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Annotation of XNU/osfmk/ddb/db_write_cmd.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * @OSF_COPYRIGHT@
        !            24:  */
        !            25: /*
        !            26:  * HISTORY
        !            27:  * 
        !            28:  * Revision 1.1.1.1  1998/09/22 21:05:48  wsanchez
        !            29:  * Import of Mac OS X kernel (~semeria)
        !            30:  *
        !            31:  * Revision 1.1.1.1  1998/03/07 02:26:09  wsanchez
        !            32:  * Import of OSF Mach kernel (~mburg)
        !            33:  *
        !            34:  * Revision 1.2.10.1  1994/09/23  01:23:15  ezf
        !            35:  *     change marker to not FREE
        !            36:  *     [1994/09/22  21:11:42  ezf]
        !            37:  *
        !            38:  * Revision 1.2.8.3  1994/03/17  22:35:48  dwm
        !            39:  *     The infamous name change:  thread_activation + thread_shuttle = thread.
        !            40:  *     [1994/03/17  21:26:02  dwm]
        !            41:  * 
        !            42:  * Revision 1.2.8.2  1994/01/12  17:51:11  dwm
        !            43:  *     Coloc: initial restructuring to follow Utah model.
        !            44:  *     [1994/01/12  17:13:42  dwm]
        !            45:  * 
        !            46:  * Revision 1.2.8.1  1994/01/05  19:28:25  bolinger
        !            47:  *     Target current address space, not current "task", for writes.
        !            48:  *     [1994/01/04  17:44:51  bolinger]
        !            49:  * 
        !            50:  * Revision 1.2.2.3  1993/07/27  18:28:36  elliston
        !            51:  *     Add ANSI prototypes.  CR #9523.
        !            52:  *     [1993/07/27  18:13:37  elliston]
        !            53:  * 
        !            54:  * Revision 1.2.2.2  1993/06/09  02:21:11  gm
        !            55:  *     Added to OSF/1 R1.3 from NMK15.0.
        !            56:  *     [1993/06/02  20:58:03  jeffc]
        !            57:  * 
        !            58:  * Revision 1.2  1993/04/19  16:03:43  devrcs
        !            59:  *     Changes from mk78:
        !            60:  *     Removed unused variable 'p' from db_write_cmd().
        !            61:  *     [92/05/16            jfriedl]
        !            62:  *     Reorganized. w/u now works, instead of just w/tu.
        !            63:  *     [92/04/18            danner]
        !            64:  *     [93/02/02            bruel]
        !            65:  * 
        !            66:  * Revision 1.1  1992/09/30  02:01:35  robert
        !            67:  *     Initial revision
        !            68:  * 
        !            69:  * $EndLog$
        !            70:  */
        !            71: /* CMU_HIST */
        !            72: /*
        !            73:  * Revision 2.6  91/10/09  16:05:06  af
        !            74:  *      Revision 2.5.3.1  91/10/05  13:09:25  jeffreyh
        !            75:  *             Added user space write support including inactive task.
        !            76:  *             [91/08/29            tak]
        !            77:  * 
        !            78:  * Revision 2.5.3.1  91/10/05  13:09:25  jeffreyh
        !            79:  *     Added user space write support including inactive task.
        !            80:  *     [91/08/29            tak]
        !            81:  * 
        !            82:  * Revision 2.5  91/05/14  15:38:04  mrt
        !            83:  *     Correcting copyright
        !            84:  * 
        !            85:  * Revision 2.4  91/02/05  17:07:35  mrt
        !            86:  *     Changed to new Mach copyright
        !            87:  *     [91/01/31  16:20:19  mrt]
        !            88:  * 
        !            89:  * Revision 2.3  90/10/25  14:44:26  rwd
        !            90:  *     Changed db_write_cmd to print unsigned.
        !            91:  *     [90/10/19            rpd]
        !            92:  * 
        !            93:  * Revision 2.2  90/08/27  21:53:54  dbg
        !            94:  *     Set db_prev and db_next instead of explicitly advancing dot.
        !            95:  *     [90/08/22            dbg]
        !            96:  *     Reflected changes in db_printsym()'s calling seq.
        !            97:  *     [90/08/20            af]
        !            98:  *     Warn user if nothing was written.
        !            99:  *     [90/08/07            dbg]
        !           100:  *     Created.
