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  * 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: stable/12/sys/amd64/amd64/gdb_machdep.c 331252 2018-03-20 17:43:50Z kib $");
   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/cpufunc.h>
   40 #include <machine/frame.h>
   41 #include <machine/gdb_machdep.h>
   42 #include <machine/md_var.h>
   43 #include <machine/pcb.h>
   44 #include <machine/psl.h>
   45 #include <machine/reg.h>
   46 #include <machine/specialreg.h>
   47 #include <machine/trap.h>
   48 #include <machine/frame.h>
   49 #include <machine/endian.h>
   50 
   51 #include <gdb/gdb.h>
   52 
   53 void *
   54 gdb_cpu_getreg(int regnum, size_t *regsz)
   55 {
   56         static uint32_t _kcodesel = GSEL(GCODE_SEL, SEL_KPL);
   57         static uint32_t _kdatasel = GSEL(GDATA_SEL, SEL_KPL);
   58 
   59         *regsz = gdb_cpu_regsz(regnum);
   60 
   61         if (kdb_thread  == curthread) {
   62                 switch (regnum) {
   63                 case 0: return (&kdb_frame->tf_rax);
   64                 case 2: return (&kdb_frame->tf_rcx);
   65                 case 3: return (&kdb_frame->tf_rdx);
   66                 case 4: return (&kdb_frame->tf_rsi);
   67                 case 5: return (&kdb_frame->tf_rdi);
   68                 case 8: return (&kdb_frame->tf_r8);
   69                 case 9: return (&kdb_frame->tf_r9);
   70                 case 10: return (&kdb_frame->tf_r10);
   71                 case 11: return (&kdb_frame->tf_r11);
   72                 case 17: return (&kdb_frame->tf_rflags);
   73                 case 18: return (&kdb_frame->tf_cs);
   74                 case 19: return (&kdb_frame->tf_ss);
   75                 }
   76         }
   77         switch (regnum) {
   78         case 1:  return (&kdb_thrctx->pcb_rbx);
   79         case 6:  return (&kdb_thrctx->pcb_rbp);
   80         case 7:  return (&kdb_thrctx->pcb_rsp);
   81         case 12: return (&kdb_thrctx->pcb_r12);
   82         case 13: return (&kdb_thrctx->pcb_r13);
   83         case 14: return (&kdb_thrctx->pcb_r14);
   84         case 15: return (&kdb_thrctx->pcb_r15);
   85         case 16: return (&kdb_thrctx->pcb_rip);
   86         case 18: return (&_kcodesel);
   87         case 19: return (&_kdatasel);
   88         }
   89         return (NULL);
   90 }
   91 
   92 void
   93 gdb_cpu_setreg(int regnum, void *val)
   94 {
   95 
   96         switch (regnum) {
   97         case GDB_REG_PC:
   98                 kdb_thrctx->pcb_rip = *(register_t *)val;
   99                 if (kdb_thread  == curthread)
  100                         kdb_frame->tf_rip = *(register_t *)val;
  101         }
  102 }
  103 
  104 int
  105 gdb_cpu_signal(int type, int code)
  106 {
  107 
  108         switch (type & ~T_USER) {
  109         case 0: return (SIGFPE);        /* Divide by zero. */
  110         case 1: return (SIGTRAP);       /* Debug exception. */
  111         case 3: return (SIGTRAP);       /* Breakpoint. */
  112         case 4: return (SIGSEGV);       /* into instr. (overflow). */
  113         case 5: return (SIGURG);        /* bound instruction. */
  114         case 6: return (SIGILL);        /* Invalid opcode. */
  115         case 7: return (SIGFPE);        /* Coprocessor not present. */
  116         case 8: return (SIGEMT);        /* Double fault. */
  117         case 9: return (SIGSEGV);       /* Coprocessor segment overrun. */
  118         case 10: return (SIGTRAP);      /* Invalid TSS (also single-step). */
  119         case 11: return (SIGSEGV);      /* Segment not present. */
  120         case 12: return (SIGSEGV);      /* Stack exception. */
  121         case 13: return (SIGSEGV);      /* General protection. */
  122         case 14: return (SIGSEGV);      /* Page fault. */
  123         case 16: return (SIGEMT);       /* Coprocessor error. */
  124         }
  125         return (SIGEMT);
  126 }
  127 
  128 void *
  129 gdb_begin_write(void)
  130 {
  131 
  132         return (disable_wp() ? &gdb_begin_write : NULL);
  133 }
  134 
  135 void
  136 gdb_end_write(void *arg)
  137 {
  138 
  139         restore_wp(arg != NULL);
  140 }
  141 

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