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| 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 |
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