summaryrefslogtreecommitdiff
path: root/src/core/loader/elf.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/core/loader/elf.cpp')
-rw-r--r--src/core/loader/elf.cpp263
1 files changed, 0 insertions, 263 deletions
diff --git a/src/core/loader/elf.cpp b/src/core/loader/elf.cpp
deleted file mode 100644
index dfb10c34f..000000000
--- a/src/core/loader/elf.cpp
+++ /dev/null
@@ -1,263 +0,0 @@
1// SPDX-FileCopyrightText: 2013 Dolphin Emulator Project
2// SPDX-FileCopyrightText: 2014 Citra Emulator Project
3// SPDX-License-Identifier: GPL-2.0-or-later
4
5#include <cstring>
6#include <memory>
7#include "common/common_funcs.h"
8#include "common/common_types.h"
9#include "common/elf.h"
10#include "common/logging/log.h"
11#include "core/hle/kernel/code_set.h"
12#include "core/hle/kernel/k_page_table.h"
13#include "core/hle/kernel/k_process.h"
14#include "core/loader/elf.h"
15#include "core/memory.h"
16
17using namespace Common::ELF;
18
19////////////////////////////////////////////////////////////////////////////////////////////////////
20// ElfReader class
21
22typedef int SectionID;
23
24class ElfReader {
25private:
26 char* base;
27 u32* base32;
28
29 Elf32_Ehdr* header;
30 Elf32_Phdr* segments;
31 Elf32_Shdr* sections;
32
33 u32* sectionAddrs;
34 bool relocate;
35 VAddr entryPoint;
36
37public:
38 explicit ElfReader(void* ptr);
39
40 u32 Read32(int off) const {
41 return base32[off >> 2];
42 }
43
44 // Quick accessors
45 u16 GetType() const {
46 return header->e_type;
47 }
48 u16 GetMachine() const {
49 return header->e_machine;
50 }
51 VAddr GetEntryPoint() const {
52 return entryPoint;
53 }
54 u32 GetFlags() const {
55 return (u32)(header->e_flags);
56 }
57 Kernel::CodeSet LoadInto(VAddr vaddr);
58
59 int GetNumSegments() const {
60 return (int)(header->e_phnum);
61 }
62 int GetNumSections() const {
63 return (int)(header->e_shnum);
64 }
65 const u8* GetPtr(int offset) const {
66 return (u8*)base + offset;
67 }
68 const char* GetSectionName(int section) const;
69 const u8* GetSectionDataPtr(int section) const {
70 if (section < 0 || section >= header->e_shnum)
71 return nullptr;
72 if (sections[section].sh_type != ElfShtNobits)
73 return GetPtr(sections[section].sh_offset);
74 else
75 return nullptr;
76 }
77 bool IsCodeSection(int section) const {
78 return sections[section].sh_type == ElfShtProgBits;
79 }
80 const u8* GetSegmentPtr(int segment) {
81 return GetPtr(segments[segment].p_offset);
82 }
83 u32 GetSectionAddr(SectionID section) const {
84 return sectionAddrs[section];
85 }
86 unsigned int GetSectionSize(SectionID section) const {
87 return sections[section].sh_size;
88 }
89 SectionID GetSectionByName(const char* name, int firstSection = 0) const; //-1 for not found
90
91 bool DidRelocate() const {
92 return relocate;
93 }
94};
95
96ElfReader::ElfReader(void* ptr) {
97 base = (char*)ptr;
98 base32 = (u32*)ptr;
99 header = (Elf32_Ehdr*)ptr;
100
101 segments = (Elf32_Phdr*)(base + header->e_phoff);
102 sections = (Elf32_Shdr*)(base + header->e_shoff);
103
104 entryPoint = header->e_entry;
105}
106
107const char* ElfReader::GetSectionName(int section) const {
108 if (sections[section].sh_type == ElfShtNull)
109 return nullptr;
110
111 int name_offset = sections[section].sh_name;
112 const char* ptr = reinterpret_cast<const char*>(GetSectionDataPtr(header->e_shstrndx));
113
114 if (ptr)
115 return ptr + name_offset;
116
117 return nullptr;
118}
119
120Kernel::CodeSet ElfReader::LoadInto(VAddr vaddr) {
121 LOG_DEBUG(Loader, "String section: {}", header->e_shstrndx);
122
123 // Should we relocate?
