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
48void
49db_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