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 #include <machine/reg.h>
   42 
   43 #include <machine/hid.h>
   44 #include <machine/spr.h>
   45 
   46 #include <machine/trap.h>
   47 
   48 #include <gdb/gdb.h>
   49 #include <gdb/gdb_int.h>
   50 
   51 extern vm_offset_t __startkernel;
   52 
   53 void *
   54 gdb_cpu_getreg(int regnum, size_t *regsz)
   55 {
   56 
   57         *regsz = gdb_cpu_regsz(regnum);
   58 
   59         if (kdb_thread == curthread) {
   60                 if (regnum == 0 || (regnum >= 2 && regnum <= 31))
   61                         return (kdb_frame->fixreg + regnum);
   62                 if (regnum == 64)
   63                         return (&kdb_frame->srr0);
   64                 if (regnum == 67)
   65                         return (&kdb_frame->lr);
   66         }
   67 
   68         if (regnum == 1)
   69                 return (&kdb_thrctx->pcb_sp);
   70         if (regnum == 2 && *regsz == 8)
   71                 return (&kdb_thrctx->pcb_toc);
   72         if (regnum >= 12 && regnum <= 31)
   73                 return (kdb_thrctx->pcb_context + (regnum - 12));
   74         if (regnum == 64)
   75                 return (&kdb_thrctx->pcb_lr);
   76 
   77         return (NULL);
   78 }
   79 
   80 void
   81 gdb_cpu_setreg(int regnum, void *val)
   82 {
   83 
   84         switch (regnum) {
   85         case GDB_REG_PC:
   86                 break;
   87         }
   88 }
   89 
   90 int
   91 gdb_cpu_signal(int vector, int dummy __unused)
   92 {
   93 #if defined(BOOKE)
   94         if (vector == EXC_DEBUG || vector == EXC_PGM)
   95                 return (SIGTRAP);
   96 #else
   97         if (vector == EXC_TRC || vector == EXC_RUNMODETRC)
   98                 return (SIGTRAP);
   99 #endif
  100 
  101         return (SIGEMT);
  102 }
  103 
  104 void
  105 gdb_cpu_do_offsets(void)
  106 {
  107         /*
  108          * On PowerPC, .text starts at KERNBASE + SIZEOF_HEADERS and
  109          * text segment at KERNBASE - SIZEOF_HEADERS.
  110          * On PowerPC64, .text starts at KERNBASE and text segment at
  111          * KERNBASE - 0x100.
  112          * In both cases, the text segment offset is aligned to 64KB.
  113          *
  114          * The __startkernel variable holds the relocated KERNBASE offset.
  115          * Thus, as long as SIZEOF_HEADERS doesn't get bigger than 0x100
  116          * (which would lead to other issues), aligning __startkernel to
  117          * 64KB gives the text segment offset.
  118          *
  119          * TODO: Add DataSeg to response. On PowerPC64 all sections reside
  120          * in a single LOAD segment, but on PowerPC modifiable data reside
  121          * in a separate segment, that GDB should also relocate.
  122          */
  123         gdb_tx_begin(0);
  124         gdb_tx_str("TextSeg=");
  125         gdb_tx_varhex(__startkernel & ~0xffff);
  126         gdb_tx_end();
  127 }

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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