Create separate Android.mk for main build targets

The runtime, compiler, dex2oat, and oatdump now are in seperate trees
to prevent dependency creep.  They can now be individually built
without rebuilding the rest of the art projects. dalvikvm and jdwpspy
were already this way. Builds in the art directory should behave as
before, building everything including tests.

Change-Id: Ic6b1151e5ed0f823c3dd301afd2b13eb2d8feb81

1 files changed, 279 insertions, 0 deletions

diff --git a/compiler/elf_fixup.cc b/compiler/elf_fixup.cc
new file mode 100644
index 000000000..127bc85d2
--- /dev/null
+++ b/compiler/elf_fixup.cc
@@ -0,0 +1,279 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "elf_fixup.h"
+
+#include "base/logging.h"
+#include "base/stringprintf.h"
+#include "elf_file.h"
+#include "elf_writer.h"
+#include "UniquePtr.h"
+
+namespace art {
+
+static const bool DEBUG_FIXUP = false;
+
+bool ElfFixup::Fixup(File* file, uintptr_t oat_data_begin) {
+  UniquePtr<ElfFile> elf_file(ElfFile::Open(file, true, false));
+  CHECK(elf_file.get() != NULL);
+
+  // Lookup "oatdata" symbol address.
+  ::llvm::ELF::Elf32_Addr oatdata_address = ElfWriter::GetOatDataAddress(elf_file.get());
+  ::llvm::ELF::Elf32_Off base_address = oat_data_begin - oatdata_address;
+
+  if (!FixupDynamic(*elf_file.get(), base_address)) {
+      LOG(WARNING) << "Failed fo fixup .dynamic in " << file->GetPath();
+      return false;
+  }
+  if (!FixupSectionHeaders(*elf_file.get(), base_address)) {
+      LOG(WARNING) << "Failed fo fixup section headers in " << file->GetPath();
+      return false;
+  }
+  if (!FixupProgramHeaders(*elf_file.get(), base_address)) {
+      LOG(WARNING) << "Failed fo fixup program headers in " << file->GetPath();
+      return false;
+  }
+  if (!FixupSymbols(*elf_file.get(), base_address, true)) {
+      LOG(WARNING) << "Failed fo fixup .dynsym in " << file->GetPath();
+      return false;
+  }
+  if (!FixupSymbols(*elf_file.get(), base_address, false)) {
+      LOG(WARNING) << "Failed fo fixup .symtab in " << file->GetPath();
+      return false;
+  }
+  if (!FixupRelocations(*elf_file.get(), base_address)) {
+      LOG(WARNING) << "Failed fo fixup .rel.dyn in " << file->GetPath();
+      return false;
+  }
+  return true;
+}
+
+// MIPS seems to break the rules d_val vs d_ptr even though their values are between DT_LOPROC and DT_HIPROC
+#define DT_MIPS_RLD_VERSION  0x70000001 // d_val
+#define DT_MIPS_TIME_STAMP   0x70000002 // d_val
+#define DT_MIPS_ICHECKSUM    0x70000003 // d_val
+#define DT_MIPS_IVERSION     0x70000004 // d_val
+#define DT_MIPS_FLAGS        0x70000005 // d_val
+#define DT_MIPS_BASE_ADDRESS 0x70000006 // d_ptr
+#define DT_MIPS_CONFLICT     0x70000008 // d_ptr
+#define DT_MIPS_LIBLIST      0x70000009 // d_ptr
+#define DT_MIPS_LOCAL_GOTNO  0x7000000A // d_val
+#define DT_MIPS_CONFLICTNO   0x7000000B // d_val
+#define DT_MIPS_LIBLISTNO    0x70000010 // d_val
+#define DT_MIPS_SYMTABNO     0x70000011 // d_val
+#define DT_MIPS_UNREFEXTNO   0x70000012 // d_val
+#define DT_MIPS_GOTSYM       0x70000013 // d_val
+#define DT_MIPS_HIPAGENO     0x70000014 // d_val
+#define DT_MIPS_RLD_MAP      0x70000016 // d_ptr
+
+bool ElfFixup::FixupDynamic(ElfFile& elf_file, uintptr_t base_address) {
+  // TODO: C++0x auto.
