
(((thread = current_thread()) != NULL) &&
(map == thread->task->map)));
#else
return (1);
#endif
}
vm_map_t
db_map_addr(addr)
vm_offset_t addr;
{
#if 0
thread_t thread;
/*
* We want to return kernel_map for all
* non-user addresses, even when debugging
* kernel tasks with their own maps.
*/
if ((VM_MIN_ADDRESS <= addr) &&
(addr < VM_MAX_ADDRESS) &&
((thread = current_thread()) != NULL))
return thread->task->map;
else
#endif
return kernel_map;
}
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