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/* Native-dependent code for GNU/Linux on MIPS processors.

   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008

   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 3 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, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include "inferior.h"

#include "mips-tdep.h"

#include "target.h"

#include "regcache.h"

#include "linux-nat.h"

#include "mips-linux-tdep.h"

#include "target-descriptions.h"

#include "gdb_proc_service.h"

#include "gregset.h"

#include <sgidefs.h>

#include <sys/ptrace.h>

#include "features/mips-linux.c"

#include "features/mips64-linux.c"

#ifndef PTRACE_GET_THREAD_AREA

#define PTRACE_GET_THREAD_AREA 25

#endif

/* Assume that we have PTRACE_GETREGS et al. support.  If we do not,

   we'll clear this and use PTRACE_PEEKUSER instead.  */

static int have_ptrace_regsets = 1;

/* Saved function pointers to fetch and store a single register using

   PTRACE_PEEKUSER and PTRACE_POKEUSER.  */

void (*super_fetch_registers) (struct regcache *, int);

void (*super_store_registers) (struct regcache *, int);

/* Map gdb internal register number to ptrace ``address''.

   These ``addresses'' are normally defined in <asm/ptrace.h>.

   ptrace does not provide a way to read (or set) MIPS_PS_REGNUM,

   and there's no point in reading or setting MIPS_ZERO_REGNUM.

   We also can not set BADVADDR, CAUSE, or FCRIR via ptrace().  */

static CORE_ADDR

mips_linux_register_addr (struct gdbarch *gdbarch, int regno, int store)

{

  CORE_ADDR regaddr;

  if (regno < 0 || regno >= gdbarch_num_regs (gdbarch))

    error (_("Bogon register number %d."), regno);

  if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)

    regaddr = regno;

  else if ((regno >= mips_regnum (gdbarch)->fp0)

           && (regno < mips_regnum (gdbarch)->fp0 + 32))

    regaddr = FPR_BASE + (regno - mips_regnum (gdbarch)->fp0);

  else if (regno == mips_regnum (gdbarch)->pc)

    regaddr = PC;

  else if (regno == mips_regnum (gdbarch)->cause)

    regaddr = store? (CORE_ADDR) -1 : CAUSE;

  else if (regno == mips_regnum (gdbarch)->badvaddr)

    regaddr = store? (CORE_ADDR) -1 : BADVADDR;

  else if (regno == mips_regnum (gdbarch)->lo)

    regaddr = MMLO;

  else if (regno == mips_regnum (gdbarch)->hi)

    regaddr = MMHI;

  else if (regno == mips_regnum (gdbarch)->fp_control_status)

    regaddr = FPC_CSR;

  else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)

    regaddr = store? (CORE_ADDR) -1 : FPC_EIR;

  else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM)

    regaddr = 0;

  else

    regaddr = (CORE_ADDR) -1;

  return regaddr;

}

static CORE_ADDR

mips64_linux_register_addr (struct gdbarch *gdbarch, int regno, int store)

{

  CORE_ADDR regaddr;

  if (regno < 0 || regno >= gdbarch_num_regs (gdbarch))

    error (_("Bogon register number %d."), regno);

  if (regno > MIPS_ZERO_REGNUM && regno < MIPS_ZERO_REGNUM + 32)

    regaddr = regno;

  else if ((regno >= mips_regnum (gdbarch)->fp0)

           && (regno < mips_regnum (gdbarch)->fp0 + 32))

    regaddr = MIPS64_FPR_BASE + (regno - gdbarch_fp0_regnum (gdbarch));

  else if (regno == mips_regnum (gdbarch)->pc)

    regaddr = MIPS64_PC;

  else if (regno == mips_regnum (gdbarch)->cause)

    regaddr = store? (CORE_ADDR) -1 : MIPS64_CAUSE;

  else if (regno == mips_regnum (gdbarch)->badvaddr)

    regaddr = store? (CORE_ADDR) -1 : MIPS64_BADVADDR;

  else if (regno == mips_regnum (gdbarch)->lo)

    regaddr = MIPS64_MMLO;

  else if (regno == mips_regnum (gdbarch)->hi)

    regaddr = MIPS64_MMHI;

  else if (regno == mips_regnum (gdbarch)->fp_control_status)

    regaddr = MIPS64_FPC_CSR;

  else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)

    regaddr = store? (CORE_ADDR) -1 : MIPS64_FPC_EIR;

  else if (mips_linux_restart_reg_p (gdbarch) && regno == MIPS_RESTART_REGNUM)

    regaddr = 0;

  else

    regaddr = (CORE_ADDR) -1;

  return regaddr;

