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/10.2/sys/arm/arm/gdb_machdep.c 278614 2015-02-12 04:15:55Z ian $");
   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 < 13)
   58                         return (&kdb_frame->tf_r0 + regnum);
   59                 if (regnum == 13)
   60                         return (&kdb_frame->tf_svc_sp);
   61                 if (regnum == 14)
   62                         return (&kdb_frame->tf_svc_lr);
   63                 if (regnum == 15)
   64                         return (&kdb_frame->tf_pc);
   65                 if (regnum == 25)
   66                         return (&kdb_frame->tf_spsr);
   67         }
   68 
   69         switch (regnum) {
   70         case 4:  return (&kdb_thrctx->pcb_regs.sf_r4);
   71         case 5:  return (&kdb_thrctx->pcb_regs.sf_r5);
   72         case 6:  return (&kdb_thrctx->pcb_regs.sf_r6);
   73         case 7:  return (&kdb_thrctx->pcb_regs.sf_r7);
   74         case 8:  return (&kdb_thrctx->pcb_regs.sf_r8);
   75         case 9:  return (&kdb_thrctx->pcb_regs.sf_r9);
   76         case 10:  return (&kdb_thrctx->pcb_regs.sf_r10);
   77         case 11:  return (&kdb_thrctx->pcb_regs.sf_r11);
   78         case 12:  return (&kdb_thrctx->pcb_regs.sf_r12);
   79         case 13:  stacktest = kdb_thrctx->pcb_regs.sf_sp + 5 * 4;
   80                   return (&stacktest);
   81         case 15:
   82                   /*
   83                    * On context switch, the PC is not put in the PCB, but
   84                    * we can retrieve it from the stack.
   85                    */
   86                   if (kdb_thrctx->pcb_regs.sf_sp > KERNBASE) {
   87                           kdb_thrctx->pcb_regs.sf_pc = *(register_t *)
   88                               (kdb_thrctx->pcb_regs.sf_sp + 4 * 4);
   89                           return (&kdb_thrctx->pcb_regs.sf_pc);
   90                   }
   91         }
   92 
   93         return (NULL);
   94 }
   95 
   96 void
   97 gdb_cpu_setreg(int regnum, void *val)
   98 {
   99 
  100         switch (regnum) {
  101         case GDB_REG_PC:
  102                 if (kdb_thread  == curthread)
  103                         kdb_frame->tf_pc = *(register_t *)val;
  104         }
  105 }
  106 
  107 int
  108 gdb_cpu_signal(int type, int code)
  109 {
  110 
  111         switch (type) {
  112         case T_BREAKPOINT: return (SIGTRAP);
  113         }
  114         return (SIGEMT);
  115 }

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