1*e4b17023SJohn Marino /* DWARF2 frame unwind data structure. 2*e4b17023SJohn Marino Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2009 3*e4b17023SJohn Marino Free Software Foundation, Inc. 4*e4b17023SJohn Marino 5*e4b17023SJohn Marino This file is part of GCC. 6*e4b17023SJohn Marino 7*e4b17023SJohn Marino GCC is free software; you can redistribute it and/or modify it 8*e4b17023SJohn Marino under the terms of the GNU General Public License as published by 9*e4b17023SJohn Marino the Free Software Foundation; either version 3, or (at your option) 10*e4b17023SJohn Marino any later version. 11*e4b17023SJohn Marino 12*e4b17023SJohn Marino GCC is distributed in the hope that it will be useful, but WITHOUT 13*e4b17023SJohn Marino ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 14*e4b17023SJohn Marino or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 15*e4b17023SJohn Marino License for more details. 16*e4b17023SJohn Marino 17*e4b17023SJohn Marino Under Section 7 of GPL version 3, you are granted additional 18*e4b17023SJohn Marino permissions described in the GCC Runtime Library Exception, version 19*e4b17023SJohn Marino 3.1, as published by the Free Software Foundation. 20*e4b17023SJohn Marino 21*e4b17023SJohn Marino You should have received a copy of the GNU General Public License and 22*e4b17023SJohn Marino a copy of the GCC Runtime Library Exception along with this program; 23*e4b17023SJohn Marino see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24*e4b17023SJohn Marino <http://www.gnu.org/licenses/>. */ 25*e4b17023SJohn Marino 26*e4b17023SJohn Marino /* A target can override (perhaps for backward compatibility) how 27*e4b17023SJohn Marino many dwarf2 columns are unwound. */ 28*e4b17023SJohn Marino #ifndef DWARF_FRAME_REGISTERS 29*e4b17023SJohn Marino #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER 30*e4b17023SJohn Marino #endif 31*e4b17023SJohn Marino 32*e4b17023SJohn Marino /* The result of interpreting the frame unwind info for a frame. 33*e4b17023SJohn Marino This is all symbolic at this point, as none of the values can 34*e4b17023SJohn Marino be resolved until the target pc is located. */ 35*e4b17023SJohn Marino typedef struct 36*e4b17023SJohn Marino { 37*e4b17023SJohn Marino /* Each register save state can be described in terms of a CFA slot, 38*e4b17023SJohn Marino another register, or a location expression. */ 39*e4b17023SJohn Marino struct frame_state_reg_info 40*e4b17023SJohn Marino { 41*e4b17023SJohn Marino struct { 42*e4b17023SJohn Marino union { 43*e4b17023SJohn Marino _Unwind_Word reg; 44*e4b17023SJohn Marino _Unwind_Sword offset; 45*e4b17023SJohn Marino const unsigned char *exp; 46*e4b17023SJohn Marino } loc; 47*e4b17023SJohn Marino enum { 48*e4b17023SJohn Marino REG_UNSAVED, 49*e4b17023SJohn Marino REG_SAVED_OFFSET, 50*e4b17023SJohn Marino REG_SAVED_REG, 51*e4b17023SJohn Marino REG_SAVED_EXP, 52*e4b17023SJohn Marino REG_SAVED_VAL_OFFSET, 53*e4b17023SJohn Marino REG_SAVED_VAL_EXP, 54*e4b17023SJohn Marino REG_UNDEFINED 55*e4b17023SJohn Marino } how; 56*e4b17023SJohn Marino } reg[DWARF_FRAME_REGISTERS+1]; 57*e4b17023SJohn Marino 58*e4b17023SJohn Marino /* Used to implement DW_CFA_remember_state. */ 59*e4b17023SJohn Marino struct frame_state_reg_info *prev; 60*e4b17023SJohn Marino 61*e4b17023SJohn Marino /* The CFA can be described in terms of a reg+offset or a 62*e4b17023SJohn Marino location expression. */ 63*e4b17023SJohn Marino _Unwind_Sword cfa_offset; 64*e4b17023SJohn Marino _Unwind_Word cfa_reg; 65*e4b17023SJohn Marino const unsigned char *cfa_exp; 66*e4b17023SJohn Marino enum { 67*e4b17023SJohn Marino CFA_UNSET, 68*e4b17023SJohn Marino CFA_REG_OFFSET, 69*e4b17023SJohn Marino CFA_EXP 70*e4b17023SJohn Marino } cfa_how; 71*e4b17023SJohn Marino } regs; 72*e4b17023SJohn Marino 73*e4b17023SJohn Marino /* The PC described by the current frame state. */ 74*e4b17023SJohn Marino void *pc; 75*e4b17023SJohn Marino 76*e4b17023SJohn Marino /* The information we care about from the CIE/FDE. */ 77*e4b17023SJohn Marino _Unwind_Personality_Fn personality; 78*e4b17023SJohn Marino _Unwind_Sword data_align; 79*e4b17023SJohn Marino _Unwind_Word code_align; 80*e4b17023SJohn Marino _Unwind_Word retaddr_column; 81*e4b17023SJohn Marino unsigned char fde_encoding; 82*e4b17023SJohn Marino unsigned char lsda_encoding; 83*e4b17023SJohn Marino unsigned char saw_z; 84*e4b17023SJohn Marino unsigned char signal_frame; 85*e4b17023SJohn Marino void *eh_ptr; 86*e4b17023SJohn Marino } _Unwind_FrameState; 87*e4b17023SJohn Marino 88