/* Mach-O compact unwind encoding. Copyright (C) 2014-2015 Free Software Foundation, Inc. This file is part of BFD, the Binary File Descriptor library. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #ifndef _MACH_O_UNWIND_H #define _MACH_O_UNWIND_H /* Encodings bits for all cpus. */ #define MACH_O_UNWIND_IS_NOT_FUNCTION_START 0x80000000 #define MACH_O_UNWIND_HAS_LSDA 0x40000000 #define MACH_O_UNWIND_PERSONALITY_MASK 0x30000000 #define MACH_O_UNWIND_PERSONALITY_SHIFT 28 /* Encodings for x86-64. */ /* Kind of encoding (4 bits). */ #define MACH_O_UNWIND_X86_64_MODE_MASK 0x0f000000 /* Frame is RBP based, using the standard sequence: push %rbp; mov %rsp, %rbp. Non-volatile registers must be saved in the stack starting at %rbp-8 to %rbp-2040 (offset is encoded in offset bits * 8). Registers saved are encoded in registers bits, 3 bits per register. */ #define MACH_O_UNWIND_X86_64_MODE_RBP_FRAME 0x01000000 #define MACH_O_UNWIND_X86_64_RBP_FRAME_REGSITERS 0x00007FFF #define MACH_O_UNWIND_X86_64_RBP_FRAME_OFFSET 0x00FF0000 /* Frameless function, with a small stack size. */ #define MACH_O_UNWIND_X86_64_MODE_STACK_IMMD 0x02000000 #define MACH_O_UNWIND_X86_64_FRAMELESS_STACK_SIZE 0x00FF0000 #define MACH_O_UNWIND_X86_64_FRAMELESS_REG_COUNT 0x00001C00 #define MACH_O_UNWIND_X86_64_FRAMELESS_REG_PERMUTATION 0x000003FF /* Frameless function, with a larger stack size. The stack size is the sum of the X in subq $X,%rsp (address of X is at function + stack size bits) and stack adjust. */ #define MACH_O_UNWIND_X86_64_MODE_STACK_IND 0x03000000 #define MACH_O_UNWIND_X86_64_FRAMELESS_STACK_ADJUST 0x0000E000 /* Use dwarf. */ #define MACH_O_UNWIND_X86_64_MODE_DWARF 0x04000000 #define MACH_O_UNWIND_X86_64_DWARF_SECTION_OFFSET 0x00ffffff /* Registers. */ #define MACH_O_UNWIND_X86_64_REG_NONE 0 #define MACH_O_UNWIND_X86_64_REG_RBX 1 #define MACH_O_UNWIND_X86_64_REG_R12 2 #define MACH_O_UNWIND_X86_64_REG_R13 3 #define MACH_O_UNWIND_X86_64_REG_R14 4 #define MACH_O_UNWIND_X86_64_REG_R15 5 #define MACH_O_UNWIND_X86_64_REG_RBP 6 /* Encodings for x86 (almot the same as x86-64). */ /* Kind of encoding (4 bits). */ #define MACH_O_UNWIND_X86_MODE_MASK 0x0f000000 /* Frame is EBP based, using the standard sequence: push %ebp; mov %esp, %ebp. Non-volatile registers must be saved in the stack starting at %ebp-4 to %ebp-240 (offset is encoded in offset bits * 4). Registers saved are encoded in registers bits, 3 bits per register. */ #define MACH_O_UNWIND_X86_MODE_EBP_FRAME 0x01000000 #define MACH_O_UNWIND_X86_EBP_FRAME_REGSITERS 0x00007FFF #define MACH_O_UNWIND_X86_EBP_FRAME_OFFSET 0x00FF0000 /* Frameless function, with a small stack size. */ #define MACH_O_UNWIND_X86_MODE_STACK_IMMD 0x02000000 #define MACH_O_UNWIND_X86_FRAMELESS_STACK_SIZE 0x00FF0000 #define MACH_O_UNWIND_X86_FRAMELESS_REG_COUNT 0x00001C00 #define MACH_O_UNWIND_X86_FRAMELESS_REG_PERMUTATION 0x000003FF /* Frameless function, with a larger stack size. The stack size is the sum of the X in subq $X,%esp (address of X is at function + stack size bits) and stack adjust. */ #define MACH_O_UNWIND_X86_MODE_STACK_IND 0x03000000 #define MACH_O_UNWIND_X86_FRAMELESS_STACK_ADJUST 0x0000E000 /* Use dwarf. */ #define MACH_O_UNWIND_X86_MODE_DWARF 0x04000000 #define MACH_O_UNWIND_X86_DWARF_SECTION_OFFSET 0x00ffffff /* Registers. */ #define MACH_O_UNWIND_X86_REG_NONE 0 #define MACH_O_UNWIND_X86_REG_EBX 1 #define MACH_O_UNWIND_X86_REG_ECX 2 #define MACH_O_UNWIND_X86_REG_EDX 3 #define MACH_O_UNWIND_X86_REG_EDI 4 #define MACH_O_UNWIND_X86_REG_ESI 5 #define MACH_O_UNWIND_X86_REG_EBP 6 /* Encodings for arm64. */ #define