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-rw-r--r--src/core/loader/elf.cpp318
1 files changed, 257 insertions, 61 deletions
diff --git a/src/core/loader/elf.cpp b/src/core/loader/elf.cpp
index f93354817..065601546 100644
--- a/src/core/loader/elf.cpp
+++ b/src/core/loader/elf.cpp
@@ -3,6 +3,7 @@
// Refer to the license.txt file included.
#include <string>
+#include <memory>
#include "common/common.h"
#include "common/file_util.h"
@@ -12,6 +13,220 @@
#include "core/loader/elf.h"
#include "core/hle/kernel/kernel.h"
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// ELF Header Constants
+
+// File type
+enum ElfType {
+ ET_NONE = 0,
+ ET_REL = 1,
+ ET_EXEC = 2,
+ ET_DYN = 3,
+ ET_CORE = 4,
+ ET_LOPROC = 0xFF00,
+ ET_HIPROC = 0xFFFF,
+};
+
+// Machine/Architecture
+enum ElfMachine {
+ EM_NONE = 0,
+ EM_M32 = 1,
+ EM_SPARC = 2,
+ EM_386 = 3,
+ EM_68K = 4,
+ EM_88K = 5,
+ EM_860 = 7,
+ EM_MIPS = 8
+};
+
+// File version
+#define EV_NONE 0
+#define EV_CURRENT 1
+
+// Identification index
+#define EI_MAG0 0
+#define EI_MAG1 1
+#define EI_MAG2 2
+#define EI_MAG3 3
+#define EI_CLASS 4
+#define EI_DATA 5
+#define EI_VERSION 6
+#define EI_PAD 7
+#define EI_NIDENT 16
+
+// Magic number
+#define ELFMAG0 0x7F
+#define ELFMAG1 'E'
+#define ELFMAG2 'L'
+#define ELFMAG3 'F'
+
+// Sections constants
+
+// Section types
+#define SHT_NULL 0
+#define SHT_PROGBITS 1
+#define SHT_SYMTAB 2
+#define SHT_STRTAB 3
+#define SHT_RELA 4
+#define SHT_HASH 5
+#define SHT_DYNAMIC 6
+#define SHT_NOTE 7
+#define SHT_NOBITS 8
+#define SHT_REL 9
+#define SHT_SHLIB 10
+#define SHT_DYNSYM 11
+#define SHT_LOPROC 0x70000000
+#define SHT_HIPROC 0x7FFFFFFF
+#define SHT_LOUSER 0x80000000
+#define SHT_HIUSER 0xFFFFFFFF
+
+// Section flags
+enum ElfSectionFlags
+{
+ SHF_WRITE = 0x1,
+ SHF_ALLOC = 0x2,
+ SHF_EXECINSTR = 0x4,
+ SHF_MASKPROC = 0xF0000000,
+};
+
+// Segment types
+#define PT_NULL 0
+#define PT_LOAD 1
+#define PT_DYNAMIC 2
+#define PT_INTERP 3
+#define PT_NOTE 4
+#define PT_SHLIB 5
+#define PT_PHDR 6
+#define PT_LOPROC 0x70000000
+#define PT_HIPROC 0x7FFFFFFF
+
+typedef unsigned int Elf32_Addr;
+typedef unsigned short Elf32_Half;
+typedef unsigned int Elf32_Off;
+typedef signed int Elf32_Sword;
+typedef unsigned int Elf32_Word;
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// ELF file header
+
+struct Elf32_Ehdr {
+ unsigned char e_ident[EI_NIDENT];
+ Elf32_Half e_type;
+ Elf32_Half e_machine;
+ Elf32_Word e_version;
+ Elf32_Addr e_entry;
+ Elf32_Off e_phoff;
+ Elf32_Off e_shoff;
+ Elf32_Word e_flags;
+ Elf32_Half e_ehsize;
+ Elf32_Half e_phentsize;
+ Elf32_Half e_phnum;
+ Elf32_Half e_shentsize;
+ Elf32_Half e_shnum;
+ Elf32_Half e_shstrndx;
+};
+
+// Section header
+struct Elf32_Shdr {
+ Elf32_Word sh_name;
+ Elf32_Word sh_type;
+ Elf32_Word sh_flags;
+ Elf32_Addr sh_addr;
+ Elf32_Off sh_offset;
+ Elf32_Word sh_size;
+ Elf32_Word sh_link;
