gdb_machdep.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2006 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("$FreeBSD$");
   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/pcb.h>
   41 
   42 #include <machine/hid.h>
   43 #include <machine/spr.h>
   44 
   45 #include <machine/trap.h>
   46 
   47 #include <gdb/gdb.h>
   48 #include <gdb/gdb_int.h>
   49 
   50 extern vm_offset_t __startkernel;
   51 
   52 void *
   53 gdb_cpu_getreg(int regnum, size_t *regsz)
   54 {
   55 
   56         *regsz = gdb_cpu_regsz(regnum);
   57 
   58         if (kdb_thread == curthread) {
   59                 if (regnum == 0 || (regnum >= 2 && regnum <= 31))
   60                         return (kdb_frame->fixreg + regnum);
   61                 if (regnum == 64)
   62                         return (&kdb_frame->srr0);
   63                 if (regnum == 67)
   64                         return (&kdb_frame->lr);
   65         }
   66 
   67         if (regnum == 1)
   68                 return (&kdb_thrctx->pcb_sp);
   69         if (regnum == 2 && *regsz == 8)
   70                 return (&kdb_thrctx->pcb_toc);
   71         if (regnum >= 12 && regnum <= 31)
   72                 return (kdb_thrctx->pcb_context + (regnum - 12));
   73         if (regnum == 64)
   74                 return (&kdb_thrctx->pcb_lr);
   75 
   76         return (NULL);
   77 }
   78 
   79 void
   80 gdb_cpu_setreg(int regnum, void *val)
   81 {
   82 
   83         switch (regnum) {
   84         case GDB_REG_PC:
   85                 break;
   86         }
   87 }
   88 
   89 int
   90 gdb_cpu_signal(int vector, int dummy __unused)
   91 {
   92 #if defined(BOOKE)
   93         if (vector == EXC_DEBUG || vector == EXC_PGM)
   94                 return (SIGTRAP);
   95 #else
   96         if (vector == EXC_TRC || vector == EXC_RUNMODETRC)
   97                 return (SIGTRAP);
   98 #endif
   99 
  100         return (SIGEMT);
  101 }
  102 
  103 void
  104 gdb_cpu_do_offsets(void)
  105 {
  106         /*
  107          * On PowerPC, .text starts at KERNBASE + SIZEOF_HEADERS and
  108          * text segment at KERNBASE - SIZEOF_HEADERS.
  109          * On PowerPC64, .text starts at KERNBASE and text segment at
  110          * KERNBASE - 0x100.
  111          * In both cases, the text segment offset is aligned to 64KB.
  112          *
  113          * The __startkernel variable holds the relocated KERNBASE offset.
  114          * Thus, as long as SIZEOF_HEADERS doesn't get bigger than 0x100
  115          * (which would lead to other issues), aligning __startkernel to
  116          * 64KB gives the text segment offset.
  117          *
  118          * TODO: Add DataSeg to response. On PowerPC64 all sections reside
  119          * in a single LOAD segment, but on PowerPC modifiable data reside
  120          * in a separate segment, that GDB should also relocate.
  121          */
  122         gdb_tx_begin(0);
  123         gdb_tx_str("TextSeg=");
  124         gdb_tx_varhex(__startkernel & ~0xffff);
  125         gdb_tx_end();
  126 }

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

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