295 lines
6.2 KiB
C
295 lines
6.2 KiB
C
/*
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* Mach Operating System
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* Copyright (c) 1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*
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* HISTORY
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* $Log: db_watch.c,v $
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* Revision 1.1 1992/03/25 21:45:37 pace
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* Initial revision
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*
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* Revision 2.5 91/02/05 17:07:27 mrt
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* Changed to new Mach copyright
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* [91/01/31 16:20:02 mrt]
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*
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* Revision 2.4 91/01/08 15:09:24 rpd
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* Use db_map_equal, db_map_current, db_map_addr.
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* [90/11/10 rpd]
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*
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* Revision 2.3 90/11/05 14:26:39 rpd
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* Initialize db_watchpoints_inserted to TRUE.
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* [90/11/04 rpd]
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*
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* Revision 2.2 90/10/25 14:44:16 rwd
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* Made db_watchpoint_cmd parse a size argument.
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* [90/10/17 rpd]
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* Generalized the watchpoint support.
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* [90/10/16 rwd]
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* Created.
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* [90/10/16 rpd]
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*
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*/
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/*
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* Author: Richard P. Draves, Carnegie Mellon University
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* Date: 10/90
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*/
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#include "param.h"
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#include "proc.h"
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#include <machine/db_machdep.h>
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#include <vm/vm_map.h>
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#include <ddb/db_lex.h>
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#include <ddb/db_watch.h>
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#include <ddb/db_access.h>
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#include <ddb/db_sym.h>
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#include <machine/db_machdep.h>
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/*
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* Watchpoints.
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*/
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extern boolean_t db_map_equal();
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extern boolean_t db_map_current();
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extern vm_map_t db_map_addr();
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boolean_t db_watchpoints_inserted = TRUE;
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#define NWATCHPOINTS 100
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struct db_watchpoint db_watch_table[NWATCHPOINTS];
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db_watchpoint_t db_next_free_watchpoint = &db_watch_table[0];
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db_watchpoint_t db_free_watchpoints = 0;
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db_watchpoint_t db_watchpoint_list = 0;
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db_watchpoint_t
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db_watchpoint_alloc()
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{
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register db_watchpoint_t watch;
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if ((watch = db_free_watchpoints) != 0) {
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db_free_watchpoints = watch->link;
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return (watch);
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}
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if (db_next_free_watchpoint == &db_watch_table[NWATCHPOINTS]) {
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db_printf("All watchpoints used.\n");
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return (0);
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}
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watch = db_next_free_watchpoint;
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db_next_free_watchpoint++;
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return (watch);
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}
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void
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db_watchpoint_free(watch)
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register db_watchpoint_t watch;
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{
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watch->link = db_free_watchpoints;
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db_free_watchpoints = watch;
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}
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void
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db_set_watchpoint(map, addr, size)
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vm_map_t map;
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db_addr_t addr;
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vm_size_t size;
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{
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register db_watchpoint_t watch;
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if (map == NULL) {
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db_printf("No map.\n");
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return;
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}
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/*
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* Should we do anything fancy with overlapping regions?
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*/
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for (watch = db_watchpoint_list;
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watch != 0;
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watch = watch->link)
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if (db_map_equal(watch->map, map) &&
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(watch->loaddr == addr) &&
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(watch->hiaddr == addr+size)) {
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db_printf("Already set.\n");
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return;
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}
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watch = db_watchpoint_alloc();
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if (watch == 0) {
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db_printf("Too many watchpoints.\n");
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return;
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}
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watch->map = map;
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watch->loaddr = addr;
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watch->hiaddr = addr+size;
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watch->link = db_watchpoint_list;
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db_watchpoint_list = watch;
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db_watchpoints_inserted = FALSE;
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}
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void
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db_delete_watchpoint(map, addr)
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vm_map_t map;
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db_addr_t addr;
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{
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register db_watchpoint_t watch;
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register db_watchpoint_t *prev;
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for (prev = &db_watchpoint_list;
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(watch = *prev) != 0;
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prev = &watch->link)
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if (db_map_equal(watch->map, map) &&
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(watch->loaddr <= addr) &&
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(addr < watch->hiaddr)) {
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*prev = watch->link;
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db_watchpoint_free(watch);
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return;
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}
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db_printf("Not set.\n");
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}
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void
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db_list_watchpoints()
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{
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register db_watchpoint_t watch;
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if (db_watchpoint_list == 0) {
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db_printf("No watchpoints set\n");
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return;
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}
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db_printf(" Map Address Size\n");
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for (watch = db_watchpoint_list;
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watch != 0;
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watch = watch->link)
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db_printf("%s%8x %8x %x\n",
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db_map_current(watch->map) ? "*" : " ",
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watch->map, watch->loaddr,
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watch->hiaddr - watch->loaddr);
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}
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/* Delete watchpoint */
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/*ARGSUSED*/
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void
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db_deletewatch_cmd(addr, have_addr, count, modif)
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db_expr_t addr;
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int have_addr;
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db_expr_t count;
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char * modif;
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{
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db_delete_watchpoint(db_map_addr(addr), addr);
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}
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/* Set watchpoint */
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/*ARGSUSED*/
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void
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db_watchpoint_cmd(addr, have_addr, count, modif)
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db_expr_t addr;
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int have_addr;
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db_expr_t count;
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char * modif;
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{
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vm_size_t size;
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db_expr_t value;
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if (db_expression(&value))
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size = (vm_size_t) value;
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else
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size = 4;
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db_skip_to_eol();
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db_set_watchpoint(db_map_addr(addr), addr, size);
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}
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/* list watchpoints */
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void
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db_listwatch_cmd()
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{
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db_list_watchpoints();
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}
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void
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db_set_watchpoints()
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{
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register db_watchpoint_t watch;
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if (!db_watchpoints_inserted) {
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for (watch = db_watchpoint_list;
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watch != 0;
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watch = watch->link)
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pmap_protect(watch->map->pmap,
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trunc_page(watch->loaddr),
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round_page(watch->hiaddr),
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VM_PROT_READ);
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db_watchpoints_inserted = TRUE;
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}
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}
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void
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db_clear_watchpoints()
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{
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db_watchpoints_inserted = FALSE;
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}
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boolean_t
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db_find_watchpoint(map, addr, regs)
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vm_map_t map;
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db_addr_t addr;
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db_regs_t *regs;
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{
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register db_watchpoint_t watch;
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db_watchpoint_t found = 0;
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for (watch = db_watchpoint_list;
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watch != 0;
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watch = watch->link)
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if (db_map_equal(watch->map, map)) {
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if ((watch->loaddr <= addr) &&
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(addr < watch->hiaddr))
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return (TRUE);
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else if ((trunc_page(watch->loaddr) <= addr) &&
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(addr < round_page(watch->hiaddr)))
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found = watch;
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}
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/*
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* We didn't hit exactly on a watchpoint, but we are
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* in a protected region. We want to single-step
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* and then re-protect.
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*/
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if (found) {
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db_watchpoints_inserted = FALSE;
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db_single_step(regs);
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}
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return (FALSE);
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}
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