124 relocate = (header->e_type != ElfTypeExec);
125
126 if (relocate) {
127 LOG_DEBUG(Loader, "Relocatable module");
128 entryPoint += vaddr;
129 } else {
130 LOG_DEBUG(Loader, "Prerelocated executable");
131 }
132 LOG_DEBUG(Loader, "{} segments:", header->e_phnum);
133
134 // First pass : Get the bits into RAM
135 const VAddr base_addr = relocate ? vaddr : 0;
136
137 u64 total_image_size = 0;
138 for (unsigned int i = 0; i < header->e_phnum; ++i) {
139 const Elf32_Phdr* p = &segments[i];
140 if (p->p_type == ElfPtLoad) {
141 total_image_size += (p->p_memsz + 0xFFF) & ~0xFFF;
142 }
143 }
144
145 Kernel::PhysicalMemory program_image(total_image_size);
146 std::size_t current_image_position = 0;
147
148 Kernel::CodeSet codeset;
149
150 for (unsigned int i = 0; i < header->e_phnum; ++i) {
151 const Elf32_Phdr* p = &segments[i];
152 LOG_DEBUG(Loader, "Type: {} Vaddr: {:08X} Filesz: {:08X} Memsz: {:08X} ", p->p_type,
153 p->p_vaddr, p->p_filesz, p->p_memsz);
154
155 if (p->p_type == ElfPtLoad) {
156 Kernel::CodeSet::Segment* codeset_segment;
157 u32 permission_flags = p->p_flags & (ElfPfRead | ElfPfWrite | ElfPfExec);
158 if (permission_flags == (ElfPfRead | ElfPfExec)) {
159 codeset_segment = &codeset.CodeSegment();
160 } else if (permission_flags == (ElfPfRead)) {
161 codeset_segment = &codeset.RODataSegment();
162 } else if (permission_flags == (ElfPfRead | ElfPfWrite)) {
163 codeset_segment = &codeset.DataSegment();
164 } else {
165 LOG_ERROR(Loader, "Unexpected ELF PT_LOAD segment id {} with flags {:X}", i,
166 p->p_flags);
167 continue;
168 }
169
170 if (codeset_segment->size != 0) {
171 LOG_ERROR(Loader,
172 "ELF has more than one segment of the same type. Skipping extra "
173 "segment (id {})",
174 i);
175 continue;
176 }
177
178 const VAddr segment_addr = base_addr + p->p_vaddr;
179 const u32 aligned_size = (p->p_memsz + 0xFFF) & ~0xFFF;
180
181 codeset_segment->offset = current_image_position;
182 codeset_segment->addr = segment_addr;
183 codeset_segment->size = aligned_size;
184
185 std::memcpy(program_image.data() + current_image_position, GetSegmentPtr(i),
186 p->p_filesz);
187 current_image_position += aligned_size;
188 }
189 }
190
191 codeset.entrypoint = base_addr + header->e_entry;
192 codeset.memory = std::move(program_image);
193
194 LOG_DEBUG(Loader, "Done loading.");
195
196 return codeset;
197}
198
199SectionID ElfReader::GetSectionByName(const char* name, int firstSection) const {
200 for (int i = firstSection; i < header->e_shnum; i++) {
201 const char* secname = GetSectionName(i);
202
203 if (secname != nullptr && strcmp(name, secname) == 0)
204 return i;
205 }
206 return -1;
207}
208
209////////////////////////////////////////////////////////////////////////////////////////////////////
210// Loader namespace
211
212namespace Loader {
213
214AppLoader_ELF::AppLoader_ELF(FileSys::VirtualFile file_) : AppLoader(std::move(file_)) {}
215
216FileType AppLoader_ELF::IdentifyType(const FileSys::VirtualFile& elf_file) {
217 static constexpr u16 ELF_MACHINE_ARM{0x28};
218
219 u32 magic = 0;
220 if (4 != elf_file->ReadObject(&magic)) {
221 return FileType::Error;
222 }
223
224 u16 machine = 0;
225 if (2 != elf_file->ReadObject(&machine, 18)) {
226 return FileType::Error;
227 }
228
229 if (Common::MakeMagic('\x7f', 'E', 'L', 'F') == magic && ELF_MACHINE_ARM == machine) {
230 return FileType::ELF;
231 }
232
233 return FileType::Error;
234}
235
236AppLoader_ELF::LoadResult AppLoader_ELF::Load(Kernel::KProcess& process,
237 [[maybe_unused]] Core::System& system) {
238 if (is_loaded) {
239 return {ResultStatus::ErrorAlreadyLoaded, {}};
240 }
241
242 std::vector<u8> buffer = file->ReadAllBytes();
243 if (buffer.size() != file->GetSize()) {
244 return {ResultStatus::ErrorIncorrectELFFileSize, {}};
245 }
246
247 const VAddr base_address = process.PageTable().GetCodeRegionStart();
248 ElfReader elf_reader(&buffer[0]);
249 Kernel::CodeSet codeset = elf_reader.LoadInto(base_address);
250 const VAddr entry_point = codeset.entrypoint;
251
252 // Setup the process code layout
253 if (process.LoadFromMetadata(FileSys::ProgramMetadata::GetDefault(), buffer.size()).IsError()) {
254 return {ResultStatus::ErrorNotInitialized, {}};
255 }
256
257 process.LoadModule(std::move(codeset), entry_point);
258
259 is_loaded = true;
260 return {ResultStatus::Success, LoadParameters{48, Core::Memory::DEFAULT_STACK_SIZE}};
261}
262
263} // namespace Loader
HIC SVNT DRACONES