1*38fd1498Szrj /* DWARF2 frame unwind data structure. 2*38fd1498Szrj Copyright (C) 1997-2018 Free Software Foundation, Inc. 3*38fd1498Szrj 4*38fd1498Szrj This file is part of GCC. 5*38fd1498Szrj 6*38fd1498Szrj GCC is free software; you can redistribute it and/or modify it 7*38fd1498Szrj under the terms of the GNU General Public License as published by 8*38fd1498Szrj the Free Software Foundation; either version 3, or (at your option) 9*38fd1498Szrj any later version. 10*38fd1498Szrj 11*38fd1498Szrj GCC is distributed in the hope that it will be useful, but WITHOUT 12*38fd1498Szrj ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 13*38fd1498Szrj or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 14*38fd1498Szrj License for more details. 15*38fd1498Szrj 16*38fd1498Szrj Under Section 7 of GPL version 3, you are granted additional 17*38fd1498Szrj permissions described in the GCC Runtime Library Exception, version 18*38fd1498Szrj 3.1, as published by the Free Software Foundation. 19*38fd1498Szrj 20*38fd1498Szrj You should have received a copy of the GNU General Public License and 21*38fd1498Szrj a copy of the GCC Runtime Library Exception along with this program; 22*38fd1498Szrj see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23*38fd1498Szrj <http://www.gnu.org/licenses/>. */ 24*38fd1498Szrj 25*38fd1498Szrj /* The result of interpreting the frame unwind info for a frame. 26*38fd1498Szrj This is all symbolic at this point, as none of the values can 27*38fd1498Szrj be resolved until the target pc is located. */ 28*38fd1498Szrj typedef struct 29*38fd1498Szrj { 30*38fd1498Szrj /* Each register save state can be described in terms of a CFA slot, 31*38fd1498Szrj another register, or a location expression. */ 32*38fd1498Szrj struct frame_state_reg_info 33*38fd1498Szrj { 34*38fd1498Szrj struct { 35*38fd1498Szrj union { 36*38fd1498Szrj _Unwind_Word reg; 37*38fd1498Szrj _Unwind_Sword offset; 38*38fd1498Szrj const unsigned char *exp; 39*38fd1498Szrj } loc; 40*38fd1498Szrj enum { 41*38fd1498Szrj REG_UNSAVED, 42*38fd1498Szrj REG_SAVED_OFFSET, 43*38fd1498Szrj REG_SAVED_REG, 44*38fd1498Szrj REG_SAVED_EXP, 45*38fd1498Szrj REG_SAVED_VAL_OFFSET, 46*38fd1498Szrj REG_SAVED_VAL_EXP, 47*38fd1498Szrj REG_UNDEFINED 48*38fd1498Szrj } how; 49*38fd1498Szrj } reg[__LIBGCC_DWARF_FRAME_REGISTERS__+1]; 50*38fd1498Szrj 51*38fd1498Szrj /* Used to implement DW_CFA_remember_state. */ 52*38fd1498Szrj struct frame_state_reg_info *prev; 53*38fd1498Szrj 54*38fd1498Szrj /* The CFA can be described in terms of a reg+offset or a 55*38fd1498Szrj location expression. */ 56*38fd1498Szrj _Unwind_Sword cfa_offset; 57*38fd1498Szrj _Unwind_Word cfa_reg; 58*38fd1498Szrj const unsigned char *cfa_exp; 59*38fd1498Szrj enum { 60*38fd1498Szrj CFA_UNSET, 61*38fd1498Szrj CFA_REG_OFFSET, 62*38fd1498Szrj CFA_EXP 63*38fd1498Szrj } cfa_how; 64*38fd1498Szrj } regs; 65*38fd1498Szrj 66*38fd1498Szrj /* The PC described by the current frame state. */ 67*38fd1498Szrj void *pc; 68*38fd1498Szrj 69*38fd1498Szrj /* The information we care about from the CIE/FDE. */ 70*38fd1498Szrj _Unwind_Personality_Fn personality; 71*38fd1498Szrj _Unwind_Sword data_align; 72*38fd1498Szrj _Unwind_Word code_align; 73*38fd1498Szrj _Unwind_Word retaddr_column; 74*38fd1498Szrj unsigned char fde_encoding; 75*38fd1498Szrj unsigned char lsda_encoding; 76*38fd1498Szrj unsigned char saw_z; 77*38fd1498Szrj unsigned char signal_frame; 78*38fd1498Szrj void *eh_ptr; 79*38fd1498Szrj } _Unwind_FrameState; 80*38fd1498Szrj 81