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/* Signal trampoline unwinder, for GDB the GNU Debugger.
Copyright 2004 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. */
#ifndef TRAMP_FRAME_H
#define TRAMP_FRAME_H
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 entire instruction sequence. 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 TRAMP[0]
contains the first instruction of the trampoline and hence the
address of the instruction matching TRAMP[0] is the trampoline's
"func" address. The instruction sequence shall be terminated by
TRAMP_SENTINEL_INSN. */
int insn_size;
ULONGEST insn[8];
/* 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
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