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