gnu/usr.bin/gdb/kgdb/trgt.c

   1 /*
   2  * Copyright (c) 2004 Marcel Moolenaar
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/gnu/usr.bin/gdb/kgdb/trgt.c,v 1.4 2005/09/10 18:25:53 marcel Exp $
  27  * $DragonFly: src/gnu/usr.bin/gdb/kgdb/trgt.c,v 1.2 2008/01/14 21:36:38 corecode Exp $
  28  */
  29
  30 #include <sys/cdefs.h>
  31
  32 #include <sys/param.h>
  33 /*#include <sys/proc.h>*/
  34 #include <sys/sysctl.h>
  35 #include <sys/user.h>
  36 #include <kvm.h>
  37
  38 #include <defs.h>
  39 #include <command.h>
  40 #include <frame-unwind.h>
  41 #include <gdbthread.h>
  42 #include <inferior.h>
  43 #include <regcache.h>
  44 #include <target.h>
  45
  46 #include "kgdb.h"
  47
  48 static struct target_ops kgdb_trgt_ops;
  49
  50 static char *
  51 kgdb_trgt_extra_thread_info(struct thread_info *ti)
  52 {
  53         static char buf[64];
  54         char *p, *s;
  55
  56         p = buf + snprintf(buf, sizeof(buf), "PID=%d", ptid_get_pid(ti->ptid));
  57         s = kgdb_thr_extra_thread_info(ptid_get_tid(ti->ptid));
  58         if (s != NULL)
  59                 snprintf(p, sizeof(buf) - (p - buf), ": %s", s);
  60         return (buf);
  61 }
  62
  63 static void
  64 kgdb_trgt_files_info(struct target_ops *target)
  65 {
  66         struct target_ops *tb;
  67
  68         tb = find_target_beneath(target);
  69         if (tb->to_files_info != NULL)
  70                 tb->to_files_info(tb);
  71 }
  72
  73 static void
  74 kgdb_trgt_find_new_threads(void)
  75 {
  76         struct target_ops *tb;
  77
  78         if (kvm != NULL)
  79                 return;
  80
  81         tb = find_target_beneath(&kgdb_trgt_ops);
  82         if (tb->to_find_new_threads != NULL)
  83                 tb->to_find_new_threads();
  84 }
  85
  86 static char *
  87 kgdb_trgt_pid_to_str(ptid_t ptid)
  88 {
  89         static char buf[33];
  90
  91         snprintf(buf, sizeof(buf), "Thread %#lx", ptid_get_tid(ptid));
  92         return (buf);
  93 }
  94
  95 static int
  96 kgdb_trgt_thread_alive(ptid_t ptid)
  97 {
  98         return (kgdb_thr_lookup_tid(ptid_get_tid(ptid)) != NULL);
  99 }
 100
 101 static LONGEST
 102 kgdb_trgt_xfer_partial(struct target_ops *ops, enum target_object object,
 103                        const char *annex, gdb_byte *readbuf,
 104                        const gdb_byte *writebuf,
 105                        ULONGEST offset, LONGEST len)
 106 {
 107         if (kvm != NULL) {
 108                 if (len == 0)
 109                         return (0);
 110                 if (writebuf != NULL)
 111                         return (kvm_write(kvm, offset, writebuf, len));
 112                 if (readbuf != NULL)
 113                         return (kvm_read(kvm, offset, readbuf, len));
 114         }
 115         return (ops->beneath->to_xfer_partial(ops->beneath, object, annex,
 116                                               readbuf, writebuf, offset, len));
 117 }
 118
 119 void
 120 kgdb_target(void)
 121 {
 122         struct kthr *kt;
 123         struct thread_info *ti;
 124
 125         kgdb_trgt_ops.to_magic = OPS_MAGIC;
 126         kgdb_trgt_ops.to_shortname = "kernel";
 127         kgdb_trgt_ops.to_longname = "kernel core files.";
 128         kgdb_trgt_ops.to_doc = "Kernel core files.";
 129         kgdb_trgt_ops.to_stratum = thread_stratum;
 130         kgdb_trgt_ops.to_has_memory = 1;
 131         kgdb_trgt_ops.to_has_registers = 1;
 132         kgdb_trgt_ops.to_has_stack = 1;
 133
 134         kgdb_trgt_ops.to_extra_thread_info = kgdb_trgt_extra_thread_info;
 135         kgdb_trgt_ops.to_fetch_registers = kgdb_trgt_fetch_registers;
 136         kgdb_trgt_ops.to_files_info = kgdb_trgt_files_info;
 137         kgdb_trgt_ops.to_find_new_threads = kgdb_trgt_find_new_threads;
 138         kgdb_trgt_ops.to_pid_to_str = kgdb_trgt_pid_to_str;
 139         kgdb_trgt_ops.to_store_registers = kgdb_trgt_store_registers;
 140         kgdb_trgt_ops.to_thread_alive = kgdb_trgt_thread_alive;
 141         kgdb_trgt_ops.to_xfer_partial = kgdb_trgt_xfer_partial;
 142         add_target(&kgdb_trgt_ops);
 143         push_target(&kgdb_trgt_ops);
 144
 145         kt = kgdb_thr_first();
 146         while (kt != NULL) {
 147                 ti = add_thread(ptid_build(kt->pid, 0, kt->tid));
 148                 kt = kgdb_thr_next(kt);
 149         }
 150         if (curkthr != 0)
 151                 inferior_ptid = ptid_build(curkthr->pid, 0, curkthr->tid);
 152 }