| Pavel Chupin | af2cb36 | 2013-03-08 13:17:35 +0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | /* |
| 18 | * Dwarf2 data encoding flags. |
| 19 | */ |
| 20 | |
| 21 | #define DW_EH_PE_absptr 0x00 |
| 22 | #define DW_EH_PE_omit 0xff |
| 23 | #define DW_EH_PE_uleb128 0x01 |
| 24 | #define DW_EH_PE_udata2 0x02 |
| 25 | #define DW_EH_PE_udata4 0x03 |
| 26 | #define DW_EH_PE_udata8 0x04 |
| 27 | #define DW_EH_PE_sleb128 0x09 |
| 28 | #define DW_EH_PE_sdata2 0x0A |
| 29 | #define DW_EH_PE_sdata4 0x0B |
| 30 | #define DW_EH_PE_sdata8 0x0C |
| 31 | #define DW_EH_PE_signed 0x08 |
| 32 | #define DW_EH_PE_pcrel 0x10 |
| 33 | #define DW_EH_PE_textrel 0x20 |
| 34 | #define DW_EH_PE_datarel 0x30 |
| 35 | #define DW_EH_PE_funcrel 0x40 |
| 36 | #define DW_EH_PE_aligned 0x50 |
| 37 | #define DW_EH_PE_indirect 0x80 |
| 38 | |
| 39 | /* |
| 40 | * Dwarf2 call frame instructions. |
| 41 | */ |
| 42 | |
| 43 | typedef enum { |
| 44 | DW_CFA_advance_loc = 0x40, |
| 45 | DW_CFA_offset = 0x80, |
| 46 | DW_CFA_restore = 0xc0, |
| 47 | DW_CFA_nop = 0x00, |
| 48 | DW_CFA_set_loc = 0x01, |
| 49 | DW_CFA_advance_loc1 = 0x02, |
| 50 | DW_CFA_advance_loc2 = 0x03, |
| 51 | DW_CFA_advance_loc4 = 0x04, |
| 52 | DW_CFA_offset_extended = 0x05, |
| 53 | DW_CFA_restore_extended = 0x06, |
| 54 | DW_CFA_undefined = 0x07, |
| 55 | DW_CFA_same_value = 0x08, |
| 56 | DW_CFA_register = 0x09, |
| 57 | DW_CFA_remember_state = 0x0a, |
| 58 | DW_CFA_restore_state = 0x0b, |
| 59 | DW_CFA_def_cfa = 0x0c, |
| 60 | DW_CFA_def_cfa_register = 0x0d, |
| 61 | DW_CFA_def_cfa_offset = 0x0e |
| 62 | } dwarf_CFA; |
| 63 | |
| 64 | /* |
| 65 | * eh_frame_hdr information. |
| 66 | */ |
| 67 | |
| 68 | typedef struct { |
| 69 | uint8_t version; |
| 70 | uint8_t eh_frame_ptr_enc; |
| 71 | uint8_t fde_count_enc; |
| 72 | uint8_t fde_table_enc; |
| 73 | uintptr_t eh_frame_ptr; |
| 74 | uint32_t fde_count; |
| 75 | } eh_frame_hdr_info_t; |
| 76 | |
| 77 | /* |
| 78 | * CIE information. |
| 79 | */ |
| 80 | |
| 81 | typedef struct { |
| 82 | uint8_t version; |
| 83 | uint32_t code_align; |
| 84 | uint32_t data_align; |
| 85 | uint32_t reg; |
| 86 | uint32_t aug_z; |
| 87 | uint8_t aug_L; |
| 88 | uint8_t aug_R; |
| 89 | uint8_t aug_S; |
| 90 | uint32_t aug_P; |
| 91 | } cie_info_t; |
| 92 | |
| 93 | /* |
| 94 | * FDE information. |
| 95 | */ |
| 96 | |
| 97 | typedef struct { |
| 98 | uint32_t start; |
| 99 | uint32_t length; // number of instructions covered by FDE |
| 100 | uint32_t aug_z; |
| 101 | uint32_t aug_L; |
| 102 | } fde_info_t; |
| 103 | |
| 104 | /* |
| 105 | * Dwarf state. |
| 106 | */ |
| 107 | |
| 108 | /* Stack of states: required for DW_CFA_remember_state/DW_CFA_restore_state |
| 109 | 30 should be enough */ |
| 110 | #define DWARF_STATES_STACK 30 |
| 111 | |
| 112 | typedef struct { |
| 113 | char rule; // rule: o - offset(value); r - register(value) |
| 114 | uint32_t value; // value |
| 115 | } reg_rule_t; |
| 116 | |
| 117 | /* Dwarf preserved number of registers for x86. */ |
| 118 | |
| 119 | #define DWARF_REGISTERS 17 |
| 120 | |
| 121 | typedef struct { |
| 122 | uintptr_t loc; // location (ip) |
| 123 | uint8_t cfa_reg; // index of register where CFA location stored |
| 124 | intptr_t cfa_off; // offset |
| 125 | reg_rule_t regs[DWARF_REGISTERS]; // dwarf preserved registers for x86 |
| 126 | } dwarf_state_t; |
| 127 | |
| 128 | /* DWARF registers we are caring about. */ |
| 129 | |
| 130 | #define DWARF_EAX 0 |
| 131 | #define DWARF_ECX 1 |
| 132 | #define DWARF_EDX 2 |
| 133 | #define DWARF_EBX 3 |
| 134 | #define DWARF_ESP 4 |
| 135 | #define DWARF_EBP 5 |
| 136 | #define DWARF_ESI 6 |
| 137 | #define DWARF_EDI 7 |
| 138 | #define DWARF_EIP 8 |
| 139 | |
| 140 | |