+  for (::llvm::ELF::Elf32_Word i = 0; i < elf_file.GetDynamicNum(); i++) {
+    ::llvm::ELF::Elf32_Dyn& elf_dyn = elf_file.GetDynamic(i);
+    ::llvm::ELF::Elf32_Word d_tag = elf_dyn.d_tag;
+    bool elf_dyn_needs_fixup = false;
+    switch (d_tag) {
+      // case 1: well known d_tag values that imply Elf32_Dyn.d_un contains an address in d_ptr
+      case ::llvm::ELF::DT_PLTGOT:
+      case ::llvm::ELF::DT_HASH:
+      case ::llvm::ELF::DT_STRTAB:
+      case ::llvm::ELF::DT_SYMTAB:
+      case ::llvm::ELF::DT_RELA:
+      case ::llvm::ELF::DT_INIT:
+      case ::llvm::ELF::DT_FINI:
+      case ::llvm::ELF::DT_REL:
+      case ::llvm::ELF::DT_DEBUG:
+      case ::llvm::ELF::DT_JMPREL: {
+        elf_dyn_needs_fixup = true;
+        break;
+      }
+      // d_val or ignored values
+      case ::llvm::ELF::DT_NULL:
+      case ::llvm::ELF::DT_NEEDED:
+      case ::llvm::ELF::DT_PLTRELSZ:
+      case ::llvm::ELF::DT_RELASZ:
+      case ::llvm::ELF::DT_RELAENT:
+      case ::llvm::ELF::DT_STRSZ:
+      case ::llvm::ELF::DT_SYMENT:
+      case ::llvm::ELF::DT_SONAME:
+      case ::llvm::ELF::DT_RPATH:
+      case ::llvm::ELF::DT_SYMBOLIC:
+      case ::llvm::ELF::DT_RELSZ:
+      case ::llvm::ELF::DT_RELENT:
+      case ::llvm::ELF::DT_PLTREL:
+      case ::llvm::ELF::DT_TEXTREL:
+      case ::llvm::ELF::DT_BIND_NOW:
+      case ::llvm::ELF::DT_INIT_ARRAYSZ:
+      case ::llvm::ELF::DT_FINI_ARRAYSZ:
+      case ::llvm::ELF::DT_RUNPATH:
+      case ::llvm::ELF::DT_FLAGS: {
+        break;
+      }
+      // boundary values that should not be used
+      case ::llvm::ELF::DT_ENCODING:
+      case ::llvm::ELF::DT_LOOS:
+      case ::llvm::ELF::DT_HIOS:
+      case ::llvm::ELF::DT_LOPROC:
+      case ::llvm::ELF::DT_HIPROC: {
+        LOG(FATAL) << "Illegal d_tag value 0x" << std::hex << d_tag;
+        break;
+      }
+      default: {
+        // case 2: "regular" DT_* ranges where even d_tag values imply an address in d_ptr
+        if ((::llvm::ELF::DT_ENCODING  < d_tag && d_tag < ::llvm::ELF::DT_LOOS)
+            || (::llvm::ELF::DT_LOOS   < d_tag && d_tag < ::llvm::ELF::DT_HIOS)
+            || (::llvm::ELF::DT_LOPROC < d_tag && d_tag < ::llvm::ELF::DT_HIPROC)) {
+          // Special case for MIPS which breaks the regular rules between DT_LOPROC and DT_HIPROC
+          if (elf_file.GetHeader().e_machine == ::llvm::ELF::EM_MIPS) {
+            switch (d_tag) {
+              case DT_MIPS_RLD_VERSION:
+              case DT_MIPS_TIME_STAMP:
+              case DT_MIPS_ICHECKSUM:
+              case DT_MIPS_IVERSION:
+              case DT_MIPS_FLAGS:
+              case DT_MIPS_LOCAL_GOTNO:
+              case DT_MIPS_CONFLICTNO:
+              case DT_MIPS_LIBLISTNO:
+              case DT_MIPS_SYMTABNO:
+              case DT_MIPS_UNREFEXTNO:
+              case DT_MIPS_GOTSYM:
+              case DT_MIPS_HIPAGENO: {
+                break;
+              }
+              case DT_MIPS_BASE_ADDRESS:
+              case DT_MIPS_CONFLICT:
+              case DT_MIPS_LIBLIST:
+              case DT_MIPS_RLD_MAP: {
+                elf_dyn_needs_fixup = true;
+                break;
+              }
+              default: {
+                LOG(FATAL) << "Unknown MIPS d_tag value 0x" << std::hex << d_tag;
+                break;
+              }
+            }
+          } else if ((elf_dyn.d_tag % 2) == 0) {
+            elf_dyn_needs_fixup = true;
+          }
+        } else {
+          LOG(FATAL) << "Unknown d_tag value 0x" << std::hex << d_tag;
+        }
+        break;
+      }
+    }
+    if (elf_dyn_needs_fixup) {
+      uint32_t d_ptr = elf_dyn.d_un.d_ptr;
+      if (DEBUG_FIXUP) {
+        LOG(INFO) << StringPrintf("In %s moving Elf32_Dyn[%d] from 0x%08x to 0x%08x",
+                                  elf_file.GetFile().GetPath().c_str(), i,
+                                  d_ptr, d_ptr + base_address);
+      }
+      d_ptr += base_address;
+      elf_dyn.d_un.d_ptr = d_ptr;
+    }
+  }
+  return true;
+}
+
+bool ElfFixup::FixupSectionHeaders(ElfFile& elf_file, uintptr_t base_address) {
+  for (::llvm::ELF::Elf32_Word i = 0; i < elf_file.GetSectionHeaderNum(); i++) {
+    ::llvm::ELF::Elf32_Shdr& sh = elf_file.GetSectionHeader(i);
+    // 0 implies that the section will not exist in the memory of the process
+    if (sh.sh_addr == 0) {
+      continue;
+    }
+    if (DEBUG_FIXUP) {
+      LOG(INFO) << StringPrintf("In %s moving Elf32_Shdr[%d] from 0x%08x to 0x%08x",
+                                elf_file.GetFile().GetPath().c_str(), i,
+                                sh.sh_addr, sh.sh_addr + base_address);
+    }
+    sh.sh_addr += base_address;
+  }
+  return true;
+}
+
+bool ElfFixup::FixupProgramHeaders(ElfFile& elf_file, uintptr_t base_address) {
+  // TODO: ELFObjectFile doesn't have give to Elf32_Phdr, so we do that ourselves for now.
