1 // reloc.h -- relocate input files for gold -*- C++ -*-
13 class General_options;
15 class Read_relocs_data;
20 // A class to read the relocations for an object file, and then queue
21 // up a task to see if they require any GOT/PLT/COPY relocations in
24 class Read_relocs : public Task
27 // SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be
28 // unblocked when the Scan_relocs task completes.
29 Read_relocs(const General_options& options, Symbol_table* symtab,
30 Layout* layout, Relobj* object, Task_token* symtab_lock,
32 : options_(options), symtab_(symtab), layout_(layout), object_(object),
33 symtab_lock_(symtab_lock), blocker_(blocker)
36 // The standard Task methods.
39 is_runnable(Workqueue*);
48 const General_options& options_;
49 Symbol_table* symtab_;
52 Task_token* symtab_lock_;
56 // Scan the relocations for an object to see if they require any
57 // GOT/PLT/COPY relocations.
59 class Scan_relocs : public Task
62 // SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be
63 // unblocked when the task completes.
64 Scan_relocs(const General_options& options, Symbol_table* symtab,
65 Layout* layout, Relobj* object, Read_relocs_data* rd,
66 Task_token* symtab_lock, Task_token* blocker)
67 : options_(options), symtab_(symtab), layout_(layout), object_(object),
68 rd_(rd), symtab_lock_(symtab_lock), blocker_(blocker)
71 // The standard Task methods.
74 is_runnable(Workqueue*);
83 class Scan_relocs_locker;
85 const General_options& options_;
86 Symbol_table* symtab_;
89 Read_relocs_data* rd_;
90 Task_token* symtab_lock_;
94 // A class to perform all the relocations for an object file.
96 class Relocate_task : public Task
99 Relocate_task(const General_options& options, const Symbol_table* symtab,
100 const Layout* layout, Relobj* object, Output_file* of,
101 Task_token* final_blocker)
102 : options_(options), symtab_(symtab), layout_(layout), object_(object),
103 of_(of), final_blocker_(final_blocker)
106 // The standard Task methods.
109 is_runnable(Workqueue*);
118 class Relocate_locker;
120 const General_options& options_;
121 const Symbol_table* symtab_;
122 const Layout* layout_;
125 Task_token* final_blocker_;
128 // Standard relocation routines which are used on many targets. Here
129 // SIZE and BIG_ENDIAN refer to the target, not the relocation type.
131 template<int size, bool big_endian>
132 class Relocate_functions
135 // Do a simple relocation with the addend in the section contents.
136 // VALSIZE is the size of the value.
137 template<int valsize>
139 rel(unsigned char* view,
140 typename elfcpp::Swap<valsize, big_endian>::Valtype value)
142 typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
143 Valtype* wv = reinterpret_cast<Valtype*>(view);
144 Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
145 elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value);
148 // Do a simple PC relative relocation with the addend in the section
149 // contents. VALSIZE is the size of the value.
150 template<int valsize>
152 pcrel(unsigned char* view,
153 typename elfcpp::Swap<valsize, big_endian>::Valtype value,
154 typename elfcpp::Elf_types<size>::Elf_Addr address)
156 typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
157 Valtype* wv = reinterpret_cast<Valtype*>(view);
158 Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv);
159 elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value - address);
162 typedef Relocate_functions<size, big_endian> This;
165 // Do a simple 8-bit REL relocation with the addend in the object
168 rel8(unsigned char* view, unsigned char value)
170 This::template rel<8>(view, value);
173 // Do a simple 8-bit PC relative relocation with the addend in the
176 pcrel8(unsigned char* view, unsigned char value,
177 typename elfcpp::Elf_types<size>::Elf_Addr address)
179 This::template pcrel<8>(view, value, address);
182 // Do a simple 16-bit REL relocation with the addend in the object
185 rel16(unsigned char* view, elfcpp::Elf_Half value)
187 This::template rel<16>(view, value);
190 // Do a simple 32-bit PC relative REL relocation with the addend in
191 // the object file data.
193 pcrel16(unsigned char* view, elfcpp::Elf_Word value,
194 typename elfcpp::Elf_types<size>::Elf_Addr address)
196 This::template pcrel<16>(view, value, address);
199 // Do a simple 32-bit REL relocation with the addend in the section
202 rel32(unsigned char* view, elfcpp::Elf_Word value)
204 This::template rel<32>(view, value);
207 // Do a simple 32-bit PC relative REL relocation with the addend in
208 // the section contents.
210 pcrel32(unsigned char* view, elfcpp::Elf_Word value,
211 typename elfcpp::Elf_types<size>::Elf_Addr address)
213 This::template pcrel<32>(view, value, address);
216 // Do a simple 64-bit REL relocation with the addend in the section
219 rel64(unsigned char* view, elfcpp::Elf_Xword value)
221 This::template rel<64>(view, value);
224 // Do a simple 64-bit PC relative REL relocation with the addend in
225 // the section contents.
227 pcrel64(unsigned char* view, elfcpp::Elf_Xword value,
228 typename elfcpp::Elf_types<size>::Elf_Addr address)
230 This::template pcrel<64>(view, value, address);
233 // Return whether we need a COPY reloc for a reloc against GSYM,
234 // which is being applied to section SHNDX in OBJECT.
236 need_copy_reloc(const General_options*, Relobj* object, unsigned int shndx,
240 } // End namespace gold.
242 #endif // !defined(GOLD_RELOC_H)