1 files changed, 122 insertions, 0 deletions
diff --git a/src/common/linux/elfutils.cc b/src/common/linux/elfutils.cc
new file mode 100644
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--- /dev/null
+++ b/src/common/linux/elfutils.cc
@@ -0,0 +1,122 @@
+// Copyright (c) 2012, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "common/linux/elfutils.h"
+
+#include <assert.h>
+#include <string.h>
+
+#include "common/linux/linux_libc_support.h"
+
+namespace google_breakpad {
+
+namespace {
+
+template<typename ElfClass>
+void FindElfClassSection(const char *elf_base,
+                         const char *section_name,
+                         uint32_t section_type,
+                         const void **section_start,
+                         int *section_size) {
+  typedef typename ElfClass::Ehdr Ehdr;
+  typedef typename ElfClass::Shdr Shdr;
+
+  assert(elf_base);
+  assert(section_start);
+  assert(section_size);
+
+  assert(my_strncmp(elf_base, ELFMAG, SELFMAG) == 0);
+
+  int name_len = my_strlen(section_name);
+
+  const Ehdr* elf_header = reinterpret_cast<const Ehdr*>(elf_base);
+  assert(elf_header->e_ident[EI_CLASS] == ElfClass::kClass);
+
+  const Shdr* sections =
+      reinterpret_cast<const Shdr*>(elf_base + elf_header->e_shoff);
+  const Shdr* string_section = sections + elf_header->e_shstrndx;
+
+  const Shdr* section = NULL;
+  for (int i = 0; i < elf_header->e_shnum; ++i) {
+    if (sections[i].sh_type == section_type) {
+      const char* current_section_name = (char*)(elf_base +
+                                                 string_section->sh_offset +
+                                                 sections[i].sh_name);
+      if (!my_strncmp(current_section_name, section_name, name_len)) {
+        section = &sections[i];
+        break;
+      }
+    }
+  }
+  if (section != NULL && section->sh_size > 0) {
+    *section_start = elf_base + section->sh_offset;
+    *section_size = section->sh_size;
+  }
+}
+
+}  // namespace
+
+bool FindElfSection(const void *elf_mapped_base,
+                    const char *section_name,
+                    uint32_t section_type,
+                    const void **section_start,
+                    int *section_size,
+                    int *elfclass) {
+  assert(elf_mapped_base);
+  assert(section_start);
+  assert(section_size);
+
+  *section_start = NULL;
+  *section_size = 0;
+
+  const char* elf_base =
+    static_cast<const char*>(elf_mapped_base);
+  const ElfW(Ehdr)* elf_header =
+    reinterpret_cast<const ElfW(Ehdr)*>(elf_base);
+  if (my_strncmp(elf_base, ELFMAG, SELFMAG) != 0)
+    return false;
+
+  if (elfclass) {
+    *elfclass = elf_header->e_ident[EI_CLASS];
+  }
+
+  if (elf_header->e_ident[EI_CLASS] == ELFCLASS32) {
+    FindElfClassSection<ElfClass32>(elf_base, section_name, section_type,
+                                    section_start, section_size);
+    return *section_start != NULL;
+  } else if (elf_header->e_ident[EI_CLASS] == ELFCLASS64) {
+    FindElfClassSection<ElfClass64>(elf_base, section_name, section_type,
+                                    section_start, section_size);
+    return *section_start != NULL;
+  }
+
+  return false;
+}
+
+}  // namespace google_breakpad