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
|
#include "ELFLoader.h"
#include <AK/Demangle.h>
#include <AK/QuickSort.h>
#include <AK/kstdio.h>
#ifdef KERNEL
#include <Kernel/VM/MemoryManager.h>
#endif
//#define ELFLOADER_DEBUG
ELFLoader::ELFLoader(const u8* buffer)
: m_image(buffer)
{
}
ELFLoader::~ELFLoader()
{
}
bool ELFLoader::load()
{
#ifdef ELFLOADER_DEBUG
m_image.dump();
#endif
if (!m_image.is_valid())
return false;
if (!layout())
return false;
return true;
}
bool ELFLoader::layout()
{
bool failed = false;
m_image.for_each_program_header([&](const ELFImage::ProgramHeader& program_header) {
if (program_header.type() == PT_TLS) {
#ifdef KERNEL
auto* tls_image = tls_section_hook(program_header.size_in_memory(), program_header.alignment());
if (!tls_image) {
failed = true;
return;
}
memcpy(tls_image, program_header.raw_data(), program_header.size_in_image());
#endif
return;
}
if (program_header.type() != PT_LOAD)
return;
#ifdef ELFLOADER_DEBUG
kprintf("PH: V%p %u r:%u w:%u\n", program_header.vaddr().get(), program_header.size_in_memory(), program_header.is_readable(), program_header.is_writable());
#endif
#ifdef KERNEL
if (program_header.is_writable()) {
auto* allocated_section = alloc_section_hook(
program_header.vaddr(),
program_header.size_in_memory(),
program_header.alignment(),
program_header.is_readable(),
program_header.is_writable(),
String::format("elf-alloc-%s%s", program_header.is_readable() ? "r" : "", program_header.is_writable() ? "w" : ""));
if (!allocated_section) {
failed = true;
return;
}
memcpy(program_header.vaddr().as_ptr(), program_header.raw_data(), program_header.size_in_image());
} else {
auto* mapped_section = map_section_hook(
program_header.vaddr(),
program_header.size_in_memory(),
program_header.alignment(),
program_header.offset(),
program_header.is_readable(),
program_header.is_writable(),
program_header.is_executable(),
String::format("elf-map-%s%s%s", program_header.is_readable() ? "r" : "", program_header.is_writable() ? "w" : "", program_header.is_executable() ? "x" : ""));
if (!mapped_section) {
failed = true;
}
}
#endif
});
return !failed;
}
char* ELFLoader::symbol_ptr(const char* name)
{
char* found_ptr = nullptr;
m_image.for_each_symbol([&](const ELFImage::Symbol symbol) {
if (symbol.type() != STT_FUNC)
return IterationDecision::Continue;
if (strcmp(symbol.name(), name))
return IterationDecision::Continue;
if (m_image.is_executable())
found_ptr = (char*)(size_t)symbol.value();
else
ASSERT_NOT_REACHED();
return IterationDecision::Break;
});
return found_ptr;
}
String ELFLoader::symbolicate(u32 address, u32* out_offset) const
{
SortedSymbol* sorted_symbols = nullptr;
#ifdef KERNEL
if (!m_sorted_symbols_region) {
m_sorted_symbols_region = MM.allocate_kernel_region(PAGE_ROUND_UP(m_image.symbol_count() * sizeof(SortedSymbol)), "Sorted symbols", Region::Access::Read | Region::Access::Write);
sorted_symbols = (SortedSymbol*)m_sorted_symbols_region->vaddr().as_ptr();
size_t index = 0;
m_image.for_each_symbol([&](auto& symbol) {
sorted_symbols[index++] = { symbol.value(), symbol.name() };
return IterationDecision::Continue;
});
quick_sort(sorted_symbols, sorted_symbols + m_image.symbol_count(), [](auto& a, auto& b) {
return a.address < b.address;
});
} else {
sorted_symbols = (SortedSymbol*)m_sorted_symbols_region->vaddr().as_ptr();
}
#else
if (m_sorted_symbols.is_empty()) {
m_sorted_symbols.ensure_capacity(m_image.symbol_count());
m_image.for_each_symbol([this](auto& symbol) {
m_sorted_symbols.append({ symbol.value(), symbol.name() });
return IterationDecision::Continue;
});
quick_sort(m_sorted_symbols.begin(), m_sorted_symbols.end(), [](auto& a, auto& b) {
return a.address < b.address;
});
}
sorted_symbols = m_sorted_symbols.data();
#endif
for (size_t i = 0; i < m_image.symbol_count(); ++i) {
if (sorted_symbols[i].address > address) {
if (i == 0)
return "!!";
auto& symbol = sorted_symbols[i - 1];
if (out_offset) {
*out_offset = address - symbol.address;
return demangle(symbol.name);
}
return String::format("%s +%u", demangle(symbol.name).characters(), address - symbol.address);
}
}
return "??";
}
|
