| 1 | /* Frame unwinder for frames with DWARF Call Frame Information. |
| 2 | |
| 3 | Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by Mark Kettenis. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 22 | Boston, MA 02110-1301, USA. */ |
| 23 | |
| 24 | #ifndef DWARF2_FRAME_H |
| 25 | #define DWARF2_FRAME_H 1 |
| 26 | |
| 27 | struct gdbarch; |
| 28 | struct objfile; |
| 29 | struct frame_info; |
| 30 | |
| 31 | /* Register rule. */ |
| 32 | |
| 33 | enum dwarf2_frame_reg_rule |
| 34 | { |
| 35 | /* Make certain that 0 maps onto the correct enum value; the |
| 36 | corresponding structure is being initialized using memset zero. |
| 37 | This indicates that CFI didn't provide any information at all |
| 38 | about a register, leaving how to obtain its value totally |
| 39 | unspecified. */ |
| 40 | DWARF2_FRAME_REG_UNSPECIFIED = 0, |
| 41 | |
| 42 | /* The term "undefined" comes from the DWARF2 CFI spec which this |
| 43 | code is moddeling; it indicates that the register's value is |
| 44 | "undefined". GCC uses the less formal term "unsaved". Its |
| 45 | definition is a combination of REG_UNDEFINED and REG_UNSPECIFIED. |
| 46 | The failure to differentiate the two helps explain a few problems |
| 47 | with the CFI generated by GCC. */ |
| 48 | DWARF2_FRAME_REG_UNDEFINED, |
| 49 | DWARF2_FRAME_REG_SAVED_OFFSET, |
| 50 | DWARF2_FRAME_REG_SAVED_REG, |
| 51 | DWARF2_FRAME_REG_SAVED_EXP, |
| 52 | DWARF2_FRAME_REG_SAME_VALUE, |
| 53 | |
| 54 | /* These aren't defined by the DWARF2 CFI specification, but are |
| 55 | used internally by GDB. */ |
| 56 | DWARF2_FRAME_REG_RA, /* Return Address. */ |
| 57 | DWARF2_FRAME_REG_RA_OFFSET, /* Return Address with offset. */ |
| 58 | DWARF2_FRAME_REG_CFA, /* Call Frame Address. */ |
| 59 | DWARF2_FRAME_REG_CFA_OFFSET /* Call Frame Address with offset. */ |
| 60 | }; |
| 61 | |
| 62 | /* Register state. */ |
| 63 | |
| 64 | struct dwarf2_frame_state_reg |
| 65 | { |
| 66 | /* Each register save state can be described in terms of a CFA slot, |
| 67 | another register, or a location expression. */ |
| 68 | union { |
| 69 | LONGEST offset; |
| 70 | ULONGEST reg; |
| 71 | unsigned char *exp; |
| 72 | } loc; |
| 73 | ULONGEST exp_len; |
| 74 | enum dwarf2_frame_reg_rule how; |
| 75 | }; |
| 76 | |
| 77 | /* Set the architecture-specific register state initialization |
| 78 | function for GDBARCH to INIT_REG. */ |
| 79 | |
| 80 | extern void dwarf2_frame_set_init_reg (struct gdbarch *gdbarch, |
| 81 | void (*init_reg) (struct gdbarch *, int, |
| 82 | struct dwarf2_frame_state_reg *)); |
| 83 | |
| 84 | /* Set the architecture-specific signal trampoline recognition |
| 85 | function for GDBARCH to SIGNAL_FRAME_P. */ |
| 86 | |
| 87 | extern void |
| 88 | dwarf2_frame_set_signal_frame_p (struct gdbarch *gdbarch, |
| 89 | int (*signal_frame_p) (struct gdbarch *, |
| 90 | struct frame_info *)); |
| 91 | |
| 92 | /* Return the frame unwind methods for the function that contains PC, |
| 93 | or NULL if it can't be handled by DWARF CFI frame unwinder. */ |
| 94 | |
| 95 | extern const struct frame_unwind * |
| 96 | dwarf2_frame_sniffer (struct frame_info *next_frame); |
| 97 | |
| 98 | /* Return the frame base methods for the function that contains PC, or |
| 99 | NULL if it can't be handled by the DWARF CFI frame unwinder. */ |
| 100 | |
| 101 | extern const struct frame_base * |
| 102 | dwarf2_frame_base_sniffer (struct frame_info *next_frame); |
| 103 | |
| 104 | /* Register the DWARF CFI for OBJFILE. */ |
| 105 | |
| 106 | void dwarf2_frame_build_info (struct objfile *objfile); |
| 107 | |
| 108 | #endif /* dwarf2-frame.h */ |