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/*
* 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 "AS IS"
* 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 Mellon
* the rights to redistribute these changes.
*/
/*
* Author: David B. Golub, Carnegie Mellon University
* Date: 7/90
*/
#include "mach_kdb.h"
#if MACH_KDB
#include <mach/boolean.h>
#include <machine/db_machdep.h> /* type definitions */
#include <machine/setjmp.h>
#include <kern/task.h>
#include <ddb/db_access.h>
/*
* Access unaligned data items on aligned (longword)
* boundaries.
*/
extern void db_read_bytes(); /* machine-dependent */
extern void db_write_bytes(); /* machine-dependent */
int db_access_level = DB_ACCESS_LEVEL;
/*
* This table is for sign-extending things.
* Therefore its entries are signed, and yes
* they are infact negative numbers.
* So don't you put no more Us in it. Or Ls either.
* Otherwise there is no point having it, n'est pas ?
*/
static int db_extend[sizeof(int)+1] = { /* table for sign-extending */
0,
0xFFFFFF80,
0xFFFF8000,
0xFF800000,
0x80000000
};
db_expr_t
db_get_task_value(addr, size, is_signed, task)
db_addr_t addr;
register int size;
boolean_t is_signed;
task_t task;
{
char data[sizeof(db_expr_t)];
register db_expr_t value;
register int i;
db_read_bytes((void*)addr, size, data, task);
value = 0;
#if BYTE_MSF
for (i = 0; i < size; i++)
#else /* BYTE_LSF */
for (i = size - 1; i >= 0; i--)
#endif
{
value = (value << 8) + (data[i] & 0xFF);
}
if (size <= sizeof(int)) {
if (is_signed && (value & db_extend[size]) != 0)
value |= db_extend[size];
}
return (value);
}
void
db_put_task_value(addr, size, value, task)
db_addr_t addr;
register int size;
register db_expr_t value;
task_t task;
{
char data[sizeof(db_expr_t)];
register int i;
#if BYTE_MSF
for (i = size - 1; i >= 0; i--)
#else /* BYTE_LSF */
for (i = 0; i < size; i++)
#endif
{
data[i] = value & 0xFF;
value >>= 8;
}
db_write_bytes((void*)addr, size, data, task);
}
db_expr_t
db_get_value(addr, size, is_signed)
db_addr_t addr;
int size;
boolean_t is_signed;
{
return(db_get_task_value(addr, size, is_signed, TASK_NULL));
}
void
db_put_value(addr, size, value)
db_addr_t addr;
int size;
db_expr_t value;
{
db_put_task_value(addr, size, value, TASK_NULL);
}
#endif /* MACH_KDB */
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