db_interface.c

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    1 /*-
    2  * Copyright (c) 2001 Jake Burkholder.
    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  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/5.2/sys/sparc64/sparc64/db_interface.c 92205 2002-03-13 04:59:01Z jake $
   27  */
   28 
   29 #include <sys/param.h> 
   30 #include <sys/systm.h>
   31 #include <sys/reboot.h>
   32 #include <sys/cons.h>
   33 #include <sys/ktr.h>
   34 #include <sys/linker_set.h>
   35 #include <sys/lock.h>
   36 #include <sys/pcpu.h>
   37 #include <sys/proc.h>
   38 #include <sys/smp.h>
   39 
   40 #include <machine/cpu.h>
   41 #include <machine/md_var.h>
   42 
   43 #include <vm/vm.h>
   44 #include <vm/pmap.h>
   45 
   46 #include <ddb/ddb.h>
   47 #include <ddb/db_access.h>
   48 #include <ddb/db_sym.h>
   49 #include <ddb/db_variables.h>
   50 
   51 #include <machine/atomic.h>
   52 #include <machine/setjmp.h>
   53 
   54 static jmp_buf *db_nofault = 0;
   55 extern jmp_buf db_jmpbuf;
   56 
   57 int db_active;
   58 db_regs_t ddb_regs;
   59 
   60 static jmp_buf db_global_jmpbuf;
   61 static int db_global_jmpbuf_valid;
   62 
   63 int
   64 kdb_trap(struct trapframe *tf)
   65 {
   66 
   67         if (db_global_jmpbuf_valid)
   68                 longjmp(db_global_jmpbuf, 1);
   69         flushw();
   70         ddb_regs = *tf;
   71         critical_enter();
   72         setjmp(db_global_jmpbuf);
   73         db_global_jmpbuf_valid = TRUE;
   74         atomic_add_acq_int(&db_active, 1);
   75 #ifdef SMP
   76         stop_cpus(PCPU_GET(other_cpus));
   77 #endif
   78         cndbctl(TRUE);
   79         db_trap(tf->tf_type, 0);
   80         cndbctl(FALSE);
   81         db_active--;
   82 #ifdef SMP
   83         restart_cpus(stopped_cpus);
   84 #endif
   85         db_global_jmpbuf_valid = FALSE;
   86         critical_exit();
   87         *tf = ddb_regs;
   88         TF_DONE(tf);
   89         return (1);
   90 }
   91 
   92 void
   93 db_read_bytes(vm_offset_t addr, size_t size, char *data)
   94 {
   95         char *src;
   96 
   97         db_nofault = &db_jmpbuf;
   98         src = (char *)addr;
   99         while (size-- > 0)
  100                 *data++ = *src++;
  101         db_nofault = NULL;
  102 }
  103 
  104 void
  105 db_write_bytes(vm_offset_t addr, size_t size, char *data)
  106 {
  107         char *dst;
  108 
  109         db_nofault = &db_jmpbuf;
  110         dst = (char *)addr;
  111         while (size-- > 0)
  112                 *dst++ = *data++;
  113         db_nofault = NULL;
  114 }
  115 
  116 void
  117 db_show_mdpcpu(struct pcpu *pc)
  118 {
  119 }
  120 
  121 DB_COMMAND(reboot, db_reboot)
  122 {
  123         cpu_reset();
  124 }
  125 
  126 DB_COMMAND(halt, db_halt)
  127 {
  128         cpu_halt();
  129 }

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FreeBSD/Linux Kernel Cross Reference sys/sparc64/sparc64/db_interface.c

FreeBSD/Linux Kernel Cross Reference
sys/sparc64/sparc64/db_interface.c