gdb_machdep.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2006 Olivier Houchard
    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("$FreeBSD$");
   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/db_machdep.h>
   41 #include <machine/vmparam.h>
   42 #include <machine/pcb.h>
   43 #include <machine/trap.h>
   44 #include <machine/frame.h>
   45 #include <machine/endian.h>
   46 
   47 #include <gdb/gdb.h>
   48 
   49 static register_t stacktest;
   50 
   51 void *
   52 gdb_cpu_getreg(int regnum, size_t *regsz)
   53 {
   54 
   55         *regsz = gdb_cpu_regsz(regnum);
   56 
   57         if (kdb_thread == curthread) {
   58                 if (regnum < 13)
   59                         return (&kdb_frame->tf_r0 + regnum);
   60                 if (regnum == 13)
   61                         return (&kdb_frame->tf_svc_sp);
   62                 if (regnum == 14)
   63                         return (&kdb_frame->tf_svc_lr);
   64                 if (regnum == 15)
   65                         return (&kdb_frame->tf_pc);
   66                 if (regnum == 25)
   67                         return (&kdb_frame->tf_spsr);
   68         }
   69 
   70         switch (regnum) {
   71         case 4:  return (&kdb_thrctx->pcb_regs.sf_r4);
   72         case 5:  return (&kdb_thrctx->pcb_regs.sf_r5);
   73         case 6:  return (&kdb_thrctx->pcb_regs.sf_r6);
   74         case 7:  return (&kdb_thrctx->pcb_regs.sf_r7);
   75         case 8:  return (&kdb_thrctx->pcb_regs.sf_r8);
   76         case 9:  return (&kdb_thrctx->pcb_regs.sf_r9);
   77         case 10:  return (&kdb_thrctx->pcb_regs.sf_r10);
   78         case 11:  return (&kdb_thrctx->pcb_regs.sf_r11);
   79         case 12:  return (&kdb_thrctx->pcb_regs.sf_r12);
   80         case 13:  stacktest = kdb_thrctx->pcb_regs.sf_sp + 5 * 4;
   81                   return (&stacktest);
   82         case 15:
   83                   /*
   84                    * On context switch, the PC is not put in the PCB, but
   85                    * we can retrieve it from the stack.
   86                    */
   87                   if (kdb_thrctx->pcb_regs.sf_sp > KERNBASE) {
   88                           kdb_thrctx->pcb_regs.sf_pc = *(register_t *)
   89                               (kdb_thrctx->pcb_regs.sf_sp + 4 * 4);
   90                           return (&kdb_thrctx->pcb_regs.sf_pc);
   91                   }
   92         }
   93 
   94         return (NULL);
   95 }
   96 
   97 void
   98 gdb_cpu_setreg(int regnum, void *val)
   99 {
  100         if (kdb_thread != curthread)
  101                 return;
  102 
  103         switch (regnum) {
  104         case GDB_REG_PC:
  105                 kdb_frame->tf_pc = *(register_t *)val;
  106                 break;
  107         case GDB_REG_SP:
  108                 kdb_frame->tf_svc_sp = *(register_t *)val;
  109                 break;
  110         case GDB_REG_LR:
  111                 kdb_frame->tf_svc_lr = *(register_t *)val;
  112                 break;
  113         default:
  114                 /* Write to the general purpose registers r0-r12. */
  115                 if (regnum >= 0 && regnum <= 12) {
  116                         *(&kdb_frame->tf_r0 + regnum) = *(register_t *)val;
  117                 }
  118                 break;
  119         }
  120 }
  121 
  122 int
  123 gdb_cpu_signal(int type, int code)
  124 {
  125 
  126         switch (type) {
  127         case T_BREAKPOINT: return (SIGTRAP);
  128         }
  129         return (SIGEMT);
  130 }

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

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