| 1 | // aarch64-reloc-property.cc -- AArch64 relocation properties -*- C++ -*- |
| 2 | |
| 3 | // Copyright (C) 2014-2020 Free Software Foundation, Inc. |
| 4 | // Written by Han Shen <shenhan@google.com> and Jing Yu <jingyu@google.com>. |
| 5 | |
| 6 | // This file is part of gold. |
| 7 | |
| 8 | // This program is free software; you can redistribute it and/or modify |
| 9 | // it under the terms of the GNU General Public License as published by |
| 10 | // the Free Software Foundation; either version 3 of the License, or |
| 11 | // (at your option) any later version. |
| 12 | |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU General Public License for more details. |
| 17 | |
| 18 | // You should have received a copy of the GNU General Public License |
| 19 | // along with this program; if not, write to the Free Software |
| 20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | // MA 02110-1301, USA. |
| 22 | |
| 23 | #include "gold.h" |
| 24 | |
| 25 | #include "aarch64-reloc-property.h" |
| 26 | #include "aarch64.h" |
| 27 | |
| 28 | #include "symtab.h" |
| 29 | |
| 30 | #include<stdio.h> |
| 31 | |
| 32 | namespace gold |
| 33 | { |
| 34 | |
| 35 | template<int L, int U> |
| 36 | bool |
| 37 | rvalue_checkup(int64_t x) |
| 38 | { |
| 39 | // We save the extra_alignment_requirement bits on [31:16] of U. |
| 40 | // "extra_alignment_requirement" could be 0, 1, 3, 7 and 15. |
| 41 | unsigned short extra_alignment_requirement = (U & 0xFFFF0000) >> 16; |
| 42 | // [15:0] of U indicates the upper bound check. |
| 43 | int64_t u = U & 0x0000FFFF; |
| 44 | if (u == 0) |
| 45 | { |
| 46 | // No requirement to check overflow. |
| 47 | gold_assert(L == 0); |
| 48 | return (x & extra_alignment_requirement) == 0; |
| 49 | } |
| 50 | |
| 51 | // Check both overflow and alignment if needed. |
| 52 | int64_t low_bound = -(L == 0 ? 0 : ((int64_t)1 << L)); |
| 53 | int64_t up_bound = ((int64_t)1 << u); |
| 54 | return ((low_bound <= x && x < up_bound) |
| 55 | && ((x & extra_alignment_requirement) == 0)); |
| 56 | } |
| 57 | |
| 58 | template<> |
| 59 | bool |
| 60 | rvalue_checkup<0, 0>(int64_t) { return true; } |
| 61 | |
| 62 | namespace |
| 63 | { |
| 64 | |
| 65 | template<int L, int U> |
| 66 | class Rvalue_bit_select_impl |
| 67 | { |
| 68 | public: |
| 69 | static uint64_t |
| 70 | calc(uint64_t x) |
| 71 | { |
| 72 | return (x & ((1ULL << (U+1)) - 1)) >> L; |
| 73 | } |
| 74 | }; |
| 75 | |
| 76 | template<int L> |
| 77 | class Rvalue_bit_select_impl<L, 63> |
| 78 | { |
| 79 | public: |
| 80 | static uint64_t |
| 81 | calc(uint64_t x) |
| 82 | { |
| 83 | return x >> L; |
| 84 | } |
| 85 | }; |
| 86 | |
| 87 | // By our convention, L=U=0 means that the whole value should be retrieved. |
| 88 | template<> |
| 89 | class Rvalue_bit_select_impl<0, 0> |
| 90 | { |
| 91 | public: |
| 92 | static uint64_t |
| 93 | calc(uint64_t x) |
| 94 | { |
| 95 | return x; |
| 96 | } |
| 97 | }; |
| 98 | |
| 99 | } // End anonymous namespace. |
| 100 | |
| 101 | template<int L, int U> |
| 102 | uint64_t |
| 103 | rvalue_bit_select(uint64_t x) |
| 104 | { |
| 105 | return Rvalue_bit_select_impl<L, U>::calc(x); |
| 106 | } |
| 107 | |
| 108 | AArch64_reloc_property::AArch64_reloc_property( |
