db_access.c revision 1.18.42.2
1 1.18.42.2 yamt /* $NetBSD: db_access.c,v 1.18.42.2 2010/03/11 15:03:20 yamt Exp $ */ 2 1.5 cgd 3 1.17 simonb /* 4 1.1 cgd * Mach Operating System 5 1.1 cgd * Copyright (c) 1991,1990 Carnegie Mellon University 6 1.1 cgd * All Rights Reserved. 7 1.17 simonb * 8 1.1 cgd * Permission to use, copy, modify and distribute this software and its 9 1.1 cgd * documentation is hereby granted, provided that both the copyright 10 1.1 cgd * notice and this permission notice appear in all copies of the 11 1.1 cgd * software, derivative works or modified versions, and any portions 12 1.1 cgd * thereof, and that both notices appear in supporting documentation. 13 1.17 simonb * 14 1.13 pk * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 15 1.1 cgd * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 16 1.1 cgd * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 1.17 simonb * 18 1.1 cgd * Carnegie Mellon requests users of this software to return to 19 1.17 simonb * 20 1.1 cgd * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 21 1.1 cgd * School of Computer Science 22 1.1 cgd * Carnegie Mellon University 23 1.1 cgd * Pittsburgh PA 15213-3890 24 1.17 simonb * 25 1.1 cgd * any improvements or extensions that they make and grant Carnegie the 26 1.1 cgd * rights to redistribute these changes. 27 1.2 cgd * 28 1.1 cgd * Author: David B. Golub, Carnegie Mellon University 29 1.1 cgd * Date: 7/90 30 1.1 cgd */ 31 1.16 lukem 32 1.16 lukem #include <sys/cdefs.h> 33 1.18.42.2 yamt __KERNEL_RCSID(0, "$NetBSD: db_access.c,v 1.18.42.2 2010/03/11 15:03:20 yamt Exp $"); 34 1.18.42.2 yamt 35 1.18.42.2 yamt #if defined(_KERNEL_OPT) 36 1.18.42.2 yamt #include "opt_kgdb.h" 37 1.18.42.2 yamt #endif 38 1.3 mycroft 39 1.3 mycroft #include <sys/param.h> 40 1.3 mycroft #include <sys/proc.h> 41 1.18.42.1 yamt #include <sys/endian.h> 42 1.3 mycroft 43 1.18.42.1 yamt #include <ddb/ddb.h> 44 1.7 mycroft 45 1.1 cgd /* 46 1.1 cgd * Access unaligned data items on aligned (longword) 47 1.1 cgd * boundaries. 48 1.18.42.2 yamt * 49 1.18.42.2 yamt * This file is shared by ddb, kgdb and crash(8). 50 1.1 cgd */ 51 1.1 cgd 52 1.18.42.2 yamt #if defined(DDB) || !defined(DDB) && !defined(KGDB) 53 1.18.42.2 yamt #define _COMPILE_THIS 54 1.18.42.2 yamt #endif 55 1.18.42.2 yamt 56 1.18.42.2 yamt #if defined(_COMPILE_THIS) || defined(KGDB) && defined(SOFTWARE_SSTEP) 57 1.18.42.2 yamt 58 1.15 jdolecek const int db_extend[] = { /* table for sign-extending */ 59 1.1 cgd 0, 60 1.1 cgd 0xFFFFFF80, 61 1.1 cgd 0xFFFF8000, 62 1.1 cgd 0xFF800000 63 1.1 cgd }; 64 1.1 cgd 65 1.1 cgd db_expr_t 66 1.18 thorpej db_get_value(db_addr_t addr, size_t size, bool is_signed) 67 1.1 cgd { 68 1.9 thorpej char data[sizeof(db_expr_t)]; 69 1.14 augustss db_expr_t value; 70 1.14 augustss size_t i; 71 1.1 cgd 72 1.1 cgd db_read_bytes(addr, size, data); 73 1.1 cgd 74 1.1 cgd value = 0; 75 1.8 mycroft #if BYTE_ORDER == LITTLE_ENDIAN 76 1.11 pk for (i = size; i-- > 0;) 77 1.8 mycroft #else /* BYTE_ORDER == BIG_ENDIAN */ 78 1.1 cgd for (i = 0; i < size; i++) 79 1.8 mycroft #endif /* BYTE_ORDER */ 80 1.8 mycroft value = (value << 8) + (data[i] & 0xFF); 81 1.17 simonb 82 1.8 mycroft if (size < 4 && is_signed && (value & db_extend[size]) != 0) 83 1.1 cgd value |= db_extend[size]; 84 1.1 cgd return (value); 85 1.1 cgd } 86 1.1 cgd 87 1.1 cgd void 88 1.17 simonb db_put_value(db_addr_t addr, size_t size, db_expr_t value) 89 1.1 cgd { 90 1.9 thorpej char data[sizeof(db_expr_t)]; 91 1.14 augustss size_t i; 92 1.1 cgd 93 1.8 mycroft #if BYTE_ORDER == LITTLE_ENDIAN 94 1.8 mycroft for (i = 0; i < size; i++) 95 1.8 mycroft #else /* BYTE_ORDER == BIG_ENDIAN */ 96 1.11 pk for (i = size; i-- > 0;) 97 1.8 mycroft #endif /* BYTE_ORDER */ 98 1.1 cgd { 99 1.8 mycroft data[i] = value & 0xFF; 100 1.8 mycroft value >>= 8; 101 1.1 cgd } 102 1.1 cgd 103 1.1 cgd db_write_bytes(addr, size, data); 104 1.1 cgd } 105 1.18.42.1 yamt 106 1.18.42.2 yamt #endif /* _COMPILE_THIS || KGDB && SOFTWARE_SSTEP */ 107 1.18.42.2 yamt 108 1.18.42.2 yamt #ifdef _COMPILE_THIS 109 1.18.42.2 yamt 110 1.18.42.1 yamt void * 111 1.18.42.1 yamt db_read_ptr(const char *name) 112 1.18.42.1 yamt { 113 1.18.42.1 yamt db_expr_t val; 114 1.18.42.1 yamt void *p; 115 1.18.42.1 yamt 116 1.18.42.1 yamt if (!db_value_of_name(name, &val)) { 117 1.18.42.1 yamt db_printf("db_read_ptr: cannot find `%s'\n", name); 118 1.18.42.1 yamt db_error(NULL); 119 1.18.42.1 yamt /* NOTREACHED */ 120 1.18.42.1 yamt } 121 1.18.42.1 yamt db_read_bytes((db_addr_t)val, sizeof(p), (char *)&p); 122 1.18.42.1 yamt return p; 123 1.18.42.1 yamt } 124 1.18.42.1 yamt 125 1.18.42.1 yamt int 126 1.18.42.1 yamt db_read_int(const char *name) 127 1.18.42.1 yamt { 128 1.18.42.1 yamt db_expr_t val; 129 1.18.42.1 yamt int p; 130 1.18.42.1 yamt 131 1.18.42.1 yamt if (!db_value_of_name(name, &val)) { 132 1.18.42.1 yamt db_printf("db_read_int: cannot find `%s'\n", name); 133 1.18.42.1 yamt db_error(NULL); 134 1.18.42.1 yamt /* NOTREACHED */ 135 1.18.42.1 yamt } 136 1.18.42.1 yamt db_read_bytes((db_addr_t)val, sizeof(p), (char *)&p); 137 1.18.42.1 yamt return p; 138 1.18.42.1 yamt } 139 1.18.42.2 yamt 140 1.18.42.2 yamt #endif /* _COMPILE_THIS */ 141
Indexes created Thu Oct 02 14:10:14 GMT 2025