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Annotation of Net2/ddb/db_break.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Mach Operating System
        !             3:  * Copyright (c) 1991,1990 Carnegie Mellon University
        !             4:  * All Rights Reserved.
        !             5:  * 
        !             6:  * Permission to use, copy, modify and distribute this software and its
        !             7:  * documentation is hereby granted, provided that both the copyright
        !             8:  * notice and this permission notice appear in all copies of the
        !             9:  * software, derivative works or modified versions, and any portions
        !            10:  * thereof, and that both notices appear in supporting documentation.
        !            11:  * 
        !            12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS 
        !            13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            15:  * 
        !            16:  * Carnegie Mellon requests users of this software to return to
        !            17:  * 
        !            18:  *  Software Distribution Coordinator  or  [email protected]
        !            19:  *  School of Computer Science
        !            20:  *  Carnegie Mellon University
        !            21:  *  Pittsburgh PA 15213-3890
        !            22:  * 
        !            23:  * any improvements or extensions that they make and grant Carnegie the
        !            24:  * rights to redistribute these changes.
        !            25:  */
        !            26: /*
        !            27:  * HISTORY
        !            28:  * $Log: db_break.c,v $
        !            29:  * Revision 1.1  1992/03/25  21:44:57  pace
        !            30:  * Initial revision
        !            31:  *
        !            32:  * Revision 2.7  91/02/05  17:06:00  mrt
        !            33:  *     Changed to new Mach copyright
        !            34:  *     [91/01/31  16:17:01  mrt]
        !            35:  * 
        !            36:  * Revision 2.6  91/01/08  15:09:03  rpd
        !            37:  *     Added db_map_equal, db_map_current, db_map_addr.
        !            38:  *     [90/11/10            rpd]
        !            39:  * 
        !            40:  * Revision 2.5  90/11/05  14:26:32  rpd
        !            41:  *     Initialize db_breakpoints_inserted to TRUE.
        !            42:  *     [90/11/04            rpd]
        !            43:  * 
        !            44:  * Revision 2.4  90/10/25  14:43:33  rwd
        !            45:  *     Added map field to breakpoints.
        !            46:  *     Added map argument to db_set_breakpoint, db_delete_breakpoint,
        !            47:  *     db_find_breakpoint.  Added db_find_breakpoint_here.
        !            48:  *     [90/10/18            rpd]
        !            49:  * 
        !            50:  * Revision 2.3  90/09/28  16:57:07  jsb
        !            51:  *     Fixed db_breakpoint_free.
        !            52:  *     [90/09/18            rpd]
        !            53:  * 
        !            54:  * Revision 2.2  90/08/27  21:49:53  dbg
        !            55:  *     Reflected changes in db_printsym()'s calling seq.
        !            56:  *     [90/08/20            af]
        !            57:  *     Clear breakpoints only if inserted.
        !            58:  *     Reduce lint.
        !            59:  *     [90/08/07            dbg]
        !            60:  *     Created.
        !            61:  *     [90/07/25            dbg]
        !            62:  * 
        !            63:  */
        !            64: /*
        !            65:  *     Author: David B. Golub, Carnegie Mellon University
        !            66:  *     Date:   7/90
        !            67:  */
        !            68: /*
        !            69:  * Breakpoints.