+  for (::llvm::ELF::Elf32_Word i = 0; i < elf_file.GetProgramHeaderNum(); i++) {
+    ::llvm::ELF::Elf32_Phdr& ph = elf_file.GetProgramHeader(i);
+    CHECK_EQ(ph.p_vaddr, ph.p_paddr) << elf_file.GetFile().GetPath() << " i=" << i;
+    CHECK((ph.p_align == 0) || (0 == ((ph.p_vaddr - ph.p_offset) & (ph.p_align - 1))))
+            << elf_file.GetFile().GetPath() << " i=" << i;
+    if (DEBUG_FIXUP) {
+      LOG(INFO) << StringPrintf("In %s moving Elf32_Phdr[%d] from 0x%08x to 0x%08x",
+                                elf_file.GetFile().GetPath().c_str(), i,
+                                ph.p_vaddr, ph.p_vaddr + base_address);
+    }
+    ph.p_vaddr += base_address;
+    ph.p_paddr += base_address;
+    CHECK((ph.p_align == 0) || (0 == ((ph.p_vaddr - ph.p_offset) & (ph.p_align - 1))))
+            << elf_file.GetFile().GetPath() << " i=" << i;
+  }
+  return true;
+}
+
+bool ElfFixup::FixupSymbols(ElfFile& elf_file, uintptr_t base_address, bool dynamic) {
+  ::llvm::ELF::Elf32_Word section_type = dynamic ? ::llvm::ELF::SHT_DYNSYM : ::llvm::ELF::SHT_SYMTAB;
+  // TODO: Unfortunate ELFObjectFile has protected symbol access, so use ElfFile
+  ::llvm::ELF::Elf32_Shdr* symbol_section = elf_file.FindSectionByType(section_type);
+  if (symbol_section == NULL) {
+    // file is missing optional .symtab
+    CHECK(!dynamic) << elf_file.GetFile().GetPath();
+    return true;
+  }
+  for (uint32_t i = 0; i < elf_file.GetSymbolNum(*symbol_section); i++) {
+    ::llvm::ELF::Elf32_Sym& symbol = elf_file.GetSymbol(section_type, i);
+    if (symbol.st_value != 0) {
+      if (DEBUG_FIXUP) {
+        LOG(INFO) << StringPrintf("In %s moving Elf32_Sym[%d] from 0x%08x to 0x%08x",
+                                  elf_file.GetFile().GetPath().c_str(), i,
+                                  symbol.st_value, symbol.st_value + base_address);
+      }
+      symbol.st_value += base_address;
+    }
+  }
+  return true;
+}
+
+bool ElfFixup::FixupRelocations(ElfFile& elf_file, uintptr_t base_address) {
+  for (llvm::ELF::Elf32_Word i = 0; i < elf_file.GetSectionHeaderNum(); i++) {
+    llvm::ELF::Elf32_Shdr& sh = elf_file.GetSectionHeader(i);
+    if (sh.sh_type == llvm::ELF::SHT_REL) {
+      for (uint32_t i = 0; i < elf_file.GetRelNum(sh); i++) {
+        llvm::ELF::Elf32_Rel& rel = elf_file.GetRel(sh, i);
+        if (DEBUG_FIXUP) {
+          LOG(INFO) << StringPrintf("In %s moving Elf32_Rel[%d] from 0x%08x to 0x%08x",
+                                    elf_file.GetFile().GetPath().c_str(), i,
+                                    rel.r_offset, rel.r_offset + base_address);
+        }
+        rel.r_offset += base_address;
+      }
+    } else if (sh.sh_type == llvm::ELF::SHT_RELA) {
+      for (uint32_t i = 0; i < elf_file.GetRelaNum(sh); i++) {
+        llvm::ELF::Elf32_Rela& rela = elf_file.GetRela(sh, i);
+        if (DEBUG_FIXUP) {
+          LOG(INFO) << StringPrintf("In %s moving Elf32_Rela[%d] from 0x%08x to 0x%08x",
+                                    elf_file.GetFile().GetPath().c_str(), i,
+                                    rela.r_offset, rela.r_offset + base_address);
+        }
+        rela.r_offset += base_address;
+      }
+    }
+  }
+  return true;
+}
+
+}  // namespace art