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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [tramp-frame.h] - Blame information for rev 157

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1 24 jeremybenn
/* Signal trampoline unwinder.
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   Copyright (C) 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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#ifndef TRAMP_FRAME_H
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#define TRAMP_FRAME_H
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#include "frame.h"              /* For "enum frame_type".  */
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struct trad_frame;
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struct frame_info;
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struct trad_frame_cache;
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/* A trampoline consists of a small sequence of instructions placed at
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   an unspecified location in the inferior's address space.  The only
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   identifying attribute of the trampoline's address is that it does
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   not fall inside an object file's section.
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   The only way to identify a trampoline is to perform a brute force
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   examination of the instructions at and around the PC.
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   This module provides a convent interface for performing that
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   operation.  */
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/* A trampoline descriptor.  */
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/* Magic instruction that to mark the end of the signal trampoline
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   instruction sequence.  */
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#define TRAMP_SENTINEL_INSN ((LONGEST) -1)
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struct tramp_frame
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{
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  /* The trampoline's type, some a signal trampolines, some are normal
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     call-frame trampolines (aka thunks).  */
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  enum frame_type frame_type;
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  /* The trampoline's entire instruction sequence.  It consists of a
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     bytes/mask pair.  Search for this in the inferior at or around
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     the frame's PC.  It is assumed that the PC is INSN_SIZE aligned,
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     and that each element of TRAMP contains one INSN_SIZE
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     instruction.  It is also assumed that INSN[0] contains the first
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     instruction of the trampoline and hence the address of the
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     instruction matching INSN[0] is the trampoline's "func" address.
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     The instruction sequence is terminated by
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     TRAMP_SENTINEL_INSN.  */
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  int insn_size;
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  struct
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  {
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    ULONGEST bytes;
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    ULONGEST mask;
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  } insn[48];
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  /* Initialize a trad-frame cache corresponding to the tramp-frame.
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     FUNC is the address of the instruction TRAMP[0] in memory.  */
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  void (*init) (const struct tramp_frame *self,
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                struct frame_info *next_frame,
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                struct trad_frame_cache *this_cache,
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                CORE_ADDR func);
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};
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void tramp_frame_prepend_unwinder (struct gdbarch *gdbarch,
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                                   const struct tramp_frame *tramp);
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#endif

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