1 files changed, 239 insertions, 0 deletions

diff --git a/src/core/elf/elf_reader.cpp b/src/core/elf/elf_reader.cpp
new file mode 100644
index 000000000..aef7c13e9
--- /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;
+}
+*/