/* GNU/Linux/MIPS specific low level interface, for the remote server for GDB.   Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002   Free Software Foundation, Inc.   This file is part of GDB.   This program is free software; you can redistribute it and/or modify   it under the terms of the GNU General Public License as published by   the Free Software Foundation; either version 2 of the License, or   (at your option) any later version.   This program is distributed in the hope that it will be useful,   but WITHOUT ANY WARRANTY; without even the implied warranty of   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the   GNU General Public License for more details.   You should have received a copy of the GNU General Public License   along with this program; if not, write to the Free Software   Foundation, Inc., 59 Temple Place - Suite 330,   Boston, MA 02111-1307, USA.  */#include "server.h"#include "linux-low.h"#ifdef HAVE_SYS_REG_H#include <sys/reg.h>#endif#define mips_num_regs 90#include <asm/ptrace.h>/* Return the ptrace ``address'' of register REGNO. *//* Matches mips_generic32_regs */static int mips_regmap[] = {  0,  1,  2,  3,  4,  5,  6,  7,  8,  9,  10, 11, 12, 13, 14, 15,  16, 17, 18, 19, 20, 21, 22, 23,  24, 25, 26, 27, 28, 29, 30, 31,  -1, MMLO, MMHI, BADVADDR, CAUSE, PC,  FPR_BASE,      FPR_BASE + 1,  FPR_BASE + 2,  FPR_BASE + 3,  FPR_BASE + 4,  FPR_BASE + 5,  FPR_BASE + 6,  FPR_BASE + 7,  FPR_BASE + 8,  FPR_BASE + 8,  FPR_BASE + 10, FPR_BASE + 11,  FPR_BASE + 12, FPR_BASE + 13, FPR_BASE + 14, FPR_BASE + 15,  FPR_BASE + 16, FPR_BASE + 17, FPR_BASE + 18, FPR_BASE + 19,  FPR_BASE + 20, FPR_BASE + 21, FPR_BASE + 22, FPR_BASE + 23,  FPR_BASE + 24, FPR_BASE + 25, FPR_BASE + 26, FPR_BASE + 27,  FPR_BASE + 28, FPR_BASE + 29, FPR_BASE + 30, FPR_BASE + 31,  FPC_CSR, FPC_EIR,  -1, -1,  -1, -1, -1, -1, -1, -1, -1, -1,  -1, -1, -1, -1, -1, -1, -1, -1,};/* From mips-linux-nat.c.  *//* Pseudo registers can not be read.  ptrace does not provide a way to   read (or set) PS_REGNUM, and there's no point in reading or setting   ZERO_REGNUM.  We also can not set BADVADDR, CAUSE, or FCRIR via   ptrace().  */static intmips_cannot_fetch_register (int regno){  if (mips_regmap[regno] == -1)    return 1;  if (find_regno ("zero") == regno)    return 1;  return 0;}static intmips_cannot_store_register (int regno){  if (mips_regmap[regno] == -1)    return 1;  if (find_regno ("zero") == regno)    return 1;  if (find_regno ("cause") == regno)    return 1;  if (find_regno ("bad") == regno)    return 1;  if (find_regno ("fir") == regno)    return 1;  return 0;}static CORE_ADDRmips_get_pc (){  unsigned long pc;  collect_register_by_name ("pc", &pc);  return pc;}static voidmips_set_pc (CORE_ADDR pc){  unsigned long newpc = pc;  supply_register_by_name ("pc", &newpc);}/* Correct in either endianness.  */static const unsigned long mips_breakpoint = 0x0005000d;#define mips_breakpoint_len 4/* We only place breakpoints in empty marker functions, and thread locking   is outside of the function.  So rather than importing software single-step,   we can just run until exit.  */static CORE_ADDRmips_reinsert_addr (){  unsigned long pc;  collect_register_by_name ("ra", &pc);  return pc;}static intmips_breakpoint_at (CORE_ADDR where){  unsigned long insn;  (*the_target->read_memory) (where, (char *) &insn, 4);  if (insn == mips_breakpoint)    return 1;  /* If necessary, recognize more trap instructions here.  GDB only uses the     one.  */  return 0;}struct linux_target_ops the_low_target = {  mips_num_regs,  mips_regmap,  mips_cannot_fetch_register,  mips_cannot_store_register,  mips_get_pc,  mips_set_pc,  (const char *) &mips_breakpoint,  mips_breakpoint_len,  mips_reinsert_addr,  0,  mips_breakpoint_at,};