d6c0538dae
It was needed for mips only, and only kinda sorta worked for mips. It can be brought back if we grow another architecture that need it. Sponsored by: Netflix
307 lines
6.6 KiB
C
307 lines
6.6 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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/*
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* Author: David B. Golub, Carnegie Mellon University
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* Date: 7/90
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*/
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/*
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* Breakpoints.
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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 <vm/vm.h>
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#include <vm/vm_kern.h>
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#include <ddb/ddb.h>
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#include <ddb/db_break.h>
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#include <ddb/db_access.h>
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#include <ddb/db_sym.h>
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#define NBREAKPOINTS 100
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static struct db_breakpoint db_break_table[NBREAKPOINTS];
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static db_breakpoint_t db_next_free_breakpoint = &db_break_table[0];
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static db_breakpoint_t db_free_breakpoints = 0;
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static db_breakpoint_t db_breakpoint_list = 0;
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static db_breakpoint_t db_breakpoint_alloc(void);
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static void db_breakpoint_free(db_breakpoint_t bkpt);
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static void db_delete_breakpoint(vm_map_t map, db_addr_t addr);
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static db_breakpoint_t db_find_breakpoint(vm_map_t map, db_addr_t addr);
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static void db_list_breakpoints(void);
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static void db_set_breakpoint(vm_map_t map, db_addr_t addr, int count);
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static db_breakpoint_t
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db_breakpoint_alloc(void)
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{
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register db_breakpoint_t bkpt;
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if ((bkpt = db_free_breakpoints) != 0) {
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db_free_breakpoints = bkpt->link;
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return (bkpt);
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}
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if (db_next_free_breakpoint == &db_break_table[NBREAKPOINTS]) {
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db_printf("All breakpoints used.\n");
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return (0);
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}
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bkpt = db_next_free_breakpoint;
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db_next_free_breakpoint++;
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return (bkpt);
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}
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static void
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db_breakpoint_free(db_breakpoint_t bkpt)
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{
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bkpt->link = db_free_breakpoints;
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db_free_breakpoints = bkpt;
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}
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static void
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db_set_breakpoint(vm_map_t map, db_addr_t addr, int count)
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{
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register db_breakpoint_t bkpt;
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if (db_find_breakpoint(map, addr)) {
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db_printf("Already set.\n");
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return;
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}
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bkpt = db_breakpoint_alloc();
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if (bkpt == 0) {
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db_printf("Too many breakpoints.\n");
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return;
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}
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bkpt->map = map;
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bkpt->address = addr;
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bkpt->flags = 0;
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bkpt->init_count = count;
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bkpt->count = count;
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bkpt->link = db_breakpoint_list;
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db_breakpoint_list = bkpt;
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}
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static void
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db_delete_breakpoint(vm_map_t map, db_addr_t addr)
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{
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register db_breakpoint_t bkpt;
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register db_breakpoint_t *prev;
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for (prev = &db_breakpoint_list;
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(bkpt = *prev) != 0;
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prev = &bkpt->link) {
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if (db_map_equal(bkpt->map, map) &&
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(bkpt->address == addr)) {
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*prev = bkpt->link;
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break;
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}
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}
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if (bkpt == 0) {
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db_printf("Not set.\n");
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return;
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}
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db_breakpoint_free(bkpt);
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}
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static db_breakpoint_t
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db_find_breakpoint(vm_map_t map, db_addr_t addr)
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{
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register db_breakpoint_t bkpt;
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for (bkpt = db_breakpoint_list;
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bkpt != 0;
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bkpt = bkpt->link)
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{
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if (db_map_equal(bkpt->map, map) &&
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(bkpt->address == addr))
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return (bkpt);
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}
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return (0);
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}
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db_breakpoint_t
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db_find_breakpoint_here(db_addr_t addr)
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{
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return db_find_breakpoint(db_map_addr(addr), addr);
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}
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static bool db_breakpoints_inserted = true;
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#ifndef BKPT_WRITE
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#define BKPT_WRITE(addr, storage) \
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do { \
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*storage = db_get_value(addr, BKPT_SIZE, false); \
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db_put_value(addr, BKPT_SIZE, BKPT_SET(*storage)); \
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} while (0)
