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 db_expr_t 53 db_get_value(addr, size, is_signed) 54 db_addr_t addr; 55 register int size; 56 boolean_t is_signed; 57 { 58 char data[sizeof(u_int64_t)]; 59 register db_expr_t value; 60 register int i; 61 62 if (db_read_bytes(addr, size, data) != 0) { 63 db_printf("*** error reading from address %llx ***\n", 64 (long long)addr); 65 kdb_reenter(); 66 } 67 68 value = 0; 69 #if BYTE_MSF 70 for (i = 0; i < size; i++) 71 #else /* BYTE_LSF */ 72 for (i = size - 1; i >= 0; i--) 73 #endif 74 { 75 value = (value << 8) + (data[i] & 0xFF); 76 } 77 78 if (size < 4) { 79 if (is_signed && (value & db_extend[size]) != 0) 80 value |= db_extend[size]; 81 } 82 return (value); 83 } 84 85 void 86 db_put_value(addr, size, value) 87 db_addr_t addr; 88 register int size; 89 register db_expr_t value; 90 { 91 char data[sizeof(int)]; 92 register int i; 93 94 #if BYTE_MSF 95 for (i = size - 1; i >= 0; i--) 96 #else /* BYTE_LSF */ 97 for (i = 0; i < size; i++) 98 #endif 99 { 100 data[i] = value & 0xFF; 101 value >>= 8; 102 } 103 104 if (db_write_bytes(addr, size, data) != 0) { 105 db_printf("*** error writing to address %llx ***\n", 106 (long long)addr); 107 kdb_reenter(); 108 } 109 } 110