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/* Target-dependent code for the IA-64 for GDB, the GNU debugger.

   Copyright 2000

   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 "defs.h"

#include "arch-utils.h"

/* The sigtramp code is in a non-readable (executable-only) region

   of memory called the ``gate page''.  The addresses in question

   were determined by examining the system headers.  They are

   overly generous to allow for different pages sizes. */

#define GATE_AREA_START 0xa000000000000100LL

#define GATE_AREA_END   0xa000000000010000LL

/* Offset to sigcontext structure from frame of handler */

#define IA64_LINUX_SIGCONTEXT_OFFSET 192

int

ia64_linux_in_sigtramp (CORE_ADDR pc, char *func_name)

{

  return (pc >= (CORE_ADDR) GATE_AREA_START && pc < (CORE_ADDR) GATE_AREA_END);

}

/* IA-64 GNU/Linux specific function which, given a frame address and

   a register number, returns the address at which that register may be

   found.  0 is returned for registers which aren't stored in the the

   sigcontext structure. */

CORE_ADDR

ia64_linux_sigcontext_register_address (CORE_ADDR sp, int regno)

{

  if (IA64_GR0_REGNUM <= regno && regno <= IA64_GR31_REGNUM)

    return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 200 + 8 * (regno - IA64_GR0_REGNUM);

  else if (IA64_BR0_REGNUM <= regno && regno <= IA64_BR7_REGNUM)

    return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 136 + 8 * (regno - IA64_BR0_REGNUM);

  else if (IA64_FR0_REGNUM <= regno && regno <= IA64_FR127_REGNUM)

    return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 464 + 16 * (regno - IA64_FR0_REGNUM);

  else

    switch (regno)

      {

      case IA64_IP_REGNUM :

        return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 40;

      case IA64_CFM_REGNUM :

        return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 48;

      case IA64_PSR_REGNUM :

        return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 56;          /* user mask only */

      /* sc_ar_rsc is provided, from which we could compute bspstore, but

         I don't think it's worth it.  Anyway, if we want it, it's at offset

         64 */

      case IA64_BSP_REGNUM :

        return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 72;

      case IA64_RNAT_REGNUM :

        return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 80;

      case IA64_CCV_REGNUM :

        return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 88;

      case IA64_UNAT_REGNUM :

        return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 96;

      case IA64_FPSR_REGNUM :

        return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 104;

      case IA64_PFS_REGNUM :

        return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 112;

      case IA64_LC_REGNUM :

        return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 120;

      case IA64_PR_REGNUM :

        return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 128;

      default :

        return 0;

      }

}