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a2fb1b05 ILT |
1 | // output.cc -- manage the output file for gold |
2 | ||
3 | #include "gold.h" | |
4 | ||
5 | #include <cstdlib> | |
6 | ||
7 | #include "object.h" | |
8 | #include "output.h" | |
9 | ||
10 | namespace gold | |
11 | { | |
12 | ||
13 | // Output_data methods. | |
14 | ||
15 | Output_data::~Output_data() | |
16 | { | |
17 | } | |
18 | ||
19 | // Output_data_const methods. | |
20 | ||
21 | void | |
22 | Output_data_const::write(Output_file* output, off_t off) | |
23 | { | |
24 | output->write(off, data_.data(), data_.size()); | |
25 | } | |
26 | ||
54dc6425 ILT |
27 | // Output_segment_header methods. |
28 | ||
29 | void | |
30 | Output_segment_headers::write(Output_file*, off_t) | |
31 | { | |
32 | // FIXME: Unimplemented. | |
33 | abort(); | |
34 | } | |
35 | ||
a2fb1b05 ILT |
36 | // Output_section methods. |
37 | ||
38 | // Construct an Output_section. NAME will point into a Stringpool. | |
39 | ||
40 | Output_section::Output_section(const char* name, elfcpp::Elf_Word type, | |
41 | elfcpp::Elf_Xword flags) | |
42 | : name_(name), | |
43 | addr_(0), | |
44 | addralign_(0), | |
45 | entsize_(0), | |
46 | offset_(0), | |
a2fb1b05 ILT |
47 | link_(0), |
48 | info_(0), | |
49 | type_(type), | |
50 | flags_(flags) | |
51 | { | |
52 | } | |
53 | ||
54dc6425 ILT |
54 | Output_section::~Output_section() |
55 | { | |
56 | } | |
57 | ||
a2fb1b05 ILT |
58 | // Add an input section to an Output_section. We don't keep track of |
59 | // input sections for an Output_section. Instead, each Object keeps | |
60 | // track of the Output_section for each of its input sections. | |
61 | ||
62 | template<int size, bool big_endian> | |
63 | off_t | |
64 | Output_section::add_input_section(Object* object, const char* secname, | |
65 | const elfcpp::Shdr<size, big_endian>& shdr) | |
66 | { | |
67 | elfcpp::Elf_Xword addralign = shdr.get_sh_addralign(); | |
68 | if ((addralign & (addralign - 1)) != 0) | |
69 | { | |
70 | fprintf(stderr, _("%s: %s: invalid alignment %lu for section \"%s\"\n"), | |
71 | program_name, object->name().c_str(), | |
72 | static_cast<unsigned long>(addralign), secname); | |
73 | gold_exit(false); | |
74 | } | |
a2fb1b05 ILT |
75 | |
76 | if (addralign > this->addralign_) | |
77 | this->addralign_ = addralign; | |
78 | ||
54dc6425 ILT |
79 | off_t ssize = this->get_size(); |
80 | ssize = (ssize + addralign - 1) &~ (addralign - 1); | |
a2fb1b05 | 81 | |
54dc6425 ILT |
82 | this->set_size(ssize + shdr.get_sh_size()); |
83 | ||
84 | return size; | |
a2fb1b05 ILT |
85 | } |
86 | ||
87 | // Output segment methods. | |
88 | ||
89 | Output_segment::Output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags) | |
54dc6425 | 90 | : output_data_(), |
a2fb1b05 ILT |
91 | vaddr_(0), |
92 | paddr_(0), | |
93 | memsz_(0), | |
94 | align_(0), | |
95 | offset_(0), | |
96 | filesz_(0), | |
97 | type_(type), | |
98 | flags_(flags) | |
99 | { | |
100 | } | |
101 | ||
102 | // Add an Output_section to an Output_segment. | |
103 | ||
104 | void | |
105 | Output_segment::add_output_section(Output_section* os) | |
106 | { | |
54dc6425 ILT |
107 | // Update the segment flags. |
108 | this->flags_ |= os->flags() & (elfcpp::PF_R | elfcpp::PF_W | elfcpp::PF_X); | |
109 | ||
a2fb1b05 ILT |
110 | // So that PT_NOTE segments will work correctly, we need to ensure |
111 | // that all SHT_NOTE sections are adjacent. This will normally | |
112 | // happen automatically, because all the SHT_NOTE input sections | |
113 | // will wind up in the same output section. However, it is possible | |
114 | // for multiple SHT_NOTE input sections to have different section | |
115 | // flags, and thus be in different output sections, but for the | |
116 | // different section flags to map into the same segment flags and | |
117 | // thus the same output segment. | |
54dc6425 ILT |
118 | |
119 | // Note that while there may be many input sections in an output | |
120 | // section, there are normally only a few output sections in an | |
121 | // output segment. This loop is expected to be fast. | |
122 | ||
a2fb1b05 ILT |
123 | if (os->type() == elfcpp::SHT_NOTE) |
124 | { | |
54dc6425 ILT |
125 | for (Layout::Data_list::iterator p = this->output_data_.begin(); |
126 | p != this->output_data_.end(); | |
127 | ++p) | |
128 | { | |
129 | if ((*p)->is_section_type(elfcpp::SHT_NOTE)) | |
130 | { | |
131 | ++p; | |
132 | this->output_data_.insert(p, os); | |
133 | return; | |
134 | } | |
135 | } | |
136 | } | |
137 | ||
138 | // Similarly, so that PT_TLS segments will work, we need to group | |
139 | // SHF_TLS sections. | |
140 | if ((os->flags() & elfcpp::SHF_TLS) != 0) | |
141 | { | |
142 | for (Layout::Data_list::iterator p = this->output_data_.begin(); | |
143 | p != this->output_data_.end(); | |
a2fb1b05 ILT |
144 | ++p) |
145 | { | |
54dc6425 | 146 | if ((*p)->is_section_flag_set(elfcpp::SHF_TLS)) |
a2fb1b05 ILT |
147 | { |
148 | ++p; | |
54dc6425 | 149 | this->output_data_.insert(p, os); |
a2fb1b05 ILT |
150 | return; |
151 | } | |
152 | } | |
153 | } | |
154 | ||
54dc6425 | 155 | this->output_data_.push_back(os); |
a2fb1b05 ILT |
156 | } |
157 | ||
158 | // Output_file methods. | |
159 | ||
160 | void | |
161 | Output_file::write(off_t, const void*, off_t) | |
162 | { | |
163 | abort(); | |
164 | } | |
165 | ||
166 | // Instantiate the templates we need. We could use the configure | |
167 | // script to restrict this to only the ones for implemented targets. | |
168 | ||
169 | template | |
170 | off_t | |
171 | Output_section::add_input_section<32, false>( | |
172 | Object* object, | |
173 | const char* secname, | |
174 | const elfcpp::Shdr<32, false>& shdr); | |
175 | ||
176 | template | |
177 | off_t | |
178 | Output_section::add_input_section<32, true>( | |
179 | Object* object, | |
180 | const char* secname, | |
181 | const elfcpp::Shdr<32, true>& shdr); | |
182 | ||
183 | template | |
184 | off_t | |
185 | Output_section::add_input_section<64, false>( | |
186 | Object* object, | |
187 | const char* secname, | |
188 | const elfcpp::Shdr<64, false>& shdr); | |
189 | ||
190 | template | |
191 | off_t | |
192 | Output_section::add_input_section<64, true>( | |
193 | Object* object, | |
194 | const char* secname, | |
195 | const elfcpp::Shdr<64, true>& shdr); | |
196 | ||
197 | } // End namespace gold. |