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authorbunnei <ericbunnie@gmail.com>2014-06-17 05:05:10 +0200
committerbunnei <ericbunnie@gmail.com>2014-06-17 05:43:32 +0200
commit1da361c7ab55e1dbe6709a738e228bfab5a5bb78 (patch)
tree487be34416c624106a01edf8b075866fb2cb9d33 /src/core/loader/elf.cpp
parentLoader: Added support for booting NCCH executables. (diff)
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Diffstat (limited to 'src/core/loader/elf.cpp')
-rw-r--r--src/core/loader/elf.cpp190
1 files changed, 190 insertions, 0 deletions
diff --git a/src/core/loader/elf.cpp b/src/core/loader/elf.cpp
new file mode 100644
index 000000000..153c30f51
--- /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;
+}