MACH_O_UNWIND_ARM64_MODE_MASK 0x0f000000 /* Leaf function: FP/LR are *not* saved, none or some non-volatile registers are saved, stack is allocated. The size of the frame (register saved and memory) is encoded in STACK_SIZE in 16 byte units. */ #define MACH_O_UNWIND_ARM64_MODE_FRAMELESS 0x02000000 #define MACH_O_UNWIND_ARM64_MODE_DWARF 0x03000000 /* Standard frame: FP/LR are pushed, SP is copied to FP, then non-volatile registers are saved. */ #define MACH_O_UNWIND_ARM64_MODE_FRAME 0x04000000 /* Registers (for FRAME). */ #define MACH_O_UNWIND_ARM64_FRAME_X19_X20_PAIR 0x00000001 #define MACH_O_UNWIND_ARM64_FRAME_X21_X22_PAIR 0x00000002 #define MACH_O_UNWIND_ARM64_FRAME_X23_X24_PAIR 0x00000004 #define MACH_O_UNWIND_ARM64_FRAME_X25_X26_PAIR 0x00000008 #define MACH_O_UNWIND_ARM64_FRAME_X27_X28_PAIR 0x00000010 #define MACH_O_UNWIND_ARM64_FRAME_D8_D9_PAIR 0x00000100 #define MACH_O_UNWIND_ARM64_FRAME_D10_D11_PAIR 0x00000200 #define MACH_O_UNWIND_ARM64_FRAME_D12_D13_PAIR 0x00000400 #define MACH_O_UNWIND_ARM64_FRAME_D14_D15_PAIR 0x00000800 #define MACH_O_UNWIND_ARM64_FRAMELESS_STACK_SIZE_MASK 0x00fff000 #define MACH_O_UNWIND_ARM64_DWARF_SECTION_OFFSET 0x00ffffff /* Entry in object file (in __LD,__compact_unwind section). */ struct mach_o_compact_unwind_32 { unsigned char start[4]; unsigned char length[4]; unsigned char encoding[4]; unsigned char personality[4]; unsigned char lsda[4]; }; struct mach_o_compact_unwind_64 { unsigned char start[8]; unsigned char length[4]; unsigned char encoding[4]; unsigned char personality[8]; unsigned char lsda[8]; }; /* Header in images (in __TEXT,__unwind_info). */ #define MACH_O_UNWIND_SECTION_VERSION 1 /* Current verion in header. */ struct mach_o_unwind_info_header { unsigned char version[4]; /* Currently MACH_O_UNWIND_SECTION_VERSION. */ unsigned char encodings_array_offset[4]; unsigned char encodings_array_count[4]; unsigned char personality_array_offset[4]; unsigned char personality_array_count[4]; unsigned char index_offset[4]; unsigned char index_count[4]; /* Followed by: - encodings array These are the encodings shared, for index < encoding_array_count - personality array count given by personality_array_count - index entries count given by index_count - lsda index entries last offset given by lsda offset of last index_entry. */ }; struct mach_o_unwind_index_entry { unsigned char function_offset[4]; unsigned char second_level_offset[4]; unsigned char lsda_index_offset[4]; }; struct mach_o_unwind_lsda_index_entry { unsigned char function_offset[4]; unsigned char lsda_offset[4]; }; /* Second level index pages. */ #define MACH_O_UNWIND_SECOND_LEVEL_REGULAR 2 struct mach_o_unwind_regular_second_level_page_header { unsigned char kind[4]; unsigned char entry_page_offset[2]; unsigned char entry_count[2]; /* Array of entries. */ }; struct mach_o_unwind_regular_second_level_entry { unsigned char function_offset[4]; unsigned char encoding[4]; }; #define MACH_O_UNWIND_SECOND_LEVEL_COMPRESSED 3 struct mach_o_unwind_compressed_second_level_page_header { unsigned char kind[4]; unsigned char entry_page_offset[2]; unsigned char entry_count[2]; unsigned char encodings_offset[2]; unsigned char encodings_count[2]; /* Followed by entries array (one word, see below). */ /* Followed by (non-common) encodings array. */ }; /* Compressed entries are one word, containing function offset and encoding index. */ #define MACH_O_UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET(en) \ ((en) & 0x00FFFFFF) #define MACH_O_UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX(en) \ (((en) >> 24) & 0xFF) #endif /* _MACH_O_UNWIND_H */