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/* Xtensa GNU/Linux native support.

   Copyright (C) 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 "gdb_string.h"

#include "frame.h"

#include "inferior.h"

#include "gdbcore.h"

#include "regcache.h"

#include "gdb_assert.h"

#include "target.h"

#include "linux-nat.h"

#include <stdint.h>

#include <sys/types.h>

#include <sys/param.h>

#include <signal.h>

#include <sys/user.h>

#include <sys/ioctl.h>

#include "gdb_wait.h"

#include <fcntl.h>

#include <sys/procfs.h>

#include <sys/ptrace.h>

#include "gregset.h"

#include "xtensa-tdep.h"

/* Extended register set depends on hardware configs.

   Keeping these definitions separately allows to introduce

   hardware-specific overlays.  */

#include "xtensa-xtregs.c"

int

get_thread_id (ptid_t ptid)

{

  int tid = TIDGET (ptid);

  if (0 == tid)

    tid = PIDGET (ptid);

  return tid;

}

#define GET_THREAD_ID(PTID)     get_thread_id (PTID)

void

fill_gregset (const struct regcache *regcache,

              gdb_gregset_t *gregsetp, int regnum)

{

  int i;

  xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;

  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)

    regcache_raw_collect (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);

  if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)

    regcache_raw_collect (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);

  if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)

    regcache_raw_collect (regcache,

                          gdbarch_tdep (gdbarch)->wb_regnum,

                          &regs->windowbase);

  if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)

    regcache_raw_collect (regcache,

                          gdbarch_tdep (gdbarch)->ws_regnum,

                          &regs->windowstart);

  if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)

    regcache_raw_collect (regcache,

                          gdbarch_tdep (gdbarch)->lbeg_regnum,

                          &regs->lbeg);

  if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)

    regcache_raw_collect (regcache,

                          gdbarch_tdep (gdbarch)->lend_regnum,

                          &regs->lend);

  if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)

    regcache_raw_collect (regcache,

                          gdbarch_tdep (gdbarch)->lcount_regnum,

                          &regs->lcount);

  if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)

    regcache_raw_collect (regcache,

                          gdbarch_tdep (gdbarch)->sar_regnum,

                          &regs->sar);

  if (regnum >=gdbarch_tdep (gdbarch)->ar_base

      && regnum < gdbarch_tdep (gdbarch)->ar_base

                    + gdbarch_tdep (gdbarch)->num_aregs)

    regcache_raw_collect (regcache,regnum,

                          &regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);

  else if (regnum == -1)

    {

      for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)

        regcache_raw_collect (regcache,

                              gdbarch_tdep (gdbarch)->ar_base + i,

                              &regs->ar[i]);

    }

}

void

supply_gregset_reg (struct regcache *regcache,

                    const gdb_gregset_t *gregsetp, int regnum)

{

  int i;

  xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;

  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)

    regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), &regs->pc);

  if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)

    regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch), &regs->ps);

  if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)

    regcache_raw_supply (regcache,

                          gdbarch_tdep (gdbarch)->wb_regnum,

                          &regs->windowbase);

  if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)

    regcache_raw_supply (regcache,

                          gdbarch_tdep (gdbarch)->ws_regnum,

                          &regs->windowstart);

  if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)

    regcache_raw_supply (regcache,

                          gdbarch_tdep (gdbarch)->lbeg_regnum,

                          &regs->lbeg);

  if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)

    regcache_raw_supply (regcache,

                          gdbarch_tdep (gdbarch)->lend_regnum,

                          &regs->lend);

  if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)

    regcache_raw_supply (regcache,

                          gdbarch_tdep (gdbarch)->lcount_regnum,

                          &regs->lcount);

  if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)

    regcache_raw_supply (regcache,

                          gdbarch_tdep (gdbarch)->sar_regnum,

                          &regs->sar);

  if (regnum >=gdbarch_tdep (gdbarch)->ar_base

      && regnum < gdbarch_tdep (gdbarch)->ar_base

                    + gdbarch_tdep (gdbarch)->num_aregs)

    regcache_raw_supply (regcache,regnum,

                          &regs->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);

  else if (regnum == -1)

    {

      for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)

        regcache_raw_supply (regcache,

                              gdbarch_tdep (gdbarch)->ar_base + i,

                              &regs->ar[i]);

    }

}

void

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

{

  supply_gregset_reg (regcache, gregsetp, -1);

