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 Software.Distribution@CS.CMU.EDU 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 * Author: David B. Golub, Carnegie Mellon University 28 * Date: 7/90 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/kdb.h> 36 37 #include <ddb/ddb.h> 38 #include <ddb/db_access.h> 39 40 /* 41 * Access unaligned data items on aligned (longword) 42 * boundaries. 43 */ 44 45 static unsigned db_extend[] = { /* table for sign-extending */ 46 0, 47 0xFFFFFF80U, 48 0xFFFF8000U, 49 0xFF800000U 50 }; 51 52 #ifndef BYTE_MSF 53 #define BYTE_MSF 0 54 #endif 55 56 db_expr_t 57 db_get_value(addr, size, is_signed) 58 db_addr_t addr; 59 register int size; 60 boolean_t is_signed; 61 { 62 char data[sizeof(u_int64_t)]; 63 register db_expr_t value; 64 register int i; 65 66 if (db_read_bytes(addr, size, data) != 0) { 67 db_printf("*** error reading from address %llx ***\n", 68 (long long)addr); 69 kdb_reenter(); 70 } 71 72 value = 0; 73 #if BYTE_MSF 74 for (i = 0; i < size; i++) 75 #else /* BYTE_LSF */ 76 for (i = size - 1; i >= 0; i--) 77 #endif 78 { 79 value = (value << 8) + (data[i] & 0xFF); 80 } 81 82 if (size < 4) { 83 if (is_signed && (value & db_extend[size]) != 0) 84 value |= db_extend[size]; 85 } 86 return (value); 87 } 88 89 void 90 db_put_value(addr, size, value) 91 db_addr_t addr; 92 register int size; 93 register db_expr_t value; 94 { 95 char data[sizeof(int)]; 96 register int i; 97 98 #if BYTE_MSF 99 for (i = size - 1; i >= 0; i--) 100 #else /* BYTE_LSF */ 101 for (i = 0; i < size; i++) 102 #endif 103 { 104 data[i] = value & 0xFF; 105 value >>= 8; 106 } 107 108 if (db_write_bytes(addr, size, data) != 0) { 109 db_printf("*** error writing to address %llx ***\n", 110 (long long)addr); 111 kdb_reenter(); 112 } 113 } 114