}

/* Fetch the thread-local storage pointer for libthread_db.  */

ps_err_e

ps_get_thread_area (const struct ps_prochandle *ph,

                    lwpid_t lwpid, int idx, void **base)

{

  if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)

    return PS_ERR;

  /* IDX is the bias from the thread pointer to the beginning of the

     thread descriptor.  It has to be subtracted due to implementation

     quirks in libthread_db.  */

  *base = (void *) ((char *)*base - idx);

  return PS_OK;

}

/* Wrapper functions.  These are only used by libthread_db.  */

void

supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)

{

  if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)

    mips_supply_gregset (regcache, (const mips_elf_gregset_t *) gregsetp);

  else

    mips64_supply_gregset (regcache, (const mips64_elf_gregset_t *) gregsetp);

}

void

fill_gregset (const struct regcache *regcache,

              gdb_gregset_t *gregsetp, int regno)

{

  if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)

    mips_fill_gregset (regcache, (mips_elf_gregset_t *) gregsetp, regno);

  else

    mips64_fill_gregset (regcache, (mips64_elf_gregset_t *) gregsetp, regno);

}

void

supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)

{

  if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)

    mips_supply_fpregset (regcache, (const mips_elf_fpregset_t *) fpregsetp);

  else

    mips64_supply_fpregset (regcache, (const mips64_elf_fpregset_t *) fpregsetp);

}

void

fill_fpregset (const struct regcache *regcache,

               gdb_fpregset_t *fpregsetp, int regno)

{

  if (mips_isa_regsize (get_regcache_arch (regcache)) == 4)

    mips_fill_fpregset (regcache, (mips_elf_fpregset_t *) fpregsetp, regno);

  else

    mips64_fill_fpregset (regcache, (mips64_elf_fpregset_t *) fpregsetp, regno);

}

/* Fetch REGNO (or all registers if REGNO == -1) from the target

   using PTRACE_GETREGS et al.  */

static void

mips64_linux_regsets_fetch_registers (struct regcache *regcache, int regno)

{

  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  int is_fp;

  int tid;

  if (regno >= mips_regnum (gdbarch)->fp0

      && regno <= mips_regnum (gdbarch)->fp0 + 32)

    is_fp = 1;

  else if (regno == mips_regnum (gdbarch)->fp_control_status)

    is_fp = 1;

  else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)

    is_fp = 1;

  else

    is_fp = 0;

  tid = ptid_get_lwp (inferior_ptid);

  if (tid == 0)

    tid = ptid_get_pid (inferior_ptid);

  if (regno == -1 || !is_fp)

    {

      mips64_elf_gregset_t regs;

      if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) &regs) == -1)

        {

          if (errno == EIO)

            {

              have_ptrace_regsets = 0;

              return;

            }

          perror_with_name (_("Couldn't get registers"));

        }

      mips64_supply_gregset (regcache,

                             (const mips64_elf_gregset_t *) &regs);

    }

  if (regno == -1 || is_fp)

    {

      mips64_elf_fpregset_t fp_regs;

      if (ptrace (PTRACE_GETFPREGS, tid, 0L,

                  (PTRACE_TYPE_ARG3) &fp_regs) == -1)

        {

          if (errno == EIO)

            {

              have_ptrace_regsets = 0;

              return;

            }

          perror_with_name (_("Couldn't get FP registers"));

        }

      mips64_supply_fpregset (regcache,

                              (const mips64_elf_fpregset_t *) &fp_regs);

    }

}

/* Store REGNO (or all registers if REGNO == -1) to the target

   using PTRACE_SETREGS et al.  */

static void

mips64_linux_regsets_store_registers (const struct regcache *regcache, int regno)

