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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2004 Marcel Moolenaar
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  *
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/12.0/sys/i386/i386/gdb_machdep.c 326260 2017-11-27 15:08:52Z pfg $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/kdb.h>
   35 #include <sys/kernel.h>
   36 #include <sys/proc.h>
   37 #include <sys/signal.h>
   38 
   39 #include <machine/gdb_machdep.h>
   40 #include <machine/pcb.h>
   41 #include <machine/trap.h>
   42 #include <machine/frame.h>
   43 #include <machine/endian.h>
   44 
   45 #include <gdb/gdb.h>
   46 
   47 void *
   48 gdb_cpu_getreg(int regnum, size_t *regsz)
   49 {
   50         static uint32_t _kcodesel = GSEL(GCODE_SEL, SEL_KPL);
   51         static uint32_t _kdatasel = GSEL(GDATA_SEL, SEL_KPL);
   52         static uint32_t _kprivsel = GSEL(GPRIV_SEL, SEL_KPL);
   53 
   54         *regsz = gdb_cpu_regsz(regnum);
   55 
   56         if (kdb_thread == curthread) {
   57                 switch (regnum) {
   58                 case 0: return (&kdb_frame->tf_eax);
   59                 case 1: return (&kdb_frame->tf_ecx);
   60                 case 2: return (&kdb_frame->tf_edx);
   61                 case 9: return (&kdb_frame->tf_eflags);
   62                 case 10: return (&kdb_frame->tf_cs);
   63                 case 12: return (&kdb_frame->tf_ds);
   64                 case 13: return (&kdb_frame->tf_es);
   65                 case 14: return (&kdb_frame->tf_fs);
   66                 }
   67         }
   68         switch (regnum) {
   69         case 3:  return (&kdb_thrctx->pcb_ebx);
   70         case 4:  return (&kdb_thrctx->pcb_esp);
   71         case 5:  return (&kdb_thrctx->pcb_ebp);
   72         case 6:  return (&kdb_thrctx->pcb_esi);
   73         case 7:  return (&kdb_thrctx->pcb_edi);
   74         case 8:  return (&kdb_thrctx->pcb_eip);
   75         case 10: return (&_kcodesel);
   76         case 11: return (&_kdatasel);
   77         case 12: return (&_kdatasel);
   78         case 13: return (&_kdatasel);
   79         case 14: return (&_kprivsel);
   80         case 15: return (&kdb_thrctx->pcb_gs);
   81         }
   82         return (NULL);
   83 }
   84 
   85 void
   86 gdb_cpu_setreg(int regnum, void *val)
   87 {
   88 
   89         switch (regnum) {
   90         case GDB_REG_PC:
   91                 kdb_thrctx->pcb_eip = *(register_t *)val;
   92                 if (kdb_thread  == curthread)
   93                         kdb_frame->tf_eip = *(register_t *)val;
   94         }
   95 }
   96 
   97 int
   98 gdb_cpu_signal(int type, int code)
   99 {
  100 
  101         switch (type & ~T_USER) {
  102         case 0: return (SIGFPE);        /* Divide by zero. */
  103         case 1: return (SIGTRAP);       /* Debug exception. */
  104         case 3: return (SIGTRAP);       /* Breakpoint. */
  105         case 4: return (SIGURG);        /* into instr. (overflow). */
  106         case 5: return (SIGURG);        /* bound instruction. */
  107         case 6: return (SIGILL);        /* Invalid opcode. */
  108         case 7: return (SIGFPE);        /* Coprocessor not present. */
  109         case 8: return (SIGEMT);        /* Double fault. */
  110         case 9: return (SIGSEGV);       /* Coprocessor segment overrun. */
  111         case 10: return (SIGTRAP);      /* Invalid TSS (also single-step). */
  112         case 11: return (SIGSEGV);      /* Segment not present. */
  113         case 12: return (SIGSEGV);      /* Stack exception. */
  114         case 13: return (SIGSEGV);      /* General protection. */
  115         case 14: return (SIGSEGV);      /* Page fault. */
  116         case 16: return (SIGEMT);       /* Coprocessor error. */
  117         }
  118         return (SIGEMT);
  119 }

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