2 * SPDX-License-Identifier: MIT-CMU
4 * Mach Operating System
5 * Copyright (c) 1991,1990 Carnegie Mellon University
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.
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.
18 * Carnegie Mellon requests users of this software to return to
20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
21 * School of Computer Science
22 * Carnegie Mellon University
23 * Pittsburgh PA 15213-3890
25 * any improvements or extensions that they make and grant Carnegie the
26 * rights to redistribute these changes.
30 * Author: David B. Golub, Carnegie Mellon University
35 * Miscellaneous printing.
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include <sys/param.h>
45 #include <machine/pcb.h>
48 #include <ddb/db_variables.h>
49 #include <ddb/db_sym.h>
52 db_show_regs(db_expr_t _1, bool _2, db_expr_t _3, char *modif)
54 struct trapframe *oldtf;
55 struct db_variable *regp;
56 db_expr_t value, offset;
60 * The 'u' modifier instructs us to print the previous trapframe, most
61 * often containing state from userspace. This is done by temporarily
62 * switching out kdb_frame.
64 * NB: curthread is used instead of kdb_thread, so that behaviour is
65 * consistent with regular `show registers`, which always prints
66 * curthread's trapframe.
69 if (modif[0] == 'u') {
70 if (curthread->td_frame == NULL ||
71 curthread->td_frame == oldtf) {
72 db_printf("previous trapframe unavailable");
75 kdb_frame = curthread->td_frame;
78 for (regp = db_regs; regp < db_eregs; regp++) {
79 if (!db_read_variable(regp, &value))
81 db_printf("%-12s%#*lr", regp->name,
82 (int)(sizeof(unsigned long) * 2 + 2), (unsigned long)value);
83 db_find_xtrn_sym_and_offset((db_addr_t)value, &name, &offset);
84 if (name != NULL && offset <= (unsigned long)db_maxoff &&
86 db_printf("\t%s", name);
88 db_printf("+%+#lr", (long)offset);
92 db_print_loc_and_inst(PC_REGS());