db_print.c

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    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/cdefs.h>
   39 __FBSDID("$FreeBSD$");
   40 
   41 #include <sys/param.h>
   42 #include <sys/kdb.h>
   43 #include <sys/proc.h>
   44 
   45 #include <machine/pcb.h>
   46 
   47 #include <ddb/ddb.h>
   48 #include <ddb/db_variables.h>
   49 #include <ddb/db_sym.h>
   50 
   51 void
   52 db_show_regs(db_expr_t _1, bool _2, db_expr_t _3, char *modif)
   53 {
   54         struct trapframe *oldtf;
   55         struct db_variable *regp;
   56         db_expr_t value, offset;
   57         const char *name;
   58 
   59         /*
   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.
   63          *
   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.
   67          */
   68         oldtf = kdb_frame;
   69         if (modif[0] == 'u') {
   70                 if (curthread->td_frame == NULL ||
   71                     curthread->td_frame == oldtf) {
   72                         db_printf("previous trapframe unavailable");
   73                         return;
   74                 }
   75                 kdb_frame = curthread->td_frame;
   76         }
   77 
   78         for (regp = db_regs; regp < db_eregs; regp++) {
   79                 if (!db_read_variable(regp, &value))
   80                         continue;
   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 &&
   85                     offset != value) {
   86                         db_printf("\t%s", name);
   87                         if (offset != 0)
   88                                 db_printf("+%+#lr", (long)offset);
   89                 }
   90                 db_printf("\n");
   91         }
   92         db_print_loc_and_inst(PC_REGS());
   93 
   94         kdb_frame = oldtf;
   95 }

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FreeBSD/Linux Kernel Cross Reference sys/ddb/db_print.c

FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_print.c