| 1 | /* Signal trampoline unwinder. |
| 2 | |
| 3 | Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010, 2011 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #ifndef TRAMP_FRAME_H |
| 22 | #define TRAMP_FRAME_H |
| 23 | |
| 24 | #include "frame.h" /* For "enum frame_type". */ |
| 25 | |
| 26 | struct trad_frame; |
| 27 | struct frame_info; |
| 28 | struct trad_frame_cache; |
| 29 | |
| 30 | /* A trampoline consists of a small sequence of instructions placed at |
| 31 | an unspecified location in the inferior's address space. The only |
| 32 | identifying attribute of the trampoline's address is that it does |
| 33 | not fall inside an object file's section. |
| 34 | |
| 35 | The only way to identify a trampoline is to perform a brute force |
| 36 | examination of the instructions at and around the PC. |
| 37 | |
| 38 | This module provides a convenient interface for performing that |
| 39 | operation. */ |
| 40 | |
| 41 | /* A trampoline descriptor. */ |
| 42 | |
| 43 | /* Magic instruction that to mark the end of the signal trampoline |
| 44 | instruction sequence. */ |
| 45 | #define TRAMP_SENTINEL_INSN ((LONGEST) -1) |
| 46 | |
| 47 | struct tramp_frame |
| 48 | { |
| 49 | /* The trampoline's type, some a signal trampolines, some are normal |
| 50 | call-frame trampolines (aka thunks). */ |
| 51 | enum frame_type frame_type; |
| 52 | /* The trampoline's entire instruction sequence. It consists of a |
| 53 | bytes/mask pair. Search for this in the inferior at or around |
| 54 | the frame's PC. It is assumed that the PC is INSN_SIZE aligned, |
| 55 | and that each element of TRAMP contains one INSN_SIZE |
| 56 | instruction. It is also assumed that INSN[0] contains the first |
| 57 | instruction of the trampoline and hence the address of the |
| 58 | instruction matching INSN[0] is the trampoline's "func" address. |
| 59 | The instruction sequence is terminated by |
| 60 | TRAMP_SENTINEL_INSN. */ |
| 61 | int insn_size; |
| 62 | struct |
| 63 | { |
| 64 | ULONGEST bytes; |
| 65 | ULONGEST mask; |
| 66 | } insn[48]; |
| 67 | /* Initialize a trad-frame cache corresponding to the tramp-frame. |
| 68 | FUNC is the address of the instruction TRAMP[0] in memory. */ |
| 69 | void (*init) (const struct tramp_frame *self, |
| 70 | struct frame_info *this_frame, |
| 71 | struct trad_frame_cache *this_cache, |
| 72 | CORE_ADDR func); |
| 73 | }; |
| 74 | |
| 75 | void tramp_frame_prepend_unwinder (struct gdbarch *gdbarch, |
| 76 | const struct tramp_frame *tramp); |
| 77 | |
| 78 | #endif |