        !            70:  */
        !            71: #include "param.h"
        !            72: #include "proc.h"
        !            73: #include <machine/db_machdep.h>                /* type definitions */
        !            74: 
        !            75: #include <ddb/db_lex.h>
        !            76: #include <ddb/db_break.h>
        !            77: #include <ddb/db_access.h>
        !            78: #include <ddb/db_sym.h>
        !            79: #include <ddb/db_break.h>
        !            80: 
        !            81: extern boolean_t db_map_equal();
        !            82: extern boolean_t db_map_current();
        !            83: extern vm_map_t db_map_addr();
        !            84: 
        !            85: #define        NBREAKPOINTS    100
        !            86: struct db_breakpoint   db_break_table[NBREAKPOINTS];
        !            87: db_breakpoint_t                db_next_free_breakpoint = &db_break_table[0];
        !            88: db_breakpoint_t                db_free_breakpoints = 0;
        !            89: db_breakpoint_t                db_breakpoint_list = 0;
        !            90: 
        !            91: db_breakpoint_t
        !            92: db_breakpoint_alloc()
        !            93: {
        !            94:        register db_breakpoint_t        bkpt;
        !            95: 
        !            96:        if ((bkpt = db_free_breakpoints) != 0) {
        !            97:            db_free_breakpoints = bkpt->link;
        !            98:            return (bkpt);
        !            99:        }
        !           100:        if (db_next_free_breakpoint == &db_break_table[NBREAKPOINTS]) {
        !           101:            db_printf("All breakpoints used.\n");
        !           102:            return (0);
        !           103:        }
        !           104:        bkpt = db_next_free_breakpoint;
        !           105:        db_next_free_breakpoint++;
        !           106: 
        !           107:        return (bkpt);
        !           108: }
        !           109: 
        !           110: void
        !           111: db_breakpoint_free(bkpt)
        !           112:        register db_breakpoint_t        bkpt;
        !           113: {
        !           114:        bkpt->link = db_free_breakpoints;
        !           115:        db_free_breakpoints = bkpt;
        !           116: }
        !           117: 
        !           118: void
        !           119: db_set_breakpoint(map, addr, count)
        !           120:        vm_map_t        map;
        !           121:        db_addr_t       addr;
        !           122:        int             count;
        !           123: {
        !           124:        register db_breakpoint_t        bkpt;
        !           125: 
        !           126:        if (db_find_breakpoint(map, addr)) {
        !           127:            db_printf("Already set.\n");
        !           128:            return;
        !           129:        }
        !           130: 
        !           131:        bkpt = db_breakpoint_alloc();
        !           132:        if (bkpt == 0) {
        !           133:            db_printf("Too many breakpoints.\n");
        !           134:            return;
        !           135:        }
        !           136: 
        !           137:        bkpt->map = map;
        !           138:        bkpt->address = addr;
        !           139:        bkpt->flags = 0;
        !           140:        bkpt->init_count = count;
        !           141:        bkpt->count = count;
        !           142: 
        !           143:        bkpt->link = db_breakpoint_list;
        !           144:        db_breakpoint_list = bkpt;
        !           145: }
        !           146: 
        !           147: void
        !           148: db_delete_breakpoint(map, addr)
        !           149:        vm_map_t        map;
        !           150:        db_addr_t       addr;
        !           151: {
        !           152:        register db_breakpoint_t        bkpt;
        !           153:        register db_breakpoint_t        *prev;
        !           154: 
        !           155:        for (prev = &db_breakpoint_list;
        !           156:             (bkpt = *prev) != 0;
        !           157:             prev = &bkpt->link) {
        !           158:            if (db_map_equal(bkpt->map, map) &&
        !           159:                (bkpt->address == addr)) {
        !           160:                *prev = bkpt->link;
        !           161:                break;
        !           162:            }
        !           163:        }
        !           164:        if (bkpt == 0) {
        !           165:            db_printf("Not set.\n");
        !           166:            return;
        !           167:        }
        !           168: 
        !           169:        db_breakpoint_free(bkpt);
        !           170: }
        !           171: 
        !           172: db_breakpoint_t
        !           173: db_find_breakpoint(map, addr)
