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/* Signal trampoline unwinder.

   Copyright (C) 2004, 2005, 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/>.  */

#ifndef TRAMP_FRAME_H

#define TRAMP_FRAME_H

#include "frame.h"              /* For "enum frame_type".  */

struct trad_frame;

struct frame_info;

struct trad_frame_cache;

/* A trampoline consists of a small sequence of instructions placed at

   an unspecified location in the inferior's address space.  The only

   identifying attribute of the trampoline's address is that it does

   not fall inside an object file's section.

   The only way to identify a trampoline is to perform a brute force

   examination of the instructions at and around the PC.

   This module provides a convent interface for performing that

   operation.  */

/* A trampoline descriptor.  */

/* Magic instruction that to mark the end of the signal trampoline

   instruction sequence.  */

#define TRAMP_SENTINEL_INSN ((LONGEST) -1)

struct tramp_frame

{

  /* The trampoline's type, some a signal trampolines, some are normal

     call-frame trampolines (aka thunks).  */

  enum frame_type frame_type;

  /* The trampoline's entire instruction sequence.  It consists of a

     bytes/mask pair.  Search for this in the inferior at or around

     the frame's PC.  It is assumed that the PC is INSN_SIZE aligned,

     and that each element of TRAMP contains one INSN_SIZE

     instruction.  It is also assumed that INSN[0] contains the first

     instruction of the trampoline and hence the address of the

     instruction matching INSN[0] is the trampoline's "func" address.

     The instruction sequence is terminated by

     TRAMP_SENTINEL_INSN.  */

  int insn_size;

  struct

  {

    ULONGEST bytes;

    ULONGEST mask;

  } insn[48];

  /* Initialize a trad-frame cache corresponding to the tramp-frame.

     FUNC is the address of the instruction TRAMP[0] in memory.  */

  void (*init) (const struct tramp_frame *self,

                struct frame_info *next_frame,

                struct trad_frame_cache *this_cache,

                CORE_ADDR func);

};

void tramp_frame_prepend_unwinder (struct gdbarch *gdbarch,

                                   const struct tramp_frame *tramp);

#endif