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#endif
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#ifndef BKPT_CLEAR
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#define BKPT_CLEAR(addr, storage) \
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db_put_value(addr, BKPT_SIZE, *storage)
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#endif
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void
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db_set_breakpoints(void)
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{
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register db_breakpoint_t bkpt;
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if (!db_breakpoints_inserted) {
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for (bkpt = db_breakpoint_list;
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bkpt != 0;
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bkpt = bkpt->link)
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if (db_map_current(bkpt->map)) {
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BKPT_WRITE(bkpt->address, &bkpt->bkpt_inst);
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}
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db_breakpoints_inserted = true;
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}
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}
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void
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db_clear_breakpoints(void)
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{
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register db_breakpoint_t bkpt;
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if (db_breakpoints_inserted) {
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for (bkpt = db_breakpoint_list;
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bkpt != 0;
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bkpt = bkpt->link)
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if (db_map_current(bkpt->map)) {
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BKPT_CLEAR(bkpt->address, &bkpt->bkpt_inst);
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}
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db_breakpoints_inserted = false;
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}
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}
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/*
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* List breakpoints.
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*/
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static void
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db_list_breakpoints(void)
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{
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register db_breakpoint_t bkpt;
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if (db_breakpoint_list == 0) {
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db_printf("No breakpoints set\n");
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return;
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}
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db_printf(" Map Count Address\n");
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for (bkpt = db_breakpoint_list;
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bkpt != 0;
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bkpt = bkpt->link) {
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db_printf("%s%8p %5d ",
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db_map_current(bkpt->map) ? "*" : " ",
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(void *)bkpt->map, bkpt->init_count);
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db_printsym(bkpt->address, DB_STGY_PROC);
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db_printf("\n");
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}
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}
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/* Delete breakpoint */
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/*ARGSUSED*/
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void
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db_delete_cmd(db_expr_t addr, bool have_addr, db_expr_t count, char *modif)
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{
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db_delete_breakpoint(db_map_addr(addr), (db_addr_t)addr);
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}
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/* Set breakpoint with skip count */
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/*ARGSUSED*/
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void
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db_breakpoint_cmd(db_expr_t addr, bool have_addr, db_expr_t count, char *modif)
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{
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if (count == -1)
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count = 1;
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db_set_breakpoint(db_map_addr(addr), (db_addr_t)addr, count);
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}
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/* list breakpoints */
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void
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db_listbreak_cmd(db_expr_t dummy1, bool dummy2, db_expr_t dummy3, char *dummy4)
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{
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db_list_breakpoints();
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}
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/*
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* We want ddb to be usable before most of the kernel has been
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* initialized. In particular, current_thread() or kernel_map
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* (or both) may be null.
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*/
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bool
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db_map_equal(vm_map_t map1, vm_map_t map2)
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{
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return ((map1 == map2) ||
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((map1 == NULL) && (map2 == kernel_map)) ||
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((map1 == kernel_map) && (map2 == NULL)));
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}
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bool
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db_map_current(vm_map_t map)
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{
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#if 0
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thread_t thread;
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return ((map == NULL) ||
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(map == kernel_map) ||
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(((thread = current_thread()) != NULL) &&
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(map == thread->task->map)));
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#else
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return (true);
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#endif
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}
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vm_map_t
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db_map_addr(vm_offset_t addr)
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{
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#if 0
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thread_t thread;
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/*
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* We want to return kernel_map for all
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* non-user addresses, even when debugging
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* kernel tasks with their own maps.
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*/
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if ((VM_MIN_ADDRESS <= addr) &&
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(addr < VM_MAX_ADDRESS) &&
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((thread = current_thread()) != NULL))
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return thread->task->map;
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else
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#endif
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return kernel_map;
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}
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