+ Elf32_Word sh_info;
+ Elf32_Word sh_addralign;
+ Elf32_Word sh_entsize;
+};
+
+// Segment header
+struct Elf32_Phdr {
+ Elf32_Word p_type;
+ Elf32_Off p_offset;
+ Elf32_Addr p_vaddr;
+ Elf32_Addr p_paddr;
+ Elf32_Word p_filesz;
+ Elf32_Word p_memsz;
+ Elf32_Word p_flags;
+ Elf32_Word p_align;
+};
+
+// Symbol table entry
+struct Elf32_Sym {
+ Elf32_Word st_name;
+ Elf32_Addr st_value;
+ Elf32_Word st_size;
+ unsigned char st_info;
+ unsigned char st_other;
+ Elf32_Half st_shndx;
+};
+
+// Relocation entries
+struct Elf32_Rel {
+ Elf32_Addr r_offset;
+ Elf32_Word r_info;
+};
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// ElfReader class
+
+typedef int SectionID;
+
+class ElfReader {
+private:
+ char *base;
+ u32 *base32;
+
+ Elf32_Ehdr *header;
+ Elf32_Phdr *segments;
+ Elf32_Shdr *sections;
+
+ u32 *sectionAddrs;
+ bool relocate;
+ u32 entryPoint;
+
+public:
+ ElfReader(void *ptr);
+ ~ElfReader() { }
+
+ u32 Read32(int off) const { return base32[off >> 2]; }
+
+ // Quick accessors
+ ElfType GetType() const { return (ElfType)(header->e_type); }
+ ElfMachine GetMachine() const { return (ElfMachine)(header->e_machine); }
+ u32 GetEntryPoint() const { return entryPoint; }
+ u32 GetFlags() const { return (u32)(header->e_flags); }
+ bool LoadInto(u32 vaddr);
+ bool LoadSymbols();
+
+ int GetNumSegments() const { return (int)(header->e_phnum); }
+ int GetNumSections() const { return (int)(header->e_shnum); }
+ const u8 *GetPtr(int offset) const { return (u8*)base + offset; }
+ const char *GetSectionName(int section) const;
+ const u8 *GetSectionDataPtr(int section) const {
+ if (section < 0 || section >= header->e_shnum)
+ return nullptr;
+ if (sections[section].sh_type != SHT_NOBITS)
+ return GetPtr(sections[section].sh_offset);
+ else
+ return nullptr;
+ }
+ bool IsCodeSection(int section) const {
+ return sections[section].sh_type == SHT_PROGBITS;
+ }
+ const u8 *GetSegmentPtr(int segment) {
+ return GetPtr(segments[segment].p_offset);
+ }
+ u32 GetSectionAddr(SectionID section) const { return sectionAddrs[section]; }
+ int GetSectionSize(SectionID section) const { return sections[section].sh_size; }
+ SectionID GetSectionByName(const char *name, int firstSection = 0) const; //-1 for not found
+
+ bool DidRelocate() {
+ return relocate;
+ }
+};
+
ElfReader::ElfReader(void *ptr) {
base = (char*)ptr;
base32 = (u32 *)ptr;
@@ -29,28 +244,25 @@ const char *ElfReader::GetSectionName(int section) const {
if (sections[section].sh_type == SHT_NULL)
return nullptr;
- int nameOffset = sections[section].sh_name;
+ int name_offset = sections[section].sh_name;
char *ptr = (char*)GetSectionDataPtr(header->e_shstrndx);
if (ptr)
- return ptr + nameOffset;
- else
- return nullptr;
+ return ptr + name_offset;
+
+ return nullptr;
}
bool ElfReader::LoadInto(u32 vaddr) {
DEBUG_LOG(MASTER_LOG, "String section: %i", header->e_shstrndx);
// Should we relocate?
