From 1da361c7ab55e1dbe6709a738e228bfab5a5bb78 Mon Sep 17 00:00:00 2001
From: bunnei <ericbunnie@gmail.com>
Date: Mon, 16 Jun 2014 23:05:10 -0400
Subject: Elf: Renamed modules to be consistent with new loader naming, fixed
 tabs -> spaces.

---
 src/core/loader/elf.cpp | 190 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 190 insertions(+)
 create mode 100644 src/core/loader/elf.cpp

(limited to 'src/core/loader/elf.cpp')

diff --git a/src/core/loader/elf.cpp b/src/core/loader/elf.cpp
new file mode 100644
index 00000000..153c30f5
--- /dev/null
+++ b/src/core/loader/elf.cpp
@@ -0,0 +1,190 @@
+// Copyright 2013 Dolphin Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#include <string>
+
+#include "common/common.h"
+
+#include "common/symbols.h"
+#include "core/mem_map.h"
+#include "core/loader/elf.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);
+
+    entryPoint = header->e_entry;
+
+    LoadSymbols();
+}
+
+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);
+
+    // 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);
+        }
+    }
+
+
+    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;
+}
+
+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 = 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;
+
+            Symbols::Add(symtab[sym].st_value, name, size, type);
+
+            hasSymbols = true;
+        }
+    }
+
+    return hasSymbols;
+}
-- 
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