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-rw-r--r--src/core/elf/elf_reader.cpp239
-rw-r--r--src/core/elf/elf_reader.h75
-rw-r--r--src/core/elf/elf_types.h281
3 files changed, 595 insertions, 0 deletions
diff --git a/src/core/elf/elf_reader.cpp b/src/core/elf/elf_reader.cpp
new file mode 100644
index 00000000..aef7c13e
--- /dev/null
+++ b/src/core/elf/elf_reader.cpp
@@ -0,0 +1,239 @@
+// Copyright 2013 Dolphin Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#include <string>
+
+#include "common.h"
+#include "mem_map.h"
+
+#include "elf/elf_reader.h"
+//#include "Core/Debugger/Debugger_SymbolMap.h"
+//#include "Core/HW/Memmap.h"
+//#include "Core/PowerPC/PPCSymbolDB.h"
+
+//void bswap(Elf32_Word &w) {w = Common::swap32(w);}
+//void bswap(Elf32_Half &w) {w = Common::swap16(w);}
+
+#define bswap(w) w // Dirty bswap disable for now... 3DS is little endian, anyway
+
+static void byteswapHeader(Elf32_Ehdr &ELF_H)
+{
+ bswap(ELF_H.e_type);
+ bswap(ELF_H.e_machine);
+ bswap(ELF_H.e_ehsize);
+ bswap(ELF_H.e_phentsize);
+ bswap(ELF_H.e_phnum);
+ bswap(ELF_H.e_shentsize);
+ bswap(ELF_H.e_shnum);
+ bswap(ELF_H.e_shstrndx);
+ bswap(ELF_H.e_version);
+ bswap(ELF_H.e_entry);
+ bswap(ELF_H.e_phoff);
+ bswap(ELF_H.e_shoff);
+ bswap(ELF_H.e_flags);
+}
+
+static void byteswapSegment(Elf32_Phdr &sec)
+{
+ bswap(sec.p_align);
+ bswap(sec.p_filesz);
+ bswap(sec.p_flags);
+ bswap(sec.p_memsz);
+ bswap(sec.p_offset);
+ bswap(sec.p_paddr);
+ bswap(sec.p_vaddr);
+ bswap(sec.p_type);
+}
+
+static void byteswapSection(Elf32_Shdr &sec)
+{
+ bswap(sec.sh_addr);
+ bswap(sec.sh_addralign);
+ bswap(sec.sh_entsize);
+ bswap(sec.sh_flags);
+ bswap(sec.sh_info);
+ bswap(sec.sh_link);
+ bswap(sec.sh_name);
+ bswap(sec.sh_offset);
+ bswap(sec.sh_size);
+ bswap(sec.sh_type);
+}
+
+ElfReader::ElfReader(void *ptr)
+{
+ base = (char*)ptr;
+ base32 = (u32 *)ptr;
+ header = (Elf32_Ehdr*)ptr;
+ byteswapHeader(*header);
+
+ segments = (Elf32_Phdr *)(base + header->e_phoff);
+ sections = (Elf32_Shdr *)(base + header->e_shoff);
+
+ //for (int i = 0; i < GetNumSegments(); i++)
+ //{
+ // byteswapSegment(segments[i]);
+ //}
+
+ //for (int i = 0; i < GetNumSections(); i++)
+ //{
+ // byteswapSection(sections[i]);
+ //}
+ entryPoint = header->e_entry;
+}
+
+const char *ElfReader::GetSectionName(int section) const
+{
+ if (sections[section].sh_type == SHT_NULL)
+ return nullptr;
+
+ int nameOffset = sections[section].sh_name;
+ char *ptr = (char*)GetSectionDataPtr(header->e_shstrndx);
+
+ if (ptr)
+ return ptr + nameOffset;
+ else
+ return nullptr;
+}
+
+bool ElfReader::LoadInto(u32 vaddr)
+{
+ DEBUG_LOG(MASTER_LOG,"String section: %i", header->e_shstrndx);
+
+// sectionOffsets = new u32[GetNumSections()];
+// sectionAddrs = new u32[GetNumSections()];
+
+ // Should we relocate?