| 109 | unsigned int code, |
| 110 | const char* name, |
| 111 | Reloc_type rtype, |
| 112 | Reloc_class rclass, |
| 113 | bool is_implemented, |
| 114 | int group_index, |
| 115 | int reference_flags, |
| 116 | Reloc_inst reloc_inst, |
| 117 | rvalue_checkup_func_p rvalue_checkup_func, |
| 118 | rvalue_bit_select_func rvalue_bit_select) |
| 119 | : code_(code), name_(name), reloc_type_(rtype), reloc_class_(rclass), |
| 120 | group_index_(group_index), |
| 121 | is_implemented_(is_implemented), |
| 122 | reference_flags_(reference_flags), |
| 123 | reloc_inst_(reloc_inst), |
| 124 | rvalue_checkup_func_(rvalue_checkup_func), |
| 125 | rvalue_bit_select_func_(rvalue_bit_select) |
| 126 | {} |
| 127 | |
| 128 | AArch64_reloc_property_table::AArch64_reloc_property_table() |
| 129 | { |
| 130 | const bool Y(true), N(false); |
| 131 | for (unsigned int i = 0; i < Property_table_size; ++i) |
| 132 | table_[i] = NULL; |
| 133 | |
| 134 | #define RL_CHECK_ALIGN2 (1 << 16) |
| 135 | #define RL_CHECK_ALIGN4 (3 << 16) |
| 136 | #define RL_CHECK_ALIGN8 (7 << 16) |
| 137 | #define RL_CHECK_ALIGN16 (15 << 16) |
| 138 | |
| 139 | #undef ARD |
| 140 | #define ARD(rname, type, class, is_implemented, group_index, LB, UB, BSL, BSH, RFLAGS, inst) \ |
| 141 | do \ |
| 142 | { \ |
| 143 | int tidx = code_to_array_index(elfcpp::R_AARCH64_##rname); \ |
| 144 | AArch64_reloc_property * p = new AArch64_reloc_property( \ |
| 145 | elfcpp::R_AARCH64_##rname, "R_AARCH64_" #rname, \ |
| 146 | AArch64_reloc_property::RT_##type, \ |
| 147 | AArch64_reloc_property::RC_##class, \ |
| 148 | is_implemented, \ |
| 149 | group_index, \ |
| 150 | (RFLAGS), \ |
| 151 | AArch64_reloc_property::INST_##inst, \ |
| 152 | rvalue_checkup<LB,UB>, \ |
| 153 | rvalue_bit_select<BSL,BSH>); \ |
| 154 | table_[tidx] = p; \ |
| 155 | } \ |
| 156 | while (0); |
| 157 | #include"aarch64-reloc.def" |
| 158 | #undef ARD |
| 159 | } |
| 160 | |
| 161 | // Return a string describing a relocation code that fails to get a |
| 162 | // relocation property in get_implemented_static_reloc_property(). |
| 163 | |
| 164 | std::string |
| 165 | AArch64_reloc_property_table::reloc_name_in_error_message(unsigned int code) |
| 166 | { |
| 167 | int tidx = code_to_array_index(code); |
| 168 | const AArch64_reloc_property* arp = this->table_[tidx]; |
| 169 | |
| 170 | if (arp == NULL) |
| 171 | { |
| 172 | char buffer[100]; |
| 173 | sprintf(buffer, _("invalid reloc %u"), code); |
| 174 | return std::string(buffer); |
| 175 | } |
| 176 | |
| 177 | // gold only implements static relocation codes. |
| 178 | AArch64_reloc_property::Reloc_type reloc_type = arp->reloc_type(); |
| 179 | gold_assert(reloc_type == AArch64_reloc_property::RT_STATIC |
| 180 | || !arp->is_implemented()); |
| 181 | |
| 182 | const char* prefix = NULL; |
| 183 | switch (reloc_type) |
| 184 | { |
| 185 | case AArch64_reloc_property::RT_STATIC: |
| 186 | prefix = arp->is_implemented() ? _("reloc ") : _("unimplemented reloc "); |
| 187 | break; |
| 188 | case AArch64_reloc_property::RT_DYNAMIC: |
| 189 | prefix = _("dynamic reloc "); |
| 190 | break; |
| 191 | default: |
| 192 | gold_unreachable(); |
| 193 | } |
| 194 | return std::string(prefix) + arp->name(); |
| 195 | } |
| 196 | |
| 197 | } |