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 79