gdb/gdbserver/win32-arm-low.c

   1 /* Copyright (C) 2007-2017 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 /* Defined in auto-generated file reg-arm.c.  */
  26 void init_registers_arm (void);
  27 extern const struct target_desc *tdesc_arm;
  28
  29 static void
  30 arm_get_thread_context (win32_thread_info *th)
  31 {
  32   th->context.ContextFlags = \
  33     CONTEXT_FULL | \
  34     CONTEXT_FLOATING_POINT;
  35
  36   GetThreadContext (th->h, &th->context);
  37 }
  38
  39 #define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
  40 static const int mappings[] = {
  41   context_offset (R0),
  42   context_offset (R1),
  43   context_offset (R2),
  44   context_offset (R3),
  45   context_offset (R4),
  46   context_offset (R5),
  47   context_offset (R6),
  48   context_offset (R7),
  49   context_offset (R8),
  50   context_offset (R9),
  51   context_offset (R10),
  52   context_offset (R11),
  53   context_offset (R12),
  54   context_offset (Sp),
  55   context_offset (Lr),
  56   context_offset (Pc),
  57   -1, /* f0 */
  58   -1, /* f1 */
  59   -1, /* f2 */
  60   -1, /* f3 */
  61   -1, /* f4 */
  62   -1, /* f5 */
  63   -1, /* f6 */
  64   -1, /* f7 */
  65   -1, /* fps */
  66   context_offset (Psr),
  67 };
  68 #undef context_offset
  69
  70 /* Return a pointer into a CONTEXT field indexed by gdb register number.
  71    Return a pointer to an dummy register holding zero if there is no
  72    corresponding CONTEXT field for the given register number.  */
  73 static char *
  74 regptr (CONTEXT* c, int r)
  75 {
  76   if (mappings[r] < 0)
  77   {
  78     static ULONG zero;
  79     /* Always force value to zero, in case the user tried to write
  80        to this register before.  */
  81     zero = 0;
  82     return (char *) &zero;
  83   }
  84   else
  85     return (char *) c + mappings[r];
  86 }
  87
  88 /* Fetch register from gdbserver regcache data.  */
  89 static void
  90 arm_fetch_inferior_register (struct regcache *regcache,
  91                              win32_thread_info *th, int r)
  92 {
  93   char *context_offset = regptr (&th->context, r);
  94   supply_register (regcache, r, context_offset);
  95 }
  96
  97 /* Store a new register value into the thread context of TH.  */
  98 static void
  99 arm_store_inferior_register (struct regcache *regcache,
 100                              win32_thread_info *th, int r)
 101 {
 102   collect_register (regcache, r, regptr (&th->context, r));
 103 }
 104
 105 static void
 106 arm_arch_setup (void)
 107 {
 108   init_registers_arm ();
 109   win32_tdesc = tdesc_arm;
 110 }
 111
 112 /* Correct in either endianness.  We do not support Thumb yet.  */
 113 static const unsigned long arm_wince_breakpoint = 0xe6000010;
 114 #define arm_wince_breakpoint_len 4
 115
 116 struct win32_target_ops the_low_target = {
 117   arm_arch_setup,
 118   sizeof (mappings) / sizeof (mappings[0]),
 119   NULL, /* initial_stuff */
 120   arm_get_thread_context,
 121   NULL, /* prepare_to_resume */
 122   NULL, /* thread_added */
 123   arm_fetch_inferior_register,
 124   arm_store_inferior_register,
 125   NULL, /* single_step */
 126   (const unsigned char *) &arm_wince_breakpoint,
 127   arm_wince_breakpoint_len,
 128   /* Watchpoint related functions.  See target.h for comments.  */
 129   NULL, /* supports_z_point_type */
 130   NULL, /* insert_point */
 131   NULL, /* remove_point */
 132   NULL, /* stopped_by_watchpoint */
 133   NULL  /* stopped_data_address */
 134 };