        !           174:        vm_map_t        map;
        !           175:        db_addr_t       addr;
        !           176: {
        !           177:        register db_breakpoint_t        bkpt;
        !           178: 
        !           179:        for (bkpt = db_breakpoint_list;
        !           180:             bkpt != 0;
        !           181:             bkpt = bkpt->link)
        !           182:        {
        !           183:            if (db_map_equal(bkpt->map, map) &&
        !           184:                (bkpt->address == addr))
        !           185:                return (bkpt);
        !           186:        }
        !           187:        return (0);
        !           188: }
        !           189: 
        !           190: db_breakpoint_t
        !           191: db_find_breakpoint_here(addr)
        !           192:        db_addr_t       addr;
        !           193: {
        !           194:     return db_find_breakpoint(db_map_addr(addr), addr);
        !           195: }
        !           196: 
        !           197: boolean_t      db_breakpoints_inserted = TRUE;
        !           198: 
        !           199: void
        !           200: db_set_breakpoints()
        !           201: {
        !           202:        register db_breakpoint_t        bkpt;
        !           203: 
        !           204:        if (!db_breakpoints_inserted) {
        !           205: 
        !           206:            for (bkpt = db_breakpoint_list;
        !           207:                 bkpt != 0;
        !           208:                 bkpt = bkpt->link)
        !           209:                if (db_map_current(bkpt->map)) {
        !           210:                    bkpt->bkpt_inst = db_get_value(bkpt->address,
        !           211:                                                   BKPT_SIZE,
        !           212:                                                   FALSE);
        !           213:                    db_put_value(bkpt->address,
        !           214:                                 BKPT_SIZE,
        !           215:                                 BKPT_SET(bkpt->bkpt_inst));
        !           216:                }
        !           217:            db_breakpoints_inserted = TRUE;
        !           218:        }
        !           219: }
        !           220: 
        !           221: void
        !           222: db_clear_breakpoints()
        !           223: {
        !           224:        register db_breakpoint_t        bkpt;
        !           225: 
        !           226:        if (db_breakpoints_inserted) {
        !           227: 
        !           228:            for (bkpt = db_breakpoint_list;
        !           229:                 bkpt != 0;
        !           230:                 bkpt = bkpt->link)
        !           231:                if (db_map_current(bkpt->map)) {
        !           232:                    db_put_value(bkpt->address, BKPT_SIZE, bkpt->bkpt_inst);
        !           233:                }
        !           234:            db_breakpoints_inserted = FALSE;
        !           235:        }
        !           236: }
        !           237: 
        !           238: /*
        !           239:  * Set a temporary breakpoint.
        !           240:  * The instruction is changed immediately,
        !           241:  * so the breakpoint does not have to be on the breakpoint list.
        !           242:  */
        !           243: db_breakpoint_t
        !           244: db_set_temp_breakpoint(addr)
        !           245:        db_addr_t       addr;
        !           246: {
        !           247:        register db_breakpoint_t        bkpt;
        !           248: 
        !           249:        bkpt = db_breakpoint_alloc();
        !           250:        if (bkpt == 0) {
        !           251:            db_printf("Too many breakpoints.\n");
        !           252:            return 0;
        !           253:        }
        !           254: 
        !           255:        bkpt->map = NULL;
        !           256:        bkpt->address = addr;
        !           257:        bkpt->flags = BKPT_TEMP;
        !           258:        bkpt->init_count = 1;
        !           259:        bkpt->count = 1;
        !           260: 
        !           261:        bkpt->bkpt_inst = db_get_value(bkpt->address, BKPT_SIZE, FALSE);
        !           262:        db_put_value(bkpt->address, BKPT_SIZE, BKPT_SET(bkpt->bkpt_inst));
        !           263:        return bkpt;
        !           264: }
        !           265: 
        !           266: void
        !           267: db_delete_temp_breakpoint(bkpt)
        !           268:        db_breakpoint_t bkpt;
        !           269: {
        !           270:        db_put_value(bkpt->address, BKPT_SIZE, bkpt->bkpt_inst);
        !           271:        db_breakpoint_free(bkpt);
        !           272: }
        !           273: 
        !           274: /*
        !           275:  * List breakpoints.