        !           101:  *     [90/07/25            dbg]
        !           102:  * 
        !           103:  */
        !           104: /* CMU_ENDHIST */
        !           105: /* 
        !           106:  * Mach Operating System
        !           107:  * Copyright (c) 1991,1990 Carnegie Mellon University
        !           108:  * All Rights Reserved.
        !           109:  * 
        !           110:  * Permission to use, copy, modify and distribute this software and its
        !           111:  * documentation is hereby granted, provided that both the copyright
        !           112:  * notice and this permission notice appear in all copies of the
        !           113:  * software, derivative works or modified versions, and any portions
        !           114:  * thereof, and that both notices appear in supporting documentation.
        !           115:  * 
        !           116:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !           117:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !           118:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !           119:  * 
        !           120:  * Carnegie Mellon requests users of this software to return to
        !           121:  * 
        !           122:  *  Software Distribution Coordinator  or  [email protected]
        !           123:  *  School of Computer Science
        !           124:  *  Carnegie Mellon University
        !           125:  *  Pittsburgh PA 15213-3890
        !           126:  * 
        !           127:  * any improvements or extensions that they make and grant Carnegie Mellon
        !           128:  * the rights to redistribute these changes.
        !           129:  */
        !           130: /*
        !           131:  */
        !           132: /*
        !           133:  *     Author: David B. Golub,  Carnegie Mellon University
        !           134:  *     Date:   7/90
        !           135:  */
        !           136: 
        !           137: #include <mach/boolean.h>
        !           138: #include <kern/task.h>
        !           139: #include <kern/thread.h>
        !           140: 
        !           141: #include <machine/db_machdep.h>
        !           142: 
        !           143: #include <ddb/db_lex.h>
        !           144: #include <ddb/db_access.h>
        !           145: #include <ddb/db_command.h>
        !           146: #include <ddb/db_sym.h>
        !           147: #include <ddb/db_task_thread.h>
        !           148: #include <ddb/db_expr.h>
        !           149: #include <ddb/db_write_cmd.h>
        !           150: #include <ddb/db_output.h>                     /* For db_printf() */
        !           151: 
        !           152: /*
        !           153:  * Write to file.
        !           154:  */
        !           155: void
        !           156: db_write_cmd(
        !           157:        db_expr_t       address,
        !           158:        boolean_t       have_addr,
        !           159:        db_expr_t       count,
        !           160:        char *          modif)
        !           161: {
        !           162:        register db_addr_t      addr;
        !           163:        register db_expr_t      old_value;
        !           164:        db_expr_t       new_value;
        !           165:        register int    size;
        !           166:        boolean_t       wrote_one = FALSE;
        !           167:        boolean_t       t_opt, u_opt;
        !           168:        thread_act_t    thr_act;
        !           169:        task_t          task;
        !           170: 
        !           171:        addr = (db_addr_t) address;
        !           172: 
        !           173:        size = db_size_option(modif, &u_opt, &t_opt);
        !           174: 
        !           175:        if (t_opt) 
        !           176:          {
        !           177:            if (!db_get_next_act(&thr_act, 0))
        !           178:              return;
        !           179:            task = thr_act->task;
        !           180:          }
        !           181:        else
        !           182:          task = db_current_space();
        !           183: 
        !           184:        /* if user space is not explicitly specified, 
        !           185:           look in the kernel */
        !           186:        if (!u_opt)
        !           187:          task = TASK_NULL;
        !           188: 
        !           189:        if (!DB_VALID_ADDRESS(addr, u_opt)) {
        !           190:          db_printf("Bad address 0x%x\n", addr);
        !           191:          return;
        !           192:        }
        !           193: 
        !           194:        while (db_expression(&new_value)) {
        !           195:            old_value = db_get_task_value(addr, size, FALSE, task);
        !           196:            db_task_printsym(addr, DB_STGY_ANY, task);
        !           197:            db_printf("\t\t%#8n\t=\t%#8n\n", old_value, new_value);
        !           198:            db_put_task_value(addr, size, new_value, task);
        !           199:            addr += size;
        !           200: 
        !           201:            wrote_one = TRUE;
        !           202:        }
        !           203: 
        !           204:        if (!wrote_one)
        !           205:            db_error("Nothing written.\n");
        !           206: 
        !           207:        db_next = addr;
        !           208:        db_prev = addr - size;
        !           209: }

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