1 /* Run-time dynamic linker data structures for loaded ELF shared objects. 2 Copyright (C) 2000-2021 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library. If not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _MIPS_LDSODEFS_H 20 #define _MIPS_LDSODEFS_H 1 21 22 #include <elf.h> 23 24 struct La_mips_32_regs; 25 struct La_mips_32_retval; 26 struct La_mips_64_regs; 27 struct La_mips_64_retval; 28 29 #define ELF_MACHINE_GNU_HASH_ADDRIDX (DT_MIPS_XHASH - DT_LOPROC + DT_NUM) 30 31 /* Calculate the index of a symbol in MIPS xhash. */ 32 #define ELF_MACHINE_HASH_SYMIDX(map, hasharr) \ 33 ((map)->l_mach.mips_xlat_zero[(hasharr) - (map)->l_gnu_chain_zero]) 34 35 /* Setup MIPS xhash. */ 36 #define ELF_MACHINE_XHASH_SETUP(hash32, symbias, map) \ 37 do \ 38 { \ 39 (hash32) += (map)->l_info[DT_MIPS (SYMTABNO)]->d_un.d_val - (symbias); \ 40 (map)->l_mach.mips_xlat_zero = (hash32) - (symbias); \ 41 } \ 42 while (0) 43 44 #define ARCH_PLTENTER_MEMBERS \ 45 Elf32_Addr (*mips_o32_gnu_pltenter) (Elf32_Sym *, unsigned int, \ 46 uintptr_t *, uintptr_t *, \ 47 struct La_mips_32_regs *, \ 48 unsigned int *, const char *name, \ 49 long int *framesizep); \ 50 Elf32_Addr (*mips_n32_gnu_pltenter) (Elf32_Sym *, unsigned int, \ 51 uintptr_t *, uintptr_t *, \ 52 struct La_mips_64_regs *, \ 53 unsigned int *, const char *name, \ 54 long int *framesizep); \ 55 Elf64_Addr (*mips_n64_gnu_pltenter) (Elf64_Sym *, unsigned int, \ 56 uintptr_t *, uintptr_t *, \ 57 struct La_mips_64_regs *, \ 58 unsigned int *, const char *name, \ 59 long int *framesizep); 60 61 #define ARCH_PLTEXIT_MEMBERS \ 62 unsigned int (*mips_o32_gnu_pltexit) (Elf32_Sym *, unsigned int, \ 63 uintptr_t *, uintptr_t *, \ 64 const struct La_mips_32_regs *, \ 65 struct La_mips_32_retval *, \ 66 const char *); \ 67 unsigned int (*mips_n32_gnu_pltexit) (Elf32_Sym *, unsigned int, \ 68 uintptr_t *, uintptr_t *, \ 69 const struct La_mips_64_regs *, \ 70 struct La_mips_64_retval *, \ 71 const char *); \ 72 unsigned int (*mips_n64_gnu_pltexit) (Elf64_Sym *, unsigned int, \ 73 uintptr_t *, uintptr_t *, \ 74 const struct La_mips_64_regs *, \ 75 struct La_mips_64_retval *, \ 76 const char *); 77 78 #include_next <ldsodefs.h> 79 80 /* The 64-bit MIPS ELF ABI uses an unusual reloc format. Each 81 relocation entry specifies up to three actual relocations, all at 82 the same address. The first relocation which required a symbol 83 uses the symbol in the r_sym field. The second relocation which 84 requires a symbol uses the symbol in the r_ssym field. If all 85 three relocations require a symbol, the third one uses a zero 86 value. 87 88 We define these structures in internal headers because we're not 89 sure we want to make them part of the ABI yet. Eventually, some of 90 this may move into elf/elf.h. */ 91 92 /* An entry in a 64 bit SHT_REL section. */ 93 94 typedef struct 95 { 96 Elf32_Word r_sym; /* Symbol index */ 97 unsigned char r_ssym; /* Special symbol for 2nd relocation */ 98 unsigned char r_type3; /* 3rd relocation type */ 99 unsigned char r_type2; /* 2nd relocation type */ 100 unsigned char r_type1; /* 1st relocation type */ 101 } _Elf64_Mips_R_Info; 102 103 typedef union 104 { 105 Elf64_Xword r_info_number; 106 _Elf64_Mips_R_Info r_info_fields; 107 } _Elf64_Mips_R_Info_union; 108 109 typedef struct 110 { 111 Elf64_Addr r_offset; /* Address */ 112 _Elf64_Mips_R_Info_union r_info; /* Relocation type and symbol index */ 113 } Elf64_Mips_Rel; 114 115 typedef struct 116 { 117 Elf64_Addr r_offset; /* Address */ 118 _Elf64_Mips_R_Info_union r_info; /* Relocation type and symbol index */ 119 Elf64_Sxword r_addend; /* Addend */ 120 } Elf64_Mips_Rela; 121 122 #define ELF64_MIPS_R_SYM(i) \ 123 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym) 124 #define ELF64_MIPS_R_TYPE(i) \ 125 (((_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1 \ 126 | ((Elf32_Word)(__extension__ (_Elf64_Mips_R_Info_union)(i) \ 127 ).r_info_fields.r_type2 << 8) \ 128 | ((Elf32_Word)(__extension__ (_Elf64_Mips_R_Info_union)(i) \ 129 ).r_info_fields.r_type3 << 16) \ 130 | ((Elf32_Word)(__extension__ (_Elf64_Mips_R_Info_union)(i) \ 131 ).r_info_fields.r_ssym << 24)) 132 #define ELF64_MIPS_R_INFO(sym, type) \ 133 (__extension__ (_Elf64_Mips_R_Info_union) \ 134 (__extension__ (_Elf64_Mips_R_Info) \ 135 { (sym), ELF64_MIPS_R_SSYM (type), \ 136 ELF64_MIPS_R_TYPE3 (type), \ 137 ELF64_MIPS_R_TYPE2 (type), \ 138 ELF64_MIPS_R_TYPE1 (type) \ 139 }).r_info_number) 140 /* These macros decompose the value returned by ELF64_MIPS_R_TYPE, and 141 compose it back into a value that it can be used as an argument to 142 ELF64_MIPS_R_INFO. */ 143 #define ELF64_MIPS_R_SSYM(i) (((i) >> 24) & 0xff) 144 #define ELF64_MIPS_R_TYPE3(i) (((i) >> 16) & 0xff) 145 #define ELF64_MIPS_R_TYPE2(i) (((i) >> 8) & 0xff) 146 #define ELF64_MIPS_R_TYPE1(i) ((i) & 0xff) 147 #define ELF64_MIPS_R_TYPEENC(type1, type2, type3, ssym) \ 148 ((type1) \ 149 | ((Elf32_Word)(type2) << 8) \ 150 | ((Elf32_Word)(type3) << 16) \ 151 | ((Elf32_Word)(ssym) << 24)) 152 153 #undef ELF64_R_SYM 154 #define ELF64_R_SYM(i) ELF64_MIPS_R_SYM (i) 155 #undef ELF64_R_TYPE 156 #define ELF64_R_TYPE(i) ELF64_MIPS_R_TYPE (i) 157 #undef ELF64_R_INFO 158 #define ELF64_R_INFO(sym, type) ELF64_MIPS_R_INFO ((sym), (type)) 159 160 #endif 161