+ bRelocate = (header->e_type != ET_EXEC);
+
+ if (bRelocate)
+ {
+ DEBUG_LOG(MASTER_LOG,"Relocatable module");
+ entryPoint += vaddr;
+ }
+ else
+ {
+ DEBUG_LOG(MASTER_LOG,"Prerelocated executable");
+ }
+
+ INFO_LOG(MASTER_LOG,"%i segments:", header->e_phnum);
+
+ // First pass : Get the bits into RAM
+ u32 segmentVAddr[32];
+
+ u32 baseAddress = bRelocate?vaddr:0;
+
+ 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)
+ {
+ segmentVAddr[i] = baseAddress + p->p_vaddr;
+ u32 writeAddr = segmentVAddr[i];
+
+ const u8 *src = GetSegmentPtr(i);
+ u8 *dst = Memory::GetPointer(writeAddr);
+ u32 srcSize = p->p_filesz;
+ 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
+ }
+ INFO_LOG(MASTER_LOG,"Loadable Segment Copied to %08x, size %08x", writeAddr, p->p_memsz);
+ }
+ }
+
+ /*
+ LOG(MASTER_LOG,"%i sections:", header->e_shnum);
+
+ for (int i=0; i<GetNumSections(); i++)
+ {
+ Elf32_Shdr *s = &sections[i];
+ const char *name = GetSectionName(i);
+
+ u32 writeAddr = s->sh_addr + baseAddress;
+ sectionOffsets[i] = writeAddr - vaddr;
+ sectionAddrs[i] = writeAddr;
+
+ if (s->sh_flags & SHF_ALLOC)
+ {
+ LOG(MASTER_LOG,"Data Section found: %s Sitting at %08x, size %08x", name, writeAddr, s->sh_size);
+
+ }
+ else
+ {
+ LOG(MASTER_LOG,"NonData Section found: %s Ignoring (size=%08x) (flags=%08x)", name, s->sh_size, s->sh_flags);
+ }
+ }
+*/
+ 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++)
+ {
+ const char *secname = GetSectionName(i);
+
+ if (secname != nullptr && strcmp(name, secname) == 0)
+ return i;
+ }
+ return -1;
+}
+
+/* TODO(bunnei): The following is verbatim from Dolphin - needs to be updated for this project:
+
+bool ElfReader::LoadSymbols()
+{
+ bool hasSymbols = false;
+ SectionID sec = GetSectionByName(".symtab");
+ 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++)
+ {
+ int size = Common::swap32(symtab[sym].st_size);
+ if (size == 0)
+ continue;
+
+ // int bind = symtab[sym].st_info >> 4;
+ int type = symtab[sym].st_info & 0xF;
+ int sectionIndex = Common::swap16(symtab[sym].st_shndx);
+ int value = Common::swap32(symtab[sym].st_value);
+ const char *name = stringBase + Common::swap32(symtab[sym].st_name);
+ if (bRelocate)
+ value += sectionAddrs[sectionIndex];
+
+ int symtype = Symbol::SYMBOL_DATA;
+ switch (type)
+ {
+ case STT_OBJECT:
+ symtype = Symbol::SYMBOL_DATA; break;
+ case STT_FUNC:
+ symtype = Symbol::SYMBOL_FUNCTION; break;
+ default:
+ continue;
+ }
+ g_symbolDB.AddKnownSymbol(value, size, name, symtype);
+ hasSymbols = true;
+ }
+ }
+ g_symbolDB.Index();
+ return hasSymbols;
+}
+*/
diff --git a/src/core/elf/elf_reader.h b/src/core/elf/elf_reader.h
new file mode 100644
index 00000000..9393a589
--- /dev/null
+++ b/src/core/elf/elf_reader.h
@@ -0,0 +1,75 @@
+// Copyright 2013 Dolphin Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "elf/elf_types.h"
+
+enum KnownElfTypes
+{
+ KNOWNELF_PSP = 0,
+ KNOWNELF_DS = 1,
+ KNOWNELF_GBA = 2,
+ KNOWNELF_GC = 3,
+};
+
+typedef int SectionID;
+
+class ElfReader
+{
+private:
+ char *base;
+ u32 *base32;
+
+ Elf32_Ehdr *header;
+ Elf32_Phdr *segments;
+ Elf32_Shdr *sections;