- bRelocate = (header->e_type != ET_EXEC);
+ relocate = (header->e_type != ET_EXEC);
- if (bRelocate)
- {
+ if (relocate) {
DEBUG_LOG(MASTER_LOG, "Relocatable module");
entryPoint += vaddr;
- }
- else
- {
+ } else {
DEBUG_LOG(MASTER_LOG, "Prerelocated executable");
}
@@ -58,17 +270,14 @@ bool ElfReader::LoadInto(u32 vaddr) {
// First pass : Get the bits into RAM
u32 segmentVAddr[32];
+ u32 baseAddress = relocate ? vaddr : 0;
- u32 baseAddress = bRelocate ? vaddr : 0;
-
- for (int i = 0; i < header->e_phnum; i++)
- {
+ for (int i = 0; i < header->e_phnum; i++) {
Elf32_Phdr *p = segments + i;
INFO_LOG(MASTER_LOG, "Type: %i Vaddr: %08x Filesz: %i Memsz: %i ", p->p_type, p->p_vaddr, p->p_filesz, p->p_memsz);
- if (p->p_type == PT_LOAD)
- {
+ if (p->p_type == PT_LOAD) {
segmentVAddr[i] = baseAddress + p->p_vaddr;
u32 writeAddr = segmentVAddr[i];
@@ -78,27 +287,19 @@ bool ElfReader::LoadInto(u32 vaddr) {
u32 dstSize = p->p_memsz;
u32 *s = (u32*)src;
u32 *d = (u32*)dst;
- for (int j = 0; j < (int)(srcSize + 3) / 4; j++)
- {
- *d++ = /*_byteswap_ulong*/(*s++);
- }
- if (srcSize < dstSize)
- {
- //memset(dst + srcSize, 0, dstSize-srcSize); //zero out bss
+ for (int j = 0; j < (int)(srcSize + 3) / 4; j++) {
+ *d++ = (*s++);
}
INFO_LOG(MASTER_LOG, "Loadable Segment Copied to %08x, size %08x", writeAddr, p->p_memsz);
}
}
-
INFO_LOG(MASTER_LOG, "Done loading.");
return true;
}
-SectionID ElfReader::GetSectionByName(const char *name, int firstSection) const
-{
- for (int i = firstSection; i < header->e_shnum; i++)
- {
+SectionID ElfReader::GetSectionByName(const char *name, int firstSection) const {
+ for (int i = firstSection; i < header->e_shnum; i++) {
const char *secname = GetSectionName(i);
if (secname != nullptr && strcmp(name, secname) == 0)
@@ -107,25 +308,21 @@ SectionID ElfReader::GetSectionByName(const char *name, int firstSection) const
return -1;
}
-bool ElfReader::LoadSymbols()
-{
+bool ElfReader::LoadSymbols() {
bool hasSymbols = false;
SectionID sec = GetSectionByName(".symtab");
- if (sec != -1)
- {
+ if (sec != -1) {
int stringSection = sections[sec].sh_link;
const char *stringBase = (const char *)GetSectionDataPtr(stringSection);
//We have a symbol table!
Elf32_Sym *symtab = (Elf32_Sym *)(GetSectionDataPtr(sec));
int numSymbols = sections[sec].sh_size / sizeof(Elf32_Sym);
- for (int sym = 0; sym < numSymbols; sym++)
- {
+ for (int sym = 0; sym < numSymbols; sym++) {
int size = symtab[sym].st_size;
if (size == 0)
continue;
- // int bind = symtab[sym].st_info >> 4;
int type = symtab[sym].st_info & 0xF;
const char *name = stringBase + symtab[sym].st_name;
@@ -144,42 +341,41 @@ bool ElfReader::LoadSymbols()
namespace Loader {
+/// AppLoader_ELF constructor
+AppLoader_ELF::AppLoader_ELF(std::string& filename) : is_loaded(false) {
+ this->filename = filename;
+}
+
+/// AppLoader_NCCH destructor
+AppLoader_ELF::~AppLoader_ELF() {
+}
+
/**
- * Loads an ELF file
- * @param filename String filename of ELF file
+ * Loads an NCCH file (e.g. from a CCI, or the first NCCH in a CXI)
* @param error_string Pointer to string to put error message if an error has occurred
+ * @todo Move NCSD parsing out of here and create a separate function for loading these
* @return True on success, otherwise false
*/
-bool Load_ELF(std::string& filename, std::string* error_string) {
- std::string full_path = filename;
- std::string path, file, extension;
- SplitPath(ReplaceAll(full_path, "\\", "/"), &path, &file, &extension);
-#if EMU_PLATFORM == PLATFORM_WINDOWS
- path = ReplaceAll(path, "/", "\\");
-#endif
- File::IOFile f(filename, "rb");
+const ResultStatus AppLoader_ELF::Load() {
+ INFO_LOG(LOADER, "Loading ELF file %s...", filename.c_str());
- if (f.IsOpen()) {
- u32 size = (u32)f.GetSize();
- u8* buffer = new u8[size];
- ElfReader* elf_reader = NULL;
+ if (is_loaded)
+ return ResultStatus::ErrorAlreadyLoaded;
- f.ReadBytes(buffer, size);
+ File::IOFile file(filename, "rb");
- elf_reader = new ElfReader(buffer);
- elf_reader->LoadInto(0x00100000);
+ if (file.IsOpen()) {
+ u32 size = (u32)file.GetSize();
+ std::unique_ptr<u8[]> buffer(new u8[size]);
+ file.ReadBytes(&buffer[0], size);
- Kernel::LoadExec(elf_reader->GetEntryPoint());
-
- delete[] buffer;
- delete elf_reader;
+ ElfReader elf_reader(&buffer[0]);
+ elf_reader.LoadInto(0x00100000);
+ Kernel::LoadExec(elf_reader.GetEntryPoint());
} else {
- *error_string = "Unable to open ELF file!";
- return false;
+ return ResultStatus::Error;
}
- f.Close();
-
- return true;
+ return ResultStatus::Success;
}
} // namespace Loader
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