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