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Annotation of Gnu-Mach/ddb/db_access.c, revision 1.1.1.2

1.1.1.2 ! root        1: /*
1.1       root        2:  * Mach Operating System
                      3:  * Copyright (c) 1991,1990 Carnegie Mellon University
                      4:  * All Rights Reserved.
1.1.1.2 ! root        5:  *
1.1       root        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.
1.1.1.2 ! root       11:  *
1.1       root       12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
1.1.1.2 ! root       15:  *
1.1       root       16:  * Carnegie Mellon requests users of this software to return to
1.1.1.2 ! root       17:  *
1.1       root       18:  *  Software Distribution Coordinator  or  [email protected]
                     19:  *  School of Computer Science
                     20:  *  Carnegie Mellon University
                     21:  *  Pittsburgh PA 15213-3890
1.1.1.2 ! root       22:  *
1.1       root       23:  * any improvements or extensions that they make and grant Carnegie Mellon
                     24:  * the rights to redistribute these changes.
                     25:  */
                     26: /*
                     27:  *     Author: David B. Golub, Carnegie Mellon University
                     28:  *     Date:   7/90
                     29:  */
                     30: #include "mach_kdb.h"
                     31: #if MACH_KDB
                     32: 
                     33: #include <mach/boolean.h>
                     34: #include <machine/db_machdep.h>                /* type definitions */
                     35: #include <machine/setjmp.h>
                     36: #include <kern/task.h>
                     37: #include <ddb/db_access.h>
                     38: 
                     39: 
                     40: 
                     41: /*
                     42:  * Access unaligned data items on aligned (longword)
                     43:  * boundaries.
                     44:  */
                     45: 
                     46: extern void    db_read_bytes();        /* machine-dependent */
                     47: extern void    db_write_bytes();       /* machine-dependent */
                     48: 
                     49: int db_access_level = DB_ACCESS_LEVEL;
                     50: 
                     51: /*
                     52:  * This table is for sign-extending things.
                     53:  * Therefore its entries are signed, and yes
                     54:  * they are infact negative numbers.
                     55:  * So don't you put no more Us in it. Or Ls either.
                     56:  * Otherwise there is no point having it, n'est pas ?
                     57:  */
                     58: static int db_extend[sizeof(int)+1] = {        /* table for sign-extending */
                     59:        0,
                     60:        0xFFFFFF80,
                     61:        0xFFFF8000,
                     62:        0xFF800000,
                     63:        0x80000000
                     64: };
                     65: 
                     66: db_expr_t
                     67: db_get_task_value(addr, size, is_signed, task)
                     68:        db_addr_t       addr;
                     69:        register int    size;
                     70:        boolean_t       is_signed;
                     71:        task_t          task;
                     72: {
                     73:        char            data[sizeof(db_expr_t)];
                     74:        register db_expr_t value;
                     75:        register int    i;
                     76: 
                     77:        db_read_bytes((void*)addr, size, data, task);
                     78: 
                     79:        value = 0;
                     80: #if    BYTE_MSF
                     81:        for (i = 0; i < size; i++)
                     82: #else  /* BYTE_LSF */
                     83:        for (i = size - 1; i >= 0; i--)
                     84: #endif
                     85:        {
                     86:            value = (value << 8) + (data[i] & 0xFF);
                     87:        }
1.1.1.2 ! root       88: 
1.1       root       89:        if (size <= sizeof(int)) {
                     90:            if (is_signed && (value & db_extend[size]) != 0)
                     91:                value |= db_extend[size];
                     92:        }
                     93:        return (value);
                     94: }
                     95: 
                     96: void
                     97: db_put_task_value(addr, size, value, task)
                     98:        db_addr_t       addr;
                     99:        register int    size;
                    100:        register db_expr_t value;
                    101:        task_t          task;
                    102: {
                    103:        char            data[sizeof(db_expr_t)];
                    104:        register int    i;
                    105: 
                    106: #if    BYTE_MSF
                    107:        for (i = size - 1; i >= 0; i--)
                    108: #else  /* BYTE_LSF */
                    109:        for (i = 0; i < size; i++)
                    110: #endif
                    111:        {
                    112:            data[i] = value & 0xFF;
                    113:            value >>= 8;
                    114:        }
                    115: 
                    116:        db_write_bytes((void*)addr, size, data, task);
                    117: }
                    118: 
                    119: db_expr_t
                    120: db_get_value(addr, size, is_signed)
                    121:        db_addr_t       addr;
                    122:        int             size;
                    123:        boolean_t       is_signed;
                    124: {
                    125:        return(db_get_task_value(addr, size, is_signed, TASK_NULL));
                    126: }
                    127: 
                    128: void
                    129: db_put_value(addr, size, value)
                    130:        db_addr_t       addr;
                    131:        int             size;
                    132:        db_expr_t       value;
                    133: {
                    134:        db_put_task_value(addr, size, value, TASK_NULL);
                    135: }
                    136: 
1.1.1.2 ! root      137: #endif /* MACH_KDB */

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