| /* |
| * Copyright (C) 2013 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /* |
| * Dwarf2 data encoding flags. |
| */ |
| |
| #define DW_EH_PE_absptr 0x00 |
| #define DW_EH_PE_omit 0xff |
| #define DW_EH_PE_uleb128 0x01 |
| #define DW_EH_PE_udata2 0x02 |
| #define DW_EH_PE_udata4 0x03 |
| #define DW_EH_PE_udata8 0x04 |
| #define DW_EH_PE_sleb128 0x09 |
| #define DW_EH_PE_sdata2 0x0A |
| #define DW_EH_PE_sdata4 0x0B |
| #define DW_EH_PE_sdata8 0x0C |
| #define DW_EH_PE_signed 0x08 |
| #define DW_EH_PE_pcrel 0x10 |
| #define DW_EH_PE_textrel 0x20 |
| #define DW_EH_PE_datarel 0x30 |
| #define DW_EH_PE_funcrel 0x40 |
| #define DW_EH_PE_aligned 0x50 |
| #define DW_EH_PE_indirect 0x80 |
| |
| /* |
| * Dwarf2 call frame instructions. |
| */ |
| |
| typedef enum { |
| DW_CFA_advance_loc = 0x40, |
| DW_CFA_offset = 0x80, |
| DW_CFA_restore = 0xc0, |
| DW_CFA_nop = 0x00, |
| DW_CFA_set_loc = 0x01, |
| DW_CFA_advance_loc1 = 0x02, |
| DW_CFA_advance_loc2 = 0x03, |
| DW_CFA_advance_loc4 = 0x04, |
| DW_CFA_offset_extended = 0x05, |
| DW_CFA_restore_extended = 0x06, |
| DW_CFA_undefined = 0x07, |
| DW_CFA_same_value = 0x08, |
| DW_CFA_register = 0x09, |
| DW_CFA_remember_state = 0x0a, |
| DW_CFA_restore_state = 0x0b, |
| DW_CFA_def_cfa = 0x0c, |
| DW_CFA_def_cfa_register = 0x0d, |
| DW_CFA_def_cfa_offset = 0x0e |
| } dwarf_CFA; |
| |
| /* |
| * eh_frame_hdr information. |
| */ |
| |
| typedef struct { |
| uint8_t version; |
| uint8_t eh_frame_ptr_enc; |
| uint8_t fde_count_enc; |
| uint8_t fde_table_enc; |
| uintptr_t eh_frame_ptr; |
| uint32_t fde_count; |
| } eh_frame_hdr_info_t; |
| |
| /* |
| * CIE information. |
| */ |
| |
| typedef struct { |
| uint8_t version; |
| uint32_t code_align; |
| uint32_t data_align; |
| uint32_t reg; |
| uint32_t aug_z; |
| uint8_t aug_L; |
| uint8_t aug_R; |
| uint8_t aug_S; |
| uint32_t aug_P; |
| } cie_info_t; |
| |
| /* |
| * FDE information. |
| */ |
| |
| typedef struct { |
| uint32_t start; |
| uint32_t length; // number of instructions covered by FDE |
| uint32_t aug_z; |
| uint32_t aug_L; |
| } fde_info_t; |
| |
| /* |
| * Dwarf state. |
| */ |
| |
| /* Stack of states: required for DW_CFA_remember_state/DW_CFA_restore_state |
| 30 should be enough */ |
| #define DWARF_STATES_STACK 30 |
| |
| typedef struct { |
| char rule; // rule: o - offset(value); r - register(value) |
| uint32_t value; // value |
| } reg_rule_t; |
| |
| /* Dwarf preserved number of registers for mips */ |
| typedef enum |
| { |
| UNW_MIPS_R0, |
| UNW_MIPS_R1, |
| UNW_MIPS_R2, |
| UNW_MIPS_R3, |
| UNW_MIPS_R4, |
| UNW_MIPS_R5, |
| UNW_MIPS_R6, |
| UNW_MIPS_R7, |
| UNW_MIPS_R8, |
| UNW_MIPS_R9, |
| UNW_MIPS_R10, |
| UNW_MIPS_R11, |
| UNW_MIPS_R12, |
| UNW_MIPS_R13, |
| UNW_MIPS_R14, |
| UNW_MIPS_R15, |
| UNW_MIPS_R16, |
| UNW_MIPS_R17, |
| UNW_MIPS_R18, |
| UNW_MIPS_R19, |
| UNW_MIPS_R20, |
| UNW_MIPS_R21, |
| UNW_MIPS_R22, |
| UNW_MIPS_R23, |
| UNW_MIPS_R24, |
| UNW_MIPS_R25, |
| UNW_MIPS_R26, |
| UNW_MIPS_R27, |
| UNW_MIPS_R28, |
| UNW_MIPS_R29, |
| UNW_MIPS_R30, |
| UNW_MIPS_R31, |
| |
| UNW_MIPS_PC = 34, |
| |
| /* FIXME: Other registers! */ |
| |
| /* For MIPS, the CFA is the value of SP (r29) at the call site in the |
| previous frame. */ |
| UNW_MIPS_CFA, |
| |
| UNW_TDEP_LASTREG, |
| |
| UNW_TDEP_LAST_REG = UNW_MIPS_R31, |
| |
| UNW_TDEP_IP = UNW_MIPS_R31, |
| UNW_TDEP_SP = UNW_MIPS_R29, |
| UNW_TDEP_EH = UNW_MIPS_R0 /* FIXME. */ |
| |
| } |
| mips_regnum_t; |
| |
| #define DWARF_REGISTERS UNW_TDEP_LASTREG |
| |
| typedef struct { |
| uintptr_t loc; // location (ip) |
| uint8_t cfa_reg; // index of register where CFA location stored |
| intptr_t cfa_off; // offset |
| reg_rule_t regs[DWARF_REGISTERS]; // dwarf preserved registers for mips |
| } dwarf_state_t; |
| |
| /* DWARF registers we are caring about. */ |
| |
| |
| #define DWARF_SP UNW_MIPS_R29 |
| #define DWARF_RA UNW_MIPS_R31 |
| #define DWARF_PC UNW_MIPS_PC |
| #define DWARF_FP UNW_MIPS_CFA /* FIXME is this correct? */ |