/* * 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_watch.c,v $ * Revision 1.1 1992/03/25 21:45:37 pace * Initial revision * * Revision 2.5 91/02/05 17:07:27 mrt * Changed to new Mach copyright * [91/01/31 16:20:02 mrt] * * Revision 2.4 91/01/08 15:09:24 rpd * Use db_map_equal, db_map_current, db_map_addr. * [90/11/10 rpd] * * Revision 2.3 90/11/05 14:26:39 rpd * Initialize db_watchpoints_inserted to TRUE. * [90/11/04 rpd] * * Revision 2.2 90/10/25 14:44:16 rwd * Made db_watchpoint_cmd parse a size argument. * [90/10/17 rpd] * Generalized the watchpoint support. * [90/10/16 rwd] * Created. * [90/10/16 rpd] * */ /* * Author: Richard P. Draves, Carnegie Mellon University * Date: 10/90 */ #include "param.h" #include "proc.h" #include #include #include #include #include #include #include /* * Watchpoints. */ extern boolean_t db_map_equal(); extern boolean_t db_map_current(); extern vm_map_t db_map_addr(); boolean_t db_watchpoints_inserted = TRUE; #define NWATCHPOINTS 100 struct db_watchpoint db_watch_table[NWATCHPOINTS]; db_watchpoint_t db_next_free_watchpoint = &db_watch_table[0]; db_watchpoint_t db_free_watchpoints = 0; db_watchpoint_t db_watchpoint_list = 0; db_watchpoint_t db_watchpoint_alloc() { register db_watchpoint_t watch; if ((watch = db_free_watchpoints) != 0) { db_free_watchpoints = watch->link; return (watch); } if (db_next_free_watchpoint == &db_watch_table[NWATCHPOINTS]) { db_printf("All watchpoints used.\n"); return (0); } watch = db_next_free_watchpoint; db_next_free_watchpoint++; return (watch); } void db_watchpoint_free(watch) register db_watchpoint_t watch; { watch->link = db_free_watchpoints; db_free_watchpoints = watch; } void db_set_watchpoint(map, addr, size) vm_map_t map; db_addr_t addr; vm_size_t size; { register db_watchpoint_t watch; if (map == NULL) { db_printf("No map.\n"); return; } /* * Should we do anything fancy with overlapping regions? */ for (watch = db_watchpoint_list; watch != 0; watch = watch->link) if (db_map_equal(watch->map, map) && (watch->loaddr == addr) && (watch->hiaddr == addr+size)) { db_printf("Already set.\n"); return; } watch = db_watchpoint_alloc(); if (watch == 0) { db_printf("Too many watchpoints.\n"); return; } watch->map = map; watch->loaddr = addr; watch->hiaddr = addr+size; watch->link = db_watchpoint_list; db_watchpoint_list = watch; db_watchpoints_inserted = FALSE; } void db_delete_watchpoint(map, addr) vm_map_t map; db_addr_t addr; { register db_watchpoint_t watch; register db_watchpoint_t *prev; for (prev = &db_watchpoint_list; (watch = *prev) != 0; prev = &watch->link) if (db_map_equal(watch->map, map) && (watch->loaddr <= addr) && (addr < watch->hiaddr)) { *prev = watch->link; db_watchpoint_free(watch); return; } db_printf("Not set.\n"); } void db_list_watchpoints() { register db_watchpoint_t watch; if (db_watchpoint_list == 0) { db_printf("No watchpoints set\n"); return; } db_printf(" Map Address Size\n"); for (watch = db_watchpoint_list; watch != 0; watch = watch->link) db_printf("%s%8x %8x %x\n", db_map_current(watch->map) ? "*" : " ", watch->map, watch->loaddr, watch->hiaddr - watch->loaddr); } /* Delete watchpoint */ /*ARGSUSED*/ void db_deletewatch_cmd(addr, have_addr, count, modif) db_expr_t addr; int have_addr; db_expr_t count; char * modif; { db_delete_watchpoint(db_map_addr(addr), addr); } /* Set watchpoint */ /*ARGSUSED*/ void db_watchpoint_cmd(addr, have_addr, count, modif) db_expr_t addr; int have_addr; db_expr_t count; char * modif; { vm_size_t size; db_expr_t value; if (db_expression(&value)) size = (vm_size_t) value; else size = 4; db_skip_to_eol(); db_set_watchpoint(db_map_addr(addr), addr, size); } /* list watchpoints */ void db_listwatch_cmd() { db_list_watchpoints(); } void db_set_watchpoints() { register db_watchpoint_t watch; if (!db_watchpoints_inserted) { for (watch = db_watchpoint_list; watch != 0; watch = watch->link) pmap_protect(watch->map->pmap, trunc_page(watch->loaddr), round_page(watch->hiaddr), VM_PROT_READ); db_watchpoints_inserted = TRUE; } } void db_clear_watchpoints() { db_watchpoints_inserted = FALSE; } boolean_t db_find_watchpoint(map, addr, regs) vm_map_t map; db_addr_t addr; db_regs_t *regs; { register db_watchpoint_t watch; db_watchpoint_t found = 0; for (watch = db_watchpoint_list; watch != 0; watch = watch->link) if (db_map_equal(watch->map, map)) { if ((watch->loaddr <= addr) && (addr < watch->hiaddr)) return (TRUE); else if ((trunc_page(watch->loaddr) <= addr) && (addr < round_page(watch->hiaddr))) found = watch; } /* * We didn't hit exactly on a watchpoint, but we are * in a protected region. We want to single-step * and then re-protect. */ if (found) { db_watchpoints_inserted = FALSE; db_single_step(regs); } return (FALSE); }