mirror of
https://github.com/PabloMK7/citra.git
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360 lines
9.3 KiB
C++
360 lines
9.3 KiB
C++
// Copyright 2013 Dolphin Emulator Project / 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <string>
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#include <memory>
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#include "common/common.h"
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#include "common/file_util.h"
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#include "common/symbols.h"
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#include "core/mem_map.h"
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#include "core/loader/elf.h"
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#include "core/hle/kernel/kernel.h"
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// ELF Header Constants
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// File type
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enum ElfType {
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ET_NONE = 0,
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ET_REL = 1,
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ET_EXEC = 2,
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ET_DYN = 3,
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ET_CORE = 4,
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ET_LOPROC = 0xFF00,
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ET_HIPROC = 0xFFFF,
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};
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// Machine/Architecture
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enum ElfMachine {
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EM_NONE = 0,
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EM_M32 = 1,
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EM_SPARC = 2,
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EM_386 = 3,
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EM_68K = 4,
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EM_88K = 5,
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EM_860 = 7,
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EM_MIPS = 8
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};
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// File version
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#define EV_NONE 0
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#define EV_CURRENT 1
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// Identification index
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#define EI_MAG0 0
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#define EI_MAG1 1
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#define EI_MAG2 2
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#define EI_MAG3 3
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#define EI_CLASS 4
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#define EI_DATA 5
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#define EI_VERSION 6
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#define EI_PAD 7
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#define EI_NIDENT 16
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// Sections constants
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// Section types
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#define SHT_NULL 0
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#define SHT_PROGBITS 1
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#define SHT_SYMTAB 2
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#define SHT_STRTAB 3
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#define SHT_RELA 4
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#define SHT_HASH 5
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#define SHT_DYNAMIC 6
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#define SHT_NOTE 7
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#define SHT_NOBITS 8
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#define SHT_REL 9
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#define SHT_SHLIB 10
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#define SHT_DYNSYM 11
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#define SHT_LOPROC 0x70000000
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#define SHT_HIPROC 0x7FFFFFFF
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#define SHT_LOUSER 0x80000000
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#define SHT_HIUSER 0xFFFFFFFF
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// Section flags
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enum ElfSectionFlags
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{
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SHF_WRITE = 0x1,
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SHF_ALLOC = 0x2,
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SHF_EXECINSTR = 0x4,
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SHF_MASKPROC = 0xF0000000,
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};
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// Segment types
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#define PT_NULL 0
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#define PT_LOAD 1
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#define PT_DYNAMIC 2
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#define PT_INTERP 3
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#define PT_NOTE 4
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#define PT_SHLIB 5
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#define PT_PHDR 6
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#define PT_LOPROC 0x70000000
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#define PT_HIPROC 0x7FFFFFFF
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typedef unsigned int Elf32_Addr;
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typedef unsigned short Elf32_Half;
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typedef unsigned int Elf32_Off;
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typedef signed int Elf32_Sword;
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typedef unsigned int Elf32_Word;
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// ELF file header
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struct Elf32_Ehdr {
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unsigned char e_ident[EI_NIDENT];
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Elf32_Half e_type;
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Elf32_Half e_machine;
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Elf32_Word e_version;
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Elf32_Addr e_entry;
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Elf32_Off e_phoff;
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Elf32_Off e_shoff;
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Elf32_Word e_flags;
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Elf32_Half e_ehsize;
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Elf32_Half e_phentsize;
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Elf32_Half e_phnum;
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Elf32_Half e_shentsize;
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Elf32_Half e_shnum;
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Elf32_Half e_shstrndx;
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};
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// Section header
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struct Elf32_Shdr {
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Elf32_Word sh_name;
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Elf32_Word sh_type;
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Elf32_Word sh_flags;
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Elf32_Addr sh_addr;
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Elf32_Off sh_offset;
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Elf32_Word sh_size;
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Elf32_Word sh_link;
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Elf32_Word sh_info;
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Elf32_Word sh_addralign;
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Elf32_Word sh_entsize;
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};
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// Segment header
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struct Elf32_Phdr {
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Elf32_Word p_type;
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Elf32_Off p_offset;
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Elf32_Addr p_vaddr;
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Elf32_Addr p_paddr;
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Elf32_Word p_filesz;
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Elf32_Word p_memsz;
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Elf32_Word p_flags;
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Elf32_Word p_align;
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};
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// Symbol table entry
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struct Elf32_Sym {
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Elf32_Word st_name;
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Elf32_Addr st_value;
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Elf32_Word st_size;
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unsigned char st_info;
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unsigned char st_other;
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Elf32_Half st_shndx;
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};
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// Relocation entries
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struct Elf32_Rel {
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Elf32_Addr r_offset;
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Elf32_Word r_info;
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// ElfReader class
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typedef int SectionID;
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class ElfReader {
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private:
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char *base;
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u32 *base32;
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Elf32_Ehdr *header;
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Elf32_Phdr *segments;
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Elf32_Shdr *sections;
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u32 *sectionAddrs;
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bool relocate;
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u32 entryPoint;
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public:
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ElfReader(void *ptr);
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u32 Read32(int off) const { return base32[off >> 2]; }
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// Quick accessors
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ElfType GetType() const { return (ElfType)(header->e_type); }
