1 // aarch64-reloc-property.h -- AArch64 relocation properties -*- C++ -*-
3 // Copyright (C) 2014-2018 Free Software Foundation, Inc.
4 // Written by Han Shen <shenhan@google.com> and Jing Yu <jingyu@google.com>.
6 // This file is part of gold.
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.
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.
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.
23 #ifndef GOLD_AARCH64_RELOC_PROPERTY_H
24 #define GOLD_AARCH64_RELOC_PROPERTY_H
33 // The AArch64_reloc_property class is to store information about a particular
36 class AArch64_reloc_property
39 // Types of relocation codes.
41 RT_NONE, // No relocation type.
42 RT_STATIC, // Relocations processed by static linkers.
43 RT_DYNAMIC, // Relocations processed by dynamic linkers.
46 // Classes of relocation codes.
48 RC_NONE, // No relocation class.
49 RC_DATA, // Data relocation.
50 RC_AARCH64, // Static AArch64 relocations
51 RC_CFLOW, // Control flow
52 RC_TLS, // Thread local storage
53 RC_DYNAMIC, // Dynamic relocation
56 // Instructions that are associated with relocations.
59 INST_MOVW = 1, // movz, movk, movn
60 INST_LD = 2, // ld literal
62 INST_ADRP = 4, // adrp
64 INST_LDST = 6, // ld/st
65 INST_TBZNZ = 7, // tbz/tbnz
66 INST_CONDB = 8, // B.cond
67 INST_B = 9, // b [25:0]
68 INST_CALL = 10, // bl [25:0]
69 INST_NUM = 11, // total number of entries in the table
72 // Types of bases of relative addressing relocation codes.
73 // enum Relative_address_base {
74 // RAB_NONE, // Relocation is not relative addressing
77 typedef bool (*rvalue_checkup_func_p)(int64_t);
78 typedef uint64_t (*rvalue_bit_select_func)(uint64_t);
80 // Relocation code represented by this.
83 { return this->code_; }
85 // Name of the relocation code.
88 { return this->name_; }
90 // Type of relocation code.
93 { return this->reloc_type_; }
95 // Class of relocation code.
98 { return this->reloc_class_; }
100 // Whether this code is implemented in gold.
102 is_implemented() const
103 { return this->is_implemented_; }
105 // If code is a group relocation code, return the group number, otherwise -1.
108 { return this->group_index_; }
110 // Return alignment of relocation.
113 { return this->align_; }
116 reference_flags() const
117 { return this->reference_flags_; }
119 // Instruction associated with this relocation.
122 { return this->reloc_inst_; }
124 // Check overflow of x
125 bool checkup_x_value(int64_t x) const
126 { return this->rvalue_checkup_func_(x); }
128 // Return portions of x as is defined in aarch64-reloc.def.
129 uint64_t select_x_value(uint64_t x) const
130 { return this->rvalue_bit_select_func_(x); }
133 // These are protected. We only allow AArch64_reloc_property_table to
134 // manage AArch64_reloc_property.
135 AArch64_reloc_property(unsigned int code, const char* name, Reloc_type rtype,
140 Reloc_inst reloc_inst,
141 rvalue_checkup_func_p rvalue_checkup_func,
142 rvalue_bit_select_func rvalue_bit_select);
144 friend class AArch64_reloc_property_table;
147 // Copying is not allowed.
148 AArch64_reloc_property(const AArch64_reloc_property&);
149 AArch64_reloc_property& operator=(const AArch64_reloc_property&);
152 const unsigned int code_;
154 const std::string name_;
155 // Type of relocation.
156 Reloc_type reloc_type_;
157 // Class of relocation.
158 Reloc_class reloc_class_;
159 // Group index (0, 1, or 2) if this is a group relocation or -1 otherwise.
161 // Size of relocation.
163 // Alignment of relocation.
165 // Relative address base.
166 // Relative_address_base relative_address_base_;
167 // Whether this is deprecated.
168 bool is_deprecated_ : 1;
169 // Whether this is implemented in gold.
170 bool is_implemented_ : 1;
171 // Whether this checks overflow.
172 bool checks_overflow_ : 1;
173 const int reference_flags_;
174 // Instruction associated with relocation.
175 Reloc_inst reloc_inst_;
176 rvalue_checkup_func_p rvalue_checkup_func_;
177 rvalue_bit_select_func rvalue_bit_select_func_;
180 class AArch64_reloc_property_table
183 AArch64_reloc_property_table();
185 const AArch64_reloc_property*
186 get_reloc_property(unsigned int code) const
188 unsigned int idx = code_to_array_index(code);
189 return this->table_[idx];
192 // Like get_reloc_property but only return non-NULL if relocation code is
193 // static and implemented.
194 const AArch64_reloc_property*
195 get_implemented_static_reloc_property(unsigned int code) const
197 unsigned int idx = code_to_array_index(code);
198 const AArch64_reloc_property* arp = this->table_[idx];
200 && (arp->reloc_type() == AArch64_reloc_property::RT_STATIC)
201 && arp->is_implemented())
206 // Return a string describing the relocation code that is not
207 // an implemented static reloc code.
209 reloc_name_in_error_message(unsigned int code);
212 // Copying is not allowed.
213 AArch64_reloc_property_table(const AArch64_reloc_property_table&);
214 AArch64_reloc_property_table& operator=(const AArch64_reloc_property_table&);
216 // Map aarch64 rtypes into range(0,300) as following
217 // 256 ~ 313 -> 0 ~ 57
218 // 512 ~ 573 -> 128 ~ 189
220 code_to_array_index(unsigned int code) const
222 if (code == 0) return 0;
223 if (!((code >= elfcpp::R_AARCH64_ABS64 &&
224 code <= elfcpp::R_AARCH64_LD64_GOTPAGE_LO15)
225 || (code >= elfcpp::R_AARCH64_TLSGD_ADR_PREL21 &&
226 code <= elfcpp::R_AARCH64_TLSLD_LDST128_DTPREL_LO12_NC)))
228 gold_error(_("Invalid/unrecognized reloc reloc %d."), code);
230 unsigned int rv = -1;
232 rv = 128 + code - 512; // 512 - 573
233 else if (code & (1 << 8))
234 rv = code - 256; // 256 - 313
235 gold_assert(rv <= Property_table_size);
239 static const unsigned int Property_table_size = 300;
240 AArch64_reloc_property* table_[Property_table_size];
241 }; // End of class AArch64_reloc_property_table
243 } // End namespace gold.
245 #endif // !defined(GOLD_AARCH64_RELOC_PROPERTY_H)