        !           276:  */
        !           277: void
        !           278: db_list_breakpoints()
        !           279: {
        !           280:        register db_breakpoint_t        bkpt;
        !           281: 
        !           282:        if (db_breakpoint_list == 0) {
        !           283:            db_printf("No breakpoints set\n");
        !           284:            return;
        !           285:        }
        !           286: 
        !           287:        db_printf(" Map      Count    Address\n");
        !           288:        for (bkpt = db_breakpoint_list;
        !           289:             bkpt != 0;
        !           290:             bkpt = bkpt->link)
        !           291:        {
        !           292:            db_printf("%s%8x %5d    ",
        !           293:                      db_map_current(bkpt->map) ? "*" : " ",
        !           294:                      bkpt->map, bkpt->init_count);
        !           295:            db_printsym(bkpt->address, DB_STGY_PROC);
        !           296:            db_printf("\n");
        !           297:        }
        !           298: }
        !           299: 
        !           300: /* Delete breakpoint */
        !           301: /*ARGSUSED*/
        !           302: void
        !           303: db_delete_cmd(addr, have_addr, count, modif)
        !           304:        db_expr_t       addr;
        !           305:        int             have_addr;
        !           306:        db_expr_t       count;
        !           307:        char *          modif;
        !           308: {
        !           309:        db_delete_breakpoint(db_map_addr(addr), (db_addr_t)addr);
        !           310: }
        !           311: 
        !           312: /* Set breakpoint with skip count */
        !           313: /*ARGSUSED*/
        !           314: void
        !           315: db_breakpoint_cmd(addr, have_addr, count, modif)
        !           316:        db_expr_t       addr;
        !           317:        int             have_addr;
        !           318:        db_expr_t       count;
        !           319:        char *          modif;
        !           320: {
        !           321:        if (count == -1)
        !           322:            count = 1;
        !           323: 
        !           324:        db_set_breakpoint(db_map_addr(addr), (db_addr_t)addr, count);
        !           325: }
        !           326: 
        !           327: /* list breakpoints */
        !           328: void
        !           329: db_listbreak_cmd()
        !           330: {
        !           331:        db_list_breakpoints();
        !           332: }
        !           333: 
        !           334: #include <vm/vm_kern.h>
        !           335: 
        !           336: /*
        !           337:  *     We want ddb to be usable before most of the kernel has been
        !           338:  *     initialized.  In particular, current_thread() or kernel_map
        !           339:  *     (or both) may be null.
        !           340:  */
        !           341: 
        !           342: boolean_t
        !           343: db_map_equal(map1, map2)
        !           344:        vm_map_t        map1, map2;
        !           345: {
        !           346:        return ((map1 == map2) ||
        !           347:                ((map1 == NULL) && (map2 == kernel_map)) ||
        !           348:                ((map1 == kernel_map) && (map2 == NULL)));
        !           349: }
        !           350: 
        !           351: boolean_t
        !           352: db_map_current(map)
        !           353:        vm_map_t        map;
        !           354: {
        !           355: #if 0
        !           356:        thread_t        thread;
        !           357: 
        !           358:        return ((map == NULL) ||
        !           359:                (map == kernel_map) ||
        !           360:                (((thread = current_thread()) != NULL) &&
        !           361:                 (map == thread->task->map)));
        !           362: #else
        !           363:        return (1);
        !           364: #endif
        !           365: }
        !           366: 
        !           367: vm_map_t
        !           368: db_map_addr(addr)
        !           369:        vm_offset_t addr;
        !           370: {
        !           371: #if 0
        !           372:        thread_t        thread;
        !           373: 
        !           374:        /*
        !           375:         *      We want to return kernel_map for all
        !           376:         *      non-user addresses, even when debugging
        !           377:         *      kernel tasks with their own maps.
        !           378:         */
        !           379: 
        !           380:        if ((VM_MIN_ADDRESS <= addr) &&
        !           381:            (addr < VM_MAX_ADDRESS) &&
        !           382:            ((thread = current_thread()) != NULL))
        !           383:            return thread->task->map;
        !           384:        else
        !           385: #endif
        !           386:            return kernel_map;
        !           387: }

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