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ElfMachine GetMachine() const { return (ElfMachine)(header->e_machine); }
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u32 GetEntryPoint() const { return entryPoint; }
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u32 GetFlags() const { return (u32)(header->e_flags); }
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void LoadInto(u32 vaddr);
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bool LoadSymbols();
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int GetNumSegments() const { return (int)(header->e_phnum); }
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int GetNumSections() const { return (int)(header->e_shnum); }
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const u8 *GetPtr(int offset) const { return (u8*)base + offset; }
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const char *GetSectionName(int section) const;
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const u8 *GetSectionDataPtr(int section) const {
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if (section < 0 || section >= header->e_shnum)
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return nullptr;
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if (sections[section].sh_type != SHT_NOBITS)
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return GetPtr(sections[section].sh_offset);
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else
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return nullptr;
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}
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bool IsCodeSection(int section) const {
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return sections[section].sh_type == SHT_PROGBITS;
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}
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const u8 *GetSegmentPtr(int segment) {
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return GetPtr(segments[segment].p_offset);
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}
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u32 GetSectionAddr(SectionID section) const { return sectionAddrs[section]; }
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unsigned int GetSectionSize(SectionID section) const { return sections[section].sh_size; }
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SectionID GetSectionByName(const char *name, int firstSection = 0) const; //-1 for not found
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bool DidRelocate() const {
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return relocate;
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}
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};
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ElfReader::ElfReader(void *ptr) {
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base = (char*)ptr;
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base32 = (u32*)ptr;
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header = (Elf32_Ehdr*)ptr;
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segments = (Elf32_Phdr*)(base + header->e_phoff);
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sections = (Elf32_Shdr*)(base + header->e_shoff);
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entryPoint = header->e_entry;
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LoadSymbols();
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}
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const char *ElfReader::GetSectionName(int section) const {
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if (sections[section].sh_type == SHT_NULL)
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return nullptr;
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int name_offset = sections[section].sh_name;
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const char* ptr = (char*)GetSectionDataPtr(header->e_shstrndx);
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if (ptr)
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return ptr + name_offset;
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return nullptr;
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}
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void ElfReader::LoadInto(u32 vaddr) {
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LOG_DEBUG(Loader, "String section: %i", header->e_shstrndx);
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// Should we relocate?
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relocate = (header->e_type != ET_EXEC);
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if (relocate) {
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LOG_DEBUG(Loader, "Relocatable module");
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entryPoint += vaddr;
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} else {
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LOG_DEBUG(Loader, "Prerelocated executable");
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}
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LOG_DEBUG(Loader, "%i segments:", header->e_phnum);
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// First pass : Get the bits into RAM
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u32 segment_addr[32];
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u32 base_addr = relocate ? vaddr : 0;
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for (unsigned i = 0; i < header->e_phnum; i++) {
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Elf32_Phdr* p = segments + i;
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LOG_DEBUG(Loader, "Type: %i Vaddr: %08x Filesz: %i Memsz: %i ", p->p_type, p->p_vaddr,
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p->p_filesz, p->p_memsz);
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if (p->p_type == PT_LOAD) {
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segment_addr[i] = base_addr + p->p_vaddr;
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memcpy(Memory::GetPointer(segment_addr[i]), GetSegmentPtr(i), p->p_filesz);
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LOG_DEBUG(Loader, "Loadable Segment Copied to %08x, size %08x", segment_addr[i],
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p->p_memsz);
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}
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}
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LOG_DEBUG(Loader, "Done loading.");
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}
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SectionID ElfReader::GetSectionByName(const char *name, int firstSection) const {
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for (int i = firstSection; i < header->e_shnum; i++) {
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const char *secname = GetSectionName(i);
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if (secname != nullptr && strcmp(name, secname) == 0)
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return i;
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}
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return -1;
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}
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bool ElfReader::LoadSymbols() {
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bool hasSymbols = false;
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SectionID sec = GetSectionByName(".symtab");
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if (sec != -1) {
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int stringSection = sections[sec].sh_link;
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const char *stringBase = (const char *)GetSectionDataPtr(stringSection);
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//We have a symbol table!
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Elf32_Sym* symtab = (Elf32_Sym *)(GetSectionDataPtr(sec));
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unsigned int numSymbols = sections[sec].sh_size / sizeof(Elf32_Sym);
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for (unsigned sym = 0; sym < numSymbols; sym++) {
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int size = symtab[sym].st_size;
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if (size == 0)
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continue;
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int type = symtab[sym].st_info & 0xF;
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const char *name = stringBase + symtab[sym].st_name;
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Symbols::Add(symtab[sym].st_value, name, size, type);
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hasSymbols = true;
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}
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}
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return hasSymbols;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// Loader namespace
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namespace Loader {
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FileType AppLoader_ELF::IdentifyType(FileUtil::IOFile& file) {
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u32 magic;
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file.Seek(0, SEEK_SET);
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if (1 != file.ReadArray<u32>(&magic, 1))
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return FileType::Error;
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if (MakeMagic('\x7f', 'E', 'L', 'F') == magic)
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return FileType::ELF;
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return FileType::Error;
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}
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ResultStatus AppLoader_ELF::Load() {
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if (is_loaded)
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return ResultStatus::ErrorAlreadyLoaded;
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if (!file->IsOpen())
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return ResultStatus::Error;
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// Reset read pointer in case this file has been read before.
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file->Seek(0, SEEK_SET);
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u32 size = static_cast<u32>(file->GetSize());
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std::unique_ptr<u8[]> buffer(new u8[size]);
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if (file->ReadBytes(&buffer[0], size) != size)
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return ResultStatus::Error;
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ElfReader elf_reader(&buffer[0]);
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elf_reader.LoadInto(0x00100000);
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Kernel::LoadExec(elf_reader.GetEntryPoint());
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is_loaded = true;
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return ResultStatus::Success;
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}
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} // namespace Loader
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