gdb/gdbserver/win32-arm-low.c

   1 /* Copyright (C) 2007, 2008 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include "server.h"
  19 #include "win32-low.h"
  20
  21 #ifndef CONTEXT_FLOATING_POINT
  22 #define CONTEXT_FLOATING_POINT 0
  23 #endif
  24
  25 static void
  26 arm_get_thread_context (win32_thread_info *th, DEBUG_EVENT* current_event)
  27 {
  28   th->context.ContextFlags = \
  29     CONTEXT_FULL | \
  30     CONTEXT_FLOATING_POINT;
  31
  32   GetThreadContext (th->h, &th->context);
  33 }
  34
  35 static void
  36 arm_set_thread_context (win32_thread_info *th, DEBUG_EVENT* current_event)
  37 {
  38   SetThreadContext (th->h, &th->context);
  39 }
  40
  41 #define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
  42 static const int mappings[] = {
  43   context_offset (R0),
  44   context_offset (R1),
  45   context_offset (R2),
  46   context_offset (R3),
  47   context_offset (R4),
  48   context_offset (R5),
  49   context_offset (R6),
  50   context_offset (R7),
  51   context_offset (R8),
  52   context_offset (R9),
  53   context_offset (R10),
  54   context_offset (R11),
  55   context_offset (R12),
  56   context_offset (Sp),
  57   context_offset (Lr),
  58   context_offset (Pc),
  59   -1, /* f0 */
  60   -1, /* f1 */
  61   -1, /* f2 */
  62   -1, /* f3 */
  63   -1, /* f4 */
  64   -1, /* f5 */
  65   -1, /* f6 */
  66   -1, /* f7 */
  67   -1, /* fps */
  68   context_offset (Psr),
  69 };
  70 #undef context_offset
  71
  72 /* Return a pointer into a CONTEXT field indexed by gdb register number.
  73    Return a pointer to an dummy register holding zero if there is no
  74    corresponding CONTEXT field for the given register number.  */
  75 static char *
  76 regptr (CONTEXT* c, int r)
  77 {
  78   if (mappings[r] < 0)
  79   {
  80     static ULONG zero;
  81     /* Always force value to zero, in case the user tried to write
  82        to this register before.  */
  83     zero = 0;
  84     return (char *) &zero;
  85   }
  86   else
  87     return (char *) c + mappings[r];
  88 }
  89
  90 /* Fetch register from gdbserver regcache data.  */
  91 static void
  92 arm_fetch_inferior_register (win32_thread_info *th, int r)
  93 {
  94   char *context_offset = regptr (&th->context, r);
  95   supply_register (r, context_offset);
  96 }
  97
  98 /* Store a new register value into the thread context of TH.  */
  99 static void
 100 arm_store_inferior_register (win32_thread_info *th, int r)
 101 {
 102   collect_register (r, regptr (&th->context, r));
 103 }
 104
 105 /* Correct in either endianness.  We do not support Thumb yet.  */
 106 static const unsigned long arm_wince_breakpoint = 0xe6000010;
 107 #define arm_wince_breakpoint_len 4
 108
 109 struct win32_target_ops the_low_target = {
 110   sizeof (mappings) / sizeof (mappings[0]),
 111   NULL, /* initial_stuff */
 112   arm_get_thread_context,
 113   arm_set_thread_context,
 114   NULL, /* thread_added */
 115   arm_fetch_inferior_register,
 116   arm_store_inferior_register,
 117   NULL, /* single_step */
 118   (const unsigned char *) &arm_wince_breakpoint,
 119   arm_wince_breakpoint_len,
 120   "arm" /* arch_string */
 121 };