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/* GNU/Linux/ARM specific low level interface, for the remote server for GDB.

   Copyright (C) 1995, 1996, 1998, 1999, 2000, 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 "server.h"

#include "linux-low.h"

#include <sys/ptrace.h>

#include "gdb_proc_service.h"

#ifndef PTRACE_GET_THREAD_AREA

#define PTRACE_GET_THREAD_AREA 22

#endif

#ifndef PTRACE_GETWMMXREGS

# define PTRACE_GETWMMXREGS 18

# define PTRACE_SETWMMXREGS 19

#endif

#ifdef HAVE_SYS_REG_H

#include <sys/reg.h>

#endif

#define arm_num_regs 26

static int arm_regmap[] = {

  0, 4, 8, 12, 16, 20, 24, 28,

  32, 36, 40, 44, 48, 52, 56, 60,

  -1, -1, -1, -1, -1, -1, -1, -1, -1,

  64

};

static int

arm_cannot_store_register (int regno)

{

  return (regno >= arm_num_regs);

}

static int

arm_cannot_fetch_register (int regno)

{

  return (regno >= arm_num_regs);

}

static void

arm_fill_gregset (void *buf)

{

  int i;

  for (i = 0; i < arm_num_regs; i++)

    if (arm_regmap[i] != -1)

      collect_register (i, ((char *) buf) + arm_regmap[i]);

}

static void

arm_store_gregset (const void *buf)

{

  int i;

  char zerobuf[8];

  memset (zerobuf, 0, 8);

  for (i = 0; i < arm_num_regs; i++)

    if (arm_regmap[i] != -1)

      supply_register (i, ((char *) buf) + arm_regmap[i]);

    else

      supply_register (i, zerobuf);

}

#ifdef __IWMMXT__

static void

arm_fill_wmmxregset (void *buf)

{

  int i;

  for (i = 0; i < 16; i++)

    collect_register (arm_num_regs + i, (char *) buf + i * 8);

  /* We only have access to wcssf, wcasf, and wcgr0-wcgr3.  */

  for (i = 0; i < 6; i++)

    collect_register (arm_num_regs + i + 16, (char *) buf + 16 * 8 + i * 4);

}

static void

arm_store_wmmxregset (const void *buf)

{

  int i;

  for (i = 0; i < 16; i++)

    supply_register (arm_num_regs + i, (char *) buf + i * 8);

  /* We only have access to wcssf, wcasf, and wcgr0-wcgr3.  */

  for (i = 0; i < 6; i++)

    supply_register (arm_num_regs + i + 16, (char *) buf + 16 * 8 + i * 4);

}

#endif /* __IWMMXT__ */

extern int debug_threads;

static CORE_ADDR

arm_get_pc ()

{

  unsigned long pc;

  collect_register_by_name ("pc", &pc);

  if (debug_threads)

    fprintf (stderr, "stop pc is %08lx\n", pc);

  return pc;

}

static void

arm_set_pc (CORE_ADDR pc)

{

  unsigned long newpc = pc;

  supply_register_by_name ("pc", &newpc);

}

/* Correct in either endianness.  We do not support Thumb yet.  */

static const unsigned long arm_breakpoint = 0xef9f0001;

#define arm_breakpoint_len 4

/* For new EABI binaries.  We recognize it regardless of which ABI

   is used for gdbserver, so single threaded debugging should work

   OK, but for multi-threaded debugging we only insert the current

   ABI's breakpoint instruction.  For now at least.  */

static const unsigned long arm_eabi_breakpoint = 0xe7f001f0;

static int

arm_breakpoint_at (CORE_ADDR where)

{

  unsigned long insn;

  (*the_target->read_memory) (where, (unsigned char *) &insn, 4);

  if (insn == arm_breakpoint)

    return 1;

  if (insn == arm_eabi_breakpoint)

    return 1;

  /* If necessary, recognize more trap instructions here.  GDB only uses the

     two.  */

  return 0;

}

/* 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_ADDR

arm_reinsert_addr ()

{

  unsigned long pc;

  collect_register_by_name ("lr", &pc);

  return pc;

}

/* 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;

}

struct regset_info target_regsets[] = {

  { PTRACE_GETREGS, PTRACE_SETREGS, 18 * 4,

    GENERAL_REGS,

    arm_fill_gregset, arm_store_gregset },

#ifdef __IWMMXT__

  { PTRACE_GETWMMXREGS, PTRACE_SETWMMXREGS, 16 * 8 + 6 * 4,

    EXTENDED_REGS,

    arm_fill_wmmxregset, arm_store_wmmxregset },

#endif

  { 0, 0, -1, -1, NULL, NULL }

};

struct linux_target_ops the_low_target = {

  arm_num_regs,

  arm_regmap,

  arm_cannot_fetch_register,

  arm_cannot_store_register,

  arm_get_pc,

  arm_set_pc,

#ifndef __ARM_EABI__

  (const unsigned char *) &arm_breakpoint,

#else

  (const unsigned char *) &arm_eabi_breakpoint,

#endif

  arm_breakpoint_len,

  arm_reinsert_addr,

  0,

  arm_breakpoint_at,

};