gdb_machdep.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2020 The FreeBSD Foundation
    5  *
    6  * This software was developed by Mitchell Horne under sponsorship from
    7  * the FreeBSD Foundation.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  * notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  * notice, this list of conditions and the following disclaimer in the
   16  * documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/kdb.h>
   34 #include <sys/kernel.h>
   35 #include <sys/proc.h>
   36 #include <sys/signal.h>
   37 
   38 #include <machine/armreg.h>
   39 #include <machine/frame.h>
   40 #include <machine/gdb_machdep.h>
   41 #include <machine/pcb.h>
   42 
   43 #include <gdb/gdb.h>
   44 #include <gdb/gdb_int.h>
   45 
   46 void *
   47 gdb_cpu_getreg(int regnum, size_t *regsz)
   48 {
   49 
   50         *regsz = gdb_cpu_regsz(regnum);
   51 
   52         if (kdb_thread == curthread) {
   53                 switch (regnum) {
   54                 case GDB_REG_LR:   return (&kdb_frame->tf_lr);
   55                 case GDB_REG_SP:   return (&kdb_frame->tf_sp);
   56                 case GDB_REG_PC:   return (&kdb_frame->tf_elr);
   57                 case GDB_REG_CSPR: return (&kdb_frame->tf_spsr);
   58                 }
   59         }
   60         switch (regnum) {
   61         case GDB_REG_SP: return (&kdb_thrctx->pcb_sp);
   62         case GDB_REG_PC: /* FALLTHROUGH */
   63         case GDB_REG_LR: return (&kdb_thrctx->pcb_lr);
   64         default:
   65                 if (regnum >= GDB_REG_X0 && regnum <= GDB_REG_X29)
   66                         return (&kdb_thrctx->pcb_x[regnum]);
   67                 break;
   68         }
   69 
   70         return (NULL);
   71 }
   72 
   73 void
   74 gdb_cpu_setreg(int regnum, void *val)
   75 {
   76         register_t regval = *(register_t *)val;
   77 
   78         /* For curthread, keep the pcb and trapframe in sync. */
   79         if (kdb_thread == curthread) {
   80                 switch (regnum) {
   81                 case GDB_REG_PC: kdb_frame->tf_elr = regval; break;
   82                 case GDB_REG_SP: kdb_frame->tf_sp  = regval; break;
   83                 default:
   84                         if (regnum >= GDB_REG_X0 && regnum <= GDB_REG_X29) {
   85                                 kdb_frame->tf_x[regnum] = regval;
   86                         }
   87                         break;
   88                 }
   89         }
   90         switch (regnum) {
   91         case GDB_REG_PC: /* FALLTHROUGH */
   92         case GDB_REG_LR: kdb_thrctx->pcb_lr = regval; break;
   93         case GDB_REG_SP: kdb_thrctx->pcb_sp = regval; break;
   94         default:
   95                 if (regnum >= GDB_REG_X0 && regnum <= GDB_REG_X29) {
   96                         kdb_thrctx->pcb_x[regnum] = regval;
   97                 }
   98                 break;
   99         }
  100 }
  101 
  102 int
  103 gdb_cpu_signal(int type, int code __unused)
  104 {
  105 
  106         switch (type) {
  107         case EXCP_WATCHPT_EL1:
  108         case EXCP_SOFTSTP_EL1:
  109         case EXCP_BRK:
  110                 return (SIGTRAP);
  111         }
  112         return (SIGEMT);
  113 }
  114 
  115 void
  116 gdb_cpu_stop_reason(int type, int code __unused)
  117 {
  118 
  119         if (type == EXCP_WATCHPT_EL1) {
  120                 gdb_tx_str("watch:");
  121                 gdb_tx_varhex((uintmax_t)READ_SPECIALREG(far_el1));
  122                 gdb_tx_char(';');
  123         }
  124 }

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FreeBSD/Linux Kernel Cross Reference sys/arm64/arm64/gdb_machdep.c

FreeBSD/Linux Kernel Cross Reference
sys/arm64/arm64/gdb_machdep.c