+
+ u32 *sectionAddrs;
+ bool bRelocate;
+ 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 bRelocate;
+ }
+};
diff --git a/src/core/elf/elf_types.h b/src/core/elf/elf_types.h
new file mode 100644
index 00000000..f1bf3db7
--- /dev/null
+++ b/src/core/elf/elf_types.h
@@ -0,0 +1,281 @@
+// Copyright 2013 Dolphin Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+// 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'
+
+// File class
+#define ELFCLASSNONE 0
+#define ELFCLASS32 1
+#define ELFCLASS64 2
+
+// Encoding
+#define ELFDATANONE 0
+#define ELFDATA2LSB 1
+#define ELFDATA2MSB 2
+
+
+
+// Sections constants
+
+// Section indexes
+#define SHN_UNDEF 0
+#define SHN_LORESERVE 0xFF00
+#define SHN_LOPROC 0xFF00
+#define SHN_HIPROC 0xFF1F
+#define SHN_ABS 0xFFF1
+#define SHN_COMMON 0xFFF2
+#define SHN_HIRESERVE 0xFFFF
+
+// 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
+
+// Custom section types
+#define SHT_PSPREL 0x700000a0
+
+
+// Section flags
+enum ElfSectionFlags
+{
+ SHF_WRITE = 0x1,
+ SHF_ALLOC = 0x2,
+ SHF_EXECINSTR = 0x4,
+ SHF_MASKPROC = 0xF0000000,
+};
+
+// Symbol binding
+#define STB_LOCAL 0
+#define STB_GLOBAL 1
+#define STB_WEAK 2
+#define STB_LOPROC 13
+#define STB_HIPROC 15
+
+// Symbol types
+#define STT_NOTYPE 0
+#define STT_OBJECT 1
+#define STT_FUNC 2
+#define STT_SECTION 3
+#define STT_FILE 4
+#define STT_LOPROC 13
+#define STT_HIPROC 15
+
+// Undefined name
+#define STN_UNDEF 0
+
+// Relocation types
+#define R_386_NONE 0
+#define R_386_32 1
+#define R_386_PC32 2
+#define R_386_GOT32 3
+#define R_386_PLT32 4
+#define R_386_COPY 5
+#define R_386_GLOB_DAT 6
+#define R_386_JMP_SLOT 7
+#define R_386_RELATIVE 8
+#define R_386_GOTOFF 9
+#define R_386_GOTPC 10
+
+// 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
+
+// Segment flags
+#define PF_X 1
+#define PF_W 2
+#define PF_R 4
+
+// Dynamic Array Tags
+#define DT_NULL 0
+#define DT_NEEDED 1
+#define DT_PLTRELSZ 2
+#define DT_PLTGOT 3
+#define DT_HASH 4
+#define DT_STRTAB 5
+#define DT_SYMTAB 6
+#define DT_RELA 7
+#define DT_RELASZ 8
+#define DT_RELAENT 9
+#define DT_STRSZ 10
+#define DT_SYMENT 11
+#define DT_INIT 12
+#define DT_FINI 13
+#define DT_SONAME 14
+#define DT_RPATH 15
+#define DT_SYMBOLIC 16
+#define DT_REL 17
+#define DT_RELSZ 18
+#define DT_RELENT 19
+#define DT_PLTREL 20
+#define DT_DEBUG 21
+#define DT_TEXTREL 22
+#define DT_JMPREL 23
+#define DT_LOPROC 0x70000000
+#define DT_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;
+};
+
+#define ELF32_ST_BIND(i) ((i)>>4)
+#define ELF32_ST_TYPE(i) ((i)&0xf)
+#define ELF32_ST_INFO(b,t) (((b)<<4)+((t)&0xf))
+
+// Relocation entries
+struct Elf32_Rel
+{
+ Elf32_Addr r_offset;
+ Elf32_Word r_info;
+};
+
+struct Elf32_Rela
+{
+ Elf32_Addr r_offset;
+ Elf32_Word r_info;
+ Elf32_Sword r_addend;
+};
+
+#define ELF32_R_SYM(i) ((i)>>8)
+#define ELF32_R_TYPE(i) ((unsigned char)(i))
+#define ELF32_R_INFO(s,t) (((s)<<8 )+(unsigned char)(t))
+
+
+struct Elf32_Dyn
+{
+ Elf32_Sword d_tag;
+ union
+ {
+ Elf32_Word d_val;
+ Elf32_Addr d_ptr;
+ } d_un;
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-12 08:46:23 +0000