gdb/gdbserver/linux-arm-low.c

   1 /* GNU/Linux/ARM specific low level interface, for the remote server for GDB.
   2    Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "server.h"
  23 #include "linux-low.h"
  24
  25 #ifdef HAVE_SYS_REG_H
  26 #include <sys/reg.h>
  27 #endif
  28
  29 #define arm_num_regs 26
  30
  31 static int arm_regmap[] = {
  32   0, 4, 8, 12, 16, 20, 24, 28,
  33   32, 36, 40, 44, 48, 52, 56, 60,
  34   -1, -1, -1, -1, -1, -1, -1, -1, -1,
  35   64
  36 };
  37
  38 static int
  39 arm_cannot_store_register (int regno)
  40 {
  41   return (regno >= arm_num_regs);
  42 }
  43
  44 static int
  45 arm_cannot_fetch_register (int regno)
  46 {
  47   return (regno >= arm_num_regs);
  48 }
  49
  50 static CORE_ADDR
  51 arm_get_pc ()
  52 {
  53   unsigned long pc;
  54   collect_register_by_name ("pc", &pc);
  55   return pc;
  56 }
  57
  58 static void
  59 arm_set_pc (CORE_ADDR pc)
  60 {
  61   unsigned long newpc = pc;
  62   supply_register_by_name ("pc", &newpc);
  63 }
  64
  65 /* Correct in either endianness.  We do not support Thumb yet.  */
  66 static const unsigned long arm_breakpoint = 0xef9f0001;
  67 #define arm_breakpoint_len 4
  68
  69 static int
  70 arm_breakpoint_at (CORE_ADDR where)
  71 {
  72   unsigned long insn;
  73
  74   (*the_target->read_memory) (where, (char *) &insn, 4);
  75   if (insn == arm_breakpoint)
  76     return 1;
  77
  78   /* If necessary, recognize more trap instructions here.  GDB only uses the
  79      one.  */
  80   return 0;
  81 }
  82
  83 struct linux_target_ops the_low_target = {
  84   arm_num_regs,
  85   arm_regmap,
  86   arm_cannot_fetch_register,
  87   arm_cannot_store_register,
  88   arm_get_pc,
  89   arm_set_pc,
  90   (const char *) &arm_breakpoint,
  91   arm_breakpoint_len,
  92   NULL,
  93   0,
  94   arm_breakpoint_at,
  95 };