{

  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  int is_fp;

  int tid;

  if (regno >= mips_regnum (gdbarch)->fp0

      && regno <= mips_regnum (gdbarch)->fp0 + 32)

    is_fp = 1;

  else if (regno == mips_regnum (gdbarch)->fp_control_status)

    is_fp = 1;

  else if (regno == mips_regnum (gdbarch)->fp_implementation_revision)

    is_fp = 1;

  else

    is_fp = 0;

  tid = ptid_get_lwp (inferior_ptid);

  if (tid == 0)

    tid = ptid_get_pid (inferior_ptid);

  if (regno == -1 || !is_fp)

    {

      mips64_elf_gregset_t regs;

      if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) &regs) == -1)

        perror_with_name (_("Couldn't get registers"));

      mips64_fill_gregset (regcache, &regs, regno);

      if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) &regs) == -1)

        perror_with_name (_("Couldn't set registers"));

    }

  if (regno == -1 || is_fp)

    {

      mips64_elf_fpregset_t fp_regs;

      if (ptrace (PTRACE_GETFPREGS, tid, 0L,

                  (PTRACE_TYPE_ARG3) &fp_regs) == -1)

        perror_with_name (_("Couldn't get FP registers"));

      mips64_fill_fpregset (regcache, &fp_regs, regno);

      if (ptrace (PTRACE_SETFPREGS, tid, 0L,

                  (PTRACE_TYPE_ARG3) &fp_regs) == -1)

        perror_with_name (_("Couldn't set FP registers"));

    }

}

/* Fetch REGNO (or all registers if REGNO == -1) from the target

   using any working method.  */

static void

mips64_linux_fetch_registers (struct regcache *regcache, int regnum)

{

  /* Unless we already know that PTRACE_GETREGS does not work, try it.  */

  if (have_ptrace_regsets)

    mips64_linux_regsets_fetch_registers (regcache, regnum);

  /* If we know, or just found out, that PTRACE_GETREGS does not work, fall

     back to PTRACE_PEEKUSER.  */

  if (!have_ptrace_regsets)

    super_fetch_registers (regcache, regnum);

}

/* Store REGNO (or all registers if REGNO == -1) to the target

   using any working method.  */

static void

mips64_linux_store_registers (struct regcache *regcache, int regnum)

{

  /* Unless we already know that PTRACE_GETREGS does not work, try it.  */

  if (have_ptrace_regsets)

    mips64_linux_regsets_store_registers (regcache, regnum);

  /* If we know, or just found out, that PTRACE_GETREGS does not work, fall

     back to PTRACE_PEEKUSER.  */

  if (!have_ptrace_regsets)

    super_store_registers (regcache, regnum);

}

/* Return the address in the core dump or inferior of register

   REGNO.  */

static CORE_ADDR

mips_linux_register_u_offset (struct gdbarch *gdbarch, int regno, int store_p)

{

  if (mips_abi_regsize (gdbarch) == 8)

    return mips64_linux_register_addr (gdbarch, regno, store_p);

  else

    return mips_linux_register_addr (gdbarch, regno, store_p);

}

static const struct target_desc *

mips_linux_read_description (struct target_ops *ops)

{

  /* Report that target registers are a size we know for sure

     that we can get from ptrace.  */

  if (_MIPS_SIM == _ABIO32)

    return tdesc_mips_linux;

  else

    return tdesc_mips64_linux;

}

void _initialize_mips_linux_nat (void);

void

_initialize_mips_linux_nat (void)

{

  struct target_ops *t = linux_trad_target (mips_linux_register_u_offset);

  super_fetch_registers = t->to_fetch_registers;

  super_store_registers = t->to_store_registers;

  t->to_fetch_registers = mips64_linux_fetch_registers;

  t->to_store_registers = mips64_linux_store_registers;

  t->to_read_description = mips_linux_read_description;

  linux_nat_add_target (t);

  /* Initialize the standard target descriptions.  */

  initialize_tdesc_mips_linux ();

  initialize_tdesc_mips64_linux ();

}