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/10.3/sys/i386/i386/gdb_machdep.c 290734 2015-11-13 00:50:34Z jhb $");
   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         static uint32_t _kcodesel = GSEL(GCODE_SEL, SEL_KPL);
   49         static uint32_t _kdatasel = GSEL(GDATA_SEL, SEL_KPL);
   50         static uint32_t _kprivsel = GSEL(GPRIV_SEL, SEL_KPL);
   51 
   52         *regsz = gdb_cpu_regsz(regnum);
   53 
   54         if (kdb_thread == curthread) {
   55                 switch (regnum) {
   56                 case 0: return (&kdb_frame->tf_eax);
   57                 case 1: return (&kdb_frame->tf_ecx);
   58                 case 2: return (&kdb_frame->tf_edx);
   59                 case 9: return (&kdb_frame->tf_eflags);
   60                 case 10: return (&kdb_frame->tf_cs);
   61                 case 12: return (&kdb_frame->tf_ds);
   62                 case 13: return (&kdb_frame->tf_es);
   63                 case 14: return (&kdb_frame->tf_fs);
   64                 }
   65         }
   66         switch (regnum) {
   67         case 3:  return (&kdb_thrctx->pcb_ebx);
   68         case 4:  return (&kdb_thrctx->pcb_esp);
   69         case 5:  return (&kdb_thrctx->pcb_ebp);
   70         case 6:  return (&kdb_thrctx->pcb_esi);
   71         case 7:  return (&kdb_thrctx->pcb_edi);
   72         case 8:  return (&kdb_thrctx->pcb_eip);
   73         case 10: return (&_kcodesel);
   74         case 11: return (&_kdatasel);
   75         case 12: return (&_kdatasel);
   76         case 13: return (&_kdatasel);
   77         case 14: return (&_kprivsel);
   78         case 15: return (&kdb_thrctx->pcb_gs);
   79         }
   80         return (NULL);
   81 }
   82 
   83 void
   84 gdb_cpu_setreg(int regnum, void *val)
   85 {
   86 
   87         switch (regnum) {
   88         case GDB_REG_PC:
   89                 kdb_thrctx->pcb_eip = *(register_t *)val;
   90                 if (kdb_thread  == curthread)
   91                         kdb_frame->tf_eip = *(register_t *)val;
   92         }
   93 }
   94 
   95 int
   96 gdb_cpu_signal(int type, int code)
   97 {
   98 
   99         switch (type & ~T_USER) {
  100         case 0: return (SIGFPE);        /* Divide by zero. */
  101         case 1: return (SIGTRAP);       /* Debug exception. */
  102         case 3: return (SIGTRAP);       /* Breakpoint. */
  103         case 4: return (SIGURG);        /* into instr. (overflow). */
  104         case 5: return (SIGURG);        /* bound instruction. */
  105         case 6: return (SIGILL);        /* Invalid opcode. */
  106         case 7: return (SIGFPE);        /* Coprocessor not present. */
  107         case 8: return (SIGEMT);        /* Double fault. */
  108         case 9: return (SIGSEGV);       /* Coprocessor segment overrun. */
  109         case 10: return (SIGTRAP);      /* Invalid TSS (also single-step). */
  110         case 11: return (SIGSEGV);      /* Segment not present. */
  111         case 12: return (SIGSEGV);      /* Stack exception. */
  112         case 13: return (SIGSEGV);      /* General protection. */
  113         case 14: return (SIGSEGV);      /* Page fault. */
  114         case 16: return (SIGEMT);       /* Coprocessor error. */
  115         }
  116         return (SIGEMT);
  117 }

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