| 1 | /* Frame unwinder for frames with DWARF Call Frame Information. |
| 2 | |
| 3 | Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009 |
| 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 | unsigned char *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 | #endif /* dwarf2-frame.h */ |