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/arm/arm/gdb_machdep.c

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    1 /*-
    2  * Copyright (c) 2006 Olivier Houchard
    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/9.1/sys/arm/arm/gdb_machdep.c 198944 2009-11-05 06:31:50Z marcel $");
   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/gdb_machdep.h>
   39 #include <machine/db_machdep.h>
   40 #include <machine/vmparam.h>
   41 #include <machine/pcb.h>
   42 #include <machine/trap.h>
   43 #include <machine/frame.h>
   44 #include <machine/endian.h>
   45 
   46 #include <gdb/gdb.h>
   47 
   48 static register_t stacktest;
   49 
   50 void *
   51 gdb_cpu_getreg(int regnum, size_t *regsz)
   52 {
   53 
   54         *regsz = gdb_cpu_regsz(regnum);
   55 
   56         if (kdb_thread == curthread) {
   57                 if (regnum < 15)
   58                         return (&kdb_frame->tf_r0 + regnum);
   59                 if (regnum == 15)
   60                         return (&kdb_frame->tf_pc);
   61                 if (regnum == 25)
   62                         return (&kdb_frame->tf_spsr);
   63         }
   64 
   65         switch (regnum) {
   66         case 8:  return (&kdb_thrctx->un_32.pcb32_r8);
   67         case 9:  return (&kdb_thrctx->un_32.pcb32_r9);
   68         case 10:  return (&kdb_thrctx->un_32.pcb32_r10);
   69         case 11:  return (&kdb_thrctx->un_32.pcb32_r11);
   70         case 12:  return (&kdb_thrctx->un_32.pcb32_r12);
   71         case 13:  stacktest = kdb_thrctx->un_32.pcb32_sp + 5 * 4;
   72                   return (&stacktest);
   73         case 15: 
   74                   /* 
   75                    * On context switch, the PC is not put in the PCB, but
   76                    * we can retrieve it from the stack.
   77                    */
   78                   if (kdb_thrctx->un_32.pcb32_sp > KERNBASE) {
   79                           kdb_thrctx->un_32.pcb32_pc = *(register_t *)
   80                               (kdb_thrctx->un_32.pcb32_sp + 4 * 4);
   81                           return (&kdb_thrctx->un_32.pcb32_pc);
   82                   }
   83         }
   84 
   85         return (NULL);
   86 }
   87 
   88 void
   89 gdb_cpu_setreg(int regnum, void *val)
   90 {
   91 
   92         switch (regnum) {
   93         case GDB_REG_PC:
   94                 if (kdb_thread  == curthread)
   95                         kdb_frame->tf_pc = *(register_t *)val;
   96         }
   97 }
   98 
   99 int
  100 gdb_cpu_signal(int type, int code)
  101 {
  102 
  103         switch (type) {
  104         case T_BREAKPOINT: return (SIGTRAP);
  105         }
  106         return (SIGEMT);
  107 }

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