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
  24 #ifdef HAVE_SYS_REG_H
  25 #include <sys/reg.h>
  26 #endif
  27
  28 int num_regs = 90;
  29
  30 #include <asm/ptrace.h>
  31
  32 /* Return the ptrace ``address'' of register REGNO. */
  33
  34 /* Matches mips_generic32_regs */
  35 int regmap[] = {
  36   0,  1,  2,  3,  4,  5,  6,  7,
  37   8,  9,  10, 11, 12, 13, 14, 15,
  38   16, 17, 18, 19, 20, 21, 22, 23,
  39   24, 25, 26, 27, 28, 29, 30, 31,
  40
  41   -1, MMLO, MMHI, BADVADDR, CAUSE, PC,
  42
  43   FPR_BASE,      FPR_BASE + 1,  FPR_BASE + 2,  FPR_BASE + 3,
  44   FPR_BASE + 4,  FPR_BASE + 5,  FPR_BASE + 6,  FPR_BASE + 7,
  45   FPR_BASE + 8,  FPR_BASE + 8,  FPR_BASE + 10, FPR_BASE + 11,
  46   FPR_BASE + 12, FPR_BASE + 13, FPR_BASE + 14, FPR_BASE + 15,
  47   FPR_BASE + 16, FPR_BASE + 17, FPR_BASE + 18, FPR_BASE + 19,
  48   FPR_BASE + 20, FPR_BASE + 21, FPR_BASE + 22, FPR_BASE + 23,
  49   FPR_BASE + 24, FPR_BASE + 25, FPR_BASE + 26, FPR_BASE + 27,
  50   FPR_BASE + 28, FPR_BASE + 29, FPR_BASE + 30, FPR_BASE + 31,
  51   FPC_CSR, FPC_EIR,
  52
  53   -1, -1,
  54   -1, -1, -1, -1, -1, -1, -1, -1,
  55   -1, -1, -1, -1, -1, -1, -1, -1,
  56 };
  57
  58 /* From mips-linux-nat.c.  */
  59
  60 /* Pseudo registers can not be read.  ptrace does not provide a way to
  61    read (or set) PS_REGNUM, and there's no point in reading or setting
  62    ZERO_REGNUM.  We also can not set BADVADDR, CAUSE, or FCRIR via
  63    ptrace().  */
  64
  65 int
  66 cannot_fetch_register (int regno)
  67 {
  68   struct reg *reg;
  69
  70   if (regmap[regno] == -1)
  71     return 1;
  72
  73   reg = find_register_by_number (regno);
  74
  75   if (strcmp (reg->name, "zero") == 0)
  76     return 1;
  77
  78   return 0;
  79 }
  80
  81 int
  82 cannot_store_register (int regno)
  83 {
  84   struct reg *reg;
  85
  86   if (regmap[regno] == -1)
  87     return 1;
  88
  89   reg = find_register_by_number (regno);
  90
  91   if (strcmp (reg->name, "zero") == 0)
  92     return 1;
  93
  94   if (strcmp (reg->name, "cause") == 0)
  95     return 1;
  96
  97   if (strcmp (reg->name, "bad") == 0)
  98     return 1;
  99
 100   if (strcmp (reg->name, "fir") == 0)
 101     return 1;
 102
 103   return 0;
 104 }