313 lines
6.7 KiB
C
313 lines
6.7 KiB
C
/*-
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* SPDX-License-Identifier: MIT-CMU
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*
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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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* Author: Richard P. Draves, Carnegie Mellon University
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* Date: 10/90
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/proc.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <ddb/ddb.h>
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#include <ddb/db_watch.h>
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/*
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* Watchpoints.
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*/
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static bool db_watchpoints_inserted = true;
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#define NWATCHPOINTS 100
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static struct db_watchpoint db_watch_table[NWATCHPOINTS];
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static db_watchpoint_t db_next_free_watchpoint = &db_watch_table[0];
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static db_watchpoint_t db_free_watchpoints = 0;
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static db_watchpoint_t db_watchpoint_list = 0;
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static db_watchpoint_t db_watchpoint_alloc(void);
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static void db_watchpoint_free(db_watchpoint_t watch);
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static void db_delete_watchpoint(vm_map_t map, db_addr_t addr);
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#ifdef notused
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static bool db_find_watchpoint(vm_map_t map, db_addr_t addr,
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db_regs_t *regs);
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#endif
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static void db_list_watchpoints(void);
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static void db_set_watchpoint(vm_map_t map, db_addr_t addr,
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vm_size_t size);
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static db_watchpoint_t
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db_watchpoint_alloc(void)
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{
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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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static void
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db_watchpoint_free(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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static void
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db_set_watchpoint(vm_map_t map, db_addr_t addr, vm_size_t size)
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{
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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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static void
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db_delete_watchpoint(vm_map_t map, db_addr_t addr)
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{
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db_watchpoint_t watch;
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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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static void
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db_list_watchpoints(void)
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{
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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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#ifdef __LP64__
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db_printf(" Map Address Size\n");
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#else
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db_printf(" Map Address Size\n");
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#endif
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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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#ifdef __LP64__
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db_printf("%s%16p %16lx %lx\n",
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#else
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db_printf("%s%8p %8lx %lx\n",
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#endif
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db_map_current(watch->map) ? "*" : " ",
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(void *)watch->map, (long)watch->loaddr,
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(long)watch->hiaddr - (long)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(db_expr_t addr, bool have_addr, 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(db_expr_t addr, bool have_addr, 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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/*
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* At least one non-optional show-command must be implemented using
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* DB_SHOW_COMMAND() so that db_show_cmd_set gets created. Here is one.
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*/
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DB_SHOW_COMMAND(watches, db_listwatch_cmd)
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{
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db_list_watchpoints();
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db_md_list_watchpoints();
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}
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void
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db_set_watchpoints(void)
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{
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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(void)
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{
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db_watchpoints_inserted = false;
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}
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#ifdef notused
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static bool
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db_find_watchpoint(vm_map_t map, db_addr_t addr, db_regs_t regs)
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{
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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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#endif
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/* Delete hardware watchpoint */
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/*ARGSUSED*/
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void
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db_deletehwatch_cmd(db_expr_t addr, bool have_addr, db_expr_t count,
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char *modif)
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{
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int rc;
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if (count < 0)
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count = 4;
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rc = db_md_clr_watchpoint(addr, count);
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if (rc < 0)
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db_printf("hardware watchpoint could not be deleted\n");
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}
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/* Set hardware watchpoint */
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/*ARGSUSED*/
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void
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db_hwatchpoint_cmd(db_expr_t addr, bool have_addr, db_expr_t count,
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char *modif)
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{
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int rc;
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if (count < 0)
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count = 4;
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rc = db_md_set_watchpoint(addr, count);
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if (rc < 0)
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db_printf("hardware watchpoint could not be set\n");
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}
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