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bb04269c DK |
1 | // target.cc |
2 | ||
3 | // Copyright 2009 Free Software Foundation, Inc. | |
4 | // Written by Doug Kwan <dougkwan@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 | #include "target.h" | |
f733487b | 25 | #include "dynobj.h" |
c0a62865 | 26 | #include "output.h" |
364c7fa5 | 27 | #include "elfcpp.h" |
bb04269c DK |
28 | |
29 | namespace gold | |
30 | { | |
31 | ||
32 | // Return whether NAME is a local label name. This is used to implement the | |
33 | // --discard-locals options and can be overriden by children classes to | |
34 | // implement system-specific behaviour. The logic here is the same as that | |
35 | // in _bfd_elf_is_local_label_name(). | |
36 | ||
37 | bool | |
38 | Target::do_is_local_label_name (const char* name) const | |
39 | { | |
40 | // Normal local symbols start with ``.L''. | |
41 | if (name[0] == '.' && name[1] == 'L') | |
42 | return true; | |
43 | ||
44 | // At least some SVR4 compilers (e.g., UnixWare 2.1 cc) generate | |
45 | // DWARF debugging symbols starting with ``..''. | |
46 | if (name[0] == '.' && name[1] == '.') | |
47 | return true; | |
48 | ||
49 | // gcc will sometimes generate symbols beginning with ``_.L_'' when | |
50 | // emitting DWARF debugging output. I suspect this is actually a | |
51 | // small bug in gcc (it calls ASM_OUTPUT_LABEL when it should call | |
52 | // ASM_GENERATE_INTERNAL_LABEL, and this causes the leading | |
53 | // underscore to be emitted on some ELF targets). For ease of use, | |
54 | // we treat such symbols as local. | |
55 | if (name[0] == '_' && name[1] == '.' && name[2] == 'L' && name[3] == '_') | |
56 | return true; | |
57 | ||
58 | return false; | |
59 | } | |
60 | ||
f733487b DK |
61 | // Implementations of methods Target::do_make_elf_object are almost identical |
62 | // except for the address sizes and endianities. So we extract this | |
63 | // into a template. | |
64 | ||
65 | template<int size, bool big_endian> | |
66 | inline Object* | |
67 | Target::do_make_elf_object_implementation( | |
68 | const std::string& name, | |
69 | Input_file* input_file, | |
70 | off_t offset, | |
71 | const elfcpp::Ehdr<size, big_endian>& ehdr) | |
72 | { | |
73 | int et = ehdr.get_e_type(); | |
74 | if (et == elfcpp::ET_REL) | |
75 | { | |
76 | Sized_relobj<size, big_endian>* obj = | |
77 | new Sized_relobj<size, big_endian>(name, input_file, offset, ehdr); | |
029ba973 | 78 | obj->setup(); |
f733487b DK |
79 | return obj; |
80 | } | |
81 | else if (et == elfcpp::ET_DYN) | |
82 | { | |
83 | Sized_dynobj<size, big_endian>* obj = | |
84 | new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr); | |
029ba973 | 85 | obj->setup(); |
f733487b DK |
86 | return obj; |
87 | } | |
88 | else | |
89 | { | |
90 | gold_error(_("%s: unsupported ELF file type %d"), | |
91 | name.c_str(), et); | |
92 | return NULL; | |
93 | } | |
94 | } | |
95 | ||
96 | // Make an ELF object called NAME by reading INPUT_FILE at OFFSET. EHDR | |
97 | // is the ELF header of the object. There are four versions of this | |
98 | // for different address sizes and endianities. | |
99 | ||
100 | #ifdef HAVE_TARGET_32_LITTLE | |
101 | Object* | |
102 | Target::do_make_elf_object(const std::string& name, Input_file* input_file, | |
103 | off_t offset, const elfcpp::Ehdr<32, false>& ehdr) | |
104 | { | |
105 | return this->do_make_elf_object_implementation<32, false>(name, input_file, | |
106 | offset, ehdr); | |
107 | } | |
108 | #endif | |
109 | ||
110 | #ifdef HAVE_TARGET_32_BIG | |
111 | Object* | |
112 | Target::do_make_elf_object(const std::string& name, Input_file* input_file, | |
113 | off_t offset, const elfcpp::Ehdr<32, true>& ehdr) | |
114 | { | |
115 | return this->do_make_elf_object_implementation<32, true>(name, input_file, | |
116 | offset, ehdr); | |
117 | } | |
118 | #endif | |
119 | ||
120 | #ifdef HAVE_TARGET_64_LITTLE | |
121 | Object* | |
122 | Target::do_make_elf_object(const std::string& name, Input_file* input_file, | |
123 | off_t offset, const elfcpp::Ehdr<64, false>& ehdr) | |
124 | { | |
125 | return this->do_make_elf_object_implementation<64, false>(name, input_file, | |
126 | offset, ehdr); | |
127 | } | |
128 | #endif | |
129 | ||
130 | #ifdef HAVE_TARGET_64_BIG | |
131 | Object* | |
132 | Target::do_make_elf_object(const std::string& name, Input_file* input_file, | |
133 | off_t offset, const elfcpp::Ehdr<64, true>& ehdr) | |
134 | { | |
135 | return this->do_make_elf_object_implementation<64, true>(name, input_file, | |
136 | offset, ehdr); | |
137 | } | |
138 | #endif | |
139 | ||
c0a62865 DK |
140 | Output_section* |
141 | Target::do_make_output_section(const char* name, elfcpp::Elf_Word type, | |
142 | elfcpp::Elf_Xword flags) | |
143 | { | |
144 | return new Output_section(name, type, flags); | |
145 | } | |
146 | ||
364c7fa5 ILT |
147 | // Default conversion for -fsplit-stack is to give an error. |
148 | ||
149 | void | |
150 | Target::do_calls_non_split(Relobj* object, unsigned int, section_offset_type, | |
151 | section_size_type, unsigned char*, section_size_type, | |
152 | std::string*, std::string*) const | |
153 | { | |
154 | static bool warned; | |
155 | if (!warned) | |
156 | { | |
157 | gold_error(_("linker does not include stack split support " | |
158 | "required by %s"), | |
159 | object->name().c_str()); | |
160 | warned = true; | |
161 | } | |
162 | } | |
163 | ||
164 | // Return whether BYTES/LEN matches VIEW/VIEW_SIZE at OFFSET. | |
165 | ||
166 | bool | |
167 | Target::match_view(const unsigned char* view, section_size_type view_size, | |
168 | section_offset_type offset, const char* bytes, | |
169 | size_t len) const | |
170 | { | |
171 | if (offset + len > view_size) | |
172 | return false; | |
173 | return memcmp(view + offset, bytes, len) == 0; | |
174 | } | |
175 | ||
176 | // Set the contents of a VIEW/VIEW_SIZE to nops starting at OFFSET | |
177 | // for LEN bytes. | |
178 | ||
179 | void | |
180 | Target::set_view_to_nop(unsigned char* view, section_size_type view_size, | |
181 | section_offset_type offset, size_t len) const | |
182 | { | |
183 | gold_assert(offset >= 0 && offset + len <= view_size); | |
184 | if (!this->has_code_fill()) | |
185 | memset(view + offset, 0, len); | |
186 | else | |
187 | { | |
188 | std::string fill = this->code_fill(len); | |
189 | memcpy(view + offset, fill.data(), len); | |
190 | } | |
191 | } | |
192 | ||
bb04269c | 193 | } // End namespace gold. |