}

void

fill_fpregset (const struct regcache *regcache,

               gdb_fpregset_t *fpregsetp, int regnum)

{

  return;

}

void

supply_fpregset (struct regcache *regcache,

                 const gdb_fpregset_t *fpregsetp)

{

  return;

}

/* Fetch greg-register(s) from process/thread TID

   and store value(s) in GDB's register array.  */

static void

fetch_gregs (struct regcache *regcache, int regnum)

{

  int tid = GET_THREAD_ID (inferior_ptid);

  const gdb_gregset_t regs;

  int areg;

  if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)

    {

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

      return;

    }

  supply_gregset_reg (regcache, &regs, regnum);

}

/* Store greg-register(s) in GDB's register

   array into the process/thread specified by TID.  */

static void

store_gregs (struct regcache *regcache, int regnum)

{

  int tid = GET_THREAD_ID (inferior_ptid);

  gdb_gregset_t regs;

  int areg;

  if (ptrace (PTRACE_GETREGS, tid, 0, (long) &regs) < 0)

    {

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

      return;

    }

  fill_gregset (regcache, &regs, regnum);

  if (ptrace (PTRACE_SETREGS, tid, 0, (long) &regs) < 0)

    {

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

      return;

    }

}

static int xtreg_lo;

static int xtreg_high;

/* Fetch/Store Xtensa TIE registers.  Xtensa GNU/Linux PTRACE

   interface provides special requests for this.  */

static void

fetch_xtregs (struct regcache *regcache, int regnum)

{

  int tid = GET_THREAD_ID (inferior_ptid);

  const xtensa_regtable_t *ptr;

  char xtregs [XTENSA_ELF_XTREG_SIZE];

  if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)

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

  for (ptr = xtensa_regmap_table; ptr->name; ptr++)

    if (regnum == ptr->gdb_regnum || regnum == -1)

      regcache_raw_supply (regcache, ptr->gdb_regnum,

                           xtregs + ptr->ptrace_offset);

}

static void

store_xtregs (struct regcache *regcache, int regnum)

{

  int tid = GET_THREAD_ID (inferior_ptid);

  const xtensa_regtable_t *ptr;

  char xtregs [XTENSA_ELF_XTREG_SIZE];

  if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)

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

  for (ptr = xtensa_regmap_table; ptr->name; ptr++)

    if (regnum == ptr->gdb_regnum || regnum == -1)

      regcache_raw_collect (regcache, ptr->gdb_regnum,

                            xtregs + ptr->ptrace_offset);

  if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0)

    perror_with_name (_("Couldn't write extended registers"));

}

void

xtensa_linux_fetch_inferior_registers (struct regcache *regcache, int regnum)

{

  if (regnum == -1)

    {

      fetch_gregs (regcache, regnum);

      fetch_xtregs (regcache, regnum);

    }

  else if ((regnum < xtreg_lo) || (regnum > xtreg_high))

    fetch_gregs (regcache, regnum);

  else

    fetch_xtregs (regcache, regnum);

}

void

xtensa_linux_store_inferior_registers (struct regcache *regcache, int regnum)

{

  if (regnum == -1)

    {

      store_gregs (regcache, regnum);

      store_xtregs (regcache, regnum);

    }

  else if ((regnum < xtreg_lo) || (regnum > xtreg_high))

    store_gregs (regcache, regnum);

  else

    store_xtregs (regcache, regnum);

}

void _initialize_xtensa_linux_nat (void);

void

_initialize_xtensa_linux_nat (void)

{

  struct target_ops *t;

  const xtensa_regtable_t *ptr;

  /* Calculate the number range for extended registers.  */

  xtreg_lo = 1000000000;

  xtreg_high = -1;

  for (ptr = xtensa_regmap_table; ptr->name; ptr++)

    {

      if (ptr->gdb_regnum < xtreg_lo)

        xtreg_lo = ptr->gdb_regnum;

      if (ptr->gdb_regnum > xtreg_high)

        xtreg_high = ptr->gdb_regnum;

    }

  /* Fill in the generic GNU/Linux methods.  */

  t = linux_target ();

  /* Add our register access methods.  */

  t->to_fetch_registers = xtensa_linux_fetch_inferior_registers;

  t->to_store_registers = xtensa_linux_store_inferior_registers;

  linux_nat_add_target (t);

}