================
@@ -983,6 +1001,66 @@ llvm::Error
ProcessElfCore::ParseThreadContextsFromNoteSegment(
}
}
+bool ProcessElfCore::IsElf(lldb::addr_t address) {
+ uint8_t buf[4];
+ Status error;
+ size_t byte_read = ReadMemory(address, buf, 4, error);
+ if (byte_read != 4)
+ return false;
+ return elf::ELFHeader::MagicBytesMatch(buf);
+}
+
+std::optional<UUID> ProcessElfCore::FindNoteInCoreMemory(lldb::addr_t address,
+ uint32_t type) {
+ if (!IsElf(address))
+ return std::nullopt;
+ const uint32_t addr_size = GetAddressByteSize();
+ const size_t elf_header_size = addr_size == 4 ? sizeof(llvm::ELF::Elf32_Ehdr)
+ :
sizeof(llvm::ELF::Elf64_Ehdr);
+
+ unsigned char buf[4096];
+ Status error;
+ size_t byte_read = ReadMemory(address, buf, elf_header_size, error);
+ if (byte_read != elf_header_size)
+ return std::nullopt;
+ DataExtractor data(buf, 4096, GetByteOrder(), addr_size);
----------------
clayborg wrote:
It is ok to have a large buffer, but we should make sure the data extractor
points to just the data we have read for each place that we use it by
contructing new DataExtractor objects:
```
assert(sizeof(buf) >= elf_header_size);
DataExtractor header_data(buf, elf_header_size, GetByteOrder(), addr_size);
```
https://github.com/llvm/llvm-project/pull/92492
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