1 /*-
2 * SPDX-License-Identifier: MIT-CMU
3 *
4 * Mach Operating System
5 * Copyright (c) 1991,1990 Carnegie Mellon University
6 * All Rights Reserved.
7 *
8 * Permission to use, copy, modify and distribute this software and its
9 * documentation is hereby granted, provided that both the copyright
10 * notice and this permission notice appear in all copies of the
11 * software, derivative works or modified versions, and any portions
12 * thereof, and that both notices appear in supporting documentation.
13 *
14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
17 *
18 * Carnegie Mellon requests users of this software to return to
19 *
20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
21 * School of Computer Science
22 * Carnegie Mellon University
23 * Pittsburgh PA 15213-3890
24 *
25 * any improvements or extensions that they make and grant Carnegie the
26 * rights to redistribute these changes.
27 *
28 */
29 /*
30 * Author: David B. Golub, Carnegie Mellon University
31 * Date: 7/90
32 */
33
34 /*
35 * Miscellaneous printing.
36 */
37
38 #include <sys/param.h>
39 #include <sys/kdb.h>
40 #include <sys/proc.h>
41
42 #include <machine/pcb.h>
43
44 #include <ddb/ddb.h>
45 #include <ddb/db_variables.h>
46 #include <ddb/db_sym.h>
47
48 void
db_show_regs(db_expr_t _1,bool _2,db_expr_t _3,char * modif)49 db_show_regs(db_expr_t _1, bool _2, db_expr_t _3, char *modif)
50 {
51 struct trapframe *oldtf;
52 struct db_variable *regp;
53 db_expr_t value, offset;
54 const char *name;
55
56 /*
57 * The 'u' modifier instructs us to print the previous trapframe, most
58 * often containing state from userspace. This is done by temporarily
59 * switching out kdb_frame.
60 *
61 * NB: curthread is used instead of kdb_thread, so that behaviour is
62 * consistent with regular `show registers`, which always prints
63 * curthread's trapframe.
64 */
65 oldtf = kdb_frame;
66 if (modif[0] == 'u') {
67 if (curthread->td_frame == NULL ||
68 curthread->td_frame == oldtf) {
69 db_printf("previous trapframe unavailable");
70 return;
71 }
72 kdb_frame = curthread->td_frame;
73 }
74
75 for (regp = db_regs; regp < db_eregs; regp++) {
76 if (!db_read_variable(regp, &value))
77 continue;
78 db_printf("%-12s%#*lr", regp->name,
79 (int)(sizeof(unsigned long) * 2 + 2), (unsigned long)value);
80 db_find_xtrn_sym_and_offset((db_addr_t)value, &name, &offset);
81 if (name != NULL && offset <= (unsigned long)db_maxoff &&
82 offset != value) {
83 db_printf("\t%s", name);
84 if (offset != 0)
85 db_printf("+%+#lr", (long)offset);
86 }
87 db_printf("\n");
88 }
89 db_print_loc_and_inst(PC_REGS());
90
91 kdb_frame = oldtf;
92 }
93