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 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