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/amd64/amd64/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/amd64/amd64/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/frame.h>
   38 #include <machine/gdb_machdep.h>
   39 #include <machine/pcb.h>
   40 #include <machine/psl.h>
   41 #include <machine/reg.h>
   42 #include <machine/trap.h>
   43 #include <machine/frame.h>
   44 #include <machine/endian.h>
   45 
   46 #include <gdb/gdb.h>
   47 
   48 void *
   49 gdb_cpu_getreg(int regnum, size_t *regsz)
   50 {
   51         static uint32_t _kcodesel = GSEL(GCODE_SEL, SEL_KPL);
   52         static uint32_t _kdatasel = GSEL(GDATA_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_rax);
   59                 case 2: return (&kdb_frame->tf_rcx);
   60                 case 3: return (&kdb_frame->tf_rdx);
   61                 case 4: return (&kdb_frame->tf_rsi);
   62                 case 5: return (&kdb_frame->tf_rdi);
   63                 case 8: return (&kdb_frame->tf_r8);
   64                 case 9: return (&kdb_frame->tf_r9);
   65                 case 10: return (&kdb_frame->tf_r10);
   66                 case 11: return (&kdb_frame->tf_r11);
   67                 case 17: return (&kdb_frame->tf_rflags);
   68                 case 18: return (&kdb_frame->tf_cs);
   69                 case 19: return (&kdb_frame->tf_ss);
   70                 }
   71         }
   72         switch (regnum) {
   73         case 1:  return (&kdb_thrctx->pcb_rbx);
   74         case 6:  return (&kdb_thrctx->pcb_rbp);
   75         case 7:  return (&kdb_thrctx->pcb_rsp);
   76         case 12: return (&kdb_thrctx->pcb_r12);
   77         case 13: return (&kdb_thrctx->pcb_r13);
   78         case 14: return (&kdb_thrctx->pcb_r14);
   79         case 15: return (&kdb_thrctx->pcb_r15);
   80         case 16: return (&kdb_thrctx->pcb_rip);
   81         case 18: return (&_kcodesel);
   82         case 19: return (&_kdatasel);
   83         }
   84         return (NULL);
   85 }
   86 
   87 void
   88 gdb_cpu_setreg(int regnum, void *val)
   89 {
   90 
   91         switch (regnum) {
   92         case GDB_REG_PC:
   93                 kdb_thrctx->pcb_rip = *(register_t *)val;
   94                 if (kdb_thread  == curthread)
   95                         kdb_frame->tf_rip = *(register_t *)val;
   96         }
   97 }
   98 
   99 int
  100 gdb_cpu_signal(int type, int code)
  101 {
  102 
  103         switch (type & ~T_USER) {
  104         case 0: return (SIGFPE);        /* Divide by zero. */
  105         case 1: return (SIGTRAP);       /* Debug exception. */
  106         case 3: return (SIGTRAP);       /* Breakpoint. */
  107         case 4: return (SIGSEGV);       /* into instr. (overflow). */
  108         case 5: return (SIGURG);        /* bound instruction. */
  109         case 6: return (SIGILL);        /* Invalid opcode. */
  110         case 7: return (SIGFPE);        /* Coprocessor not present. */
  111         case 8: return (SIGEMT);        /* Double fault. */
  112         case 9: return (SIGSEGV);       /* Coprocessor segment overrun. */
  113         case 10: return (SIGTRAP);      /* Invalid TSS (also single-step). */
  114         case 11: return (SIGSEGV);      /* Segment not present. */
  115         case 12: return (SIGSEGV);      /* Stack exception. */
  116         case 13: return (SIGSEGV);      /* General protection. */
  117         case 14: return (SIGSEGV);      /* Page fault. */
  118         case 16: return (SIGEMT);       /* Coprocessor error. */
  119         }
  120         return (SIGEMT);
  121 }

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