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Diffstat (limited to 'ddb/db_access.c')
| -rw-r--r-- | ddb/db_access.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/ddb/db_access.c b/ddb/db_access.c new file mode 100644 index 0000000..7a39144 --- /dev/null +++ b/ddb/db_access.c @@ -0,0 +1,137 @@ +/* + * 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 |