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| author | Vladimir Chtchetkine <vchtchetkine@google.com> | 2010-02-16 10:38:35 -0800 |
|---|---|---|
| committer | Vladimir Chtchetkine <vchtchetkine@google.com> | 2010-02-18 15:22:07 -0800 |
| commit | 5389aa19033153c09556d1362a8b8a56abccb8f5 (patch) | |
| tree | 5d731effe5bd5d2f162f06aadec7212045eaef3d /elff/elf_mapped_section.h | |
| parent | 76dbca0489ab98a46f2954bc7b77c3df6f9d8264 (diff) | |
| download | external_qemu-5389aa19033153c09556d1362a8b8a56abccb8f5.zip external_qemu-5389aa19033153c09556d1362a8b8a56abccb8f5.tar.gz external_qemu-5389aa19033153c09556d1362a8b8a56abccb8f5.tar.bz2 | |
Merge memory checking from sandbox
Change-id: Ibce845d0
Diffstat (limited to 'elff/elf_mapped_section.h')
| -rw-r--r-- | elff/elf_mapped_section.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/elff/elf_mapped_section.h b/elff/elf_mapped_section.h new file mode 100644 index 0000000..2f3ca56 --- /dev/null +++ b/elff/elf_mapped_section.h @@ -0,0 +1,88 @@ +/* Copyright (C) 2007-2010 The Android Open Source Project
+**
+** This software is licensed under the terms of the GNU General Public
+** License version 2, as published by the Free Software Foundation, and
+** may be copied, distributed, and modified under those terms.
+**
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+** GNU General Public License for more details.
+*/
+
+/*
+ * Contains declaration of a class ElfMappedSection, that encapsulates
+ * a section of an ELF file, mapped to memory.
+ */
+
+#ifndef ELFF_ELF_MAPPED_SECTION_H_
+#define ELFF_ELF_MAPPED_SECTION_H_
+
+#include "elf_defs.h"
+
+/* Encapsulates a section of an ELF file, mapped to memory. */
+class ElfMappedSection {
+ public:
+ /* Constructs ElfMappedSection instance. */
+ ElfMappedSection();
+
+ /* Destructs ElfMappedSection instance. */
+ ~ElfMappedSection();
+
+ /* Maps ELF file section to memory.
+ * Param:
+ * handle - Handle to an opened ELF file.
+ * offset - Offset of the beginning of the section data in ELF file.
+ * NOTE: we explicitly use 64-bit type for this parameter, since we may
+ * still allow 32-bit library to process 64 bits ELF/DWARF formats. We
+ * really only care about section size being small enough to fit in 32
+ * bits value in this case (which seems to be always true for ELF files,
+ * as section size is encoded with 32-bit value even in 64-bit ELF file).
+ * size - Section byte size in ELF file.
+ * Return:
+ * true on success, or false on failure, with errno providing extended
+ * error information.
+ * NOTE: if section has already been mapped, this method immediately
+ * returns with success.
+ */
+ bool map(ELF_FILE_HANDLE handle, Elf_Xword offset, Elf_Word size);
+
+ /* Checks if section has been mapped. */
+ bool is_mapped() const {
+ return mapped_at_ != NULL;
+ }
+
+ /* Gets address of the beginning of the mapped section. */
+ const void* data() const {
+ assert(is_mapped());
+ return data_;
+ }
+
+ /* Gets section size. */
+ Elf_Word size() const {
+ assert(is_mapped());
+ return size_;
+ }
+
+ /* Checks if an address range is fully contained in this section. */
+ bool is_contained(const void* ptr, size_t rsize) const {
+ assert(is_mapped());
+ return is_mapped() && is_in_section(ptr, rsize, data(), size());
+ }
+
+ protected:
+ /* Beginning of the memory mapping, containing the section.
+ * NOTE: due to page alignment requirements of the mapping API, mapping
+ * address may differ from the address where the actual section data
+ * starts inside that mapping.
+ */
+ void* mapped_at_;
+
+ /* Address of the beginning of the mapped section. */
+ const void* data_;
+
+ /* Section size. */
+ Elf_Word size_;
+};
+
+#endif // ELFF_ELF_MAPPED_SECTION_H_
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