gdb/gdbserver/linux-mips-low.c

   1 /* GNU/Linux/MIPS 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 int num_regs = 90;
  30
  31 #include <asm/ptrace.h>
  32
  33 /* Return the ptrace ``address'' of register REGNO. */
  34
  35 /* Matches mips_generic32_regs */
  36 int regmap[] = {
  37   0,  1,  2,  3,  4,  5,  6,  7,
  38   8,  9,  10, 11, 12, 13, 14, 15,
  39   16, 17, 18, 19, 20, 21, 22, 23,
  40   24, 25, 26, 27, 28, 29, 30, 31,
  41
  42   -1, MMLO, MMHI, BADVADDR, CAUSE, PC,
  43
  44   FPR_BASE,      FPR_BASE + 1,  FPR_BASE + 2,  FPR_BASE + 3,
  45   FPR_BASE + 4,  FPR_BASE + 5,  FPR_BASE + 6,  FPR_BASE + 7,
  46   FPR_BASE + 8,  FPR_BASE + 8,  FPR_BASE + 10, FPR_BASE + 11,
  47   FPR_BASE + 12, FPR_BASE + 13, FPR_BASE + 14, FPR_BASE + 15,
  48   FPR_BASE + 16, FPR_BASE + 17, FPR_BASE + 18, FPR_BASE + 19,
  49   FPR_BASE + 20, FPR_BASE + 21, FPR_BASE + 22, FPR_BASE + 23,
  50   FPR_BASE + 24, FPR_BASE + 25, FPR_BASE + 26, FPR_BASE + 27,
  51   FPR_BASE + 28, FPR_BASE + 29, FPR_BASE + 30, FPR_BASE + 31,
  52   FPC_CSR, FPC_EIR,
  53
  54   -1, -1,
  55   -1, -1, -1, -1, -1, -1, -1, -1,
  56   -1, -1, -1, -1, -1, -1, -1, -1,
  57 };
  58
  59 /* From mips-linux-nat.c.  */
  60
  61 /* Pseudo registers can not be read.  ptrace does not provide a way to
  62    read (or set) PS_REGNUM, and there's no point in reading or setting
  63    ZERO_REGNUM.  We also can not set BADVADDR, CAUSE, or FCRIR via
  64    ptrace().  */
  65
  66 int
  67 cannot_fetch_register (int regno)
  68 {
  69   if (regmap[regno] == -1)
  70     return 1;
  71
  72   if (find_regno ("zero") == regno)
  73     return 1;
  74
  75   return 0;
  76 }
  77
  78 int
  79 cannot_store_register (int regno)
  80 {
  81   if (regmap[regno] == -1)
  82     return 1;
  83
  84   if (find_regno ("zero") == regno)
  85     return 1;
  86
  87   if (find_regno ("cause") == regno)
  88     return 1;
  89
  90   if (find_regno ("bad") == regno)
  91     return 1;
  92
  93   if (find_regno ("fir") == regno)
  94     return 1;
  95
  96   return 0;
  97 }