The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/i386/gdb_machdep.c

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    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 AUTHORS ``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 AUTHORS 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 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/6.2/sys/i386/i386/gdb_machdep.c 139724 2005-01-05 19:10:48Z imp $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kdb.h>
   33 #include <sys/kernel.h>
   34 #include <sys/proc.h>
   35 #include <sys/signal.h>
   36 
   37 #include <machine/gdb_machdep.h>
   38 #include <machine/pcb.h>
   39 #include <machine/trap.h>
   40 #include <machine/frame.h>
   41 #include <machine/endian.h>
   42 
   43 #include <gdb/gdb.h>
   44 
   45 void *
   46 gdb_cpu_getreg(int regnum, size_t *regsz)
   47 {
   48 
   49         *regsz = gdb_cpu_regsz(regnum);
   50 
   51         if (kdb_thread  == curthread) {
   52                 switch (regnum) {
   53                 case 0: return (&kdb_frame->tf_eax);
   54                 case 1: return (&kdb_frame->tf_ecx);
   55                 case 2: return (&kdb_frame->tf_edx);
   56                 }
   57         }
   58         switch (regnum) {
   59         case 3:  return (&kdb_thrctx->pcb_ebx);
   60         case 4:  return (&kdb_thrctx->pcb_esp);
   61         case 5:  return (&kdb_thrctx->pcb_ebp);
   62         case 6:  return (&kdb_thrctx->pcb_esi);
   63         case 7:  return (&kdb_thrctx->pcb_edi);
   64         case 8:  return (&kdb_thrctx->pcb_eip);
   65         }
   66         return (NULL);
   67 }
   68 
   69 void
   70 gdb_cpu_setreg(int regnum, void *val)
   71 {
   72 
   73         switch (regnum) {
   74         case GDB_REG_PC:
   75                 kdb_thrctx->pcb_eip = *(register_t *)val;
   76                 if (kdb_thread  == curthread)
   77                         kdb_frame->tf_eip = *(register_t *)val;
   78         }
   79 }
   80 
   81 int
   82 gdb_cpu_signal(int type, int code)
   83 {
   84 
   85         switch (type & ~T_USER) {
   86         case 0: return (SIGFPE);        /* Divide by zero. */
   87         case 1: return (SIGTRAP);       /* Debug exception. */
   88         case 3: return (SIGTRAP);       /* Breakpoint. */
   89         case 4: return (SIGURG);        /* into instr. (overflow). */
   90         case 5: return (SIGURG);        /* bound instruction. */
   91         case 6: return (SIGILL);        /* Invalid opcode. */
   92         case 7: return (SIGFPE);        /* Coprocessor not present. */
   93         case 8: return (SIGEMT);        /* Double fault. */
   94         case 9: return (SIGSEGV);       /* Coprocessor segment overrun. */
   95         case 10: return (SIGTRAP);      /* Invalid TSS (also single-step). */
   96         case 11: return (SIGSEGV);      /* Segment not present. */
   97         case 12: return (SIGSEGV);      /* Stack exception. */
   98         case 13: return (SIGSEGV);      /* General protection. */
   99         case 14: return (SIGSEGV);      /* Page fault. */
  100         case 16: return (SIGEMT);       /* Coprocessor error. */
  101         }
  102         return (SIGEMT);
  103 }

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