1 /* Frame unwinder for frames with DWARF Call Frame Information. 2 3 Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010 4 Free Software Foundation, Inc. 5 6 Contributed by Mark Kettenis. 7 8 This file is part of GDB. 9 10 This program is free software; you can redistribute it and/or modify 11 it under the terms of the GNU General Public License as published by 12 the Free Software Foundation; either version 3 of the License, or 13 (at your option) any later version. 14 15 This program is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 GNU General Public License for more details. 19 20 You should have received a copy of the GNU General Public License 21 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 22 23 #ifndef DWARF2_FRAME_H 24 #define DWARF2_FRAME_H 1 25 26 struct gdbarch; 27 struct objfile; 28 struct frame_info; 29 30 /* Register rule. */ 31 32 enum dwarf2_frame_reg_rule 33 { 34 /* Make certain that 0 maps onto the correct enum value; the 35 corresponding structure is being initialized using memset zero. 36 This indicates that CFI didn't provide any information at all 37 about a register, leaving how to obtain its value totally 38 unspecified. */ 39 DWARF2_FRAME_REG_UNSPECIFIED = 0, 40 41 /* The term "undefined" comes from the DWARF2 CFI spec which this 42 code is moddeling; it indicates that the register's value is 43 "undefined". GCC uses the less formal term "unsaved". Its 44 definition is a combination of REG_UNDEFINED and REG_UNSPECIFIED. 45 The failure to differentiate the two helps explain a few problems 46 with the CFI generated by GCC. */ 47 DWARF2_FRAME_REG_UNDEFINED, 48 DWARF2_FRAME_REG_SAVED_OFFSET, 49 DWARF2_FRAME_REG_SAVED_REG, 50 DWARF2_FRAME_REG_SAVED_EXP, 51 DWARF2_FRAME_REG_SAME_VALUE, 52 53 /* These are defined in Dwarf3. */ 54 DWARF2_FRAME_REG_SAVED_VAL_OFFSET, 55 DWARF2_FRAME_REG_SAVED_VAL_EXP, 56 57 /* These aren't defined by the DWARF2 CFI specification, but are 58 used internally by GDB. */ 59 DWARF2_FRAME_REG_FN, /* Call a registered function. */ 60 DWARF2_FRAME_REG_RA, /* Return Address. */ 61 DWARF2_FRAME_REG_RA_OFFSET, /* Return Address with offset. */ 62 DWARF2_FRAME_REG_CFA, /* Call Frame Address. */ 63 DWARF2_FRAME_REG_CFA_OFFSET /* Call Frame Address with offset. */ 64 }; 65 66 /* Register state. */ 67 68 struct dwarf2_frame_state_reg 69 { 70 /* Each register save state can be described in terms of a CFA slot, 71 another register, or a location expression. */ 72 union { 73 LONGEST offset; 74 ULONGEST reg; 75 const gdb_byte *exp; 76 struct value *(*fn) (struct frame_info *this_frame, void **this_cache, 77 int regnum); 78 } loc; 79 ULONGEST exp_len; 80 enum dwarf2_frame_reg_rule how; 81 }; 82 83 /* Set the architecture-specific register state initialization 84 function for GDBARCH to INIT_REG. */ 85 86 extern void dwarf2_frame_set_init_reg (struct gdbarch *gdbarch, 87 void (*init_reg) (struct gdbarch *, int, 88 struct dwarf2_frame_state_reg *, 89 struct frame_info *)); 90 91 /* Set the architecture-specific signal trampoline recognition 92 function for GDBARCH to SIGNAL_FRAME_P. */ 93 94 extern void 95 dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch, 96 int (*signal_frame_p) (struct gdbarch *, 97 struct frame_info *)); 98 99 /* Set the architecture-specific adjustment of .eh_frame and .debug_frame 100 register numbers. */ 101 102 extern void 103 dwarf2_frame_set_adjust_regnum (struct gdbarch *gdbarch, 104 int (*adjust_regnum) (struct gdbarch *, 105 int, int)); 106 107 /* Append the DWARF-2 frame unwinders to GDBARCH's list. */ 108 109 void dwarf2_append_unwinders (struct gdbarch *gdbarch); 110 111 /* Return the frame base methods for the function that contains PC, or 112 NULL if it can't be handled by the DWARF CFI frame unwinder. */ 113 114 extern const struct frame_base * 115 dwarf2_frame_base_sniffer (struct frame_info *this_frame); 116 117 /* Register the DWARF CFI for OBJFILE. */ 118 119 void dwarf2_frame_build_info (struct objfile *objfile); 120 121 /* Compute the DWARF CFA for a frame. */ 122 123 CORE_ADDR dwarf2_frame_cfa (struct frame_info *this_frame); 124 125 #endif /* dwarf2-frame.h */ 126