1 /* Run-time dynamic linker data structures for loaded ELF shared objects. 2 Copyright (C) 2000-2022 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 /* Translate a processor specific dynamic tag to the index 30 in l_info array. */ 31 #define DT_MIPS(x) (DT_MIPS_##x - DT_LOPROC + DT_NUM) 32 33 #define ELF_MACHINE_GNU_HASH_ADDRIDX (DT_MIPS_XHASH - DT_LOPROC + DT_NUM) 34 35 /* Calculate the index of a symbol in MIPS xhash. */ 36 #define ELF_MACHINE_HASH_SYMIDX(map, hasharr) \ 37 ((map)->l_mach.mips_xlat_zero[(hasharr) - (map)->l_gnu_chain_zero]) 38 39 /* Setup MIPS xhash. */ 40 #define ELF_MACHINE_XHASH_SETUP(hash32, symbias, map) \ 41 do \ 42 { \ 43 (hash32) += (map)->l_info[DT_MIPS (SYMTABNO)]->d_un.d_val - (symbias); \ 44 (map)->l_mach.mips_xlat_zero = (hash32) - (symbias); \ 45 } \ 46 while (0) 47 48 #define ARCH_PLTENTER_MEMBERS \ 49 Elf32_Addr (*mips_o32_gnu_pltenter) (Elf32_Sym *, unsigned int, \ 50 uintptr_t *, uintptr_t *, \ 51 struct La_mips_32_regs *, \ 52 unsigned int *, const char *name, \ 53 long int *framesizep); \ 54 Elf32_Addr (*mips_n32_gnu_pltenter) (Elf32_Sym *, unsigned int, \ 55 uintptr_t *, uintptr_t *, \ 56 struct La_mips_64_regs *, \ 57 unsigned int *, const char *name, \ 58 long int *framesizep); \ 59 Elf64_Addr (*mips_n64_gnu_pltenter) (Elf64_Sym *, unsigned int, \ 60 uintptr_t *, uintptr_t *, \ 61 struct La_mips_64_regs *, \ 62 unsigned int *, const char *name, \ 63 long int *framesizep); 64 65 #define ARCH_PLTEXIT_MEMBERS \ 66 unsigned int (*mips_o32_gnu_pltexit) (Elf32_Sym *, unsigned int, \ 67 uintptr_t *, uintptr_t *, \ 68 const struct La_mips_32_regs *, \ 69 struct La_mips_32_retval *, \ 70 const char *); \ 71 unsigned int (*mips_n32_gnu_pltexit) (Elf32_Sym *, unsigned int, \ 72 uintptr_t *, uintptr_t *, \ 73 const struct La_mips_64_regs *, \ 74 struct La_mips_64_retval *, \ 75 const char *); \ 76 unsigned int (*mips_n64_gnu_pltexit) (Elf64_Sym *, unsigned int, \ 77 uintptr_t *, uintptr_t *, \ 78 const struct La_mips_64_regs *, \ 79 struct La_mips_64_retval *, \ 80 const char *); 81 82 #include_next <ldsodefs.h> 83 84 /* The 64-bit MIPS ELF ABI uses an unusual reloc format. Each 85 relocation entry specifies up to three actual relocations, all at 86 the same address. The first relocation which required a symbol 87 uses the symbol in the r_sym field. The second relocation which 88 requires a symbol uses the symbol in the r_ssym field. If all 89 three relocations require a symbol, the third one uses a zero 90 value. 91 92 We define these structures in internal headers because we're not 93 sure we want to make them part of the ABI yet. Eventually, some of 94 this may move into elf/elf.h. */ 95 96 /* An entry in a 64 bit SHT_REL section. */ 97 98 typedef struct 99 { 100 Elf32_Word r_sym; /* Symbol index */ 101 unsigned char r_ssym; /* Special symbol for 2nd relocation */ 102 unsigned char r_type3; /* 3rd relocation type */ 103 unsigned char r_type2; /* 2nd relocation type */ 104 unsigned char r_type1; /* 1st relocation type */ 105 } _Elf64_Mips_R_Info; 106 107 typedef union 108 { 109 Elf64_Xword r_info_number; 110 _Elf64_Mips_R_Info r_info_fields; 111 } _Elf64_Mips_R_Info_union; 112 113 typedef struct 114 { 115 Elf64_Addr r_offset; /* Address */ 116 _Elf64_Mips_R_Info_union r_info; /* Relocation type and symbol index */ 117 } Elf64_Mips_Rel; 118 119 typedef struct 120 { 121 Elf64_Addr r_offset; /* Address */ 122 _Elf64_Mips_R_Info_union r_info; /* Relocation type and symbol index */ 123 Elf64_Sxword r_addend; /* Addend */ 124 } Elf64_Mips_Rela; 125 126 #define ELF64_MIPS_R_SYM(i) \ 127 ((__extension__ (_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_sym) 128 #define ELF64_MIPS_R_TYPE(i) \ 129 (((_Elf64_Mips_R_Info_union)(i)).r_info_fields.r_type1 \ 130 | ((Elf32_Word)(__extension__ (_Elf64_Mips_R_Info_union)(i) \ 131 ).r_info_fields.r_type2 << 8) \ 132 | ((Elf32_Word)(__extension__ (_Elf64_Mips_R_Info_union)(i) \ 133 ).r_info_fields.r_type3 << 16) \ 134 | ((Elf32_Word)(__extension__ (_Elf64_Mips_R_Info_union)(i) \ 135 ).r_info_fields.r_ssym << 24)) 136 #define ELF64_MIPS_R_INFO(sym, type) \ 137 (__extension__ (_Elf64_Mips_R_Info_union) \ 138 (__extension__ (_Elf64_Mips_R_Info) \ 139 { (sym), ELF64_MIPS_R_SSYM (type), \ 140 ELF64_MIPS_R_TYPE3 (type), \ 141 ELF64_MIPS_R_TYPE2 (type), \ 142 ELF64_MIPS_R_TYPE1 (type) \ 143 }).r_info_number) 144 /* These macros decompose the value returned by ELF64_MIPS_R_TYPE, and 145 compose it back into a value that it can be used as an argument to 146 ELF64_MIPS_R_INFO. */ 147 #define ELF64_MIPS_R_SSYM(i) (((i) >> 24) & 0xff) 148 #define ELF64_MIPS_R_TYPE3(i) (((i) >> 16) & 0xff) 149 #define ELF64_MIPS_R_TYPE2(i) (((i) >> 8) & 0xff) 150 #define ELF64_MIPS_R_TYPE1(i) ((i) & 0xff) 151 #define ELF64_MIPS_R_TYPEENC(type1, type2, type3, ssym) \ 152 ((type1) \ 153 | ((Elf32_Word)(type2) << 8) \ 154 | ((Elf32_Word)(type3) << 16) \ 155 | ((Elf32_Word)(ssym) << 24)) 156 157 #undef ELF64_R_SYM 158 #define ELF64_R_SYM(i) ELF64_MIPS_R_SYM (i) 159 #undef ELF64_R_TYPE 160 #define ELF64_R_TYPE(i) ELF64_MIPS_R_TYPE (i) 161 #undef ELF64_R_INFO 162 #define ELF64_R_INFO(sym, type) ELF64_MIPS_R_INFO ((sym), (type)) 163 164 #endif 165